/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --clr-bg: #0a0a12;
            --clr-surface: #12121f;
            --clr-surface-alt: #1a1a2e;
            --clr-card: #16162a;
            --clr-card-hover: #1e1e3a;
            --clr-primary: #00d4ff;
            --clr-primary-dim: rgba(0, 212, 255, 0.12);
            --clr-secondary: #7c3aed;
            --clr-accent: #00ff88;
            --clr-accent-dim: rgba(0, 255, 136, 0.12);
            --clr-text: #f1f5f9;
            --clr-text-secondary: #94a3b8;
            --clr-text-muted: #64748b;
            --clr-border: rgba(0, 212, 255, 0.15);
            --clr-border-hover: rgba(0, 212, 255, 0.35);
            --clr-glow: rgba(0, 212, 255, 0.25);
            --clr-glow-accent: rgba(0, 255, 136, 0.2);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 212, 255, 0.06);
            --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 212, 255, 0.2);
            --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
            --shadow-btn: 0 4px 20px rgba(0, 212, 255, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --nav-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--clr-text);
            background: var(--clr-bg);
            min-height: 100vh;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--clr-text);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--clr-primary);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--clr-text);
        }

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

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(10, 10, 18, 0.92);
            backdrop-filter: blur(18px) saturate(1.2);
            border-bottom: 1px solid var(--clr-border);
            box-shadow: 0 2px 30px rgba(0, 0, 0, 0.5);
            transition: background var(--transition), border-color var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: var(--clr-text);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
            position: relative;
        }
        .site-logo::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--clr-primary), transparent);
            border-radius: 2px;
        }
        .site-logo i {
            font-size: 26px;
            -webkit-text-fill-color: var(--clr-primary);
            background: none;
            filter: drop-shadow(0 0 8px var(--clr-glow));
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            position: relative;
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--clr-text-secondary);
            transition: color var(--transition), background var(--transition), box-shadow var(--transition);
        }
        .main-nav a i {
            font-size: 14px;
            opacity: 0.6;
            transition: opacity var(--transition);
        }
        .main-nav a:hover,
        .main-nav a:focus-visible {
            color: var(--clr-text);
            background: var(--clr-primary-dim);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.06);
        }
        .main-nav a:hover i,
        .main-nav a:focus-visible i {
            opacity: 1;
        }
        .main-nav a.active {
            color: var(--clr-primary);
            background: var(--clr-primary-dim);
            box-shadow: inset 0 -2px 0 var(--clr-primary), 0 0 24px rgba(0, 212, 255, 0.1);
        }
        .main-nav a.active i {
            opacity: 1;
            color: var(--clr-primary);
        }
        .nav-cta {
            padding: 8px 22px !important;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary)) !important;
            color: #fff !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            box-shadow: var(--shadow-btn) !important;
            transition: transform var(--transition), box-shadow var(--transition) !important;
        }
        .nav-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 8px 30px rgba(0, 212, 255, 0.35) !important;
            color: #fff !important;
        }
        .nav-cta i {
            color: #fff !important;
            opacity: 1 !important;
        }

        /* 移动端汉堡 */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: transparent;
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: border-color var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--clr-text);
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }
        .nav-toggle:hover {
            border-color: var(--clr-primary);
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                flex-direction: column;
                gap: 4px;
                padding: 16px 20px 24px;
                background: rgba(10, 10, 18, 0.98);
                backdrop-filter: blur(20px);
                border-bottom: 1px solid var(--clr-border);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: transform 0.4s ease, opacity 0.4s ease;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 18px;
                font-size: 16px;
                justify-content: center;
            }
            .nav-cta {
                margin-top: 8px;
                text-align: center;
                justify-content: center;
            }
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: calc(var(--nav-height) + 40px) 24px 80px;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            isolation: isolate;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(165deg, rgba(10, 10, 18, 0.88) 30%, rgba(10, 10, 18, 0.55) 70%, rgba(10, 10, 18, 0.70) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 860px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 100px;
            background: var(--clr-primary-dim);
            border: 1px solid rgba(0, 212, 255, 0.2);
            font-size: 13px;
            font-weight: 500;
            color: var(--clr-primary);
            letter-spacing: 0.3px;
            margin-bottom: 28px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 12px;
        }
        .hero h1 {
            font-size: clamp(2.6rem, 6vw, 4.4rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 40%, var(--clr-primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: clamp(1.05rem, 2vw, 1.3rem);
            color: var(--clr-text-secondary);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 16px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 38px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--clr-primary), #0099cc);
            color: #fff;
            font-weight: 600;
            font-size: 17px;
            box-shadow: var(--shadow-btn);
            transition: transform var(--transition), box-shadow var(--transition);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 12px 40px rgba(0, 212, 255, 0.4);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 34px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.06);
            color: var(--clr-text);
            font-weight: 500;
            font-size: 17px;
            border: 1px solid var(--clr-border);
            backdrop-filter: blur(4px);
            transition: background var(--transition), border-color var(--transition), transform var(--transition);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: var(--clr-border-hover);
            transform: translateY(-2px);
            color: var(--clr-text);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px 60px;
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat-item {
            text-align: center;
        }
        .hero-stat-item .num {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: block;
            line-height: 1.2;
        }
        .hero-stat-item .label {
            font-size: 14px;
            color: var(--clr-text-muted);
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .hero {
                min-height: 80vh;
                padding: calc(var(--nav-height) + 30px) 16px 60px;
            }
            .hero-stats {
                gap: 24px 32px;
                padding-top: 28px;
                margin-top: 36px;
            }
            .hero-stat-item .num {
                font-size: 1.6rem;
            }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 90px 0;
            position: relative;
        }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 56px;
        }
        .section-header .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 16px;
            border-radius: 100px;
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .section-header h2 {
            font-size: clamp(1.8rem, 3.6vw, 2.6rem);
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--clr-text);
        }
        .section-header p {
            color: var(--clr-text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
        }

