/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --bg-primary: #0B0F2A;
            --bg-secondary: #0F1838;
            --bg-alt: #0D1233;
            --brand-primary: #4D7CFE;
            --brand-secondary: #00D4FF;
            --brand-accent: #8B5CF6;
            --brand-gold: #FFC861;
            --text-primary: #F5F7FF;
            --text-secondary: #B8C0E0;
            --text-muted: #7280B0;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.10);
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.45);
            --font-base: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --nav-h: 72px;
            --section-pad: 96px;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: var(--font-base);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--brand-secondary);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover {
            color: var(--brand-secondary);
        }
        img {
            max-width: 100%;
            height: auto;
        }
        button,
        input,
        textarea {
            font-family: inherit;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 600;
            line-height: 1.3;
            margin: 0 0 0.5em;
        }
        p {
            margin: 0 0 1em;
        }
        .text-muted {
            color: var(--text-muted) !important;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section {
            padding: var(--section-pad) 0;
        }
        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }
        .section-head .eyebrow {
            display: inline-block;
            font-size: 14px;
            letter-spacing: 0.08em;
            color: var(--brand-secondary);
            background: rgba(0, 212, 255, 0.1);
            padding: 4px 16px;
            border-radius: 999px;
            margin-bottom: 16px;
            border: 1px solid rgba(0, 212, 255, 0.25);
        }
        .section-head h2 {
            font-size: 32px;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-head p {
            color: var(--text-secondary);
            font-size: 16px;
        }

        /* ===== 背景区块交替 ===== */
        .bg-secondary-section {
            background: var(--bg-secondary);
        }
        .bg-alt-section {
            background: var(--bg-alt);
        }

        /* ===== 按钮 ===== */
        .btn {
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: all 0.25s ease;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
            border: none;
            color: #fff;
            padding: 12px 28px;
            font-size: 15px;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.35);
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(0, 212, 255, 0.6);
        }
        .btn-primary:active {
            transform: translateY(-1px);
        }
        .btn-outline-light {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--text-primary);
            padding: 12px 28px;
            font-size: 15px;
            border-radius: var(--radius-md);
        }
        .btn-outline-light:hover {
            border-color: var(--brand-secondary);
            color: var(--brand-secondary);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }
        .btn-link-custom {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--brand-secondary);
            font-weight: 500;
            font-size: 14px;
        }
        .btn-link-custom i {
            transition: transform 0.25s ease;
        }
        .btn-link-custom:hover i {
            transform: translateX(4px);
        }

        /* ===== 顶栏霓虹线 ===== */
        .header-glow {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            z-index: 1100;
            background: linear-gradient(90deg, var(--brand-secondary), var(--brand-primary), var(--brand-accent));
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-h);
            background: rgba(10, 14, 35, 0.82);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            z-index: 1050;
        }
        .site-header .navbar {
            height: var(--nav-h);
            padding: 0 16px;
        }
        .site-header .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 20px;
            color: var(--text-primary);
            letter-spacing: 0.02em;
        }
        .site-header .navbar-brand:hover {
            color: var(--text-primary);
        }
        .brand-icon {
            width: 28px;
            height: 28px;
            border-radius: 8px;
            background: linear-gradient(135deg, var(--brand-secondary), var(--brand-accent));
            display: inline-block;
            box-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
            flex-shrink: 0;
        }
        .site-header .navbar-nav {
            gap: 8px;
        }
        .site-header .nav-link {
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 8px;
            position: relative;
            transition: color 0.25s ease, background 0.25s ease;
        }
        .site-header .nav-link:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.04);
        }
        .site-header .nav-link.active {
            color: var(--brand-secondary);
            text-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
        }
        .site-header .nav-link.active::after {
            content: "";
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 2px;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--brand-secondary), var(--brand-primary));
            box-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
        }
        .site-header .navbar-toggler {
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: transparent;
            padding: 8px 10px;
            border-radius: 8px;
        }
        .site-header .navbar-toggler:focus {
            box-shadow: none;
            border-color: var(--brand-secondary);
        }
        .site-header .navbar-toggler .bar {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            margin: 4px 0;
            border-radius: 2px;
            transition: 0.3s;
        }
        .nav-cta {
            margin-left: 16px;
        }
        .nav-cta .btn {
            padding: 10px 22px;
            font-size: 14px;
        }

