/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f0e3a;
            --primary-light: #1f1d5e;
            --primary-dark: #080724;
            --secondary: #6c5ce7;
            --secondary-light: #a29bfe;
            --accent: #00d2ff;
            --accent-dark: #0098b3;
            --gold: #ffd54f;
            --gold-light: #ffe082;
            --bg-dark: #0a0818;
            --bg-card: #ffffff;
            --bg-card-hover: #f8f7ff;
            --bg-section: #f5f4fb;
            --bg-section-alt: #0f0e3a;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #8888a8;
            --text-inverse: #ffffff;
            --text-muted: #b0b0c8;
            --border: #e8e8f0;
            --border-light: #f0eff5;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 30px rgba(108,92,231,0.15);
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-dark);
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
        h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
        h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
        p { margin-bottom: 0.8rem; }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== Utility ===== */
        .section-padding { padding: 80px 0; }
        @media (max-width: 768px) { .section-padding { padding: 56px 0; } }
        .text-center { text-align: center; }
        .text-gradient {
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--secondary);
            background: rgba(108,92,231,0.1);
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 16px;
        }
        .section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 40px;
            line-height: 1.6;
        }
        .dark-section .section-title { color: var(--text-inverse); }
        .dark-section .section-subtitle { color: var(--text-muted); }
        .dark-section .section-label { background: rgba(255,255,255,0.08); color: var(--accent); }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--secondary), var(--accent-dark));
            color: #fff;
            border-color: transparent;
            box-shadow: 0 4px 16px rgba(108,92,231,0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(108,92,231,0.4);
        }
        .btn-primary:active { transform: translateY(0); }
        .btn-secondary {
            background: rgba(255,255,255,0.08);
            color: var(--text-inverse);
            border-color: rgba(255,255,255,0.2);
            backdrop-filter: blur(8px);
        }
        .btn-secondary:hover {
            background: rgba(255,255,255,0.16);
            border-color: rgba(255,255,255,0.3);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--secondary);
            border-color: var(--secondary);
        }
        .btn-outline:hover {
            background: var(--secondary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; border-radius: var(--radius); }
        .btn i { font-size: 1.1em; }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(10,8,24,0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: background var(--transition), border-color var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10,8,24,0.96);
            border-bottom-color: rgba(255,255,255,0.1);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 16px;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--text-inverse);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .header-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: #fff;
            box-shadow: 0 0 20px rgba(108,92,231,0.3);
        }
        .header-logo span { background: linear-gradient(135deg, #fff 60%, var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .header-nav a {
            padding: 8px 18px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            position: relative;
        }
        .header-nav a:hover { color: var(--text-inverse); background: rgba(255,255,255,0.06); }
        .header-nav a.active {
            color: var(--text-inverse);
            background: rgba(108,92,231,0.15);
        }
        .header-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--secondary);
            border-radius: 4px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .header-search {
            display: flex;
            align-items: center;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--radius-sm);
            padding: 0 12px;
            height: 38px;
            width: 200px;
            transition: all var(--transition);
        }
        .header-search:focus-within {
            border-color: var(--secondary);
            background: rgba(255,255,255,0.1);
            box-shadow: 0 0 20px rgba(108,92,231,0.1);
        }
        .header-search i { color: var(--text-muted); font-size: 0.85rem; }
        .header-search input {
            background: transparent;
            border: none;
            color: var(--text-inverse);
            padding: 0 8px;
            width: 100%;
            font-size: 0.85rem;
        }
        .header-search input::placeholder { color: var(--text-muted); }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            color: var(--text-inverse);
            font-size: 1.4rem;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-toggle:hover { background: rgba(255,255,255,0.06); }

