/* Learning AI My Way — shared styles */
:root {
  --bg: #f4f5f8;
  --surface: #ffffff;
  --surface-2: #eceef3;
  --text: #151b2b;
  --dim: #596175;
  --hair: rgba(21, 27, 43, .12);
  --amber: #a8620a;
  --amber-soft: rgba(168, 98, 10, .1);
  --rose: #bd3650;
  --star: #2b679b;
  --lilac: #5f4bcf;
  --code-bg: #10172a;
  --code-text: #e6e1d6;
  --serif: "Cormorant Garamond", "Iowan Old Style", Georgia, serif;
  --sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --measure: 70ch;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1120;
    --surface: #111a2e;
    --surface-2: #17213a;
    --text: #eee6d6;
    --dim: #8f96aa;
    --hair: rgba(238, 230, 214, .13);
    --amber: #f4b860;
    --amber-soft: rgba(244, 184, 96, .1);
    --rose: #ef8193;
    --star: #a9d6f5;
    --lilac: #c4b3ff;
    --code-bg: #070b16;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b1120;
  --surface: #111a2e;
  --surface-2: #17213a;
  --text: #eee6d6;
  --dim: #8f96aa;
  --hair: rgba(238, 230, 214, .13);
  --amber: #f4b860;
  --amber-soft: rgba(244, 184, 96, .1);
  --rose: #ef8193;
  --star: #a9d6f5;
  --lilac: #c4b3ff;
  --code-bg: #070b16;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16.5px/1.65 var(--sans);
}
img, iframe, video { max-width: 100%; }
a { color: var(--star); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--amber); }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 3px; }

.wrap { max-width: 1120px; margin: 0 auto; padding-inline: clamp(16px, 4vw, 40px); }

/* ── top bar ── */
.topbar { border-bottom: 1px solid var(--hair); background: var(--bg); position: sticky; top: 0; z-index: 10; }
.topbar .wrap { display: flex; align-items: center; gap: 20px; min-height: 58px; }
.brand { font: italic 600 23px/1 var(--serif); color: var(--text); text-decoration: none; margin-right: auto; }
.brand span { color: var(--amber); }
.topnav { display: flex; gap: 18px; font-size: 14px; }
.topnav a { color: var(--dim); text-decoration: none; }
.topnav a:hover, .topnav a[aria-current="page"] { color: var(--text); }
.theme-btn {
  font: 500 13px/1 var(--sans); color: var(--dim); background: none;
  border: 1px solid var(--hair); border-radius: 999px; padding: 7px 12px; cursor: pointer;
}
.theme-btn:hover { color: var(--text); }
@media (max-width: 560px) { .topnav { display: none; } }

/* ── type ── */
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.12; text-wrap: balance; letter-spacing: -.005em; }
h1 { font-size: clamp(40px, 6vw, 68px); font-style: italic; font-weight: 500; margin: 0; }
h2 { font-size: clamp(28px, 3.2vw, 36px); margin: 2.2em 0 .5em; }
h3 { font-size: 23px; margin: 1.8em 0 .4em; }
.eyebrow { font: 600 11px/1.2 var(--sans); letter-spacing: .24em; text-transform: uppercase; color: var(--dim); }
.lede { font-size: 19px; color: var(--dim); max-width: 58ch; }

/* ── home ── */
.hero { padding-block: clamp(40px, 8vw, 88px) clamp(28px, 5vw, 48px); display: grid; gap: 18px; }
.hero h1 span { color: var(--amber); }
.hero-film {
  display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(20px, 3vw, 40px);
  align-items: center; padding: 18px; background: var(--code-bg); border-radius: 14px; color: #eee6d6;
  text-decoration: none; margin-bottom: 56px;
}
.hero-film:hover { color: #eee6d6; }
.hero-film .poster { position: relative; aspect-ratio: 16 / 9; border-radius: 8px; overflow: hidden; background: #0b1120; }
.hero-film .poster canvas { width: 100%; height: 100%; display: block; }
.hero-film .poster::after {
  content: "▶  Watch"; position: absolute; left: 16px; bottom: 14px;
  font: 600 13px/1 var(--sans); letter-spacing: .06em; padding: 9px 14px; border-radius: 999px;
  background: rgba(244, 184, 96, .92); color: #1a1206;
}
.hero-film .eyebrow { color: #f4b860; }
.hero-film h2 { margin: .3em 0 .3em; font-style: italic; font-weight: 500; font-size: clamp(28px, 3.4vw, 40px); }
.hero-film p { color: #aab0c2; margin: 0; }
@media (max-width: 760px) { .hero-film { grid-template-columns: minmax(0, 1fr); } }

