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

body {
    font-family: Arial, sans-serif;
    background-color: #f7f8fc;
    color: #333;
}

header {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, #007acc, #005fa3);
    color: white;
    border-bottom: 5px solid #005fa3;
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2em;
    opacity: 0.9;
}

main {
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.download-section h2 {
    font-size: 2em;
    margin-bottom: 30px;
    color: #333;
}

.os-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.os-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 30px 20px;
    width: 280px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.os-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.os-icon {
    width: 50px;
    margin-bottom: 15px;
}

.os-card h3 {
    margin: 10px 0;
    color: #007acc;
}

.download-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 12px 24px;
    background-color: #007acc;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.3s;
}

.download-btn:hover {
    background-color: #005fa3;
    transform: scale(1.05);
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #333;
    color: white;
    font-size: 0.9em;
}