        /* ===== 移动端导航 ===== */
        @media (max-width: 991.98px) {
            .site-header .navbar-collapse {
                background: #0A0E23;
                border-radius: 0 0 16px 16px;
                padding: 16px 20px 24px;
                margin-top: 12px;
                border: 1px solid rgba(255, 255, 255, 0.06);
                box-shadow: var(--shadow-card);
            }
            .site-header .navbar-nav {
                gap: 4px;
            }
            .site-header .nav-link {
                border-radius: 10px;
                padding: 12px 16px;
            }
            .site-header .nav-link.active {
                background: rgba(0, 212, 255, 0.06);
            }
            .site-header .nav-link.active::after {
                left: 16px;
                right: auto;
                width: 3px;
                height: 18px;
                bottom: 50%;
                transform: translateY(50%);
                background: var(--brand-secondary);
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 12px;
            }
            .nav-cta .btn {
                width: 100%;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: calc(var(--nav-h) + 72px) 0 80px;
            background:
                linear-gradient(rgba(11, 15, 42, 0.88), rgba(11, 15, 42, 0.96)),
                url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            overflow: hidden;
        }
        .hero::before {
            content: "";
            position: absolute;
            top: -120px;
            right: -80px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.25), transparent 70%);
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-row {
            display: flex;
            align-items: center;
            gap: 48px;
        }
        .hero-content {
            flex: 0 0 55%;
        }
        .hero-visual {
            flex: 0 0 45%;
        }
        .hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 212, 255, 0.1);
            border: 1px solid rgba(0, 212, 255, 0.25);
            color: var(--brand-secondary);
            font-size: 13px;
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 20px;
        }
        .hero h1 {
            font-size: 46px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 18px;
        }
        .hero h1 .gradient-text {
            background: linear-gradient(120deg, var(--brand-secondary), var(--brand-primary));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero .hero-sub {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 32px;
            max-width: 540px;
        }
        .hero-cta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 32px;
        }
        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            color: var(--text-muted);
            font-size: 14px;
        }
        .hero-trust span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .hero-trust i {
            color: var(--brand-secondary);
        }
        .hero-visual .glass-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 16px;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .hero-visual .glass-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 24px;
            right: 24px;
            height: 2px;
            background: linear-gradient(90deg, var(--brand-secondary), var(--brand-accent));
            border-radius: 2px;
        }
        .hero-visual .glass-card img {
            border-radius: 12px;
            width: 100%;
            display: block;
        }
        .hero-visual .glass-card .glass-caption {
            padding: 16px 8px 8px;
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .hero-visual .glass-card .glass-caption .tag {
            background: rgba(139, 92, 246, 0.2);
            color: #c4b5fd;
            padding: 2px 10px;
            border-radius: 6px;
            font-size: 12px;
        }

        /* ===== 痛点区 ===== */
        .pain-section .pain-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .pain-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.07);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .pain-item:hover {
            border-color: rgba(0, 212, 255, 0.3);
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.08);
        }
        .pain-icon {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: rgba(0, 212, 255, 0.1);
            color: var(--brand-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }
        .pain-item h4 {
            font-size: 16px;
            margin-bottom: 4px;
            color: var(--text-primary);
        }
        .pain-item p {
            font-size: 14px;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        /* ===== 方案卡片区 ===== */
        .solution-section .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
        }
        .solution-card {
            position: relative;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 36px 28px 28px;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: var(--shadow-card);
            transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
            overflow: hidden;
        }
        .solution-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 28px;
            right: 28px;
            height: 2px;
            background: linear-gradient(90deg, var(--brand-secondary), var(--brand-accent));
            border-radius: 2px;
            opacity: 0.7;
            transition: opacity 0.3s ease;
        }
        .solution-card:hover {
            transform: translateY(-6px);
            background: rgba(255, 255, 255, 0.08);
            box-shadow: var(--shadow-hover), 0 0 0 1px rgba(0, 212, 255, 0.25);
        }
        .solution-card:hover::before {
            opacity: 1;
        }
        .solution-card .card-icon {
            width: 54px;
            height: 54px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(139, 92, 246, 0.15));
            border: 1px solid rgba(255, 255, 255, 0.1);
            color: var(--brand-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
        }
        .solution-card h3 {
            font-size: 18px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .solution-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .solution-card .card-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.05);
            padding: 4px 12px;
            border-radius: 999px;
        }
        .solution-card.featured {
            border-color: rgba(0, 212, 255, 0.25);
            transform: translateY(-8px);
        }
        .solution-card.featured::before {
            opacity: 1;
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
        }
        .solution-card.featured .card-tag {
            background: rgba(0, 212, 255, 0.15);
            color: var(--brand-secondary);
        }

        /* ===== 数据区 ===== */
        .stats-section {
            background:
                linear-gradient(rgba(15, 24, 56, 0.92), rgba(15, 24, 56, 0.92)),
                url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            position: relative;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
        }
        .stat-number {
            font-size: 52px;
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 30px rgba(0, 212, 255, 0.25);
            font-variant-numeric: tabular-nums;
        }
        .stat-label {
            font-size: 15px;
            color: var(--text-secondary);
            margin-top: 8px;
        }
        .stats-bottom {
            text-align: center;
            color: var(--text-muted);
            font-size: 14px;
            margin-top: 40px;
        }

        /* ===== 资讯列表 ===== */
        .news-section .news-list {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            display: flex;
            gap: 24px;
            align-items: flex-start;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-card);
            transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }
        .news-card:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(0, 212, 255, 0.25);
            box-shadow: var(--shadow-hover);
        }
        .news-date {
            flex-shrink: 0;
            width: 72px;
            padding-top: 4px;
            text-align: center;
        }
        .news-date .day {
            font-size: 28px;
            font-weight: 700;
            color: var(--brand-secondary);
            line-height: 1.1;
            font-variant-numeric: tabular-nums;
        }
        .news-date .month {
            font-size: 13px;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .news-body {
            flex: 1;
        }
        .news-body .news-cat {
            display: inline-block;
            font-size: 12px;
            color: var(--brand-secondary);
            background: rgba(0, 212, 255, 0.08);
            border-radius: 6px;
            padding: 2px 10px;
            margin-bottom: 8px;
        }
        .news-body h3 {
            font-size: 17px;
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .news-body h3 a {
            color: var(--text-primary);
        }
        .news-body h3 a:hover {
            color: var(--brand-secondary);
        }
        .news-body .news-excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-body .news-meta-row {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .news-body .news-meta-row .btn-link-custom {
            font-size: 13px;
        }
        .news-empty {
            text-align: center;
            color: var(--text-muted);
            padding: 48px 24px;
            background: rgba(255, 255, 255, 0.02);
            border: 1px dashed rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
        }
        .news-more {
            text-align: center;
            margin-top: 40px;
        }