        @media (max-width: 768px) {
            .section {
                padding: 60px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
        }

        /* ===== 特色卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--clr-card);
            border-radius: var(--radius-lg);
            padding: 36px 28px 32px;
            border: 1px solid var(--clr-border);
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--clr-border-hover);
        }
        .feature-card .icon {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            margin: 0 auto 20px;
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            transition: background var(--transition), transform var(--transition);
        }
        .feature-card:hover .icon {
            background: rgba(0, 212, 255, 0.2);
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .feature-card p {
            color: var(--clr-text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* ===== 分类入口 ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--clr-card);
            border: 1px solid var(--clr-border);
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            aspect-ratio: 4 / 3;
            display: flex;
            align-items: flex-end;
            padding: 20px;
        }
        .category-card .bg-img {
            position: absolute;
            inset: 0;
            z-index: 0;
            object-fit: cover;
            width: 100%;
            height: 100%;
            transition: transform 0.5s ease;
        }
        .category-card:hover .bg-img {
            transform: scale(1.06);
        }
        .category-card .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(10, 10, 18, 0.85) 20%, rgba(10, 10, 18, 0.20) 70%);
            z-index: 1;
        }
        .category-card .content {
            position: relative;
            z-index: 2;
        }
        .category-card .content h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 4px;
            color: #fff;
        }
        .category-card .content p {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.5;
        }
        .category-card .content .arrow {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            margin-top: 10px;
            font-size: 13px;
            color: var(--clr-primary);
            font-weight: 500;
            transition: gap var(--transition);
        }
        .category-card:hover .content .arrow {
            gap: 10px;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--clr-border-hover);
        }

        @media (max-width: 520px) {
            .categories-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            counter-reset: step-counter;
        }
        .step-card {
            background: var(--clr-card);
            border-radius: var(--radius-lg);
            padding: 32px 24px 28px;
            border: 1px solid var(--clr-border);
            box-shadow: var(--shadow-card);
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition);
            position: relative;
            counter-increment: step-counter;
        }
        .step-card::before {
            content: counter(step-counter);
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 3rem;
            font-weight: 800;
            color: rgba(0, 212, 255, 0.08);
            line-height: 1;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        .step-card .step-icon {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin: 0 auto 16px;
            background: linear-gradient(135deg, var(--clr-primary-dim), var(--clr-accent-dim));
            color: var(--clr-primary);
        }
        .step-card h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--clr-text-secondary);
            line-height: 1.7;
        }

        /* ===== 资讯/文章列表 ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .news-card {
            background: var(--clr-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--clr-border);
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--clr-border-hover);
        }
        .news-card .thumb {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--clr-surface-alt);
        }
        .news-card .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .news-card:hover .thumb img {
            transform: scale(1.05);
        }
        .news-card .thumb .cat-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            border-radius: 100px;
            background: rgba(0, 212, 255, 0.85);
            backdrop-filter: blur(4px);
            font-size: 12px;
            font-weight: 600;
            color: #0a0a12;
        }
        .news-card .body {
            padding: 20px 22px 22px;
        }
        .news-card .body .meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 13px;
            color: var(--clr-text-muted);
            margin-bottom: 10px;
        }
        .news-card .body .meta i {
            font-size: 12px;
            margin-right: 4px;
        }
        .news-card .body h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card .body h3 a {
            color: var(--clr-text);
            transition: color var(--transition);
        }
        .news-card .body h3 a:hover {
            color: var(--clr-primary);
        }
        .news-card .body p {
            font-size: 0.9rem;
            color: var(--clr-text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--clr-text-muted);
            background: var(--clr-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--clr-border);
        }
        .news-empty i {
            font-size: 48px;
            margin-bottom: 16px;
            opacity: 0.3;
            display: block;
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: var(--clr-surface);
            border-top: 1px solid var(--clr-border);
            border-bottom: 1px solid var(--clr-border);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 32px;
            text-align: center;
        }
        .stat-item .num {
            font-size: 2.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: block;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .stat-item .label {
            font-size: 15px;
            color: var(--clr-text-secondary);
            margin-top: 6px;
        }

