/* roulang page: index */
:root {
            --bg-base: #0B0D13;
            --bg-surface: #141822;
            --bg-card: #1B2130;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(0, 242, 254, 0.4);
            --accent-gold: #D4AF37;
            --accent-cyan: #00F2FE;
            --accent-cyan-glow: rgba(0, 242, 254, 0.25);
            --text-primary: #FFFFFF;
            --text-secondary: #A0AEC0;
            --text-tertiary: #718096;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.35);
            --container-max: 1280px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }

        html {
            font-size: 16px;
            scroll-behavior: smooth;
            background-color: var(--bg-base);
            color: var(--text-primary);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            line-height: 1.75;
            overflow-x: hidden;
            background-color: var(--bg-base);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        /* Top Notification Bar */
        .topbar {
            background-color: #06070a;
            border-bottom: 1px solid var(--border-subtle);
            font-size: 0.8125rem;
            color: var(--text-tertiary);
            padding: 8px 0;
        }
        .topbar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .topbar-status {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-secondary);
        }
        .status-dot {
            width: 8px;
            height: 8px;
            background-color: #10B981;
            border-radius: 50%;
            box-shadow: 0 0 8px #10B981;
        }

        /* Navigation */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: rgba(11, 13, 19, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            transition: background 0.3s ease;
        }
        .header-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }
        .logo-box {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text-primary);
        }
        .logo-symbol {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--accent-gold), var(--accent-cyan));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #000;
            font-weight: 900;
            font-size: 1.125rem;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-link {
            font-size: 0.9375rem;
            color: var(--text-secondary);
            font-weight: 500;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 2px;
        }

        /* Buttons & Badges */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9375rem;
            cursor: pointer;
            border: 1px solid transparent;
            transition: all 0.25s ease;
        }
        .btn:active {
            transform: scale(0.98);
        }
        .btn-primary {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
            color: #000000;
            font-weight: 700;
            box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background-color: var(--bg-card);
            color: var(--text-primary);
            border: 1px solid var(--border-subtle);
        }
        .btn-secondary:hover {
            border-color: rgba(255, 255, 255, 0.25);
            background-color: #232a3d;
            transform: translateY(-2px);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background: rgba(0, 242, 254, 0.08);
            border: 1px solid rgba(0, 242, 254, 0.2);
            border-radius: 9999px;
            color: var(--accent-cyan);
            font-size: 0.8125rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        /* Section Foundations */
        section {
            padding: 96px 0;
            position: relative;
        }
        .section-header {
            max-width: 780px;
            margin: 0 auto 64px auto;
            text-align: center;
        }
        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 18px;
            letter-spacing: -0.5px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* 1. Hero Section */
        .hero {
            padding: 100px 0 120px 0;
            background: radial-gradient(circle at 50% 10%, rgba(0, 242, 254, 0.08) 0%, transparent 60%),
                        radial-gradient(circle at 80% 40%, rgba(212, 175, 55, 0.05) 0%, transparent 50%);
            border-bottom: 1px solid var(--border-subtle);
            overflow: hidden;
        }
        .hero-banner-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.7);
            margin-top: 48px;
        }
        .hero-banner-img {
            width: 100%;
            height: 480px;
            object-fit: cover;
            filter: brightness(0.85);
        }
        .hero-banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(11, 13, 19, 0.95) 100%);
            display: flex;
            align-items: flex-end;
            padding: 40px;
        }
        .hero-stats-row {
            display: flex;
            gap: 40px;
            width: 100%;
            justify-content: space-around;
        }
        .hero-stat-item {
            text-align: center;
        }
        .hero-stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1.1;
        }
        .hero-stat-label {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        /* 2. Countdown Section */
        .countdown-strip {
            padding: 32px 0;
            background: linear-gradient(90deg, #161b26, #0e121a);
            border-bottom: 1px solid var(--border-subtle);
        }
        .countdown-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }
        .countdown-timer-group {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .time-box {
            background-color: var(--bg-card);
            border: 1px solid var(--border-subtle);
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            text-align: center;
            min-width: 68px;
        }
        .time-val {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--accent-gold);
        }
        .time-unit {
            font-size: 0.75rem;
            color: var(--text-tertiary);
        }

        /* 3. Pain Points Comparison */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card-pain {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.3s ease;
        }
        .card-pain:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
        }
        .pain-tag {
            color: #EF4444;
            font-size: 0.8125rem;
            font-weight: 700;
            margin-bottom: 12px;
            text-transform: uppercase;
        }
        .pain-vs-gain {
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px dashed var(--border-subtle);
        }
        .gain-tag {
            color: #10B981;
            font-size: 0.8125rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        /* 4. Tech Pipeline */
        .tech-showcase {
            background-color: var(--bg-surface);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }
        .split-box {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .tech-img-wrapper {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
        }
        .tech-specs-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 28px;
        }
        .tech-spec-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        .spec-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background-color: rgba(0, 242, 254, 0.1);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-weight: 700;
        }

