:root {
  color-scheme: light;
  --paper: #fafaf8;
  --ink: #1e1e1e;
  --muted: #70706d;
  --quiet: #999994;
  --line: #cfcfca;
  --soft-line: #e4e4df;
  --focus: #555551;
  --danger: #743f3b;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Noto Sans JP", sans-serif;
  --mono: "IBM Plex Mono", "Courier New", Courier, monospace;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--paper); }
body {
  min-height: 100%;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  text-rendering: optimizeLegibility;
}
button, textarea, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mode-switcher {
  position: fixed;
  z-index: 30;
  top: max(22px, env(safe-area-inset-top));
  left: max(24px, env(safe-area-inset-left));
  font-family: var(--mono);
}
.mode-trigger {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 5px 2px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-weight: 600;
  cursor: pointer;
}
.mode-caret { color: var(--quiet); font-size: .8em; transform: translateY(-1px); }
.mode-trigger:focus-visible,
.mode-menu button:focus-visible { outline: 1px solid var(--focus); outline-offset: 3px; }
.mode-menu {
  width: 132px;
  margin-top: 7px;
  padding: 5px;
  border: 1px solid var(--soft-line);
  background: rgba(250, 250, 248, .98);
  opacity: 0;
  transform: translateY(-3px);
  animation: menu-in 130ms ease forwards;
}
.mode-menu button {
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 8px 9px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .78rem;
  text-align: left;
  cursor: pointer;
}
.mode-menu button:hover { color: var(--ink); }
.mode-menu button[aria-current="page"] { color: var(--ink); font-weight: 600; }
.mode-menu button:not([aria-current="page"]) .mode-check { visibility: hidden; }
@keyframes menu-in { to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
  .mode-menu { animation-duration: .01ms; }
}

@media (max-width: 640px) {
  .mode-switcher {
    top: max(16px, env(safe-area-inset-top));
    left: max(20px, env(safe-area-inset-left));
  }
}