body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: #f4f6f9;
    color: #333;
}

header {
    background-color: #1e293b;
    color: #fff;
    padding: 1rem 2rem;
}

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

.logo {
    font-weight: bold;
    font-size: 1.25rem;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: #fff;
}

main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.card h3 {
    margin: 0 0 0.5rem 0;
    font-size: 0.9rem;
    color: #64748b;
}

.card .stat {
    margin: 0;
    font-size: 1.5rem;
    font-weight: bold;
    color: #0f172a;
}

.view-section {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.action-bar {
    margin-bottom: 1rem;
}

.btn-primary {
    background-color: #3b82f6;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.btn-primary:hover {
    background-color: #2563eb;
}

.btn-delete {
    background-color: #ef4444;
    color: white;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.data-table th, .data-table td {
    padding: 0.75rem;
    border-bottom: 1px solid #e2e8f0;
    text-align: left;
}

.data-table th {
    background-color: #f8fafc;
    color: #475569;
}