/* roulang page: index */
:root {
            --color-primary-900: #0C2D26;
            --color-primary-700: #135244;
            --color-primary-500: #1C7A62;
            --color-primary-100: #DCEDE7;
            --color-coper-600: #9A5B2E;
            --color-coper-500: #B5733F;
            --color-coper-200: #E9D5C1;
            --color-bg: #F5F1E8;
            --color-surface: #FFFDF8;
            --color-ink: #1B2420;
            --color-gray-600: #5C665F;
            --color-line: #E4DED2;
            --shadow-subtle: 0 6px 20px rgba(12,45,38,0.06);
            --shadow-hover: 0 14px 34px rgba(12,45,38,0.12);
            --radius-card: 10px;
            --radius-block: 18px;
            --radius-pill: 999px;
            --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
            --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background: var(--color-bg);
            color: var(--color-ink);
            line-height: 1.85;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }

        a:hover {
            color: var(--color-primary-500);
        }

        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-card);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: clamp(16px, 4vw, 32px);
            padding-right: clamp(16px, 4vw, 32px);
        }

        .section {
            padding: clamp(64px, 8vw, 112px) 0;
        }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--color-coper-600);
            background: var(--color-coper-200);
            border-radius: var(--radius-pill);
            padding: 6px 18px;
            margin-bottom: 18px;
        }

        .section-title {
            font-family: var(--font-display);
            font-size: clamp(24px, 3.4vw, 32px);
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 12px;
            line-height: 1.35;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--color-gray-600);
            max-width: 680px;
            line-height: 1.7;
        }

        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-bg);
            border-bottom: 1px solid var(--color-line);
            transition: box-shadow 0.3s ease, background 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 8px 30px rgba(12, 45, 38, 0.08);
            background: rgba(245, 241, 232, 0.96);
            backdrop-filter: blur(8px);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 0 12px;
        }

        .site-logo {
            font-family: var(--font-display);
            font-size: 22px;
            font-weight: 700;
            color: var(--color-primary-900);
            line-height: 1.3;
            letter-spacing: 0.02em;
        }

        .site-logo:hover {
            color: var(--color-primary-500);
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            border: none;
            border-radius: var(--radius-pill);
            padding: 10px 24px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .btn-cta:hover {
            background: var(--color-coper-600);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(154, 91, 46, 0.25);
            color: #fff;
        }

        .btn-cta:active {
            transform: translateY(0);
            box-shadow: none;
        }

        /* Chip Nav */
        .chip-nav {
            display: flex;
            gap: 8px;
            padding-bottom: 14px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            white-space: nowrap;
        }

        .chip-nav::-webkit-scrollbar {
            display: none;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            height: 36px;
            padding: 0 20px;
            border-radius: var(--radius-pill);
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary-900);
            background: transparent;
            border: 1px solid var(--color-line);
            cursor: pointer;
            transition: all 0.25s ease;
            white-space: nowrap;
        }

        .chip:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }

        .chip.active {
            background: var(--color-primary-900);
            color: #fff;
            border-color: var(--color-primary-900);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 80px 0 72px;
            background: var(--color-bg);
        }

        .hero::before {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 55%;
            height: 100%;
            background: url('/assets/images/backpic/back-1.webp') no-repeat center center/cover;
            border-radius: 0 0 0 60px;
            opacity: 0.35;
            z-index: 0;
        }

        .hero .container {
            position: relative;
            z-index: 1;
        }

        .hero .row {
            align-items: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-primary-100);
            border-radius: var(--radius-pill);
            padding: 8px 20px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary-700);
            margin-bottom: 24px;
        }

        .hero-badge i {
            color: var(--color-coper-500);
        }

        .hero h1 {
            font-family: var(--font-display);
            font-size: clamp(36px, 5.4vw, 64px);
            font-weight: 800;
            color: var(--color-primary-900);
            line-height: 1.15;
            margin-bottom: 20px;
        }

        .hero-lead {
            font-size: 18px;
            color: var(--color-gray-600);
            line-height: 1.75;
            max-width: 540px;
            margin-bottom: 32px;
        }

        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 48px;
        }

        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-primary-900);
            color: #fff;
            border: 1px solid var(--color-primary-900);
            border-radius: 8px;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .btn-primary-custom:hover {
            background: var(--color-primary-700);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            color: #fff;
        }

        .btn-outline-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--color-primary-900);
            border: 1px solid var(--color-primary-900);
            border-radius: 8px;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .btn-outline-custom:hover {
            background: var(--color-primary-900);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 36px;
            border-top: 1px solid var(--color-line);
            padding-top: 28px;
        }

        .hero-stat-item .num {
            font-family: var(--font-display);
            font-size: 32px;
            font-weight: 700;
            color: var(--color-coper-500);
            line-height: 1.2;
        }

        .hero-stat-item .label {
            font-size: 14px;
            color: var(--color-gray-600);
        }

        .hero-img-wrap {
            border-radius: var(--radius-block);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            position: relative;
            margin-left: 12px;
        }

        .hero-img-wrap img {
            display: block;
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-block);
        }

        /* News Ticker */
        .ticker-bar {
            background: var(--color-primary-900);
            color: #fff;
            padding: 12px 0;
            overflow: hidden;
            position: relative;
        }

        .ticker-inner {
            display: flex;
            gap: 48px;
            animation: tickerMove 28s linear infinite;
            white-space: nowrap;
            font-size: 14px;
            padding-left: 24px;
        }

        .ticker-inner span {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            opacity: 0.9;
        }

        .ticker-inner i {
            color: var(--color-coper-500);
        }

        @keyframes tickerMove {
            0% { transform: translateX(0); }
            100% { transform: translateX(-50%); }
        }

        /* ===== Advantages ===== */
        .advantages {
            background: var(--color-surface);
            border-radius: var(--radius-block);
            padding: clamp(48px, 6vw, 80px);
        }

        .advantages .row {
            align-items: flex-start;
        }

        .advantages-left {
            padding-right: 40px;
        }

        .advantages-left .section-title {
            font-size: clamp(28px, 3.6vw, 36px);
            margin-bottom: 20px;
        }

        .advantages-left p {
            font-size: 16px;
            color: var(--color-gray-600);
            line-height: 1.75;
        }

        .advantage-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .advantage-item {
            display: flex;
            gap: 24px;
            padding: 28px 24px;
            border-radius: var(--radius-card);
            border: 1px solid transparent;
            transition: all 0.3s ease;
            margin-bottom: 12px;
            background: transparent;
        }

        .advantage-item:hover {
            background: var(--color-surface);
            border-color: var(--color-line);
            box-shadow: var(--shadow-subtle);
        }

        .advantage-num {
            font-family: var(--font-display);
            font-size: 42px;
            font-weight: 700;
            color: var(--color-coper-200);
            line-height: 1;
            min-width: 56px;
            text-align: center;
        }

        .advantage-body h3 {
            font-family: var(--font-display);
            font-size: 20px;
            font-weight: 600;
            color: var(--color-primary-900);
            margin-bottom: 6px;
        }

        .advantage-body p {
            font-size: 15px;
            color: var(--color-gray-600);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .advantage-icon {
            font-size: 20px;
            color: var(--color-coper-500);
            margin-top: 4px;
        }

        /* ===== Model Timeline ===== */
        .model-section {
            background: var(--color-bg);
        }

        .model-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .model-visual {
            position: relative;
            border-radius: var(--radius-block);
            overflow: hidden;
            min-height: 480px;
            box-shadow: var(--shadow-hover);
        }

        .model-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-block);
            display: block;
        }

        .model-visual::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 55%, rgba(12, 45, 38, 0.75) 100%);
            border-radius: var(--radius-block);
        }

        .model-visual-text {
            position: absolute;
            bottom: 32px;
            left: 32px;
            right: 32px;
            color: #fff;
            z-index: 1;
        }

        .model-visual-text h3 {
            font-family: var(--font-display);
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .model-visual-text p {
            font-size: 15px;
            opacity: 0.9;
        }

        .timeline {
            position: relative;
            padding-left: 32px;
            list-style: none;
            margin: 0;
        }

        .timeline::before {
            content: "";
            position: absolute;
            left: 8px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: var(--color-primary-100);
        }

        .timeline-step {
            position: relative;
            margin-bottom: 40px;
        }

        .timeline-step:last-child {
            margin-bottom: 0;
        }

        .timeline-step::before {
            content: "";
            position: absolute;
            left: -32px;
            top: 10px;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--color-coper-500);
            border: 3px solid var(--color-bg);
            box-shadow: 0 0 0 2px var(--color-coper-500);
        }

        .timeline-step .step-icon {
            font-size: 20px;
            color: var(--color-primary-500);
            margin-bottom: 8px;
        }

        .timeline-step h3 {
            font-family: var(--font-display);
            font-size: 20px;
            font-weight: 600;
            color: var(--color-primary-900);
            margin-bottom: 6px;
        }

        .timeline-step p {
            font-size: 15px;
            color: var(--color-gray-600);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== Achievement ===== */
        .achievement {
            background: var(--color-primary-900);
            border-radius: 0;
            padding: clamp(64px, 8vw, 96px) 0;
            position: relative;
            overflow: hidden;
        }

        .achievement::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(28, 122, 98, 0.2) 0%, transparent 70%);
            border-radius: 50%;
        }

        .achievement .section-title {
            color: #fff;
        }

        .achievement .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        .ach-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px 60px;
            margin-top: 48px;
        }

        .ach-item {
            border-left: 2px solid var(--color-primary-500);
            padding-left: 24px;
        }

        .ach-item .num {
            font-family: var(--font-display);
            font-size: clamp(36px, 4.4vw, 56px);
            font-weight: 800;
            color: var(--color-coper-500);
            line-height: 1.1;
            display: block;
        }

        .ach-item .label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.85);
            margin-top: 4px;
        }

        .ach-item .desc {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 4px;
            line-height: 1.6;
        }

        /* ===== About ===== */
        .about-section {
            background: var(--color-bg);
        }

        .about-inner {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 48px;
            align-items: center;
            background: var(--color-surface);
            border-radius: var(--radius-block);
            padding: clamp(32px, 5vw, 64px);
            border: 1px solid var(--color-line);
        }

        .about-img img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-hover);
        }

        .about-content .section-title {
            margin-bottom: 16px;
        }

        .about-content p {
            font-size: 16px;
            color: var(--color-gray-600);
            line-height: 1.85;
            margin-bottom: 16px;
        }

        .about-points {
            list-style: none;
            padding: 0;
            margin: 20px 0 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .about-points li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 15px;
            color: var(--color-primary-900);
            font-weight: 500;
        }

        .about-points i {
            color: var(--color-coper-500);
            font-size: 16px;
        }

        /* ===== Cooperation ===== */
        .cooperation {
            background: var(--color-bg);
            border-top: 1px solid var(--color-line);
        }

        .coop-cards {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            margin-top: 40px;
            align-items: stretch;
        }

        .coop-card {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: 40px 36px;
            position: relative;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-subtle);
        }

        .coop-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .coop-card.featured {
            border: 2px solid var(--color-coper-500);
        }

        .coop-badge {
            position: absolute;
            top: -14px;
            right: 28px;
            background: var(--color-coper-500);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            border-radius: var(--radius-pill);
            padding: 4px 18px;
            letter-spacing: 0.05em;
        }

        .coop-card h3 {
            font-family: var(--font-display);
            font-size: 24px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 10px;
        }

        .coop-card .coop-price {
            font-family: var(--font-display);
            font-size: 40px;
            font-weight: 800;
            color: var(--color-coper-500);
            line-height: 1.2;
            margin-bottom: 12px;
        }

        .coop-card .coop-price small {
            font-size: 16px;
            color: var(--color-gray-600);
            font-weight: 400;
        }

