/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a4a;
            --primary-light: #2c4068;
            --primary-dark: #0f1a30;
            --accent: #c9a84c;
            --accent-light: #dfc16a;
            --accent-dark: #a88a30;
            --bg-body: #f7f6f3;
            --bg-card: #ffffff;
            --bg-section-alt: #edebe7;
            --bg-dark: #1a2a4a;
            --text-primary: #1e1e1e;
            --text-secondary: #5a5a5a;
            --text-muted: #8a8a8a;
            --text-light: #f5f3ee;
            --border-color: #e0ddd8;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: 0.25s ease;
            --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --font-heading: 'Inter', 'SF Pro Display', 'PingFang SC', 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --gap: 24px;
            --section-pad: 80px 0;
        }

        /* ===== 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-base);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            font-weight: 600;
            line-height: 1.3;
            color: var(--text-primary);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gap);
        }
        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 var(--gap);
        }

        /* ===== Utility ===== */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        .text-center {
            text-align: center;
        }
        .text-accent {
            color: var(--accent);
        }
        .section-pad {
            padding: var(--section-pad);
        }
        .bg-alt {
            background: var(--bg-section-alt);
        }
        .bg-dark {
            background: var(--bg-dark);
            color: var(--text-light);
        }
        .bg-dark h2,
        .bg-dark h3,
        .bg-dark h4 {
            color: var(--text-light);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-primary:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-light);
            border-color: var(--text-light);
        }
        .btn-outline:hover {
            background: var(--text-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-outline:focus-visible {
            outline: 3px solid var(--text-light);
            outline-offset: 3px;
        }
        .btn-ghost {
            background: transparent;
            color: var(--primary);
            border-color: var(--border-color);
        }
        .btn-ghost:hover {
            border-color: var(--accent);
            color: var(--accent-dark);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 0.9rem;
            border-radius: var(--radius-sm);
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
            background: rgba(201, 168, 76, 0.15);
            color: var(--accent-dark);
        }
        .badge-light {
            background: rgba(255, 255, 255, 0.15);
            color: var(--text-light);
        }
        .tag {
            display: inline-block;
            padding: 3px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.78rem;
            font-weight: 500;
            background: var(--bg-section-alt);
            color: var(--text-secondary);
            transition: background var(--transition);
        }
        .tag:hover {
            background: var(--accent);
            color: #fff;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(26, 42, 74, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gap);
        }
        .site-logo {
            font-family: var(--font-heading);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-light);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .site-logo i {
            color: var(--accent);
            font-size: 1.6rem;
        }
        .site-logo:hover {
            color: var(--accent-light);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.75);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 6px 0;
            position: relative;
            transition: color var(--transition);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width var(--transition);
        }
        .main-nav a:hover {
            color: var(--text-light);
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .main-nav a.active {
            color: var(--text-light);
        }
        .main-nav a.active::after {
            width: 100%;
        }
        .nav-cta {
            background: var(--accent);
            color: var(--primary-dark) !important;
            padding: 10px 24px !important;
            border-radius: var(--radius-sm);
            font-weight: 600;
        }
        .nav-cta:hover {
            background: var(--accent-light);
            color: var(--primary-dark) !important;
        }
        .nav-cta::after {
            display: none !important;
        }

