:root {
  color-scheme: light;
  --surface: #f0f1ed;
  --image-ground: #eee;
  --surface-line: #c8cbc3;
  --link-hover: #247d40;
  --button-hover: #2b2d29;
  --warning: #785c2c;
}
html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #181a18;
  --ink: #edeee8;
  --muted: #a7ada4;
  --line: #3b4039;
  --green: #68d08b;
  --surface: #222620;
  --image-ground: #222620;
  --surface-line: #444b41;
  --link-hover: #82dda0;
  --button-hover: #d4dccf;
  --warning: #dfbb78;
}
.header nav { order: 1; margin-left: auto; }
.theme-toggle {
  order: 2; position: relative; display: inline-grid; place-items: center;
  flex: 0 0 40px; width: 40px; height: 40px; padding: 0;
  border: 1px solid var(--line); border-radius: 50%;
  background: transparent; color: var(--ink); cursor: pointer;
}
.theme-toggle[hidden] { display: none; }
.theme-toggle:hover { background: var(--surface); border-color: var(--muted); }
.theme-toggle svg { grid-area: 1 / 1; width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.theme-sun { opacity: 0; transform: rotate(-45deg) scale(.7); }
.theme-moon { opacity: 1; transform: none; }
[data-theme="dark"] .theme-sun { opacity: 1; transform: none; }
[data-theme="dark"] .theme-moon { opacity: 0; transform: rotate(45deg) scale(.7); }
.button-dark:hover { color: var(--paper); }
@media (prefers-reduced-motion: no-preference) {
  body { transition: background-color 180ms ease, color 180ms ease; }
  .theme-toggle { transition: background-color 160ms ease, border-color 160ms ease, transform 160ms var(--motion-ease); }
  .theme-toggle svg { transition: opacity 180ms ease, transform 220ms var(--motion-ease); }
  .theme-toggle:active { transform: scale(.94); }
}
@media (max-width: 760px) {
  .header { gap: 8px; }
  .header .wordmark { flex: 1; min-width: 0; }
  .theme-toggle { flex-basis: 44px; width: 44px; height: 44px; }
  .header .menu-toggle { order: 3; flex: 0 0 44px; }
}