        /* ===== 表单区 ===== */
        .contact-section {
            background: var(--bg-secondary);
            position: relative;
        }
        .contact-wrap {
            display: grid;
            grid-template-columns: 1fr 1.1fr;
            gap: 48px;
            align-items: center;
        }
        .contact-info .section-head {
            text-align: left;
            margin-bottom: 24px;
        }
        .contact-info .section-head h2 {
            margin-bottom: 16px;
        }
        .contact-info .section-head p {
            color: var(--text-secondary);
        }
        .contact-info .contact-points {
            list-style: none;
            padding: 0;
            margin: 24px 0 0;
        }
        .contact-info .contact-points li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }
        .contact-info .contact-points i {
            color: var(--brand-secondary);
            font-size: 16px;
            width: 24px;
            text-align: center;
        }
        .contact-info .contact-img {
            margin-top: 24px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--glass-border);
        }
        .contact-form {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 36px;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: var(--shadow-card);
        }
        .contact-form .form-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
            margin-bottom: 6px;
        }
        .contact-form .form-control {
            background: #0B0F2A;
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: var(--text-primary);
            font-size: 15px;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .contact-form .form-control:focus {
            background: #0B0F2A;
            border-color: var(--brand-secondary);
            box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
            color: var(--text-primary);
        }
        .contact-form .form-control::placeholder {
            color: var(--text-muted);
        }
        .contact-form textarea.form-control {
            min-height: 100px;
            resize: vertical;
        }
        .contact-form .btn-primary {
            width: 100%;
            margin-top: 8px;
        }
        .privacy-note {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 16px;
            display: flex;
            align-items: flex-start;
            gap: 8px;
            line-height: 1.6;
        }
        .privacy-note i {
            margin-top: 4px;
            color: var(--brand-secondary);
        }
        .modal-trigger-wrap {
            margin-top: 20px;
            text-align: center;
        }
        .modal-trigger-wrap .btn-outline-light {
            width: 100%;
        }

        /* ===== FAQ ===== */
        .faq-section .faq-wrap {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            padding: 20px 0;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 16px;
            font-weight: 600;
            text-align: left;
            padding: 0;
            cursor: pointer;
        }
        .faq-question .faq-icon {
            color: var(--brand-secondary);
            font-size: 18px;
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
            padding: 0;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 12px;
            padding-right: 40px;
        }

        /* ===== CTA 条 ===== */
        .cta-band {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(139, 92, 246, 0.12));
            border: 1px solid rgba(0, 212, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }
        .cta-band h3 {
            font-size: 22px;
            margin-bottom: 8px;
        }
        .cta-band p {
            color: var(--text-secondary);
            font-size: 15px;
            margin: 0;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #080B20;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            position: relative;
            padding-top: 72px;
        }
        .site-footer::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, var(--brand-secondary), var(--brand-accent));
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.03em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 14px;
            transition: color 0.2s ease, padding-left 0.2s ease;
        }
        .footer-col ul li a:hover {
            color: var(--brand-secondary);
            padding-left: 4px;
        }
        .footer-contact ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-contact ul li {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 10px;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }
        .footer-contact ul li i {
            color: var(--brand-secondary);
            margin-top: 4px;
            width: 16px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            margin-top: 48px;
            padding: 20px 0;
            text-align: center;
            color: var(--text-muted);
            font-size: 14px;
        }

        /* ===== Modal ===== */
        .modal-content {
            background: var(--bg-secondary);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            box-shadow: var(--shadow-hover);
        }
        .modal-backdrop.show {
            background: rgba(8, 11, 32, 0.8);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
        }
        .modal-header,
        .modal-footer {
            border-color: rgba(255, 255, 255, 0.08);
        }
        .modal-title {
            font-size: 18px;
            color: var(--text-primary);
        }
        .modal-body {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
        }
        .modal .btn-close {
            filter: invert(1) grayscale(100%) brightness(200%);
        }