        /* Mobile toggle */
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-light);
            background: none;
            border: none;
            padding: 4px;
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-tabbar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: var(--primary-dark);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            justify-content: space-around;
            align-items: center;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.7rem;
            font-weight: 500;
            transition: color var(--transition);
            border-radius: var(--radius-sm);
        }
        .tab-item i {
            font-size: 1.3rem;
        }
        .tab-item.active,
        .tab-item:hover {
            color: var(--accent);
        }
        .tab-item.active {
            background: rgba(201, 168, 76, 0.1);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            transform: scale(1.02);
            transition: transform 0.6s ease;
        }
        .hero:hover .hero-bg {
            transform: scale(1);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 48, 0.88) 0%, rgba(26, 42, 74, 0.72) 50%, rgba(15, 26, 48, 0.88) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 820px;
            padding: 60px var(--gap);
            text-align: center;
            color: var(--text-light);
        }
        .hero-content h1 {
            font-size: clamp(2.2rem, 6vw, 4rem);
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 20px;
            letter-spacing: -0.02em;
            line-height: 1.15;
        }
        .hero-content h1 span {
            color: var(--accent);
        }
        .hero-content p {
            font-size: clamp(1.05rem, 2vw, 1.25rem);
            color: rgba(255, 255, 255, 0.75);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .hero-waves {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 80'%3E%3Cpath fill='%23f7f6f3' d='M0,40 C360,80 1080,0 1440,40 L1440,80 L0,80 Z'/%3E%3C/svg%3E") center bottom / cover no-repeat;
            z-index: 3;
        }

        /* ===== Stats Strip ===== */
        .stats-strip {
            background: var(--bg-card);
            padding: 40px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
            text-align: center;
        }
        .stat-item {
            padding: 12px 0;
        }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ===== Section Headings ===== */
        .section-heading {
            margin-bottom: 48px;
        }
        .section-heading h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 12px;
        }
        .section-heading p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-heading .badge {
            margin-bottom: 12px;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .card-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap);
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img {
            transform: scale(1.03);
        }
        .card-body {
            padding: 22px 24px 26px;
        }
        .card-body .badge {
            margin-bottom: 10px;
        }
        .card-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .card-footer {
            padding: 14px 24px;
            border-top: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .card-footer .tag {
            font-size: 0.75rem;
        }

        /* ===== Feature / Intro Block ===== */
        .intro-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-block .intro-img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
        }
        .intro-block .intro-text h2 {
            font-size: clamp(1.4rem, 3vw, 2rem);
            margin-bottom: 18px;
        }
        .intro-block .intro-text p {
            color: var(--text-secondary);
            margin-bottom: 16px;
            line-height: 1.7;
        }
        .intro-block .intro-text .btn {
            margin-top: 8px;
        }

        /* ===== List / Posts ===== */
        .post-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .post-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--bg-card);
            padding: 18px 22px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .post-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .post-item .post-thumb {
            width: 80px;
            height: 80px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .post-item .post-info {
            flex: 1;
            min-width: 0;
        }
        .post-item .post-info h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .post-item .post-info p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-item .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .post-item .post-meta .badge {
            font-size: 0.7rem;
            padding: 2px 10px;
        }

        /* ===== Steps / Process ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 3rem;
            font-weight: 800;
            color: rgba(201, 168, 76, 0.12);
            line-height: 1;
        }
        .step-card .step-icon {
            font-size: 2.2rem;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .step-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-section-alt);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: var(--primary);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            color: var(--text-light);
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 30% 50%, rgba(201, 168, 76, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-block h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            color: var(--text-light);
            margin-bottom: 14px;
            position: relative;
        }
        .cta-block p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
            position: relative;
        }
        .cta-block .btn {
            position: relative;
        }
        .cta-block .btn i {
            font-size: 0.9rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.65);
            padding: 56px 0 100px 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.7;
            max-width: 320px;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            padding: 4px 0;
            color: rgba(255, 255, 255, 0.5);
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .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;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-social a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .intro-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-block .intro-img {
                max-height: 340px;
                object-fit: cover;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-pad: 56px 0;
                --gap: 18px;
            }
            .main-nav {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: var(--primary-dark);
                padding: 20px var(--gap);
                gap: 16px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                align-items: flex-start;
            }
            .main-nav.open a {
                width: 100%;
                padding: 8px 0;
            }
            .main-nav.open .nav-cta {
                width: auto;
                padding: 10px 24px !important;
            }
            .mobile-tabbar {
                display: flex;
            }
            .site-footer {
                padding-bottom: 80px;
            }
            .hero {
                min-height: 70vh;
            }
            .hero-content h1 {
                font-size: clamp(1.8rem, 5vw, 2.6rem);
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card-grid-2 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .post-item {
                flex-direction: column;
                align-items: flex-start;
                padding: 16px;
            }
            .post-item .post-thumb {
                width: 100%;
                height: 160px;
            }
            .cta-block {
                padding: 40px 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .hero {
                min-height: 60vh;
            }
            .hero-content {
                padding: 40px 16px;
            }
            .hero-content h1 {
                font-size: 1.6rem;
            }
            .hero-content p {
                font-size: 0.95rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                max-width: 260px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .section-heading h2 {
                font-size: 1.3rem;
            }
            .card-body {
                padding: 16px 18px 20px;
            }
            .card-body h3 {
                font-size: 1rem;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .faq-question {
                font-size: 0.92rem;
                padding: 16px 18px;
            }
            .faq-answer {
                padding: 0 18px 16px;
                font-size: 0.88rem;
            }
            .cta-block h2 {
                font-size: 1.3rem;
            }
        }

        /* ===== Focus visible for accessibility ===== */
        :focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Empty state ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }
        .empty-state i {
            font-size: 2rem;
            color: var(--border-color);
            margin-bottom: 12px;
            display: block;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #0a1628;
            --primary-light: #1a2d4a;
            --primary-dark: #060e1a;
            --accent: #e4a010;
            --accent-hover: #f0b830;
            --accent-glow: rgba(228, 160, 16, 0.3);
            --bg-body: #f5f7fa;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-section: #eef1f6;
            --bg-dark: #0a1628;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #8a9aaa;
            --text-white: #f0f2f5;
            --text-muted: #a0b0c0;
            --border-color: #e2e6ec;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 6px 22px rgba(0, 0, 0, 0.07);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.10);
            --shadow-glow: 0 4px 24px var(--accent-glow);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --max-width: 1200px;
            --header-h: 72px;
            --footer-top-pad: 56px;
        }

        /* ===== 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: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--accent-hover);
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
            background: transparent;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

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

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 22, 40, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            height: var(--header-h);
            transition: background var(--transition);
        }

        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.5px;
            transition: opacity var(--transition);
        }
        .site-logo i {
            color: var(--accent);
            font-size: 1.3rem;
        }
        .site-logo:hover {
            color: var(--accent);
            opacity: 0.92;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 0.92rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a:hover,
        .main-nav a:focus-visible {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }
        .main-nav a.active {
            color: #fff;
            background: var(--accent);
            box-shadow: var(--shadow-glow);
        }
        .main-nav a.active:hover {
            background: var(--accent-hover);
        }
        .main-nav a.nav-cta {
            background: transparent;
            border: 1.5px solid var(--accent);
            color: var(--accent);
            padding: 8px 22px;
        }
        .main-nav a.nav-cta:hover {
            background: var(--accent);
            color: #fff;
            box-shadow: var(--shadow-glow);
        }

        .nav-toggle {
            display: none;
            color: var(--text-white);
            font-size: 1.5rem;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.14);
        }

        /* Mobile bottom tab */
        .mobile-tab-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(10, 22, 40, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            justify-content: space-around;
            align-items: center;
        }
        .mobile-tab-bar a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            font-size: 0.7rem;
            color: rgba(255, 255, 255, 0.55);
            transition: all var(--transition);
            border-radius: var(--radius-sm);
            min-width: 60px;
        }
        .mobile-tab-bar a i {
            font-size: 1.2rem;
        }
        .mobile-tab-bar a:hover,
        .mobile-tab-bar a.active {
            color: var(--accent);
            background: rgba(228, 160, 16, 0.08);
        }
        .mobile-tab-bar a.active {
            color: var(--accent);
        }

        /* ===== Banner / Hero (Category) ===== */
        .category-banner {
            margin-top: var(--header-h);
            padding: 72px 0 64px;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .category-banner h1 i {
            color: var(--accent);
            margin-right: 12px;
        }
        .category-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .category-banner .badge-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 28px;
        }
        .category-banner .badge-group span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(6px);
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.85);
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .category-banner .badge-group span i {
            color: var(--accent);
        }

