/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0c152e;
            --primary-light: #1a2744;
            --accent: #00b4ff;
            --accent2: #7b2ff7;
            --accent3: #00e5ff;
            --glow-shadow: 0 0 20px rgba(0,180,255,0.5);
            --glass-bg: rgba(255,255,255,0.05);
            --glass-border: 1px solid rgba(255,255,255,0.1);
            --glass-blur: blur(12px);
            --text-white: #ffffff;
            --text-primary: #e0e8ff;
            --text-secondary: #c8d0e0;
            --text-muted: #8899bb;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
            --spacing-section: 80px;
            --spacing-section-mobile: 48px;
            --max-width: 1280px;
            --nav-height: 70px;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            background: linear-gradient(135deg, #0a0e1a 0%, #1a2744 50%, #0c152e 100%);
            color: var(--text-secondary);
            line-height: 1.8;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; transition: color 0.3s ease; }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; outline: none; border: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-white); font-weight: 700; line-height: 1.3; }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            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;
            height: var(--nav-height);
            background: rgba(12, 21, 46, 0.85);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            z-index: 1000;
            transition: background 0.3s ease;
        }
        .site-header.scrolled {
            background: rgba(12, 21, 46, 0.95);
            box-shadow: 0 4px 30px rgba(0,0,0,0.4);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.5px;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent), var(--accent2));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(0,180,255,0.3);
        }
        .logo span { background: linear-gradient(135deg, var(--accent), var(--accent3)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-menu a {
            color: var(--text-muted);
            font-size: 15px;
            font-weight: 500;
            position: relative;
            padding: 4px 0;
            transition: color 0.3s ease;
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
            border-radius: 2px;
        }
        .nav-menu a:hover, .nav-menu a.active { color: var(--text-white); }
        .nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }
        .nav-menu .nav-cta {
            background: linear-gradient(135deg, var(--accent), var(--accent2));
            color: #fff !important;
            padding: 10px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 0 16px rgba(0,180,255,0.3);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .nav-menu .nav-cta::after { display: none; }
        .nav-menu .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(0,180,255,0.5); }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }
        .hamburger span {
            width: 28px;
            height: 2px;
            background: var(--text-white);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .hamburger.active span:nth-child(2) { opacity: 0; }
        .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* 移动端导航抽屉 */
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.7);
            backdrop-filter: blur(8px);
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .mobile-nav-overlay.open { display: block; opacity: 1; }
        .mobile-nav-drawer {
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            height: 100%;
            background: var(--primary);
            border-left: 1px solid rgba(255,255,255,0.08);
            z-index: 1001;
            padding: 80px 32px 32px;
            transition: right 0.4s ease;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .mobile-nav-drawer.open { right: 0; }
        .mobile-nav-drawer a {
            color: var(--text-muted);
            font-size: 18px;
            font-weight: 500;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }
        .mobile-nav-drawer a.active { color: var(--accent); }
        .mobile-nav-drawer .nav-cta {
            background: linear-gradient(135deg, var(--accent), var(--accent2));
            color: #fff !important;
            text-align: center;
            padding: 14px 0;
            border-radius: var(--radius-md);
            font-weight: 600;
            border-bottom: none;
            box-shadow: 0 0 20px rgba(0,180,255,0.3);
            margin-top: 16px;
        }

        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .hamburger { display: flex; }
            .header-inner { padding: 0 16px; }
        }

        /* ===== Hero 区域 ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding-top: var(--nav-height);
            overflow: hidden;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10,14,26,0.85) 0%, rgba(26,39,68,0.75) 50%, rgba(12,21,46,0.85) 100%);
            z-index: 1;
        }
        .hero-grid-bg {
            position: absolute;
            inset: 0;
            z-index: 1;
            background-image: 
                linear-gradient(rgba(0,180,255,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,180,255,0.03) 1px, transparent 1px);
            background-size: 60px 60px;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 860px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-block;
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: 50px;
            padding: 8px 24px;
            font-size: 13px;
            color: var(--accent);
            letter-spacing: 1px;
            margin-bottom: 28px;
            font-weight: 500;
        }
        .hero h1 {
            font-size: 52px;
            line-height: 1.2;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent), var(--accent3));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-sub {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 36px;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--accent), var(--accent2));
            color: #fff;
            padding: 16px 40px;
            border-radius: var(--radius-md);
            font-size: 17px;
            font-weight: 600;
            box-shadow: 0 0 24px rgba(0,180,255,0.4);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 40px rgba(0,180,255,0.6);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            color: var(--text-white);
            padding: 16px 40px;
            border-radius: var(--radius-md);
            font-size: 17px;
            font-weight: 500;
            transition: transform 0.3s ease, background 0.3s ease;
            cursor: pointer;
        }
        .btn-secondary:hover {
            transform: translateY(-3px);
            background: rgba(255,255,255,0.1);
            color: var(--text-white);
        }
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            margin-top: 52px;
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-white);
            background: linear-gradient(135deg, var(--accent), var(--accent3));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-stat .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .hero h1 { font-size: 34px; }
            .hero-sub { font-size: 17px; }
            .hero-actions { flex-direction: column; align-items: center; }
            .btn-primary, .btn-secondary { width: 100%; max-width: 320px; justify-content: center; }
            .hero-stats { gap: 28px; }
            .hero-stat .num { font-size: 26px; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 28px; }
            .hero-badge { font-size: 12px; padding: 6px 16px; }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .section-title p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-title .accent-line {
            width: 60px;
            height: 3px;
            background: linear-gradient(135deg, var(--accent), var(--accent2));
            margin: 16px auto 0;
            border-radius: 3px;
        }
        @media (max-width: 768px) {
            .section { padding: var(--spacing-section-mobile) 0; }
            .section-title h2 { font-size: 28px; }
            .section-title p { font-size: 15px; }
        }

