/* roulang page: index */
:root {
            --bg-deep: #0a0e14;
            --bg-surface: #131820;
            --bg-card: #181e28;
            --bg-elevated: #1c2433;
            --accent-primary: #f0383c;
            --accent-secondary: #ff6a2e;
            --accent-glow: #ff3d42;
            --accent-amber: #f5a623;
            --accent-green: #2ecc71;
            --accent-blue: #3498db;
            --text-primary: #eef1f5;
            --text-secondary: #b0b9c6;
            --text-muted: #6b7280;
            --border-subtle: #232a36;
            --border-medium: #2d3644;
            --radius-sm: 0.5rem;
            --radius-md: 0.85rem;
            --radius-lg: 1.2rem;
            --radius-xl: 1.6rem;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
            --shadow-elevated: 0 8px 32px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-glow: 0 0 40px rgba(240, 56, 60, 0.25), 0 0 80px rgba(240, 56, 60, 0.08);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
            --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
            -webkit-text-size-adjust: 100%;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        /* Header / Navigation */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 14, 20, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            transition: background var(--transition-smooth), border-color var(--transition-smooth);
        }
        .header.scrolled {
            background: rgba(10, 14, 20, 0.96);
            border-bottom-color: var(--border-medium);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 1.5rem;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-weight: 800;
            font-size: 1.45rem;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            flex-shrink: 0;
            transition: color var(--transition-fast);
        }
        .logo-link:hover {
            color: var(--accent-primary);
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 900;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 2px 10px rgba(240, 56, 60, 0.35);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.55rem 1rem;
            border-radius: var(--radius-md);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover,
        .nav-link:focus-visible {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
        }
        .nav-link.active {
            color: #fff;
            background: rgba(240, 56, 60, 0.15);
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.4rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.9rem;
            background: var(--accent-primary);
            color: #fff;
            transition: all var(--transition-smooth);
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(240, 56, 60, 0.3);
        }
        .nav-cta-btn:hover {
            background: var(--accent-glow);
            box-shadow: 0 4px 18px rgba(240, 56, 60, 0.45);
            transform: translateY(-1px);
        }
        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 32px;
            height: 28px;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            z-index: 1001;
            padding: 4px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2.2px;
            border-radius: 3px;
            background: var(--text-primary);
            transition: all var(--transition-smooth);
            transform-origin: center;
        }
        .mobile-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .mobile-toggle.open span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .mobile-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-nav {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 14, 20, 0.97);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 999;
            flex-direction: column;
            padding: 1.5rem;
            gap: 0.5rem;
            overflow-y: auto;
            border-top: 1px solid var(--border-subtle);
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav .nav-link {
            font-size: 1.1rem;
            padding: 0.8rem 1.2rem;
            border-radius: var(--radius-lg);
        }
        .mobile-nav .nav-cta-btn {
            margin-top: 0.75rem;
            text-align: center;
            justify-content: center;
            font-size: 1rem;
            padding: 0.8rem 1.5rem;
            border-radius: var(--radius-lg);
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            padding-top: 68px;
            overflow: hidden;
            background: var(--bg-deep);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }
        .hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg,
                    rgba(10, 14, 20, 0.55) 0%,
                    rgba(10, 14, 20, 0.7) 40%,
                    rgba(10, 14, 20, 0.92) 85%,
                    rgba(10, 14, 20, 1) 100%);
            z-index: 1;
        }
        .hero-overlay-accent {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 35%, rgba(240, 56, 60, 0.22) 0%, transparent 60%),
                radial-gradient(ellipse at 65% 55%, rgba(255, 106, 46, 0.12) 0%, transparent 55%);
            z-index: 2;
        }
        .hero-content {
            position: relative;
            z-index: 3;
            max-width: 720px;
            padding: 3rem 0 4rem;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(240, 56, 60, 0.18);
            border: 1px solid rgba(240, 56, 60, 0.35);
            color: var(--accent-glow);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 0.45rem 1rem;
            border-radius: 50px;
            margin-bottom: 1.5rem;
            letter-spacing: 0.03em;
        }
        .hero-badge .pulse-dot {
            width: 9px;
            height: 9px;
            border-radius: 50%;
            background: var(--accent-glow);
            animation: pulse-dot 1.8s ease-in-out infinite;
            box-shadow: 0 0 10px var(--accent-glow);
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.35;
                transform: scale(2.2);
            }
        }
        .hero h1 {
            font-size: clamp(2.2rem, 5.5vw, 3.6rem);
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: 1.2rem;
            color: #fff;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-secondary);
            margin-bottom: 2.2rem;
            max-width: 560px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.85rem 2rem;
            border-radius: var(--radius-lg);
            font-weight: 700;
            font-size: 1rem;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff;
            transition: all var(--transition-smooth);
            box-shadow: 0 4px 18px rgba(240, 56, 60, 0.35);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            box-shadow: 0 6px 28px rgba(240, 56, 60, 0.5);
            transform: translateY(-2px);
            filter: brightness(1.08);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 1.9rem;
            border-radius: var(--radius-lg);
            font-weight: 600;
            font-size: 1rem;
            border: 1.5px solid var(--border-medium);
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.03);
            transition: all var(--transition-smooth);
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-1px);
        }
        .hero-live-scores {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
            margin-top: 2.5rem;
        }
        .mini-score-card {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-fast);
        }
        .mini-score-card:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-elevated);
            transform: translateY(-2px);
        }
        .mini-score-card .live-tag {
            font-size: 0.7rem;
            font-weight: 700;
            color: var(--accent-glow);
            background: rgba(240, 56, 60, 0.2);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            letter-spacing: 0.04em;
            animation: pulse-dot 2s ease-in-out infinite;
        }