        @media (max-width: 768px) {
            .stats-grid {
                gap: 24px;
            }
            .stat-item .num {
                font-size: 2rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--clr-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-border-hover);
            box-shadow: var(--shadow-card);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--clr-text);
            background: transparent;
            border: none;
            text-align: left;
            cursor: pointer;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--clr-primary);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            font-size: 14px;
            transition: transform var(--transition), background var(--transition);
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
            background: var(--clr-primary);
            color: #0a0a12;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--clr-text-secondary);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--clr-surface);
            border-top: 1px solid var(--clr-border);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-box {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
            padding: 20px 0;
        }
        .cta-box h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 700;
            margin-bottom: 16px;
        }
        .cta-box p {
            color: var(--clr-text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .cta-box .btn-primary {
            font-size: 18px;
            padding: 18px 44px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--clr-surface);
            border-top: 1px solid var(--clr-border);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo {
            font-size: 20px;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--clr-text-secondary);
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--clr-text);
        }
        .footer-col a {
            display: block;
            padding: 4px 0;
            font-size: 14px;
            color: var(--clr-text-secondary);
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover {
            color: var(--clr-primary);
            padding-left: 6px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 13px;
            color: var(--clr-text-muted);
        }
        .footer-bottom a {
            color: var(--clr-text-muted);
        }
        .footer-bottom a:hover {
            color: var(--clr-primary);
        }
        .footer-socials {
            display: flex;
            gap: 12px;
        }
        .footer-socials a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.05);
            color: var(--clr-text-secondary);
            font-size: 16px;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-socials a:hover {
            background: var(--clr-primary);
            color: #0a0a12;
            transform: translateY(-2px);
            padding-left: 0;
        }

        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 通用辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-8 {
            gap: 8px;
        }

        /* ===== 文章页通用 (用于article.php复用) ===== */
        .article-hero {
            position: relative;
            padding: calc(var(--nav-height) + 40px) 24px 50px;
            background: var(--clr-surface);
            border-bottom: 1px solid var(--clr-border);
            text-align: center;
        }
        .article-hero h1 {
            font-size: clamp(1.6rem, 3.6vw, 2.6rem);
            max-width: 780px;
            margin: 0 auto 14px;
        }
        .article-hero .meta {
            color: var(--clr-text-muted);
            font-size: 14px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .article-hero .meta i {
            margin-right: 4px;
        }
        .article-body {
            max-width: 760px;
            margin: 0 auto;
            padding: 48px 24px 80px;
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--clr-text-secondary);
        }
        .article-body p {
            margin-bottom: 1.4em;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 32px auto;
            box-shadow: var(--shadow-card);
        }
        .article-body h2,
        .article-body h3 {
            color: var(--clr-text);
            margin-top: 1.8em;
            margin-bottom: 0.6em;
        }
        .article-body ul,
        .article-body ol {
            padding-left: 24px;
            margin-bottom: 1.4em;
        }
        .article-body li {
            margin-bottom: 0.4em;
        }
        .article-body a {
            color: var(--clr-primary);
            border-bottom: 1px solid rgba(0, 212, 255, 0.25);
        }
        .article-body a:hover {
            border-color: var(--clr-primary);
        }
        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found i {
            font-size: 56px;
            color: var(--clr-text-muted);
            opacity: 0.3;
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--clr-text-secondary);
            margin-bottom: 24px;
        }
        .article-not-found .btn-primary {
            display: inline-flex;
        }

        /* ===== 焦点 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--clr-bg);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(0, 212, 255, 0.25);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(0, 212, 255, 0.4);
        }

        /* ===== 响应式 Fine-tune ===== */
        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: 1fr 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
        }
        @media (min-width: 769px) {
            .main-nav {
                display: flex !important;
                opacity: 1 !important;
                pointer-events: auto !important;
                transform: none !important;
                position: static !important;
                background: transparent !important;
                backdrop-filter: none !important;
                border: none !important;
                box-shadow: none !important;
                padding: 0 !important;
            }
        }

/* roulang page: category1 */
/* ============================================================
           :root 设计变量
           ============================================================ */
        :root {
            --clr-primary: #f5c518;
            --clr-primary-light: #ffde5c;
            --clr-primary-dark: #c99500;
            --clr-accent: #ff3c6f;
            --clr-accent-light: #ff6b92;
            --clr-bg: #0d0d0f;
            --clr-bg-alt: #16161a;
            --clr-bg-card: #1c1c22;
            --clr-bg-card-hover: #26262e;
            --clr-text: #f0ece4;
            --clr-text-muted: #a09a90;
            --clr-border: rgba(245, 197, 24, 0.18);
            --clr-border-hover: rgba(245, 197, 24, 0.45);
            --clr-glow: rgba(245, 197, 24, 0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.55), 0 0 0 1px var(--clr-border);
            --shadow-card-hover: 0 14px 40px rgba(0, 0, 0, 0.7), 0 0 0 1px var(--clr-border-hover);
            --shadow-glow: 0 0 30px var(--clr-glow);
            --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --font-heading: 'Inter', 'SF Pro Display', 'PingFang SC', sans-serif;
            --transition: 0.28s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --max-width: 1200px;
            --header-h: 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-body);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: var(--clr-primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--clr-primary-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: transparent;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
            color: #fff;
        }

        /* ============================================================
           Container
           ============================================================ */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 18px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
        }