        /* ===== 通用 ===== */
        .gradient-text {
            background: linear-gradient(120deg, var(--brand-secondary), var(--brand-primary));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .back-to-top {
            position: fixed;
            bottom: 24px;
            right: 24px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
            border: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transform: translateY(16px);
            transition: all 0.3s ease;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .back-to-top:hover {
            box-shadow: 0 0 32px rgba(0, 212, 255, 0.5);
            transform: translateY(-3px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1199.98px) {
            .hero h1 {
                font-size: 38px;
            }
            .stat-number {
                font-size: 42px;
            }
        }
        @media (max-width: 991.98px) {
            :root {
                --section-pad: 72px;
            }
            .hero {
                padding-top: calc(var(--nav-h) + 48px);
            }
            .hero-row {
                flex-direction: column;
                gap: 40px;
            }
            .hero-content,
            .hero-visual {
                flex: 0 0 100%;
            }
            .hero h1 {
                font-size: 34px;
            }
            .solution-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .solution-card.featured {
                transform: none;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .contact-wrap {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 767.98px) {
            :root {
                --section-pad: 56px;
            }
            .hero {
                padding-bottom: 56px;
            }
            .hero h1 {
                font-size: 29px;
            }
            .hero .hero-sub {
                font-size: 15px;
            }
            .hero-cta .btn {
                width: 100%;
                text-align: center;
            }
            .pain-grid {
                grid-template-columns: 1fr !important;
            }
            .solution-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-number {
                font-size: 34px;
            }
            .news-card {
                flex-direction: column;
                gap: 12px;
                padding: 20px;
            }
            .news-date {
                display: flex;
                align-items: center;
                gap: 10px;
                width: auto;
                text-align: left;
            }
            .news-date .day {
                font-size: 22px;
            }
            .contact-form {
                padding: 24px;
            }
            .cta-band {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
            }
            .cta-band .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .section-head h2 {
                font-size: 24px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .hero-trust {
                gap: 12px;
                flex-direction: column;
            }
        }
        @media (min-width: 1400px) {
            .container {
                max-width: 1280px;
            }
        }

/* roulang page: category1 */
:root {
            --primary-bg: #0B0F2A;
            --secondary-bg: #0F1838;
            --alternate-bg: #0D1233;
            --brand-blue: #4D7CFE;
            --neon-cyan: #00D4FF;
            --neon-purple: #8B5CF6;
            --accent-gold: #FFC861;
            --text-main: #F5F7FF;
            --text-secondary: #B8C0E0;
            --text-muted: #7280B0;
            --border-glass: rgba(255, 255, 255, 0.10);
            --bg-glass: rgba(255, 255, 255, 0.05);
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-input: 8px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(0, 212, 255, 0.3);
            --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --section-padding: 96px 0;
            --header-height: 72px;
            --gradient-main: linear-gradient(135deg, #00D4FF, #4D7CFE);
            --gradient-text: linear-gradient(135deg, #00D4FF, #4D7CFE);
            --glow-primary: 0 0 24px rgba(0, 212, 255, 0.4);
            --glow-primary-hover: 0 0 40px rgba(0, 212, 255, 0.65);
        }

        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-stack);
            background-color: var(--primary-bg);
            color: var(--text-main);
            line-height: 1.8;
            font-size: 16px;
            overflow-x: hidden;
        }

        ul,
        ol {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

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

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

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

        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: var(--section-padding);
        }

        .section-title {
            font-size: 32px;
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 48px;
            line-height: 1.8;
        }

        .text-gradient {
            background: var(--gradient-text);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1080;
            background: rgba(10, 14, 35, 0.82);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-glass);
        }

        .site-header::before {
            content: "";
            display: block;
            height: 3px;
            background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
        }

        .site-header .navbar {
            min-height: var(--header-height);
            padding: 0;
        }

        .site-header .navbar-brand {
            display: flex;
            align-items: center;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 0.5px;
        }

        .site-header .navbar-brand:hover {
            color: var(--text-main);
        }

        .brand-icon {
            width: 28px;
            height: 28px;
            background: var(--gradient-main);
            border-radius: 8px;
            display: inline-block;
            margin-right: 10px;
            box-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
            flex-shrink: 0;
        }

        .navbar-nav {
            gap: 8px;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 18px !important;
            border-radius: 6px;
            position: relative;
            transition: all 0.3s ease;
        }

        .nav-link:hover {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-link.active {
            color: var(--neon-cyan);
            text-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 18px;
            right: 18px;
            bottom: 2px;
            height: 2px;
            background: var(--neon-cyan);
            box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
            border-radius: 2px;
        }

        .nav-cta .btn {
            padding: 10px 22px;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            background: var(--gradient-main);
            border: none;
            border-radius: var(--radius-btn);
            box-shadow: var(--glow-primary);
            transition: all 0.3s ease;
        }

        .nav-cta .btn:hover {
            box-shadow: var(--glow-primary-hover);
            transform: translateY(-2px);
            color: #fff;
        }

        .navbar-toggler {
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: transparent;
            padding: 8px 10px;
            line-height: 1;
        }

        .navbar-toggler .bar {
            display: block;
            width: 20px;
            height: 2px;
            background-color: var(--text-main);
            margin: 4px 0;
            border-radius: 2px;
            transition: background 0.3s;
        }

        .navbar-toggler:hover .bar {
            background: var(--neon-cyan);
        }

        /* Buttons */
        .btn-primary {
            background: var(--gradient-main);
            color: #fff;
            border: none;
            border-radius: var(--radius-btn);
            padding: 12px 28px;
            font-weight: 600;
            font-size: 15px;
            box-shadow: var(--glow-primary);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            background: var(--gradient-main);
            color: #fff;
            box-shadow: var(--glow-primary-hover);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-outline-light {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--text-main);
            border-radius: var(--radius-btn);
            padding: 12px 28px;
            font-weight: 600;
            font-size: 15px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            transition: all 0.3s ease;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--neon-cyan);
            color: var(--neon-cyan);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }

