/* roulang page: index */
/* ========== 设计变量与基础重置 ========== */
        :root {
            --primary: #D32F2F;
            --primary-dark: #B71C1C;
            --primary-light: #FF5252;
            --accent: #FFD700;
            --accent-dark: #FFC107;
            --bg-dark: #0A0E17;
            --bg-card: #111827;
            --bg-card-hover: #1a202c;
            --bg-section: #0f172a;
            --text-primary: #F8FAFC;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border: rgba(255,255,255,0.08);
            --border-light: rgba(255,255,255,0.12);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.3);
            --shadow-lg: 0 16px 40px rgba(0,0,0,0.4);
            --shadow-glow: 0 0 20px rgba(211,47,47,0.3);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1280px;
            --nav-height: 72px;
        }
        
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
        }
        
        body {
            font-family: var(--font-sans);
            background-color: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            outline: none;
        }
        
        input {
            font-family: inherit;
            outline: none;
        }
        
        /* ========== 容器与布局工具 ========== */
        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        
        .section {
            padding: 100px 0;
        }
        
        @media (max-width: 768px) {
            .section {
                padding: 70px 0;
            }
        }
        
        /* ========== 导航 ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
            background: rgba(10, 14, 23, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        
        .site-header.scrolled {
            background: rgba(10, 14, 23, 0.95);
            box-shadow: 0 4px 20px rgba(0,0,0,0.5);
            border-bottom-color: rgba(255,255,255,0.1);
        }
        
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #FFFFFF 0%, #FFD700 60%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .logo i {
            font-size: 1.6rem;
            background: none;
            -webkit-text-fill-color: var(--accent);
            color: var(--accent);
        }
        
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 2.5rem;
            list-style: none;
        }
        
        .nav-link {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 0.5rem 0;
            transition: color var(--transition);
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width var(--transition);
            border-radius: 2px;
        }
        
        .nav-link:hover,
        .nav-link.active {
            color: #fff;
        }
        
        .nav-link.active::after,
        .nav-link:hover::after {
            width: 100%;
        }
        
        .nav-cta {
            background: linear-gradient(135deg, var(--primary) 0%, #E53935 100%);
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.9rem;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 15px rgba(211,47,47,0.4);
            white-space: nowrap;
        }
        
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(211,47,47,0.5);
        }
        
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 6px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            z-index: 1001;
        }
        
        .hamburger span {
            width: 26px;
            height: 2px;
            background: #fff;
            border-radius: 2px;
            transition: var(--transition);
            display: block;
        }
        
        .hamburger.active span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }
        
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                background: rgba(10, 14, 23, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 2rem;
                transition: right 0.35s ease;
                box-shadow: -5px 0 30px rgba(0,0,0,0.5);
                z-index: 999;
            }
            .nav-menu.active {
                right: 0;
            }
            .hamburger {
                display: flex;
            }
            .nav-cta {
                display: block;
            }
        }
        
        /* ========== Hero ========== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            background: var(--bg-dark);
            padding-top: var(--nav-height);
        }
        
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('assets/images/backpic/back-1.webp') center/cover no-repeat;
            z-index: 0;
            opacity: 0.35;
            filter: brightness(0.6);
        }
        
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 30% 40%, rgba(211,47,47,0.15) 0%, transparent 60%),
                        linear-gradient(180deg, rgba(10,14,23,0.7) 0%, rgba(10,14,23,0.9) 100%);
            z-index: 1;
        }
        
        .hero-content {
            position: relative;
            z-index: 2;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            animation: fadeInUp 0.8s ease-out;
        }
        
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,215,0,0.1);
            border: 1px solid rgba(255,215,0,0.3);
            color: var(--accent);
            padding: 6px 18px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
            backdrop-filter: blur(4px);
        }
        
        .hero-badge .live-dot {
            width: 8px;
            height: 8px;
            background: #00E676;
            border-radius: 50%;
            display: inline-block;
            animation: pulse 1.6s infinite;
        }
        
        @keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.4); }
        }
        
        .hero h1 {
            font-size: clamp(2.8rem, 6vw, 4.5rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: 1.5rem;
            background: linear-gradient(to bottom, #FFFFFF 0%, #E0E0E0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .hero h1 span {
            background: linear-gradient(135deg, #FFD700 0%, #FFA000 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .hero p {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 2.5rem;
            line-height: 1.7;
        }
        
        .hero-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            justify-content: center;
        }
        
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            cursor: pointer;
            border: none;
            white-space: nowrap;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, #E53935 100%);
            color: #fff;
            box-shadow: 0 8px 25px rgba(211,47,47,0.5);
        }
        
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 35px rgba(211,47,47,0.6);
        }
        
        .btn-outline {
            border: 2px solid rgba(255,255,255,0.3);
            color: #fff;
            background: transparent;
            backdrop-filter: blur(8px);
        }
        
        .btn-outline:hover {
            background: rgba(255,255,255,0.08);
            border-color: var(--accent);
            color: var(--accent);
        }
        
        /* ========== 核心特点板块 ========== */
        .features {
            background: var(--bg-section);
            position: relative;
        }
        
