/* roulang page: index */
:root {
            --primary: #18A058;
            --primary-hover: #138346;
            --primary-light: #E8F7EE;
            --accent: #F0A020;
            --accent-hover: #D88914;
            --bg-light: #F8FAFC;
            --surface-white: #FFFFFF;
            --dark-surface: #0F172A;
            --dark-card: #1E293B;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --radius-card: 16px;
            --radius-pill: 9999px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.1);
            --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            background-color: var(--bg-light);
            color: var(--text-body);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        /* Top Bar */
        .top-bar {
            background-color: #0B1120;
            color: #94A3B8;
            font-size: 0.825rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: 6px 0;
        }
        .top-bar a:hover {
            color: #FFFFFF;
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1030;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
        }
        .brand-logo {
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--text-heading);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.02em;
        }
        .brand-logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--primary);
            color: #FFF;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 12px rgba(24, 160, 88, 0.25);
        }

        /* Segmented Nav */
        .nav-segmented {
            background: #F1F5F9;
            padding: 5px;
            border-radius: var(--radius-pill);
            display: inline-flex;
            gap: 4px;
        }
        .nav-segmented .nav-link {
            padding: 6px 16px;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--text-muted);
            border-radius: var(--radius-pill);
            transition: var(--transition-smooth);
        }
        .nav-segmented .nav-link:hover,
        .nav-segmented .nav-link.active {
            color: var(--text-heading);
            background: #FFFFFF;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        }

        /* Button Styles */
        .btn-pill {
            border-radius: var(--radius-pill);
            font-weight: 600;
            padding: 10px 24px;
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn-primary-custom {
            background-color: var(--primary);
            color: #FFFFFF;
            border: 1px solid transparent;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-hover);
            color: #FFFFFF;
            box-shadow: 0 6px 16px rgba(24, 160, 88, 0.3);
            transform: translateY(-1px);
        }
        .btn-accent-custom {
            background-color: var(--accent);
            color: #FFFFFF;
            border: 1px solid transparent;
        }
        .btn-accent-custom:hover {
            background-color: var(--accent-hover);
            color: #FFFFFF;
            box-shadow: 0 6px 16px rgba(240, 160, 32, 0.35);
            transform: translateY(-1px);
        }
        .btn-outline-custom {
            background: transparent;
            color: var(--text-heading);
            border: 1px solid var(--border-color);
        }
        .btn-outline-custom:hover {
            background: #F1F5F9;
            color: var(--text-heading);
        }

        /* Section Global Typography */
        section {
            padding: 85px 0;
            position: relative;
        }
        .section-header {
            margin-bottom: 48px;
        }
        .section-badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .section-title {
            font-size: 2.15rem;
            font-weight: 800;
            color: var(--text-heading);
            letter-spacing: -0.02em;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto;
        }

        /* Cards & Elevations */
        .feature-card {
            background: var(--surface-white);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            box-shadow: var(--shadow-subtle);
            border: 1px solid #F1F5F9;
            transition: var(--transition-smooth);
            height: 100%;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: #E2E8F0;
        }
        .card-icon-box {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.45rem;
            margin-bottom: 22px;
        }

        /* 1. Hero Section */
        .hero-section {
            background: linear-gradient(180deg, #F0FDF4 0%, #F8FAFC 100%);
            padding: 70px 0 90px;
            position: relative;
            overflow: hidden;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 900;
            line-height: 1.22;
            color: var(--text-heading);
            letter-spacing: -0.03em;
            margin-bottom: 22px;
        }
        .hero-text {
            font-size: 1.125rem;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .code-console-block {
            background: #0B1120;
            border-radius: var(--radius-card);
            border: 1px solid #1E293B;
            box-shadow: 0 20px 40px rgba(15, 23, 42, 0.2);
            overflow: hidden;
            font-family: Consolas, Monaco, "Courier New", Courier, monospace;
        }
        .console-header {
            background: #1E293B;
            padding: 10px 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .console-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            display: inline-block;
        }
        .console-body {
            padding: 22px;
            font-size: 0.85rem;
            line-height: 1.7;
            color: #E2E8F0;
        }

        /* 2. Brand Intro */
        .intro-metric-badge {
            background: #FFFFFF;
            border: 1px solid #E2E8F0;
            border-radius: 12px;
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
        }

        /* 4. Hot Products */
        .game-card-wide {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
            transition: var(--transition-smooth);
        }
        .game-card-wide:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .game-card-thumb {
            position: relative;
            height: 200px;
            overflow: hidden;
        }
        .game-card-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .game-card-wide:hover .game-card-thumb img {
            transform: scale(1.05);
        }
        .game-tag-floating {
            position: absolute;
            top: 12px;
            right: 12px;
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(6px);
            color: #FFF;
            font-size: 0.75rem;
            padding: 4px 10px;
            border-radius: var(--radius-pill);
            font-weight: 600;
        }

        /* 5. Concept & Philosophy */
        .dark-philosophy-section {
            background-color: var(--dark-surface);
            color: #F8FAFC;
        }
        .tech-pill-tag {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.12);
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            font-size: 0.825rem;
            color: #CBD5E1;
            display: inline-block;
            margin-right: 8px;
            margin-bottom: 8px;
        }

        /* 7. Metrics Counter */
        .metric-number {
            font-family: system-ui, -apple-system, sans-serif;
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            letter-spacing: -0.03em;
        }

        /* 9. Process Step */
        .step-circle {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 800;
            font-size: 1.15rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }

        /* 11. FAQ Accordion Customization */
        .custom-accordion .accordion-item {
            border: 1px solid var(--border-color);
            border-radius: 12px !important;
            margin-bottom: 14px;
            background: #FFFFFF;
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
        }
        .custom-accordion .accordion-button {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-heading);
            background: transparent;
            padding: 20px 24px;
            box-shadow: none;
        }
        .custom-accordion .accordion-button:not(.collapsed) {
            color: var(--primary);
            background: #F8FAFC;
        }
        .custom-accordion .accordion-body {
            padding: 20px 24px 24px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 12. Guarantee Bar */
        .guarantee-box {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            border-left: 5px solid var(--primary);
            padding: 26px;
            box-shadow: var(--shadow-subtle);
        }

        /* Footer */
        .site-footer {
            background-color: #0B1120;
            color: #94A3B8;
            font-size: 0.9rem;
            padding: 68px 0 32px;
            border-top: 1px solid #1E293B;
        }
        .footer-heading {
            color: #FFFFFF;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        .footer-links-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links-list li {
            margin-bottom: 10px;
        }
        .footer-links-list a:hover {
            color: var(--primary);
        }
        .footer-bottom {
            margin-top: 48px;
            padding-top: 24px;
            border-top: 1px solid #1E293B;
            font-size: 0.825rem;
        }

        @media (max-width: 991.98px) {
            .hero-title {
                font-size: 2.3rem;
            }
            .section-title {
                font-size: 1.85rem;
            }
            .nav-segmented {
                overflow-x: auto;
                max-width: 100%;
                white-space: nowrap;
            }
        }
        @media (max-width: 575.98px) {
            section {
                padding: 60px 0;
            }
            .hero-title {
                font-size: 1.85rem;
            }
            .metric-number {
                font-size: 2.3rem;
            }
        }