        @media (max-width: 900px) {
            .header-nav { display: none; }
            .header-search { display: none; }
            .mobile-toggle { display: flex; }
            .mobile-nav-open .header-nav {
                display: flex;
                flex-direction: column;
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(10,8,24,0.98);
                backdrop-filter: blur(20px);
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid rgba(255,255,255,0.06);
                box-shadow: 0 20px 60px rgba(0,0,0,0.4);
            }
            .mobile-nav-open .header-nav a { padding: 12px 16px; font-size: 1rem; width: 100%; }
            .mobile-nav-open .header-nav a.active::after { display: none; }
            .mobile-nav-open .header-actions .btn { display: none; }
        }
        @media (max-width: 520px) {
            .header-logo { font-size: 1.1rem; }
            .header-logo .logo-icon { width: 32px; height: 32px; font-size: 1rem; }
            .header-actions .btn { padding: 8px 16px; font-size: 0.8rem; }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--header-height);
            overflow: hidden;
            background: var(--bg-dark);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.3;
            z-index: 0;
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10,8,24,0.92) 30%, rgba(15,14,58,0.7) 70%, rgba(0,210,255,0.08) 100%);
            z-index: 1;
        }
        .hero .container { position: relative; z-index: 2; padding-top: 40px; padding-bottom: 60px; }
        .hero-content { max-width: 720px; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(108,92,231,0.15);
            border: 1px solid rgba(108,92,231,0.2);
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.8rem;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero h1 {
            font-size: clamp(2.4rem, 6vw, 4.2rem);
            font-weight: 800;
            color: var(--text-inverse);
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .hero h1 .highlight { background: linear-gradient(135deg, var(--secondary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: clamp(1rem, 2vw, 1.2rem);
            color: var(--text-muted);
            max-width: 560px;
            line-height: 1.7;
            margin-bottom: 36px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .hero-stats {
            display: flex;
            gap: 32px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .hero-stat h3 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-inverse);
        }
        .hero-stat h3 span { color: var(--accent); }
        .hero-stat p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 0;
        }
        @media (max-width: 768px) {
            .hero { min-height: auto; padding-top: var(--header-height); }
            .hero-content { text-align: center; }
            .hero h1 { font-size: clamp(1.8rem, 7vw, 2.6rem); }
            .hero p { margin-left: auto; margin-right: auto; }
            .hero-actions { justify-content: center; }
            .hero-stats { justify-content: center; flex-wrap: wrap; gap: 24px; }
        }
        @media (max-width: 520px) {
            .hero-stats { flex-direction: column; align-items: center; gap: 16px; }
            .hero-stat { text-align: center; }
        }

        /* ===== Features / 核心优势 ===== */
        .features-section {
            background: var(--bg-section);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(108,92,231,0.15);
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--secondary), var(--accent));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .feature-card:hover::before { opacity: 1; }
        .feature-icon {
            width: 52px;
            height: 52px;
            background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(0,210,255,0.1));
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--secondary);
            margin-bottom: 20px;
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: linear-gradient(135deg, var(--secondary), var(--accent-dark));
            color: #fff;
            box-shadow: 0 0 30px rgba(108,92,231,0.2);
        }
        .feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
        .feature-card p { color: var(--text-secondary); font-size: 0.92rem; margin: 0; line-height: 1.6; }
        @media (max-width: 768px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
        }
        @media (max-width: 520px) {
            .features-grid { grid-template-columns: 1fr; }
            .feature-card { padding: 28px 20px; }
        }

        /* ===== Functions / 平台功能 ===== */
        .functions-section {
            background: var(--bg-card);
        }
        .functions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .func-card {
            background: var(--bg-section);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            text-align: center;
        }
        .func-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: rgba(108,92,231,0.12);
        }
        .func-card .func-icon {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--accent);
        }
        .func-card h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
        .func-card p { color: var(--text-secondary); font-size: 0.88rem; margin: 0; line-height: 1.6; }
        @media (max-width: 768px) {
            .functions-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .functions-grid { grid-template-columns: 1fr; }
        }