        .coop-card .coop-desc {
            font-size: 15px;
            color: var(--color-gray-600);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .coop-list {
            list-style: none;
            padding: 0;
            margin: 0 0 32px;
        }

        .coop-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--color-ink);
            margin-bottom: 10px;
        }

        .coop-list i {
            color: var(--color-primary-500);
            margin-top: 4px;
            font-size: 14px;
        }

        .coop-card .btn-coop {
            width: 100%;
            justify-content: center;
        }

        /* Form */
        .coop-form-wrap {
            margin-top: 56px;
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: clamp(28px, 4vw, 56px);
            box-shadow: var(--shadow-subtle);
        }

        .coop-form-wrap h3 {
            font-family: var(--font-display);
            font-size: 24px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 8px;
        }

        .coop-form-wrap .form-note {
            font-size: 14px;
            color: var(--color-gray-600);
            margin-bottom: 28px;
        }

        .form-label {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary-900);
            margin-bottom: 6px;
        }

        .form-control,
        .form-select {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: 8px;
            height: 46px;
            padding: 0 16px;
            font-size: 15px;
            color: var(--color-ink);
            transition: all 0.25s ease;
        }

        .form-control:focus,
        .form-select:focus {
            border-color: var(--color-primary-500);
            box-shadow: 0 0 0 4px rgba(28, 122, 98, 0.12);
            background: var(--color-surface);
            color: var(--color-ink);
        }

        textarea.form-control {
            min-height: 110px;
            padding: 12px 16px;
        }

        .btn-submit {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .btn-submit:hover {
            background: var(--color-coper-600);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(154, 91, 46, 0.25);
        }

        .form-check-input {
            border-color: var(--color-line);
            border-radius: 4px;
            width: 18px;
            height: 18px;
        }

        .form-check-input:checked {
            background-color: var(--color-primary-500);
            border-color: var(--color-primary-500);
        }

        .form-check-input:focus {
            box-shadow: 0 0 0 4px rgba(28, 122, 98, 0.12);
            border-color: var(--color-primary-500);
        }

        .form-error .form-control {
            border-color: var(--color-coper-600);
        }

        .form-error .error-msg {
            color: var(--color-coper-600);
            font-size: 13px;
            margin-top: 4px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-line);
            border-bottom: 1px solid var(--color-line);
        }

        .faq-wrapper {
            display: grid;
            grid-template-columns: 4fr 8fr;
            gap: 48px;
            align-items: flex-start;
        }

        .faq-left .section-title {
            margin-bottom: 16px;
        }

        .faq-left p {
            font-size: 16px;
            color: var(--color-gray-600);
            line-height: 1.7;
        }

        .accordion-item {
            background: var(--color-surface);
            border: 1px solid var(--color-line) !important;
            border-radius: 12px !important;
            margin-bottom: 16px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .accordion-item:has(.accordion-button:not(.collapsed)) {
            border-color: var(--color-primary-500) !important;
            background: rgba(220, 237, 231, 0.5);
        }

        .accordion-button {
            background: transparent;
            color: var(--color-primary-900);
            font-family: var(--font-display);
            font-size: 17px;
            font-weight: 600;
            padding: 20px 24px;
            border: none;
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .accordion-button::before {
            content: attr(data-num);
            font-family: var(--font-display);
            font-size: 15px;
            font-weight: 700;
            color: var(--color-coper-500);
            background: var(--color-coper-200);
            border-radius: 50%;
            width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .accordion-button::after {
            content: "\f067";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            background: none;
            width: auto;
            height: auto;
            margin-left: auto;
            color: var(--color-primary-500);
            font-size: 16px;
            transition: transform 0.3s ease;
        }

        .accordion-button:not(.collapsed)::after {
            content: "\f068";
            transform: none;
        }

        .accordion-button:not(.collapsed) {
            background: transparent;
            box-shadow: none;
            color: var(--color-primary-900);
        }

        .accordion-button:focus {
            box-shadow: none;
            border-color: var(--color-primary-500);
        }

        .accordion-body {
            padding: 0 24px 24px 68px;
            font-size: 15px;
            color: var(--color-gray-600);
            line-height: 1.7;
            background: transparent;
        }

        /* ===== News Feed ===== */
        .news-section {
            background: var(--color-bg);
        }

        .news-list {
            margin-top: 40px;
        }

        .news-item {
            display: flex;
            gap: 24px;
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            padding: 20px;
            margin-bottom: 20px;
            transition: all 0.3s ease;
            overflow: hidden;
        }

        .news-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
            border-color: var(--color-primary-100);
        }

        .news-thumb {
            width: 220px;
            min-width: 220px;
            border-radius: 8px;
            overflow: hidden;
        }

        .news-thumb img {
            width: 100%;
            height: 140px;
            object-fit: cover;
            border-radius: 8px;
            display: block;
        }

        .news-content {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .news-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 8px;
        }

        .news-tag {
            display: inline-block;
            background: var(--color-primary-100);
            color: var(--color-primary-700);
            font-size: 12px;
            font-weight: 600;
            border-radius: var(--radius-pill);
            padding: 3px 14px;
        }

        .news-date {
            font-size: 14px;
            color: var(--color-gray-600);
        }

        .news-content h3 {
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-content h3 a:hover {
            color: var(--color-primary-500);
        }

        .news-summary {
            font-size: 14px;
            color: var(--color-gray-600);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 8px;
        }

        .news-more {
            font-size: 14px;
            color: var(--color-primary-500);
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: auto;
        }

        .news-more:hover {
            color: var(--color-coper-500);
        }

        .news-more i {
            font-size: 13px;
        }

        /* Empty State */
        .empty-state {
            background: var(--color-surface);
            border: 2px dashed var(--color-line);
            border-radius: var(--radius-block);
            padding: 60px 40px;
            text-align: center;
            margin-top: 40px;
        }

        .empty-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--color-primary-100);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--color-primary-500);
            margin-bottom: 16px;
        }

        .empty-state h3 {
            font-family: var(--font-display);
            font-size: 20px;
            color: var(--color-primary-900);
            margin-bottom: 8px;
        }

        .empty-state p {
            font-size: 14px;
            color: var(--color-gray-600);
            margin-bottom: 0;
        }

        /* ===== CTA Banner ===== */
        .cta-banner {
            position: relative;
            padding: 80px 0;
            background: url('/assets/images/backpic/back-2.png') no-repeat center center/cover;
            text-align: center;
            color: #fff;
            overflow: hidden;
        }

        .cta-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: rgba(12, 45, 38, 0.82);
        }

        .cta-banner .container {
            position: relative;
            z-index: 1;
        }

        .cta-banner h2 {
            font-family: var(--font-display);
            font-size: clamp(26px, 3.6vw, 40px);
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-banner p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 32px;
        }

        .btn-cta-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            border: none;
            border-radius: 50px;
            padding: 14px 36px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .btn-cta-light:hover {
            background: var(--color-coper-600);
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(154, 91, 46, 0.35);
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-primary-900);
            color: rgba(255, 255, 255, 0.8);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 4fr 2fr 3fr 3fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand .site-logo {
            color: #fff;
            font-size: 22px;
            display: block;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
        }

        .footer-title {
            font-family: var(--font-display);
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: all 0.2s ease;
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 14px;
        }

        .footer-contact li i {
            color: var(--color-coper-500);
            margin-top: 4px;
            min-width: 16px;
        }

        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Floating CTA ===== */
        .float-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 999;
            background: var(--color-coper-500);
            color: #fff;
            border: none;
            border-radius: 50px;
            padding: 14px 28px;
            font-size: 15px;
            font-weight: 500;
            box-shadow: 0 10px 30px rgba(154, 91, 46, 0.3);
            cursor: pointer;
            transition: all 0.3s ease;
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .float-cta.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .float-cta:hover {
            background: var(--color-coper-600);
            transform: translateY(-3px);
            box-shadow: 0 16px 40px rgba(154, 91, 46, 0.4);
            color: #fff;
        }

        .float-cta i {
            font-size: 16px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 991.98px) {
            .hero {
                padding: 56px 0 48px;
            }

            .hero::before {
                width: 100%;
                opacity: 0.12;
                border-radius: 0;
            }

            .hero-img-wrap {
                margin-top: 40px;
            }

            .model-wrapper {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .model-visual {
                min-height: 320px;
            }

            .about-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .about-img img {
                height: 280px;
            }

            .coop-cards {
                grid-template-columns: 1fr;
            }

            .faq-wrapper {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .news-thumb {
                width: 160px;
                min-width: 160px;
            }

            .news-thumb img {
                height: 120px;
            }
        }

        @media (max-width: 767.98px) {
            .header-top {
                padding: 14px 0 10px;
            }

            .site-logo {
                font-size: 18px;
            }

            .btn-cta {
                padding: 8px 18px;
                font-size: 14px;
            }

            .hero {
                padding: 40px 0 36px;
            }

            .hero h1 {
                font-size: 36px;
            }

            .hero-stats {
                gap: 24px;
            }

            .hero-stat-item .num {
                font-size: 28px;
            }

            .advantages {
                padding: 32px 24px;
            }

            .advantages-left {
                padding-right: 0;
                margin-bottom: 32px;
            }

            .advantage-item {
                flex-direction: column;
                gap: 12px;
                padding: 20px 16px;
            }

            .advantage-num {
                font-size: 32px;
                text-align: left;
            }

            .about-points {
                grid-template-columns: 1fr;
            }

            .ach-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .coop-card {
                padding: 28px 22px;
            }

            .news-item {
                flex-direction: column;
                gap: 16px;
            }

            .news-thumb {
                width: 100%;
                min-width: 100%;
            }

            .news-thumb img {
                height: 180px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .float-cta {
                bottom: 16px;
                right: 16px;
                left: 16px;
                justify-content: center;
                border-radius: 50px;
                padding: 12px 20px;
            }

            .cta-banner {
                padding: 60px 0;
            }

            .btn-cta-light {
                width: 100%;
                justify-content: center;
            }

            .accordion-button {
                font-size: 15px;
                padding: 16px 16px;
            }

            .accordion-body {
                padding: 0 20px 20px 52px;
            }

            .coop-form-wrap {
                padding: 24px 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .site-logo {
                font-size: 16px;
            }

            .btn-cta {
                font-size: 13px;
                padding: 8px 14px;
            }

            .chip {
                height: 32px;
                padding: 0 16px;
                font-size: 13px;
            }

            .hero h1 {
                font-size: 32px;
            }

            .hero-lead {
                font-size: 16px;
            }

            .hero-btns .btn-primary-custom,
            .hero-btns .btn-outline-custom {
                width: 100%;
                justify-content: center;
            }

            .section-title {
                font-size: 24px;
            }

            .news-tag {
                font-size: 11px;
                padding: 2px 10px;
            }

            .news-date {
                font-size: 13px;
            }

            .footer-bottom {
                font-size: 12px;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary-900: #0C2D26;
            --color-primary-700: #135244;
            --color-primary-500: #1C7A62;
            --color-primary-100: #DCEDE7;
            --color-coper-600: #9A5B2E;
            --color-coper-500: #B5733F;
            --color-coper-200: #E9D5C1;
            --color-bg: #F5F1E8;
            --color-surface: #FFFDF8;
            --color-ink: #1B2420;
            --color-gray-600: #5C665F;
            --color-line: #E4DED2;
            --radius-card: 10px;
            --radius-block: 18px;
            --shadow-sm: 0 6px 20px rgba(12, 45, 38, 0.06);
            --shadow-md: 0 14px 34px rgba(12, 45, 38, 0.12);
            --transition: all 0.25s ease;
            --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-sans);
            font-size: 17px;
            line-height: 1.85;
            color: var(--color-ink);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            max-width: 1200px;
            padding-left: clamp(16px, 4vw, 32px);
            padding-right: clamp(16px, 4vw, 32px);
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 253, 248, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--color-line);
            box-shadow: 0 2px 12px rgba(12, 45, 38, 0.04);
        }

