:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --border: #e3e8ef;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --green: #059669;
  --yellow: #b45309;
  --red: #dc2626;
  --gray: #6b7280;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  font-size: 14px;
}

.topbar {
  background: #111827;
  color: #fff;
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.card:hover {
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.12);
}

.card-value {
  font-size: 28px;
  font-weight: 700;
}

.card-label {
  color: var(--muted);
  margin-top: 4px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 18px;
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.panel-head h2 {
  margin: 0;
  font-size: 15px;
}

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

.input {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
  background: #fff;
  color: var(--text);
}

.input:focus {
  outline: 2px solid rgba(37, 99, 235, 0.3);
  border-color: var(--primary);
}

.search {
  min-width: 220px;
}

.table-wrap {
  overflow-x: auto;
}

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

th, td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

th {
  color: var(--muted);
  font-weight: 600;
  background: #fafbfc;
  white-space: nowrap;
}

tbody tr:hover {
  background: #f9fafb;
}

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

.btn {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 7px 14px;
  font: inherit;
  cursor: pointer;
  background: #fff;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
}

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

.btn.outline {
  border-color: var(--border);
  color: var(--text);
}

.btn.outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn.danger {
  color: var(--red);
  border-color: #fecaca;
  background: #fff;
}

.btn.danger:hover {
  background: #fef2f2;
  border-color: var(--red);
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.badge.pending { background: #fef3c7; color: var(--yellow); }
.badge.active { background: #d1fae5; color: var(--green); }
.badge.expired { background: #fee2e2; color: var(--red); }
.badge.revoked { background: #e5e7eb; color: var(--gray); }

.device-name {
  font-weight: 600;
}

.device-id {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.col-actions {
  min-width: 150px;
}

.actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.hint {
  margin: 0;
  padding: 10px 18px;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

.settings {
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 20px;
}

.settings .form-row {
  margin-top: 10px;
}

.settings .form-row:first-child {
  margin-top: 0;
}

.hint-inline {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.settings-actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

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

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 16px;
}

.modal-backdrop.hidden {
  display: none;
}

.modal {
  background: #fff;
  border-radius: 12px;
  padding: 22px;
  width: 100%;
  max-width: 460px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
}

.modal h3 {
  margin: 0 0 4px;
}

.form-row {
  margin-top: 14px;
}

.form-row label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

.form-row .input {
  width: 100%;
}

textarea.input {
  resize: vertical;
}

.modal-actions {
  margin-top: 20px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

@media (max-width: 720px) {
  .settings { grid-template-columns: 1fr; }
  .panel-head { align-items: stretch; flex-direction: column; }
  .toolbar { width: 100%; }
  .search { flex: 1; }
}