body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: #f7f9fc;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header, footer {
    background-color: #222;
    color: #fff;
    text-align: center;
    padding: 1.2rem;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: start;
    padding: 2rem;
}

.docs-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 900px;
}

.doc-card {
    display: flex;
    justify-content: center;
    align-items: center;
    background: white;
    border-radius: 12px;
    padding: 2rem;
    font-size: 1.5rem;
    text-decoration: none;
    color: #222;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.doc-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
    background-color: #f0f0f0;
}