:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #697386;
  --line: #d9dee8;
  --line-strong: #b7c0d2;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #15803d;
  --danger: #b91c1c;
  --warning-bg: #fff7ed;
  --warning-border: #fdba74;
}

* {
  box-sizing: border-box;
}

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

.topbar {
  align-items: center;
  background: #111827;
  color: #fff;
  display: flex;
  justify-content: space-between;
  padding: 16px 28px;
}

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

.subtle {
  color: #aeb7c7;
  font-size: 12px;
  margin-top: 4px;
}

.nav {
  background: #fff;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 4px;
  padding: 0 24px;
}

.nav a {
  color: var(--muted);
  padding: 12px 10px;
  text-decoration: none;
}

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

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

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 20px;
  padding: 18px;
}

.login-panel {
  margin: 70px auto;
  max-width: 420px;
}

h1 {
  font-size: 18px;
  margin: 0 0 16px;
}

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

.metrics {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(5, minmax(120px, 1fr));
  margin-bottom: 20px;
}

.metric {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.metric span {
  color: var(--muted);
  display: block;
  font-size: 12px;
}

.metric strong {
  display: block;
  font-size: 28px;
  margin-top: 8px;
}

.section-head {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.form-grid,
.inline-form,
.compact-filter,
.row-actions {
  display: flex;
  gap: 12px;
}

.form-grid {
  flex-direction: column;
}

.inline-form {
  align-items: end;
  flex-wrap: wrap;
}

label span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  margin-bottom: 5px;
}

input,
select,
textarea {
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  color: var(--text);
  font: inherit;
  min-height: 36px;
  padding: 7px 9px;
}

textarea {
  height: 130px;
  resize: vertical;
  width: 100%;
}

button,
.button-link {
  background: var(--primary);
  border: 1px solid var(--primary);
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  display: inline-block;
  font: inherit;
  min-height: 36px;
  padding: 7px 14px;
  text-decoration: none;
}

button:hover,
.button-link:hover {
  background: var(--primary-hover);
}

.ghost {
  background: transparent;
  border-color: #4b5563;
}

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

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

th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

code {
  background: #f1f5f9;
  border-radius: 4px;
  padding: 2px 4px;
}

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

.tag.available,
.tag.applied {
  background: #dcfce7;
  color: var(--success);
}

.tag.redeemed,
.tag.pending {
  background: #fef3c7;
  color: #92400e;
}

.tag.disabled,
.tag.cancelled {
  background: #fee2e2;
  color: var(--danger);
}

.alert {
  border-radius: 8px;
  margin-bottom: 16px;
  padding: 12px 14px;
}

.alert.danger {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--danger);
}

.alert.warning {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: #9a3412;
}

.generated {
  margin-top: 16px;
}

.empty {
  color: var(--muted);
  padding: 24px 8px;
  text-align: center;
}

.filters {
  margin-bottom: 12px;
}

.row-actions {
  align-items: center;
}

@media (max-width: 860px) {
  .metrics {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }

  .nav {
    overflow-x: auto;
  }

  .section-head,
  .inline-form {
    align-items: stretch;
    flex-direction: column;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}