        /* ===== Category / 分类入口 ===== */
        .category-section {
            background: var(--bg-section);
        }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card .cat-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .category-card .cat-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .category-card:hover .cat-img img { transform: scale(1.05); }
        .category-card .cat-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10,8,24,0.5), transparent);
        }
        .category-card .cat-body {
            padding: 24px 28px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .cat-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--secondary);
            background: rgba(108,92,231,0.08);
            padding: 2px 12px;
            border-radius: 12px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .category-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
        .category-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; margin-bottom: 16px; flex: 1; }
        .category-card .cat-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--secondary);
            transition: gap var(--transition);
        }
        .category-card .cat-link i { font-size: 0.8rem; transition: transform var(--transition); }
        .category-card .cat-link:hover i { transform: translateX(4px); }
        @media (max-width: 768px) {
            .category-grid { grid-template-columns: 1fr; }
        }

        /* ===== Latest Posts / 最新资讯 ===== */
        .posts-section {
            background: var(--bg-card);
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .post-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: rgba(108,92,231,0.1);
        }
        .post-card .post-img {
            height: 180px;
            overflow: hidden;
            position: relative;
            background: var(--bg-section);
        }
        .post-card .post-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .post-card:hover .post-img img { transform: scale(1.05); }
        .post-card .post-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--text-light);
            margin-bottom: 10px;
        }
        .post-card .post-meta .cat-badge {
            background: rgba(108,92,231,0.08);
            color: var(--secondary);
            padding: 1px 10px;
            border-radius: 10px;
            font-weight: 500;
        }
        .post-card h4 {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card h4 a { color: var(--text-primary); }
        .post-card h4 a:hover { color: var(--secondary); }
        .post-card .post-excerpt {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .post-card .post-readmore {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--secondary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .post-card .post-readmore i { font-size: 0.75rem; transition: transform var(--transition); }
        .post-card .post-readmore:hover i { transform: translateX(4px); }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-light);
            font-size: 1rem;
            background: var(--bg-section);
            border-radius: var(--radius);
        }
        .posts-empty i { font-size: 2rem; color: var(--text-muted); margin-bottom: 16px; display: block; }
        @media (max-width: 768px) {
            .posts-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .posts-grid { grid-template-columns: 1fr; }
        }

        /* ===== Data / 平台数据 ===== */
        .data-section {
            background: var(--bg-section-alt);
            position: relative;
            overflow: hidden;
        }
        .data-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.06;
            z-index: 0;
        }
        .data-section .container { position: relative; z-index: 1; }
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .data-item {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius);
            border: 1px solid rgba(255,255,255,0.04);
            transition: all var(--transition);
        }
        .data-item:hover {
            background: rgba(255,255,255,0.06);
            border-color: rgba(255,255,255,0.08);
        }
        .data-item .data-number {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 800;
            color: var(--text-inverse);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .data-item .data-number span { color: var(--accent); }
        .data-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
        }
        @media (max-width: 768px) {
            .data-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
        }
        @media (max-width: 520px) {
            .data-grid { grid-template-columns: 1fr; }
        }

