/* roulang page: index */
:root {
            --primary: #6D28D9;
            --primary-light: #8B5CF6;
            --primary-dark: #4C1D95;
            --accent: #10B981;
            --accent-warm: #F59E0B;
            --bg-body: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-dark: #0F172A;
            --text-main: #0F172A;
            --text-muted: #475569;
            --text-light: #94A3B8;
            --border-color: #E2E8F0;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
            --shadow-md: 0 6px 16px -2px rgba(15,23,42,0.06), 0 2px 6px -1px rgba(15,23,42,0.04);
            --shadow-lg: 0 16px 28px -6px rgba(109,40,217,0.12), 0 8px 12px -3px rgba(15,23,42,0.04);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 18px;
        }

        /* Reset & Base */
        * { box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            margin: 0;
            padding: 0;
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }

        a { color: var(--primary); text-decoration: none; transition: all 0.25s ease; }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }

        /* Top Announcement Bar */
        .top-info-bar {
            background-color: #090D16;
            color: var(--text-light);
            font-size: 0.8125rem;
            padding: 7px 0;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .top-info-bar span.tag-pulse {
            background: rgba(16, 185, 129, 0.2);
            color: var(--accent);
            padding: 2px 8px;
            border-radius: 20px;
            font-weight: 600;
            margin-right: 8px;
        }

        /* Sticky Main Nav */
        .site-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 999;
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
        }
        .site-logo {
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .site-logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: bold;
        }
        .nav-links {
            display: flex;
            gap: 28px;
            margin: 0;
            list-style: none;
        }
        .nav-links a {
            color: var(--text-muted);
            font-size: 0.9375rem;
            font-weight: 600;
            position: relative;
            padding: 6px 0;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.875rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            border: 1px solid transparent;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            text-align: center;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF !important;
            box-shadow: 0 4px 12px rgba(109, 40, 217, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(109, 40, 217, 0.35);
            transform: translateY(-1px);
        }
        .btn-outline {
            border-color: var(--border-color);
            background-color: #FFFFFF;
            color: var(--text-main) !important;
        }
        .btn-outline:hover {
            border-color: var(--primary-light);
            color: var(--primary) !important;
            background-color: #FBFBFE;
        }
        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF !important;
        }
        .btn-accent:hover {
            background-color: #059669;
        }
        .btn-lg {
            padding: 14px 30px;
            font-size: 1rem;
            border-radius: 8px;
        }

        /* Section Layout Utilities */
        section {
            padding: 85px 0;
            position: relative;
        }
        .bg-white { background-color: #FFFFFF; }
        .bg-subtle { background-color: #F8FAFC; }
        .bg-deep { background-color: var(--bg-dark); color: #F8FAFC; }
        .section-header {
            margin-bottom: 50px;
        }
        .section-tag {
            display: inline-block;
            font-size: 0.785rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--primary);
            background: rgba(109, 40, 217, 0.08);
            padding: 4px 12px;
            border-radius: 4px;
            margin-bottom: 12px;
        }
        .bg-deep .section-tag {
            color: #A78BFA;
            background: rgba(167, 139, 250, 0.15);
        }
        .section-title {
            font-size: 2.1rem;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.5px;
            margin-bottom: 14px;
        }
        .bg-deep .section-title { color: #FFFFFF; }
        .section-desc {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .bg-deep .section-desc { color: var(--text-light); }

        /* Hero (5:7 Slanted Asymmetric) */
        .hero-section {
            padding: 90px 0 100px;
            background: linear-gradient(135deg, #F3F4F6 0%, #FFFFFF 100%);
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
        }
        .hero-title {
            font-size: 2.85rem;
            font-weight: 900;
            line-height: 1.22;
            letter-spacing: -1px;
            color: var(--text-main);
            margin-bottom: 22px;
        }
        .hero-title span {
            background: linear-gradient(120deg, var(--primary), #8B5CF6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-lead {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-ctas {
            display: flex;
            gap: 14px;
            margin-bottom: 40px;
        }
        .hero-kpis {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
        .hero-kpi-item strong {
            display: block;
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .hero-kpi-item span {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }
        .hero-visual-stage {
            position: relative;
            padding-left: 20px;
        }
        .hero-img-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            border: 4px solid #FFFFFF;
        }
        .hero-badge-overlay {
            position: absolute;
            bottom: -20px;
            left: -10px;
            background: #FFFFFF;
            padding: 16px 22px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .hero-badge-overlay .badge-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--accent);
            animation: pulse 2s infinite;
        }