        /* Hero */
        .page-hero {
            padding: 120px 0 80px;
            position: relative;
            background-color: var(--primary-bg);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(11, 15, 42, 0.92) 0%, rgba(15, 24, 56, 0.85) 50%, rgba(11, 15, 42, 0.9) 100%);
            z-index: 1;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        .page-hero .hero-content {
            max-width: 680px;
        }

        .page-hero .hero-tag {
            display: inline-block;
            font-size: 14px;
            color: var(--neon-cyan);
            background: rgba(0, 212, 255, 0.15);
            border: 1px solid rgba(0, 212, 255, 0.3);
            padding: 6px 16px;
            border-radius: 30px;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }

        .page-hero h1 {
            font-size: 44px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 20px;
        }

        .page-hero .lead {
            font-size: 18px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            margin-top: 40px;
        }

        .hero-stat {
            border-left: 2px solid var(--neon-cyan);
            padding-left: 16px;
        }

        .hero-stat .num {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-main);
        }

        .hero-stat .desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Card Glow */
        .card-glow {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            height: 100%;
        }

        .card-glow::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
            opacity: 0.8;
        }

        .card-glow:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(0, 212, 255, 0.25);
        }

        /* Feature Cards */
        .feature-card {
            padding: 32px 28px;
            height: 100%;
        }

        .feature-card .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: rgba(77, 124, 254, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--neon-cyan);
            margin-bottom: 20px;
            border: 1px solid rgba(77, 124, 254, 0.2);
            transition: all 0.3s ease;
        }

        .feature-card:hover .card-icon {
            background: rgba(0, 212, 255, 0.2);
            border-color: var(--neon-cyan);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
        }

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

        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 20px;
            line-height: 1.7;
        }

        .feature-card .learn-more {
            color: var(--neon-cyan);
            font-size: 14px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all 0.3s ease;
        }

        .feature-card .learn-more:hover {
            gap: 12px;
            color: var(--neon-purple);
        }

        /* Flow Steps */
        .flow-section {
            background-color: var(--secondary-bg);
        }

        .flow-step {
            position: relative;
            padding: 32px 24px;
            height: 100%;
        }

        .flow-step .step-num {
            font-size: 42px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1;
            margin-bottom: 16px;
            display: block;
        }

        .flow-step h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .flow-step p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .flow-arrow {
            position: absolute;
            right: -20px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--neon-cyan);
            font-size: 18px;
            opacity: 0.6;
            z-index: 2;
        }

        /* Scenario Cards */
        .scenario-card {
            padding: 28px 24px;
            height: 100%;
        }

        .scenario-card .scenario-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(139, 92, 246, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--neon-purple);
            margin-bottom: 16px;
            border: 1px solid rgba(139, 92, 246, 0.25);
        }

        .scenario-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .scenario-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* Content Cards */
        .content-card {
            padding: 24px;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .content-card .content-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--accent-gold);
            background: rgba(255, 200, 97, 0.1);
            border: 1px solid rgba(255, 200, 97, 0.3);
            padding: 4px 12px;
            border-radius: 6px;
            align-self: flex-start;
            margin-bottom: 14px;
        }

        .content-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .content-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
            flex-grow: 1;
        }

        .content-card .card-meta {
            font-size: 12px;
            color: var(--text-muted);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 14px;
            margin-top: auto;
        }

        /* Stats */
        .stats-section {
            background-color: var(--alternate-bg);
        }

        .stat-item {
            text-align: center;
            padding: 24px;
        }

        .stat-number {
            font-size: 56px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.1;
            display: block;
            margin-bottom: 8px;
            text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* FAQ */
        .faq-item {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: 12px;
            margin-bottom: 16px;
            transition: all 0.3s ease;
        }

        .faq-item:hover {
            border-color: rgba(0, 212, 255, 0.2);
            background: rgba(255, 255, 255, 0.07);
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-main);
            transition: color 0.3s ease;
        }

        .faq-question:hover {
            color: var(--neon-cyan);
        }

        .faq-question .faq-icon {
            font-size: 20px;
            transition: transform 0.3s ease;
            color: var(--neon-cyan);
            flex-shrink: 0;
            margin-left: 16px;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            display: none;
            padding: 0 24px 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

        /* CTA */
        .cta-section {
            position: relative;
            padding: 80px 0;
            background-color: var(--secondary-bg);
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(11, 15, 42, 0.88);
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-box {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: 20px;
            padding: 48px;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }

        .cta-box h2 {
            font-size: 32px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .cta-box p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 28px;
        }

        /* Footer */
        .site-footer {
            background-color: #080B20;
            padding-top: 64px;
            position: relative;
        }

        .site-footer::before {
            content: "";
            display: block;
            height: 1px;
            background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            opacity: 0.4;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            padding-bottom: 48px;
        }

        .site-footer .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-top: 16px;
            padding-right: 24px;
        }

        .site-footer .footer-logo {
            display: flex;
            align-items: center;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
        }

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

        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }

        .site-footer .footer-col ul li a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: all 0.3s ease;
        }

        .site-footer .footer-col ul li a:hover {
            color: var(--neon-cyan);
            padding-left: 4px;
        }

        .site-footer .footer-contact ul li {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .site-footer .footer-contact ul li i {
            color: var(--neon-cyan);
            font-size: 14px;
            width: 18px;
        }

        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
        }

        .site-footer .footer-bottom span {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* Extra */
        .text-muted {
            color: var(--text-muted) !important;
        }

        .bg-alternate {
            background-color: var(--alternate-bg);
        }

        .shadow-glow {
            box-shadow: var(--glow-primary);
        }

        /* Responsive */
        @media (max-width: 1199.98px) {
            .container {
                max-width: 960px;
            }
        }

        @media (max-width: 991.98px) {
            :root {
                --section-padding: 72px 0;
            }

            .section-title {
                font-size: 28px;
            }

            .page-hero h1 {
                font-size: 36px;
            }

            .navbar-collapse {
                background-color: #0A0E23;
                padding: 20px;
                border-radius: 0 0 12px 12px;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
                border-top: 1px solid rgba(255, 255, 255, 0.08);
            }

            .navbar-nav {
                gap: 4px;
            }

            .nav-link {
                padding: 12px 16px !important;
                border-radius: 8px;
                font-size: 16px;
            }

            .nav-link.active {
                background: rgba(0, 212, 255, 0.08);
                border-left: 3px solid var(--neon-cyan);
            }

            .nav-link.active::after {
                display: none;
            }

            .nav-cta {
                margin-top: 16px;
            }

            .nav-cta .btn {
                width: 100%;
                text-align: center;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr !important;
                gap: 32px;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }

            .footer-brand p {
                padding-right: 0 !important;
                max-width: 480px;
            }
        }

        @media (max-width: 767.98px) {
            :root {
                --section-padding: 56px 0;
            }

            .container {
                padding: 0 20px;
            }

            .page-hero {
                padding: 80px 0 56px;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .page-hero .lead {
                font-size: 16px;
            }

            .section-title {
                font-size: 24px;
            }

            .section-subtitle {
                font-size: 15px;
                margin-bottom: 32px;
            }

            .hero-stats {
                gap: 16px;
                flex-direction: column;
            }

            .stat-number {
                font-size: 44px;
            }

            .cta-box {
                padding: 32px 24px;
            }

            .cta-box h2 {
                font-size: 26px;
            }

            .flow-arrow {
                display: none;
            }

            .footer-grid {
                grid-template-columns: 1fr !important;
                gap: 24px;
            }

            .footer-brand {
                grid-column: auto;
            }
        }

        @media (max-width: 480px) {
            .page-hero h1 {
                font-size: 26px;
            }

            .btn-primary,
            .btn-outline-light {
                padding: 10px 20px;
                font-size: 14px;
                width: 100%;
                text-align: center;
            }

            .navbar-brand {
                font-size: 17px;
            }
        }

        @media (min-width: 1400px) {
            .container {
                max-width: 1280px;
            }
        }

/* roulang page: article */
:root {
    --bg-primary: #0B0F2A;
    --bg-secondary: #0F1838;
    --bg-alt: #0D1233;
    --brand-blue: #4D7CFE;
    --brand-cyan: #00D4FF;
    --brand-violet: #8B5CF6;
    --accent-gold: #FFC861;
    --text-main: #F5F7FF;
    --text-body: #B8C0E0;
    --text-weak: #7280B0;
    --border-glass: rgba(255,255,255,0.10);
    --card-bg: rgba(255,255,255,0.05);
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
    --shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
    --glow-cyan: 0 0 24px rgba(0,212,255,0.4);
    --glow-cyan-hover: 0 0 40px rgba(0,212,255,0.65);
    --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    --section-space: 96px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-body);
    line-height: 1.8;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color .25s ease;
}

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

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

.container {
    max-width: 1280px;
    padding-left: 24px;
    padding-right: 24px;
}

.section {
    padding: var(--section-space) 0;
}

.btn {
    border-radius: var(--radius-md);
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    transition: all .25s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
}

.btn-glow {
    background: linear-gradient(135deg, var(--brand-cyan), var(--brand-blue));
    box-shadow: var(--glow-cyan);
    color: #fff !important;
}

.btn-glow:hover {
    box-shadow: var(--glow-cyan-hover);
    transform: translateY(-2px);
    color: #fff;
}

.btn-glow:active {
    transform: translateY(0);
}

.btn-outline {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--text-main);
}

.btn-outline:hover {
    border-color: var(--brand-cyan);
    box-shadow: 0 0 18px rgba(0,212,255,0.25);
    color: var(--brand-cyan);
}

/* header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1050;
    height: 72px;
    background: rgba(10,14,35,0.82);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.site-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-cyan), var(--brand-violet));
    z-index: 1;
}

.site-header .navbar {
    padding: 0;
    height: 72px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main) !important;
    letter-spacing: 0.5px;
}

.brand-icon {
    display: inline-block;
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--brand-cyan), var(--brand-violet));
    box-shadow: 0 0 16px rgba(0,212,255,0.4);
    flex-shrink: 0;
}

.navbar-nav .nav-link {
    color: var(--text-body);
    font-size: 16px;
    font-weight: 500;
    padding: 0 18px !important;
    position: relative;
    line-height: 72px;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-cyan), var(--brand-blue));
    transition: width .3s ease;
    border-radius: 2px;
}

.navbar-nav .nav-link:hover {
    color: #fff;
}

.navbar-nav .nav-link:hover::after {
    width: 60%;
}

.navbar-nav .nav-link.active {
    color: var(--brand-cyan);
    text-shadow: 0 0 12px rgba(0,212,255,0.4);
}

.navbar-nav .nav-link.active::after {
    width: 70%;
    box-shadow: 0 0 12px rgba(0,212,255,0.6);
}

.navbar-toggler {
    border: none;
    padding: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: transparent;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler .bar {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: all .3s ease;
}

.navbar-toggler[aria-expanded="true"] .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.navbar-toggler[aria-expanded="true"] .bar:nth-child(2) {
    opacity: 0;
}

.navbar-toggler[aria-expanded="true"] .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-cta .btn {
    padding: 10px 24px;
    font-size: 14px;
}

/* breadcrumb */
.article-breadcrumb {
    padding-top: 130px;
    padding-bottom: 40px;
    background: var(--bg-secondary);
    position: relative;
}

.article-breadcrumb .breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 16px;
}

.article-breadcrumb .breadcrumb-item {
    font-size: 14px;
    color: var(--text-weak);
}

.article-breadcrumb .breadcrumb-item a {
    color: var(--text-weak);
}

.article-breadcrumb .breadcrumb-item a:hover {
    color: var(--brand-cyan);
}

.article-breadcrumb .breadcrumb-item.active {
    color: var(--text-body);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: rgba(255,255,255,0.3);
}

/* article header */
.article-header {
    margin-bottom: 20px;
}

.article-header h1 {
    font-size: 38px;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-main);
    margin-bottom: 20px;
}

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

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

.article-meta .badge {
    background: rgba(77,124,254,0.15);
    color: var(--brand-cyan);
    font-weight: 500;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
}

/* article content */
.article-main {
    background: var(--bg-primary);
    padding: 0 0 80px;
}

.article-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
    margin-top: -20px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.article-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-cyan), var(--brand-violet));
}

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

.article-content h2 {
    font-size: 26px;
    font-weight: 600;
    color: var(--text-main);
    margin: 1.4em 0 0.6em;
    padding-left: 14px;
    border-left: 3px solid var(--brand-cyan);
}

.article-content h3 {
    font-size: 21px;
    font-weight: 600;
    color: var(--text-main);
    margin: 1.2em 0 0.5em;
}

.article-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-main);
    margin: 1em 0 0.4em;
}

.article-content p {
    margin-bottom: 1.2em;
}

.article-content a {
    color: var(--brand-cyan);
    border-bottom: 1px solid transparent;
}

.article-content a:hover {
    border-bottom-color: var(--brand-cyan);
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.2em;
    padding-left: 1.5em;
}

.article-content li {
    margin-bottom: 0.4em;
}

.article-content ul li::marker {
    color: var(--brand-cyan);
}

.article-content ol li::marker {
    color: var(--brand-violet);
}

.article-content blockquote {
    background: rgba(255,255,255,0.04);
    border-left: 3px solid var(--brand-cyan);
    padding: 16px 24px;
    border-radius: 0 12px 12px 0;
    margin: 1.5em 0;
    color: var(--text-body);
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content img {
    border-radius: 12px;
    margin: 1.5em 0;
    box-shadow: var(--shadow-card);
}

.article-content figure {
    margin: 1.5em 0;
}

.article-content figcaption {
    font-size: 13px;
    color: var(--text-weak);
    text-align: center;
    margin-top: 8px;
}

.article-content code {
    background: rgba(0,212,255,0.08);
    color: var(--brand-cyan);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 14px;
}

.article-content table {
    width: 100%;
    margin-bottom: 1.5em;
    border-collapse: collapse;
    background: rgba(255,255,255,0.02);
    border-radius: 12px;
    overflow: hidden;
}

.article-content th,
.article-content td {
    border: 1px solid var(--border-glass);
    padding: 12px 16px;
    text-align: left;
}

.article-content th {
    background: rgba(0,212,255,0.06);
    color: var(--text-main);
    font-weight: 600;
}

.article-content tr:hover {
    background: rgba(255,255,255,0.02);
}

/* article empty */
.article-empty {
    text-align: center;
    padding: 60px 20px;
}

.article-empty .icon {
    font-size: 56px;
    color: var(--brand-violet);
    margin-bottom: 20px;
}

.article-empty h3 {
    font-size: 24px;
    color: var(--text-main);
    margin-bottom: 12px;
}

.article-empty p {
    color: var(--text-weak);
    margin-bottom: 30px;
}

/* tags */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-glass);
}

.article-tags .tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 18px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-glass);
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-body);
    transition: all .3s ease;
}

.article-tags .tag:hover {
    border-color: var(--brand-cyan);
    color: var(--brand-cyan);
    box-shadow: 0 0 16px rgba(0,212,255,0.15);
}

/* article pager */
.article-pager {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--border-glass);
}

.article-pager a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-body);
    transition: all .3s ease;
}

.article-pager a:hover {
    border-color: var(--brand-cyan);
    color: var(--brand-cyan);
    box-shadow: 0 0 18px rgba(0,212,255,0.15);
}

/* related */
.related-section {
    background: var(--bg-secondary);
    padding: 80px 0;
    position: relative;
}

