:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10151f;
  --panel: #181f2c;
  --field: #101724;
  --border: #293449;
  --text: #eef4ff;
  --muted: #aebbd0;
  --accent: #72a9ff;
  --accent-text: #071426;
  --tag: #263956;
  --tag-text: #c9d9f5;
  --hover-panel: #1e293b;
  --link: #9fc3ff;
  --home-glow: #203759;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --field: #f8fafc;
  --border: #cfd8e5;
  --text: #172033;
  --muted: #5d6a7d;
  --accent: #276bc5;
  --accent-text: #ffffff;
  --tag: #e7effb;
  --tag-text: #234a81;
  --hover-panel: #f0f5fc;
  --link: #1b5fb9;
  --home-glow: #d9e9ff;
}

.form-check {
  display: inline-flex;
  align-items: center;
}

.form-switch {
  gap: 8px;
}

.form-check-input {
  appearance: none;
  width: 40px;
  height: 20px;
  min-height: 0;
  margin: 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--field);
  background-image: radial-gradient(circle at 8px 50%, var(--muted) 0 7px, transparent 8px);
  background-repeat: no-repeat;
  cursor: pointer;
  font: inherit;
  transition: background .15s, border-color .15s;
}

.form-check-input:checked {
  border-color: var(--accent);
  background: var(--accent);
  background-image: radial-gradient(circle at calc(100% - 8px) 50%, var(--accent-text) 0 7px, transparent 8px);
}

.form-check-input:hover,
.form-check-input:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.form-check-label {
  color: var(--text);
  font-size: .82rem;
  font-weight: 700;
  cursor: pointer;
}

.theme-switch {
  min-height: 36px;
  padding: 0;
}

.site-nav .theme-switch { margin-left: auto; }

.site-nav .form-check-input {
  min-height: 0;
  padding: 0;
  border-radius: 999px;
  background-color: var(--field);
}

.site-nav .form-check-input:checked { background-color: var(--accent); }