/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a3e;
            --primary-light: #2a2a5e;
            --primary-dark: #0f0f2a;
            --accent: #d4a757;
            --accent-light: #e8c87a;
            --accent-dark: #b8883a;
            --accent-ruby: #e94560;
            --bg-light: #f8f9fc;
            --bg-white: #ffffff;
            --text-dark: #1a1a3e;
            --text-muted: #6c757d;
            --text-light: #f8f9fa;
            --border-color: #e9ecef;
            --border-radius: 12px;
            --border-radius-sm: 8px;
            --border-radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(26, 26, 62, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 26, 62, 0.10);
            --shadow-lg: 0 20px 60px rgba(26, 26, 62, 0.14);
            --shadow-accent: 0 8px 30px rgba(212, 167, 87, 0.30);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--bg-light);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
            border-radius: 4px;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Typography ===== */
        .heading-xl {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .heading-lg {
            font-size: 2.4rem;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
        }
        .heading-md {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.3;
        }
        .heading-sm {
            font-size: 1.25rem;
            font-weight: 600;
            line-height: 1.4;
        }
        .body-lg {
            font-size: 1.125rem;
            line-height: 1.7;
        }
        .body-md {
            font-size: 1rem;
            line-height: 1.7;
        }
        .body-sm {
            font-size: 0.875rem;
            line-height: 1.6;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-muted {
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .heading-xl {
                font-size: 2.2rem;
            }
            .heading-lg {
                font-size: 1.8rem;
            }
            .heading-md {
                font-size: 1.4rem;
            }
        }

        /* ===== Section Spacing ===== */
        .section {
            padding: 80px 0;
        }
        .section-sm {
            padding: 48px 0;
        }
        .section-lg {
            padding: 120px 0;
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-lg {
                padding: 72px 0;
            }
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title .subtitle {
            display: inline-block;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 8px;
            background: rgba(212, 167, 87, 0.12);
            padding: 4px 16px;
            border-radius: 20px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 32px;
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
            border-radius: 50px;
            border: 2px solid transparent;
            transition: var(--transition);
            cursor: pointer;
            text-align: center;
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
            box-shadow: var(--shadow-accent);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            color: var(--primary-dark);
            border-color: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(212, 167, 87, 0.40);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-accent);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-light);
            border-color: rgba(255, 255, 255, 0.35);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.10);
            color: var(--text-light);
            border-color: rgba(255, 255, 255, 0.60);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-dark {
            background: var(--primary);
            color: var(--text-light);
            border-color: var(--primary);
        }
        .btn-dark:hover {
            background: var(--primary-light);
            color: var(--text-light);
            border-color: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.1rem;
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.875rem;
        }

        /* ===== Badge / Tag ===== */
        .badge-custom {
            display: inline-block;
            padding: 4px 14px;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 20px;
            background: rgba(212, 167, 87, 0.12);
            color: var(--accent-dark);
            border: 1px solid rgba(212, 167, 87, 0.20);
        }
        .badge-ruby {
            background: rgba(233, 69, 96, 0.10);
            color: var(--accent-ruby);
            border-color: rgba(233, 69, 96, 0.20);
        }
        .badge-primary {
            background: rgba(26, 26, 62, 0.08);
            color: var(--primary);
            border-color: rgba(26, 26, 62, 0.12);
        }

        /* ===== Card Base ===== */
        .card-custom {
            background: var(--bg-white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            overflow: hidden;
        }
        .card-custom:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-custom .card-body {
            padding: 28px;
        }
        .card-custom .card-img-top {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }

        /* ===== Navigation ===== */
        .navbar-main {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: var(--primary-dark);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            z-index: 1050;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.20);
        }
        .navbar-main .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: -0.02em;
            transition: var(--transition);
        }
        .navbar-brand:hover {
            color: var(--accent);
        }
        .navbar-brand .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--accent);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-dark);
            font-size: 1.2rem;
            font-weight: 800;
        }
        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .navbar-nav .nav-item {
            display: inline-flex;
        }
        .navbar-nav .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.70);
            border-radius: 50px;
            transition: var(--transition);
            background: transparent;
            border: 1px solid transparent;
        }
        .navbar-nav .nav-link:hover {
            color: var(--text-light);
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.10);
        }
        .navbar-nav .nav-link.active {
            color: var(--primary-dark);
            background: var(--accent);
            border-color: var(--accent);
            font-weight: 600;
        }
        .navbar-nav .nav-link.active:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            color: var(--primary-dark);
        }
        .navbar-cta {
            margin-left: 16px;
        }
        .navbar-cta .btn {
            padding: 8px 24px;
            font-size: 0.9rem;
        }
        .navbar-toggler {
            display: none;
            background: none;
            border: none;
            color: var(--text-light);
            font-size: 1.5rem;
            padding: 4px 8px;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
        }
        .navbar-toggler:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .navbar-toggler:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
        }

        @media (max-width: 768px) {
            .navbar-toggler {
                display: block;
            }
            .navbar-collapse {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                background: var(--primary-dark);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                padding: 16px 24px;
                flex-direction: column;
                gap: 8px;
                box-shadow: var(--shadow-lg);
            }
            .navbar-collapse.show {
                display: flex;
            }
            .navbar-nav {
                flex-direction: column;
                gap: 4px;
                width: 100%;
            }
            .navbar-nav .nav-link {
                width: 100%;
                justify-content: flex-start;
                padding: 12px 20px;
            }
            .navbar-cta {
                margin-left: 0;
                margin-top: 8px;
                width: 100%;
            }
            .navbar-cta .btn {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 88vh;
            display: flex;
            align-items: center;
            background: var(--primary-dark);
            overflow: hidden;
            margin-top: var(--nav-height);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 26, 62, 0.85) 0%, rgba(15, 15, 42, 0.70) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 720px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent);
            background: rgba(212, 167, 87, 0.15);
            border: 1px solid rgba(212, 167, 87, 0.25);
            border-radius: 50px;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .hero-title {
            font-size: 3.6rem;
            font-weight: 800;
            color: var(--text-light);
            line-height: 1.15;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
        }
        .hero-title .highlight {
            color: var(--accent);
        }
        .hero-desc {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 600px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .hero-stat {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
        }
        .hero-stat-item {
            text-align: left;
        }
        .hero-stat-item .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .hero-stat-item .label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            font-weight: 500;
        }

        @media (max-width: 768px) {
            .hero {
                min-height: 70vh;
                padding: 60px 0;
            }
            .hero-title {
                font-size: 2.4rem;
            }
            .hero-desc {
                font-size: 1rem;
            }
            .hero-stat {
                gap: 24px;
                flex-wrap: wrap;
            }
            .hero-stat-item .num {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.9rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== Features Section ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--border-radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
            border-color: rgba(212, 167, 87, 0.20);
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: rgba(212, 167, 87, 0.10);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--accent);
            transition: var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--accent);
            color: var(--primary-dark);
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-dark);
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
        }

        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Service Categories ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .category-card {
            background: var(--bg-white);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .category-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
        }
        .category-card .cat-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }
        .category-card .cat-body {
            padding: 24px 24px 28px;
        }
        .category-card .cat-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .category-card .cat-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .category-card .cat-body .cat-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        @media (max-width: 768px) {
            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .categories-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== News / CMS List ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .news-card {
            display: flex;
            background: var(--bg-white);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .news-card .news-thumb {
            width: 200px;
            min-height: 160px;
            flex-shrink: 0;
            object-fit: cover;
            border-right: 1px solid var(--border-color);
        }
        .news-card .news-body {
            padding: 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .news-card .news-body .news-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-card .news-body .news-meta .badge-custom {
            font-size: 0.7rem;
            padding: 2px 12px;
        }
        .news-card .news-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
            line-height: 1.4;
        }
        .news-card .news-body h3 a {
            color: inherit;
        }
        .news-card .news-body h3 a:hover {
            color: var(--accent);
        }
        .news-card .news-body p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
            background: var(--bg-white);
            border-radius: var(--border-radius);
            border: 1px dashed var(--border-color);
        }
        .news-empty i {
            font-size: 2.4rem;
            color: var(--border-color);
            margin-bottom: 12px;
        }

