:root {
    --bg: #f7f9fc;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-600: #1d4ed8;
    --danger: #b00020;
    --border: #e5e7eb;
    --shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
    --radius: 12px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
}

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

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px 24px;
}

h1, h2 {
    margin-top: 0;
}

nav {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

nav a {
    text-decoration: none;
    color: var(--primary);
    font-weight: 600;
}

nav a:hover {
    color: var(--primary-600);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 8px 14px;
    cursor: pointer;
    font-weight: 600;
}

.btn:hover { background: var(--primary-600); }

.btn-link {
    background: transparent;
    color: var(--primary);
    border: none;
    padding: 0;
    cursor: pointer;
    font-weight: 600;
}

.btn-danger { background: #dc2626; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

label {
    display: block;
    font-weight: 600;
    margin: 8px 0 6px;
}

input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

th, td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}

th {
    text-align: left;
    background: #f3f4f6;
}

.error {
    color: var(--danger);
    background: #fee2e2;
    border: 1px solid #fecaca;
    padding: 10px 12px;
    border-radius: 10px;
}

.muted { color: var(--muted); }

.actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

@media (max-width: 700px) {
    .form-row { grid-template-columns: 1fr; }
}