.site-color-mode-toggle {
  position: fixed;
  right: max(12px, env(safe-area-inset-right));
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-width: 44px;
  min-height: 44px;
  padding: 8px 11px;
  border: 1px solid color-mix(in srgb, currentColor 42%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper, #fff) 94%, transparent);
  color: var(--ink, #06131f);
  box-shadow: 0 8px 24px rgba(6, 19, 31, 0.18);
  font-family: var(--font-mono, "SF Mono", Menlo, Consolas, monospace);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
  cursor: pointer;
}

.site-color-mode-toggle:hover,
.site-color-mode-toggle:focus-visible {
  border-color: var(--signal, #0b63ce);
  color: var(--signal, #0b63ce);
  outline: 2px solid var(--signal, #0b63ce);
  outline-offset: 2px;
}

.site-color-mode-toggle-icon {
  position: relative;
  width: 12px;
  height: 12px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.site-color-mode-toggle-icon::after {
  position: absolute;
  inset: 2px 2px 2px 5px;
  border-radius: 0 999px 999px 0;
  background: currentColor;
  content: "";
}

html[data-color-mode="light"] { color-scheme: light; }

html[data-color-mode="dark"] {
  color-scheme: dark;
  --ink: #edf4fa;
  --ink-rgb: 237, 244, 250;
  --paper: #0d1b28;
  --page: #07121c;
  --surface: #102536;
  --surface-rgb: 16, 37, 54;
  --subtle: #10202e;
  --soft: #162a3b;
  --line: #2b4154;
  --muted: #afbdc9;
  --muted-strong: #d4dee7;
  --signal: #7cbcff;
  --signal-soft: rgba(124, 188, 255, 0.16);
  background: #07121c;
}

html[data-color-mode="dark"] body {
  background: var(--page) !important;
  color: var(--ink);
}

html[data-color-mode="dark"] .site-header {
  background: #091722 !important;
  box-shadow: inset 0 -1px 0 rgba(237, 244, 250, 0.16);
}

html[data-color-mode="dark"] .site-header .brand-lockup,
html[data-color-mode="dark"] .site-header .brand-symbol,
html[data-color-mode="dark"] .site-header .brand-wordmark {
  filter: brightness(0) invert(1);
}

html[data-color-mode="dark"] .site-header .nav-menu,
html[data-color-mode="dark"] input,
html[data-color-mode="dark"] textarea,
html[data-color-mode="dark"] select {
  border-color: rgba(237, 244, 250, 0.3);
  background-color: var(--paper);
  color: var(--ink);
}

html[data-color-mode="dark"] .site-footer {
  background: linear-gradient(180deg, #0d1b28 0%, #07121c 62%) !important;
  color: var(--ink);
  box-shadow: inset 0 1px 0 rgba(237, 244, 250, 0.12);
}

html[data-color-mode="dark"] .hero {
  background: linear-gradient(180deg, #0d1b28 0%, #0a1824 48%, #07121c 100%);
}

html[data-color-mode="dark"] .hero::before {
  background:
    linear-gradient(90deg, rgba(7, 18, 28, 0.94) 0%, rgba(7, 18, 28, 0.72) 34%, rgba(7, 18, 28, 0.08) 72%),
    linear-gradient(180deg, rgba(7, 18, 28, 0.48) 0%, rgba(7, 18, 28, 0.08) 58%);
}

html[data-color-mode="dark"] .hero::after {
  background: linear-gradient(180deg, rgba(7, 18, 28, 0.08), rgba(7, 18, 28, 0.7));
  mix-blend-mode: normal;
  opacity: 1;
}

html[data-color-mode="dark"] .hero-inkscape {
  filter: brightness(0.42) contrast(1.12);
}

html[data-color-mode="dark"] .hero-actions .button.tertiary {
  border-color: rgba(237, 244, 250, 0.38);
  background: rgba(13, 27, 40, 0.72);
  color: var(--muted);
}

html[data-color-mode="dark"] .site-color-mode-toggle {
  border-color: rgba(237, 244, 250, 0.42);
  background: rgba(13, 27, 40, 0.94);
  color: var(--ink);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.42);
}

@media (max-width: 420px) {
  .site-color-mode-toggle {
    right: max(8px, env(safe-area-inset-right));
    bottom: max(8px, env(safe-area-inset-bottom));
    padding-inline: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-color-mode-toggle { transition: none !important; }
}