        /* 5. Features Grid */
        .grid-6 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            transition: all 0.3s ease;
        }
        .feature-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
        }
        .feature-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin: 16px 0 10px 0;
            color: var(--text-primary);
        }

        /* 6. Solutions Cards */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .solution-card {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .solution-thumb {
            width: 100%;
            height: 220px;
            object-fit: cover;
        }
        .solution-body {
            padding: 32px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        /* 7. Workflow Timeline */
        .workflow-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .workflow-card {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            position: relative;
        }
        .workflow-step {
            font-size: 0.8125rem;
            font-weight: 800;
            color: var(--accent-cyan);
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        /* 8. Showcase Tabs */
        .tabs-nav {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-bottom: 40px;
        }
        .tab-btn {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            color: var(--text-secondary);
            padding: 10px 24px;
            border-radius: 9999px;
            cursor: pointer;
            font-size: 0.9375rem;
            font-weight: 600;
            transition: all 0.2s ease;
        }
        .tab-btn.active, .tab-btn:hover {
            color: #000;
            background-color: var(--accent-cyan);
            border-color: var(--accent-cyan);
        }
        .showcase-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .showcase-item {
            background-color: var(--bg-surface);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
        }
        .showcase-img {
            width: 100%;
            height: 260px;
            object-fit: cover;
        }
        .showcase-info {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* 9. Success Cases Study */
        .case-report-box {
            background: linear-gradient(135deg, #131722, #182030);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 48px;
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 48px;
            align-items: center;
        }
        .case-metrics-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .case-metric-card {
            background-color: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 20px;
            text-align: center;
        }

        /* 10. Metrics Strip */
        .metrics-strip {
            background-color: #06080d;
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
            padding: 64px 0;
        }
        .metrics-grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .metric-big-num {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-primary);
            line-height: 1;
            background: linear-gradient(180deg, #FFFFFF 0%, #A0AEC0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 11. Testimonials Wall */
        .quote-card {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .quote-header {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 24px;
        }
        .avatar-initial {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: var(--bg-card);
            border: 1px solid var(--border-subtle);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--accent-cyan);
        }

        /* 12. News & Whitepaper */
        .news-card {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .news-thumb {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .news-content {
            padding: 24px;
            flex-grow: 1;
        }
        .news-date {
            font-size: 0.8125rem;
            color: var(--text-tertiary);
            margin-bottom: 8px;
        }

        /* 13. FAQ Accordion */
        .faq-box {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all 0.2s ease;
        }
        .faq-item[open] {
            border-color: rgba(0, 242, 254, 0.3);
            background-color: var(--bg-card);
        }
        .faq-summary {
            padding: 20px 24px;
            font-size: 1.0625rem;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-summary::-webkit-details-marker {
            display: none;
        }
        .faq-summary::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--text-tertiary);
            transition: transform 0.2s ease;
        }
        .faq-item[open] .faq-summary::after {
            content: '−';
            color: var(--accent-cyan);
        }
        .faq-body {
            padding: 0 24px 20px 24px;
            color: var(--text-secondary);
            font-size: 0.9375rem;
            line-height: 1.7;
        }

        /* 14. CTA Area */
        .cta-box {
            background: linear-gradient(135deg, #101624 0%, #060911 100%);
            border: 1px solid rgba(0, 242, 254, 0.3);
            border-radius: var(--radius-lg);
            padding: 64px 40px;
            text-align: center;
            box-shadow: 0 20px 60px rgba(0, 242, 254, 0.08);
            position: relative;
            overflow: hidden;
        }
        .cta-form {
            display: flex;
            max-width: 520px;
            margin: 32px auto 0 auto;
            gap: 12px;
        }
        .cta-input {
            flex-grow: 1;
            background-color: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 14px 20px;
            color: #fff;
            font-size: 0.9375rem;
            outline: none;
        }
        .cta-input:focus {
            border-color: var(--accent-cyan);
            background-color: rgba(255, 255, 255, 0.08);
        }

        /* Footer */
        .footer {
            background-color: #050608;
            border-top: 1px solid var(--border-subtle);
            padding: 64px 0 32px 0;
            font-size: 0.875rem;
            color: var(--text-tertiary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-col-title {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 18px;
            font-size: 0.9375rem;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-links a:hover {
            color: var(--text-primary);
        }
        .footer-bottom {
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        /* Mobile Adjustments */
        @media (max-width: 1024px) {
            .grid-3, .grid-6, .solutions-grid, .workflow-timeline, .metrics-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .split-box, .case-report-box {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .header-nav {
                height: 64px;
            }
            .nav-links {
                display: none;
            }
            .topbar-content {
                flex-direction: column;
                gap: 6px;
                text-align: center;
            }
            .section-title {
                font-size: 1.75rem;
            }
            .grid-3, .grid-6, .solutions-grid, .workflow-timeline, .showcase-grid, .metrics-grid-4 {
                grid-template-columns: 1fr;
            }
            .hero-banner-img {
                height: 280px;
            }
            .hero-stats-row {
                flex-direction: column;
                gap: 16px;
            }
            .countdown-inner {
                flex-direction: column;
                text-align: center;
            }
            .cta-form {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }