:root {
  --bg: #0b0d12; --panel: #12161f; --card: #1a1f2c; --line: #2a3142;
  --text: #e9edf5; --muted: #9aa3b5; --accent: #ffc629; --ok: #34d399; --danger: #ff6b78; --info: #6aa8ff;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: 'Heebo', system-ui, -apple-system, 'Segoe UI', Arial, sans-serif; font-size: 16.5px; line-height: 1.75;
}
.wrap { max-width: 900px; margin: 0 auto; padding: 0 20px 80px; }
header.hero {
  padding: 48px 20px 36px; text-align: center; border-bottom: 1px solid var(--line);
  background: radial-gradient(800px 300px at 50% -40%, rgba(255, 198, 41, .18), transparent 70%), var(--panel);
}
header.hero img { width: 72px; height: 72px; border-radius: 18px; }
header.hero h1 { margin: 12px 0 4px; font-size: 32px; font-weight: 800; }
header.hero h1 span { color: var(--accent); }
header.hero p { margin: 0; color: var(--muted); }
.toc { margin: 28px 0; padding: 18px 22px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
.toc b { display: block; margin-bottom: 6px; }
.toc ol { margin: 0; padding-inline-start: 22px; columns: 2; column-gap: 32px; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }
h2 {
  margin: 48px 0 12px; font-size: 24px; font-weight: 800; padding-bottom: 8px; border-bottom: 2px solid var(--line);
  scroll-margin-top: 16px;
}
h2 .n { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-inline-end: 10px; border-radius: 10px; background: var(--accent); color: #1a1400; font-size: 18px; vertical-align: 2px; }
h3 { margin: 26px 0 6px; font-size: 18.5px; color: var(--accent); }
a { color: var(--accent); }
p, li { color: var(--text); }
ol.steps, ul { padding-inline-start: 24px; }
ol.steps li { margin: 6px 0; }
.btn {
  display: inline-flex; align-items: center; gap: 4px; padding: 0 9px; border-radius: 7px; white-space: nowrap;
  background: var(--card); border: 1px solid var(--line); font-weight: 700; font-size: 14.5px; line-height: 1.8;
}
.btn.y { background: var(--accent); color: #1a1400; border-color: var(--accent); }
.btn.r { color: var(--danger); border-color: rgba(255, 107, 120, .5); }
kbd {
  display: inline-block; min-width: 26px; padding: 0 7px; border-radius: 6px; text-align: center;
  background: #262d3d; border: 1px solid #3a4358; border-bottom-width: 3px; font-family: inherit; font-size: 14px; font-weight: 700;
}
code, pre { font-family: ui-monospace, Consolas, 'Courier New', monospace; direction: ltr; }
code { background: #1f2533; padding: 1px 6px; border-radius: 5px; font-size: 14px; unicode-bidi: embed; }
pre {
  background: #070910; border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; overflow-x: auto;
  font-size: 14px; line-height: 1.6; text-align: left; color: #d7e0f0;
}
pre .c { color: #6b778f; }
.note, .tip, .warn {
  margin: 16px 0; padding: 12px 16px; border-radius: 10px; border-inline-start: 4px solid;
}
.note { background: rgba(106, 168, 255, .08); border-color: var(--info); }
.tip { background: rgba(52, 211, 153, .08); border-color: var(--ok); }
.warn { background: rgba(255, 107, 120, .08); border-color: var(--danger); }
.note b:first-child, .tip b:first-child, .warn b:first-child { display: block; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
th, td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: start; vertical-align: top; }
th { background: var(--panel); color: var(--muted); font-weight: 600; }
.screen {
  margin: 16px 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--panel);
}
.screen .bar { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; padding: 10px 12px; background: #161b26; border-bottom: 1px solid var(--line); }
.screen .bar .t { color: var(--accent); font-weight: 800; margin-inline-end: auto; }
.screen .body { display: grid; grid-template-columns: 1fr 180px; min-height: 150px; }
.screen .vid { background: #000; display: grid; place-items: center; color: #555; font-size: 14px; }
.screen .list { padding: 8px; display: flex; flex-direction: column; gap: 5px; }
.screen .list span { background: var(--card); border-radius: 7px; padding: 3px 8px; font-size: 13px; }
.screen .list span.on { outline: 1px solid var(--accent); }
footer { margin-top: 60px; color: var(--muted); font-size: 14px; text-align: center; }
.back { position: fixed; bottom: 18px; left: 18px; padding: 8px 14px; border-radius: 10px; background: var(--card); border: 1px solid var(--line); text-decoration: none; font-weight: 600; }
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .toc ol { columns: 1; }
  header.hero h1 { font-size: 26px; }
  .screen .body { grid-template-columns: 1fr; }
}
@media print {
  :root { --bg: #fff; --panel: #f4f5f8; --card: #eef0f4; --line: #d5d9e2; --text: #111; --muted: #555; --accent: #a36b00; }
  .back, .toc { display: none; }
  pre { background: #f6f7f9; color: #111; }
  h2 { break-after: avoid; }
}