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

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #0f172a;
    color: #f8fafc;
}

header {
    background: #1e293b;
    padding: 20px 30px;
    border-bottom: 1px solid #334155;
}

header h1 {
    font-size: 28px;
    font-weight: 600;
}

main {
    padding: 30px;
}

.welcome {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 25px;
}

.welcome h2 {
    margin-bottom: 10px;
}

.modules {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 20px;
    transition: .2s;
}

.card:hover {
    border-color: #3b82f6;
    transform: translateY(-2px);
}

.card h3 {
    margin-bottom: 12px;
}

.card p {
    color: #cbd5e1;
}