        /* ===== Process / 使用流程 ===== */
        .process-section {
            background: var(--bg-card);
        }
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 36px;
            left: 60px;
            right: 60px;
            height: 2px;
            background: linear-gradient(90deg, var(--secondary), var(--accent), var(--secondary));
            opacity: 0.2;
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .step-number {
            width: 72px;
            height: 72px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent);
            border: 2px solid rgba(108,92,231,0.15);
            transition: all var(--transition);
        }
        .step-item:hover .step-number {
            border-color: var(--secondary);
            box-shadow: 0 0 30px rgba(108,92,231,0.2);
        }
        .step-item h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
        .step-item p { color: var(--text-secondary); font-size: 0.88rem; margin: 0; line-height: 1.6; }
        @media (max-width: 768px) {
            .process-steps { grid-template-columns: repeat(2, 1fr); }
            .process-steps::before { display: none; }
        }
        @media (max-width: 520px) {
            .process-steps { grid-template-columns: 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-section);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: rgba(108,92,231,0.12); }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            text-align: left;
            background: transparent;
            transition: background var(--transition);
        }
        .faq-question:hover { background: rgba(108,92,231,0.02); }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-light);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--secondary); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
            margin: 0;
        }
        @media (max-width: 520px) {
            .faq-question { padding: 14px 18px; font-size: 0.92rem; }
            .faq-answer { padding: 0 18px; }
            .faq-item.open .faq-answer { padding: 0 18px 16px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-section-alt);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.05;
            z-index: 0;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-box {
            background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(0,210,255,0.04));
            border: 1px solid rgba(108,92,231,0.1);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }
        .cta-box h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            color: var(--text-inverse);
            margin-bottom: 16px;
        }
        .cta-box p {
            color: var(--text-muted);
            max-width: 520px;
            margin: 0 auto 32px;
            font-size: 1rem;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        @media (max-width: 520px) {
            .cta-box { padding: 40px 24px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            border-top: 1px solid rgba(255,255,255,0.04);
            padding: 48px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.04);
            margin-bottom: 24px;
        }
        .footer-brand .footer-logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-inverse);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }
        .footer-brand .footer-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.7;
            max-width: 320px;
            margin: 0;
        }
        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-inverse);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.88rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: var(--accent); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin: 0;
        }
        .footer-bottom .footer-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom .footer-links a {
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-bottom .footer-links a:hover { color: var(--accent); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--bg-dark); }
        ::-webkit-scrollbar-thumb { background: rgba(108,92,231,0.3); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: rgba(108,92,231,0.5); }

        /* ===== Focus ===== */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        /* ===== Animations ===== */
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fade-up { animation: fadeUp 0.8s ease forwards; }
        .animate-delay-1 { animation-delay: 0.1s; }
        .animate-delay-2 { animation-delay: 0.2s; }
        .animate-delay-3 { animation-delay: 0.3s; }
        .animate-delay-4 { animation-delay: 0.4s; }

/* roulang page: category1 */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-light: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0,0,0,0.3);
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  body{font-family:'Inter',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;background:#0b1120;color:var(--text-light);line-height:1.7;}
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;height:auto;display:block;}
  .container{max-width:1200px;margin:0 auto;padding:0 20px;}
  
  /* Header */
  .site-header{position:sticky;top:0;z-index:100;background:rgba(15,23,42,0.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--border-color);}
  .header-inner{display:flex;align-items:center;justify-content:space-between;height:70px;}
  .logo{display:flex;align-items:center;gap:10px;font-size:1.3rem;font-weight:700;color:#fff;}
  .logo i{color:var(--secondary);}
  .header-nav{display:flex;align-items:center;gap:32px;}
  .header-nav a{font-size:0.95rem;color:var(--text-muted);padding:6px 0;border-bottom:2px solid transparent;transition:color 0.2s,border-color 0.2s;font-weight:500;}
  .header-nav a:hover,.header-nav a.active{color:#fff;border-bottom-color:var(--secondary);}
  .header-right{display:flex;align-items:center;gap:16px;}
  .search-btn{background:rgba(99,102,241,0.12);border:1px solid var(--border-color);border-radius:30px;padding:8px 18px;color:var(--text-muted);display:flex;align-items:center;gap:8px;font-size:0.85rem;cursor:pointer;transition:0.2s;}
  .search-btn:hover,.search-btn:focus{border-color:var(--primary);color:#fff;outline:none;}
  .cta-btn{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;padding:10px 24px;border-radius:30px;font-weight:600;font-size:0.9rem;border:none;cursor:pointer;transition:transform 0.2s,box-shadow 0.2s;}
  .cta-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(99,102,241,0.4);}
  
  /* Mobile nav */
  .mobile-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;}
  @media (max-width:768px){
    .header-nav{display:none;position:absolute;top:70px;left:0;right:0;background:rgba(15,23,42,0.98);flex-direction:column;padding:20px;gap:18px;border-bottom:1px solid var(--border-color);}
    .header-nav.open{display:flex;}
    .header-nav a{border-bottom:none;padding:8px 0;font-size:1.05rem;}
    .header-right .search-btn span{display:none;}
    .mobile-toggle{display:block;}
    .header-right .cta-btn{padding:8px 18px;font-size:0.8rem;}
  }
  