        /* ===== Common section ===== */
        .section {
            padding: 64px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark .section-subtitle {
            color: var(--text-white);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 44px auto;
            line-height: 1.7;
        }
        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .card-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        .card-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .card-item .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            background: #e8ecf0;
        }
        .card-item .card-body {
            padding: 22px 24px 26px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-item .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--accent);
            background: rgba(228, 160, 16, 0.10);
            padding: 4px 12px;
            border-radius: 40px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .card-item h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card-item h3 a {
            color: var(--text-primary);
        }
        .card-item h3 a:hover {
            color: var(--accent);
        }
        .card-item p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            flex: 1;
        }
        .card-item .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border-color);
            font-size: 0.82rem;
            color: var(--text-light);
        }
        .card-item .card-meta i {
            margin-right: 4px;
        }

        /* ===== Feature / List block ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
            align-items: start;
        }
        .feature-block {
            display: flex;
            gap: 20px;
            padding: 24px 28px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .feature-block:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .feature-block .feat-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(228, 160, 16, 0.10);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent);
        }
        .feature-block h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .feature-block p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== List / Timeline ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-list .list-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 18px 24px;
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            cursor: default;
        }
        .content-list .list-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }
        .content-list .list-item .list-num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--accent);
            min-width: 40px;
            opacity: 0.7;
        }
        .content-list .list-item .list-content {
            flex: 1;
        }
        .content-list .list-item .list-content h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 2px;
        }
        .content-list .list-item .list-content p {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        .content-list .list-item .list-badge {
            font-size: 0.75rem;
            padding: 4px 14px;
            border-radius: 40px;
            background: rgba(228, 160, 16, 0.08);
            color: var(--accent);
            font-weight: 600;
            white-space: nowrap;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stats-grid .stat-item {
            padding: 28px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition);
        }
        .stats-grid .stat-item:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .stats-grid .stat-item .stat-num {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stats-grid .stat-item .stat-label {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            user-select: none;
            transition: background var(--transition);
            color: var(--text-primary);
        }
        .faq-item .faq-q:hover {
            background: rgba(228, 160, 16, 0.04);
        }
        .faq-item .faq-q i {
            color: var(--accent);
            transition: transform var(--transition);
            font-size: 0.9rem;
        }
        .faq-item.active .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-a {
            max-height: 260px;
            padding: 0 24px 20px;
        }
        .section-dark .faq-item {
            background: rgba(255, 255, 255, 0.04);
            border-color: rgba(255, 255, 255, 0.08);
        }
        .section-dark .faq-item .faq-q {
            color: var(--text-white);
        }
        .section-dark .faq-item .faq-a {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-box .container {
            position: relative;
            z-index: 2;
        }
        .cta-box h2 {
            font-size: 2rem;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-box p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-box .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 30px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 1.5px solid transparent;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-primary:hover,
        .btn-primary:focus-visible {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            color: #fff;
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover,
        .btn-outline:focus-visible {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--text-white);
            color: var(--text-white);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }

        /* ===== Tags ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .tag-list a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 500;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .tag-list a:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(228, 160, 16, 0.04);
            transform: translateY(-1px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
            margin-bottom: 60px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .site-logo {
            font-size: 1.3rem;
            margin-bottom: 12px;
            display: inline-flex;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            padding: 5px 0;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            transition: all var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 22px 0 28px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            color: rgba(255, 255, 255, 0.35);
            font-size: 1.2rem;
            transition: color var(--transition);
        }
        .footer-social a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .category-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .main-nav.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(10, 22, 40, 0.98);
                backdrop-filter: blur(16px);
                padding: 16px 24px 28px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                gap: 6px;
                align-items: stretch;
            }
            .main-nav.open a {
                padding: 12px 20px;
                border-radius: var(--radius-sm);
            }
            .nav-toggle {
                display: block;
            }
            .mobile-tab-bar {
                display: flex;
            }
            .site-footer {
                margin-bottom: 56px;
            }
            .category-banner {
                padding: 48px 0 44px;
                min-height: 220px;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .category-banner p {
                font-size: 1rem;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stats-grid .stat-item .stat-num {
                font-size: 2rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 1.5rem;
            }
            .feature-block {
                flex-direction: column;
                padding: 20px;
            }
            .content-list .list-item {
                flex-wrap: wrap;
                padding: 16px 18px;
            }
            .content-list .list-item .list-num {
                min-width: 28px;
                font-size: 1.2rem;
            }
            .faq-item .faq-q {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-item .faq-a {
                padding: 0 18px;
                font-size: 0.88rem;
            }
            .faq-item.active .faq-a {
                padding: 0 18px 16px;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                padding: 0 16px;
            }
            .site-logo {
                font-size: 1.2rem;
            }
            .category-banner h1 {
                font-size: 1.5rem;
            }
            .category-banner .badge-group span {
                font-size: 0.75rem;
                padding: 5px 14px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .section-subtitle {
                font-size: 0.92rem;
                margin-bottom: 28px;
            }
            .card-item .card-body {
                padding: 16px 18px 20px;
            }
            .stats-grid .stat-item {
                padding: 20px 12px;
            }
            .stats-grid .stat-item .stat-num {
                font-size: 1.6rem;
            }
            .btn {
                padding: 10px 22px;
                font-size: 0.88rem;
            }
            .cta-box {
                padding: 32px 18px;
            }
            .cta-box h2 {
                font-size: 1.3rem;
            }
            .footer-grid {
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Accessibility ===== */
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== Utilities ===== */
        .text-center {
            text-align: center;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #c4282c;
            --primary-dark: #a01e22;
            --primary-light: #e84448;
            --secondary: #1a1a2e;
            --secondary-light: #2d2d4a;
            --accent: #f5c518;
            --accent-dark: #d4a814;
            --bg-body: #f8f7f4;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --bg-soft: #f0ede8;
            --text-dark: #1a1a2e;
            --text-body: #3d3d4a;
            --text-muted: #7a7a8a;
            --text-light: #f8f7f4;
            --border-light: #e8e5e0;
            --border-medium: #d0cdc8;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.16);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *, *::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: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        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; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--text-dark); font-weight: 700; }

        /* ===== 容器 ===== */
        .container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
        @media (max-width: 768px) { .container { padding: 0 16px; } }

        /* ===== 站点头部 ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .header-inner {
            max-width: var(--container-max); margin: 0 auto; padding: 0 24px;
            display: flex; align-items: center; justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.5rem; font-weight: 800; color: var(--primary);
            letter-spacing: -0.5px;
        }
        .site-logo i { font-size: 1.6rem; color: var(--primary); }
        .site-logo:hover { color: var(--primary-dark); }
        .main-nav { display: flex; align-items: center; gap: 8px; }
        .main-nav a {
            padding: 8px 18px; border-radius: var(--radius-sm);
            font-size: 0.95rem; font-weight: 500; color: var(--text-body);
            transition: var(--transition); position: relative;
        }
        .main-nav a:hover { color: var(--primary); background: rgba(196,40,44,0.06); }
        .main-nav a.active { color: var(--primary); font-weight: 600; background: rgba(196,40,44,0.10); }
        .main-nav a.active::after {
            content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
            width: 20px; height: 3px; background: var(--primary); border-radius: 3px;
        }
        .main-nav a.nav-cta {
            background: var(--primary); color: #fff; padding: 8px 22px;
            border-radius: var(--radius-sm); font-weight: 600;
            display: flex; align-items: center; gap: 6px;
        }
        .main-nav a.nav-cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-sm); }
        .nav-toggle { display: none; font-size: 1.4rem; color: var(--text-dark); padding: 8px; }
        @media (max-width: 768px) {
            .main-nav { display: none; position: absolute; top: var(--header-height); left: 0; right: 0;
                background: rgba(255,255,255,0.98); backdrop-filter: blur(16px);
                flex-direction: column; padding: 16px 24px 24px; gap: 4px;
                border-bottom: 1px solid var(--border-light); box-shadow: var(--shadow-md); }
            .main-nav.open { display: flex; }
            .main-nav a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .main-nav a.nav-cta { justify-content: center; }
            .nav-toggle { display: flex; align-items: center; justify-content: center; }
        }