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        
        .section-tag {
            display: inline-block;
            font-weight: 600;
            color: var(--primary-light);
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 0.8rem;
            background: rgba(211,47,47,0.15);
            padding: 4px 16px;
            border-radius: var(--radius-full);
        }
        
        .section-title {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 700;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        
        .section-desc {
            color: var(--text-muted);
            max-width: 620px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        @media (max-width: 960px) {
            .features-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 600px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }
        
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 2.5rem 2rem;
            text-align: center;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--primary), transparent);
            opacity: 0;
            transition: opacity var(--transition);
        }
        
        .feature-card:hover {
            border-color: var(--border-light);
            background: var(--bg-card-hover);
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        
        .feature-card:hover::before {
            opacity: 1;
        }
        
        .feature-icon {
            width: 64px;
            height: 64px;
            background: rgba(211,47,47,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 1.8rem;
            color: var(--primary-light);
            transition: var(--transition);
        }
        
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 0 25px rgba(211,47,47,0.5);
        }
        
        .feature-card h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 0.8rem;
        }
        
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }
        
        /* ========== 赛事资讯板块 ========== */
        .latest-matches {
            background: var(--bg-dark);
        }
        
        .match-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
            gap: 24px;
        }
        
        @media (max-width: 640px) {
            .match-grid {
                grid-template-columns: 1fr;
            }
        }
        
        .match-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        
        .match-card:hover {
            border-color: var(--border-light);
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }
        
        .match-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border);
        }
        
        .match-card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .match-status {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent);
            margin-bottom: 0.8rem;
            background: rgba(255,215,0,0.1);
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            align-self: flex-start;
        }
        
        .match-status.live {
            color: #00E676;
            background: rgba(0,230,118,0.1);
        }
        
        .match-card h3 {
            font-size: 1.2rem;
            margin-bottom: 0.6rem;
            font-weight: 600;
        }
        
        .match-teams {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }
        
        .match-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 1.2rem;
            flex: 1;
        }
        
        .match-link {
            color: var(--primary-light);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition);
        }
        
        .match-link:hover {
            gap: 8px;
            color: #fff;
        }
        
        /* ========== 数据板块 ========== */
        .stats {
            background: linear-gradient(135deg, #0F172A 0%, #1A1F2E 100%);
            position: relative;
            overflow: hidden;
        }
        
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }
        
        .stat-item {
            background: rgba(255,255,255,0.03);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 2rem 1.5rem;
            transition: var(--transition);
        }
        
        .stat-item:hover {
            background: rgba(255,255,255,0.06);
            border-color: var(--primary);
            box-shadow: var(--shadow-glow);
        }
        
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.1;
            margin-bottom: 0.4rem;
        }
        
        .stat-label {
            color: var(--text-muted);
            font-weight: 500;
            font-size: 0.95rem;
        }
        
        /* ========== FAQ ========== */
        .faq {
            background: var(--bg-section);
        }
        
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 1.5rem 2rem;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .faq-item:hover {
            border-color: var(--border-light);
            background: var(--bg-card-hover);
        }
        
        .faq-question {
            font-weight: 600;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }
        
        .faq-question i {
            font-size: 1.2rem;
            color: var(--accent);
            transition: transform var(--transition);
        }
        
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, margin-top 0.35s ease;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        
        .faq-item.active .faq-answer {
            max-height: 200px;
            margin-top: 1rem;
        }
        
        .faq-item.active .faq-question i {
            transform: rotate(45deg);
        }
        
        /* ========== CTA ========== */
        .cta-section {
            background: radial-gradient(ellipse at center, #1F1B2D 0%, var(--bg-dark) 70%);
            text-align: center;
        }
        
        .cta-box {
            background: linear-gradient(135deg, rgba(211,47,47,0.15), rgba(255,215,0,0.05));
            border: 1px solid rgba(255,215,0,0.2);
            border-radius: var(--radius-lg);
            padding: 4rem 2rem;
            max-width: 700px;
            margin: 0 auto;
            backdrop-filter: blur(4px);
        }
        
        .cta-box h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        
        .cta-box p {
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }
        
        .cta-box .btn-primary {
            font-size: 1.05rem;
            padding: 16px 40px;
        }
        
        /* ========== 页脚 ========== */
        .site-footer {
            background: #060A10;
            border-top: 1px solid var(--border);
            padding: 3rem 0 2rem;
            color: var(--text-muted);
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            margin-bottom: 2.5rem;
        }
        
        @media (max-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        
        .footer-brand .logo {
            font-size: 1.5rem;
            margin-bottom: 0.8rem;
            display: block;
        }
        
        .footer-desc {
            font-size: 0.9rem;
            line-height: 1.6;
        }
        
        .footer-links {
            display: flex;
            gap: 3rem;
            justify-content: flex-end;
        }
        
        @media (max-width: 640px) {
            .footer-links {
                justify-content: flex-start;
                flex-wrap: wrap;
                gap: 2rem;
            }
        }
        
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }
        
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        
        .footer-col a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        
        .footer-col a:hover {
            color: var(--accent);
        }
        
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        
        /* ========== 响应式微调 ========== */
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .feature-card {
                padding: 2rem 1.5rem;
            }
        }