  /* Page banner */
  .page-banner{background:linear-gradient(135deg,#0f172a 0%,#1e293b 100%);padding:80px 0 60px;text-align:center;border-bottom:1px solid var(--border-color);position:relative;overflow:hidden;}
  .page-banner::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;opacity:0.15;pointer-events:none;}
  .page-banner h1{font-size:2.8rem;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,#e2e8f0,#818cf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
  .page-banner p{font-size:1.15rem;color:var(--text-muted);max-width:700px;margin:0 auto;line-height:1.8;}
  .breadcrumb{display:flex;justify-content:center;gap:12px;margin-bottom:24px;font-size:0.9rem;color:var(--text-muted);}
  .breadcrumb a{color:var(--secondary);}
  .breadcrumb a:hover{color:#fff;}
  
  /* Sections */
  .section{padding:80px 0;}
  .section-title{text-align:center;margin-bottom:50px;}
  .section-title h2{font-size:2.2rem;font-weight:700;margin-bottom:12px;}
  .section-title p{color:var(--text-muted);font-size:1.05rem;max-width:600px;margin:0 auto;}
  
  /* Cards */
  .card{background:var(--bg-card);border-radius:var(--radius);padding:32px;border:1px solid var(--border-color);transition:transform 0.3s,box-shadow 0.3s;}
  .card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(0,0,0,0.4);}
  .card-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.6rem;margin-bottom:18px;background:rgba(99,102,241,0.15);color:var(--primary);}
  .card h3{font-size:1.25rem;font-weight:600;margin-bottom:10px;}
  .card p{color:var(--text-muted);font-size:0.95rem;}
  
  /* Steps */
  .step-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:30px;counter-reset:step;}
  .step-card{background:var(--bg-card);border-radius:var(--radius);padding:30px;border:1px solid var(--border-color);position:relative;text-align:center;transition:0.3s;}
  .step-card:hover{border-color:var(--primary);}
  .step-card::before{counter-increment:step;content:"0" counter(step);position:absolute;top:-12px;left:20px;background:var(--primary);color:#fff;font-weight:700;font-size:0.85rem;padding:4px 12px;border-radius:20px;}
  .step-card h3{font-size:1.2rem;font-weight:600;margin:10px 0 8px;}
  .step-card p{color:var(--text-muted);font-size:0.9rem;}
  
  /* Function features */
  .func-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;}
  
  /* FAQ */
  .faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px;}
  .faq-item{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border-color);overflow:hidden;}
  .faq-question{width:100%;background:none;border:none;color:#fff;font-size:1.05rem;font-weight:500;padding:18px 24px;text-align:left;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:10px;}
  .faq-question i{transition:transform 0.3s;color:var(--primary);}
  .faq-item.active .faq-question i{transform:rotate(180deg);}
  .faq-answer{padding:0 24px 20px;color:var(--text-muted);font-size:0.95rem;display:none;line-height:1.7;}
  .faq-item.active .faq-answer{display:block;}
  
  /* CTA */
  .cta-section{background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:24px;padding:60px 40px;text-align:center;margin:40px 0;}
  .cta-section h2{font-size:2.2rem;font-weight:700;margin-bottom:14px;}
  .cta-section p{font-size:1.1rem;opacity:0.95;margin-bottom:30px;}
  .cta-section .btn-light{background:#fff;color:var(--primary);padding:14px 36px;border-radius:40px;font-weight:700;font-size:1.05rem;display:inline-block;transition:0.2s;}
  .cta-section .btn-light:hover{transform:scale(1.05);box-shadow:0 8px 30px rgba(0,0,0,0.25);}
  