.related-section .section-title {
    font-size: 30px;
    font-weight: 600;
    color: var(--text-main);
    text-align: center;
    margin-bottom: 8px;
}

.related-section .section-sub {
    text-align: center;
    color: var(--text-weak);
    margin-bottom: 48px;
    font-size: 16px;
}

.related-card {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all .35s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.related-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover), 0 0 0 1px rgba(0,212,255,0.3);
}

.related-card .card-img {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.related-card .card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}

.related-card:hover .card-img img {
    transform: scale(1.05);
}

.related-card .card-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-cyan), var(--brand-violet));
}

.related-card .card-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.related-card .card-body h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 10px;
    line-height: 1.5;
    transition: color .3s ease;
}

.related-card:hover .card-body h3 {
    color: var(--brand-cyan);
}

.related-card .card-body p {
    font-size: 14px;
    color: var(--text-weak);
    margin-bottom: 18px;
    line-height: 1.7;
    flex-grow: 1;
}

.related-card .card-link {
    color: var(--brand-cyan);
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.related-card .card-link i {
    transition: transform .3s ease;
}

.related-card:hover .card-link i {
    transform: translateX(4px);
}

/* CTA */
.cta-section {
    background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
    position: relative;
    padding: 90px 0;
    text-align: center;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(11,15,42,0.92), rgba(15,24,56,0.85));
}

.cta-section .container {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-size: 34px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 17px;
    color: var(--text-body);
    max-width: 720px;
    margin: 0 auto 36px;
}

.cta-section .btn {
    padding: 14px 36px;
    font-size: 17px;
}

/* footer */
.site-footer {
    background: #080B20;
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--brand-cyan), var(--brand-violet));
}

.site-footer .footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    gap: 48px;
    padding: 72px 0 48px;
}

.site-footer .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 20px;
}

.site-footer p {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-weak);
    margin-bottom: 0;
}

.site-footer h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 20px;
}

.site-footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-footer ul li {
    margin-bottom: 12px;
    font-size: 14px;
    color: var(--text-weak);
}

.site-footer ul li a {
    color: var(--text-weak);
    transition: color .3s ease;
}

.site-footer ul li a:hover {
    color: var(--brand-cyan);
}

.site-footer .footer-contact i {
    color: var(--brand-cyan);
    margin-right: 8px;
    width: 16px;
    text-align: center;
}

.site-footer .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 22px 0;
    text-align: center;
}

.site-footer .footer-bottom span {
    font-size: 14px;
    color: var(--text-weak);
}

/* responsive */
@media (max-width: 1199px) {
    .site-footer .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr;
    }
}

@media (max-width: 991px) {
    :root {
        --section-space: 72px;
    }
    .site-header {
        height: auto;
    }
    .site-header .navbar {
        height: 72px;
    }
    .navbar-collapse {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #0A0E23;
        padding: 20px 24px 30px;
        border-bottom: 1px solid var(--border-glass);
        box-shadow: 0 20px 40px rgba(0,0,0,0.5);
        max-height: calc(100vh - 72px);
        overflow-y: auto;
    }
    .navbar-nav .nav-link {
        line-height: 48px;
        padding: 0 12px !important;
        border-left: 3px solid transparent;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
        border-left-color: var(--brand-cyan);
        padding-left: 16px !important;
        background: linear-gradient(90deg, rgba(0,212,255,0.08), transparent);
    }
    .navbar-nav .nav-link::after {
        display: none;
    }
    .nav-cta {
        margin-top: 20px;
    }
    .nav-cta .btn {
        width: 100%;
    }
    .article-wrapper {
        padding: 36px 28px;
    }
    .article-header h1 {
        font-size: 30px;
    }
}

@media (max-width: 767px) {
    :root {
        --section-space: 56px;
    }
    .article-breadcrumb {
        padding-top: 110px;
    }
    .article-header h1 {
        font-size: 26px;
    }
    .article-meta {
        gap: 12px;
    }
    .article-wrapper {
        padding: 28px 20px;
    }
    .article-content {
        font-size: 15px;
    }
    .article-content h2 {
        font-size: 22px;
    }
    .article-content h3 {
        font-size: 18px;
    }
    .site-footer .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
        padding: 56px 0 32px;
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 520px) {
    .container {
        padding-left: 16px;
        padding-right: 16px;
    }
    .site-header .navbar {
        height: 64px;
    }
    .navbar-collapse {
        top: 64px;
    }
    .navbar-brand {
        font-size: 18px;
    }
    .brand-icon {
        width: 20px;
        height: 20px;
    }
    .article-breadcrumb {
        padding-top: 100px;
        padding-bottom: 30px;
    }
    .article-header h1 {
        font-size: 22px;
    }
    .article-wrapper {
        padding: 24px 16px;
        border-radius: 12px;
    }
    .article-content {
        font-size: 15px;
        line-height: 1.75;
    }
    .article-meta {
        font-size: 13px;
    }
    .article-pager {
        flex-direction: column;
    }
    .article-pager a {
        width: 100%;
        justify-content: center;
    }
    .cta-section {
        padding: 60px 0;
    }
    .cta-section h2 {
        font-size: 26px;
    }
    .cta-section p {
        font-size: 15px;
    }
    .site-footer .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 48px 0 24px;
    }
}