/* roulang page: index */
:root {
            --bg-base: #0D1117;
            --bg-card: #161B22;
            --bg-card-alt: #1F242C;
            --primary-grad: linear-gradient(135deg, #7928CA 0%, #FF0080 100%);
            --accent-cyan: #00DFD8;
            --accent-green: #10B981;
            --text-main: #FFFFFF;
            --text-secondary: #9CA3AF;
            --text-muted: #6B7280;
            --border-line: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(121, 40, 202, 0.5);
            --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
            --shadow-hover: 0 8px 30px rgba(121, 40, 202, 0.25);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-pill: 9999px;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: var(--font-family);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-grad);
            color: #FFFFFF;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            box-shadow: 0 4px 15px rgba(255, 0, 128, 0.3);
            border: none;
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            text-align: center;
        }
        .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 0, 128, 0.5);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--accent-cyan);
            border: 1px solid var(--accent-cyan);
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-outline:hover {
            background: rgba(0, 223, 216, 0.1);
            transform: translateY(-2px);
        }
        .badge-pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            background: rgba(0, 223, 216, 0.12);
            color: var(--accent-cyan);
            font-size: 13px;
            font-weight: 600;
            border: 1px solid rgba(0, 223, 216, 0.3);
            margin-bottom: 12px;
        }
        .section-header {
            text-align: center;
            max-width: 780px;
            margin: 0 auto 48px auto;
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(13, 17, 23, 0.85);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-line);
        }
        .top-bar {
            background: #090D12;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            font-size: 12px;
            padding: 8px 0;
            color: var(--text-muted);
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .status-dot {
            width: 8px;
            height: 8px;
            background-color: var(--accent-green);
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 8px var(--accent-green);
        }
        .main-nav {
            padding: 16px 0;
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .nav-logo {
            font-size: 20px;
            font-weight: 800;
            color: #FFFFFF;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-logo span {
            background: var(--primary-grad);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 24px;
            align-items: center;
        }
        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
        }
        .nav-links a:hover, .nav-links a.active {
            color: #FFFFFF;
        }
        /* Hero */
        .hero-section {
            position: relative;
            padding: 100px 0 140px 0;
            background: url('/assets/images/4fa6c543cd0a3244.png') center/cover no-repeat;
            clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(13, 17, 23, 0.85) 0%, rgba(13, 17, 23, 0.96) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 860px;
        }
        .hero-title {
            font-size: 48px;
            font-weight: 900;
            line-height: 1.25;
            margin-bottom: 24px;
            background: linear-gradient(180deg, #FFFFFF 0%, #D1D5DB 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-description {
            font-size: 18px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 36px;
        }
        .hero-badges {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-line);
        }
        .hero-badge-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-main);
            font-size: 14px;
            font-weight: 600;
        }
        /* KPI / Trust-Bar */
        .trust-section {
            padding: 40px 0;
            background: var(--bg-card);
            border-bottom: 1px solid var(--border-line);
        }
        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .kpi-card {
            background: var(--bg-card-alt);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 24px;
            text-align: center;
        }
        .kpi-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--accent-cyan);
            font-family: monospace;
            margin-bottom: 6px;
        }
        .kpi-label {
            color: var(--text-secondary);
            font-size: 14px;
        }
        /* Intro */
        .intro-section {
            padding: 90px 0;
            background: var(--bg-base);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-panel {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-line);
        }
        /* Features */
        .features-section {
            padding: 90px 0;
            background: #111620;
            border-top: 1px solid var(--border-line);
            border-bottom: 1px solid var(--border-line);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 30px;
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: var(--shadow-hover);
        }
        .feature-icon-box {
            width: 48px;
            height: 48px;
            border-radius: 8px;
            background: rgba(121, 40, 202, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 18px;
        }
        .feature-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        /* Showcase */
        .showcase-section {
            padding: 90px 0;
            background: var(--bg-base);
        }
        .showcase-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .showcase-card {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
        }
        .showcase-thumb {
            height: 200px;
            position: relative;
            overflow: hidden;
        }
        .showcase-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .showcase-card:hover .showcase-thumb img {
            transform: scale(1.05);
        }
        .showcase-body {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .showcase-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .showcase-desc {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 20px;
            line-height: 1.6;
        }
        .showcase-stats {
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: var(--accent-cyan);
            border-top: 1px solid var(--border-line);
            padding-top: 14px;
        }
        /* Dark-Philosophy */
        .philosophy-section {
