:root {
            --primary: #0d6efd;
            --secondary: #6c757d;
            --success: #198754;
            --dark: #212529;
            --light: #f8f9fa;
            --worldcup-blue: #1e3d6f;
            --worldcup-gold: #f4c542;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--worldcup-blue) !important;
        }
        .navbar-brand span {
            color: var(--worldcup-gold);
        }
        .hero {
            background: linear-gradient(rgba(30, 61, 111, 0.85), rgba(30, 61, 111, 0.9)), url('https://images.unsplash.com/photo-1646440371304-3936dd3b19ee?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 6rem 0;
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 900;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2.5rem;
            color: var(--worldcup-blue);
            font-weight: 700;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: var(--worldcup-gold);
        }
        .section-title.text-center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-title {
            color: var(--worldcup-blue);
            font-weight: 700;
        }
        .match-card {
            background: linear-gradient(to right, #f8f9fa, #e9ecef);
            border-left: 5px solid var(--worldcup-gold);
        }
        .live-badge {
            background-color: #dc3545;
            animation: pulse 1.5s infinite;
        }
        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.6; }
            100% { opacity: 1; }
        }
        .data-stat {
            background: var(--dark);
            color: white;
            padding: 2rem;
            border-radius: 12px;
        }
        .flink {
            display: inline-block;
            background: var(--light);
            padding: 10px 20px;
            margin: 5px;
            border-radius: 50px;
            color: var(--dark);
            text-decoration: none;
            border: 1px solid #dee2e6;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary);
            color: white;
            transform: scale(1.05);
        }
        .footer {
            background-color: var(--dark);
            color: #adb5bd;
        }
        .footer a {
            color: #adb5bd;
            text-decoration: none;
        }
        .footer a:hover {
            color: white;
        }
        .analysis-box {
            border-left: 4px solid var(--success);
            background-color: #f0f9ff;
            padding: 1.5rem;
            margin: 1rem 0;
        }
        .team-flag {
            width: 40px;
            height: 40px;
            object-fit: contain;
            margin-right: 10px;
        }
        .btn-predict {
            background: linear-gradient(to right, var(--worldcup-blue), var(--primary));
            color: white;
            font-weight: 600;
            padding: 0.75rem 2rem;
            border-radius: 50px;
            border: none;
            transition: all 0.3s;
        }
        .btn-predict:hover {
            background: linear-gradient(to right, var(--primary), var(--worldcup-blue));
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0,0,0,0.2);
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .display-4 {
                font-size: 2.2rem;
            }
        }