/* Общие стили демо. Палитра - из генератора схем курса (_build_png.py, модули 9-17). */
:root {
  --bg: #0a0e1a;
  --panel: #161b2e;
  --panel-2: #1d2440;
  --line: #2a3150;
  --ink: #f5f7fa;
  --muted: #9aa0a6;
  --cyan: #22d3ee;
  --purple: #a855f7;
  --green: #34d399;
  --orange: #f97316;
  --yellow: #fbbf24;
  --red: #ef4444;
  --cell: 40px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 14px 16px;
}
.mono, code, input, output, .matrix, .readout {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "DejaVu Sans Mono", monospace;
}

.eyebrow { margin: 0; color: var(--muted); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
h1 { margin: 2px 0 12px; font-size: 19px; font-weight: 600; line-height: 1.25; }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.row--spread { justify-content: space-between; }
.row--top { margin-top: 8px; }

button {
  font: inherit; font-size: 13.5px; color: var(--ink);
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px;
  padding: 6px 11px; cursor: pointer;
}
button:hover { border-color: var(--cyan); }
button:disabled { opacity: .45; cursor: default; }
button:focus-visible, input:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--yellow); outline-offset: 2px; }
.chip[aria-pressed="true"] { border-color: var(--cyan); color: var(--cyan); }
.btn-play { border-color: var(--orange); color: var(--orange); }
.btn-play[aria-pressed="true"] { background: var(--orange); color: var(--bg); }

.slider-holder { flex: 1 1 160px; min-width: 140px; }
.slider { display: grid; gap: 2px; }
.slider__top { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); }
.slider__value { color: var(--ink); }
.slider input { width: 100%; accent-color: var(--cyan); }

.matrix { display: inline-grid; gap: 4px; }
.matrix__cell {
  width: var(--cell); height: 34px; display: grid; place-items: center;
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px;
  color: var(--ink); font: inherit; font-size: 14px; text-align: center; padding: 0;
  transition: background .2s, border-color .2s, color .2s;
}
.matrix__cell.is-row { border-color: var(--cyan); background: rgba(34, 211, 238, .14); }
.matrix__cell.is-col { border-color: var(--purple); background: rgba(168, 85, 247, .16); }
.matrix__cell.is-hit { border-color: var(--orange); background: rgba(249, 115, 22, .2); color: var(--orange); }
.matrix__cell.is-invalid { border-color: var(--red); color: var(--red); }

.readout { margin: 0; font-size: 14px; overflow-wrap: anywhere; }
.caption { min-height: 21px; margin: 6px 0 0; font-size: 14px; color: var(--yellow); }
.verdict { margin: 0; font-weight: 600; }
.error { margin: 0; color: var(--red); font-size: 14px; }
.good { color: var(--green); }
.bad { color: var(--red); }
.muted { color: var(--muted); }
.home-link { display: inline-block; margin-bottom: 8px; font-size: 13px; color: var(--cyan); text-decoration: none; }
.home-link:hover, .home-link:focus-visible { text-decoration: underline; }
.locked p { margin: 0 0 10px; line-height: 1.55; }
.cta { display: inline-block; margin-top: 4px; padding: 9px 16px; border-radius: 8px; font-weight: 600;
  color: var(--bg); background: var(--cyan); text-decoration: none; }
.cta:hover, .cta:focus-visible { filter: brightness(1.12); outline: none; }

noscript .panel { color: var(--red); }

@media (max-width: 520px) {
  body { padding: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}