.path { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.stop {
  display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; gap: 18px; align-items: start;
  padding: 26px 0; border-top: 1px solid var(--hair); position: relative;
}
.stop:last-child { border-bottom: 1px solid var(--hair); }
.stop .n { font: italic 500 44px/1 var(--serif); color: var(--dim); font-variant-numeric: tabular-nums; }
.stop.done .n { color: var(--amber); }
.stop h3 { margin: 0 0 6px; font-size: 27px; }
.stop h3 a { color: var(--text); text-decoration: none; }
.stop h3 a::after { content: ""; position: absolute; inset: 0; }
.stop:hover h3 a { color: var(--amber); }
.stop p { margin: 0; color: var(--dim); max-width: 62ch; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.chip {
  font: 500 12px/1 var(--sans); padding: 6px 9px; border-radius: 999px;
  border: 1px solid var(--hair); color: var(--dim); white-space: nowrap;
}
.chip.film { color: var(--amber); border-color: color-mix(in srgb, var(--amber) 45%, transparent); }
.chip.math { color: var(--lilac); border-color: color-mix(in srgb, var(--lilac) 40%, transparent); }
.chip.code { color: var(--star); border-color: color-mix(in srgb, var(--star) 40%, transparent); }
.chip.video { color: var(--rose); border-color: color-mix(in srgb, var(--rose) 40%, transparent); }
.stop .meta { font: 13px/1.4 var(--mono); color: var(--dim); text-align: right; white-space: nowrap; }
.stop.done .meta::before { content: "✓ done  "; color: var(--amber); }
@media (max-width: 640px) {
  .stop { grid-template-columns: 44px minmax(0, 1fr); }
  .stop .n { font-size: 34px; }
  .stop .meta { grid-column: 2; text-align: left; }
}
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin: 0 0 8px; }
.section-head h2 { margin: 0; }
.progress-note { font: 13px/1 var(--mono); color: var(--dim); }

.pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 3vw, 36px); margin-block: 64px 24px; }
.pillars h3 { margin: 0 0 6px; font-size: 22px; }
.pillars p { margin: 0; color: var(--dim); font-size: 15.5px; }
@media (max-width: 760px) { .pillars { grid-template-columns: minmax(0, 1fr); } }

footer { border-top: 1px solid var(--hair); margin-top: 72px; padding-block: 28px 40px; color: var(--dim); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }

/* ── lesson ── */
.lesson-head { padding-block: clamp(28px, 6vw, 64px) 20px; display: grid; gap: 14px; }
.crumbs { font-size: 14px; color: var(--dim); }
.crumbs a { color: var(--dim); }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; font: 13px/1.4 var(--mono); color: var(--dim); }

.film-frame {
  position: relative; width: 100%; height: min(82vh, 680px); min-height: 540px;
  border-radius: 12px; overflow: hidden; background: #05070d; border: 1px solid var(--hair);
}
.film-frame iframe { width: 100%; height: 100%; border: 0; display: block; }
.film-caption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 16px; font-size: 14px; color: var(--dim); margin-top: 10px; }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 56px; align-items: start; }
.toc { position: sticky; top: 84px; font-size: 14px; padding-top: 2.4em; }
.toc ol { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 8px; }
.toc a { color: var(--dim); text-decoration: none; }
.toc a:hover { color: var(--text); }
@media (max-width: 960px) { .layout { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }

.prose { max-width: var(--measure); }
.prose p, .prose li { font-size: 17px; }
.prose li + li { margin-top: .35em; }
.prose blockquote {
  margin: 1.6em 0; padding: 14px 18px; background: var(--amber-soft); border-radius: 10px; color: var(--text);
}
.prose blockquote p { margin: .3em 0; }
.prose blockquote strong:first-child { color: var(--amber); }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.prose .table-scroll { overflow-x: auto; margin: 1.4em 0; }
.prose th, .prose td { padding: 8px 12px; border-bottom: 1px solid var(--hair); text-align: left; vertical-align: top; }
.prose th { font-weight: 600; }
.prose hr { border: 0; border-top: 1px solid var(--hair); margin: 2.4em 0; }
.prose .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; margin: 1.2em 0; }
.prose .katex { font-size: 1.08em; }
.prose code { font: .88em/1.5 var(--mono); background: var(--surface-2); padding: .12em .35em; border-radius: 4px; }
.prose pre code { background: none; padding: 0; font-size: 14px; }

pre {
  position: relative; background: var(--code-bg); color: var(--code-text); border-radius: 10px;
  padding: 16px 18px; overflow-x: auto; font: 14px/1.6 var(--mono); margin: 1.4em 0;
}
pre .copy {
  position: absolute; top: 8px; right: 8px; font: 500 12px/1 var(--sans); color: #aab0c2;
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12); border-radius: 6px;
  padding: 6px 9px; cursor: pointer;
}
pre .copy:hover { color: #fff; }
.hljs-keyword, .hljs-built_in { color: #c4b3ff; }
.hljs-string { color: #9fe0bd; }
.hljs-number, .hljs-literal { color: #f4b860; }
.hljs-comment { color: #7d849a; font-style: italic; }
.hljs-title, .hljs-title.function_ { color: #a9d6f5; }
.hljs-params { color: #e6e1d6; }
.hljs-meta { color: #ef8193; }

.videos { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; margin-top: 12px; }
.video { display: grid; gap: 8px; }
.video .yt {
  position: relative; aspect-ratio: 16 / 9; border-radius: 10px; overflow: hidden; background: #000;
  border: 0; padding: 0; cursor: pointer; width: 100%;
}
.video .yt img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: .88; }
.video .yt:hover img { opacity: 1; }
.video .yt span {
  position: absolute; left: 12px; bottom: 12px; font: 600 12px/1 var(--sans); padding: 8px 12px;
  border-radius: 999px; background: rgba(0, 0, 0, .7); color: #fff;
}
.video iframe { width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 10px; display: block; }
.video h4 { margin: 0; font: 600 15.5px/1.35 var(--sans); }
.video p { margin: 0; font-size: 14px; color: var(--dim); }

.code-files { display: grid; gap: 14px; margin-top: 12px; }
details.code-file { border: 1px solid var(--hair); border-radius: 10px; background: var(--surface); }
details.code-file summary {
  cursor: pointer; padding: 14px 16px; display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap;
  list-style: none;
}
details.code-file summary::-webkit-details-marker { display: none; }
details.code-file summary::before { content: "▸"; color: var(--dim); }
details.code-file[open] summary::before { content: "▾"; }
details.code-file summary code { font: 500 14px/1.4 var(--mono); }
details.code-file summary span { color: var(--dim); font-size: 14px; }
details.code-file pre { margin: 0 12px 12px; }
.run-hint { font: 13px/1.5 var(--mono); color: var(--dim); margin: 0 16px 12px; }

.done-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 48px; padding: 18px 0; border-top: 1px solid var(--hair); }
.btn {
  font: 600 14px/1 var(--sans); padding: 11px 16px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--hair); background: var(--surface); color: var(--text); text-decoration: none;
}
.btn:hover { border-color: var(--amber); color: var(--text); }
.btn[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); color: var(--bg); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.pager a { display: grid; gap: 4px; padding: 16px; border: 1px solid var(--hair); border-radius: 10px; text-decoration: none; color: var(--text); }
.pager a:hover { border-color: var(--amber); }
.pager a span { font-size: 13px; color: var(--dim); }
.pager a strong { font: italic 600 21px/1.2 var(--serif); }
.pager .next { text-align: right; grid-column: 2; }
@media (max-width: 560px) { .pager { grid-template-columns: minmax(0, 1fr); } .pager .next { grid-column: 1; } }