        .site-header.scrolled {
            box-shadow: 0 8px 24px rgba(12, 45, 38, 0.08);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 0;
            gap: 16px;
        }

        .site-logo {
            font-family: var(--font-serif);
            font-size: 22px;
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--color-primary-900);
            white-space: nowrap;
        }

        .site-logo:hover {
            color: var(--color-primary-700);
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 10px 22px;
            border-radius: 999px;
            box-shadow: 0 4px 14px rgba(181, 115, 63, 0.28);
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-cta:hover {
            background: var(--color-coper-600);
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(181, 115, 63, 0.32);
            color: #fff;
        }

        .btn-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(181, 115, 63, 0.3);
        }

        .chip-nav {
            display: flex;
            gap: 10px;
            padding: 0 0 14px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .chip-nav::-webkit-scrollbar {
            display: none;
        }

        .chip {
            flex: 0 0 auto;
            display: inline-flex;
            align-items: center;
            height: 36px;
            padding: 0 20px;
            border-radius: 999px;
            border: 1px solid var(--color-line);
            background: transparent;
            color: var(--color-primary-900);
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
            white-space: nowrap;
        }

        .chip:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }

        .chip.active {
            background: var(--color-primary-900);
            border-color: var(--color-primary-900);
            color: #fff;
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            background: linear-gradient(120deg, rgba(12, 45, 38, 0.92), rgba(19, 82, 68, 0.78)),
                url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
            padding: 72px 0 64px;
            color: #fff;
        }

        .page-hero .breadcrumb {
            margin-bottom: 20px;
            background: transparent;
            padding: 0;
        }

        .page-hero .breadcrumb-item,
        .page-hero .breadcrumb-item a {
            color: rgba(255, 255, 255, 0.72);
            font-size: 13px;
            transition: var(--transition);
        }

        .page-hero .breadcrumb-item a:hover {
            color: #fff;
        }

        .page-hero .breadcrumb-item.active {
            color: rgba(255, 255, 255, 0.95);
        }

        .page-hero .breadcrumb-item::before {
            color: rgba(255, 255, 255, 0.5);
        }

        .page-hero h1 {
            font-family: var(--font-serif);
            font-size: 44px;
            font-weight: 700;
            margin-bottom: 14px;
            color: #fff;
            letter-spacing: 0.03em;
        }

        .page-hero p {
            font-size: 17px;
            max-width: 640px;
            color: rgba(255, 255, 255, 0.9);
            line-height: 1.8;
            margin-bottom: 0;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.95);
            margin-bottom: 18px;
        }

        .hero-tag i {
            color: var(--color-coper-200);
        }

        /* ===== Section common ===== */
        section {
            padding: clamp(64px, 8vw, 112px) 0;
        }

        .section-heading {
            margin-bottom: 44px;
        }

        .section-heading .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-coper-600);
            letter-spacing: 0.08em;
            margin-bottom: 10px;
        }

        .section-heading h2 {
            font-family: var(--font-serif);
            font-size: 32px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin: 0;
            line-height: 1.4;
        }

        .section-heading p {
            color: var(--color-gray-600);
            max-width: 640px;
            margin-top: 12px;
            font-size: 16px;
        }

        /* ===== Intro section ===== */
        .intro-section {
            padding: clamp(40px, 5vw, 64px) 0 0;
        }

        .intro-card {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            box-shadow: var(--shadow-sm);
            padding: 40px;
            position: relative;
            overflow: hidden;
        }

        .intro-card::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--color-coper-500);
            border-radius: 4px;
        }

        .intro-card h2 {
            font-family: var(--font-serif);
            font-size: 24px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 16px;
        }

        .intro-card p {
            color: var(--color-ink);
            font-size: 16px;
            line-height: 1.9;
            margin-bottom: 0;
        }

        /* ===== Main content split ===== */
        .content-split {
            padding: clamp(56px, 7vw, 96px) 0;
        }

        .value-block {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            box-shadow: var(--shadow-sm);
            padding: 38px;
            margin-bottom: 32px;
        }

        .value-block .media-wrap {
            border-radius: 12px;
            overflow: hidden;
        }

        .value-block .media-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 260px;
        }

        .value-block h3 {
            font-family: var(--font-serif);
            font-size: 22px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 16px;
        }

        .numbered-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .numbered-list li {
            display: flex;
            gap: 18px;
            padding: 22px 0;
            border-bottom: 1px solid var(--color-line);
        }

        .numbered-list li:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .numbered-list .num {
            font-family: var(--font-serif);
            font-size: 40px;
            font-weight: 700;
            line-height: 1;
            color: var(--color-coper-500);
            min-width: 64px;
        }

        .numbered-list .num-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: var(--color-primary-100);
            color: var(--color-primary-700);
            font-size: 16px;
            margin-bottom: 10px;
        }

        .numbered-list .item-title {
            font-weight: 600;
            font-size: 17px;
            color: var(--color-ink);
            margin-bottom: 4px;
        }

        .numbered-list .item-text {
            font-size: 15px;
            color: var(--color-gray-600);
            line-height: 1.7;
        }

        /* Scene cards */
        .scene-block {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            box-shadow: var(--shadow-sm);
            padding: 38px;
            margin-bottom: 32px;
        }

        .scene-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 24px;
        }

        .scene-item {
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            padding: 24px;
            transition: var(--transition);
        }

        .scene-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--color-primary-500);
        }

        .scene-item .icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--color-primary-100);
            color: var(--color-primary-700);
            font-size: 18px;
            margin-bottom: 14px;
        }

        .scene-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: 8px;
        }

        .scene-item p {
            font-size: 14px;
            color: var(--color-gray-600);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* Timeline */
        .timeline-block {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            box-shadow: var(--shadow-sm);
            padding: 38px;
        }

        .timeline {
            position: relative;
            margin-top: 28px;
            padding-left: 30px;
        }

        .timeline::before {
            content: "";
            position: absolute;
            left: 10px;
            top: 6px;
            bottom: 6px;
            width: 2px;
            background: var(--color-primary-100);
        }

        .timeline-item {
            position: relative;
            padding-bottom: 30px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: "";
            position: absolute;
            left: -27px;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--color-coper-500);
            border: 3px solid var(--color-surface);
            box-shadow: 0 0 0 2px var(--color-coper-500);
        }

        .timeline-item .step-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-coper-600);
            letter-spacing: 0.06em;
            margin-bottom: 4px;
        }

        .timeline-item h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: 6px;
        }

        .timeline-item p {
            font-size: 14px;
            color: var(--color-gray-600);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== Sidebar ===== */
        .sidebar-card {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-sm);
            padding: 26px;
            margin-bottom: 24px;
        }

        .sidebar-title {
            font-family: var(--font-serif);
            font-size: 18px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 18px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--color-primary-100);
        }

        .sidebar-cats {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .cat-tag {
            display: inline-flex;
            align-items: center;
            height: 32px;
            padding: 0 14px;
            border-radius: 999px;
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            color: var(--color-primary-700);
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition);
        }

        .cat-tag:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }

        .cat-tag.current {
            background: var(--color-primary-900);
            border-color: var(--color-primary-900);
            color: #fff;
        }

        .recommend-item {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--color-line);
            transition: var(--transition);
        }

        .recommend-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .recommend-item:hover {
            transform: translateX(4px);
        }

        .recommend-item img {
            width: 76px;
            height: 60px;
            object-fit: cover;
            border-radius: 8px;
            flex-shrink: 0;
        }

        .recommend-item .rec-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-ink);
            line-height: 1.5;
            margin-bottom: 4px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .recommend-item .rec-meta {
            font-size: 12px;
            color: var(--color-gray-600);
        }

        /* ===== Info list ===== */
        .info-list-section {
            background: var(--color-bg);
        }

        .info-list {
            display: flex;
            flex-direction: column;
            gap: 22px;
        }

        .info-card {
            display: flex;
            gap: 24px;
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .info-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--color-primary-500);
        }

        .info-card .card-img {
            width: 220px;
            min-height: 150px;
            flex-shrink: 0;
        }

        .info-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .info-card .card-body {
            padding: 24px 26px 24px 0;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .info-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--color-gray-600);
            margin-bottom: 8px;
        }

        .info-card .card-tag {
            display: inline-flex;
            align-items: center;
            height: 26px;
            padding: 0 12px;
            border-radius: 999px;
            background: var(--color-primary-100);
            color: var(--color-primary-700);
            font-size: 12px;
            font-weight: 600;
        }

        .info-card h3 {
            font-family: var(--font-serif);
            font-size: 20px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .info-card p {
            font-size: 14px;
            color: var(--color-gray-600);
            line-height: 1.7;
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--color-surface);
        }

        .faq-wrap {
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: 38px;
        }

        .custom-accordion .accordion-item {
            border: 1px solid var(--color-line);
            border-radius: 12px;
            background: var(--color-surface);
            margin-bottom: 14px;
            overflow: hidden;
        }

        .custom-accordion .accordion-item:last-child {
            margin-bottom: 0;
        }

        .custom-accordion .accordion-button {
            background: var(--color-surface);
            color: var(--color-ink);
            font-weight: 600;
            font-size: 16px;
            padding: 18px 22px;
            border: none;
            box-shadow: none;
            transition: var(--transition);
        }

        .custom-accordion .accordion-button::after {
            content: "\f067";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 14px;
            background: none;
            width: auto;
            height: auto;
            color: var(--color-coper-500);
            transition: var(--transition);
        }

        .custom-accordion .accordion-button:not(.collapsed) {
            background: rgba(220, 237, 231, 0.55);
            color: var(--color-primary-900);
        }

        .custom-accordion .accordion-button:not(.collapsed)::after {
            content: "\f068";
            color: var(--color-primary-700);
        }

        .custom-accordion .accordion-button:focus {
            box-shadow: none;
            border-color: var(--color-primary-500);
        }

        .custom-accordion .accordion-body {
            padding: 6px 22px 20px;
            color: var(--color-gray-600);
            font-size: 15px;
            line-height: 1.8;
            border-top: 1px solid var(--color-line);
        }

        /* ===== CTA ===== */
        .cta-banner {
            background: linear-gradient(120deg, rgba(12, 45, 38, 0.94), rgba(19, 82, 68, 0.82)),
                url('/assets/images/backpic/back-2.png') center / cover no-repeat;
            color: #fff;
            text-align: center;
            padding: 64px 0;
        }

        .cta-banner h2 {
            font-family: var(--font-serif);
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 14px;
        }

        .cta-banner p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }

        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            height: 48px;
            padding: 0 32px;
            border-radius: 999px;
            border: none;
            transition: var(--transition);
            box-shadow: 0 6px 20px rgba(181, 115, 63, 0.35);
        }

        .btn-primary-custom:hover {
            background: var(--color-coper-600);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(181, 115, 63, 0.4);
        }

        .btn-primary-custom:active {
            transform: translateY(0);
            box-shadow: 0 3px 10px rgba(181, 115, 63, 0.35);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-primary-900);
            color: rgba(255, 255, 255, 0.78);
            padding: 56px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand .site-logo {
            color: #fff;
            font-size: 20px;
            margin-bottom: 12px;
            display: block;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.65);
            margin: 0;
        }

        .footer-title {
            font-family: var(--font-serif);
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-links,
        .footer-contact {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.72);
            font-size: 14px;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 6px;
        }

        .footer-contact li {
            font-size: 14px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: rgba(255, 255, 255, 0.72);
        }

        .footer-contact i {
            color: var(--color-coper-500);
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 0;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .page-hero {
                padding: 48px 0;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .section-heading h2 {
                font-size: 24px;
            }

