:root {
  --bg: #f4f7fb;
  --panel: rgba(255, 255, 255, 0.88);
  --panel-strong: #ffffff;
  --line: rgba(18, 44, 88, 0.1);
  --text: #17324d;
  --muted: #5f7389;
  --primary: #1e5eff;
  --primary-strong: #1748c9;
  --accent: #d9e7ff;
  --shadow: 0 24px 70px rgba(21, 49, 84, 0.1);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
}

.theme-switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
}

.theme-switch a {
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 700;
}

.theme-switch a.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #52a7ff);
  box-shadow: 0 12px 24px rgba(30, 94, 255, 0.18);
}