        /* ============================================================
           Header / Nav  — 暗色霓虹风格
           ============================================================ */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: rgba(13, 13, 15, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--clr-border);
            z-index: 1000;
            transition: background var(--transition), border-color var(--transition);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.6);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.02em;
            transition: color var(--transition);
            white-space: nowrap;
        }
        .site-logo i {
            color: var(--clr-primary);
            font-size: 1.6rem;
            filter: drop-shadow(0 0 8px rgba(245, 197, 24, 0.35));
        }
        .site-logo:hover {
            color: var(--clr-primary-light);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            position: relative;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--clr-text-muted);
            transition: color var(--transition), background var(--transition), box-shadow var(--transition);
            white-space: nowrap;
        }
        .main-nav a i {
            font-size: 0.9rem;
        }
        .main-nav a:hover {
            color: #fff;
            background: rgba(245, 197, 24, 0.07);
        }
        .main-nav a.active {
            color: #fff;
            background: rgba(245, 197, 24, 0.12);
            box-shadow: inset 0 -2px 0 var(--clr-primary), 0 0 20px rgba(245, 197, 24, 0.08);
        }
        .main-nav a.active i {
            color: var(--clr-primary);
        }
        .main-nav a.nav-cta {
            background: linear-gradient(135deg, var(--clr-primary-dark), var(--clr-primary));
            color: #0d0d0f;
            font-weight: 600;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 18px rgba(245, 197, 24, 0.2);
            margin-left: 8px;
        }
        .main-nav a.nav-cta:hover {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
            box-shadow: 0 0 30px rgba(245, 197, 24, 0.35);
            color: #0d0d0f;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            cursor: pointer;
            background: transparent;
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-sm);
            transition: border-color var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--clr-text);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle span+span {
            margin-top: 5px;
        }
        .nav-toggle:hover {
            border-color: var(--clr-primary);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        @media (max-width: 820px) {
            .main-nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                width: 100%;
                flex-direction: column;
                background: rgba(13, 13, 15, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                border-bottom: 1px solid var(--clr-border);
                padding: 20px 24px 28px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 14px 18px;
                font-size: 1.05rem;
                border-radius: var(--radius-sm);
                justify-content: flex-start;
            }
            .main-nav a.nav-cta {
                margin-left: 0;
                margin-top: 6px;
                justify-content: center;
            }
            .nav-toggle {
                display: flex;
            }
        }
        @media (max-width: 480px) {
            .site-logo {
                font-size: 1.1rem;
            }
            .site-logo i {
                font-size: 1.3rem;
            }
            .main-nav {
                padding: 16px 16px 22px;
            }
            .main-nav a {
                padding: 12px 14px;
                font-size: 1rem;
            }
        }

        /* ============================================================
           Hero / 内页 Banner
           ============================================================ */
        .page-banner {
            position: relative;
            padding: 140px 0 80px;
            min-height: 360px;
            display: flex;
            align-items: center;
            background: var(--clr-bg-alt) url('/assets/images/backpic/back-1.png') no-repeat center center / cover;
            isolation: isolate;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(13, 13, 15, 0.88) 30%, rgba(13, 13, 15, 0.55) 70%, rgba(245, 197, 24, 0.08) 100%);
            z-index: 0;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
        }
        .page-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            max-width: 760px;
            line-height: 1.2;
            margin-bottom: 18px;
        }
        .page-banner h1 i {
            color: var(--clr-primary);
            filter: drop-shadow(0 0 12px rgba(245, 197, 24, 0.25));
        }
        .page-banner p {
            font-size: 1.2rem;
            color: var(--clr-text-muted);
            max-width: 620px;
            line-height: 1.7;
        }
        .page-banner .banner-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 24px;
        }
        .page-banner .banner-tags span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: rgba(245, 197, 24, 0.12);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-xl);
            font-size: 0.85rem;
            color: var(--clr-primary-light);
            backdrop-filter: blur(4px);
        }
        @media (max-width: 768px) {
            .page-banner {
                padding: 120px 0 56px;
                min-height: 280px;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
            .page-banner p {
                font-size: 1.05rem;
            }
        }
        @media (max-width: 480px) {
            .page-banner h1 {
                font-size: 1.7rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .page-banner .banner-tags span {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
        }

        /* ============================================================
           通用板块
           ============================================================ */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--clr-bg-alt);
        }
        .section-sm {
            padding: 50px 0;
        }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 52px;
        }
        .section-header h2 {
            font-size: 2.4rem;
            margin-bottom: 14px;
            position: relative;
            display: inline-block;
        }
        .section-header h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background: var(--clr-primary);
            border-radius: 4px;
            margin: 14px auto 0;
            box-shadow: 0 0 20px rgba(245, 197, 24, 0.25);
        }
        .section-header p {
            font-size: 1.1rem;
            color: var(--clr-text-muted);
            margin-top: 14px;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-sm {
                padding: 36px 0;
            }
            .section-header h2 {
                font-size: 1.8rem;
            }
            .section-header p {
                font-size: 1rem;
            }
        }
        @media (max-width: 480px) {
            .section {
                padding: 40px 0;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ============================================================
           卡片网格
           ============================================================ */
        .grid-3,
        .grid-4 {
            display: grid;
            gap: 28px;
        }
        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 18px;
            }
        }