  /* Footer */
  .site-footer{background:#0a0f1e;border-top:1px solid var(--border-color);padding:60px 0 30px;}
  .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;}
  .footer-logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;margin-bottom:14px;}
  .footer-logo i{color:var(--secondary);}
  .footer-brand p{color:var(--text-muted);font-size:0.92rem;max-width:320px;line-height:1.7;}
  .footer-col h5{font-size:1rem;font-weight:600;margin-bottom:16px;color:#e2e8f0;}
  .footer-col ul{list-style:none;display:flex;flex-direction:column;gap:10px;}
  .footer-col ul a{color:var(--text-muted);font-size:0.9rem;transition:color 0.2s;}
  .footer-col ul a:hover{color:#fff;}
  .footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:30px;border-top:1px solid var(--border-color);font-size:0.85rem;color:var(--text-muted);}
  .footer-bottom .footer-links{display:flex;gap:20px;}
  .footer-bottom .footer-links a{color:var(--text-muted);transition:color 0.2s;}
  .footer-bottom .footer-links a:hover{color:#fff;}
  @media (max-width:768px){
    .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
    .footer-bottom{flex-direction:column;gap:12px;text-align:center;}
    .page-banner h1{font-size:2rem;}
    .page-banner{padding:60px 0 40px;}
    .section{padding:50px 0;}
    .section-title h2{font-size:1.7rem;}
  }
  @media (max-width:520px){
    .footer-grid{grid-template-columns:1fr;}
    .header-inner{padding:0 12px;}
    .header-right .search-btn{padding:8px 12px;}
  }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2b3b7a;
            --primary-light: #3d5a9e;
            --primary-dark: #1a274d;
            --secondary: #e8a838;
            --secondary-light: #f0c060;
            --secondary-dark: #c88a20;
            --accent: #5bc0de;
            --bg-dark: #0b1120;
            --bg-mid: #141c30;
            --bg-card: #1a2540;
            --bg-card-hover: #1f2d50;
            --bg-body: #0a0f1e;
            --text-primary: #f0f4ff;
            --text-secondary: #c8d4f0;
            --text-muted: #8899bb;
            --text-inverse: #0b1120;
            --border-color: #2a3a60;
            --border-light: #3a4a70;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.4);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 30px rgba(232,168,56,0.15);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --transition: 0.28s cubic-bezier(0.22, 1, 0.36, 1);
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--secondary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--secondary-light); }
        a:focus-visible { outline: 2px solid var(--secondary); outline-offset: 3px; border-radius: 4px; }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: 1rem; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 600; letter-spacing: -0.01em; }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 640px) {
            .container { padding: 0 16px; }
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(11, 17, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-color);
            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%;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
        }
        .header-logo .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-inverse);
            font-size: 1.2rem;
            box-shadow: 0 0 20px rgba(232,168,56,0.25);
        }
        .header-logo span:last-child { background: linear-gradient(135deg, var(--text-primary), var(--secondary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .header-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: background var(--transition), color var(--transition);
            position: relative;
        }
        .header-nav a:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }
        .header-nav a.active { color: var(--secondary); background: rgba(232,168,56,0.12); }
        .header-nav a.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 20px; height: 2px; background: var(--secondary); border-radius: 2px; }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: rgba(255,255,255,0.06);
            border: 1px solid var(--border-color);
            border-radius: 40px;
            padding: 6px 16px 6px 18px;
            transition: border-color var(--transition), background var(--transition);
            max-width: 200px;
        }
        .search-box:focus-within { border-color: var(--secondary); background: rgba(232,168,56,0.06); }
        .search-box input { background: none; border: none; color: var(--text-primary); padding: 6px 0; font-size: 0.9rem; width: 120px; }
        .search-box input::placeholder { color: var(--text-muted); }
        .search-box button { color: var(--text-muted); font-size: 0.9rem; padding: 4px 0 4px 8px; transition: color var(--transition); }
        .search-box button:hover { color: var(--secondary); }
        .header-cta {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: var(--text-inverse);
            padding: 10px 26px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 16px rgba(232,168,56,0.25);
        }
        .header-cta:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 8px 28px rgba(232,168,56,0.35); color: var(--text-inverse); }
        .mobile-toggle { display: none; font-size: 1.5rem; color: var(--text-primary); background: none; border: none; padding: 6px; }

