/* Stats Lab — dark, projector-first. Exact palette from the slides. */
:root {
  --bg: #0d0d0d; --panel: #141414; --blue: #3d8fef; --blue2: #1f6fc4;
  --orange: #ff9b3d; --text: #ffffff; --muted: #9a9a9a; --line: #2a2a2a;
  font-size: 20px;
}
html.presenter { font-size: 25px; }
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1rem; line-height: 1.35; min-height: 100vh; display: flex; flex-direction: column;
  -webkit-text-size-adjust: 100%;
}
button, input { font: inherit; color: inherit; }
button {
  background: #222; border: 1px solid #333; border-radius: 0.5rem; padding: 0.45rem 0.9rem;
  min-height: 44px; cursor: pointer; white-space: nowrap;
}
button:hover { background: #2b2b2b; }
button:focus-visible, input:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }
button.primary { background: var(--blue2); border-color: var(--blue); font-weight: 600; }
button.primary:hover { background: var(--blue); }
button.on { background: var(--blue); border-color: var(--blue); color: #fff; font-weight: 600; }
input[type=text], input[type=number] {
  background: #1b1b1b; border: 1px solid #333; border-radius: 0.5rem; padding: 0.4rem 0.6rem;
  min-height: 44px; width: 6.5rem;
}

/* top bar */
.topbar {
  display: flex; align-items: center; gap: 0.8rem; padding: 0.5rem 1rem; background: var(--panel);
  border-bottom: 1px solid var(--line); flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.1rem; letter-spacing: 0.02em; margin-right: 0.4rem; }
.tabs { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.tabs button { background: transparent; border-color: transparent; color: var(--muted); }
.tabs button.on { background: var(--blue2); color: #fff; border-color: var(--blue); }
.tabs .key { opacity: 0.6; font-size: 0.8em; margin-right: 0.35em; }
.topright { margin-left: auto; display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.seedchip { color: var(--muted); font-size: 0.85rem; }
.seedchip b { color: var(--text); font-weight: 600; }
html.presenter .hide-presenter { display: none !important; }

/* settings drawer */
.drawer {
  position: fixed; top: 0; right: 0; height: 100vh; width: min(24rem, 100vw); background: var(--panel);
  border-left: 1px solid var(--line); padding: 1rem; overflow: auto; z-index: 20;
  box-shadow: -8px 0 30px rgba(0,0,0,0.6); font-size: 0.9rem;
}
.drawer h2 { margin: 0 0 0.8rem; font-size: 1.1rem; }
.drawer label { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; margin: 0.45rem 0; }
.drawer input { width: 8rem; }
.drawer .row { display: flex; gap: 0.5rem; margin: 0.6rem 0; }
.drawer p { color: var(--muted); font-size: 0.85rem; }
.drawer .close { position: absolute; top: 0.6rem; right: 0.6rem; min-height: 40px; padding: 0.2rem 0.7rem; }

/* demos */
main { flex: 1; padding: 0.8rem 1rem; width: 100%; max-width: 1900px; margin: 0 auto; }
.demo[hidden] { display: none; }
.panel { background: var(--panel); border-radius: 0.8rem; padding: 0.8rem 1rem; border: 1px solid var(--line); }
.panel h2 { margin: 0 0 0.4rem; font-size: 1.05rem; font-weight: 600; color: var(--text); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
canvas { display: block; width: 100%; touch-action: manipulation; }
.sub { color: var(--muted); margin-top: 0.3rem; min-height: 1.3em; }
.sub b { color: var(--text); }
.bignum { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin: 0.2rem 0 0.5rem; }
.big { font-size: 2.6rem; font-weight: 700; line-height: 1.1; }
.big small { font-size: 0.45em; font-weight: 500; color: var(--muted); }
.formula { color: var(--muted); font-size: 1.05rem; }
.formula b { color: var(--text); }
.controls {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem; align-items: center; margin: 0.8rem 0 0.4rem;
}
.group { display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; }
.group .lbl { color: var(--muted); margin-right: 0.2rem; }
.sentence { font-size: 1.25rem; margin: 0.6rem 0 0; }
.sentence b { color: var(--orange); }
.foot { color: var(--muted); font-size: 0.85rem; margin: 0.5rem 0 0; }

/* demo 3 tiles */
.tiles { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr 1.3fr; gap: 0.6rem; align-items: stretch; margin-top: 0.8rem; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: 0.8rem; padding: 0.6rem 0.9rem; text-align: center; }
.tile .lbl { color: var(--muted); font-size: 0.95rem; }
.tile .val { font-size: 2.8rem; font-weight: 700; line-height: 1.15; }
.tile .sm { font-size: 0.95rem; color: var(--muted); margin-top: 0.2rem; }
.tile.hot { border-color: var(--orange); }
.tile.hot .val { color: var(--orange); }
.op { font-size: 2.6rem; font-weight: 300; color: var(--muted); align-self: center; text-align: center; }
.sliders { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.8rem 1.4rem; margin-top: 0.8rem; }
.slider label { display: flex; justify-content: space-between; margin-bottom: 0.2rem; }
.slider label b { font-variant-numeric: tabular-nums; }
input[type=range] { width: 100%; height: 44px; margin: 0; accent-color: var(--blue); cursor: pointer; }

.legend { display: flex; gap: 1.2rem; color: var(--muted); font-size: 0.95rem; margin-bottom: 0.2rem; }
.legend i { display: inline-block; width: 0.9em; height: 0.9em; border-radius: 0.2em; margin-right: 0.35em; vertical-align: -0.05em; }

footer { color: var(--muted); font-size: 0.85rem; padding: 0.5rem 1rem 0.8rem; border-top: 1px solid var(--line); display: flex; gap: 1.2rem; flex-wrap: wrap; }
footer kbd { background: #222; border: 1px solid #3a3a3a; border-radius: 0.3em; padding: 0 0.4em; color: var(--text); font-family: inherit; }

@media (max-width: 900px) {
  :root { font-size: 17px; }
  .two { grid-template-columns: 1fr; }
  .tiles { grid-template-columns: 1fr 1fr; }
  .op { display: none; }
  .sliders { grid-template-columns: 1fr; }
  .big { font-size: 2.2rem; }
  .topright { margin-left: 0; width: 100%; }
}
.seg { display: inline-flex; gap: 0.35rem; flex-wrap: wrap; }