            .scene-grid {
                grid-template-columns: 1fr;
            }

            .info-card {
                flex-direction: column;
            }

            .info-card .card-img {
                width: 100%;
                height: 140px;
            }

            .info-card .card-body {
                padding: 18px;
            }

            .numbered-list li {
                gap: 12px;
            }

            .numbered-list .num {
                font-size: 32px;
                min-width: 44px;
            }

            .intro-card {
                padding: 24px;
            }

            .value-block,
            .scene-block,
            .timeline-block {
                padding: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .header-top {
                padding: 14px 0;
            }

            .site-logo {
                font-size: 18px;
            }

            .btn-cta {
                font-size: 13px;
                padding: 8px 16px;
            }
        }

        @media (max-width: 520px) {
            body {
                font-size: 15px;
            }

            .btn-cta span {
                display: none;
            }

            .page-hero h1 {
                font-size: 26px;
            }

            .site-logo {
                font-size: 16px;
            }

            .faq-wrap {
                padding: 20px;
            }
        }

/* roulang page: article */
:root {
    --color-primary-900: #0C2D26;
    --color-primary-700: #135244;
    --color-primary-500: #1C7A62;
    --color-primary-100: #DCEDE7;
    --color-coper-600: #9A5B2E;
    --color-coper-500: #B5733F;
    --color-coper-200: #E9D5C1;
    --color-bg: #F5F1E8;
    --color-surface: #FFFDF8;
    --color-ink: #1B2420;
    --color-gray-600: #5C665F;
    --color-line: #E4DED2;
    --radius-card: 10px;
    --radius-lg: 18px;
    --radius-pill: 999px;
    --shadow-sm: 0 6px 20px rgba(12,45,38,0.06);
    --shadow-hover: 0 14px 34px rgba(12,45,38,0.12);
    --font-serif: "Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
    --font-sans: "PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    --space-section: clamp(64px, 8vw, 112px);
}
*, *::before, *::after { box-sizing: border-box; }
body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.85;
    color: var(--color-ink);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary-700); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--color-primary-500); }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-serif); }
.container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: clamp(16px, 4vw, 32px);
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,253,248,.96);
    border-bottom: 1px solid var(--color-line);
    transition: box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 8px 30px rgba(12,45,38,.08); }
.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 18px;
    flex-wrap: wrap;
}
.site-logo {
    font-family: var(--font-serif);
    font-size: clamp(20px, 2.4vw, 24px);
    font-weight: 700;
    color: var(--color-primary-900);
    letter-spacing: .5px;
    text-decoration: none;
    line-height: 1.3;
}
.site-logo:hover { color: var(--color-primary-700); }
.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-coper-500);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 22px;
    border-radius: var(--radius-pill);
    border: none;
    transition: all .25s ease;
    text-decoration: none;
    line-height: 1.4;
}
.btn-cta:hover {
    background: var(--color-coper-600);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(154,91,46,.28);
}
.chip-nav {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 12px;
    scrollbar-width: none;
}
.chip-nav::-webkit-scrollbar { display: none; }
.chip {
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
    color: var(--color-primary-900);
    background: transparent;
    border: 1px solid var(--color-line);
    padding: 9px 20px;
    border-radius: var(--radius-pill);
    transition: all .25s ease;
    text-decoration: none;
    display: inline-block;
}
.chip:hover {
    background: var(--color-primary-100);
    border-color: var(--color-primary-500);
    color: var(--color-primary-900);
}
.chip.active {
    background: var(--color-primary-900);
    border-color: var(--color-primary-900);
    color: #fff;
}
.btn { 
    display: inline-flex; 
    align-items: center; 
    justify-content: center; 
    gap: 8px; 
    height: 48px; 
    padding: 0 28px; 
    font-size: 15px; 
    font-weight: 600; 
    border-radius: 8px; 
    border: none; 
    cursor: pointer; 
    transition: all .25s ease; 
    text-decoration: none; 
    line-height: 1.2; 
}
.btn-primary { background: var(--color-primary-900); color: #fff; }
.btn-primary:hover { background: var(--color-primary-700); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-outline { background: transparent; color: var(--color-primary-900); border: 1px solid var(--color-primary-900); }
.btn-outline:hover { background: var(--color-primary-900); color: #fff; transform: translateY(-2px); }
.breadcrumb-wrap {
    background: var(--color-primary-100);
    border-bottom: 1px solid var(--color-line);
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 0;
    margin: 0;
    list-style: none;
    font-size: 14px;
    color: var(--color-gray-600);
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-primary-700); }
.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li + li::before { content: "/"; margin-right: 10px; color: var(--color-line); }
.breadcrumb li.active {
    color: var(--color-ink);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 320px;
}
.article-page { padding-block: clamp(48px, 6vw, 88px); }
.article-main { max-width: 860px; margin-inline: auto; }
.article-header { margin-bottom: 40px; text-align: center; }
.article-badge {
    display: inline-block;
    background: var(--color-primary-100);
    color: var(--color-primary-900);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    margin-bottom: 20px;
}
.article-title {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    line-height: 1.35;
    color: var(--color-ink);
    margin-bottom: 20px;
}
.article-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 14px;
    color: var(--color-gray-600);
}
.article-meta span { display: inline-flex; align-items: center; gap: 6px; }
.article-meta i { color: var(--color-coper-500); }
.article-content {
    font-size: 17px;
    line-height: 1.95;
    color: var(--color-ink);
    word-break: break-word;
}
.article-content h2, .article-content h3 {
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-primary-900);
    margin-top: 1.8em;
    margin-bottom: .7em;
}
.article-content h2 { font-size: 26px; }
.article-content h3 { font-size: 22px; }
.article-content p { margin-bottom: 1.6em; }
.article-content img { border-radius: var(--radius-card); margin: 1.8em auto; box-shadow: var(--shadow-sm); }
.article-content blockquote {
    border-left: 4px solid var(--color-coper-500);
    background: var(--color-coper-200);
    padding: 18px 24px;
    border-radius: 0 var(--radius-card) var(--radius-card) 0;
    margin: 1.8em 0;
    color: var(--color-primary-900);
    font-style: normal;
}
.article-content ul, .article-content ol { padding-left: 1.4em; margin-bottom: 1.6em; }
.article-content li { margin-bottom: 6px; }
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.8em 0;
    border-radius: var(--radius-card);
    overflow: hidden;
    display: block;
    overflow-x: auto;
}
.article-content th, .article-content td {
    border: 1px solid var(--color-line);
    padding: 12px 14px;
    text-align: left;
    background: var(--color-surface);
}
.article-content th { background: var(--color-primary-100); color: var(--color-primary-900); font-weight: 600; }
.article-content a { color: var(--color-coper-600); text-decoration: underline; }
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 40px;
    padding-top: 28px;
    border-top: 1px solid var(--color-line);
}
.tag-chip {
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-pill);
    font-size: 13px;
    color: var(--color-primary-900);
    padding: 6px 16px;
    transition: all .2s ease;
    display: inline-block;
}
.tag-chip:hover { background: var(--color-primary-100); border-color: var(--color-primary-500); color: var(--color-primary-900); }
.article-footer-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 40px;
    flex-wrap: wrap;
}
.related-section {
    background: var(--color-surface);
    border-top: 1px solid var(--color-line);
    padding-block: var(--space-section);
}
.related-header { text-align: center; margin-bottom: 40px; }
.related-header .section-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-coper-500);
    letter-spacing: 2px;
    text-transform: uppercase;
}
.related-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(26px, 3vw, 34px);
    font-weight: 700;
    color: var(--color-primary-900);
    margin-top: 8px;
}
.related-list {
    max-width: 860px;
    margin-inline: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.related-item {
    display: flex;
    align-items: stretch;
    background: var(--color-bg);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all .3s ease;
    text-decoration: none;
}
.related-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}
.related-item-img {
    flex: 0 0 220px;
    background-size: cover;
    background-position: center;
    background-color: var(--color-primary-100);
    min-height: 150px;
}
.related-item-body {
    padding: 22px 26px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    flex: 1;
}
.related-item-body .tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-coper-600);
    margin-bottom: 8px;
    letter-spacing: 1px;
}
.related-item-body h3 {
    font-family: var(--font-serif);
    font-size: 19px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 8px;
    line-height: 1.5;
}
.related-item-body p {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.75;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.cta-banner {
    background-image: linear-gradient(135deg, rgba(12,45,38,.94), rgba(19,82,68,.88)), url('/assets/images/backpic/back-1.webp');
    background-size: cover;
    background-position: center;
    color: #fff;
    text-align: center;
    padding-block: clamp(60px, 7vw, 90px);
}
.cta-banner h2 {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 38px);
    font-weight: 700;
    margin-bottom: 14px;
}
.cta-banner p {
    font-size: 16px;
    max-width: 560px;
    margin: 0 auto 30px;
    opacity: .9;
    line-height: 1.8;
}
.site-footer {
    background: var(--color-primary-900);
    color: rgba(255,255,255,.85);
    padding-top: 64px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
}
.footer-brand .site-logo { color: #fff; font-size: 20px; }
.footer-brand p {
    font-size: 14px;
    line-height: 1.75;
    margin-top: 16px;
    max-width: 300px;
    color: rgba(255,255,255,.7);
}
.footer-title {
    font-family: var(--font-serif);
    font-size: 16px;
    color: #fff;
    margin-bottom: 18px;
    font-weight: 600;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
    color: rgba(255,255,255,.75);
    font-size: 14px;
    transition: color .2s ease;
    text-decoration: none;
}
.footer-links a:hover { color: var(--color-coper-200); }
.footer-contact {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    margin-bottom: 12px;
    color: rgba(255,255,255,.75);
}
.footer-contact i { color: var(--color-coper-500); margin-top: 4px; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.12);
    padding-block: 20px;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,.6);
}
.footer-bottom p { margin: 0; }
.float-cta {
    position: fixed;
    right: 24px;
    bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--color-coper-500);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    padding: 14px 24px;
    border-radius: var(--radius-pill);
    box-shadow: 0 10px 30px rgba(154,91,46,.35);
    transition: all .3s ease;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
    text-decoration: none;
    border: none;
    line-height: 1.4;
}
.float-cta.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.float-cta:hover { background: var(--color-coper-600); color: #fff; transform: translateY(-2px); }
.empty-state {
    text-align: center;
    background: var(--color-surface);
    border: 2px dashed var(--color-line);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    max-width: 640px;
    margin-inline: auto;
}
.empty-state i { font-size: 48px; color: var(--color-coper-500); margin-bottom: 20px; }
.empty-state h2 { font-family: var(--font-serif); font-size: 26px; color: var(--color-ink); margin-bottom: 12px; }
.empty-state p { color: var(--color-gray-600); font-size: 15px; margin-bottom: 28px; line-height: 1.8; }
@media (max-width: 992px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .header-top { flex-direction: column; gap: 12px; padding-block: 14px; }
    .chip-nav { padding-bottom: 10px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .related-item { flex-direction: column; }
    .related-item-img { flex: none; min-height: 180px; width: 100%; }
    .related-item-body { padding: 18px 20px; }
    .article-meta { gap: 12px; font-size: 13px; }
    .breadcrumb li.active { max-width: 200px; }
    .float-cta { right: 16px; bottom: 16px; padding: 12px 20px; }
}
@media (max-width: 520px) {
    .btn { width: 100%; }
    .article-footer-nav { flex-direction: column; }
    .float-cta {
        left: 16px;
        right: 16px;
        justify-content: center;
        bottom: 12px;
        padding: 14px;
    }
    .article-page { padding-block: 32px; }
    .article-meta { flex-direction: column; align-items: center; gap: 6px; }
    .empty-state { padding: 40px 24px; }
}