        /* ===== 文章详情页 ===== */
        .article-banner {
            margin-top: var(--header-height);
            padding: 80px 0 60px;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-2.png') no-repeat center center / cover;
            opacity: 0.20;
            pointer-events: none;
        }
        .article-banner .container { position: relative; z-index: 2; }
        .article-breadcrumb {
            display: flex; align-items: center; gap: 8px;
            color: rgba(255,255,255,0.6); font-size: 0.9rem; margin-bottom: 20px;
        }
        .article-breadcrumb a { color: rgba(255,255,255,0.7); }
        .article-breadcrumb a:hover { color: #fff; }
        .article-breadcrumb span { color: rgba(255,255,255,0.4); }
        .article-badge {
            display: inline-block;
            background: var(--accent); color: var(--text-dark);
            padding: 4px 14px; border-radius: 20px;
            font-size: 0.8rem; font-weight: 600; letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .article-banner h1 {
            font-size: 2.6rem; color: #fff; max-width: 860px;
            line-height: 1.25; margin-bottom: 20px;
        }
        .article-meta {
            display: flex; align-items: center; gap: 24px;
            color: rgba(255,255,255,0.65); font-size: 0.95rem; flex-wrap: wrap;
        }
        .article-meta i { margin-right: 6px; }
        .article-meta .meta-cat { color: var(--accent); font-weight: 500; }

        @media (max-width: 768px) {
            .article-banner { padding: 60px 0 40px; }
            .article-banner h1 { font-size: 1.8rem; }
            .article-meta { gap: 14px; font-size: 0.85rem; }
        }

        /* ===== 正文区 ===== */
        .article-main { padding: 60px 0 80px; }
        .article-layout {
            display: grid; grid-template-columns: 1fr 320px; gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card); border-radius: var(--radius-lg);
            padding: 48px; box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        .article-body .featured-image {
            width: 100%; border-radius: var(--radius-md); margin-bottom: 32px;
            object-fit: cover; max-height: 480px;
        }
        .article-body .content {
            font-size: 1.05rem; line-height: 1.9;
            color: var(--text-body);
        }
        .article-body .content p { margin-bottom: 1.5em; }
        .article-body .content h2 { font-size: 1.6rem; margin: 1.8em 0 0.6em; }
        .article-body .content h3 { font-size: 1.25rem; margin: 1.5em 0 0.5em; }
        .article-body .content ul, .article-body .content ol { margin: 1em 0; padding-left: 1.5em; }
        .article-body .content li { margin-bottom: 0.5em; list-style: disc; }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary); background: var(--bg-soft);
            padding: 16px 24px; margin: 1.5em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-dark); font-style: italic;
        }
        .article-body .content img { border-radius: var(--radius-md); margin: 1.5em 0; }
        .article-body .content a { color: var(--primary); font-weight: 500; text-decoration: underline; }
        .article-body .content a:hover { color: var(--primary-dark); }

        .article-sidebar {
            display: flex; flex-direction: column; gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card); border-radius: var(--radius-md);
            padding: 28px; border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 1.1rem; margin-bottom: 16px; padding-bottom: 12px;
            border-bottom: 2px solid var(--border-light);
            display: flex; align-items: center; gap: 8px;
        }
        .sidebar-card h3 i { color: var(--primary); }
        .sidebar-list a {
            display: flex; align-items: flex-start; gap: 12px;
            padding: 12px 0; border-bottom: 1px solid var(--border-light);
            color: var(--text-body); font-size: 0.95rem;
        }
        .sidebar-list a:last-child { border-bottom: none; }
        .sidebar-list a:hover { color: var(--primary); }
        .sidebar-list a i { margin-top: 3px; color: var(--primary); font-size: 0.8rem; }
        .sidebar-cta {
            background: var(--primary); color: #fff; border-radius: var(--radius-md);
            padding: 28px; text-align: center;
        }
        .sidebar-cta h4 { color: #fff; font-size: 1.1rem; margin-bottom: 8px; }
        .sidebar-cta p { color: rgba(255,255,255,0.85); font-size: 0.9rem; margin-bottom: 16px; }
        .sidebar-cta .btn {
            display: inline-block; background: #fff; color: var(--primary);
            padding: 10px 28px; border-radius: var(--radius-sm); font-weight: 600;
            transition: var(--transition);
        }
        .sidebar-cta .btn:hover { background: var(--accent); color: var(--text-dark); transform: translateY(-2px); }

        @media (max-width: 992px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-body { padding: 32px; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
        }
        @media (max-width: 640px) {
            .article-body { padding: 24px 16px; }
            .article-sidebar { grid-template-columns: 1fr; }
            .article-body .content { font-size: 1rem; }
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center; padding: 80px 24px;
            background: var(--bg-card); border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm); border: 1px solid var(--border-light);
        }
        .not-found-box i { font-size: 3rem; color: var(--text-muted); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-muted); margin-bottom: 24px; }
        .not-found-box .btn-home {
            display: inline-block; background: var(--primary); color: #fff;
            padding: 12px 32px; border-radius: var(--radius-sm); font-weight: 600;
        }
        .not-found-box .btn-home:hover { background: var(--primary-dark); transform: translateY(-2px); }

        /* ===== 按钮通用 ===== */
        .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px;
            border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem;
            transition: var(--transition); border: none; cursor: pointer; }
        .btn-primary { background: var(--primary); color: #fff; }
        .btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .btn-ghost { background: transparent; color: var(--text-dark); border: 2px solid var(--border-medium); }
        .btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark); color: rgba(255,255,255,0.75);
            padding: 60px 0 30px; margin-top: 0;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .site-logo { color: #fff; margin-bottom: 16px; display: inline-flex; }
        .footer-brand .site-logo i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 360px; color: rgba(255,255,255,0.6); }
        .footer-col h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
        .footer-col a { display: block; color: rgba(255,255,255,0.6); font-size: 0.9rem; padding: 4px 0; }
        .footer-col a:hover { color: #fff; }
        .footer-bottom {
            display: flex; justify-content: space-between; align-items: center;
            padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.10);
            font-size: 0.85rem; color: rgba(255,255,255,0.5); flex-wrap: wrap; gap: 16px;
        }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a { color: rgba(255,255,255,0.5); font-size: 1.2rem; }
        .footer-social a:hover { color: #fff; }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
            .footer-brand { grid-column: 1 / -1; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (max-width: 480px) {
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ===== 返回顶部 ===== */
        .back-top {
            position: fixed; bottom: 32px; right: 32px; z-index: 999;
            width: 48px; height: 48px; border-radius: 50%;
            background: var(--primary); color: #fff; font-size: 1.2rem;
            display: flex; align-items: center; justify-content: center;
            box-shadow: var(--shadow-md); opacity: 0; visibility: hidden;
            transition: var(--transition); transform: translateY(12px);
        }
        .back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
        .back-top:hover { background: var(--primary-dark); transform: translateY(-4px); }
        @media (max-width: 768px) { .back-top { bottom: 24px; right: 24px; } }

        /* ===== 响应式微调 ===== */
        @media (max-width: 520px) {
            .article-banner h1 { font-size: 1.5rem; }
            .article-meta { flex-direction: column; gap: 6px; align-items: flex-start; }
            .header-inner { padding: 0 16px; }
        }

        /* ===== 文章内容动画 ===== */
        .fade-in { animation: fadeInUp 0.6s ease forwards; }
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }