*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #f8f9fa;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #dee2e6;
}

header h1 {
    margin: 0 0 0.5rem;
    font-size: 1.75rem;
}

nav a {
    color: #0d6efd;
    text-decoration: none;
    margin-right: 1rem;
}

nav a:hover {
    text-decoration: underline;
}

main {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

footer {
    margin-top: 2rem;
    font-size: 0.875rem;
    color: #6c757d;
}

.site1 header h1 {
    color: #0d6efd;
}

.site2 header h1 {
    color: #198754;
}

.error-page h1 {
    color: #dc3545;
}