/* roulang page: category2 */
:root {
            --color-primary-900: #0C2D26;
            --color-primary-700: #135244;
            --color-primary-500: #1C7A62;
            --color-primary-100: #DCEDE7;
            --color-coper-600: #9A5B2E;
            --color-coper-500: #B5733F;
            --color-coper-200: #E9D5C1;
            --color-bg: #F5F1E8;
            --color-surface: #FFFDF8;
            --color-ink: #1B2420;
            --color-gray-600: #5C665F;
            --color-line: #E4DED2;
            --radius-card: 10px;
            --radius-block: 18px;
            --radius-pill: 999px;
            --shadow-regular: 0 6px 20px rgba(12, 45, 38, 0.06);
            --shadow-hover: 0 14px 34px rgba(12, 45, 38, 0.12);
            --font-heading: "Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
            --font-body: "PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-body);
            background: var(--color-bg);
            color: var(--color-ink);
            font-size: 17px;
            line-height: 1.85;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
        }

        a {
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }

        .container {
            max-width: 1200px;
            padding-left: clamp(16px, 4vw, 32px);
            padding-right: clamp(16px, 4vw, 32px);
        }

        /* ========== Header / Nav ========== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-line);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(12, 45, 38, 0.04);
        }

        .site-header.scrolled {
            box-shadow: 0 8px 24px rgba(12, 45, 38, 0.08);
            background: rgba(255, 253, 248, 0.96);
            backdrop-filter: blur(8px);
            border-bottom-color: transparent;
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0 10px;
        }

        .site-logo {
            font-family: var(--font-heading);
            font-size: 22px;
            font-weight: 700;
            color: var(--color-primary-900);
            text-decoration: none;
            letter-spacing: 0.01em;
            line-height: 1.3;
            white-space: nowrap;
        }

        .site-logo:hover {
            color: var(--color-primary-700);
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            border-radius: var(--radius-pill);
            padding: 10px 24px;
            font-size: 14px;
            font-weight: 600;
            text-decoration: none;
            border: none;
            transition: background-color .2s, transform .2s, box-shadow .2s;
            box-shadow: 0 4px 12px rgba(181, 115, 63, 0.22);
            white-space: nowrap;
        }

        .btn-cta:hover {
            background: var(--color-coper-600);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(181, 115, 63, 0.3);
        }

        .btn-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(181, 115, 63, 0.2);
        }

        .chip-nav {
            display: flex;
            gap: 10px;
            padding: 4px 0 14px;
            overflow-x: auto;
            scrollbar-width: none;
            -webkit-overflow-scrolling: touch;
        }

        .chip-nav::-webkit-scrollbar {
            display: none;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 36px;
            padding: 0 20px;
            border-radius: var(--radius-pill);
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary-900);
            background: transparent;
            border: 1px solid var(--color-line);
            text-decoration: none;
            white-space: nowrap;
            transition: background-color .2s, color .2s, border-color .2s;
        }

        .chip:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }

        .chip.active {
            background: var(--color-primary-900);
            color: #fff;
            border-color: var(--color-primary-900);
        }

        /* ========== Category Hero ========== */
        .cat-hero {
            position: relative;
            padding: 76px 0 68px;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
            overflow: hidden;
        }

        .cat-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(12, 45, 38, 0.93) 0%, rgba(12, 45, 38, 0.78) 55%, rgba(12, 45, 38, 0.55) 100%);
        }

        .cat-hero::after {
            content: "";
            position: absolute;
            right: -80px;
            top: -100px;
            width: 360px;
            height: 360px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        .cat-hero .container {
            position: relative;
            z-index: 2;
        }

        .breadcrumb-custom {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.72);
            margin-bottom: 18px;
        }

        .breadcrumb-custom a {
            color: rgba(255, 255, 255, 0.82);
            text-decoration: none;
            transition: color 0.2s;
        }

        .breadcrumb-custom a:hover {
            color: #fff;
        }

        .breadcrumb-custom .sep {
            opacity: 0.55;
        }

        .cat-hero h1 {
            font-family: var(--font-heading);
            font-size: 44px;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
            margin: 0 0 10px;
            line-height: 1.3;
        }

        .cat-hero .hero-sub {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            margin: 0 0 8px;
            letter-spacing: 0.02em;
        }

        /* ========== Category Intro ========== */
        .cat-intro {
            padding: 48px 0 0;
        }

        .intro-card {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: 36px 42px;
            position: relative;
            box-shadow: var(--shadow-regular);
        }

        .intro-card::before {
            content: "";
            position: absolute;
            left: 0;
            top: 28px;
            bottom: 28px;
            width: 4px;
            border-radius: 2px;
            background: var(--color-coper-500);
        }

        .intro-card p {
            font-size: 16px;
            line-height: 1.85;
            color: var(--color-ink);
            margin: 0;
        }

        /* ========== Main Content Layout ========== */
        .cat-main-layout {
            padding: 56px 0 0;
        }

        .main-content {
            padding-right: 36px;
        }

        .study-layer {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: 40px;
            margin-bottom: 28px;
            box-shadow: var(--shadow-regular);
            position: relative;
        }

        .layer-label {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--color-coper-600);
            margin-bottom: 12px;
        }

        .layer-label .num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--color-coper-200);
            color: var(--color-coper-600);
            font-size: 13px;
            font-weight: 700;
        }

        .layer-title {
            font-family: var(--font-heading);
            font-size: 26px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 14px;
            line-height: 1.45;
        }

        .layer-desc {
            color: var(--color-gray-600);
            font-size: 16px;
            line-height: 1.85;
            margin: 0;
        }

        /* Focus grid */
        .focus-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 26px;
        }

        .focus-card {
            background: var(--color-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-line);
            padding: 24px;
            transition: transform .2s, box-shadow .2s;
        }

        .focus-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .focus-card .icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: var(--color-primary-100);
            color: var(--color-primary-700);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            margin-bottom: 14px;
        }

        .focus-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 6px;
            font-family: var(--font-heading);
        }

        .focus-card p {
            font-size: 14px;
            color: var(--color-gray-600);
            margin: 0;
            line-height: 1.7;
        }

        /* Timeline */
        .study-timeline {
            margin-top: 26px;
            position: relative;
            padding-left: 28px;
        }

        .study-timeline::before {
            content: "";
            position: absolute;
            left: 8px;
            top: 10px;
            bottom: 10px;
            width: 2px;
            background: var(--color-line);
        }

        .timeline-item {
            position: relative;
            padding: 0 0 30px 28px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: "";
            position: absolute;
            left: -27px;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--color-coper-500);
            border: 3px solid var(--color-surface);
            box-shadow: 0 0 0 2px var(--color-coper-500);
        }

        .timeline-item .step-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-coper-600);
            background: var(--color-coper-200);
            padding: 2px 12px;
            border-radius: var(--radius-pill);
            margin-bottom: 8px;
            letter-spacing: 0.04em;
        }

        .timeline-item h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 6px;
            font-family: var(--font-heading);
        }

        .timeline-item p {
            font-size: 14px;
            color: var(--color-gray-600);
            margin: 0;
            line-height: 1.7;
        }

        /* ========== Sidebar ========== */
        .sidebar {
            padding-left: 0;
        }

        .sidebar-block {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: 28px;
            margin-bottom: 28px;
            box-shadow: var(--shadow-regular);
        }

        .sidebar-title {
            font-family: var(--font-heading);
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin-bottom: 18px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--color-line);
            position: relative;
        }

        .sidebar-title::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 48px;
            height: 2px;
            background: var(--color-coper-500);
        }

        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .sidebar-tag {
            display: inline-flex;
            align-items: center;
            height: 34px;
            padding: 0 16px;
            border-radius: var(--radius-pill);
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            color: var(--color-primary-900);
            font-size: 13px;
            text-decoration: none;
            transition: background-color .2s, border-color .2s, transform .2s;
        }

        .sidebar-tag:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
            transform: translateY(-2px);
        }

        .sidebar-reading {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .sidebar-reading li {
            border-bottom: 1px solid var(--color-line);
            padding: 14px 0;
        }

        .sidebar-reading li:first-child {
            padding-top: 0;
        }

        .sidebar-reading li:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .sidebar-reading a {
            display: block;
            text-decoration: none;
            color: var(--color-ink);
            transition: color .2s;
            font-size: 15px;
            line-height: 1.6;
            font-weight: 500;
        }

        .sidebar-reading a:hover {
            color: var(--color-primary-500);
        }

        .sidebar-reading .meta {
            font-size: 12px;
            color: var(--color-gray-600);
            margin-top: 4px;
            display: block;
        }

        .mini-cta {
            background: var(--color-primary-900);
            border-radius: var(--radius-block);
            padding: 30px 28px;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .mini-cta::after {
            content: "";
            position: absolute;
            right: -40px;
            top: -40px;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .mini-cta h3 {
            font-family: var(--font-heading);
            font-size: 20px;
            margin-bottom: 10px;
            color: #fff;
        }

        .mini-cta p {
            font-size: 14px;
            opacity: 0.78;
            margin-bottom: 18px;
            line-height: 1.7;
        }

        .mini-cta .btn-solid {
            background: var(--color-coper-500);
            border: none;
            color: #fff;
            border-radius: var(--radius-pill);
            padding: 10px 24px;
            font-size: 14px;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: background-color .2s, transform .2s, box-shadow .2s;
        }

        .mini-cta .btn-solid:hover {
            background: var(--color-coper-600);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
            color: #fff;
        }

        /* ========== Highlight Stats ========== */
        .cat-highlight {
            margin-top: 64px;
            background: var(--color-primary-900);
            border-radius: var(--radius-block);
            color: #fff;
            padding: 56px 48px;
            position: relative;
            overflow: hidden;
        }

        .cat-highlight::after {
            content: "";
            position: absolute;
            right: -100px;
            bottom: -100px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.07);
        }

        .highlight-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 1;
        }

        .highlight-item {
            text-align: center;
            padding: 0 12px;
        }

        .highlight-item .num {
            font-family: var(--font-heading);
            font-size: 42px;
            font-weight: 700;
            color: var(--color-coper-200);
            line-height: 1.2;
            display: block;
        }

        .highlight-item .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.85);
            margin-top: 10px;
            font-weight: 500;
            display: block;
        }

        .highlight-item .note {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 6px;
            display: block;
            line-height: 1.6;
        }

        /* ========== Resource Cards ========== */
        .cat-resources {
            padding: 64px 0 0;
        }

        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .section-head h2 {
            font-family: var(--font-heading);
            font-size: 32px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin: 0;
            line-height: 1.3;
        }

        .section-head .sub {
            color: var(--color-gray-600);
            font-size: 15px;
            margin: 0;
        }

        .resource-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .resource-card {
            display: flex;
            gap: 20px;
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            padding: 20px;
            transition: transform .2s, box-shadow .2s;
            box-shadow: var(--shadow-regular);
        }

        .resource-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .resource-card .img-wrap {
            flex: 0 0 130px;
            width: 130px;
            height: 104px;
            border-radius: 8px;
            overflow: hidden;
            background: var(--color-primary-100);
        }

        .resource-card .img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        .resource-body {
            flex: 1;
            min-width: 0;
        }

        .resource-body .badge {
            background: var(--color-primary-100);
            color: var(--color-primary-900);
            font-size: 12px;
            font-weight: 600;
            border-radius: var(--radius-pill);
            padding: 4px 12px;
            display: inline-block;
        }

        .resource-body .res-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            text-decoration: none;
            line-height: 1.5;
            display: block;
            margin: 10px 0 6px;
            transition: color 0.2s;
        }

        .resource-body .res-title:hover {
            color: var(--color-primary-500);
        }

        .resource-body .res-summary {
            font-size: 13px;
            color: var(--color-gray-600);
            margin: 0;
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ========== CTA ========== */
        .cat-cta {
            margin: 64px 0 80px;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-block);
            padding: 64px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cat-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(12, 45, 38, 0.94), rgba(19, 82, 68, 0.88));
            border-radius: var(--radius-block);
        }

