/* jabascript навігатор — згенеровано scripts/build_website.py */
:root {
  --bg: #0d1117; --surface: #151b23; --surface-2: #1b232e;
  --text: #e5e9ee; --muted: #8b96a5; --border: #27313d;
  --h: 215; /* per-track accent hue, overridden inline */
  --acc-s: 75%; --acc-l: 62%; --acc-bg-l: 55%;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
:root[data-theme="light"] {
  --bg: #faf7f2; --surface: #ffffff; --surface-2: #f1ede5;
  --text: #1c2128; --muted: #636e7b; --border: #e2dcd1;
  --acc-s: 65%; --acc-l: 42%; --acc-bg-l: 45%;
}
/* derived per element so an inline --h (track cards, body) re-evaluates them */
* {
  --accent: hsl(var(--h) var(--acc-s) var(--acc-l));
  --accent-dim: hsl(var(--h) 45% 45% / .38);
  --accent-bg: hsl(var(--h) 60% var(--acc-bg-l) / .12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; }
h2 { margin-top: 2.2em; font-size: 1.45rem; }
code { font-family: var(--mono); font-size: .88em; background: var(--surface-2); padding: .1em .35em; border-radius: 4px; }
.mono { font-family: var(--mono); font-size: .82rem; letter-spacing: 0; }
.meta { color: var(--muted); }
.eyebrow { color: var(--muted); text-transform: lowercase; margin: 0 0 .6rem; }
.eyebrow a { color: var(--muted); }
main { max-width: 1060px; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }

/* header / footer */
.site-head {
  display: flex; align-items: center; gap: 1.5rem;
  max-width: 1060px; margin: 0 auto; padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.brand { color: var(--text); font-weight: 650; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: .8em; }
.brand-dim { color: var(--muted); font-weight: 400; }
.site-head nav { display: flex; gap: 1.1rem; margin-left: auto; }
.site-head nav a { color: var(--muted); font-size: .92rem; }
.site-head nav a.active, .site-head nav a:hover { color: var(--text); text-decoration: none; }
#theme-toggle {
  background: none; border: 1px solid var(--border); color: var(--muted);
  border-radius: 50%; width: 2rem; height: 2rem; cursor: pointer; font-size: .95rem;
}
#theme-toggle:hover { color: var(--text); border-color: var(--muted); }
.site-foot {
  max-width: 1060px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--border); color: var(--muted); font-size: .88rem;
}

/* hero */
.hero { padding: 3rem 0 1rem; }
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.9rem); margin: .4rem 0 1.2rem;
  font-weight: 750; letter-spacing: -0.035em;
}
.lede { max-width: 46rem; font-size: 1.08rem; color: var(--muted); }
.stats { display: flex; flex-wrap: wrap; gap: 1.6rem; margin: 1.8rem 0; color: var(--muted); }
.stats b { color: var(--text); font-weight: 600; margin-right: .3em; }
.cta {
  display: inline-block; margin-top: .4rem; padding: .7rem 1.1rem;
  border: 1px solid var(--accent-dim); border-radius: 8px;
  background: var(--accent-bg); color: var(--text); font-weight: 550;
}
.cta:hover { text-decoration: none; border-color: var(--accent); }
.cta-row { display: flex; flex-wrap: wrap; gap: .7rem; align-items: center; }
/* books accent — warm "paper" hue, distinct from every track colour */
.cta-books {
  --h: 34; --acc-s: 60%;
  border-color: hsl(34 55% 50% / .5); background: hsl(34 60% 50% / .13);
}
.cta-books:hover { border-color: hsl(34 60% 55%); }

/* books banner */
.books-banner {
  --h: 34; --acc-s: 60%;
  display: flex; align-items: center; gap: 1.3rem; flex-wrap: wrap;
  margin: 3.2rem 0 1rem; padding: 1.5rem 1.7rem;
  background: hsl(34 55% 50% / .10); border: 1px solid hsl(34 50% 50% / .32);
  border-left: 4px solid hsl(34 60% 52%); border-radius: 12px;
}
.books-banner-glyph { font-size: 2.6rem; line-height: 1; }
.books-banner-body { flex: 1; min-width: 15rem; }
.books-banner-body h2 { margin: 0 0 .3rem; font-size: 1.4rem; }
.books-banner-body p { margin: 0; color: var(--muted); max-width: 42rem; }
.books-banner .cta { margin-top: 0; white-space: nowrap; }

/* how-to */
.how-list { max-width: 46rem; padding-left: 1.2rem; color: var(--muted); }
.how-list li { margin: .45rem 0; }
.how-list b { color: var(--text); }

/* track cards */
.track-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.track-card {
  position: relative; display: flex; flex-direction: column; gap: .35rem;
  background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 10px; padding: 1.2rem 1.2rem 1rem; color: var(--text);
  transition: border-color .15s, transform .15s;
}
.track-card:hover { text-decoration: none; border-color: var(--accent-dim); border-left-color: var(--accent); transform: translateY(-2px); }
.track-no { font-family: var(--mono); color: var(--accent); font-size: .85rem; }
.track-card h3 { margin: 0; font-size: 1.18rem; }
.track-card p { margin: 0; color: var(--muted); font-size: .92rem; flex: 1; }
.track-card .meta { margin-top: .6rem; }

