/* roulang page: index */
:root {
            --bg-deep: #060b19;
            --bg-card: rgba(15, 23, 42, 0.72);
            --bg-card-hover: rgba(22, 36, 68, 0.85);
            --bg-alt: #0a1329;
            --bg-navy: #0e1e4a;
            --cyan-main: #00f2fe;
            --blue-glow: #4facfe;
            --neon-green: #00e676;
            --laser-purple: #7928ca;
            --text-white: #ffffff;
            --text-muted: #94a3b8;
            --text-dim: #cbd5e1;
            --text-dark: #64748b;
            --border-glass: rgba(255, 255, 255, 0.09);
            --border-glow: rgba(0, 242, 254, 0.35);
            --shadow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 24px rgba(0, 242, 254, 0.4);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-full: 9999px;
            --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-dim);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            background: linear-gradient(180deg, #060b19 0%, #0b1736 100%);
            min-height: 100vh;
        }

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

        ul {
            list-style: none;
        }

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

        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Top Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(6, 11, 25, 0.82);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-glass);
        }

        .top-bar {
            background: rgba(14, 30, 74, 0.6);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 13px;
            color: var(--text-muted);
            padding: 6px 0;
        }

        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .top-bar-tags {
            display: flex;
            gap: 16px;
        }

        .top-bar-tags span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .top-bar-tags span::before {
            content: "";
            width: 6px;
            height: 6px;
            background: var(--neon-green);
            border-radius: 50%;
            box-shadow: 0 0 8px var(--neon-green);
        }

        .main-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.5px;
        }

        .brand-logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--cyan-main), var(--laser-purple));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 900;
            box-shadow: var(--shadow-glow);
        }

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

        .nav-links a {
            font-size: 15px;
            color: var(--text-muted);
            font-weight: 500;
            position: relative;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--cyan-main);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        /* Buttons & Badges */
        .btn-glow {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-full);
            background: linear-gradient(135deg, var(--cyan-main) 0%, var(--blue-glow) 100%);
            color: #060b19;
            font-weight: 700;
            font-size: 15px;
            box-shadow: 0 0 20px rgba(0, 242, 254, 0.45);
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 32px rgba(0, 242, 254, 0.7);
            color: #020617;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            border-radius: var(--radius-full);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-glass);
            color: var(--text-white);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
        }

        .btn-outline:hover {
            border-color: var(--cyan-main);
            color: var(--cyan-main);
            background: rgba(0, 242, 254, 0.08);
            transform: translateY(-2px);
        }

        .badge-cyan {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(0, 242, 254, 0.12);
            border: 1px solid rgba(0, 242, 254, 0.3);
            color: var(--cyan-main);
            font-size: 13px;
            font-weight: 600;
            border-radius: var(--radius-full);
            margin-bottom: 16px;
        }

        /* Section Global Typography */
        section {
            padding: 96px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 820px;
            margin: 0 auto 56px auto;
        }

        .section-header h2 {
            font-size: 36px;
            color: var(--text-white);
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 18px;
            line-height: 1.3;
        }

        .section-header p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* Glass Card */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 32px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

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

        /* Section 01: Hero */
        #hero {
            padding: 90px 0 110px 0;
            background: radial-gradient(circle at 75% 20%, rgba(0, 242, 254, 0.15) 0%, transparent 55%),
                        radial-gradient(circle at 15% 80%, rgba(121, 40, 202, 0.18) 0%, transparent 60%);
            border-bottom: 1px solid var(--border-glass);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 44px;
            line-height: 1.25;
            color: var(--text-white);
            font-weight: 800;
            margin-bottom: 22px;
        }

        .hero-content h1 span {
            background: linear-gradient(135deg, var(--cyan-main) 0%, var(--blue-glow) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-intro {
            font-size: 16px;
            color: var(--text-dim);
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .hero-actions {
            display: flex;
            gap: 18px;
            margin-bottom: 36px;
            flex-wrap: wrap;
        }

        .hero-trust-badges {
            display: flex;
            align-items: center;
            gap: 24px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 13px;
            color: var(--text-muted);
        }

        .hero-trust-badges div {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hero-stage-mockup {
            position: relative;
            border-radius: var(--radius-lg);
            padding: 12px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(0, 242, 254, 0.25);
            box-shadow: var(--shadow-glow);
        }

        .hero-stage-mockup img {
            border-radius: var(--radius-md);
            width: 100%;
            height: 480px;
            object-fit: cover;
        }