.loading, .error { color: var(--dim); padding-block: 40px; }

/* ── films index ── */
.film-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; margin-top: 24px; }
.film-card { display: grid; gap: 10px; text-decoration: none; color: var(--text); }
.film-card .poster { aspect-ratio: 16 / 9; border-radius: 10px; background: radial-gradient(circle at 60% 45%, rgba(244,184,96,.28), transparent 60%), #0b1120; display: grid; place-items: center; color: #eee6d6; font: italic 500 26px/1.1 var(--serif); padding: 16px; text-align: center; }
.film-card:hover .poster { outline: 2px solid var(--amber); }
.film-card p { margin: 0; color: var(--dim); font-size: 15px; }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

[hidden] { display: none !important; }

/* ── lesson end + coding lab ── */
.lesson-end { max-width: var(--measure); }
.lab { margin-top: 72px; }
.lab-head { max-width: var(--measure); margin-bottom: 20px; }
.lab-head h2 { margin: .25em 0 .35em; }
.lab-head p { color: var(--dim); font-size: 17px; margin: 0; }

.ide {
  --ide-bg: #0d1322; --ide-panel: #111a2e; --ide-line: rgba(238, 230, 214, .1);
  --ide-text: #e6e1d6; --ide-dim: #8f96aa; --ide-amber: #f4b860; --ide-green: #8fdcae; --ide-red: #ef8193;
  background: var(--ide-bg); color: var(--ide-text); border-radius: 12px; overflow: hidden;
  border: 1px solid rgba(238, 230, 214, .12); box-shadow: 0 20px 60px -30px rgba(0, 0, 0, .6);
}
.ide-top {
  display: flex; align-items: center; gap: 14px; padding: 10px 16px; background: #080d19;
  border-bottom: 1px solid var(--ide-line); font: 12.5px/1.2 var(--mono); flex-wrap: wrap;
}
.ide-dots { display: flex; gap: 6px; }
.ide-dots i { width: 10px; height: 10px; border-radius: 50%; background: #2a3350; }
.ide-file { color: var(--ide-text); }
.ide-count { color: var(--ide-amber); }
.ide-status { margin-left: auto; color: var(--ide-dim); }
.ide-status::before { content: "●"; margin-right: 6px; color: #56607a; }
.ide-status[data-state="loading"]::before, .ide-status[data-state="installing"]::before { color: var(--ide-amber); }
.ide-status[data-state="ready"]::before { color: var(--ide-green); }
.ide-status[data-state="error"]::before { color: var(--ide-red); }

.ide-body { display: grid; grid-template-columns: 230px minmax(0, 1fr); min-height: 560px; }
.ide-steps { list-style: none; margin: 0; padding: 10px 8px; background: var(--ide-panel); border-right: 1px solid var(--ide-line); display: grid; align-content: start; gap: 2px; }
.ide-steps button {
  width: 100%; display: grid; grid-template-columns: 26px 1fr; gap: 8px; align-items: center; text-align: left;
  background: none; border: 0; border-radius: 7px; padding: 8px 8px; color: var(--ide-dim); font: 13.5px/1.3 var(--sans); cursor: pointer;
}
.ide-steps button:hover:not(:disabled) { background: rgba(238, 230, 214, .05); color: var(--ide-text); }
.ide-steps button .n {
  width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; font: 500 11.5px/1 var(--mono);
  border: 1px solid rgba(238, 230, 214, .2);
}
.ide-steps button.passed .n { background: rgba(143, 220, 174, .15); border-color: rgba(143, 220, 174, .5); color: var(--ide-green); }
.ide-steps button.open { color: var(--ide-text); }
.ide-steps button.current { background: rgba(244, 184, 96, .1); color: var(--ide-text); }
.ide-steps button.current .n { border-color: var(--ide-amber); color: var(--ide-amber); }
.ide-steps button:disabled { opacity: .45; cursor: default; }

.ide-main { display: flex; flex-direction: column; min-width: 0; }
.ide-brief { padding: 18px 22px 12px; border-bottom: 1px solid var(--ide-line); font-size: 15.5px; line-height: 1.6; }
.ide-brief h3 { font-family: var(--serif); font-size: 26px; margin: .1em 0 .3em; color: var(--ide-text); }
.ide-brief p { margin: .4em 0; max-width: 68ch; }
.ide-brief code, .ide-help code { font: .9em var(--mono); background: rgba(238, 230, 214, .08); padding: .1em .35em; border-radius: 4px; }
.ide-brief .katex-display { margin: .6em 0; overflow-x: auto; overflow-y: hidden; }
.ide-step { font: 600 10.5px/1 var(--sans); letter-spacing: .22em; text-transform: uppercase; color: var(--ide-amber); }

.ide-prev { border-bottom: 1px dashed var(--ide-line); }
.ide-prev-label { font: 11.5px/1 var(--mono); color: var(--ide-dim); padding: 8px 12px 4px; }
.ide-prev .CodeMirror { height: auto; max-height: 190px; opacity: .62; background: transparent; }
.ide-prev .CodeMirror-scroll { max-height: 190px; }
.ide-editor { min-height: 170px; }
.ide-editor .CodeMirror { height: auto; min-height: 170px; }
.ide-editor .CodeMirror-scroll { min-height: 170px; }
.ide-loading { padding: 16px 22px; color: var(--ide-dim); margin: 0; }

.ide .CodeMirror { font: 14px/1.6 var(--mono); background: var(--ide-bg); color: var(--ide-text); }
.ide .CodeMirror-gutters { background: var(--ide-bg); border-right: 1px solid var(--ide-line); }
.ide .CodeMirror-linenumber { color: #4f5872; padding: 0 10px 0 6px; }
.ide .CodeMirror-cursor { border-left: 2px solid var(--ide-amber); }
.ide .CodeMirror-selected, .ide .CodeMirror-focused .CodeMirror-selected { background: rgba(196, 179, 255, .18); }
.ide .CodeMirror-matchingbracket { color: var(--ide-amber) !important; text-decoration: underline; }
.ide .cm-s-default .cm-keyword { color: #c4b3ff; }
.ide .cm-s-default .cm-def { color: #a9d6f5; }
.ide .cm-s-default .cm-builtin { color: #c4b3ff; }
.ide .cm-s-default .cm-string { color: #9fe0bd; }
.ide .cm-s-default .cm-number { color: #f4b860; }
.ide .cm-s-default .cm-comment { color: #7d849a; font-style: italic; }
.ide .cm-s-default .cm-variable-2 { color: #e6e1d6; }
.ide .cm-s-default .cm-operator { color: #e6e1d6; }
.ide .cm-s-default .cm-variable, .ide .cm-s-default .cm-property { color: #e6e1d6; }

