:root {
    --primary-color: #2563eb;
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

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

.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card-content {
    padding: 20px;
}

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

.card-content p {
    font-size: 0.9rem;
    color: #64748b;
}

.card-content span {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 0.8rem;
    text-transform: uppercase;
}