:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #dde1e6;
  --text: #1c2128;
  --text-muted: #5b6470;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

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

header.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

header.topbar .brand {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 0;
}

header.topbar .brand-logo {
  height: 32px;
  width: auto;
  display: block;
  white-space: nowrap;
}

nav.tabs {
  display: flex;
  gap: 4px;
  align-self: stretch;
}

nav.tabs a {
  display: flex;
  align-items: center;
  padding: 0 14px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
}
nav.tabs a:hover {
  color: var(--text);
}
nav.tabs a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

header.topbar a.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  margin-left: auto;
}
header.topbar a.back-link:hover {
  color: var(--accent);
}

.page-title {
  font-size: 18px;
  margin: 0 0 16px;
}

main.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
}

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

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

button, .btn {
  font-size: 14px;
  font-family: inherit;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
button:hover, .btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

button.primary, .btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
button.primary:hover, .btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

button.danger {
  color: var(--danger);
  border-color: var(--danger);
}
button.danger:hover {
  background: var(--danger);
  color: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tr:last-child td {
  border-bottom: none;
}

.role-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef2ff;
  color: #3730a3;
  font-size: 12px;
  margin-right: 4px;
}

.badge-off {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #fee2e2;
  color: var(--danger);
  font-size: 12px;
}

.row-actions {
  white-space: nowrap;
}
.row-actions a {
  margin-right: 8px;
  font-size: 13px;
}
.row-actions a.delete-link {
  color: var(--danger);
}

.state-message {
  padding: 40px 0;
  text-align: center;
  color: var(--text-muted);
}

.state-message.error {
  color: var(--danger);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 12px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

form .field {
  margin-bottom: 18px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-muted);
}

input[type="text"], input[type="password"], input[type="number"], input[type="email"], select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}

.role-row {
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 10px;
}

.role-row .weight-display {
  min-width: 20px;
  text-align: center;
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.field-errors {
  background: #fee2e2;
  color: var(--danger);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 16px;
  font-size: 14px;
}
.field-errors ul {
  margin: 4px 0 0;
  padding-left: 18px;
}

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--success);
  color: #fff;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.toast.error {
  background: var(--danger);
}