.ide-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-top: 1px solid var(--ide-line); background: var(--ide-panel); flex-wrap: wrap; }
.ide-run {
  font: 600 13.5px/1 var(--sans); padding: 9px 16px; border-radius: 8px; cursor: pointer;
  background: var(--ide-amber); color: #1a1206; border: 0;
}
.ide-run:disabled { opacity: .6; cursor: wait; }
.ide-kbd { font: 11.5px var(--mono); color: var(--ide-dim); }
.ide-spacer { flex: 1; }
.ide-ghost {
  font: 500 13px/1 var(--sans); padding: 8px 12px; border-radius: 8px; cursor: pointer;
  background: none; color: var(--ide-text); border: 1px solid rgba(238, 230, 214, .18);
}
.ide-ghost:hover { border-color: rgba(238, 230, 214, .4); }
.ide-help { padding: 12px 18px; background: rgba(244, 184, 96, .07); border-top: 1px solid var(--ide-line); font-size: 14.5px; }
.ide-help pre { margin: 10px 0; background: #070b16; }
.ide-console { padding: 14px 18px 18px; border-top: 1px solid var(--ide-line); font: 13.5px/1.55 var(--mono); min-height: 96px; background: #080d19; display: grid; gap: 4px; align-content: start; }
.ide-console .ok { color: var(--ide-green); }
.ide-console .bad { color: var(--ide-red); }
.ide-console .bad span { display: block; color: var(--ide-dim); padding-left: 1.4em; }
.ide-console .muted { color: var(--ide-dim); }
.ide-console .win { color: var(--ide-amber); font-weight: 500; margin-top: 6px; }
.ide-console pre.out { margin: 0 0 6px; padding: 10px 12px; background: rgba(238, 230, 214, .05); border-radius: 6px; font-size: 13px; }
.ide-next {
  justify-self: start; margin-top: 8px; font: 600 13.5px/1 var(--sans); padding: 10px 14px; border-radius: 8px; cursor: pointer;
  background: rgba(143, 220, 174, .15); color: var(--ide-green); border: 1px solid rgba(143, 220, 174, .45);
}

.lab-done { margin-top: 24px; padding: 22px; border-radius: 12px; border: 1px solid color-mix(in srgb, var(--amber) 50%, transparent); background: var(--amber-soft); }
.lab-done-head { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: flex-start; }
.lab-done h3 { margin: .2em 0 .3em; }
.lab-done p { margin: 0; color: var(--dim); max-width: 60ch; }
.lab-done-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.lab-done pre { max-height: 420px; }

@media (max-width: 860px) {
  .ide-body { grid-template-columns: minmax(0, 1fr); }
  .ide-steps { display: flex; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--ide-line); padding: 8px; gap: 4px; }
  .ide-steps li { flex: none; }
  .ide-steps button { grid-template-columns: 24px auto; white-space: nowrap; }
  .ide-steps button:not(.current) .t { display: none; }
  .ide-kbd { display: none; }
}
.ide-brief .ide-note { font-size: 13.5px; color: var(--ide-dim); border-left: 2px solid var(--ide-amber); padding-left: 10px; }
.film-list { align-items: start; }
.film-item { display: grid; gap: 8px; }
.film-dl { margin: 0; font-size: 14px; }
.film-links { white-space: nowrap; }

/* ── questions and feedback (giscus) ── */
.discuss { max-width: var(--measure); margin-top: 56px; padding-top: 8px; border-top: 1px solid var(--hair); }
.discuss h2 { margin-top: 1em; }
.discuss p { color: var(--dim); }
#giscus { margin-top: 20px; min-height: 120px; }

/* ── tracks on the home page ── */
.tracks-title { margin: 0 0 16px; }
.tracks { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.track-card {
  display: grid; gap: 8px; text-align: left; padding: 20px 22px; border-radius: 14px; cursor: pointer;
  background: var(--surface); color: var(--text); border: 1px solid var(--hair); font: inherit;
}
.track-card:hover { border-color: color-mix(in srgb, var(--amber) 60%, transparent); }
.track-card[aria-selected="true"] { border-color: var(--amber); box-shadow: inset 0 0 0 1px var(--amber); background: var(--amber-soft); }
.track-card strong { font: italic 600 clamp(24px, 2.6vw, 30px)/1.1 var(--serif); }
.track-card .tagline { color: var(--dim); font-size: 15px; }
.track-card .bar { display: block; height: 4px; border-radius: 4px; background: var(--hair); overflow: hidden; margin-top: 6px; }
.track-card .bar i { display: block; height: 100%; background: var(--amber); }
.track-card .count { font: 12.5px/1.3 var(--mono); color: var(--dim); }
@media (max-width: 680px) { .tracks { grid-template-columns: minmax(0, 1fr); } }
.track-summary { color: var(--dim); font-size: 17px; max-width: 70ch; margin: 28px 0 0; }
.part { margin-top: 48px; }
.part .section-head { align-items: end; margin-bottom: 14px; }
.part .section-head h2 { margin: .2em 0 0; }
.part-sum { margin: 6px 0 0; color: var(--dim); }

.stop.soon .n, .stop.soon h3 { color: var(--dim); }
.stop.soon h3 { font-weight: 500; }
.stop.soon p { opacity: .8; }
.stop.project { background: linear-gradient(90deg, var(--amber-soft), transparent 70%); padding-inline: 14px; margin-inline: -14px; border-radius: 10px; }
.stop .proj-mark { color: var(--amber); font-style: normal; font-size: 30px; }
.stop.project.soon .proj-mark { color: var(--dim); }
.chip.ex { color: var(--rose); border-color: color-mix(in srgb, var(--rose) 40%, transparent); }
.soon-note { max-width: var(--measure); padding: 18px 20px; border-radius: 12px; background: var(--amber-soft); color: var(--text); margin-top: 12px; }

/* ── films grouped by track ── */
.film-track { margin-top: 40px; }
.film-track h2 { margin: .2em 0 0; }
.film-card h3 { margin: .2em 0; }
.film-empty { color: var(--dim); }

/* ── lab: exercises, project tabs, model settings ── */
.anchor { display: block; position: relative; top: -80px; visibility: hidden; }
.ide-steps .ide-group { font: 600 10.5px/1 var(--sans); letter-spacing: .2em; text-transform: uppercase; color: var(--ide-dim); padding: 16px 8px 6px; border-top: 1px solid var(--ide-line); margin-top: 8px; }
.ide-steps button .t em { font-style: normal; font-size: 11px; color: var(--ide-dim); margin-left: 4px; }
.ide-step.ex { color: #ef8193; }
.ide-tabs { display: flex; gap: 2px; padding: 6px 8px 0; background: #080d19; border-bottom: 1px solid var(--ide-line); overflow-x: auto; }
.ide-tabs button {
  font: 12.5px/1 var(--mono); padding: 9px 12px; border: 1px solid transparent; border-bottom: 0; border-radius: 7px 7px 0 0;
  background: none; color: var(--ide-dim); cursor: pointer; white-space: nowrap;
}
.ide-tabs button[aria-selected="true"] { background: var(--ide-bg); color: var(--ide-text); border-color: var(--ide-line); }
.ide-tabs button i { font-style: normal; color: var(--ide-amber); font-size: 9px; margin-left: 4px; vertical-align: 2px; }
.ide-model {
  font: 500 12px/1 var(--mono); padding: 6px 10px; border-radius: 999px; cursor: pointer;
  background: none; color: var(--ide-text); border: 1px solid rgba(238, 230, 214, .2);
}
.ide-model[data-real="1"] { border-color: var(--ide-green); color: var(--ide-green); }
.ide-keys { padding: 14px 18px; background: #0a1020; border-bottom: 1px solid var(--ide-line); font-size: 14.5px; display: grid; gap: 8px; }
.ide-keys p { margin: 0; max-width: 80ch; }
.ide-keys .warn { color: var(--ide-dim); font-size: 13.5px; border-left: 2px solid var(--ide-red); padding-left: 10px; }
.ide-keyrow { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.ide-keyrow input { font: 13px var(--mono); padding: 8px 10px; border-radius: 8px; border: 1px solid rgba(238, 230, 214, .2); background: var(--ide-bg); color: var(--ide-text); min-width: min(320px, 100%); }
.ide-keyrow a { color: #a9d6f5; font-size: 13.5px; }
.ide-keyset { font: 13px var(--mono); color: var(--ide-green); }
.ide-help p { margin: .3em 0; }
.ide-help .muted { color: var(--ide-dim); font-size: 13.5px; }
.ide-solfile { font: 12px var(--mono); color: var(--ide-amber); margin-top: 8px; }
.lab-files { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.lab-files code { font: 13px var(--mono); background: var(--surface); padding: 4px 8px; border-radius: 6px; border: 1px solid var(--hair); }