/* progress bars */
.progress { height: 3px; background: var(--surface-2); border-radius: 2px; margin-top: .55rem; overflow: hidden; }
.progress span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .3s; }
.progress.big { height: 5px; max-width: 24rem; margin: 1rem 0 0; }

/* knowledge map */
.map-hint { max-width: 46rem; margin-top: -.6rem; }
.map-scroll { overflow-x: auto; margin-top: 1.2rem; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.map { position: relative; min-width: 980px; aspect-ratio: 1150 / 900; }
.map svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.map svg line { stroke: var(--muted); stroke-opacity: .22; stroke-width: 1; vector-effect: non-scaling-stroke; }
.map-chip {
  position: absolute; transform: translate(-50%, -50%);
  max-width: 210px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: .72rem; line-height: 1; padding: .45em .75em; border-radius: 99px;
  background: var(--bg); border: 1px solid var(--accent-dim); color: var(--accent);
}
.map-chip.hot { background: var(--accent-bg); border-color: var(--accent); font-weight: 600; }
.map-chip:hover { text-decoration: none; border-color: var(--accent); color: var(--text); z-index: 2; }

/* track page stepper */
.track-page h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); margin: .2rem 0 .5rem; }
.track-intro { max-width: 50rem; color: var(--muted); margin-top: 1.4rem; }
.stepper { list-style: none; margin: 1.5rem 0 0; padding: 0; position: relative; }
.stepper::before {
  content: ""; position: absolute; left: 1.05rem; top: .5rem; bottom: .5rem;
  width: 2px; background: var(--border);
}
.step { position: relative; display: flex; gap: 1.15rem; padding: 0 0 1.9rem; }
.node {
  position: relative; z-index: 1; flex: none; width: 2.15rem; height: 2.15rem;
  border-radius: 50%; display: grid; place-items: center;
  background: var(--bg); border: 2px solid var(--accent-dim); color: var(--accent);
  font-size: .85rem;
}
.node.done { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.step-body { flex: 1; min-width: 0; padding-top: .1rem; }
.step-top { display: flex; align-items: baseline; gap: .7rem; flex-wrap: wrap; }
.step-title { font-weight: 600; font-size: 1.06rem; color: var(--text); }
.step-title:hover { color: var(--accent); text-decoration: none; }
.step-note { margin: .45rem 0 .3rem; color: var(--muted); font-size: .93rem; max-width: 44rem; }
.watched-box { color: var(--muted); margin-left: auto; display: inline-flex; align-items: center; gap: .35rem; cursor: pointer; white-space: nowrap; }
.watched-box input { accent-color: var(--accent); cursor: pointer; }

/* badges & chips */
.badge {
  font-family: var(--mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .05em;
  padding: .12em .5em; border-radius: 99px; border: 1px solid;
}
.badge-beginner { color: #4cc38a; border-color: #4cc38a55; }
.badge-intermediate { color: #d9a842; border-color: #d9a84255; }
.badge-advanced { color: #e5604f; border-color: #e5604f55; }
.chip-row { display: flex; flex-wrap: wrap; gap: .45rem; }
.chip {
  font-size: .84rem; padding: .25em .7em; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
}
.chip:hover { border-color: var(--accent); text-decoration: none; }
.chip-row.small { margin: .3rem 0 .45rem; }
.chip-row.small .chip { font-size: .74rem; padding: .2em .6em; color: var(--muted); background: transparent; }
.chip-row.small .chip:hover { color: var(--text); }

/* video page */
.video-page h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); margin: .2rem 0 .2rem; }
.video-meta { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin: .7rem 0 1.3rem; color: var(--muted); }
.player-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(16rem, 3fr); gap: 1rem; align-items: stretch; }
.player-frame { position: relative; align-self: start; aspect-ratio: 16 / 9; background: #000; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
.player-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.chapter-pane {
  position: relative; overflow: hidden; min-height: 0;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
}
.chapter-pane-inner {
  position: absolute; inset: 0; padding: .9rem; display: flex; flex-direction: column;
}
.pane-title { margin: 0 0 .5rem; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.chapters { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; min-height: 0; }
.chapters li { display: flex; align-items: center; gap: .3rem; }
.chapter {
  flex: 1; display: flex; gap: .7rem; align-items: baseline; text-align: left;
  background: none; border: 0; color: var(--text); padding: .42rem .5rem; border-radius: 6px;
  cursor: pointer; font: inherit; font-size: .9rem; line-height: 1.4;
}
.chapter:hover, .chapter.active { background: var(--accent-bg); }
.chapter .tc { color: var(--accent); flex: none; }
.yt-jump { color: var(--muted); padding: .2rem .4rem; border-radius: 5px; }
.yt-jump:hover { color: var(--accent); text-decoration: none; }
.video-about p, .video-takeaways li { max-width: 50rem; }
.video-takeaways li { margin: .5rem 0; }
.path-slot { border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 8px; padding: .8rem 1rem; margin: .7rem 0; background: var(--surface); }
.path-name a { color: var(--text); }
.pn-row { display: flex; justify-content: space-between; gap: 1rem; margin-top: .45rem; flex-wrap: wrap; }
.pn { font-size: .92rem; }
.pn.dim { color: var(--muted); }

