/* Resetting defaults */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Body and overall layout */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
    background-color: #f1f3f6;
    color: #2c2c2e;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 40px auto;
    padding: 40px;
    background-color: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 40px rgba(0, 0, 0, 0.08);
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    color: #007aff;
    margin-bottom: 10px;
    font-weight: 600;
}

header p {
    font-size: 1.1rem;
    color: #666;
}

/* Navigation container */
.nav-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

/* Navigation items */
.nav-item {
    background-color: #ffffff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nav-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
}

.nav-link {
    display: block;
    font-size: 1.1rem;
    color: #007aff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #0051c7;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    header p {
        font-size: 1rem;
    }

    .nav-container {
        grid-template-columns: 1fr 1fr;
    }
}