body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f5f5f5;
    color: #333;
}

.site-header,
.site-footer {
    background: #222;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

.site-nav ul {
    list-style: none;
    margin: 0;
    padding: 0.5rem 1rem;
    display: flex;
    gap: 1rem;
    background: #444;
}

.site-nav a {
    color: #fff;
    text-decoration: none;
}

.main-content {
    max-width: 960px;
    margin: 1.5rem auto;
    padding: 1rem;
    background: #fff;
    border-radius: 4px;
}

.form {
    display: grid;
    gap: 0.75rem;
    max-width: 400px;
}

.form label {
    font-weight: 600;
}

.form input[type="text"],
.form input[type="email"],
.form input[type="password"] {
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 3px;
}

.button {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 3px;
    border: none;
    background: #007bff;
    color: #fff;
    cursor: pointer;
}

.button-secondary {
    background: #6c757d;
}

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

.table th,
.table td {
    border: 1px solid #ddd;
    padding: 0.5rem;
}

.table th {
    background: #f0f0f0;
}

.alert-error {
    background: #ffdddd;
    border: 1px solid #ff8888;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border-radius: 4px;
}

.alert-success {
    background: #ddffdd;
    border: 1px solid #88ff88;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border-radius: 4px;
}