        @media (max-width: 868px) {
            .header-nav { display: none; position: absolute; top: var(--header-height); left: 0; width: 100%; background: rgba(11,17,32,0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 16px 24px 24px; border-bottom: 1px solid var(--border-color); gap: 4px; }
            .header-nav.open { display: flex; }
            .header-nav a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .header-nav a.active::after { display: none; }
            .header-nav a.active { background: rgba(232,168,56,0.15); }
            .mobile-toggle { display: block; }
            .header-actions .search-box { display: none; }
            .header-cta { padding: 8px 18px; font-size: 0.85rem; }
        }
        @media (max-width: 520px) {
            .header-logo { font-size: 1.15rem; }
            .header-logo .logo-icon { width: 32px; height: 32px; font-size: 1rem; }
            .header-cta { padding: 6px 14px; font-size: 0.8rem; }
        }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 120px 0 50px;
            background: linear-gradient(160deg, var(--bg-dark) 0%, var(--bg-mid) 60%, #0d1a30 100%);
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(232,168,56,0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a { color: var(--text-muted); }
        .article-breadcrumb a:hover { color: var(--secondary); }
        .article-breadcrumb .sep { color: var(--border-light); }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 700;
            color: var(--text-primary);
            max-width: 860px;
            line-height: 1.25;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            align-items: center;
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 8px;
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i { font-size: 0.85rem; color: var(--secondary); }
        .article-meta .badge-cat {
            background: rgba(232,168,56,0.15);
            color: var(--secondary-light);
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        @media (max-width: 768px) {
            .article-hero { padding: 100px 0 36px; }
            .article-hero h1 { font-size: 1.8rem; }
            .article-meta { gap: 12px; font-size: 0.85rem; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 1.5rem; }
            .article-breadcrumb { font-size: 0.8rem; }
        }

        /* ===== Article Content ===== */
        .article-main {
            padding: 50px 0 70px;
            background: var(--bg-body);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            box-shadow: var(--shadow-sm);
        }
        .article-body .article-cover {
            width: 100%;
            border-radius: var(--radius-md);
            margin-bottom: 30px;
            object-fit: cover;
            max-height: 420px;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content-text {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
        }
        .article-body .content-text p {
            margin-bottom: 1.4em;
        }
        .article-body .content-text h2 {
            font-size: 1.6rem;
            color: var(--text-primary);
            margin-top: 1.8em;
            margin-bottom: 0.6em;
        }
        .article-body .content-text h3 {
            font-size: 1.25rem;
            color: var(--text-primary);
            margin-top: 1.4em;
            margin-bottom: 0.4em;
        }
        .article-body .content-text ul, .article-body .content-text ol {
            padding-left: 1.5em;
            margin-bottom: 1.2em;
        }
        .article-body .content-text li {
            margin-bottom: 0.5em;
            list-style: disc;
        }
        .article-body .content-text a { color: var(--secondary-light); text-decoration: underline; text-underline-offset: 3px; }
        .article-body .content-text a:hover { color: var(--secondary); }
        .article-body .content-text blockquote {
            border-left: 4px solid var(--secondary);
            padding: 16px 22px;
            background: rgba(232,168,56,0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.5em 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content-text img {
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-not-found {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
        }
        .article-not-found i { font-size: 3rem; color: var(--border-light); margin-bottom: 20px; }
        .article-not-found h2 { font-size: 1.6rem; color: var(--text-primary); margin-bottom: 12px; }
        .article-not-found p { font-size: 1rem; margin-bottom: 24px; }
        .article-not-found .btn-back {
            display: inline-block;
            background: var(--secondary);
            color: var(--text-inverse);
            padding: 12px 32px;
            border-radius: 40px;
            font-weight: 600;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .article-not-found .btn-back:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.3); color: var(--text-inverse); }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 22px;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h4 {
            font-size: 1.05rem;
            color: var(--text-primary);
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h4 i { color: var(--secondary); font-size: 1rem; }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid rgba(255,255,255,0.04);
        }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            color: var(--text-secondary);
            font-size: 0.92rem;
            display: flex;
            align-items: flex-start;
            gap: 8px;
            transition: color var(--transition);
        }
        .sidebar-list a:hover { color: var(--secondary-light); }
        .sidebar-list a i { color: var(--secondary); font-size: 0.75rem; margin-top: 4px; flex-shrink: 0; }
        .sidebar-list .list-date {
            font-size: 0.75rem;
            color: var(--text-muted);
            display: block;
            margin-top: 2px;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags a {
            background: rgba(255,255,255,0.04);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 40px;
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }
        .sidebar-tags a:hover { background: rgba(232,168,56,0.1); border-color: var(--secondary); color: var(--secondary-light); }
        .sidebar-cta-box {
            background: linear-gradient(145deg, var(--bg-card), var(--bg-mid));
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            text-align: center;
        }
        .sidebar-cta-box h4 { color: var(--text-primary); margin-bottom: 8px; }
        .sidebar-cta-box p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 18px; }
        .sidebar-cta-box .btn-cta {
            display: inline-block;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: var(--text-inverse);
            padding: 12px 34px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 16px rgba(232,168,56,0.2);
        }
        .sidebar-cta-box .btn-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(232,168,56,0.3); color: var(--text-inverse); }

        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; gap: 32px; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
            .sidebar-cta-box { grid-column: 1 / -1; }
        }
        @media (max-width: 640px) {
            .article-body { padding: 24px 18px; }
            .article-sidebar { grid-template-columns: 1fr; }
        }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 50px 0 70px;
            background: var(--bg-mid);
            border-top: 1px solid var(--border-color);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .related-section .section-sub {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 36px;
            font-size: 1rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 18px 20px 22px;
        }
        .related-card .card-body h3 {
            font-size: 1.05rem;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card .card-body h3 a { color: var(--text-primary); }
        .related-card .card-body h3 a:hover { color: var(--secondary-light); }
        .related-card .card-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .related-card .card-meta .cat-tag {
            background: rgba(232,168,56,0.12);
            color: var(--secondary-light);
            padding: 2px 12px;
            border-radius: 40px;
            font-size: 0.75rem;
        }

        @media (max-width: 868px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .related-grid { grid-template-columns: 1fr; }
            .related-section .section-title { font-size: 1.4rem; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-color);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }
        .footer-brand .footer-logo .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-inverse);
            font-size: 1rem;
        }
        .footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 320px; line-height: 1.7; }
        .footer-col h5 {
            color: var(--text-primary);
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.88rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: var(--secondary-light); }
        .footer-col ul li a i { margin-right: 6px; font-size: 0.8rem; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            font-size: 0.84rem;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom .footer-links { display: flex; gap: 18px; }
        .footer-bottom .footer-links a { color: var(--text-muted); font-size: 0.84rem; }
        .footer-bottom .footer-links a:hover { color: var(--secondary-light); }

        @media (max-width: 868px) {
            .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-bottom .footer-links { justify-content: center; }
        }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            width: 48px;
            height: 48px;
            background: var(--secondary);
            color: var(--text-inverse);
            border: none;
            border-radius: 50%;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 20px rgba(232,168,56,0.25);
            transition: transform var(--transition), box-shadow var(--transition);
            z-index: 900;
            opacity: 0;
            pointer-events: none;
        }
        .back-top.visible { opacity: 1; pointer-events: auto; }
        .back-top:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(232,168,56,0.35); }

        @media (max-width: 520px) {
            .back-top { bottom: 18px; right: 18px; width: 42px; height: 42px; font-size: 1rem; }
        }

        /* ===== Responsive Utilities ===== */
        @media (max-width: 640px) {
            .hide-mobile { display: none !important; }
        }
        @media (min-width: 641px) {
            .show-mobile { display: none !important; }
        }