        @media (max-width: 768px) {
            .news-grid {
                grid-template-columns: 1fr;
            }
            .news-card {
                flex-direction: column;
            }
            .news-card .news-thumb {
                width: 100%;
                height: 180px;
                border-right: none;
                border-bottom: 1px solid var(--border-color);
            }
        }

        /* ===== Stats Section ===== */
        .stats-section {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.10;
            z-index: 0;
        }
        .stats-grid {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item .stat-num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.60);
            font-weight: 500;
            margin-top: 4px;
        }
        .stat-item .stat-icon {
            font-size: 2rem;
            color: rgba(212, 167, 87, 0.25);
            margin-bottom: 12px;
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stat-item .stat-num {
                font-size: 2rem;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }

        /* ===== Process / Flow ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .process-step {
            text-align: center;
            background: var(--bg-white);
            border-radius: var(--border-radius);
            padding: 32px 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .process-step:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            background: var(--accent);
            color: var(--primary-dark);
            font-size: 1.2rem;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .process-step h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .process-step p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.5;
        }
        .process-connector {
            display: none;
        }

        @media (max-width: 768px) {
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 520px) {
            .process-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--border-radius-sm);
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(212, 167, 87, 0.20);
        }
        .faq-question {
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question .faq-icon {
            font-size: 1.2rem;
            color: var(--accent);
            transition: var(--transition);
        }
        .faq-question[aria-expanded="true"] .faq-icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.show {
            display: block;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 680px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .cta-content p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 32px;
        }
        .cta-content .btn {
            font-size: 1.1rem;
            padding: 16px 44px;
        }

        @media (max-width: 768px) {
            .cta-content h2 {
                font-size: 1.8rem;
            }
            .cta-content p {
                font-size: 1rem;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .navbar-brand {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.50);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.50);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.40);
            margin-bottom: 0;
        }
        .footer-bottom .social-links {
            display: flex;
            gap: 16px;
        }
        .footer-bottom .social-links a {
            color: rgba(255, 255, 255, 0.40);
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .footer-bottom .social-links a:hover {
            color: var(--accent);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        /* ===== Utility ===== */
        .bg-alt {
            background: var(--bg-white);
        }
        .bg-light-custom {
            background: var(--bg-light);
        }
        .divider {
            width: 60px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
            margin: 20px auto 0;
        }
        .text-center {
            text-align: center;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-16 {
            gap: 16px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }

        /* ===== Smooth fade-in on scroll (simple) ===== */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== Skip link ===== */
        .skip-link {
            position: absolute;
            top: -100px;
            left: 16px;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 8px 20px;
            border-radius: 8px;
            font-weight: 600;
            z-index: 1100;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 12px;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-light);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(26, 26, 62, 0.20);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(26, 26, 62, 0.35);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #e85d2c;
            --primary-dark: #cf4f22;
            --primary-light: #fdf2ee;
            --secondary: #1b2a4a;
            --secondary-light: #2c3f66;
            --accent: #f7b731;
            --bg-body: #f8f9fc;
            --bg-card: #ffffff;
            --bg-dark: #0f1a2e;
            --text: #1a2332;
            --text-light: #5a6a7e;
            --text-muted: #8a9aae;
            --border: #e8ecf2;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-hover: 0 8px 30px rgba(232,93,44,0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            background: var(--bg-body);
            color: var(--text);
            line-height: 1.6;
            font-size: 1rem;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; }
        ul { list-style: none; padding: 0; margin: 0; }

        /* ===== Container ===== */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* ===== Navbar ===== */
        .navbar-main {
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: 0 2px 16px rgba(0,0,0,0.04);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .navbar-main .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--secondary);
            letter-spacing: -0.5px;
        }
        .navbar-brand:hover { color: var(--primary); }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            font-weight: 700;
        }
        .navbar-toggler {
            display: none;
            background: none;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 12px;
            font-size: 1.3rem;
            color: var(--text);
            cursor: pointer;
            transition: var(--transition);
        }
        .navbar-toggler:hover { border-color: var(--primary); color: var(--primary); }
        .navbar-collapse { display: flex; align-items: center; gap: 24px; }
        .navbar-nav { display: flex; align-items: center; gap: 6px; }
        .nav-link {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            color: var(--text-light);
            font-size: 0.95rem;
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover { color: var(--primary); background: var(--primary-light); }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .navbar-cta { margin-left: 8px; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-align: center;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(232,93,44,0.30);
        }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,93,44,0.35); color: #fff; }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-sm { padding: 7px 18px; font-size: 0.88rem; }
        .btn-lg { padding: 14px 34px; font-size: 1.1rem; border-radius: var(--radius); }

        /* ===== Hero / Banner ===== */
        .article-banner {
            position: relative;
            background: var(--bg-dark);
            min-height: 320px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .article-banner-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.3;
        }
        .article-banner .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,26,46,0.85) 0%, rgba(27,42,74,0.70) 100%);
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
            padding: 60px 20px;
            text-align: center;
        }
        .article-banner h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.3;
            max-width: 800px;
            margin: 0 auto 16px;
            letter-spacing: -0.5px;
        }
        .article-banner .meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
        }
        .article-banner .meta span { display: inline-flex; align-items: center; gap: 6px; }
        .article-banner .meta .badge {
            background: var(--primary);
            color: #fff;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 600;
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: 60px 0;
            background: var(--bg-body);
        }
        .article-wrapper {
            max-width: 820px;
            margin: 0 auto;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            padding: 48px 56px;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body p { margin-bottom: 1.4em; }
        .article-body h2, .article-body h3 {
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            font-weight: 700;
            color: var(--secondary);
        }
        .article-body h2 { font-size: 1.6rem; }
        .article-body h3 { font-size: 1.3rem; }
        .article-body ul, .article-body ol { margin-bottom: 1.4em; padding-left: 1.6em; }
        .article-body li { margin-bottom: 0.4em; }
        .article-body img {
            border-radius: var(--radius);
            margin: 1.6em 0;
            width: 100%;
            box-shadow: var(--shadow);
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 1.6em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-body a { color: var(--primary); text-decoration: underline; }
        .article-body a:hover { color: var(--primary-dark); }
        .article-footer-meta {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .article-tags .tag {
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 500;
        }
        .article-share {
            display: flex;
            gap: 10px;
            align-items: center;
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--bg-body);
            color: var(--text-light);
            font-size: 1rem;
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .article-share a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

        /* ===== Related / CTA ===== */
        .related-section {
            padding: 50px 0 70px;
            background: var(--bg-body);
        }
        .related-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 32px;
            text-align: center;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 20px 24px;
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
        .related-card .cat-badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .related-card h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .related-card h4 a { color: var(--text); }
        .related-card h4 a:hover { color: var(--primary); }
        .related-card p { font-size: 0.92rem; color: var(--text-light); margin-bottom: 12px; }
        .related-card .date { font-size: 0.82rem; color: var(--text-muted); }

        .cta-section {
            background: var(--secondary);
            padding: 60px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-section .btn-primary { background: var(--accent); color: var(--secondary); box-shadow: 0 4px 20px rgba(247,183,49,0.35); }
        .cta-section .btn-primary:hover { background: #f0ad2e; transform: translateY(-3px); }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 60px 20px;
        }
        .not-found-box i { font-size: 4rem; color: var(--text-muted); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 1.8rem; color: var(--text); margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 24px; }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .navbar-brand { color: #fff; margin-bottom: 12px; }
        .footer-brand p { font-size: 0.92rem; line-height: 1.7; max-width: 320px; }
        .footer-col h5 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
        .footer-col ul li a i { width: 20px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p { font-size: 0.85rem; margin: 0; }
        .social-links { display: flex; gap: 12px; }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: rgba(255,255,255,0.5);
            font-size: 1rem;
            transition: var(--transition);
        }
        .social-links a:hover { background: var(--primary); color: #fff; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .article-wrapper { padding: 32px 28px; }
        }
        @media (max-width: 768px) {
            .navbar-toggler { display: block; }
            .navbar-collapse {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 12px;
                padding: 16px 0 8px;
                border-top: 1px solid var(--border);
                margin-top: 12px;
            }
            .navbar-collapse.show { display: flex; }
            .navbar-nav { flex-direction: column; width: 100%; gap: 2px; }
            .navbar-nav .nav-link { width: 100%; padding: 10px 16px; }
            .navbar-cta { width: 100%; margin-left: 0; }
            .navbar-cta .btn { width: 100%; justify-content: center; }
            .article-banner h1 { font-size: 1.6rem; }
            .article-wrapper { padding: 24px 18px; }
            .article-body { font-size: 0.98rem; }
            .article-footer-meta { flex-direction: column; align-items: flex-start; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .related-grid { grid-template-columns: 1fr; }
            .cta-section h2 { font-size: 1.5rem; }
        }
        @media (max-width: 520px) {
            .article-banner { min-height: 220px; }
            .article-banner h1 { font-size: 1.3rem; }
            .article-banner .meta { font-size: 0.82rem; gap: 10px; }
            .article-section { padding: 30px 0; }
            .article-wrapper { padding: 16px 12px; border-radius: var(--radius); }
            .related-section h2 { font-size: 1.3rem; }
            .container { padding: 0 12px; }
        }

/* roulang page: category1 */
/* ===== CSS 设计变量 ===== */
        :root {
            --primary: #2A7DE1;
            --primary-dark: #1A5FA8;
            --primary-light: #E8F1FD;
            --secondary: #F5A623;
            --secondary-dark: #D48E1A;
            --accent: #34C759;
            --bg-body: #F8FAFE;
            --bg-dark: #0F1923;
            --bg-card: #FFFFFF;
            --bg-card-alt: #F0F5FF;
            --text-primary: #1A2A3A;
            --text-secondary: #5A6A7A;
            --text-light: #FFFFFF;
            --text-muted: #8A9AAA;
            --border-color: #E2E8F0;
            --border-light: #F0F3F7;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 58, 0.06);
            --shadow-md: 0 8px 28px rgba(26, 42, 58, 0.08);
            --shadow-lg: 0 16px 48px rgba(26, 42, 58, 0.12);
            --shadow-hover: 0 20px 56px rgba(42, 125, 225, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            padding-left: 20px;
            padding-right: 20px;
            margin-left: auto;
            margin-right: auto;
            width: 100%;
        }

        /* ===== 导航 (卡片化控制面板) ===== */
        .navbar-main {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px) saturate(180%);
            -webkit-backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .navbar-main .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            flex-wrap: nowrap;
        }
        .navbar-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            white-space: nowrap;
        }
        .navbar-brand:hover {
            color: var(--primary);
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            font-weight: 700;
            box-shadow: 0 4px 12px rgba(42, 125, 225, 0.3);
        }
        .navbar-collapse {
            display: flex;
            align-items: center;
            gap: 32px;
            flex: 1;
            justify-content: flex-end;
        }
        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            padding: 4px;
            background: var(--bg-card-alt);
            border-radius: var(--radius);
            box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
        }
        .nav-item {
            margin: 0;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            text-decoration: none;
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary);
            background: rgba(42, 125, 225, 0.06);
        }
        .nav-link.active {
            color: var(--text-light);
            background: var(--primary);
            box-shadow: 0 4px 12px rgba(42, 125, 225, 0.3);
        }
        .nav-link.active:hover {
            color: var(--text-light);
            background: var(--primary-dark);
        }
        .navbar-cta {
            flex-shrink: 0;
        }
        .navbar-toggler {
            display: none;
            background: none;
            border: none;
            font-size: 1.4rem;
            color: var(--text-primary);
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: background var(--transition);
        }
        .navbar-toggler:hover {
            background: var(--bg-card-alt);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 28px;
            font-size: 0.95rem;
            font-weight: 600;
            border: none;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            cursor: pointer;
            text-decoration: none;
            line-height: 1.4;
            letter-spacing: 0.01em;
        }
        .btn:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-light);
            box-shadow: 0 4px 16px rgba(42, 125, 225, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: var(--text-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(42, 125, 225, 0.4);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(42, 125, 225, 0.3);
        }
        .btn-secondary {
            background: var(--secondary);
            color: var(--text-light);
            box-shadow: 0 4px 16px rgba(245, 166, 35, 0.3);
        }
        .btn-secondary:hover {
            background: var(--secondary-dark);
            color: var(--text-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 166, 35, 0.4);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--text-light);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            gap: 6px;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
            gap: 12px;
        }

        /* ===== 分类页横幅 ===== */
        .category-hero {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            min-height: 320px;
            display: flex;
            align-items: center;
            isolation: isolate;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 25, 35, 0.88) 0%, rgba(42, 125, 225, 0.55) 100%);
            z-index: 0;
            pointer-events: none;
        }
        .category-hero .container {
            position: relative;
            z-index: 1;
        }
        .category-hero-content {
            max-width: 720px;
        }
        .category-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .category-hero h1 span {
            color: var(--secondary);
        }
        .category-hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
            margin-bottom: 28px;
            max-width: 600px;
        }
        .category-hero .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .category-hero .hero-tags .badge {
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(8px);
            color: var(--text-light);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.01em;
            margin-bottom: 12px;
        }
        .section-header h2 .highlight {
            color: var(--primary);
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 580px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .section-header .divider {
            width: 48px;
            height: 4px;
            background: var(--primary);
            border-radius: 4px;
            margin: 16px auto 0;
        }

        .bg-alt {
            background: var(--bg-card-alt);
        }
        .bg-dark-section {
            background: var(--bg-dark);
            color: var(--text-light);
        }
        .bg-dark-section .section-header h2 {
            color: var(--text-light);
        }
        .bg-dark-section .section-header p {
            color: rgba(255, 255, 255, 0.7);
        }
        .bg-dark-section .section-header .divider {
            background: var(--secondary);
        }

        /* ===== 卡片 ===== */
        .card-modern {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card-modern:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .card-modern .card-img {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-card-alt);
        }
        .card-modern .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card-modern:hover .card-img img {
            transform: scale(1.05);
        }
        .card-modern .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-modern .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 12px;
        }
        .card-modern .card-tags .badge {
            padding: 4px 12px;
            font-size: 0.75rem;
            font-weight: 500;
            border-radius: 6px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .card-modern .card-tags .badge.hot {
            background: #FEF2E8;
            color: #D97706;
        }
        .card-modern .card-tags .badge.new {
            background: #E8F9F0;
            color: #059669;
        }
        .card-modern h3 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .card-modern p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }
        .card-modern .card-footer-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
            transition: gap var(--transition);
        }
        .card-modern .card-footer-link:hover {
            gap: 10px;
            color: var(--primary-dark);
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 14px;
            font-size: 0.8rem;
            font-weight: 500;
            border-radius: 6px;
            line-height: 1.4;
        }

        /* ===== 列表条目 ===== */
        .list-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 18px 0;
            border-bottom: 1px solid var(--border-light);
            transition: background var(--transition);
        }
        .list-item:last-child {
            border-bottom: none;
        }
        .list-item:hover {
            padding-left: 12px;
            background: rgba(42, 125, 225, 0.03);
            border-radius: var(--radius-sm);
        }
        .list-item .item-index {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 700;
            font-size: 0.9rem;
            border-radius: var(--radius-sm);
        }
        .list-item .item-content {
            flex: 1;
        }
        .list-item .item-content h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }
        .list-item .item-content p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }
        .list-item .item-meta {
            flex-shrink: 0;
            font-size: 0.82rem;
            color: var(--text-muted);
            white-space: nowrap;
        }