        /* 2. Pain Points */
        .pain-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            height: 100%;
            transition: all 0.25s ease;
        }
        .pain-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-light);
            box-shadow: var(--shadow-md);
        }
        .pain-type {
            font-size: 0.785rem;
            font-weight: 700;
            color: #DC2626;
            margin-bottom: 8px;
        }
        .pain-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .pain-card p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.65;
        }

        /* 3. Overview System */
        .overview-wrap {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 40px;
            box-shadow: var(--shadow-sm);
        }
        .spec-list {
            list-style: none;
            margin: 24px 0 0;
            padding: 0;
        }
        .spec-list li {
            position: relative;
            padding-left: 24px;
            font-size: 0.9375rem;
            color: var(--text-muted);
            margin-bottom: 14px;
        }
        .spec-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: 800;
        }

        /* 4. Core Features Grid */
        .feature-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 26px;
            height: 100%;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .feature-icon-badge {
            width: 48px;
            height: 48px;
            background: rgba(109, 40, 217, 0.08);
            color: var(--primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: bold;
            margin-bottom: 18px;
        }
        .feature-card h3 {
            font-size: 1.18rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.65;
        }

        /* 5. Products Showcase */
        .product-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 100%;
            transition: all 0.25s ease;
        }
        .product-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .product-media {
            height: 190px;
            position: relative;
            overflow: hidden;
        }
        .product-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .product-card:hover .product-media img {
            transform: scale(1.04);
        }
        .product-badge-flag {
            position: absolute;
            top: 12px;
            right: 12px;
            background: rgba(15, 23, 42, 0.75);
            color: #FFFFFF;
            font-size: 0.75rem;
            padding: 3px 8px;
            border-radius: 4px;
            backdrop-filter: blur(4px);
        }
        .product-body {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .product-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .product-body p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin-bottom: 18px;
            line-height: 1.6;
        }
        .product-meta-list {
            margin-top: auto;
            border-top: 1px dashed var(--border-color);
            padding-top: 14px;
            display: flex;
            justify-content: space-between;
            font-size: 0.8125rem;
            color: var(--text-light);
        }

        /* 6. Process Timeline */
        .process-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .step-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            position: relative;
        }
        .step-num {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 800;
            color: var(--primary);
            background: rgba(109, 40, 217, 0.1);
            padding: 2px 10px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .step-item h4 {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.84rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        /* 7. Architecture Dark Zone */
        .arch-terminal {
            background: #020617;
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            padding: 28px;
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            font-size: 0.875rem;
            color: #38BDF8;
            box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.6);
        }
        .arch-node-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .arch-node {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 8px;
            padding: 20px;
        }
        .arch-node h4 {
            color: #FFFFFF;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .arch-node p {
            color: var(--text-light);
            font-size: 0.8125rem;
            margin: 0;
        }

        /* 8. Success Stories */
        .story-card {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 34px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            height: 100%;
        }
        .story-stats {
            display: flex;
            gap: 24px;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }
        .story-stat-point strong {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent);
            display: block;
        }
        .story-stat-point span {
            font-size: 0.785rem;
            color: var(--text-muted);
        }

        /* 9. Metrics Strip */
        .metrics-strip {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 55px 0;
            color: #FFFFFF;
        }
        .metric-cell {
            text-align: center;
        }
        .metric-val {
            font-size: 2.6rem;
            font-weight: 900;
            line-height: 1.1;
            margin-bottom: 6px;
            letter-spacing: -0.5px;
        }
        .metric-label {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.8);
            font-weight: 500;
        }

