:root {
            --primary-blue: #1a73e8;
            --ocean-deep: #0066cc;
            --coral-accent: #ff6b6b;
            --sea-green: #2ecc71;
            --sand-beige: #f5f5dc;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #e6f7ff 0%, #ffffff 100%);
        }
        .marine-navbar {
            background: linear-gradient(90deg, var(--ocean-deep) 0%, var(--primary-blue) 100%);
            box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
            padding: 1rem 0;
        }
        .game-logo {
            font-family: 'Arial Rounded MT Bold', 'Arial', sans-serif;
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            letter-spacing: 1px;
        }
        .nav-link {
            color: white !important;
            font-weight: 600;
            padding: 0.5rem 1rem !important;
            transition: all 0.3s ease;
            border-radius: 25px;
        }
        .nav-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 102, 204, 0.8), rgba(26, 115, 232, 0.9)), url('https://via.placeholder.com/1200x600') center/cover;
            color: white;
            padding: 4rem 0;
            text-align: center;
            margin-bottom: 3rem;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
            padding: 2.5rem;
            margin-bottom: 2rem;
            transition: transform 0.3s ease;
        }
        .content-section:hover {
            transform: translateY(-5px);
        }
        h1, h2, h3 {
            color: var(--ocean-deep);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        }
        h2 {
            font-size: 2.2rem;
            border-bottom: 3px solid var(--sea-green);
            padding-bottom: 0.5rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary-blue);
        }
        .key-feature {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-left: 5px solid var(--coral-accent);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 10px 10px 0;
        }
        .marine-image {
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
            transition: transform 0.4s ease;
            margin: 1.5rem 0;
        }
        .marine-image:hover {
            transform: scale(1.02);
        }
        .highlight-text {
            background: linear-gradient(120deg, #a8e6cf 0%, #dcedc1 100%);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .gameplay-tip {
            background: #e3f2fd;
            border: 2px dashed var(--primary-blue);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        .footer-section {
            background: linear-gradient(90deg, #2c3e50 0%, #34495e 100%);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .content-section p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        @media (max-width: 768px) {
            .game-logo {
                font-size: 1.8rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--coral-accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            transform: translateY(-3px);
            background: #ff5252;
        }