        /* ===== 卖点板块 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: var(--shadow-card);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 48px rgba(0,0,0,0.4);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, rgba(0,180,255,0.15), rgba(123,47,247,0.15));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: var(--accent);
            margin-bottom: 20px;
        }
        .feature-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .feature-card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .features-grid { grid-template-columns: 1fr; }
        }

        /* ===== 展示/演示板块 ===== */
        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .showcase-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: var(--glass-border);
            background: var(--glass-bg);
        }
        .showcase-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .showcase-image:hover img { transform: scale(1.03); }
        .showcase-text h2 {
            font-size: 32px;
            margin-bottom: 16px;
        }
        .showcase-text p {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 20px;
            line-height: 1.8;
        }
        .showcase-features {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .showcase-features li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .showcase-features li i {
            color: var(--accent);
            font-size: 16px;
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .showcase-grid { grid-template-columns: 1fr; gap: 32px; }
            .showcase-text h2 { font-size: 26px; }
            .showcase-text { order: 1; }
            .showcase-image { order: 2; }
        }

        /* ===== 证据/信任板块 ===== */
        .trust-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .trust-item {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 32px 20px;
            text-align: center;
            transition: transform 0.3s ease;
        }
        .trust-item:hover { transform: translateY(-4px); }
        .trust-item .num {
            font-size: 40px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent), var(--accent3));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .trust-item .label {
            font-size: 15px;
            color: var(--text-muted);
            margin-top: 8px;
        }
        @media (max-width: 1024px) {
            .trust-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .trust-grid { grid-template-columns: 1fr; }
        }

        /* ===== 最新资讯板块 (CMS) ===== */
        .news-section {
            background: rgba(10,14,26,0.4);
            border-top: 1px solid rgba(255,255,255,0.04);
            border-bottom: 1px solid rgba(255,255,255,0.04);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .news-card {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: var(--shadow-card);
        }
        .news-card:hover { transform: translateY(-4px); box-shadow: 0 12px 48px rgba(0,0,0,0.4); }
        .news-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            background: var(--primary-light);
        }
        .news-card-body {
            padding: 24px;
        }
        .news-card-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--accent);
            background: rgba(0,180,255,0.1);
            padding: 4px 14px;
            border-radius: 50px;
            margin-bottom: 12px;
            font-weight: 500;
            border: 1px solid rgba(0,180,255,0.15);
        }
        .news-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card p {
            font-size: 14px;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
            line-height: 1.6;
        }
        .news-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-muted);
        }
        .news-card-meta .date i { margin-right: 4px; }
        .news-card-meta .read-more {
            color: var(--accent);
            font-weight: 500;
            transition: gap 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .news-card-meta .read-more:hover { gap: 8px; }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            font-size: 16px;
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
        }
        .news-empty i { font-size: 40px; color: var(--accent); margin-bottom: 16px; opacity: 0.5; }
        @media (max-width: 768px) {
            .news-grid { grid-template-columns: 1fr; }
            .news-card-img { height: 180px; }
        }

        /* ===== FAQ 板块 ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: border-color 0.3s ease;
        }
        .faq-item:hover { border-color: rgba(0,180,255,0.2); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-white);
            transition: background 0.3s ease;
            user-select: none;
        }
        .faq-question:hover { background: rgba(255,255,255,0.03); }
        .faq-question i {
            color: var(--accent);
            transition: transform 0.3s ease;
            font-size: 14px;
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 24px 24px;
        }
        @media (max-width: 768px) {
            .faq-question { padding: 16px 18px; font-size: 15px; }
            .faq-item.open .faq-answer { padding: 0 18px 18px; }
        }

        /* ===== CTA 板块 ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(0,180,255,0.06), rgba(123,47,247,0.06));
            border-top: 1px solid rgba(255,255,255,0.04);
            border-bottom: 1px solid rgba(255,255,255,0.04);
        }
        .cta-box {
            text-align: center;
            padding: 60px 24px;
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
        }
        .cta-box h2 {
            font-size: 34px;
            margin-bottom: 16px;
        }
        .cta-box p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 520px;
            margin: 0 auto 32px;
        }
        .cta-box .btn-primary {
            font-size: 18px;
            padding: 18px 48px;
        }
        @media (max-width: 768px) {
            .cta-box h2 { font-size: 26px; }
            .cta-box p { font-size: 15px; }
            .cta-box { padding: 40px 16px; }
        }