        .stage-floating-tag {
            position: absolute;
            bottom: 28px;
            left: 28px;
            background: rgba(6, 11, 25, 0.9);
            border: 1px solid var(--cyan-main);
            padding: 12px 20px;
            border-radius: var(--radius-md);
            backdrop-filter: blur(12px);
        }

        .stage-floating-tag strong {
            display: block;
            color: var(--cyan-main);
            font-size: 18px;
        }

        .stage-floating-tag span {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Section 02: Overview */
        #overview {
            background-color: var(--bg-alt);
        }

        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }

        .overview-img-wrap {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-glass);
        }

        .overview-img-wrap img {
            width: 100%;
            height: 420px;
            object-fit: cover;
        }

        .overview-specs {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 28px;
        }

        .spec-item {
            background: rgba(255, 255, 255, 0.03);
            padding: 18px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .spec-item .num {
            font-size: 24px;
            font-weight: 700;
            color: var(--cyan-main);
            display: block;
            margin-bottom: 4px;
        }

        .spec-item .label {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Section 03: Features */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-box {
            position: relative;
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(0, 242, 254, 0.1);
            color: var(--cyan-main);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 20px;
            border: 1px solid rgba(0, 242, 254, 0.25);
        }

        .feature-box h3 {
            font-size: 20px;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .feature-box p {
            font-size: 14px;
            color: var(--text-dim);
            line-height: 1.7;
        }

        /* Section 04: Scenarios (Tabs) */
        #scenarios {
            background-color: var(--bg-alt);
        }

        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .scenario-card {
            border-top: 3px solid transparent;
        }

        .scenario-card:hover {
            border-top-color: var(--cyan-main);
        }

        .scenario-card h3 {
            font-size: 19px;
            color: var(--text-white);
            margin: 16px 0 10px 0;
        }

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

        /* Section 05: Workflow Steps */
        .workflow-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .step-card {
            position: relative;
            text-align: left;
        }

        .step-index {
            font-size: 38px;
            font-weight: 900;
            background: linear-gradient(180deg, var(--cyan-main) 0%, rgba(255, 255, 255, 0.05) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1;
            margin-bottom: 12px;
        }

        .step-card h3 {
            font-size: 18px;
            color: var(--text-white);
            margin-bottom: 10px;
        }

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

        /* Section 06: Architecture */
        #architecture {
            background: radial-gradient(circle at 50% 50%, rgba(14, 30, 74, 0.7) 0%, #060b19 100%);
        }

        .arch-nodes-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .node-card {
            border: 1px dashed rgba(0, 242, 254, 0.25);
            background: rgba(10, 19, 41, 0.85);
            border-radius: var(--radius-md);
            padding: 30px;
        }

        .node-card h3 {
            font-size: 19px;
            color: var(--cyan-main);
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .node-card ul li {
            font-size: 14px;
            color: var(--text-dim);
            margin-bottom: 10px;
            position: relative;
            padding-left: 18px;
        }

        .node-card ul li::before {
            content: "•";
            position: absolute;
            left: 0;
            color: var(--cyan-main);
            font-size: 18px;
            line-height: 1;
        }

        /* Section 07: Stats Metric Banner */
        #stats {
            padding: 60px 0;
            background: linear-gradient(90deg, #07112b 0%, #0c1a40 50%, #07112b 100%);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }

        .stat-box .stat-val {
            font-size: 42px;
            font-weight: 800;
            color: var(--cyan-main);
            line-height: 1.1;
            margin-bottom: 8px;
            text-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
        }

        .stat-box .stat-title {
            font-size: 15px;
            color: var(--text-white);
            font-weight: 600;
            margin-bottom: 4px;
        }

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

        /* Section 08: Pricing / Products */
        #products {
            background-color: var(--bg-alt);
        }

        .products-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            align-items: stretch;
        }

        .pricing-card {
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .pricing-card.featured {
            border: 2px solid var(--cyan-main);
            box-shadow: 0 0 35px rgba(0, 242, 254, 0.25);
            background: rgba(14, 28, 60, 0.9);
        }

        .featured-ribbon {
            position: absolute;
            top: -14px;
            right: 28px;
            background: linear-gradient(135deg, var(--cyan-main), var(--blue-glow));
            color: #060b19;
            font-size: 12px;
            font-weight: 800;
            padding: 4px 14px;
            border-radius: var(--radius-full);
        }

        .price-head h3 {
            font-size: 22px;
            color: var(--text-white);
            margin-bottom: 8px;
        }

        .price-head .price-tag {
            font-size: 32px;
            font-weight: 800;
            color: var(--cyan-main);
            margin-bottom: 16px;
        }

        .price-head .price-tag span {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: normal;
        }