        /* Sections */
        .section {
            padding: 5rem 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        .section-label {
            display: inline-block;
            font-weight: 700;
            font-size: 0.8rem;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent-primary);
            margin-bottom: 0.75rem;
        }
        .section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            color: #fff;
            margin-bottom: 0.8rem;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto;
        }

        /* Features */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 2rem 1.6rem;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
            opacity: 0;
            transition: opacity var(--transition-smooth);
            border-radius: 0 0 var(--radius-sm) var(--radius-sm);
        }
        .feature-card:hover {
            border-color: var(--border-medium);
            box-shadow: var(--shadow-elevated);
            transform: translateY(-4px);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin-bottom: 1.2rem;
            background: rgba(240, 56, 60, 0.12);
            color: var(--accent-glow);
            box-shadow: 0 2px 10px rgba(240, 56, 60, 0.2);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.6rem;
            color: #fff;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Services */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .service-card {
            display: flex;
            gap: 1.5rem;
            align-items: flex-start;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
        }
        .service-card:hover {
            border-color: var(--border-medium);
            box-shadow: var(--shadow-elevated);
            transform: translateY(-3px);
        }
        .service-card-img {
            width: 140px;
            height: 100px;
            border-radius: var(--radius-md);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--bg-elevated);
        }
        .service-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .service-card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #fff;
        }
        .service-card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .service-card-body .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem;
        }
        .tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.25rem 0.7rem;
            border-radius: 50px;
            background: rgba(240, 56, 60, 0.1);
            color: var(--accent-glow);
            border: 1px solid rgba(240, 56, 60, 0.2);
        }

        /* Stats */
        .stats-bg {
            background: var(--bg-surface);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            text-align: center;
        }
        .stat-item {
            padding: 1.5rem;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
        }
        .stat-item:hover {
            box-shadow: var(--shadow-glow);
            border-color: rgba(240, 56, 60, 0.3);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 900;
            letter-spacing: -0.04em;
            color: #fff;
            line-height: 1;
            margin-bottom: 0.4rem;
        }
        .stat-number .accent {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* Coverage */
        .coverage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .coverage-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
        }
        .coverage-card:hover {
            box-shadow: var(--shadow-elevated);
            transform: translateY(-4px);
            border-color: var(--border-medium);
        }
        .coverage-card-img {
            width: 100%;
            height: 180px;
            overflow: hidden;
            background: var(--bg-elevated);
        }
        .coverage-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }
        .coverage-card:hover .coverage-card-img img {
            transform: scale(1.05);
        }
        .coverage-card-body {
            padding: 1.3rem 1.2rem;
        }
        .coverage-card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
            color: #fff;
        }
        .coverage-card-body p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.85rem;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
        }
        .faq-item:hover {
            border-color: var(--border-medium);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.3rem 1.5rem;
            font-weight: 700;
            font-size: 1rem;
            color: #fff;
            text-align: left;
            cursor: pointer;
            transition: color var(--transition-fast);
            gap: 1rem;
        }
        .faq-question:hover {
            color: var(--accent-glow);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(240, 56, 60, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            color: var(--accent-glow);
            flex-shrink: 0;
            transition: all var(--transition-smooth);
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: rgba(240, 56, 60, 0.25);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-bounce), padding var(--transition-smooth);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 1.5rem 1.3rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* CTA */
        .cta-section {
            position: relative;
            background: var(--bg-surface);
            text-align: center;
            padding: 5rem 0;
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }
        .cta-section .section-title {
            font-size: clamp(1.8rem, 4vw, 2.4rem);
        }
        .cta-section .btn-primary {
            font-size: 1.05rem;
            padding: 0.9rem 2.4rem;
            margin-top: 1.5rem;
        }

        /* Footer */
        .footer {
            background: var(--bg-deep);
            padding: 3rem 0 2rem;
            border-top: 1px solid var(--border-subtle);
            color: var(--text-secondary);
            font-size: 0.88rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand .logo-link {
            margin-bottom: 0.8rem;
        }
        .footer-brand p {
            color: var(--text-muted);
            line-height: 1.6;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: #fff;
            margin-bottom: 1.2rem;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }
        .footer-col a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--accent-glow);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            padding-top: 1.8rem;
            border-top: 1px solid var(--border-subtle);
            color: var(--text-muted);
            font-size: 0.8rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .coverage-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .nav-list {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .coverage-grid {
                grid-template-columns: 1fr;
            }
            .hero {
                min-height: 80vh;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero-desc {
                font-size: 1rem;
            }
            .section {
                padding: 3.5rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .service-card {
                flex-direction: column;
                gap: 1rem;
            }
            .service-card-img {
                width: 100%;
                height: 140px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.8rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            .stat-number {
                font-size: 2rem;
            }
            .hero-live-scores {
                gap: 0.5rem;
            }
            .mini-score-card {
                font-size: 0.78rem;
                padding: 0.5rem 0.8rem;
            }
        }
        @media (max-width: 520px) {
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-outline {
                text-align: center;
                justify-content: center;
            }
            .hero-live-scores {
                flex-direction: column;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }