/* Aviation Project CSS - Clean Version */
:root {
    --primary: #2563eb;
    --secondary: #7c3aed;
    --light: #f8fafc;
    --dark: #1f2937;
    --gray: #6b7280;
}

body {
    font-family: Arial, sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    line-height: 1.6;
}

.header {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 30px;
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.nav-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border-left: 4px solid var(--primary);
}

.nav-card h3 {
    color: var(--primary);
    margin-top: 0;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
}

pre {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: var(--gray);
}