        /* ===== 浮动 CTA ===== */
        .floating-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 100;
            background: linear-gradient(135deg, var(--accent), var(--accent2));
            color: #fff;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: 0 0 28px rgba(0,180,255,0.5);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
            border: none;
        }
        .floating-cta:hover {
            transform: scale(1.1);
            box-shadow: 0 0 44px rgba(0,180,255,0.7);
            color: #fff;
        }
        .floating-cta .tooltip {
            position: absolute;
            right: 72px;
            background: rgba(12,21,46,0.9);
            backdrop-filter: var(--glass-blur);
            color: var(--text-white);
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
            border: 1px solid rgba(255,255,255,0.1);
        }
        .floating-cta:hover .tooltip { opacity: 1; }
        @media (max-width: 768px) {
            .floating-cta { width: 52px; height: 52px; font-size: 20px; bottom: 20px; right: 20px; }
            .floating-cta .tooltip { display: none; }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #060a1a;
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 20px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            padding: 6px 0;
            transition: color 0.3s ease;
        }
        .footer-col a:hover { color: var(--accent); }
        .footer-social {
            display: flex;
            gap: 14px;
            margin-top: 16px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            background: var(--glass-bg);
            border: var(--glass-border);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 18px;
            transition: all 0.3s ease;
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            transform: translateY(-3px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 24px;
            text-align: center;
            font-size: 14px;
            color: var(--text-muted);
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: var(--accent); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-brand p { max-width: 100%; }
        }

        /* ===== 通用工具 ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-32 { margin-top: 32px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-32 { margin-bottom: 32px; }
        .gap-8 { gap: 8px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* ===== 焦点可访问性 ===== */
        a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

/* roulang page: article */
/* ===== CSS Variables ===== */
        :root {
            --primary: #0c152e;
            --primary-light: #1a2744;
            --accent: #00b4ff;
            --accent-hover: #33c5ff;
            --purple: #7b2ff7;
            --cyan: #00e5ff;
            --bg-start: #0a0e1a;
            --bg-end: #1a2744;
            --text-white: #ffffff;
            --text-light: #e0e8ff;
            --text-muted: #c8d0e0;
            --text-soft: #8899bb;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            --glow-shadow: 0 0 20px rgba(0, 180, 255, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
            --nav-height: 70px;
            --max-width: 1280px;
            --section-gap: 80px;
            --card-padding: 32px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-muted);
            background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        a:hover {
            color: var(--accent-hover);
        }

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

        button,
        input,
        textarea {
            font-family: var(--font-family);
        }

        ul,
        ol {
            list-style: none;
        }

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

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

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background 0.4s ease;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 20px;
            box-shadow: 0 0 16px rgba(0, 180, 255, 0.3);
        }

        .logo span {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.5px;
        }

        @media (max-width: 520px) {
            .logo span {
                font-size: 16px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 16px;
            }
        }

        /* Navigation Menu */
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-menu a {
            color: var(--text-soft);
            font-size: 15px;
            font-weight: 500;
            padding: 6px 0;
            position: relative;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--purple));
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        .nav-menu a:hover {
            color: var(--text-white);
        }

        .nav-menu a:hover::after {
            width: 100%;
        }

        .nav-menu a.active {
            color: var(--text-white);
        }

        .nav-menu a.active::after {
            width: 100%;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px !important;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            border-radius: var(--radius-md);
            color: #fff !important;
            font-weight: 600;
            font-size: 14px !important;
            box-shadow: 0 0 20px rgba(0, 180, 255, 0.3);
            transition: all 0.3s ease !important;
            white-space: nowrap;
        }

        .nav-cta i {
            font-size: 14px;
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 180, 255, 0.5);
            color: #fff !important;
        }

        .nav-cta::after {
            display: none !important;
        }

        /* Mobile Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            background: none;
            border: none;
            z-index: 1001;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2px;
            background: var(--text-white);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* Mobile Menu Overlay */
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(6px);
            z-index: 998;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .nav-overlay.open {
            opacity: 1;
        }

        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }

            .nav-menu {
                position: fixed;
                top: 0;
                right: -320px;
                width: 300px;
                height: 100vh;
                background: rgba(12, 21, 46, 0.97);
                backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                gap: 20px;
                padding: 40px 24px;
                z-index: 999;
                transition: right 0.4s cubic-bezier(0.22, 1, 0.36, 1);
                box-shadow: -8px 0 40px rgba(0, 0, 0, 0.5);
                border-left: 1px solid rgba(255, 255, 255, 0.06);
            }

            .nav-menu.open {
                right: 0;
            }

            .nav-menu a {
                font-size: 18px;
                padding: 10px 0;
            }

            .nav-cta {
                margin-top: 12px;
                padding: 14px 36px !important;
                font-size: 16px !important;
            }

            .nav-overlay.open {
                display: block;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            padding-top: calc(var(--nav-height) + 32px);
            padding-bottom: 12px;
        }

        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-soft);
        }

        .breadcrumb a {
            color: var(--text-soft);
            transition: color 0.3s ease;
        }

        .breadcrumb a:hover {
            color: var(--accent);
        }

        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.2);
            font-size: 12px;
        }

        .breadcrumb .current {
            color: var(--text-muted);
            max-width: 300px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        @media (max-width: 520px) {
            .breadcrumb {
                font-size: 13px;
            }
            .breadcrumb .current {
                max-width: 180px;
            }
        }

        /* ===== Article Page ===== */
        .article-page {
            padding: 20px 0 var(--section-gap);
        }

        .article-header {
            margin-bottom: 40px;
        }

        .article-header h1 {
            font-size: 40px;
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.3;
            margin-bottom: 20px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 20px;
            color: var(--text-soft);
            font-size: 14px;
        }

        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta .meta-item i {
            font-size: 14px;
            color: var(--accent);
        }

        .article-meta .category-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(0, 180, 255, 0.15);
            border: 1px solid rgba(0, 180, 255, 0.25);
            border-radius: 20px;
            color: var(--accent);
            font-size: 13px;
            font-weight: 500;
        }

        @media (max-width: 768px) {
            .article-header h1 {
                font-size: 28px;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
        }

        @media (max-width: 520px) {
            .article-header h1 {
                font-size: 24px;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        /* ===== Article Content ===== */
        .article-body {
            max-width: 860px;
            margin: 0 auto;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: var(--card-padding);
            box-shadow: var(--glass-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .article-body p {
            margin-bottom: 1.4em;
            color: var(--text-muted);
            line-height: 1.9;
        }

        .article-body h2 {
            font-size: 28px;
            font-weight: 600;
            color: var(--text-light);
            margin: 2em 0 0.8em;
            line-height: 1.4;
        }

        .article-body h3 {
            font-size: 22px;
            font-weight: 600;
            color: var(--text-light);
            margin: 1.6em 0 0.6em;
            line-height: 1.4;
        }

        .article-body ul,
        .article-body ol {
            margin: 1em 0 1.4em;
            padding-left: 24px;
            color: var(--text-muted);
        }

        .article-body ul li {
            list-style: disc;
            margin-bottom: 0.4em;
        }

        .article-body ol li {
            list-style: decimal;
            margin-bottom: 0.4em;
        }

        .article-body blockquote {
            margin: 1.6em 0;
            padding: 16px 24px;
            border-left: 4px solid var(--accent);
            background: rgba(0, 180, 255, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }

        .article-body code {
            font-family: 'SF Mono', 'Fira Code', monospace;
            background: rgba(255, 255, 255, 0.06);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--cyan);
        }

        .article-body pre {
            margin: 1.6em 0;
            padding: 20px 24px;
            background: rgba(0, 0, 0, 0.4);
            border-radius: var(--radius-md);
            overflow-x: auto;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .article-body pre code {
            background: none;
            padding: 0;
            color: var(--text-muted);
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.6em 0;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
        }

        .article-body a {
            color: var(--accent);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-body a:hover {
            color: var(--accent-hover);
        }

        @media (max-width: 768px) {
            .article-body {
                padding: 24px 20px;
            }
            .article-body h2 {
                font-size: 24px;
            }
            .article-body h3 {
                font-size: 20px;
            }
        }

        @media (max-width: 520px) {
            .article-body {
                padding: 20px 16px;
                border-radius: var(--radius-md);
            }
        }

        /* ===== Article Not Found ===== */
        .article-not-found {
            text-align: center;
            padding: 80px 24px;
            max-width: 600px;
            margin: 0 auto;
        }

        .article-not-found .icon-wrap {
            font-size: 64px;
            color: var(--text-soft);
            margin-bottom: 24px;
            opacity: 0.5;
        }

        .article-not-found h2 {
            font-size: 28px;
            color: var(--text-white);
            margin-bottom: 16px;
        }

        .article-not-found p {
            color: var(--text-soft);
            margin-bottom: 32px;
        }

        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            border-radius: var(--radius-md);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 0 20px rgba(0, 180, 255, 0.3);
            transition: all 0.3s ease;
        }

        .article-not-found .btn-back:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 180, 255, 0.5);
            color: #fff;
        }

        /* ===== Related Articles ===== */
        .related-section {
            max-width: 860px;
            margin: 60px auto 0;
        }

        .related-section h2 {
            font-size: 26px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .related-section h2 i {
            color: var(--accent);
            font-size: 22px;
        }

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

        .related-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: all 0.3s ease;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .related-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 180, 255, 0.2);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
        }

        .related-card .thumb {
            width: 100%;
            height: 140px;
            background: linear-gradient(135deg, rgba(0, 180, 255, 0.1), rgba(123, 47, 247, 0.1));
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
            overflow: hidden;
            background-size: cover;
            background-position: center;
        }

        .related-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .related-meta {
            font-size: 13px;
            color: var(--text-soft);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .related-card .related-meta i {
            font-size: 12px;
            color: var(--accent);
        }

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

        @media (max-width: 520px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-section h2 {
                font-size: 22px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #060a1a;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 60px 0 0;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-brand .logo {
            margin-bottom: 16px;
        }

        .footer-brand p {
            color: var(--text-soft);
            font-size: 14px;
            line-height: 1.7;
            max-width: 380px;
        }

        .footer-social {
            display: flex;
            gap: 14px;
            margin-top: 20px;
        }

        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-soft);
            font-size: 18px;
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-social a:hover {
            background: linear-gradient(135deg, var(--accent), var(--purple));
            color: #fff;
            border-color: transparent;
            transform: translateY(-2px);
            box-shadow: 0 0 20px rgba(0, 180, 255, 0.3);
        }