            padding: 100px 0;
            background: #080A0F;
            border-top: 1px solid var(--border-line);
            border-bottom: 1px solid var(--border-line);
        }
        .diagram-box {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 40px;
            margin-top: 36px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }
        .step-item {
            position: relative;
        }
        .step-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-grad);
            color: #FFFFFF;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px auto;
        }
        .step-title {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-desc {
            font-size: 13px;
            color: var(--text-secondary);
        }
        /* Scenarios */
        .scenarios-section {
            padding: 90px 0;
            background: var(--bg-base);
        }
        .tabs-header {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 36px;
        }
        .tab-btn {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            color: var(--text-secondary);
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .tab-btn.active, .tab-btn:hover {
            color: #FFFFFF;
            background: var(--bg-card-alt);
            border-color: var(--accent-cyan);
        }
        .scenario-box {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 40px;
            align-items: center;
        }
        /* Social Proof & Milestones */
        .proof-section {
            padding: 90px 0;
            background: #111620;
            border-top: 1px solid var(--border-line);
            border-bottom: 1px solid var(--border-line);
        }
        .proof-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }
        .log-box {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 24px;
            font-family: monospace;
            font-size: 13px;
        }
        .log-line {
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            color: var(--text-secondary);
            display: flex;
            justify-content: space-between;
        }
        .log-line span.active {
            color: var(--accent-green);
        }
        /* Testimonials */
        .testimonials-section {
            padding: 90px 0;
            background: var(--bg-base);
        }
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 28px;
            box-shadow: var(--shadow-card);
        }
        .testi-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
        }
        .testi-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--bg-card-alt);
            border: 1px solid var(--border-line);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-weight: 700;
        }
        .testi-author {
            font-size: 15px;
            font-weight: 700;
        }
        .testi-role {
            font-size: 12px;
            color: var(--text-muted);
        }
        .testi-content {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }
        /* News Digest */
        .news-section {
            padding: 90px 0;
            background: #111620;
            border-top: 1px solid var(--border-line);
            border-bottom: 1px solid var(--border-line);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 24px;
        }
        .news-date {
            font-size: 12px;
            color: var(--accent-cyan);
            margin-bottom: 8px;
        }
        .news-title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .news-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        /* Comparison */
        .comparison-section {
            padding: 90px 0;
            background: var(--bg-base);
        }
        .comparison-table-wrapper {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            overflow: hidden;
        }
        .comp-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }
        .comp-table th, .comp-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-line);
            font-size: 14px;
        }
        .comp-table th {
            background: var(--bg-card-alt);
            color: #FFFFFF;
            font-weight: 700;
        }
        .comp-highlight {
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .comp-table tr:last-child td {
            border-bottom: none;
        }
        /* FAQ */
        .faq-section {
            padding: 90px 0;
            background: #111620;
            border-top: 1px solid var(--border-line);
        }
        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            margin-bottom: 14px;
            overflow: hidden;
        }
        .faq-question {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-toggle {
            font-size: 18px;
            color: var(--accent-cyan);
            transition: transform 0.3s ease;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background: var(--bg-card-alt);
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            padding: 0 24px;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 16px 24px 20px 24px;
        }
        .faq-item.active .faq-toggle {
            transform: rotate(45deg);
        }
        /* Bottom Fixed Bar */
        .fixed-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: rgba(9, 13, 18, 0.95);
            backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-line);
            padding: 12px 0;
            z-index: 999;
        }
        .fixed-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .fixed-bar-info {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        /* Footer */
        .site-footer {
            background: #090D12;
            padding: 80px 0 100px 0;
            border-top: 1px solid var(--border-line);
            font-size: 14px;
            color: var(--text-muted);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-col h4 {
            color: #FFFFFF;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .kpi-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .features-grid, .showcase-grid, .testimonials-grid, .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .diagram-box {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .hero-title {
                font-size: 32px;
            }
            .hero-section {
                padding: 60px 0 100px 0;
                clip-path: none;
            }
            .intro-grid, .scenario-box, .proof-grid {
                grid-template-columns: 1fr;
            }
            .kpi-grid, .features-grid, .showcase-grid, .testimonials-grid, .news-grid, .diagram-box {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .fixed-bar-info {
                display: none;
            }
            .fixed-bar-inner {
                justify-content: center;
            }
        }