        .cat-cta > * {
            position: relative;
            z-index: 1;
        }

        .cat-cta h2 {
            font-family: var(--font-heading);
            font-size: 30px;
            color: #fff;
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .cat-cta p {
            font-size: 16px;
            opacity: 0.85;
            margin-bottom: 26px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .cat-cta .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-coper-500);
            color: #fff;
            border-radius: var(--radius-pill);
            padding: 14px 36px;
            font-size: 15px;
            font-weight: 600;
            text-decoration: none;
            transition: background-color .2s, transform .2s, box-shadow .2s;
            box-shadow: 0 4px 16px rgba(181, 115, 63, 0.3);
            border: none;
        }

        .cat-cta .btn-cta-primary:hover {
            background: var(--color-coper-600);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(181, 115, 63, 0.4);
            color: #fff;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--color-primary-900);
            color: rgba(255, 255, 255, 0.8);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 48px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand .site-logo {
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            font-family: var(--font-heading);
            display: inline-block;
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            opacity: 0.7;
            margin: 0;
            max-width: 280px;
        }

        .footer-title {
            color: #fff;
            font-family: var(--font-heading);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-title::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 28px;
            height: 2px;
            background: var(--color-coper-500);
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            font-size: 14px;
            transition: color .2s, padding-left .2s;
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-contact li {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-contact i {
            color: var(--color-coper-500);
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-bottom p {
            margin: 0;
        }

        /* ========== Responsive ========== */
        @media (max-width: 1199.98px) {
            .resource-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 991.98px) {
            .main-content {
                padding-right: 0;
            }

            .sidebar {
                padding-left: 0;
                margin-top: 8px;
            }

            .highlight-grid {
                grid-template-columns: repeat(2, 1fr);
                row-gap: 36px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }

            .cat-hero {
                padding: 60px 0 52px;
            }

            .cat-hero h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 767.98px) {
            body {
                font-size: 16px;
            }

            .header-top {
                padding: 12px 0 8px;
            }

            .site-logo {
                font-size: 18px;
            }

            .btn-cta {
                padding: 8px 18px;
                font-size: 13px;
            }

            .cat-hero {
                padding: 48px 0 40px;
            }

            .cat-hero h1 {
                font-size: 30px;
            }

            .cat-hero .hero-sub {
                font-size: 15px;
            }

            .intro-card {
                padding: 28px 24px;
            }

            .cat-main-layout {
                padding-top: 40px;
            }

            .study-layer {
                padding: 28px 24px;
            }

            .layer-title {
                font-size: 22px;
            }

            .focus-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .cat-highlight {
                padding: 44px 24px;
                margin-top: 48px;
            }

            .highlight-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px 16px;
            }

            .highlight-item .num {
                font-size: 34px;
            }

            .section-head h2 {
                font-size: 26px;
            }

            .resource-grid {
                grid-template-columns: 1fr;
            }

            .resource-card {
                flex-direction: column;
            }

            .resource-card .img-wrap {
                width: 100%;
                height: 180px;
                flex: 0 0 auto;
            }

            .cat-cta {
                padding: 48px 24px;
                margin-bottom: 56px;
            }

            .cat-cta h2 {
                font-size: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                padding: 20px 0;
            }
        }

        @media (max-width: 520px) {
            .btn-cta {
                padding: 8px 14px;
                font-size: 12px;
                gap: 4px;
            }

            .btn-cta i {
                display: none;
            }

            .highlight-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .resource-card .img-wrap {
                height: 140px;
            }
        }

/* roulang page: category3 */
:root {
            --color-primary-900: #0C2D26;
            --color-primary-700: #135244;
            --color-primary-500: #1C7A62;
            --color-primary-100: #DCEDE7;
            --color-coper-600: #9A5B2E;
            --color-coper-500: #B5733F;
            --color-coper-200: #E9D5C1;
            --color-bg: #F5F1E8;
            --color-surface: #FFFDF8;
            --color-ink: #1B2420;
            --color-gray-600: #5C665F;
            --color-line: #E4DED2;
            --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --radius-card: 10px;
            --radius-lg: 18px;
            --shadow-sm: 0 6px 20px rgba(12, 45, 38, 0.06);
            --shadow-hover: 0 14px 34px rgba(12, 45, 38, 0.12);
            --space-section: clamp(64px, 8vw, 112px);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-sans);
            background: var(--color-bg);
            color: var(--color-ink);
            font-size: 17px;
            line-height: 1.85;
        }

        img {
            max-width: 100%;
            height: auto;
        }

        a {
            color: var(--color-primary-700);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        a:hover {
            color: var(--color-primary-500);
        }

        a:focus-visible,
        button:focus-visible,
        .btn:focus-visible {
            outline: 3px solid rgba(28, 122, 98, 0.4);
            outline-offset: 2px;
        }

        .container {
            max-width: 1200px;
            padding-left: clamp(16px, 4vw, 32px);
            padding-right: clamp(16px, 4vw, 32px);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 48px;
            padding: 0 28px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 500;
            border: 1px solid transparent;
            transition: all 0.2s ease;
            cursor: pointer;
            text-decoration: none;
        }

        .btn-primary-solid {
            background: var(--color-primary-900);
            color: #fff;
        }

        .btn-primary-solid:hover {
            background: var(--color-primary-700);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .btn-outline-solid {
            background: transparent;
            border-color: var(--color-primary-900);
            color: var(--color-primary-900);
        }

        .btn-outline-solid:hover {
            background: var(--color-primary-900);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .btn-outline-light-solid {
            background: transparent;
            border-color: rgba(245, 241, 232, 0.78);
            color: #F5F1E8;
        }

        .btn-outline-light-solid:hover {
            background: rgba(245, 241, 232, 0.12);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-coper {
            background: var(--color-coper-600);
            color: #fff;
        }

        .btn-coper:hover {
            background: var(--color-coper-500);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .btn:active {
            transform: translateY(0);
            box-shadow: none;
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 253, 248, 0.92);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--color-line);
            transition: box-shadow 0.25s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 8px 24px rgba(12, 45, 38, 0.08);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0 10px;
        }

        .site-logo {
            font-family: var(--font-serif);
            font-size: 22px;
            font-weight: 700;
            color: var(--color-primary-900);
            line-height: 1.3;
            text-decoration: none;
            white-space: nowrap;
        }

        .site-logo:hover {
            color: var(--color-primary-700);
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 42px;
            padding: 0 22px;
            background: var(--color-coper-600);
            color: #fff;
            border-radius: 999px;
            border: none;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s ease;
            text-decoration: none;
            white-space: nowrap;
        }

        .btn-cta:hover {
            background: var(--color-coper-500);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .chip-nav {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 6px 0 14px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .chip-nav::-webkit-scrollbar {
            display: none;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 36px;
            padding: 0 20px;
            border-radius: 999px;
            border: 1px solid var(--color-line);
            background: transparent;
            color: var(--color-primary-900);
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            white-space: nowrap;
            transition: all 0.2s ease;
        }

        .chip:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }

        .chip.active {
            background: var(--color-primary-900);
            border-color: transparent;
            color: #fff;
        }

        .chip.active:hover {
            background: var(--color-primary-900);
            color: #fff;
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            background: linear-gradient(120deg, rgba(12, 45, 38, 0.94), rgba(19, 82, 68, 0.78)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            padding: clamp(56px, 8vw, 96px) 0;
            color: #F5F1E8;
        }

        .page-banner .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            padding: 0;
            margin: 0 0 20px;
            list-style: none;
            background: transparent;
        }

        .page-banner .breadcrumb-item a {
            color: rgba(245, 241, 232, 0.78);
            text-decoration: none;
        }

        .page-banner .breadcrumb-item a:hover {
            color: #fff;
        }

        .page-banner .breadcrumb-item.active {
            color: var(--color-coper-200);
        }

        .page-banner .breadcrumb-item + .breadcrumb-item::before {
            content: "/";
            color: rgba(245, 241, 232, 0.5);
            padding: 0 8px;
        }

        .page-banner h1 {
            margin: 0 0 14px;
            font-family: var(--font-serif);
            font-size: clamp(30px, 4vw, 50px);
            font-weight: 700;
            letter-spacing: 0.02em;
            color: #fff;
        }

        .banner-subtitle {
            max-width: 660px;
            margin: 0;
            font-size: 18px;
            line-height: 1.8;
            color: rgba(245, 241, 232, 0.9);
        }

        /* ===== Intro ===== */
        .intro-section {
            padding-top: var(--space-section);
            padding-bottom: 0;
        }

        .intro-card {
            position: relative;
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-lg);
            padding: clamp(24px, 3vw, 36px);
            box-shadow: var(--shadow-sm);
        }

        .intro-card::before {
            content: "";
            position: absolute;
            left: 0;
            top: 24px;
            bottom: 24px;
            width: 4px;
            border-radius: 0 4px 4px 0;
            background: var(--color-coper-500);
        }

        .intro-card p {
            margin: 0;
            font-size: 17px;
            color: var(--color-ink);
            text-align: justify;
        }

        /* ===== Main content ===== */
        .main-content-section {
            padding: var(--space-section) 0;
        }

        .content-card {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: clamp(24px, 3vw, 36px);
            margin-bottom: 28px;
        }

        .content-card h2 {
            font-family: var(--font-serif);
            font-size: 26px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin: 0 0 8px;
        }

        .content-card .card-lead {
            margin: 0 0 24px;
            color: var(--color-gray-600);
            font-size: 16px;
        }

        .content-card h3 {
            font-family: var(--font-serif);
            font-size: 18px;
            font-weight: 600;
            color: var(--color-primary-900);
            margin: 0 0 6px;
        }

        /* Num list */
        .num-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .num-list li {
            display: flex;
            gap: 18px;
            padding: 18px 0;
            border-bottom: 1px solid var(--color-line);
        }

        .num-list li:last-child {
            border-bottom: none;
        }

        .num-list-icon {
            flex: 0 0 48px;
            width: 48px;
            height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: rgba(220, 237, 231, 0.6);
            color: var(--color-primary-700);
            font-size: 20px;
        }

        .num-list li p {
            margin: 0;
            color: var(--color-gray-600);
            font-size: 15px;
        }

        /* Feature image */
        .feature-image {
            border-radius: 12px;
            overflow: hidden;
            margin: 20px 0;
        }

        .feature-image img {
            width: 100%;
            height: 260px;
            object-fit: cover;
            display: block;
        }

        .content-card > p {
            color: var(--color-gray-600);
            margin: 0 0 12px;
        }

        /* Mini card */
        .mini-card {
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            border-radius: 12px;
            padding: 20px;
            height: 100%;
            transition: all 0.2s ease;
        }

        .mini-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .mini-card i {
            color: var(--color-coper-600);
            font-size: 22px;
            margin-bottom: 12px;
        }

        .mini-card h4 {
            font-family: var(--font-serif);
            font-size: 18px;
            font-weight: 600;
            color: var(--color-primary-900);
            margin: 0 0 8px;
        }

        .mini-card p {
            margin: 0;
            color: var(--color-gray-600);
            font-size: 14px;
            line-height: 1.7;
        }

        /* FAQ */
        .accordion.custom-faq {
            --bs-accordion-border-color: var(--color-line);
            --bs-accordion-bg: var(--color-surface);
            --bs-accordion-btn-focus-border-color: var(--color-primary-500);
            --bs-accordion-btn-focus-box-shadow: 0 0 0 0.22rem rgba(28, 122, 98, 0.14);
        }

        .accordion.custom-faq .accordion-item {
            border: 1px solid var(--color-line);
            border-radius: 12px;
            margin-bottom: 12px;
            overflow: hidden;
            background: var(--color-surface);
        }

        .accordion.custom-faq .accordion-button {
            font-family: var(--font-serif);
            font-size: 18px;
            font-weight: 600;
            color: var(--color-ink);
            background: var(--color-surface);
            padding: 16px 20px;
            box-shadow: none;
        }

        .accordion.custom-faq .accordion-button:hover {
            background: rgba(220, 237, 231, 0.35);
        }

        .accordion.custom-faq .accordion-button:not(.collapsed) {
            background: rgba(220, 237, 231, 0.5);
            color: var(--color-primary-900);
        }

        .accordion.custom-faq .accordion-button::after {
            content: "\f067";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            background-image: none;
            width: auto;
            height: auto;
            color: var(--color-coper-600);
            transform: none;
        }

        .accordion.custom-faq .accordion-button:not(.collapsed)::after {
            content: "\f068";
        }

        .accordion.custom-faq .accordion-body {
            color: var(--color-gray-600);
            font-size: 15px;
            line-height: 1.8;
            padding: 4px 20px 20px;
        }

        /* ===== Sidebar ===== */
        .sidebar-widget {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 24px;
            margin-bottom: 24px;
        }

        .sidebar-widget h3 {
            font-family: var(--font-serif);
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin: 0 0 16px;
        }

        .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            height: 32px;
            padding: 0 16px;
            border-radius: 999px;
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            color: var(--color-primary-900);
            font-size: 13px;
            font-weight: 500;
            text-decoration: none;
            transition: all 0.2s ease;
        }

        .tag-chip:hover {
            background: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }

        .tag-chip.active {
            background: var(--color-primary-900);
            color: #fff;
            border-color: transparent;
        }

        .recommend-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 10px 0;
            border-bottom: 1px solid var(--color-line);
            text-decoration: none;
            transition: all 0.2s ease;
        }

        .recommend-item:last-child {
            border-bottom: none;
        }

        .recommend-item:hover {
            transform: translateX(4px);
        }

        .recommend-item img {
            width: 68px;
            height: 52px;
            object-fit: cover;
            border-radius: 8px;
            flex-shrink: 0;
        }

        .recommend-item span {
            font-size: 14px;
            line-height: 1.6;
            color: var(--color-ink);
            font-weight: 500;
        }

        .recommend-item:hover span {
            color: var(--color-primary-700);
        }

        /* Timeline */
        .timeline {
            position: relative;
            padding-left: 26px;
            border-left: 2px solid var(--color-primary-100);
        }

        .timeline-item {
            position: relative;
            padding-bottom: 22px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: "";
            position: absolute;
            left: -32px;
            top: 5px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--color-coper-500);
            border: 3px solid var(--color-surface);
            box-shadow: 0 0 0 2px var(--color-coper-200);
        }

        .timeline-item .time {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-coper-600);
            margin-bottom: 4px;
            letter-spacing: 0.02em;
        }

        .timeline-item p {
            margin: 0;
            font-size: 14px;
            color: var(--color-gray-600);
            line-height: 1.7;
        }

        /* ===== Info list ===== */
        .info-section {
            padding: 0 0 var(--space-section);
        }

        .section-head {
            margin-bottom: 28px;
        }

        .section-head h2 {
            font-family: var(--font-serif);
            font-size: 30px;
            font-weight: 700;
            color: var(--color-primary-900);
            margin: 0 0 6px;
        }

        .section-head p {
            margin: 0;
            color: var(--color-gray-600);
            font-size: 16px;
        }

        .info-list-item {
            display: flex;
            align-items: center;
            gap: 22px;
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: 12px;
            padding: 18px;
            margin-bottom: 16px;
            transition: all 0.2s ease;
        }

        .info-list-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .info-list-thumb {
            width: 190px;
            height: 120px;
            object-fit: cover;
            border-radius: 10px;
            flex-shrink: 0;
        }

        .info-list-body {
            flex: 1;
        }

        .info-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 6px;
        }

        .info-date {
            font-size: 13px;
            color: var(--color-gray-600);
        }

        .info-list-body h3 {
            font-family: var(--font-serif);
            font-size: 19px;
            font-weight: 600;
            color: var(--color-primary-900);
            margin: 0 0 6px;
        }

        .info-list-body p {
            margin: 0 0 8px;
            color: var(--color-gray-600);
            font-size: 15px;
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .text-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary-700);
            text-decoration: none;
        }

        .text-link:hover {
            color: var(--color-coper-600);
        }

        .text-link i {
            font-size: 12px;
            transition: transform 0.2s ease;
        }

        .text-link:hover i {
            transform: translateX(3px);
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            background: linear-gradient(115deg, rgba(12, 45, 38, 0.94), rgba(19, 82, 68, 0.82)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            padding: clamp(64px, 8vw, 96px) 0;
            text-align: center;
            color: #F5F1E8;
        }

        .cta-section h2 {
            font-family: var(--font-serif);
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 700;
            margin: 0 0 12px;
            color: #fff;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(245, 241, 232, 0.85);
            margin: 0 0 32px;
        }

        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-primary-900);
            color: rgba(245, 241, 232, 0.88);
            padding: 64px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr;
            gap: 40px;
            padding-bottom: 44px;
            border-bottom: 1px solid rgba(245, 241, 232, 0.14);
        }

        .footer-brand .site-logo {
            color: #fff;
            font-size: 22px;
            display: inline-block;
            margin-bottom: 14px;
        }

        .footer-brand p {
            margin: 0;
            font-size: 15px;
            line-height: 1.8;
            color: rgba(245, 241, 232, 0.7);
            max-width: 360px;
        }

        .footer-title {
            font-family: var(--font-serif);
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 16px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(245, 241, 232, 0.72);
            font-size: 14px;
            text-decoration: none;
            transition: color 0.2s ease, padding-left 0.2s ease;
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            color: rgba(245, 241, 232, 0.72);
            font-size: 14px;
            margin-bottom: 10px;
        }

        .footer-contact i {
            color: var(--color-coper-500);
            width: 16px;
        }

        .footer-bottom {
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
        }

        .footer-bottom p {
            margin: 0;
            color: rgba(245, 241, 232, 0.55);
            font-size: 13px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .sidebar-widget {
                margin-top: 8px;
            }
        }

        @media (max-width: 768px) {
            .header-top {
                padding: 10px 0 8px;
            }

            .site-logo {
                font-size: 18px;
            }

            .btn-cta {
                height: 36px;
                padding: 0 14px;
                font-size: 13px;
            }

            .chip {
                height: 34px;
                padding: 0 16px;
                font-size: 13px;
            }

            .page-banner {
                padding: 44px 0 56px;
            }

            .page-banner h1 {
                font-size: 30px;
            }

            .banner-subtitle {
                font-size: 15px;
            }

            .intro-card {
                padding: 22px;
            }

            .content-card {
                padding: 20px;
            }

            .content-card h2 {
                font-size: 22px;
            }

            .content-card h3 {
                font-size: 16px;
            }

            .feature-image img {
                height: 190px;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .info-list-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 14px;
            }

            .info-list-thumb {
                width: 100%;
                height: 170px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .cta-actions .btn {
                width: 100%;
            }
        }

        @media (max-width: 520px) {
            .site-logo {
                font-size: 16px;
            }

            .btn-cta {
                padding: 0 10px;
                font-size: 12px;
                gap: 4px;
            }

            .btn-cta i {
                display: none;
            }

            .chip {
                padding: 0 12px;
                font-size: 12px;
                height: 32px;
            }

            .page-banner h1 {
                font-size: 26px;
            }

            .info-list-body h3 {
                font-size: 16px;
            }

            .info-list-body p {
                font-size: 14px;
            }
        }

/* roulang page: category4 */
:root {
            --color-primary-900: #0C2D26;
            --color-primary-700: #135244;
            --color-primary-500: #1C7A62;
            --color-primary-100: #DCEDE7;
            --color-coper-600: #9A5B2E;
            --color-coper-500: #B5733F;
            --color-coper-200: #E9D5C1;
            --color-bg: #F5F1E8;
            --color-surface: #FFFDF8;
            --color-ink: #1B2420;
            --color-gray-600: #5C665F;
            --color-line: #E4DED2;
            --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --radius-card: 10px;
            --radius-block: 18px;
            --shadow-normal: 0 6px 20px rgba(12,45,38,0.06);
            --shadow-hover: 0 14px 34px rgba(12,45,38,0.12);
            --section-gap: clamp(64px, 8vw, 112px);
            --inner-gap: clamp(32px, 4vw, 56px);
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--color-ink);
            font-size: 17px;
            line-height: 1.85;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--color-primary-700);
            text-decoration: none;
            transition: color .2s ease, background-color .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease;
        }
        a:hover {
            color: var(--color-primary-500);
            text-decoration: none;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        p {
            margin-bottom: 1rem;
        }
        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-serif);
            color: var(--color-primary-900);
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: .5em;
        }
        .container {
            max-width: 1200px;
            padding-left: clamp(16px, 4vw, 32px);
            padding-right: clamp(16px, 4vw, 32px);
        }
        .site-header {
            background-color: var(--color-surface);
            border-bottom: 1px solid var(--color-line);
            position: sticky;
            top: 0;
            z-index: 1030;
            transition: box-shadow .3s ease, background-color .3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 8px 28px rgba(12,45,38,0.10);
            background-color: rgba(255, 253, 248, 0.96);
            backdrop-filter: blur(6px);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0 10px;
            gap: 16px;
            flex-wrap: wrap;
        }
        .site-logo {
            font-family: var(--font-serif);
            font-size: 22px;
            font-weight: 800;
            color: var(--color-primary-900);
            letter-spacing: .02em;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .site-logo:hover {
            color: var(--color-primary-700);
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--color-coper-500);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 10px 22px;
            border-radius: 999px;
            border: 1px solid transparent;
            transition: all .25s ease;
            white-space: nowrap;
        }
        .btn-cta:hover {
            background-color: var(--color-coper-600);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(154, 91, 46, 0.28);
        }
        .btn-cta:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(154, 91, 46, 0.2);
        }
        .chip-nav {
            display: flex;
            gap: 8px;
            padding: 4px 0 14px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            flex-wrap: nowrap;
        }
        .chip-nav::-webkit-scrollbar {
            display: none;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 36px;
            padding: 0 20px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary-900);
            background: transparent;
            border: 1px solid var(--color-line);
            white-space: nowrap;
            transition: all .22s ease;
        }
        .chip:hover {
            background-color: var(--color-primary-100);
            border-color: var(--color-primary-500);
            color: var(--color-primary-900);
        }
        .chip.active {
            background-color: var(--color-primary-900);
            color: #fff;
            border-color: var(--color-primary-900);
        }
        .site-footer {
            background-color: var(--color-primary-900);
            color: rgba(245, 241, 232, 0.85);
            padding: 60px 0 0;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 44px;
        }
        .footer-brand .site-logo {
            color: #fff;
            font-size: 20px;
            margin-bottom: 14px;
            display: block;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            opacity: 0.75;
            margin-bottom: 0;
        }
        .footer-title {
            color: #fff;
            font-size: 15px;
            font-family: var(--font-sans);
            letter-spacing: .06em;
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 24px;
            height: 2px;
            background-color: var(--color-coper-500);
        }
        .footer-links,
        .footer-contact {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links a {
            color: rgba(245, 241, 232, 0.75);
            font-size: 14px;
            transition: color .2s ease, padding-left .2s ease;
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-contact li {
            margin-bottom: 10px;
            font-size: 14px;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }
        .footer-contact i {
            color: var(--color-coper-500);
            margin-top: 4px;
            font-size: 13px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(245, 241, 232, 0.15);
            padding: 18px 0;
            text-align: center;
            font-size: 13px;
            opacity: 0.65;
        }
        .footer-bottom p {
            margin-bottom: 0;
        }

