:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #0ea5e9;
  --danger: #dc2626;
  --success: #16a34a;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: #0f172a;
  color: #fff;
}

.topbar .brand {
  font-weight: 600;
}

.topbar nav a {
  color: #fff;
  margin-left: 16px;
  text-decoration: none;
}

h1, h2, h3 {
  margin-top: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--border);
}

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

.table th {
  background: #f3f4f6;
}

label {
  display: block;
  margin-top: 12px;
  margin-bottom: 6px;
  font-weight: 600;
}

input, select, textarea {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  margin-top: 12px;
}

.btn:hover {
  opacity: 0.9;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  gap: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

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

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

.alert-success {
  background: #dcfce7;
  color: #166534;
}

.option {
  display: block;
  padding: 6px 0;
}

.status.success {
  color: var(--success);
  font-weight: 600;
}

.status.error {
  color: var(--danger);
  font-weight: 600;
}

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

@media (max-width: 600px) {
  .toolbar {
    flex-direction: column;
    align-items: flex-start;
  }
}