        /* 卡片 base */
        .card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            padding: 28px 24px;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card:hover {
            background: var(--clr-bg-card-hover);
            border-color: var(--clr-border-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        .card .card-icon {
            font-size: 2.2rem;
            color: var(--clr-primary);
            margin-bottom: 14px;
            display: inline-block;
            filter: drop-shadow(0 0 12px rgba(245, 197, 24, 0.15));
        }
        .card h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
        }
        .card p {
            color: var(--clr-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: var(--radius-xl);
            background: rgba(245, 197, 24, 0.1);
            color: var(--clr-primary-light);
            font-size: 0.75rem;
            font-weight: 500;
            border: 1px solid rgba(245, 197, 24, 0.2);
            margin-bottom: 12px;
        }
        .card-img {
            border-radius: var(--radius-sm);
            overflow: hidden;
            margin-bottom: 16px;
        }
        .card-img img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img img {
            transform: scale(1.04);
        }

        /* ============================================================
           步骤 / 时间轴
           ============================================================ */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        .step-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            padding: 32px 24px 28px;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .step-item:hover {
            border-color: var(--clr-border-hover);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .step-item::before {
            counter-increment: step;
            content: "0" counter(step);
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 2.2rem;
            font-weight: 800;
            color: rgba(245, 197, 24, 0.08);
            line-height: 1;
            letter-spacing: -0.04em;
        }
        .step-item .step-icon {
            font-size: 2.6rem;
            color: var(--clr-primary);
            margin-bottom: 16px;
            display: inline-block;
            filter: drop-shadow(0 0 14px rgba(245, 197, 24, 0.12));
        }
        .step-item h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
        }
        .step-item p {
            color: var(--clr-text-muted);
            font-size: 0.92rem;
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .step-item {
                padding: 24px 18px 22px;
            }
            .step-item .step-icon {
                font-size: 2rem;
            }
        }

        /* ============================================================
           图文区块
           ============================================================ */
        .split-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .split-block .split-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--clr-border);
        }
        .split-block .split-img img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .split-block .split-img:hover img {
            transform: scale(1.03);
        }
        .split-block .split-text h2 {
            font-size: 2.2rem;
            margin-bottom: 18px;
        }
        .split-block .split-text p {
            font-size: 1.05rem;
            color: var(--clr-text-muted);
            line-height: 1.8;
            margin-bottom: 18px;
        }
        .split-block .split-text .split-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .split-block .split-text .split-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--clr-text-muted);
            font-size: 0.98rem;
        }
        .split-block .split-text .split-list li i {
            color: var(--clr-primary);
            margin-top: 4px;
            font-size: 0.9rem;
        }
        @media (max-width: 820px) {
            .split-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .split-block .split-img img {
                height: 280px;
            }
            .split-block .split-text h2 {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 480px) {
            .split-block {
                gap: 24px;
            }
            .split-block .split-img img {
                height: 200px;
            }
            .split-block .split-text h2 {
                font-size: 1.4rem;
            }
            .split-block .split-text p {
                font-size: 0.95rem;
            }
        }

        /* ============================================================
           FAQ
           ============================================================ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
            box-shadow: var(--shadow-card);
        }
        .faq-item:hover {
            border-color: var(--clr-border-hover);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: #fff;
            background: transparent;
            transition: background var(--transition);
            width: 100%;
            text-align: left;
            border: none;
            gap: 12px;
        }
        .faq-question:hover {
            background: rgba(245, 197, 24, 0.04);
        }
        .faq-question i {
            color: var(--clr-primary);
            font-size: 1rem;
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), padding 0.3s ease;
            padding: 0 24px;
            color: var(--clr-text-muted);
            font-size: 0.98rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 24px 22px;
        }
        @media (max-width: 768px) {
            .faq-question {
                padding: 14px 18px;
                font-size: 0.98rem;
            }
            .faq-answer {
                padding: 0 18px;
                font-size: 0.92rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 18px;
            }
        }

        /* ============================================================
           CTA
           ============================================================ */
        .cta-block {
            background: linear-gradient(135deg, rgba(245, 197, 24, 0.08), rgba(255, 60, 111, 0.05));
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            box-shadow: var(--shadow-card), 0 0 40px rgba(245, 197, 24, 0.04);
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -30%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(245, 197, 24, 0.06), transparent 70%);
            pointer-events: none;
        }
        .cta-block h2 {
            font-size: 2.2rem;
            margin-bottom: 14px;
        }
        .cta-block p {
            font-size: 1.1rem;
            color: var(--clr-text-muted);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-block .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn-primary,
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-size: 1.05rem;
            font-weight: 600;
            transition: all var(--transition);
            cursor: pointer;
            border: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--clr-primary-dark), var(--clr-primary));
            color: #0d0d0f;
            box-shadow: 0 0 24px rgba(245, 197, 24, 0.2);
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
            box-shadow: 0 0 40px rgba(245, 197, 24, 0.35);
            transform: translateY(-2px);
            color: #0d0d0f;
        }
        .btn-outline {
            background: transparent;
            color: var(--clr-text);
            border: 1px solid var(--clr-border);
            backdrop-filter: blur(4px);
        }
        .btn-outline:hover {
            border-color: var(--clr-primary);
            color: var(--clr-primary-light);
            background: rgba(245, 197, 24, 0.05);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .cta-block {
                padding: 40px 28px;
            }
            .cta-block h2 {
                font-size: 1.7rem;
            }
            .cta-block p {
                font-size: 1rem;
            }
            .btn-primary,
            .btn-outline {
                padding: 12px 28px;
                font-size: 0.98rem;
            }
        }
        @media (max-width: 480px) {
            .cta-block {
                padding: 32px 18px;
            }
            .cta-block h2 {
                font-size: 1.4rem;
            }
            .btn-primary,
            .btn-outline {
                padding: 10px 22px;
                font-size: 0.92rem;
                width: 100%;
                justify-content: center;
            }
        }