        .footer-col h4 {
            color: var(--text-white);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }

        .footer-col a {
            display: block;
            color: var(--text-soft);
            font-size: 14px;
            padding: 6px 0;
            transition: color 0.3s ease;
        }

        .footer-col a i {
            margin-right: 8px;
            width: 16px;
            color: var(--accent);
        }

        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            color: rgba(255, 255, 255, 0.25);
            font-size: 13px;
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.3);
            transition: color 0.3s ease;
        }

        .footer-bottom a:hover {
            color: var(--accent);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer {
                padding: 40px 0 0;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-start);
        }

        ::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.25);
        }

        /* ===== Selection ===== */
        ::selection {
            background: rgba(0, 180, 255, 0.3);
            color: #fff;
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00b4ff;
            --primary-dark: #0098d9;
            --secondary: #7b2ff7;
            --accent-cyan: #00e5ff;
            --bg-dark: #0a0e1a;
            --bg-card: rgba(255, 255, 255, 0.05);
            --bg-card-hover: rgba(255, 255, 255, 0.08);
            --glass-border: rgba(255, 255, 255, 0.1);
            --glass-border-hover: rgba(255, 255, 255, 0.2);
            --text-primary: #ffffff;
            --text-secondary: #e0e8ff;
            --text-body: #c8d0e0;
            --text-muted: #8899bb;
            --glow-shadow: 0 0 20px rgba(0, 180, 255, 0.5);
            --glow-shadow-lg: 0 0 40px rgba(0, 180, 255, 0.3);
            --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --nav-height: 70px;
            --container-width: 1280px;
            --section-gap: 80px;
            --section-gap-mobile: 48px;
        }

        /* ===== 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);
            background: var(--bg-dark);
            background-image: radial-gradient(ellipse at 20% 50%, rgba(0, 180, 255, 0.05) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 20%, rgba(123, 47, 247, 0.04) 0%, transparent 50%);
            color: var(--text-body);
            font-size: 16px;
            line-height: 1.8;
            min-height: 100vh;
        }

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

        a:hover {
            color: var(--accent-cyan);
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-width);
            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, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 180, 255, 0.3);
        }

        .logo span {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 1px;
            white-space: nowrap;
        }

        @media (max-width: 480px) {
            .logo span {
                font-size: 16px;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 15px;
            }
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-menu a {
            color: var(--text-muted);
            font-size: 15px;
            font-weight: 500;
            position: relative;
            padding: 4px 0;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav-menu a:hover {
            color: var(--text-primary);
        }

        .nav-menu a:hover::after {
            width: 100%;
        }

        .nav-menu a.active {
            color: var(--text-primary);
        }

        .nav-menu a.active::after {
            width: 100%;
            background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px !important;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-md) !important;
            color: #fff !important;
            font-weight: 600 !important;
            box-shadow: var(--glow-shadow);
            transition: var(--transition) !important;
            border: none;
        }

        .nav-cta::after {
            display: none !important;
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 180, 255, 0.6);
            color: #fff !important;
        }

        .nav-cta i {
            font-size: 14px;
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
            z-index: 1001;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }

            .nav-menu {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                background: rgba(10, 14, 26, 0.98);
                backdrop-filter: blur(30px);
                flex-direction: column;
                justify-content: center;
                gap: 20px;
                padding: 80px 40px 40px;
                transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                border-left: 1px solid rgba(255, 255, 255, 0.06);
                z-index: 1000;
            }

            .nav-menu.open {
                right: 0;
            }

            .nav-menu a {
                font-size: 18px;
                padding: 8px 0;
            }

            .nav-cta {
                justify-content: center;
                margin-top: 12px;
            }

            .nav-overlay {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(0, 0, 0, 0.6);
                z-index: 999;
                opacity: 0;
                pointer-events: none;
                transition: opacity 0.3s;
            }

            .nav-overlay.open {
                opacity: 1;
                pointer-events: auto;
            }
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            padding: 100px 0 20px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .breadcrumb a {
            color: var(--text-muted);
        }

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

        .breadcrumb span {
            color: var(--text-body);
        }

        .breadcrumb .sep {
            margin: 0 10px;
            opacity: 0.4;
        }

        /* ===== Hero 内页横幅 ===== */
        .page-hero {
            position: relative;
            padding: 120px 0 80px;
            background: linear-gradient(135deg, rgba(10, 14, 26, 0.92), rgba(26, 39, 68, 0.88)),
                url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 180, 255, 0.08), transparent 70%);
            pointer-events: none;
        }

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

        .page-hero h1 {
            font-size: 44px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
            margin-bottom: 20px;
            max-width: 800px;
        }

        .page-hero h1 .highlight {
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero p {
            font-size: 18px;
            color: var(--text-body);
            max-width: 680px;
            line-height: 1.8;
        }

        @media (max-width: 768px) {
            .page-hero {
                padding: 100px 0 48px;
            }
            .page-hero h1 {
                font-size: 32px;
            }
            .page-hero p {
                font-size: 16px;
            }
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: var(--section-gap) 0;
        }

        @media (max-width: 768px) {
            .section {
                padding: var(--section-gap-mobile) 0;
            }
        }

        .section-title {
            font-size: 32px;
            font-weight: 600;
            color: var(--text-secondary);
            text-align: center;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--text-muted);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }
            .section-subtitle {
                font-size: 15px;
                margin-bottom: 32px;
            }
        }

        /* ===== 核心功能网格 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            transition: var(--transition);
        }

        .feature-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--glass-border-hover);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
        }

        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, rgba(0, 180, 255, 0.15), rgba(123, 47, 247, 0.15));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 24px;
            color: var(--primary);
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== 图文展示 ===== */
        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        @media (max-width: 768px) {
            .showcase-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .showcase-grid.reverse {
                direction: ltr;
            }
        }

        .showcase-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--glass-border);
            background: var(--bg-card);
        }

        .showcase-image img {
            width: 100%;
            height: auto;
            min-height: 280px;
            object-fit: cover;
        }

        .showcase-content h3 {
            font-size: 28px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .showcase-content p {
            font-size: 16px;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .showcase-content ul {
            margin-top: 16px;
        }

        .showcase-content ul li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--text-body);
            padding: 6px 0;
        }

        .showcase-content ul li i {
            color: var(--primary);
            font-size: 16px;
            margin-top: 4px;
            flex-shrink: 0;
        }

        @media (max-width: 768px) {
            .showcase-content h3 {
                font-size: 22px;
            }
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }

        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            backdrop-filter: blur(12px);
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
            position: relative;
        }

        .step-card:hover {
            border-color: var(--glass-border-hover);
            transform: translateY(-4px);
        }

        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin: 0 auto 16px;
            box-shadow: 0 0 24px rgba(0, 180, 255, 0.25);
        }

        .step-card h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 10px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 适用场景 ===== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        @media (max-width: 640px) {
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
        }

        .scenario-card {
            background: var(--bg-card);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            transition: var(--transition);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .scenario-card:hover {
            border-color: var(--glass-border-hover);
            transform: translateY(-2px);
        }

        .scenario-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: rgba(0, 180, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            flex-shrink: 0;
        }

        .scenario-card h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }

        .scenario-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== CTA 区块 ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 180, 255, 0.08), rgba(123, 47, 247, 0.06));
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .cta-box {
            text-align: center;
            padding: 40px 0;
        }

        .cta-box h2 {
            font-size: 36px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .cta-box p {
            font-size: 18px;
            color: var(--text-body);
            max-width: 560px;
            margin: 0 auto 32px;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            font-size: 17px;
            font-weight: 600;
            border-radius: var(--radius-md);
            box-shadow: var(--glow-shadow);
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 40px rgba(0, 180, 255, 0.6);
            color: #fff;
        }

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

        @media (max-width: 768px) {
            .cta-box h2 {
                font-size: 26px;
            }
            .cta-box p {
                font-size: 16px;
            }
            .cta-button {
                padding: 14px 32px;
                font-size: 15px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--glass-border-hover);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-secondary);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--text-primary);
        }

        .faq-question .faq-toggle {
            font-size: 16px;
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question .faq-toggle {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

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

        .stat-item {
            padding: 24px 16px;
            background: var(--bg-card);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            backdrop-filter: blur(8px);
        }

        .stat-number {
            font-size: 36px;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
        }

        @media (max-width: 520px) {
            .stat-number {
                font-size: 28px;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #060a1a;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 60px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }

        .footer-brand .logo {
            margin-bottom: 16px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-social {
            display: flex;
            gap: 16px;
            margin-top: 20px;
        }

        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 18px;
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-social a:hover {
            background: rgba(0, 180, 255, 0.15);
            color: var(--primary);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            padding: 6px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .footer-col a i {
            width: 20px;
            margin-right: 6px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-muted);
        }

        .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== 浮动CTA ===== */
        .float-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 999;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: var(--glow-shadow);
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .float-cta:hover {
            transform: scale(1.1);
            box-shadow: 0 0 40px rgba(0, 180, 255, 0.6);
            color: #fff;
        }

        .float-cta .tooltip {
            position: absolute;
            right: 72px;
            background: rgba(10, 14, 26, 0.95);
            backdrop-filter: blur(12px);
            color: #fff;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .float-cta:hover .tooltip {
            opacity: 1;
        }

        @media (max-width: 768px) {
            .float-cta {
                width: 52px;
                height: 52px;
                font-size: 20px;
                bottom: 20px;
                right: 20px;
            }
            .float-cta .tooltip {
                display: none;
            }
        }

        /* ===== 分隔线 ===== */
        .divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
            margin: 0;
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .breadcrumb {
                padding: 90px 0 12px;
                font-size: 13px;
            }
        }

