:root {
            --primary-blue: #1a5276;
            --ocean-teal: #16a085;
            --coral-orange: #e74c3c;
            --sand-beige: #f7dc6f;
            --deep-navy: #2c3e50;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #e6f7ff 0%, #f0f8ff 100%);
        }
        .logo-text {
            font-family: 'Georgia', serif;
            font-weight: bold;
            font-size: 2.2rem;
            color: var(--primary-blue);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .nav-custom {
            background: linear-gradient(to right, var(--primary-blue), var(--ocean-teal));
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .nav-link {
            color: white !important;
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 10px 15px !important;
        }
        .nav-link:hover {
            background-color: rgba(255,255,255,0.2);
            border-radius: 5px;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 82, 118, 0.8), rgba(22, 160, 133, 0.8)), url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            padding: 40px;
            margin-bottom: 30px;
            transition: transform 0.3s ease;
        }
        .content-section:hover {
            transform: translateY(-5px);
        }
        h1, h2, h3 {
            color: var(--primary-blue);
            margin-bottom: 20px;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--ocean-teal);
            padding-bottom: 15px;
            text-align: center;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--coral-orange);
            padding-left: 15px;
            margin-top: 40px;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--deep-navy);
            margin-top: 30px;
        }
        .feature-icon {
            color: var(--ocean-teal);
            margin-right: 10px;
            font-size: 1.2rem;
        }
        .game-image {
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            margin: 25px 0;
            transition: transform 0.4s ease;
            width: 100%;
            height: auto;
        }
        .game-image:hover {
            transform: scale(1.02);
        }
        .highlight-box {
            background: linear-gradient(135deg, #e8f4f8 0%, #d1ecf1 100%);
            border-left: 5px solid var(--ocean-teal);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 10px 10px 0;
        }
        .key-feature {
            background: white;
            border-radius: 10px;
            padding: 20px;
            margin: 15px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }
        .key-feature:hover {
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
            transform: translateY(-3px);
        }
        footer {
            background: var(--deep-navy);
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--ocean-teal);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
            z-index: 1000;
            text-decoration: none;
        }
        .back-to-top:hover {
            background: var(--primary-blue);
            transform: translateY(-5px);
            color: white;
        }
        @media (max-width: 768px) {
            .logo-text {
                font-size: 1.8rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .hero-section {
                padding: 60px 0;
            }
            .content-section {
                padding: 25px;
            }
        }
        .marine-life-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .marine-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
        }
        .marine-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        }
        .card-content {
            padding: 20px;
        }
        .quote-section {
            font-style: italic;
            border-left: 4px solid var(--sand-beige);
            padding-left: 20px;
            margin: 30px 0;
            color: #555;
            background: #fff9e6;
            padding: 20px;
            border-radius: 0 10px 10px 0;
        }