:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --border: #dbe2ec;
  --primary: #2f6fed;
  --danger: #c0392b;
  --success: #16794a;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.5;
}

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

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  font-size: 18px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.nav a {
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--muted);
}

.nav a.active,
.nav a:hover {
  background: #eaf0ff;
  color: var(--primary);
}

.link-button {
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  padding: 6px 10px;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px;
}

.view h1 {
  font-size: 22px;
  margin: 0 0 16px;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 440px;
  background: var(--card);
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
}

button {
  padding: 8px 14px;
  border: 1px solid var(--primary);
  border-radius: 6px;
  background: var(--primary);
  color: #ffffff;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.secondary {
  background: var(--card);
  color: var(--muted);
  border-color: var(--border);
}

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

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 12px 0;
}

.range-button.active,
.admin-range-button.active {
  background: #eaf0ff;
  color: var(--primary);
}

.status {
  color: var(--muted);
  font-size: 13px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin: 12px 0;
}

.metrics > div {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metrics span {
  color: var(--muted);
  font-size: 13px;
}

.metrics strong {
  font-size: 20px;
}

.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

th,
td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th {
  background: #f0f4fa;
  color: var(--muted);
  font-weight: 600;
}

td button {
  margin-right: 6px;
  padding: 4px 9px;
}

.chart {
  width: 100%;
  height: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 12px 0;
}

.hint,
.empty {
  color: var(--muted);
  font-size: 14px;
}

.form-error {
  color: var(--danger);
  margin: 0;
  font-size: 14px;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: var(--success);
  color: #ffffff;
  padding: 10px 14px;
  border-radius: 8px;
  z-index: 40;
}

.toast.error {
  background: var(--danger);
}

.audit-filters input {
  min-width: 140px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}

.modal-card {
  background: var(--card);
  border-radius: 10px;
  padding: 20px;
  width: min(460px, 100%);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.modal-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

@media (max-width: 720px) {
  .container {
    padding: 16px;
  }

  .topbar {
    padding: 10px 16px;
  }

  .metrics {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }

  .form {
    max-width: none;
  }
}