        /* ===== Category Page Styles ===== */
        .cat-banner {
            position: relative;
            background: linear-gradient(135deg, var(--color-primary-900) 40%, var(--color-primary-700) 100%);
            padding: clamp(48px, 7vw, 84px) 0;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
        }
        .cat-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(108deg, rgba(12, 45, 38, 0.96) 20%, rgba(12, 45, 38, 0.82) 55%, rgba(12, 45, 38, 0.55) 100%);
        }
        .cat-banner .container {
            position: relative;
            z-index: 2;
        }
        .cat-banner .breadcrumb {
            background: transparent;
            padding: 0;
            margin-bottom: 16px;
            --bs-breadcrumb-divider: '/';
        }
        .cat-banner .breadcrumb a {
            color: rgba(245, 241, 232, 0.7);
            font-size: 14px;
        }
        .cat-banner .breadcrumb a:hover {
            color: #fff;
        }
        .cat-banner .breadcrumb-item.active {
            color: var(--color-coper-200);
            font-size: 14px;
        }
        .cat-banner h1 {
            font-size: clamp(30px, 5vw, 46px);
            color: #fff;
            margin-bottom: 12px;
        }
        .cat-banner p.lead {
            color: rgba(255, 253, 248, 0.8);
            font-size: 16px;
            line-height: 1.75;
            max-width: 640px;
            margin-bottom: 0;
        }
        .cat-banner .banner-meta {
            display: flex;
            gap: 16px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .cat-banner .banner-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 999px;
            padding: 4px 14px;
            font-size: 13px;
            color: var(--color-coper-200);
        }
        .cat-main {
            padding: clamp(48px, 7vw, 80px) 0 var(--section-gap);
        }
        .cat-content-grid {
            display: grid;
            grid-template-columns: 1fr 360px;
            gap: clamp(28px, 4vw, 48px);
            align-items: start;
        }
        .cat-main-content {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: clamp(24px, 4vw, 40px);
            box-shadow: var(--shadow-normal);
        }
        .media-intro {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-bottom: 32px;
        }
        .media-intro-text p {
            font-size: 15px;
            line-height: 1.85;
            color: var(--color-gray-600);
            margin-bottom: 12px;
        }
        .media-intro-image {
            border-radius: var(--radius-card);
            overflow: hidden;
            min-height: 220px;
            background-color: var(--color-primary-100);
        }
        .media-intro-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform .5s ease;
        }
        .media-intro-image:hover img {
            transform: scale(1.03);
        }
        .section-title-block {
            display: flex;
            align-items: center;
            gap: 12px;
            margin: 32px 0 20px;
        }
        .section-title-block .icon-box {
            width: 36px;
            height: 36px;
            background: var(--color-primary-900);
            color: var(--color-coper-200);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            font-size: 16px;
        }
        .section-title-block h2 {
            font-size: 22px;
            margin-bottom: 0;
        }
        .media-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-bottom: 8px;
        }
        .media-card {
            background: var(--color-bg);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            padding: 20px;
            transition: box-shadow .3s ease, transform .3s ease, border-color .3s ease;
            display: flex;
            flex-direction: column;
        }
        .media-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: var(--color-primary-500);
        }
        .media-card-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
            margin-bottom: 12px;
        }
        .badge-tag {
            display: inline-block;
            font-size: 12px;
            line-height: 1;
            padding: 6px 14px;
            border-radius: 999px;
            background: var(--color-primary-100);
            color: var(--color-primary-900);
            font-weight: 500;
            letter-spacing: .02em;
        }
        .badge-tag.coper {
            background: var(--color-coper-200);
            color: var(--color-coper-600);
        }
        .media-card .date {
            font-size: 13px;
            color: var(--color-gray-600);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .media-card h3 {
            font-size: 18px;
            line-height: 1.5;
            margin-bottom: 8px;
        }
        .media-card h3 a {
            color: var(--color-ink);
        }
        .media-card h3 a:hover {
            color: var(--color-primary-700);
        }
        .media-card p.desc {
            font-size: 14px;
            line-height: 1.75;
            color: var(--color-gray-600);
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .media-card .card-footer-link {
            font-size: 14px;
            color: var(--color-coper-600);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .media-card .card-footer-link:hover {
            color: var(--color-coper-500);
            gap: 10px;
        }

        /* Sidebar */
        .cat-sidebar {
            position: sticky;
            top: 100px;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .side-card {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-block);
            padding: 24px;
            box-shadow: var(--shadow-normal);
        }
        .side-card .side-title {
            font-size: 18px;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--color-primary-100);
        }
        .side-card .side-title::before {
            content: "";
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 36px;
            height: 2px;
            background: var(--color-coper-500);
            z-index: 1;
        }
        .category-chip-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .category-chip-list .chip {
            font-size: 13px;
            height: 32px;
            padding: 0 14px;
            background: var(--color-bg);
        }
        .category-chip-list .chip.active {
            background: var(--color-primary-900);
            color: #fff;
        }
        .recommend-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .recommend-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid var(--color-line);
        }
        .recommend-list li:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }
        .recommend-list .thumb {
            width: 56px;
            height: 56px;
            min-width: 56px;
            border-radius: 8px;
            overflow: hidden;
            background-color: var(--color-primary-100);
        }
        .recommend-list .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .recommend-list .rec-text {
            font-size: 13px;
            line-height: 1.5;
        }
        .recommend-list .rec-text a {
            color: var(--color-ink);
            display: block;
            margin-bottom: 4px;
        }
        .recommend-list .rec-text a:hover {
            color: var(--color-primary-700);
        }
        .recommend-list .rec-text span {
            font-size: 12px;
            color: var(--color-gray-600);
        }
        .side-contact {
            background: var(--color-primary-900);
            border: none;
            color: #fff;
        }
        .side-contact .side-title {
            color: #fff;
            border-bottom-color: rgba(255,255,255,0.15);
        }
        .side-contact .side-title::before {
            background: var(--color-coper-500);
        }
        .side-contact p {
            font-size: 14px;
            line-height: 1.75;
            color: rgba(255,255,255,0.7);
            margin-bottom: 16px;
        }
        .side-contact .btn-outline-light {
            border-radius: 8px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 500;
            border-color: var(--color-coper-500);
            color: var(--color-coper-200);
            width: 100%;
        }
        .side-contact .btn-outline-light:hover {
            background-color: var(--color-coper-500);
            color: #fff;
            border-color: var(--color-coper-500);
        }

        /* Pinstriped list */
        .pinstripe-list {
            border-top: 1px solid var(--color-line);
        }
        .pinstripe-item {
            display: flex;
            gap: 18px;
            padding: 18px 0;
            border-bottom: 1px solid var(--color-line);
            transition: background-color .2s ease;
        }
        .pinstripe-item:hover {
            background-color: rgba(220, 237, 231, 0.35);
        }
        .pinstripe-date {
            font-size: 13px;
            color: var(--color-gray-600);
            min-width: 90px;
            display: flex;
            align-items: flex-start;
            gap: 4px;
            padding-top: 2px;
        }
        .pinstripe-content {
            flex: 1;
        }
        .pinstripe-content h3 {
            font-size: 17px;
            margin-bottom: 6px;
            line-height: 1.5;
        }
        .pinstripe-content p {
            font-size: 14px;
            color: var(--color-gray-600);
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* FAQ Section */
        .faq-section {
            padding: 0 0 var(--section-gap);
        }
        .faq-grid {
            display: grid;
            grid-template-columns: 0.9fr 1.4fr;
            gap: clamp(28px, 4vw, 48px);
            align-items: start;
        }
        .faq-heading h2 {
            font-size: clamp(26px, 3vw, 32px);
            margin-bottom: 14px;
        }
        .faq-heading p {
            font-size: 15px;
            color: var(--color-gray-600);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-line);
            border-radius: 12px;
            overflow: hidden;
            transition: box-shadow .3s ease, border-color .3s ease;
        }
        .faq-item.active {
            border-color: var(--color-primary-500);
            box-shadow: var(--shadow-normal);
        }
        .faq-q {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 16px 20px;
            cursor: pointer;
            min-height: 56px;
            user-select: none;
        }
        .faq-q .num {
            font-family: var(--font-serif);
            font-size: 14px;
            color: var(--color-coper-500);
            font-weight: 700;
        }
        .faq-q .q-text {
            flex: 1;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
        }
        .faq-q .icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--color-primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform .3s ease, background-color .3s ease;
            color: var(--color-primary-900);
            font-size: 12px;
            flex-shrink: 0;
        }
        .faq-item.active .icon {
            transform: rotate(45deg);
            background: var(--color-primary-900);
            color: #fff;
        }
        .faq-a {
            display: none;
            padding: 0 20px 18px 52px;
            font-size: 14px;
            line-height: 1.8;
            color: var(--color-gray-600);
        }
        .faq-item.active .faq-a {
            display: block;
        }

        /* CTA */
        .cat-cta {
            padding: 0 0 var(--section-gap);
        }
        .cta-banner {
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-block);
            padding: clamp(40px, 6vw, 64px);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 28px;
            flex-wrap: wrap;
            position: relative;
            overflow: hidden;
        }
        .cta-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(110deg, rgba(12, 45, 38, 0.94), rgba(12, 45, 38, 0.72));
            border-radius: var(--radius-block);
        }
        .cta-banner .cta-content,
        .cta-banner .cta-btn-wrap {
            position: relative;
            z-index: 2;
        }
        .cta-content h2 {
            color: #fff;
            font-size: clamp(22px, 3vw, 30px);
            margin-bottom: 8px;
        }
        .cta-content p {
            color: rgba(255,255,255,0.75);
            font-size: 15px;
            margin-bottom: 0;
        }
        .btn-solid-coper {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--color-coper-500);
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 600;
            transition: all .25s ease;
            white-space: nowrap;
        }
        .btn-solid-coper:hover {
            background-color: var(--color-coper-600);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(154, 91, 46, 0.3);
        }

        /* Floating CTA */
        .float-cta {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 1050;
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--color-primary-900);
            color: var(--color-coper-200);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 999px;
            padding: 12px 24px;
            font-size: 14px;
            font-weight: 600;
            box-shadow: 0 12px 32px rgba(12,45,38,0.35);
            opacity: 0;
            pointer-events: none;
            transition: opacity .3s ease, transform .3s ease;
            transform: translateY(16px);
            text-decoration: none;
        }
        .float-cta.show {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .float-cta:hover {
            transform: translateY(-3px);
            background: var(--color-primary-700);
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .cat-content-grid {
                grid-template-columns: 1fr;
            }
            .cat-sidebar {
                position: static;
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            body {
                font-size: 15px;
            }
            .header-top {
                padding-top: 12px;
            }
            .site-logo {
                font-size: 18px;
            }
            .btn-cta {
                font-size: 13px;
                padding: 8px 16px;
            }
            .media-intro {
                grid-template-columns: 1fr;
            }
            .media-grid {
                grid-template-columns: 1fr;
            }
            .cat-content-grid {
                grid-template-columns: 1fr;
            }
            .cat-main {
                padding: 36px 0 60px;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .cta-banner {
                flex-direction: column;
                align-items: flex-start;
            }
            .float-cta {
                left: 16px;
                right: 16px;
                bottom: 16px;
                justify-content: center;
                border-radius: 12px;
                padding: 14px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                padding-bottom: 28px;
            }
        }
        @media (max-width: 520px) {
            .cat-sidebar {
                grid-template-columns: 1fr;
            }
            .cat-banner {
                padding: 36px 0 44px;
            }
            .cat-main-content {
                padding: 20px;
            }
            .cat-banner .banner-meta {
                gap: 8px;
            }
            .cat-banner .banner-meta span {
                font-size: 12px;
                padding: 3px 10px;
            }
            .pinstripe-item {
                flex-direction: column;
                gap: 6px;
            }
            .media-card {
                padding: 16px;
            }
        }