        .pricing-features {
            margin: 24px 0 32px 0;
            flex-grow: 1;
        }

        .pricing-features li {
            font-size: 14px;
            color: var(--text-dim);
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        /* Section 09: Cases */
        .cases-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 36px;
        }

        .case-card {
            display: grid;
            grid-template-columns: 140px 1fr;
            gap: 24px;
            align-items: center;
        }

        .case-thumb img {
            width: 100%;
            height: 140px;
            border-radius: var(--radius-sm);
            object-fit: cover;
        }

        .case-body h3 {
            font-size: 18px;
            color: var(--text-white);
            margin-bottom: 8px;
        }

        .case-body p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 12px;
        }

        .case-stat-pill {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--neon-green);
            background: rgba(0, 230, 118, 0.1);
            border: 1px solid rgba(0, 230, 118, 0.25);
            padding: 3px 10px;
            border-radius: var(--radius-full);
        }

        /* Section 10: Testimonials */
        #testimonials {
            background-color: var(--bg-alt);
        }

        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .testimonial-card p {
            font-size: 14px;
            color: var(--text-dim);
            line-height: 1.7;
            margin-bottom: 20px;
            font-style: italic;
        }

        .testimonial-user {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .user-avatar-slot {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan-main), var(--blue-glow));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #060b19;
            font-weight: 800;
            font-size: 16px;
        }

        .user-meta h4 {
            font-size: 15px;
            color: var(--text-white);
        }

        .user-meta span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* Section 11: News / Insight */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .news-card {
            overflow: hidden;
            padding: 0;
            display: flex;
            flex-direction: column;
        }

        .news-card img {
            width: 100%;
            height: 190px;
            object-fit: cover;
        }

        .news-card-inner {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .news-card-inner h3 {
            font-size: 17px;
            color: var(--text-white);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .news-card-inner p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 18px;
        }

        .news-jump-link {
            font-size: 14px;
            color: var(--cyan-main);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* Section 12: Contact CTA & Form */
        #contact-cta {
            background: radial-gradient(circle at 50% 100%, rgba(0, 242, 254, 0.12) 0%, transparent 60%);
            padding-bottom: 120px;
        }

        .cta-card-wrapper {
            background: linear-gradient(145deg, rgba(14, 28, 60, 0.85) 0%, rgba(6, 11, 25, 0.95) 100%);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 60px;
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
        }

        .cta-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 56px;
            align-items: center;
        }

        .cta-info h2 {
            font-size: 34px;
            color: var(--text-white);
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 18px;
        }

        .cta-info p {
            font-size: 15px;
            color: var(--text-dim);
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .cta-check-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-dim);
            margin-bottom: 12px;
        }

        .cta-check-list li span {
            color: var(--neon-green);
            font-weight: bold;
        }

        .cta-form {
            background: rgba(10, 19, 41, 0.7);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 32px;
        }

        .form-group {
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: #fff;
            font-size: 14px;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--cyan-main);
            box-shadow: 0 0 12px rgba(0, 242, 254, 0.3);
            background: rgba(255, 255, 255, 0.08);
        }

        /* Footer */
        .site-footer {
            background: #03060f;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 64px 0 32px 0;
            font-size: 14px;
            color: var(--text-muted);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 48px;
        }

        .footer-brand h4 {
            font-size: 20px;
            color: var(--text-white);
            margin-bottom: 16px;
            font-weight: 700;
        }

        .footer-brand p {
            font-size: 13.5px;
            line-height: 1.7;
            color: var(--text-muted);
        }

        .footer-col h5 {
            font-size: 15px;
            color: var(--text-white);
            margin-bottom: 18px;
            font-weight: 600;
        }

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

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

        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 13px;
            margin-bottom: 12px;
            color: var(--text-dim);
        }

        .footer-bottom {
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-dark);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .hero-grid,
            .overview-grid,
            .cta-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-stage-mockup {
                max-width: 600px;
                margin: 0 auto;
            }
            .features-grid,
            .scenarios-grid,
            .arch-nodes-grid,
            .products-grid,
            .testimonials-grid,
            .news-grid {
                grid-template-columns: 1fr 1fr;
            }
            .workflow-row,
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 60px 0;
            }
            .hero-content h1 {
                font-size: 32px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .features-grid,
            .scenarios-grid,
            .arch-nodes-grid,
            .products-grid,
            .testimonials-grid,
            .news-grid,
            .cases-grid,
            .workflow-row,
            .stats-grid,
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .cta-card-wrapper {
                padding: 30px 20px;
            }
            .top-bar {
                display: none;
            }
            .nav-links {
                display: none;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
        }