/* roulang page: category2 */
/* ===== CSS Variables ===== */
        :root {
            --primary: #0c152e;
            --primary-light: #1a2744;
            --accent: #00b4ff;
            --accent-dark: #0099dd;
            --purple: #7b2ff7;
            --cyan: #00e5ff;
            --glow-shadow: 0 0 20px rgba(0, 180, 255, 0.5);
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --glass-blur: 12px;
            --text-white: #ffffff;
            --text-light: #e0e8ff;
            --text-muted: #c8d0e0;
            --text-gray: #8899bb;
            --text-dark: #6a7a9a;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
            --shadow-glow: 0 0 30px rgba(0, 180, 255, 0.6);
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --nav-height: 70px;
            --max-width: 1280px;
            --spacing-section: 80px;
            --spacing-mobile: 48px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-muted);
            background: linear-gradient(135deg, #0a0e1a 0%, #1a2744 100%);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--accent); text-decoration: none; transition: color 0.3s; }
        a:hover { color: var(--cyan); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: 1rem; outline: none; border: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text-white); }
        h1 { font-size: 44px; line-height: 56px; }
        h2 { font-size: 32px; line-height: 40px; color: var(--text-light); }
        h3 { font-size: 24px; line-height: 32px; color: #d0d8ff; }
        h4 { font-size: 20px; line-height: 28px; color: var(--text-light); }
        p { margin-bottom: 1rem; }
        small, .text-sm { font-size: 14px; color: var(--text-gray); }

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

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(12, 21, 46, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-white);
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 800;
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 180, 255, 0.3);
        }
        .logo span { letter-spacing: 0.5px; }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav-menu a {
            color: var(--text-gray);
            font-size: 15px;
            font-weight: 500;
            position: relative;
            padding: 6px 0;
            transition: color 0.3s;
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--purple));
            border-radius: 2px;
            transition: width 0.3s ease;
        }
        .nav-menu a:hover { color: var(--text-white); }
        .nav-menu a:hover::after { width: 100%; }
        .nav-menu a.active {
            color: var(--accent);
        }
        .nav-menu a.active::after {
            width: 100%;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px !important;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            color: #fff !important;
            border-radius: 12px;
            font-weight: 600;
            font-size: 14px !important;
            box-shadow: 0 0 20px rgba(0, 180, 255, 0.4);
            transition: all 0.3s ease !important;
        }
        .nav-cta::after { display: none !important; }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 180, 255, 0.6);
            color: #fff !important;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: none;
            border: none;
            padding: 4px;
        }
        .nav-toggle span {
            width: 28px;
            height: 2.5px;
            background: var(--text-white);
            border-radius: 4px;
            transition: all 0.3s;
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 120px 24px 80px;
            background: linear-gradient(135deg, rgba(10, 14, 26, 0.85) 0%, rgba(26, 39, 68, 0.75) 100%), url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 30% 40%, rgba(0, 180, 255, 0.08) 0%, transparent 60%),
                        radial-gradient(circle at 70% 60%, rgba(123, 47, 247, 0.06) 0%, transparent 50%);
            pointer-events: none;
        }
        .page-hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .page-hero .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(0, 180, 255, 0.15);
            border: 1px solid rgba(0, 180, 255, 0.25);
            border-radius: 50px;
            font-size: 13px;
            color: var(--accent);
            letter-spacing: 0.5px;
            margin-bottom: 24px;
            backdrop-filter: blur(8px);
        }
        .page-hero h1 {
            font-size: 52px;
            line-height: 64px;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff 0%, #a0c4ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero p {
            font-size: 18px;
            color: var(--text-gray);
            max-width: 640px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .hero-cta-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            border-radius: 12px;
            box-shadow: 0 0 20px rgba(0, 180, 255, 0.4);
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 35px rgba(0, 180, 255, 0.6);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-white);
            font-weight: 500;
            font-size: 16px;
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: all 0.3s ease;
            cursor: pointer;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.3);
            color: var(--text-white);
            transform: translateY(-2px);
        }

        /* ===== Section Common ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: rgba(255, 255, 255, 0.02);
        }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }
        .section-header h2 {
            margin-bottom: 16px;
        }
        .section-header p {
            color: var(--text-gray);
            font-size: 17px;
        }
        .section-header .section-tag {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(0, 180, 255, 0.12);
            border-radius: 50px;
            font-size: 13px;
            color: var(--accent);
            margin-bottom: 12px;
            border: 1px solid rgba(0, 180, 255, 0.15);
        }

        /* ===== Card ===== */
        .card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border-radius: var(--radius-md);
            padding: 32px;
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
        }
        .card:hover {
            border-color: rgba(0, 180, 255, 0.25);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
        }

        /* ===== Security Overview ===== */
        .security-overview .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .overview-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--glass-border);
        }
        .overview-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 340px;
        }
        .overview-text h3 {
            margin-bottom: 20px;
        }
        .overview-text p {
            color: var(--text-gray);
            margin-bottom: 16px;
        }
        .overview-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 28px;
        }
        .stat-item {
            text-align: center;
            padding: 16px 8px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.05);
        }
        .stat-item .stat-number {
            font-size: 28px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 13px;
            color: var(--text-gray);
            margin-top: 4px;
        }

        /* ===== Security Measures ===== */
        .measures-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .measure-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: all 0.3s ease;
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .measure-card:hover {
            border-color: rgba(0, 180, 255, 0.25);
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
        }
        .measure-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            background: linear-gradient(135deg, rgba(0, 180, 255, 0.15), rgba(123, 47, 247, 0.15));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent);
        }
        .measure-body h4 {
            font-size: 18px;
            margin-bottom: 8px;
            color: var(--text-light);
        }
        .measure-body p {
            font-size: 14px;
            color: var(--text-gray);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* ===== Data Protection ===== */
        .protection-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .protection-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: all 0.3s ease;
        }
        .protection-card:hover {
            border-color: rgba(0, 180, 255, 0.25);
            transform: translateY(-4px);
        }
        .protection-card .p-icon {
            font-size: 40px;
            color: var(--accent);
            margin-bottom: 16px;
            display: block;
        }
        .protection-card h4 {
            margin-bottom: 12px;
            font-size: 18px;
        }
        .protection-card p {
            font-size: 14px;
            color: var(--text-gray);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .protection-card .p-tag {
            display: inline-block;
            margin-top: 12px;
            padding: 2px 14px;
            background: rgba(0, 180, 255, 0.1);
            border-radius: 50px;
            font-size: 12px;
            color: var(--accent);
            border: 1px solid rgba(0, 180, 255, 0.15);
        }

        /* ===== Trust / Certification ===== */
        .trust-logos {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 32px 48px;
            margin-top: 32px;
        }
        .trust-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-gray);
            font-size: 15px;
            font-weight: 500;
        }
        .trust-item i {
            font-size: 28px;
            color: var(--accent);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color 0.3s;
        }
        .faq-item:hover {
            border-color: rgba(0, 180, 255, 0.2);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-light);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: color 0.3s;
        }
        .faq-question:hover { color: var(--text-white); }
        .faq-question .faq-arrow {
            font-size: 14px;
            color: var(--text-gray);
            transition: transform 0.3s;
        }
        .faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--accent); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-gray);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            text-align: center;
            padding: 80px 24px;
            background: linear-gradient(135deg, rgba(0, 180, 255, 0.05), rgba(123, 47, 247, 0.05)), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .cta-section h2 {
            font-size: 36px;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-gray);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 17px;
        }
        .cta-section .btn-primary {
            font-size: 18px;
            padding: 16px 48px;
        }

        /* ===== Floating CTA ===== */
        .floating-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 900;
            padding: 14px 28px;
            background: linear-gradient(135deg, var(--accent), var(--purple));
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            border-radius: 50px;
            box-shadow: 0 0 25px rgba(0, 180, 255, 0.5);
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .floating-cta:hover {
            transform: translateY(-4px);
            box-shadow: 0 0 40px rgba(0, 180, 255, 0.7);
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #060a1a;
            border-top: 1px solid rgba(0, 180, 255, 0.1);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-brand .logo {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-gray);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-social {
            display: flex;
            gap: 16px;
            margin-top: 20px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-gray);
            font-size: 18px;
            transition: all 0.3s;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-social a:hover {
            background: rgba(0, 180, 255, 0.15);
            color: var(--accent);
            border-color: rgba(0, 180, 255, 0.2);
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: var(--text-gray);
            font-size: 14px;
            padding: 6px 0;
            transition: color 0.3s;
        }
        .footer-col a:hover { color: var(--accent); }
        .footer-col a i { margin-right: 8px; width: 18px; text-align: center; }
        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            font-size: 14px;
            color: var(--text-dark);
        }
        .footer-bottom a { color: var(--text-gray); }
        .footer-bottom a:hover { color: var(--accent); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .security-overview .overview-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .overview-image { order: -1; }
            .measures-grid {
                grid-template-columns: 1fr;
            }
            .protection-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }
            h1 { font-size: 32px; line-height: 40px; }
            h2 { font-size: 26px; line-height: 34px; }
            h3 { font-size: 20px; line-height: 28px; }
            .page-hero h1 { font-size: 34px; line-height: 44px; }
            .page-hero p { font-size: 16px; }
            .page-hero { min-height: 50vh; padding: 100px 20px 60px; }

            .nav-menu {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(12, 21, 46, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 24px 32px;
                gap: 16px;
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.4s ease;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
                pointer-events: none;
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-menu a { font-size: 17px; padding: 10px 0; }
            .nav-cta { justify-content: center; margin-top: 8px; }
            .nav-toggle { display: flex; }

            .overview-stats {
                grid-template-columns: repeat(3, 1fr);
                gap: 10px;
            }
            .stat-item .stat-number { font-size: 22px; }
            .protection-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .cta-section h2 { font-size: 28px; }
            .cta-section .btn-primary { font-size: 16px; padding: 14px 36px; }
            .floating-cta { bottom: 20px; right: 20px; padding: 12px 20px; font-size: 14px; }
            .section-header { margin-bottom: 36px; }
            .card { padding: 24px; }
            .measure-card { padding: 20px; flex-direction: column; }
            .measure-icon { width: 44px; height: 44px; font-size: 18px; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .page-hero h1 { font-size: 28px; line-height: 38px; }
            .page-hero p { font-size: 15px; }
            .hero-cta-group { flex-direction: column; align-items: center; }
            .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
            .overview-stats { grid-template-columns: 1fr; gap: 8px; }
            .stat-item { padding: 12px; }
            .trust-logos { gap: 16px 24px; }
            .trust-item { font-size: 13px; }
            .trust-item i { font-size: 22px; }
            .faq-question { font-size: 15px; padding: 16px 18px; }
            .faq-answer { font-size: 14px; }
            .footer-social a { width: 36px; height: 36px; font-size: 16px; }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--primary); }
        ::-webkit-scrollbar-thumb { background: rgba(0, 180, 255, 0.3); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: rgba(0, 180, 255, 0.5); }

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