:root {
    --primary: #1d1d1f;
    --accent: #007aff;
    --bg: #f5f5f7;
    --card: #ffffff;
}

body {
    margin: 0;
    background-color: var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--primary);
}

header {
    padding: 40px 20px 10px;
    text-align: center;
}

header img {
    height: 60px;
}

header h1 {
    font-size: 2.2em;
    margin: 10px 0 5px;
}

header p {
    font-size: 1em;
    color: #666;
}

.main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 30px 5%;
    max-width: 1400px;
    margin: auto;
}

.card {
    background-color: var(--card);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.card h3 {
    margin-top: 0;
    font-size: 1.2em;
    margin-bottom: 15px;
    border-bottom: 1px solid #eee;
    padding-bottom: 5px;
}

.card ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.card ul li {
    margin: 8px 0;
}

.card a {
    color: var(--accent);
    text-decoration: none;
}

.card a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 20px 10px;
    font-size: 0.9em;
    color: #666;
    margin-top: 40px;
}