:root {
    --bg: #f6f7fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    color: var(--primary);
    text-decoration: none;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px;
}

.site-header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
}

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

nav a {
    margin-left: 12px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.card.nested {
    margin-top: 12px;
}

label {
    display: block;
    margin-bottom: 12px;
}

input, select, textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-top: 6px;
}

button, .button {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
}

button {
    margin-top: 6px;
}

.alert {
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 12px;
}

.alert.error {
    background: #fee2e2;
    color: #991b1b;
}

.alert.info {
    background: #e0f2fe;
    color: #0369a1;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th, table td {
    border-bottom: 1px solid var(--border);
    padding: 10px;
    text-align: left;
}

.site-footer {
    padding: 24px 0;
    text-align: center;
    color: var(--muted);
}