        /* ===== 图文区块 ===== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .feature-block .feature-text h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .feature-block .feature-text p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .feature-block .feature-text .feature-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .feature-block .feature-text .feature-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-primary);
        }
        .feature-block .feature-text .feature-list li i {
            color: var(--accent);
            font-size: 1.1rem;
        }
        .feature-block .feature-img {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .feature-block .feature-img img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 12px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-card-alt);
        }
        .faq-question i {
            font-size: 1.2rem;
            color: var(--primary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* ===== CTA 区块 ===== */
        .cta-block {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 80px 0;
            text-align: center;
            isolation: isolate;
            position: relative;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 25, 35, 0.9) 0%, rgba(42, 125, 225, 0.6) 100%);
            z-index: 0;
            pointer-events: none;
        }
        .cta-block .container {
            position: relative;
            z-index: 1;
        }
        .cta-block h2 {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .cta-block p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .cta-block .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer .navbar-brand {
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .footer .navbar-brand:hover {
            color: var(--secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
            margin-top: 8px;
        }
        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            transition: color var(--transition), padding-left var(--transition);
            display: inline-block;
        }
        .footer-col ul li a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom p {
            margin: 0;
        }
        .social-links {
            display: flex;
            gap: 14px;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
            transition: all var(--transition);
            text-decoration: none;
        }
        .social-links a:hover {
            background: var(--primary);
            color: var(--text-light);
            transform: translateY(-2px);
        }

        /* ===== 响应式设计 ===== */

        /* 平板 ≤ 1024px */
        @media (max-width: 1024px) {
            .category-hero h1 {
                font-size: 2.2rem;
            }
            .feature-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .feature-block .feature-img {
                order: -1;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        /* 小平板 ≤ 768px */
        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }

            .navbar-main .container {
                flex-wrap: wrap;
            }

            .navbar-toggler {
                display: block;
            }

            .navbar-collapse {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 16px;
                padding: 20px 0 16px;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                border-radius: 0 0 var(--radius) var(--radius);
                box-shadow: var(--shadow-md);
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                padding-left: 20px;
                padding-right: 20px;
            }
            .navbar-collapse.show {
                display: flex;
            }

            .navbar-nav {
                flex-direction: column;
                width: 100%;
                background: transparent;
                box-shadow: none;
                padding: 0;
                gap: 2px;
            }
            .nav-link {
                width: 100%;
                justify-content: center;
                padding: 12px 16px;
            }

            .navbar-cta {
                width: 100%;
                text-align: center;
            }
            .navbar-cta .btn {
                width: 100%;
                justify-content: center;
            }

            .category-hero {
                padding: 60px 0 40px;
                min-height: 240px;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero p {
                font-size: 1rem;
            }

            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }

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

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

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

            .category-hero h1 {
                font-size: 1.5rem;
            }
            .category-hero .hero-tags .badge {
                font-size: 0.75rem;
                padding: 4px 12px;
            }

            .section-header h2 {
                font-size: 1.35rem;
            }
            .section-header p {
                font-size: 0.92rem;
            }

            .feature-block .feature-text h3 {
                font-size: 1.25rem;
            }

            .list-item {
                flex-direction: column;
                gap: 8px;
            }
            .list-item .item-meta {
                align-self: flex-start;
            }

            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }

            .cta-block h2 {
                font-size: 1.6rem;
            }
            .cta-block p {
                font-size: 0.95rem;
            }
            .cta-block .btn-group .btn {
                width: 100%;
                justify-content: center;
            }

            .footer {
                padding: 40px 0 24px;
            }
        }

        /* ===== 辅助类 ===== */
        .text-primary {
            color: var(--primary) !important;
        }
        .text-secondary {
            color: var(--text-secondary) !important;
        }
        .text-muted {
            color: var(--text-muted) !important;
        }
        .fw-600 {
            font-weight: 600;
        }
        .gap-2 {
            gap: 8px;
        }
        .gap-3 {
            gap: 16px;
        }
        .mt-2 {
            margin-top: 8px;
        }
        .mt-3 {
            margin-top: 16px;
        }
        .mb-2 {
            margin-bottom: 8px;
        }
        .mb-3 {
            margin-bottom: 16px;
        }
        .mb-4 {
            margin-bottom: 24px;
        }
        .me-2 {
            margin-right: 8px;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .align-items-center {
            align-items: center;
        }
        .justify-content-center {
            justify-content: center;
        }