:root {
            --primary-color: #ff6b35;
            --secondary-color: #1e3a8a;
            --accent-color: #f59e0b;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f8fafc;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
        }
        .logo-brand {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 2.2rem;
            font-weight: 900;
            background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .nav-custom {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
            border-bottom: 3px solid var(--primary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            transition: all 0.3s ease;
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(30, 58, 138, 0.85), rgba(245, 158, 11, 0.85)), url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
            margin-bottom: 50px;
        }
        .section-title {
            color: var(--secondary-color);
            font-weight: 800;
            margin-bottom: 30px;
            position: relative;
            padding-bottom: 15px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--accent-color));
            bottom: 0;
            left: 0;
            border-radius: 2px;
        }
        .content-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            padding: 30px;
            margin-bottom: 30px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            height: 100%;
        }
        .content-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .highlight-text {
            background: linear-gradient(120deg, rgba(255,107,53,0.2) 0%, rgba(255,107,53,0) 100%);
            padding: 20px;
            border-left: 4px solid var(--primary-color);
            border-radius: 0 8px 8px 0;
            margin: 25px 0;
        }
        .game-image {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            transition: transform 0.4s ease;
            margin: 25px 0;
        }
        .game-image:hover {
            transform: scale(1.03);
        }
        .key-point {
            background: var(--bg-light);
            padding: 15px;
            border-radius: 10px;
            margin: 15px 0;
            border-left: 4px solid var(--accent-color);
        }
        footer {
            background: var(--secondary-color);
            color: white;
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 15px rgba(255,107,53,0.4);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(255,107,53,0.6);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0;
            }
            .logo-brand {
                font-size: 1.8rem;
            }
            .content-card {
                padding: 20px;
            }
        }