:root {
  --bg: #14161f;
  --card: #1d2030;
  --ink: #f4f5fb;
  --muted: #c3c7da;
  --accent: #ffcf4a;
  --accent-ink: #1a1400;
  --line: #3a3f5a;
  --focus: #7cc7ff;
  --warn: #ffd98a;
  --hl: #2f3a63;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f6f5f0; --card: #ffffff; --ink: #15161c; --muted: #474b5c; --accent: #1f3fd1; --accent-ink: #ffffff; --line: #c9cbd6; --focus: #b3001b; --warn: #6b4500; --hl: #fff1b8; color-scheme: light; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 1.0625rem/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-underline-offset: 0.18em; }
.skip { position: absolute; left: -9999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: 0.75rem 1rem; z-index: 10; font-weight: 700; }
.skip:focus { left: 0.5rem; top: 0.5rem; }
.site-header, main, .site-footer { max-width: 52rem; margin: 0 auto; padding: 0 1rem; }
.site-header { padding-top: 1.5rem; }
h1 { font-size: clamp(2.2rem, 7vw, 3.2rem); margin: 0 0 0.25rem; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; margin: 0 0 0.75rem; }
h3.sub { font-size: 1.1rem; margin: 1.25rem 0 0.5rem; color: var(--muted); }
.tagline { font-size: 1.15rem; margin: 0 0 0.5rem; }
.status-line { color: var(--muted); margin: 0.5rem 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 1rem; padding: 1.25rem; margin: 1rem 0; }
.hint { color: var(--muted); font-size: 0.98rem; }
.warning { color: var(--warn); font-weight: 600; }
button, select, input, textarea { font: inherit; color: inherit; }
button { background: transparent; border: 2px solid var(--line); border-radius: 0.75rem; padding: 0.7rem 1rem; min-height: 48px; cursor: pointer; color: var(--ink); }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 700; }
button.big { min-height: 72px; font-size: 1.35rem; font-weight: 700; padding: 0.8rem 1.2rem; }
button[aria-pressed="true"] { outline: 3px dashed var(--accent); outline-offset: 3px; }
button:disabled { opacity: 0.55; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.big-controls { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin: 0.75rem 0 0.25rem; }
.nav-controls { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.75rem 0 1rem; }
.nav-controls button { flex: 1 1 10rem; }
.row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: flex-end; margin: 0.5rem 0; }
.grow { flex: 1 1 14rem; }
.field { margin: 0.75rem 0; border: 0; padding: 0; }
.field.indent { margin-left: 2.25rem; }
fieldset.field { border: 1px solid var(--line); border-radius: 0.75rem; padding: 0.75rem 1rem; }
legend { font-weight: 700; padding: 0 0.25rem; }
label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.choice { display: flex; align-items: flex-start; gap: 0.6rem; margin: 0.45rem 0; }
.choice label { font-weight: 500; margin: 0; }
.choice input { width: 1.4rem; height: 1.4rem; margin: 0.15rem 0 0; flex: none; accent-color: var(--accent); }
select, input[type="text"], input[type="url"], input[type="search"], textarea { width: 100%; background: var(--bg); border: 2px solid var(--line); border-radius: 0.6rem; padding: 0.65rem 0.75rem; min-height: 48px; }
input[type="file"] { width: 100%; padding: 0.5rem 0; }
textarea { resize: vertical; line-height: 1.5; }
.range-row { display: flex; align-items: center; gap: 0.75rem; }
input[type="range"] { flex: 1; min-height: 44px; accent-color: var(--accent); }
.range-value { min-width: 3.5rem; font-variant-numeric: tabular-nums; font-weight: 700; }
.now-title { font-weight: 600; }
.now-reading { background: var(--bg); border-left: 4px solid var(--accent); padding: 0.75rem 1rem; border-radius: 0.5rem; min-height: 3rem; font-size: 1.15rem; }
.doc { padding-right: 0.25rem; }
.doc p, .doc h3, .doc h4, .doc h5, .doc h6 { padding: 0.3rem 0.5rem; border-radius: 0.4rem; margin: 0.35rem 0; }
.doc .current { background: var(--hl); box-shadow: inset 4px 0 0 var(--accent); }
.convo { list-style: none; padding: 0; margin: 0 0 0.75rem; }
.convo li { padding: 0.6rem 0.8rem; border-radius: 0.6rem; margin: 0.4rem 0; background: var(--bg); }
.convo li.me { border-left: 4px solid var(--focus); }
.convo li.bot { border-left: 4px solid var(--accent); }
.answer { background: var(--bg); border-radius: 0.6rem; padding: 0.75rem 1rem; }
.matches li { margin: 0.5rem 0; }
.matches button, .answer button { margin-top: 0.4rem; }
.load-box { margin: 1rem 0; }
progress { width: 100%; height: 1.25rem; accent-color: var(--accent); }
.keys { padding-left: 1.2rem; }
.keys li { margin: 0.3rem 0; }
kbd { border: 1px solid var(--line); border-bottom-width: 3px; border-radius: 0.35rem; padding: 0 0.4rem; font: 600 0.95rem ui-monospace, Menlo, monospace; background: var(--bg); }
.site-footer { padding: 1rem 1rem 3rem; color: var(--muted); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0; }
[hidden] { display: none !important; }
@media (max-width: 30rem) {
  .big-controls { grid-template-columns: 1fr; }
  button.big { min-height: 64px; }
  .card { padding: 1rem; }
  .field.indent { margin-left: 0; }
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
@media (forced-colors: active) {
  .doc .current { outline: 3px solid Highlight; }
  button.primary { border: 2px solid ButtonText; }
}