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

body {
    background-color: #f5f7fa;
    color: #333;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    width: 90%;
    max-width: 600px;
    text-align: center;
}

h1 {
    margin-bottom: 2rem;
    color: #2c3e50;
    font-size: 2rem;
}

.button-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.nav-button {
    background-color: #ffffff;
    border: 2px solid #e0e6ed;
    border-radius: 10px;
    padding: 1.5rem;
    width: 180px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.nav-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border-color: #3498db;
}

.icon {
    font-size: 2.5rem;
    margin-bottom: 0.8rem;
}

.label {
    font-weight: 600;
    font-size: 1.1rem;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .button-container {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-button {
        width: 100%;
        max-width: 220px;
    }
}

/* Dark mode styles */
body.dark-mode {
    background-color: #1e1e1e;
    color: #f5f5f5;
}

.container.dark-mode {
    background-color: #2c2c2c;
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.1);
}

.nav-button.dark-mode {
    background-color: #333;
    border-color: #555;
    color: #f5f5f5;
}

.nav-button.dark-mode:hover {
    border-color: #3498db;
    box-shadow: 0 8px 16px rgba(255, 255, 255, 0.2);
}

/* Toggle button styles */
.toggle-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 20px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.toggle-button:hover {
    background-color: #1d6fa5;
}