:root {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
                 sans-serif;
    color: #1f2937;
    background: #f8fafc;
}

body {
    margin: 0;
    line-height: 1.6;
}

.container {
    width: min(1000px, 90%);
    margin: 0 auto;
}

header {
    background: white;
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: inherit;
}

.hero {
    padding: 5rem 0 3rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
    gap: 1.5rem;
}

article {
    background: white;
    padding: 1.5rem;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
}

footer {
    margin-top: 5rem;
    padding: 2rem 0;
    border-top: 1px solid #e5e7eb;
}