.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: max(28px, env(safe-area-inset-top));
  padding-bottom: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  text-decoration: none;
}

.brand-mark {
  display: block;
}

.brand-word {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.03em;
  line-height: 1;
}

.brand-word .period {
  color: var(--accent-deep);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* A bordered 40px box made the toggle the heaviest thing in the topbar. It
   is a bare 16px icon now; the hit area is kept at 40px by ::after, so the
   touch target does not shrink with the visual weight. */
.theme-toggle {
  position: relative;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin-right: -4px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--fg-muted);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition:
    color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.theme-toggle::after {
  content: "";
  position: absolute;
  inset: -6px;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: var(--fg);
  background: color-mix(in oklch, var(--fg) 9%, transparent);
}

.theme-toggle:active {
  background: color-mix(in oklch, var(--fg) 14%, transparent);
}

/* Both icons occupy the same cell and cross-rotate, so the swap reads as one
   control changing state rather than two icons trading places. */
.theme-toggle svg {
  grid-area: 1 / 1;
  width: 16px;
  height: 16px;
  transition:
    opacity 0.2s var(--ease),
    transform 0.35s var(--ease);
}

.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}