/* search */
.search { position: relative; }
#search-input {
  width: 11rem; padding: .35rem .8rem; border-radius: 99px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font: inherit; font-size: .88rem;
}
#search-input::placeholder { color: var(--muted); }
#search-input:focus { outline: none; border-color: var(--accent); }
#search-results {
  position: absolute; top: calc(100% + .45rem); right: 0; z-index: 30;
  width: min(26rem, calc(100vw - 2.5rem)); max-height: 24rem; overflow-y: auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 10px 34px rgb(0 0 0 / .35);
}
.sr-item { display: block; padding: .55rem .85rem; border-bottom: 1px solid var(--border); color: var(--text); }
.sr-item:last-child { border-bottom: 0; }
.sr-item:hover, .sr-item.sel { background: var(--accent-bg); text-decoration: none; }
.sr-kind { color: var(--accent); font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; margin-right: .55em; }
.sr-title { font-weight: 550; }
.sr-snippet { display: block; color: var(--muted); font-size: .8rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sr-empty { padding: .7rem .9rem; color: var(--muted); font-size: .88rem; }

/* videos catalog */
.catalog-page h1, .tags-page h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
.filter-bar { display: flex; flex-direction: column; gap: .55rem; margin: 1.5rem 0 1.1rem; }
.filter-group { display: flex; flex-wrap: wrap; gap: .4rem; }
.fbtn {
  font-family: var(--mono); font-size: .78rem; cursor: pointer;
  padding: .28em .85em; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--border); color: var(--muted);
}
.fbtn:hover { color: var(--text); border-color: var(--muted); }
.fbtn.on { color: var(--text); border-color: var(--accent); background: var(--accent-bg); }
.cat-list { list-style: none; padding: 0; margin: 0; }
.cat-card { padding: .95rem 0; border-bottom: 1px solid var(--border); }
.cat-top { display: flex; align-items: baseline; gap: .7rem; flex-wrap: wrap; }
.cat-card .step-note { margin: .35rem 0 .45rem; }
.cat-foot { display: flex; flex-wrap: wrap; gap: .3rem .45rem; align-items: center; }
.chip.track-chip { font-size: .74rem; color: var(--accent); border-color: var(--accent-dim); background: var(--accent-bg); }

/* tags */
.chip.tag { font-family: var(--mono); font-size: .74rem; color: var(--muted); background: transparent; }
.chip.tag:hover { color: var(--text); }
.tag-row { margin-top: .5rem; }
.tag-n { color: var(--muted); font-size: .9em; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: .45rem; margin: 1.4rem 0 1.6rem; }
.tag-section { padding: .95rem 0; border-bottom: 1px solid var(--border); }
.tag-section h2 { margin: 0 0 .55rem; font-size: 1rem; }
.tag-group { display: flex; gap: .9rem; align-items: baseline; margin: .4rem 0; }
.tag-group > .meta { flex: none; width: 6.5rem; }

/* block markdown (overview) */
.table-scroll { overflow-x: auto; margin: 1.1rem 0; }
.topic-body table { border-collapse: collapse; font-size: .93rem; min-width: 34rem; }
.topic-body th, .topic-body td { border: 1px solid var(--border); padding: .5em .8em; text-align: left; vertical-align: top; }
.topic-body th { background: var(--surface); }
.topic-body blockquote { margin: 1rem 0; padding: .3rem 1.1rem; border-left: 3px solid var(--accent-dim); color: var(--muted); }
.overview-page .topic-body ul { padding-left: 1.2rem; }
.overview-page .topic-body li { margin: .4rem 0; }

/* topic / library / books */
.topic-page h1, .library-page h1, .books-page h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
.topic-body { max-width: 50rem; }
.covered-list { list-style: none; padding: 0; max-width: 50rem; }
.covered-list li { padding: .7rem 0; border-bottom: 1px solid var(--border); }
.covered-list .step-note { margin: .25rem 0 0; }
.library { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: .4rem 1.6rem; }
.library li { padding: .55rem 0; border-bottom: 1px solid var(--border); }
.library .step-note { margin: .15rem 0 0; font-size: .86rem; }
.book { max-width: 50rem; padding: 1.1rem 0; border-bottom: 1px solid var(--border); }
.book h2 { margin: 0; font-size: 1.25rem; }

@media (max-width: 860px) {
  .player-grid { grid-template-columns: 1fr; }
  .chapter-pane { overflow: visible; }
  .chapter-pane-inner { position: static; }
  .chapters { max-height: 300px; }
  .site-head { flex-wrap: wrap; gap: .6rem 1rem; }
  .site-head nav { margin-left: 0; }
  .watched-box { margin-left: 0; }
  .search { flex: 1 1 12rem; }
  #search-input { width: 100%; }
  .tag-group { flex-direction: column; gap: .25rem; }
  .tag-group > .meta { width: auto; }
}