* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #e6f7ff;
    color: #006680;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 102, 128, 0.1);
    overflow: hidden;
}

header {
    background: linear-gradient(to right, #006680, #0099bb);
    color: white;
    padding: 20px;
}

.logo {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 10px;
    text-align: center;
}

.subtitle {
    font-style: italic;
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.1rem;
    opacity: 0.9;
}



.main-content {
    display: flex;
    min-height: 500px;
}

.content {
    flex: 3;
    padding: 30px;
    border-right: 1px solid #e0e0e0;
}

.content h2 {
    color: #006680;
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-bottom: 2px solid #0099bb;
    padding-bottom: 10px;
}

.sidebar {
    flex: 1;
    padding: 30px;
    background-color: #f5fbff;
}

.sidebar h3 {
    color: #006680;
    margin-bottom: 20px;
    font-size: 1.4rem;
}

.menu-list {
    list-style-type: none;
}

.menu-list li {
    padding: 12px 15px;
    margin-bottom: 10px;
    background-color: white;
    border-left: 4px solid #0099bb;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.menu-list li:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

footer {
    background-color: #004455;
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
}

.aquarium-display {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
}

.fish-card {
    flex: 1 1 250px;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.fish-card:hover {
    transform: translateY(-5px);
}

.fish-image {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.fish-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.fish-card:hover .fish-image img {
    transform: scale(1.05);
}

.fish-info {
    padding: 15px;
}

.fish-info h3 {
    margin-bottom: 10px;
    color: #006680;
}

.fish-info p {
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .content {
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
    }
    
    .nav-container {
        flex-wrap: wrap;
    }
    
    .nav-item {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    
    .fish-card {
        flex: 1 1 100%;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .content, .sidebar {
        padding: 20px;
    }
    
    .fish-image {
        height: 180px;
    }
}