        /* 10. Testimonials */
        .testimonial-box {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .quote-stars {
            color: var(--accent-warm);
            font-size: 0.95rem;
            margin-bottom: 12px;
        }
        .quote-content {
            font-size: 0.9125rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .quote-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .author-avatar {
            width: 42px;
            height: 42px;
            background: var(--bg-body);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
            border: 1px solid var(--border-color);
        }
        .author-meta strong {
            display: block;
            font-size: 0.9rem;
            color: var(--text-main);
        }
        .author-meta span {
            font-size: 0.775rem;
            color: var(--text-light);
        }

        /* 11. Ecosystem News */
        .news-entry {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            height: 100%;
            transition: all 0.25s ease;
        }
        .news-entry:hover {
            border-color: var(--primary);
        }
        .news-entry-date {
            font-size: 0.785rem;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        .news-entry h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .news-entry p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        /* 12. FAQ Accordion Customization */
        .accordion {
            background: transparent;
            border: none;
        }
        .accordion-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
        }
        .accordion-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
            padding: 18px 24px;
            border: none;
            background: #FFFFFF;
            transition: color 0.2s ease;
        }
        .accordion-title:hover, .accordion-title:focus {
            background: #FAFAFD;
            color: var(--primary);
        }
        .accordion-content {
            border: none;
            padding: 0 24px 20px;
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
            background: #FFFFFF;
        }

        /* 13. Conversion CTA */
        .cta-box {
            background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 100%);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            color: #FFFFFF;
            text-align: center;
            box-shadow: var(--shadow-lg);
        }
        .cta-box h3 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: #FFFFFF;
        }
        .cta-box p {
            font-size: 1rem;
            color: var(--text-light);
            max-width: 620px;
            margin: 0 auto 34px;
            line-height: 1.7;
        }
        .cta-form-inline {
            max-width: 500px;
            margin: 0 auto;
            display: flex;
            gap: 10px;
        }
        .cta-form-inline input {
            flex-grow: 1;
            margin: 0;
            height: 48px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.08);
            color: #FFFFFF;
            padding: 0 16px;
            font-size: 0.9375rem;
        }
        .cta-form-inline input::placeholder {
            color: rgba(255, 255, 255, 0.4);
        }
        .cta-form-inline input:focus {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--accent);
            outline: none;
            box-shadow: none;
        }

        /* Footer */
        .site-footer {
            background-color: #070A11;
            color: #94A3B8;
            padding: 70px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.875rem;
        }
        .footer-brand h4 {
            color: #FFFFFF;
            font-size: 1.25rem;
            font-weight: 800;
            margin-bottom: 14px;
        }
        .footer-brand p {
            line-height: 1.7;
            max-width: 320px;
            color: #64748B;
        }
        .footer-group h5 {
            color: #F1F5F9;
            font-size: 0.9375rem;
            font-weight: 700;
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #64748B;
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            margin-top: 50px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8125rem;
            color: #475569;
        }

        /* Keyframes */
        @keyframes pulse {
            0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
            70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
            100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
        }

        /* Responsive Overrides */
        @media screen and (max-width: 1024px) {
            .hero-title { font-size: 2.3rem; }
            .process-flow { grid-template-columns: repeat(2, 1fr); }
            .hero-visual-stage { padding-left: 0; margin-top: 40px; }
        }
        @media screen and (max-width: 640px) {
            .hero-title { font-size: 1.85rem; }
            .section-title { font-size: 1.6rem; }
            .nav-links { display: none; }
            .hero-ctas { flex-direction: column; }
            .cta-form-inline { flex-direction: column; }
            .cta-form-inline input { width: 100%; }
            .process-flow { grid-template-columns: 1fr; }
            .arch-node-grid { grid-template-columns: 1fr; }
            .hero-kpis { grid-template-columns: 1fr; gap: 12px; }
            .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
            section { padding: 55px 0; }
        }