        /* ============================================================
           统计/数字
           ============================================================ */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .stat-card:hover {
            border-color: var(--clr-border-hover);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .stat-card .stat-num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--clr-primary);
            line-height: 1.1;
            letter-spacing: -0.03em;
            filter: drop-shadow(0 0 12px rgba(245, 197, 24, 0.08));
        }
        .stat-card .stat-label {
            font-size: 0.95rem;
            color: var(--clr-text-muted);
            margin-top: 8px;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-card {
                padding: 24px 16px;
            }
            .stat-card .stat-num {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-card .stat-num {
                font-size: 1.8rem;
            }
        }

        /* ============================================================
           标签 / 徽章
           ============================================================ */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: var(--radius-xl);
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(245, 197, 24, 0.1);
            color: var(--clr-primary-light);
            border: 1px solid rgba(245, 197, 24, 0.2);
        }
        .badge i {
            font-size: 0.7rem;
        }

        /* ============================================================
           搜索/筛选条
           ============================================================ */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            margin-bottom: 36px;
            justify-content: center;
        }
        .filter-bar .filter-btn {
            padding: 8px 22px;
            border-radius: var(--radius-xl);
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition);
        }
        .filter-bar .filter-btn:hover,
        .filter-bar .filter-btn.active {
            background: rgba(245, 197, 24, 0.12);
            border-color: var(--clr-primary);
            color: var(--clr-primary-light);
        }

        /* ============================================================
           Footer — 沿用首页结构
           ============================================================ */
        .site-footer {
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            padding: 60px 0 30px;
            margin-top: 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(245, 197, 24, 0.08);
        }
        .footer-brand .site-logo {
            font-size: 1.3rem;
            margin-bottom: 14px;
            display: inline-flex;
        }
        .footer-brand p {
            color: var(--clr-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .footer-col a {
            display: block;
            color: var(--clr-text-muted);
            font-size: 0.92rem;
            padding: 5px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--clr-primary-light);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 28px;
            gap: 16px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
        }
        .footer-bottom a {
            color: var(--clr-primary-light);
        }
        .footer-socials {
            display: flex;
            gap: 14px;
        }
        .footer-socials a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            border: 1px solid var(--clr-border);
            color: var(--clr-text-muted);
            font-size: 1rem;
            transition: all var(--transition);
        }
        .footer-socials a:hover {
            border-color: var(--clr-primary);
            color: var(--clr-primary);
            background: rgba(245, 197, 24, 0.06);
            transform: translateY(-2px);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-socials {
                justify-content: center;
            }
        }

        /* ============================================================
           辅助
           ============================================================ */
        .text-center {
            text-align: center;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-36 {
            margin-top: 36px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        .fade-in {
            opacity: 0;
            transform: translateY(24px);
            animation: fadeUp 0.7s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in-d1 {
            animation-delay: 0.1s;
        }
        .fade-in-d2 {
            animation-delay: 0.2s;
        }
        .fade-in-d3 {
            animation-delay: 0.3s;
        }
        .fade-in-d4 {
            animation-delay: 0.4s;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --clr-bg: #0a0e17;
            --clr-bg-card: #111827;
            --clr-bg-card-hover: #1a1f2e;
            --clr-bg-alt: #0f1420;
            --clr-primary: #00d4ff;
            --clr-primary-dim: rgba(0, 212, 255, 0.12);
            --clr-secondary: #7c3aed;
            --clr-secondary-dim: rgba(124, 58, 237, 0.12);
            --clr-accent: #f59e0b;
            --clr-accent-dim: rgba(245, 158, 11, 0.15);
            --clr-text: #e2e8f0;
            --clr-text-weak: #94a3b8;
            --clr-text-muted: #64748b;
            --clr-border: rgba(0, 212, 255, 0.15);
            --clr-border-hover: rgba(0, 212, 255, 0.35);
            --clr-glow: rgba(0, 212, 255, 0.25);
            --clr-glow-secondary: rgba(124, 58, 237, 0.25);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 212, 255, 0.06);
            --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 212, 255, 0.18);
            --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.12);
            --shadow-btn: 0 4px 20px rgba(0, 212, 255, 0.25);
            --shadow-btn-hover: 0 6px 30px rgba(0, 212, 255, 0.4);
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== 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-stack);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--clr-primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #66e0ff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: #fff;
        }
        h1 {
            font-size: 2.4rem;
        }
        h2 {
            font-size: 1.8rem;
        }
        h3 {
            font-size: 1.3rem;
        }
        h4 {
            font-size: 1.05rem;
        }
        p {
            margin-bottom: 0.8rem;
            color: var(--clr-text-weak);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-pad {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-title p {
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
            color: var(--clr-text-weak);
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
            border-radius: 4px;
            margin: 14px auto 0;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: rgba(10, 14, 23, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--clr-border);
            z-index: 1000;
            transition: background var(--transition), border-color var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.3px;
            transition: color var(--transition);
        }
        .site-logo i {
            color: var(--clr-primary);
            font-size: 1.5rem;
            filter: drop-shadow(0 0 8px var(--clr-glow));
        }
        .site-logo:hover {
            color: var(--clr-primary);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--clr-text-weak);
            transition: background var(--transition), color var(--transition), box-shadow var(--transition);
            position: relative;
        }
        .main-nav a i {
            font-size: 0.95rem;
        }
        .main-nav a:hover {
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
        }
        .main-nav a.active {
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            box-shadow: inset 0 -2px 0 var(--clr-primary);
        }
        .main-nav a.nav-cta {
            background: linear-gradient(135deg, var(--clr-primary), #00a8cc);
            color: #0a0e17;
            font-weight: 700;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-btn);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .main-nav a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn-hover);
            color: #0a0e17;
            background: linear-gradient(135deg, #33ddff, var(--clr-primary));
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 6px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--clr-text);
            border-radius: 4px;
            transition: transform var(--transition), opacity var(--transition);
        }
        .nav-toggle:hover {
            background: var(--clr-primary-dim);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            padding: 140px 0 80px;
            overflow: hidden;
            background: var(--clr-bg-alt);
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
            mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 80%);
            -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 80%);
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .article-hero .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
            margin-bottom: 24px;
        }
        .article-hero .breadcrumb a {
            color: var(--clr-text-weak);
            transition: color var(--transition);
        }
        .article-hero .breadcrumb a:hover {
            color: var(--clr-primary);
        }
        .article-hero .breadcrumb span {
            color: var(--clr-text-muted);
        }
        .article-hero .breadcrumb i {
            font-size: 0.7rem;
            color: var(--clr-text-muted);
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            max-width: 900px;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff, var(--clr-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .article-hero .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px 32px;
            align-items: center;
            font-size: 0.92rem;
            color: var(--clr-text-weak);
        }
        .article-hero .meta i {
            color: var(--clr-primary);
            margin-right: 6px;
            font-size: 0.85rem;
            opacity: 0.8;
        }
        .article-hero .meta .cat {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* ===== Article Content ===== */
        .article-body {
            padding: 60px 0 80px;
            background: var(--clr-bg);
        }
        .article-body .container {
            max-width: 820px;
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--clr-text-weak);
        }
        .article-body .content h2,
        .article-body .content h3,
        .article-body .content h4 {
            margin-top: 36px;
            margin-bottom: 16px;
            color: #fff;
            font-weight: 700;
        }
        .article-body .content h2 {
            font-size: 1.6rem;
            border-left: 4px solid var(--clr-primary);
            padding-left: 16px;
        }
        .article-body .content h3 {
            font-size: 1.25rem;
        }
        .article-body .content p {
            margin-bottom: 18px;
            color: var(--clr-text-weak);
        }
        .article-body .content a {
            color: var(--clr-primary);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition);
        }
        .article-body .content a:hover {
            border-bottom-color: var(--clr-primary);
        }
        .article-body .content ul,
        .article-body .content ol {
            margin: 18px 0;
            padding-left: 24px;
        }
        .article-body .content ul li {
            list-style: disc;
            margin-bottom: 8px;
            color: var(--clr-text-weak);
        }
        .article-body .content ol li {
            list-style: decimal;
            margin-bottom: 8px;
            color: var(--clr-text-weak);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--clr-secondary);
            background: var(--clr-secondary-dim);
            padding: 18px 24px;
            margin: 24px 0;
            border-radius: var(--radius-sm);
            color: var(--clr-text-weak);
            font-style: normal;
        }
        .article-body .content blockquote p {
            margin-bottom: 0;
        }
        .article-body .content code {
            background: rgba(255, 255, 255, 0.06);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--clr-accent);
        }
        .article-body .content pre {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            overflow-x: auto;
            margin: 24px 0;
        }
        .article-body .content pre code {
            background: none;
            padding: 0;
            color: var(--clr-text-weak);
        }
        .article-body .content img {
            border-radius: var(--radius-md);
            margin: 28px 0;
            box-shadow: var(--shadow-card);
        }
        .article-body .content hr {
            border: none;
            height: 1px;
            background: var(--clr-border);
            margin: 36px 0;
        }
        .article-body .content .highlight {
            background: var(--clr-accent-dim);
            padding: 4px 12px;
            border-radius: 6px;
            color: var(--clr-accent);
            font-weight: 600;
        }
        .article-body .content table {
            width: 100%;
            border-collapse: collapse;
            margin: 28px 0;
            font-size: 0.95rem;
        }
        .article-body .content table th {
            background: var(--clr-bg-card);
            color: #fff;
            font-weight: 600;
            padding: 12px 16px;
            text-align: left;
            border-bottom: 2px solid var(--clr-border);
        }
        .article-body .content table td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--clr-border);
            color: var(--clr-text-weak);
        }
        .article-body .content table tr:hover td {
            background: var(--clr-bg-card-hover);
        }

        /* ===== Article Not Found ===== */
        .article-not-found {
            padding: 100px 0;
            text-align: center;
        }
        .article-not-found i {
            font-size: 4rem;
            color: var(--clr-text-muted);
            margin-bottom: 24px;
            opacity: 0.5;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
            color: var(--clr-text);
        }
        .article-not-found p {
            color: var(--clr-text-weak);
            margin-bottom: 24px;
            font-size: 1.05rem;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .article-not-found .btn-back:hover {
            background: rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }

        /* ===== Related Posts ===== */
        .related-posts {
            padding: 60px 0 80px;
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
        }
        .related-posts .section-title {
            margin-bottom: 40px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }
        .related-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--clr-border-hover);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--clr-bg-card-hover);
        }
        .related-card .card-body {
            padding: 20px;
        }
        .related-card .card-body .cat {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--clr-primary);
            background: var(--clr-primary-dim);
            padding: 2px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
        }
        .related-card .card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: #fff;
            line-height: 1.4;
        }
        .related-card .card-body h3 a {
            color: #fff;
            transition: color var(--transition);
        }
        .related-card .card-body h3 a:hover {
            color: var(--clr-primary);
        }
        .related-card .card-body p {
            font-size: 0.88rem;
            color: var(--clr-text-weak);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .date {
            font-size: 0.8rem;
            color: var(--clr-text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .related-card .card-body .date i {
            font-size: 0.75rem;
            color: var(--clr-primary);
            opacity: 0.7;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 70px 0 80px;
            background: var(--clr-bg);
        }
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-border-hover);
            box-shadow: var(--shadow-glow);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: #fff;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 12px;
            list-style: none;
            transition: background var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::before {
            content: '\f059';
            font-family: 'Font Awesome 6 Free';
            font-weight: 400;
            color: var(--clr-primary);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .faq-item summary::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            margin-left: auto;
            color: var(--clr-text-muted);
            transition: transform var(--transition);
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item[open] summary {
            background: var(--clr-primary-dim);
            border-bottom: 1px solid var(--clr-border);
        }
        .faq-item .answer {
            padding: 18px 24px 22px;
            color: var(--clr-text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item .answer p:last-child {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 212, 255, 0.06), transparent 70%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff, var(--clr-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .cta-section p {
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
            color: var(--clr-text-weak);
        }
        .cta-section .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 44px;
            background: linear-gradient(135deg, var(--clr-primary), #00a8cc);
            color: #0a0e17;
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            border-radius: var(--radius-sm);
            cursor: pointer;
            box-shadow: var(--shadow-btn);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .cta-section .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-btn-hover);
            color: #0a0e17;
        }
        .cta-section .btn-primary i {
            font-size: 1.1rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #070b12;
            border-top: 1px solid var(--clr-border);
            padding: 60px 0 30px;
            color: var(--clr-text-weak);
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .site-footer .footer-brand .site-logo {
            font-size: 1.2rem;
            color: #fff;
        }
        .site-footer .footer-brand .site-logo i {
            color: var(--clr-primary);
        }
        .site-footer .footer-brand p {
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            margin-top: 12px;
            max-width: 340px;
            line-height: 1.6;
        }
        .site-footer .footer-col h4 {
            font-size: 0.95rem;
            color: #fff;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .site-footer .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: var(--clr-text-muted);
            padding: 5px 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        .site-footer .footer-col a:hover {
            color: var(--clr-primary);
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding-top: 28px;
            font-size: 0.82rem;
            color: var(--clr-text-muted);
            gap: 16px;
        }
        .site-footer .footer-bottom a {
            color: var(--clr-text-weak);
            transition: color var(--transition);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--clr-primary);
        }
        .site-footer .footer-socials {
            display: flex;
            gap: 12px;
        }
        .site-footer .footer-socials a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            color: var(--clr-text-muted);
            font-size: 1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .site-footer .footer-socials a:hover {
            background: var(--clr-primary-dim);
            color: var(--clr-primary);
            transform: translateY(-2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .site-footer .footer-brand {
                grid-column: 1 / -1;
            }
            .article-hero h1 {
                font-size: 2.1rem;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 18px;
            }
            .section-pad {
                padding: 50px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }

            /* Nav */
            .main-nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(10, 14, 23, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 6px;
                border-bottom: 1px solid var(--clr-border);
                transform: translateY(-110%);
                opacity: 0;
                transition: transform 0.35s ease, opacity 0.25s ease;
                pointer-events: none;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 18px;
                font-size: 1rem;
            }
            .main-nav a.nav-cta {
                text-align: center;
                justify-content: center;
                margin-top: 6px;
            }
            .nav-toggle {
                display: flex;
            }

            .article-hero {
                padding: 120px 0 50px;
            }
            .article-hero h1 {
                font-size: 1.7rem;
            }
            .article-hero .meta {
                gap: 12px 20px;
                font-size: 0.85rem;
            }

            .article-body .content {
                font-size: 0.98rem;
            }
            .article-body .content h2 {
                font-size: 1.35rem;
            }
            .article-body .content h3 {
                font-size: 1.1rem;
            }

            .related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .related-card .card-img {
                height: 140px;
            }

            .faq-item summary {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-item .answer {
                padding: 14px 18px 18px;
                font-size: 0.9rem;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .btn-primary {
                padding: 14px 32px;
                font-size: 0.95rem;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 1.4rem;
            }
            .article-hero .meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-card .card-img {
                height: 180px;
            }
            .article-body .content h2 {
                font-size: 1.2rem;
                padding-left: 12px;
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 400px) {
            .site-logo {
                font-size: 1.1rem;
            }
            .site-logo i {
                font-size: 1.2rem;
            }
            .article-hero h1 {
                font-size: 1.25rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }