/* Академия Игор · «Игра с нейросетями» — платформа уроков.
   Один стиль с главной академии (черновик j-hub, academy/DESIGN.md): тёмный графит, Geist, белые кнопки,
   карточки с тонкой рамкой, моно-метки с цветным квадратиком. Цвет — маленькими дозами: точка, линия, мягкая подложка.
   Роли цветов: --amber решает человек, --sage делает агент («зелёный»), --red ошибка, --blue справка, --teal свечение игры.
   Миры курса: 1 --amber, 2 --red, 3 --teal, 4 --blue (движок ставит <html data-world="N"> на странице дня → --world).
   Экран выбора жанра и тосты — в dialog.css (самодостаточный файл, его подключают и уроки, и главная). */
:root {
  --bg: #111214;
  --band: #141518;
  --bg2: #17181c;
  --bg3: #1c1d22;
  --bg4: #24252b;
  --line: rgba(255, 255, 255, .08);
  --line2: rgba(255, 255, 255, .16);
  --ink: #f2f1ee;
  --ink2: #c9c8cc;
  --mute: #8f8e95;
  --amber: #ffb23f;
  --amber-2: #ffc66b;
  --on-amber: #1a1206;
  --amber-soft: rgba(255, 178, 63, .12);
  --sage: #3ddc84;
  --sage-soft: rgba(61, 220, 132, .12);
  --red: #ff6b57;
  --red-soft: rgba(255, 107, 87, .12);
  --blue: #5b9dff;
  --blue-soft: rgba(91, 157, 255, .12);
  --teal: #2ec4b6;
  --teal-soft: rgba(46, 196, 182, .12);
  --code: #0c0d0f;
  --code-ink: #e9e8e4;
  --code-mute: #8f8e95;
  --shadow: 0 18px 50px rgba(0, 0, 0, .35);
  --sans: "Geist", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --display: var(--sans);
  --read: 760px;
  --wide: 1040px;
  --head: 64px;
  --r: 20px;
  --r-sm: 14px;
  --world: var(--amber);
  color-scheme: dark;
}
:root[data-world="2"] { --world: var(--red); }
:root[data-world="3"] { --world: var(--teal); }
:root[data-world="4"] { --world: var(--blue); }

/* ================= База ================= */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--head) + 24px); -webkit-text-size-adjust: 100%; overflow-x: clip; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.7 var(--sans); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, svg, video, canvas { max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--amber) 55%, transparent); transition: color .2s, text-decoration-color .2s; }
a:hover { color: var(--ink); text-decoration-color: var(--amber); }
::selection { background: rgba(255, 178, 63, .32); color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
* { scrollbar-width: thin; scrollbar-color: var(--line2) transparent; }

/* ================= Типографика ================= */
h1, h2, h3, h4 { font-family: var(--sans); color: var(--ink); text-wrap: balance; }
h1 { margin: 14px 0 18px; font-size: clamp(36px, 4.6vw, 56px); font-weight: 800; line-height: 1.02; letter-spacing: -.045em; }
h2 { margin: 0 0 18px; font-size: clamp(27px, 3vw, 36px); font-weight: 700; line-height: 1.08; letter-spacing: -.035em; }
h3 { margin: 36px 0 12px; font-size: 22px; font-weight: 700; line-height: 1.2; letter-spacing: -.025em; }
h4 { margin: 24px 0 8px; font-size: 18px; font-weight: 600; line-height: 1.3; letter-spacing: -.015em; }
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 16px; padding-left: 24px; }
li { margin: 5px 0; }
li::marker { color: var(--mute); }
ol > li::marker { font: 500 .88em var(--mono); }
strong, b { color: var(--ink); font-weight: 600; }
em { font-style: normal; color: var(--amber); }
em.sage { color: var(--sage); }
.lead { font-size: 19px; line-height: 1.6; color: var(--ink2); }
.muted { color: var(--mute); }
.small { font-size: 15px; }
.mono { font-family: var(--mono); }
code { padding: 2px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg3); color: var(--ink); font: 400 .86em var(--mono); }
kbd { display: inline-block; min-width: 1.9em; padding: 3px 7px 4px; border: 1px solid var(--line2); border-bottom-width: 2px; border-radius: 7px; background: var(--bg3); color: var(--ink); font: 500 13px/1 var(--mono); text-align: center; }
hr, .dash { margin: 36px 0; border: 0; border-top: 1px solid var(--line); }

/* Моно-метка с цветным квадратиком: <span class="kicker">день 5 · мастерская</span>. Цвет — --k или цвет мира дня */
.kicker { display: inline-flex; align-items: center; gap: 10px; margin: 0; font: 500 12px/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--mute); }
.kicker::before { content: ""; flex: none; width: 8px; height: 8px; border-radius: 2px; background: var(--k, var(--world)); }
.kicker.sage { --k: var(--sage); }

/* Подпись блока: <span class="lbl">…</span>. У подписей тренажёров и карточек слева цветная точка (цвет — --c блока) */
.lbl { font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--mute); }
.result > .lbl, .quiz > .lbl, .sort > .lbl, .order > .lbl, .test > .lbl, .summary > .lbl, .task > .th .lbl, .demo-wrap > .dh .lbl,
.notebook .nh .lbl, .by-track > .bt-bar .lbl, .homework > .hh .lbl, .video-soon > .lbl, .img-soon .lbl, .loadout > .lbl, .os-pick > .lbl,
.card > .lbl:first-child, .nb-item .lbl {
  display: inline-flex; align-items: center; gap: 8px; color: var(--ink2);
}
.result > .lbl::before, .quiz > .lbl::before, .sort > .lbl::before, .order > .lbl::before, .test > .lbl::before, .summary > .lbl::before,
.task > .th .lbl::before, .demo-wrap > .dh .lbl::before, .notebook .nh .lbl::before, .by-track > .bt-bar .lbl::before, .homework > .hh .lbl::before,
.video-soon > .lbl::before, .img-soon .lbl::before, .loadout > .lbl::before, .os-pick > .lbl::before, .card > .lbl:first-child::before, .nb-item .lbl::before {
  content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; background: var(--c, var(--amber));
}

/* Термин с подсказкой: <span class="term" data-def="...">слово</span> */
.term { position: relative; border-bottom: 1px dashed color-mix(in srgb, var(--amber) 70%, transparent); cursor: help; }
.term:hover::after, .term.open::after, .term:focus::after {
  content: attr(data-def); position: absolute; left: 50%; bottom: calc(100% + 10px); z-index: 30; transform: translateX(calc(-50% + var(--tip-x, 0px)));
  width: max-content; max-width: min(320px, 80vw); padding: 11px 14px; border: 1px solid var(--line2); border-radius: 12px;
  background: var(--bg4); color: var(--ink); box-shadow: var(--shadow); font: 400 14px/1.5 var(--sans); letter-spacing: 0; text-transform: none;
  white-space: normal; text-align: left; pointer-events: none;
}

/* ================= Кнопки: белая главная и прозрачная с рамкой ================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 46px; padding: 0 20px;
  border: 1px solid var(--line2); border-radius: 12px; background: transparent; color: var(--ink); cursor: pointer;
  font: 600 15px/1.15 var(--sans); letter-spacing: -.005em; text-decoration: none; text-align: center;
  transition: background .2s, color .2s, border-color .2s, translate .15s;
}
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn:active { translate: 0 1px; }
.btn > span[aria-hidden] { transition: translate .2s; }
.btn:hover > span[aria-hidden] { translate: 3px 0; }
.btn.primary { border-color: var(--ink); background: var(--ink); color: var(--bg); }
.btn.primary:hover { border-color: #fff; background: #fff; color: var(--bg); }
.btn.ghost { border-color: var(--line2); background: transparent; color: var(--ink); }
.btn.ghost:hover { border-color: var(--ink); }
.btn.done, .btn.primary.done { border-color: color-mix(in srgb, var(--sage) 40%, transparent); background: var(--sage-soft); color: var(--sage); }
.btn.sm { gap: 7px; min-height: 34px; padding: 0 13px; border-radius: 10px; font-size: 13.5px; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .4; cursor: not-allowed; translate: none; }

/* ================= Шапка (course.js: buildTopbar) ================= */
.topbar {
  position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 14px; height: var(--head); padding: 0 24px;
  border-bottom: 1px solid var(--line); background: rgba(17, 18, 20, .84); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.topbar .brand { display: inline-flex; flex: none; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font: 700 15px/1 var(--sans); letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; }
.topbar .brand i { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: var(--ink); color: var(--bg); font: 800 13px/1 var(--sans); font-style: normal; letter-spacing: -.02em; text-transform: none; }
.topbar .crumb { flex: none; color: var(--line2); font-size: 18px; line-height: 1; }
.topbar .crumb-now { flex: none; color: var(--ink2); text-decoration: none; font: 500 15px/1 var(--sans); white-space: nowrap; transition: color .2s; }
.topbar .crumb-now:hover { color: var(--ink); }
.topbar .where { flex: 0 1 auto; min-width: 0; overflow: hidden; color: var(--mute); font: 500 15px/1.2 var(--sans); white-space: nowrap; text-overflow: ellipsis; }
.topbar .where b { color: var(--ink2); font-weight: 500; }
.topbar .sp { flex: 1; }
.tb-nav { display: flex; flex: none; align-items: center; gap: 4px; }
.topbar .tb {
  display: inline-flex; flex: none; align-items: center; gap: 8px; height: 38px; padding: 0 11px; border: 1px solid transparent; border-radius: 10px;
  background: transparent; color: var(--ink2); cursor: pointer; font: 500 15px/1 var(--sans); text-decoration: none; white-space: nowrap; transition: color .2s, background .2s, border-color .2s;
}
.topbar .tb:hover, .topbar .tb[aria-expanded="true"] { color: var(--ink); background: rgba(255, 255, 255, .04); }
.topbar .tb svg { flex: none; width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.topbar .tb .caret { width: 7px; height: 7px; margin: -3px 0 0 1px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; rotate: 45deg; opacity: .7; transition: rotate .2s, margin .2s; }
.topbar .tb[aria-expanded="true"] .caret { rotate: 225deg; margin-top: 3px; }
.topbar .tb.icon { width: 38px; padding: 0; justify-content: center; }
.topbar .menu-btn { display: none; margin-left: -6px; }
/* кнопка жанра: кадр учебной игры жанра в кружке + название */
.topbar .track-btn { gap: 9px; margin-left: 6px; padding: 0 13px 0 4px; border-color: var(--line); border-radius: 999px; height: 38px; }
.topbar .track-btn:hover { border-color: var(--line2); background: transparent; }
.topbar .track-btn.none { padding-left: 11px; }
.tb-thumb { flex: none; width: 28px; height: 28px; border-radius: 50%; object-fit: cover; background: var(--bg3); box-shadow: 0 0 0 1px var(--line2); }
.lang { display: flex; flex: none; gap: 4px; padding: 3px; border: 1px solid var(--line); border-radius: 10px; }
.lang a { padding: 4px 9px; border-radius: 7px; color: var(--ink2); font: 500 12px/1.4 var(--mono); text-decoration: none; transition: color .2s, background .2s; }
.lang a:hover { color: var(--ink); }
.lang a[aria-current] { background: var(--bg3); color: var(--ink); }
.progressline { position: absolute; left: 0; bottom: -1px; width: 0; height: 2px; background: var(--world); transition: width .4s; }

/* меню «Библиотека» */
.tb-menu { position: relative; display: inline-flex; }
.tb-pop {
  position: absolute; right: 0; top: calc(100% + 10px); z-index: 60; display: none; min-width: 280px; padding: 6px;
  border: 1px solid var(--line2); border-radius: 14px; background: var(--bg2); box-shadow: var(--shadow);
}
.tb-pop.open { display: grid; gap: 2px; animation: pop-in .18s ease-out; }
.tb-pop a { display: flex; align-items: center; gap: 12px; padding: 8px 10px 8px 8px; border-radius: 10px; color: var(--ink2); font: 500 14.5px/1.25 var(--sans); text-decoration: none; transition: background .15s, color .15s; }
.tb-pop a:hover, .tb-pop a:focus-visible { background: var(--bg3); color: var(--ink); }
.tb-pop .ico { display: grid; flex: none; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: color-mix(in srgb, var(--c) 14%, transparent); color: var(--c); }
.tb-pop .ico svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tb-pop .ico circle[r=".9"] { fill: currentColor; stroke: none; }
@keyframes pop-in { from { opacity: 0; translate: 0 -4px; } }

/* ================= Раскладка урока и оглавление ================= */
.layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); min-height: calc(100vh - var(--head)); }
.toc { position: sticky; top: var(--head); align-self: start; height: calc(100vh - var(--head)); overflow: auto; padding: 30px 18px 48px 24px; border-right: 1px solid var(--line); background: var(--bg); }
.toc .lesson-name { display: flex; align-items: center; gap: 10px; margin: 0 0 10px 8px; font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--mute); }
.toc .lesson-name::before { content: ""; flex: none; width: 8px; height: 8px; border-radius: 2px; background: var(--world); }
.toc .lesson-title { margin: 0 0 20px 8px; color: var(--ink); font: 700 19px/1.2 var(--sans); letter-spacing: -.025em; text-wrap: balance; }
.toc .meter-label { margin: 0 8px 8px; }
.toc .meter { margin: 0 8px 22px; }
.toc ol { display: flex; flex-direction: column; gap: 2px; margin: 0; padding: 0; list-style: none; }
.toc li { margin: 0; }
.toc li a { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 10px; align-items: start; padding: 8px 10px 9px 8px; border-radius: 10px; color: var(--ink2); font: 500 14.5px/1.35 var(--sans); text-decoration: none; transition: background .15s, color .15s; }
.toc li a:hover { background: var(--bg2); color: var(--ink); }
.toc li a.here { background: var(--bg3); color: var(--ink); }
.toc li a .dot { display: grid; place-items: center; width: 22px; height: 22px; margin-top: 1px; border: 1px solid var(--line2); border-radius: 50%; color: var(--mute); font: 500 10.5px/1 var(--mono); transition: background .2s, border-color .2s; }
.toc li a.here .dot { border-color: var(--ink); color: var(--ink); }
.toc li a.done .dot { border-color: var(--sage); background: var(--sage); color: #0b1a10; }
.toc li a.done .dot span { display: none; }
.toc li a.done .dot::after { content: ""; width: 9px; height: 5px; margin-top: -2px; border-left: 1.7px solid currentColor; border-bottom: 1.7px solid currentColor; rotate: -45deg; }
.toc li a small { display: block; margin-bottom: 2px; color: var(--mute); font: 500 10.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.toc .others { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); }
.toc .others .lbl { display: block; margin: 0 0 10px 8px; }
.toc .others a, .toc .others .soon { display: flex; align-items: baseline; gap: 10px; padding: 5px 8px; border-radius: 8px; color: var(--mute); font: 500 13.5px/1.35 var(--sans); text-decoration: none; transition: background .15s, color .15s; }
.toc .others a:hover { background: var(--bg2); color: var(--ink); }
.toc .others a.cur { background: var(--bg3); color: var(--ink); }
.toc .others b { flex: none; width: 20px; color: var(--c, var(--mute)); font: 500 12px/1 var(--mono); }
.toc .others .home { margin-bottom: 6px; color: var(--ink2); }
.toc .others .soon { opacity: .55; }
.toc .others .soon i { margin-left: auto; font: 500 10.5px/1 var(--mono); font-style: normal; letter-spacing: .06em; text-transform: uppercase; }
.toc .others .soon.cur { opacity: 1; color: var(--ink); }

main.lesson { min-width: 0; padding: 44px 32px 120px; container-type: inline-size; }
main.lesson > * { max-width: var(--read); margin-left: auto; margin-right: auto; }
main.lesson > .wide { max-width: var(--wide); }
/* широкий блок внутри шага: шаг узкий (--read), поэтому блок шире его и выровнен по центру колонки урока (100cqw - ширина main) */
.step > .wide { --w: min(var(--wide), 100cqw); width: var(--w); max-width: none; margin-left: calc(50% - var(--w) / 2); margin-right: 0; }

/* полоска прогресса */
.meter { overflow: hidden; height: 4px; border-radius: 2px; background: var(--bg4); }
.meter i { display: block; width: 0; height: 100%; border-radius: 2px; background: var(--sage); transition: width .4s; }
.meter-label { display: flex; justify-content: space-between; margin: 0 0 8px; color: var(--mute); font: 500 11.5px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.meter-label .pct { color: var(--ink2); }

/* ================= Шапка дня ================= */
.lesson-hero { position: relative; isolation: isolate; margin-bottom: 40px; }
.lesson-hero > .art { position: relative; margin: 0 0 32px; overflow: hidden; aspect-ratio: 2 / 1; border: 1px solid var(--line); border-radius: var(--r); background: var(--bg3); box-shadow: 0 50px 100px -60px rgba(0, 0, 0, .9); }
.lesson-hero > .art img { display: block; width: 100%; height: 100%; object-fit: cover; border: 0; border-radius: 0; }
.lesson-hero > .art .img-soon { height: 100%; min-height: 0; border: 0; border-radius: 0; }
/* размытая копия обложки за ней даёт мягкое цветное свечение (её вставляет course.js) */
.art-glow { position: absolute; left: 3%; top: 28px; z-index: -1; width: 94%; aspect-ratio: 2 / 1; object-fit: cover; filter: blur(64px) saturate(1.5); opacity: .42; pointer-events: none; }
.lesson-hero h1 { margin-top: 16px; }
.lesson-hero .lead { max-width: 64ch; }
.lesson-hero .meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 24px; }

.chip { display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255, 255, 255, .02); color: var(--ink2); font: 500 13.5px/1.35 var(--sans); }
a.chip { text-decoration: none; }
a.chip:hover { border-color: var(--line2); color: var(--ink); }
.chip.y, .chip.a, .chip.r { border-color: color-mix(in srgb, var(--c) 30%, transparent); background: color-mix(in srgb, var(--c) 9%, transparent); color: var(--ink); }
.chip.y::before, .chip.a::before, .chip.r::before { content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; background: var(--c); }
.chip.y { --c: var(--amber); }
.chip.a { --c: var(--sage); }
.chip.r { --c: var(--red); }
.chip code { padding: 1px 5px; font-size: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 16px; }

/* «что будет к концу дня» */
.result { --c: var(--world); position: relative; margin: 20px 0; padding: 20px 24px 18px; border: 1px solid var(--line); border-radius: 18px; background: var(--bg2); box-shadow: inset 0 2px 0 var(--c); }
.result > .lbl { margin-bottom: 10px; }
.result ul { margin: 0; }
.result li::marker { color: var(--c); }
p.how { display: block; margin: 14px 0 0; padding-top: 12px; border-top: 1px solid var(--line); font-size: 15.5px; color: var(--ink2); }

/* ================= Шаги ================= */
.step { position: relative; margin-top: 32px; padding: 56px 0 8px; border-top: 1px solid var(--line); }
.step:first-of-type { border-top: 0; }
.step > * { max-width: var(--read); margin-left: auto; margin-right: auto; }
.step-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 14px; }
.step-head .n { color: var(--mute); font: 500 12.5px/1 var(--mono); letter-spacing: .04em; }
.step-head .n:first-child { color: var(--ink2); }
.badge { --c: var(--ink2); display: inline-flex; align-items: center; gap: 7px; padding: 6px 11px 6px 9px; border-radius: 999px; background: color-mix(in srgb, var(--c) 12%, transparent); color: var(--c); font: 500 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge.theory { --c: var(--blue); }
.badge.practice { --c: var(--amber); }
.badge.trainer { --c: var(--teal); }
.badge.test { --c: var(--red); }
.badge.hw { --c: var(--amber); }
.badge.tool { --c: var(--ink2); }
.badge.video { --c: var(--blue); }
.step-done-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 32px; }

/* ================= Карточки и раскладка ================= */
.card { position: relative; padding: 20px 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--bg2); color: var(--ink2); }
.card > :last-child { margin-bottom: 0; }
.card h3:first-child, .card h4:first-child { margin-top: 0; }
.card h4 { margin-top: 0; }
.card > .lbl:first-child { margin-bottom: 8px; }
.card.you, .card.ai, .card.bad { border-color: color-mix(in srgb, var(--c) 30%, transparent); background: linear-gradient(160deg, color-mix(in srgb, var(--c) 10%, transparent), transparent 60%), var(--bg2); }
.card.you::before, .card.ai::before, .card.bad::before { content: ""; position: absolute; left: 22px; top: -1px; width: 36px; height: 2px; border-radius: 0 0 2px 2px; background: var(--c); }
.card.you { --c: var(--amber); }
.card.ai { --c: var(--sage); }
.card.bad { --c: var(--red); }
.card .num { margin-bottom: 8px; color: var(--c, var(--amber)); font: 800 40px/1 var(--sans); letter-spacing: -.045em; }
.grid { display: grid; gap: 14px; margin: 18px 0 22px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Сравнение «так не надо / так надо» */
.compare { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 18px 0 22px; }
.compare > div { position: relative; padding: 16px 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg2); }
.compare > div > :last-child { margin-bottom: 0; }
.compare .bad, .compare .good { border-color: color-mix(in srgb, var(--c) 28%, transparent); background: color-mix(in srgb, var(--c) 7%, var(--bg2)); }
.compare .bad { --c: var(--red); }
.compare .good { --c: var(--sage); }
.compare .bad::before, .compare .good::before { content: attr(data-label); display: block; margin-bottom: 8px; color: var(--c); font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.compare .bad:not([data-label])::before { content: "✗ так не надо"; }
.compare .good:not([data-label])::before { content: "✓ так надо"; }

/* Роли: ты / агент / инструмент */
.roles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 20px 0; }
.roles > div { padding-top: 12px; border-top: 2px solid var(--c, var(--line2)); color: var(--ink2); font-size: 15.5px; line-height: 1.55; }
.roles b { display: block; margin-bottom: 4px; color: var(--c, var(--ink)); font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.roles .you { --c: var(--amber); }
.roles .ai { --c: var(--sage); }
.roles .tool { --c: var(--ink2); }

/* Поток шагов: <div class="flow"><div class="you"><b>…</b>…</div>…</div> */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 10px; margin: 20px 0; counter-reset: fl; }
.flow > div { position: relative; flex: 1 1 130px; padding: 13px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg2); color: var(--ink2); font-size: 14.5px; line-height: 1.45; counter-increment: fl; }
.flow > div::before { content: counter(fl, decimal-leading-zero); display: block; margin-bottom: 6px; color: var(--c, var(--mute)); font: 500 12px/1 var(--mono); }
.flow > div b { display: block; margin-bottom: 2px; color: var(--ink); font-size: 15.5px; }
.flow > div.you { --c: var(--amber); border-color: color-mix(in srgb, var(--amber) 30%, transparent); }
.flow > div.ai { --c: var(--sage); border-color: color-mix(in srgb, var(--sage) 30%, transparent); }

/* Нумерованная инструкция: <ol class="steps"><li><b>Заголовок</b>текст</li></ol> */
ol.steps { display: flex; flex-direction: column; gap: 14px; margin: 20px 0; padding: 0; list-style: none; counter-reset: st; }
ol.steps > li { position: relative; margin: 0; padding: 3px 0 3px 50px; counter-increment: st; }
ol.steps > li::before { content: counter(st, decimal-leading-zero); position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg2); color: var(--amber); font: 500 12.5px/1 var(--mono); }
ol.steps > li > b:first-child { display: block; margin-bottom: 2px; color: var(--ink); font-size: 17px; }

/* ================= Врезки ================= */
/* <div class="callout tip|warn|mistake|example|game|pro|why" [data-label="…"]>…</div>: мягкая подложка роли и тонкая полоска слева */
.callout { --c: var(--mute); position: relative; margin: 22px 0; padding: 16px 20px 16px 22px; border-radius: 14px; background: color-mix(in srgb, var(--c) 8%, var(--bg2)); color: var(--ink2); }
.callout::after { content: ""; position: absolute; left: 0; top: 14px; bottom: 14px; width: 2px; border-radius: 2px; background: var(--c); }
.callout::before { content: attr(data-label); display: block; margin-bottom: 6px; color: var(--c); font: 500 11.5px/1.35 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.callout:not([data-label])::before { content: none; }
.callout > :last-child { margin-bottom: 0; }
.callout h3:first-child, .callout h4:first-child { margin-top: 0; }
.callout.tip { --c: var(--sage); }
.callout.warn { --c: var(--amber); }
.callout.mistake { --c: var(--red); }
.callout.example { --c: var(--amber); }
.callout.game { --c: var(--teal); }
.callout.pro { --c: var(--ink2); background: var(--bg2); box-shadow: inset 0 0 0 1px var(--line); }
.callout.why { --c: var(--blue); }
.callout.star-more { --c: var(--amber); background: linear-gradient(160deg, var(--amber-soft), transparent 60%), var(--bg2); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--amber) 22%, transparent); }
/* подписи до запуска движка (обычно их ставит course.js в data-label) */
.callout.tip:not([data-label])::before { content: "совет"; }
.callout.warn:not([data-label])::before { content: "осторожно"; }
.callout.mistake:not([data-label])::before { content: "частая ошибка"; }
.callout.example:not([data-label])::before { content: "пример"; }
.callout.game:not([data-label])::before { content: "как в известных играх"; }
.callout.pro:not([data-label])::before { content: "из практики"; }
.callout.why:not([data-label])::before { content: "зачем это"; }
html[lang="en"] .compare .bad:not([data-label])::before { content: "✗ don't"; }
html[lang="en"] .compare .good:not([data-label])::before { content: "✓ do"; }
html[lang="en"] .callout.tip:not([data-label])::before { content: "tip"; }
html[lang="en"] .callout.warn:not([data-label])::before { content: "careful"; }
html[lang="en"] .callout.mistake:not([data-label])::before { content: "common mistake"; }
html[lang="en"] .callout.example:not([data-label])::before { content: "example"; }
html[lang="en"] .callout.game:not([data-label])::before { content: "in well-known games"; }
html[lang="en"] .callout.pro:not([data-label])::before { content: "from experience"; }
html[lang="en"] .callout.why:not([data-label])::before { content: "why this matters"; }

/* Цитата */
blockquote { margin: 24px 0; padding: 4px 0 4px 22px; border-left: 2px solid var(--amber); color: var(--ink); font: 500 19px/1.5 var(--sans); letter-spacing: -.01em; }
blockquote cite { display: block; margin-top: 8px; color: var(--mute); font: 500 12.5px/1.4 var(--mono); font-style: normal; }

/* Раскрывашка: <details class="more [other|err]"><summary>…</summary><div class="in">…</div></details>
   other — «как это делает другой путь», err — частые ошибки */
details.more { --c: var(--amber); margin: 16px 0; border: 1px solid var(--line); border-radius: 14px; background: var(--bg2); transition: border-color .2s; }
details.more:hover, details.more[open] { border-color: var(--line2); }
details.more > summary { display: flex; align-items: center; gap: 14px; min-height: 52px; padding: 12px 18px; cursor: pointer; list-style: none; color: var(--ink); font: 600 16px/1.35 var(--sans); letter-spacing: -.01em; }
details.more > summary::-webkit-details-marker { display: none; }
details.more > summary::after { content: ""; flex: none; width: 9px; height: 9px; margin: -4px 4px 0 auto; border-right: 1.5px solid var(--mute); border-bottom: 1.5px solid var(--mute); rotate: 45deg; transition: rotate .25s, margin .25s, border-color .2s; }
details.more[open] > summary::after { rotate: 225deg; margin-top: 4px; border-color: var(--c); }
details.more > summary:hover::after { border-color: var(--ink); }
details.more > .in { padding: 2px 18px 12px; }
details.more > .in > :first-child { margin-top: 0; }
details.more.other { --c: var(--blue); background: transparent; border-style: dashed; }
details.more.other > summary { color: var(--ink2); font-size: 15px; font-weight: 500; }
details.more.other > summary::before { content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; background: var(--c); }
details.more.err { --c: var(--red); }
details.more.err > summary::before { content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; background: var(--c); }
details.more .table-wrap { margin: 8px 0 12px; }

/* ================= Промпты, код, файлы ================= */
.prompt, .file, pre.code { position: relative; margin: 18px 0 22px; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--code); color: var(--code-ink); }
.prompt .ph, .file .fn { display: flex; align-items: center; gap: 10px; min-height: 40px; padding: 0 8px 0 16px; border-bottom: 1px solid var(--line); color: var(--code-mute); font: 500 11.5px/1.2 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
/* зелёная точка «агент»: промпт отдаём агенту */
.prompt .ph::before { content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; background: var(--sage); box-shadow: 0 0 0 3px rgba(61, 220, 132, .15); }
.file .fn { letter-spacing: .02em; text-transform: none; }
.file .fn::before { content: ""; flex: none; width: 8px; height: 8px; margin-right: 26px; border-radius: 50%; background: var(--line2); box-shadow: 13px 0 0 var(--line2), 26px 0 0 var(--line2); }
.prompt .pb, .file .fb, pre.code { margin: 0; padding: 14px 18px 16px; font: 400 14.5px/1.65 var(--mono); white-space: pre-wrap; word-break: break-word; }
.prompt.one .pb { padding: 11px 16px 13px; }
pre.code { padding: 16px 18px; }
.prompt .pb .c, .file .fb .c, pre.code .c { color: var(--code-mute); }
.file .fb .k, pre.code .k { color: var(--amber); }
.file .fb .s, pre.code .s { color: var(--sage); }
.file .fb .h { color: #fff; font-weight: 600; }
.prompt.where { border-color: color-mix(in srgb, var(--amber) 40%, transparent); }
.copy-btn { flex: none; height: 28px; margin-left: auto; padding: 0 11px; border: 1px solid var(--line2); border-radius: 8px; background: transparent; color: var(--ink2); cursor: pointer; font: 500 11.5px/1 var(--mono); letter-spacing: .02em; text-transform: none; transition: color .2s, border-color .2s, background .2s; }
.copy-btn:hover { border-color: var(--ink); color: var(--ink); }
.copy-btn.ok { border-color: color-mix(in srgb, var(--sage) 50%, transparent); background: var(--sage-soft); color: var(--sage); }
pre.code .copy-btn { position: absolute; right: 10px; top: 10px; }

/* Команда терминала: <div class="term-line">npm run dev</div> */
.term-line { display: flex; align-items: center; gap: 10px; margin: 12px 0; padding: 9px 10px 9px 14px; overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: var(--code); color: var(--code-ink); font: 400 14.5px/1.5 var(--mono); }
.term-line::before { content: "$"; flex: none; color: var(--sage); }
.term-line .copy-btn { flex: none; }
.term-line span.cmd { flex: 1 1 auto; min-width: 0; overflow-x: auto; white-space: pre; }

/* Окно-макет интерфейса */
.mock { margin: 20px 0; overflow: hidden; border: 1px solid var(--line2); border-radius: 14px; background: var(--bg2); box-shadow: var(--shadow); }
.mock .bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--bg3); color: var(--mute); font: 500 12px/1 var(--mono); }
.mock .bar::before { content: ""; flex: none; width: 9px; height: 9px; margin-right: 30px; border-radius: 50%; background: var(--line2); box-shadow: 14px 0 0 var(--line2), 28px 0 0 var(--line2); }
.mock .body { padding: 16px; }

/* Дерево файлов */
.tree { margin: 18px 0; padding: 14px 18px; overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--code); color: var(--code-ink); font: 400 14px/1.7 var(--mono); white-space: pre; }
.tree .d { color: var(--amber); }
.tree .c { color: var(--code-mute); }

/* ================= Таблицы ================= */
.table-wrap { margin: 18px 0 24px; overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--bg2); }
table.t, .rubric { width: 100%; border-collapse: collapse; font-size: 15.5px; line-height: 1.5; }
table.t th, .rubric th { padding: 0 14px 10px 0; border-bottom: 1px solid var(--line2); color: var(--mute); font: 500 11px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; text-align: left; vertical-align: bottom; }
table.t td, .rubric td { padding: 11px 14px 11px 0; border-bottom: 1px solid var(--line); color: var(--ink2); vertical-align: top; }
table.t td:first-child, .rubric td:first-child { color: var(--ink); font-weight: 500; }
table.t tbody tr:last-child td, .rubric tbody tr:last-child td { border-bottom: 0; }
.table-wrap table.t th, .table-wrap .rubric th { padding-top: 13px; background: rgba(255, 255, 255, .02); }
.table-wrap table.t th:first-child, .table-wrap table.t td:first-child, .table-wrap .rubric th:first-child, .table-wrap .rubric td:first-child { padding-left: 18px; }
.table-wrap table.t th:last-child, .table-wrap table.t td:last-child, .table-wrap .rubric th:last-child, .table-wrap .rubric td:last-child { padding-right: 18px; }
table.t td.y { color: var(--amber); font: 500 14.5px/1.5 var(--mono); }
table.t td.m { font: 400 14px/1.5 var(--mono); }
.rubric { margin: 10px 0 18px; font-size: 15px; }

/* ================= Картинки и видео ================= */
figure { margin: 22px 0; }
figure img, figure video { display: block; width: 100%; border: 1px solid var(--line); border-radius: 14px; }
figure svg { display: block; width: 100%; height: auto; }
figcaption { margin-top: 10px; color: var(--mute); font: 400 13px/1.5 var(--mono); }
.diagram { padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg2); }
.diagram img, .diagram svg { border: 0; }
/* видео-вставка: разметку не трогаем, меняется только рамка вокруг плеера */
figure.video-insert { margin: 26px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: var(--bg2); }
main.lesson > figure.video-insert { margin-inline: auto; }  /* видео мира прямо в уроке: по центру колонки, как остальное */
figure.video-insert video { display: none; width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 0; background: #000; }
figure.video-insert.has-video video { display: block; }
figure.video-insert.has-video .video-soon { display: none; }
figure.video-insert figcaption { margin: 0; padding: 12px 18px 14px; border-top: 1px solid var(--line); }
.video-soon { --c: var(--blue); padding: 18px 20px; }
.video-soon > .lbl { display: flex; margin-bottom: 8px; }
.video-soon > p { margin: 0 0 10px; color: var(--ink2); font-size: 15px; }
.video-insert .script { padding-left: 14px; border-left: 2px solid var(--line2); color: var(--ink2); font-size: 15px; }
.video-insert .script p { margin: 0 0 8px; }
.video-insert .script .scene { display: block; margin-top: 10px; color: var(--mute); font: 500 11.5px/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
/* картинка ещё не готова */
.img-soon { --c: var(--mute); display: flex; flex-direction: column; justify-content: center; gap: 8px; min-height: 180px; padding: 22px; border: 1px dashed var(--line2); border-radius: 14px; background: radial-gradient(400px 200px at 80% 0%, rgba(46, 196, 182, .07), transparent 70%), var(--bg2); color: var(--ink2); font-size: 14px; }

/* ================= Тренажёры ================= */
.quiz, .sort, .order, .task, .test:not(.badge), .homework, .notebook, .demo-wrap, .by-track { margin: 26px 0; border: 1px solid var(--line); border-radius: 18px; background: var(--bg2); }
.quiz > .lbl, .sort > .lbl, .order > .lbl { --c: var(--teal); display: flex; margin-bottom: 10px; }
.quiz .q, .sort .q, .order .q { margin: 0 0 14px; color: var(--ink); font: 600 18px/1.45 var(--sans); letter-spacing: -.01em; }

/* Вопрос: <div class="quiz" data-id="…" [data-multi]><p class="q">…</p><ul><li data-correct>…<span class="why">…</span></li></ul></div> */
.quiz { padding: 22px 24px 20px; }
.quiz ul { display: flex; flex-direction: column; gap: 8px; margin: 0; padding: 0; list-style: none; }
.quiz li { margin: 0; }
.quiz .opt {
  display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 12px; align-items: start; width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--bg3); color: var(--ink2); cursor: pointer; font: 400 16px/1.5 var(--sans); text-align: left; transition: border-color .2s, background .2s, color .2s;
}
.quiz .opt:hover:not(:disabled) { border-color: var(--line2); background: var(--bg4); color: var(--ink); }
.quiz .opt:disabled { cursor: default; }
.quiz .opt .mk { position: relative; display: grid; place-items: center; width: 20px; height: 20px; margin-top: 2px; border: 1.5px solid var(--line2); border-radius: 50%; color: #111214; transition: background .2s, border-color .2s; }
.quiz[data-multi] .opt .mk { border-radius: 6px; }
.quiz .opt .mk::after { content: ""; display: none; width: 8px; height: 4.5px; margin-top: -2px; border-left: 1.8px solid currentColor; border-bottom: 1.8px solid currentColor; rotate: -45deg; }
.quiz .opt.sel { border-color: color-mix(in srgb, var(--amber) 45%, transparent); background: var(--amber-soft); color: var(--ink); }
.quiz .opt.sel .mk { border-color: var(--amber); background: var(--amber); }
.quiz .opt.sel .mk::after, .quiz .opt.right .mk::after { display: block; }
.quiz .opt.right { border-color: color-mix(in srgb, var(--sage) 45%, transparent); background: var(--sage-soft); color: var(--ink); }
.quiz .opt.right .mk { border-color: var(--sage); background: var(--sage); }
.quiz .opt.wrong { border-color: color-mix(in srgb, var(--red) 45%, transparent); background: var(--red-soft); color: var(--ink2); }
.quiz .opt.wrong .mk { border-color: var(--red); background: var(--red); }
.quiz .opt.wrong .mk::before, .quiz .opt.wrong .mk::after { content: ""; position: absolute; inset: 0; display: block; width: 9px; height: 1.8px; margin: auto; border: 0; border-radius: 1px; background: currentColor; rotate: 45deg; }
.quiz .opt.wrong .mk::after { rotate: -45deg; }
.quiz .opt.miss { border-style: dashed; border-color: color-mix(in srgb, var(--sage) 60%, transparent); }
.quiz .why { display: none; }
.quiz .fb { display: none; margin-top: 12px; padding: 13px 16px; border-radius: 12px; color: var(--ink); font-size: 15.5px; line-height: 1.55; }
.quiz .fb.show { display: block; animation: fade-up .3s ease-out; }
.quiz .fb.ok { background: var(--sage-soft); }
.quiz .fb.no { background: var(--red-soft); }
.quiz .fb b { display: block; margin-bottom: 4px; font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.quiz .fb.ok b { color: var(--sage); }
.quiz .fb.no b { color: var(--red); }
.quiz .qrow { display: flex; align-items: center; gap: 10px; margin-top: 14px; }

/* Итоговый тест: <div class="test" data-id="…"><div class="quiz">…</div>…</div> */
.test:not(.badge) { --c: var(--red); padding: 22px 24px; box-shadow: inset 0 2px 0 var(--c); }
.test > .lbl { display: flex; margin-bottom: 6px; }
.test .quiz { margin: 14px 0; background: var(--bg); }
.test .quiz .opt { background: var(--bg2); }
.test .quiz .opt:hover:not(:disabled) { background: var(--bg3); }
.test .tres { display: none; margin-top: 18px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg3); }
.test .tres.show { display: block; animation: fade-up .3s ease-out; }
.test .tres .big { font: 800 44px/1 var(--sans); letter-spacing: -.045em; }
.test .tres.pass { border-color: color-mix(in srgb, var(--sage) 40%, transparent); }
.test .tres.pass .big { color: var(--sage); }
.test .tres.fail { border-color: color-mix(in srgb, var(--amber) 40%, transparent); }
.test .tres.fail .big { color: var(--amber); }

/* Сортировка: <div class="sort" data-buckets="A|B"><p class="q">…</p><div data-bucket="0" data-hint="…">…</div></div> */
.sort { padding: 22px 24px; }
.sort .items { display: flex; flex-direction: column; gap: 8px; }
.sort .item { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 14px; padding: 11px 12px 11px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg3); color: var(--ink); font-size: 15.5px; line-height: 1.45; transition: border-color .2s, background .2s; }
.sort .item .txt { flex: 1 1 260px; }
.sort .item .bk { display: flex; flex-wrap: wrap; gap: 6px; }
.sort .item .bk button { height: 32px; padding: 0 12px; border: 1px solid var(--line2); border-radius: 999px; background: transparent; color: var(--ink2); cursor: pointer; font: 500 13px/1 var(--sans); transition: border-color .2s, color .2s, background .2s; }
.sort .item .bk button:hover { border-color: var(--ink); color: var(--ink); }
.sort .item.ok { border-color: color-mix(in srgb, var(--sage) 40%, transparent); background: var(--sage-soft); }
.sort .item.ok .bk button { display: none; }
.sort .item.ok .bk::after { content: "✓ " attr(data-answer); color: var(--sage); font: 500 11.5px/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.sort .item .hint { display: none; flex-basis: 100%; color: var(--ink2); font-size: 14px; }
.sort .item.ok .hint, .sort .item.bad .hint { display: block; }
.sort .item.bad { border-color: color-mix(in srgb, var(--red) 55%, transparent); animation: flash-red .5s ease-out; }
.sort .score, .order .score { margin-top: 14px; color: var(--mute); font: 500 12.5px/1.3 var(--mono); letter-spacing: .02em; }
.sort .score.win, .order .score.win { color: var(--sage); }

/* Порядок: <div class="order"><p class="q">…</p><ol><li>первый</li>…</ol></div>, движок перемешает */
.order { padding: 22px 24px; }
.order .pool { display: flex; flex-wrap: wrap; gap: 8px; }
.order .pool button { padding: 9px 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--bg3); color: var(--ink); cursor: pointer; font: 500 15px/1.35 var(--sans); text-align: left; transition: border-color .2s, background .2s; }
.order .pool button:hover { border-color: var(--line2); background: var(--bg4); }
.order .pool button.bad { border-color: color-mix(in srgb, var(--red) 55%, transparent); animation: flash-red .5s ease-out; }
.order .seq { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; counter-reset: oq; }
.order .seq:empty { display: none; }
.order .seq div { padding: 9px 14px; border: 1px solid color-mix(in srgb, var(--sage) 30%, transparent); border-radius: 11px; background: var(--sage-soft); color: var(--ink); font-size: 15px; counter-increment: oq; animation: fade-up .25s ease-out; }
.order .seq div::before { content: counter(oq, decimal-leading-zero) "  "; color: var(--sage); font: 500 12.5px var(--mono); white-space: pre; }

/* Чек-лист: <ul class="check" data-id="…"><li>…</li></ul> */
ul.check { display: flex; flex-direction: column; gap: 4px; margin: 12px 0 16px; padding: 0; list-style: none; }
ul.check li { margin: 0; }
ul.check label { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 12px; align-items: start; padding: 8px 10px; border-radius: 10px; color: var(--ink2); cursor: pointer; transition: background .15s; }
ul.check label:hover { background: rgba(255, 255, 255, .03); }
ul.check input {
  appearance: none; -webkit-appearance: none; width: 20px; height: 20px; margin: 3px 0 0; border: 1.5px solid var(--line2); border-radius: 6px;
  background: transparent center / 12px 12px no-repeat; cursor: pointer; transition: background-color .2s, border-color .2s;
}
ul.check input:hover { border-color: var(--ink2); }
ul.check input:checked { border-color: var(--sage); background-color: var(--sage); background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6.3 5 8.7l4.6-5' fill='none' stroke='%230b1a10' stroke-width='1.9' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); }
ul.check input:checked + span { color: var(--ink); }

/* Практическое задание: <div class="task" data-title="…" data-time="…">…</div> */
.task { --c: var(--amber); overflow: hidden; box-shadow: inset 0 2px 0 var(--c); }
.task > .th { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; padding: 16px 22px 14px; border-bottom: 1px solid var(--line); background: linear-gradient(color-mix(in srgb, var(--c) 9%, transparent), transparent); }
.task > .th h4 { flex: 1 1 260px; margin: 0; font-size: 17.5px; }
.task > .th .time { margin-left: auto; color: var(--mute); font: 500 12px/1 var(--mono); white-space: nowrap; }
.task > .tb { padding: 16px 22px 8px; }
.task > .tb > :first-child { margin-top: 0; }
.task.done { --c: var(--sage); }

/* Рабочая тетрадь: <div class="notebook" data-note="…" data-label="…"></div> */
.notebook { --c: var(--amber); padding: 16px 18px 14px; }
.notebook .nh { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.notebook .nh .saved { margin-left: auto; color: var(--sage); font: 500 11.5px/1 var(--mono); }
.notebook .hintline { margin-bottom: 10px; color: var(--mute); font-size: 14.5px; }
.notebook textarea {
  display: block; width: 100%; min-height: 120px; padding: 12px 14px; resize: vertical; border: 1px solid var(--line); border-radius: 12px;
  background: var(--bg); color: var(--ink); font: 400 15px/1.6 var(--sans); outline: none; transition: border-color .2s, box-shadow .2s;
}
.notebook textarea::placeholder { color: var(--mute); }
.notebook textarea:focus { border-color: var(--line2); box-shadow: 0 0 0 3px var(--amber-soft); }

/* Живой тренажёр: <div class="demo-wrap"><div class="dh"><span class="lbl">…</span><span>…</span></div><div class="demo" data-demo="…"></div><div class="dc"></div><div class="dn">…</div></div> */
.demo-wrap { --c: var(--teal); overflow: hidden; }
.demo-wrap > .dh { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; padding: 12px 18px; border-bottom: 1px solid var(--line); }
.demo-wrap > .dh span:not(.lbl) { color: var(--ink); font: 600 15px/1.3 var(--sans); letter-spacing: -.01em; }
.demo { position: relative; min-height: 240px; background: #0a0b0d; }
.demo canvas { display: block; width: 100%; }
.demo-wrap > .dc { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; padding: 12px 18px; border-top: 1px solid var(--line); color: var(--ink2); font-size: 14px; }
.demo-wrap > .dc:empty { display: none; }
.demo-wrap > .dn { padding: 12px 18px 14px; border-top: 1px solid var(--line); color: var(--mute); font-size: 14.5px; }
.ctrl { display: inline-flex; align-items: center; gap: 10px; color: var(--ink2); font: 500 13px/1.2 var(--mono); }
.ctrl input[type=range] { width: 140px; accent-color: var(--amber); }
.ctrl output { min-width: 52px; color: var(--amber); font-weight: 500; }
/* переключатель внутри тренажёра: <div class="toggle"><button class="on">…</button>…</div> */
.toggle { display: inline-flex; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 11px; }
.toggle button { height: 32px; padding: 0 12px; border: 0; border-radius: 8px; background: transparent; color: var(--ink2); cursor: pointer; font: 500 13.5px/1 var(--sans); transition: background .2s, color .2s; }
.toggle button:hover { color: var(--ink); }
.toggle button.on { background: var(--bg4); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line2); }

/* Домашнее задание: <div class="homework"><div class="hh"><div class="lbl">…</div><h3>…</h3></div><div class="hb">…</div></div> */
.homework { --c: var(--amber); overflow: hidden; box-shadow: inset 0 2px 0 var(--c); }
.homework > .hh { padding: 22px 24px 18px; border-bottom: 1px solid var(--line); background: linear-gradient(color-mix(in srgb, var(--c) 10%, transparent), transparent); }
.homework > .hh h3 { margin: 8px 0 0; font-size: 24px; letter-spacing: -.03em; }
.homework > .hb { padding: 18px 24px 12px; }
.homework .level { display: flex; align-items: center; gap: 9px; margin: 22px 0 6px; color: var(--ink2); font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.homework .level:first-child { margin-top: 0; }
.homework .level::before { content: ""; flex: none; width: 8px; height: 8px; border-radius: 2px; background: var(--amber); }
.homework .level.star::before { background: var(--teal); }
.homework .by-track, .homework .notebook { background: var(--bg); }

/* Шпаргалка «запомнить» */
.summary { --c: var(--amber); position: relative; margin: 26px 0; padding: 22px 24px 18px; border: 1px solid var(--line); border-radius: 18px; background: var(--bg2); }
.summary::before { content: ""; position: absolute; left: 24px; top: -1px; width: 120px; height: 2px; background: linear-gradient(90deg, var(--amber) 0 25%, var(--red) 25% 50%, var(--teal) 50% 75%, var(--blue) 75%); }
.summary > .lbl { display: flex; margin-bottom: 12px; }
.summary ul { margin: 0; padding-left: 20px; }
.summary li { margin: 7px 0; color: var(--ink2); }
.summary li::marker { color: var(--amber); }

/* Источники */
ol.sources { padding-left: 24px; color: var(--ink2); font-size: 15px; }
ol.sources li { margin: 9px 0; }
ol.sources a { word-break: break-word; text-decoration-color: var(--line2); }
ol.sources a:hover { text-decoration-color: var(--ink); }
ol.sources .src-meta { color: var(--mute); font: 400 12.5px/1.4 var(--mono); }

/* ================= Жанр ученика ================= */
/* <div class="by-track" data-id="…"><div data-track="platformer">…</div>…</div>: движок добавит полоску жанров и покажет жанр ученика */
.by-track { overflow: hidden; }
.by-track > .bt-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding: 12px 16px; border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .015); }
.by-track > .bt-bar .lbl { margin-right: 8px; }
.by-track > .bt-bar button { height: 30px; padding: 0 12px; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--ink2); cursor: pointer; font: 500 13px/1 var(--sans); white-space: nowrap; transition: border-color .2s, color .2s, background .2s; }
.by-track > .bt-bar button:hover { border-color: var(--line2); color: var(--ink); }
.by-track > .bt-bar button.on { border-color: color-mix(in srgb, var(--amber) 50%, transparent); background: var(--amber-soft); color: var(--ink); }
.by-track > .bt-hint { padding: 12px 22px 0; color: var(--mute); font-size: 14.5px; }
.by-track > .bt-hint .btn { margin-top: 2px; }
.by-track > [data-track] { display: none; padding: 18px 22px 8px; }
.by-track > [data-track].on { display: block; animation: fade-up .25s ease-out; }
.by-track > [data-track] > :first-child { margin-top: 0; }

/* Карточки жанров в уроке: <div class="track-picker"></div> (рисует движок, картинки — кадры учебных игр) */
.track-picker { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin: 22px 0; }
.tcard { position: relative; display: flex; flex-direction: column; overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: var(--bg2); cursor: pointer; transition: border-color .25s, translate .25s, box-shadow .25s; }
.tcard:hover { border-color: var(--line2); translate: 0 -2px; }
.tcard.on { border-color: var(--ink); box-shadow: 0 0 0 1px var(--ink); }
.tcard .timg { position: relative; overflow: hidden; aspect-ratio: 16 / 9; background: var(--bg3); }
.tcard .timg img { display: block; width: 100%; height: 100%; object-fit: cover; border: 0; border-radius: 0; transition: scale .5s cubic-bezier(.2, .7, .2, 1); }
.tcard:hover .timg img { scale: 1.04; }
.tcard .timg .img-soon { height: 100%; min-height: 0; border: 0; border-radius: 0; }
.tcard .tbody { display: flex; flex: 1; flex-direction: column; gap: 4px; padding: 14px 16px 16px; }
.tcard b { color: var(--ink); font-size: 17px; letter-spacing: -.015em; }
.tcard .tgames { color: var(--mute); font: 400 12px/1.45 var(--mono); }
.tcard p { margin: 6px 0 10px; color: var(--ink2); font-size: 14.5px; line-height: 1.5; }
.tcard .tfoot { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; }
.tlevel { display: inline-flex; gap: 3px; }
.tlevel i { width: 16px; height: 5px; border-radius: 2px; background: var(--bg4); }
.tlevel i.on { background: var(--amber); }
.tcard.on .tpick { border-color: var(--ink); background: var(--ink); color: var(--bg); }

/* ================= Выборы ученика: система, агент, способ, 2D/3D (course.js: tabsMemory, GLOBAL_CHOICES) =================
   <div class="os-pick">…<span class="seg"><button data-os="mac">…</button>…</span></div> + <div class="by-os"><div data-os="mac">…</div>…</div>
   <div class="choice seg" data-key="…"><button data-v="…">…[<small>подпись</small>]</button>…</div> + <div class="by-choice" data-key="…"><div data-v="…">…</div>…</div>
   Без JS видны все варианты подряд, каждый со своей плашкой .os-tag. */
.os-hide, .choice-hide { display: none !important; }
html:not(.tabs-ready) span[data-os] + span[data-os]::before { content: " / "; }
.os-pick { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin: 18px 0; }
.os-pick > .lbl { --c: var(--blue); }
.os-pick .seg, .choice.seg { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.os-pick .seg button, .choice.seg > button {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; padding: 0 16px; border: 1px solid var(--line); border-radius: 11px;
  background: transparent; color: var(--ink2); cursor: pointer; font: 600 14.5px/1.15 var(--sans); letter-spacing: -.005em; transition: border-color .2s, color .2s, background .2s;
}
.os-pick .seg button:hover, .choice.seg > button:hover { border-color: var(--line2); color: var(--ink); }
.os-pick .seg button.on, .choice.seg > button.on { border-color: var(--ink); background: var(--bg3); color: var(--ink); }
.os-pick .seg button i { font-style: normal; opacity: .8; }
.os-pick.mini { margin: 10px 0 14px; }
.os-pick .os-phone { flex-basis: 100%; margin: 0; color: var(--blue); font-size: 14.5px; }
/* кнопка с подписью второй строкой: <button data-v="3d">Макет по картинке<small>без доплат</small></button> */
.choice.seg > button:has(> small) { flex-direction: column; align-items: flex-start; gap: 3px; min-height: 54px; padding: 8px 16px; text-align: left; }
.choice.seg > button > small { color: var(--mute); font: 400 12px/1.3 var(--mono); letter-spacing: 0; }
.choice.seg > button.on > small { color: var(--ink2); }
.choice.seg:has(> button > small) { margin: 6px 0 14px; }
.os-tag { display: inline-block; margin: 0 8px 6px 0; padding: 4px 9px; border: 1px solid var(--line); border-radius: 999px; background: var(--bg3); color: var(--ink2); font: 500 11px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; vertical-align: 2px; }
.os-miss { margin: 0 0 12px; padding: 10px 14px; border-radius: 12px; background: var(--blue-soft); color: var(--ink); font-size: 14.5px; }

/* Сквозные выборы на <html data-agent data-mode data-dim data-gen data-os>: чужой вариант прячется.
   Прячется только то, где назван другой известный вариант: пустой data-mode у чужих демо не трогаем. */
:root[data-agent="claude"] [data-agent~="codex"]:not([data-agent~="claude"]),
:root[data-agent="codex"] [data-agent~="claude"]:not([data-agent~="codex"]),
:root[data-mode="cli"] [data-mode~="app"]:not([data-mode~="cli"]),
:root[data-mode="app"] [data-mode~="cli"]:not([data-mode~="app"]),
:root[data-dim="2d"] [data-dim~="3d"]:not([data-dim~="2d"]),
:root[data-dim="3d"] [data-dim~="2d"]:not([data-dim~="3d"]) { display: none !important; }
:root[data-gen="api"] [data-gen]:not([data-gen~="api"]),
:root[data-gen="plus"] [data-gen]:not([data-gen~="plus"]),
:root[data-gen="local"] [data-gen]:not([data-gen~="local"]) { display: none !important; }
.by-agent > [data-agent] > :first-child, .by-mode > [data-mode] > :first-child { margin-top: 0; }

/* «Чем работаю» в начале урока: компьютер, агент, способ запуска */
.loadout { --c: var(--blue); margin: 20px 0 24px; padding: 16px 20px 12px; border: 1px solid var(--line); border-radius: 18px; background: var(--bg2); }
.loadout > .lbl { display: flex; margin-bottom: 6px; }
.loadout .os-pick, .loadout .lo-row { display: grid; grid-template-columns: 150px minmax(0, 1fr); align-items: center; gap: 8px 14px; margin: 0; padding: 12px 0; border-top: 1px solid var(--line); }
.loadout .os-pick { border-top: 0; }
.loadout .os-pick > .lbl, .loadout .lo-row > .lbl { color: var(--ink2); }
.loadout .os-pick > .lbl::before { content: none; }
.loadout .os-pick .os-phone { grid-column: 1 / -1; }
.loadout .choice.seg > button { flex-direction: column; align-items: flex-start; gap: 3px; min-height: 54px; padding: 8px 16px; text-align: left; }
.loadout .choice.seg > button small { color: var(--mute); font: 400 12px/1.3 var(--mono); }
.loadout .lo-note { margin: 8px 0 0; color: var(--mute); font-size: 14.5px; }

/* ================= «Твоя игра по дням» (.game-progress) и навигация по дням (.day-nav) =================
   Разметку рисует course.js. Ставится в шапку дня (.lesson-hero) и в конец дня. */
.game-progress { margin: 26px 0; padding: 18px 20px 16px; border: 1px solid var(--line); border-radius: 18px; background: var(--bg2); }
.game-progress[hidden] { display: none; }
.gp-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 12px; margin: 0 0 14px; }
.gp-lbl { display: inline-flex; align-items: center; gap: 10px; color: var(--ink2); font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.gp-lbl::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: linear-gradient(135deg, var(--amber) 0 50%, var(--teal) 50%); }
.gp-count { color: var(--mute); font: 400 12px/1.3 var(--mono); }
.gp-worlds { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; }
.gp-world { --wc: var(--amber); display: flex; flex-direction: column; gap: 7px; min-width: 0; margin: 0; }
.gp-world.w2 { --wc: var(--red); }
.gp-world.w3 { --wc: var(--teal); }
.gp-world.w4 { --wc: var(--blue); }
.gp-wn { overflow: hidden; color: var(--wc); font: 500 10.5px/1.2 var(--mono); letter-spacing: .07em; text-transform: uppercase; white-space: nowrap; text-overflow: ellipsis; }
.gp-days { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 4px; margin: 0; padding: 0; list-style: none; }
.gp-day { min-width: 0; margin: 0; }
.gp-cell { position: relative; display: grid; place-items: center; height: 38px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg3); color: var(--mute); text-decoration: none; transition: border-color .2s, color .2s, background .2s, translate .2s; }
a.gp-cell:hover { border-color: var(--line2); color: var(--ink); translate: 0 -2px; }
.gp-n { font: 500 12px/1 var(--mono); }
.gp-day.done .gp-cell { border-color: color-mix(in srgb, var(--wc) 35%, transparent); background: color-mix(in srgb, var(--wc) 16%, var(--bg3)); color: var(--wc); }
.gp-day.cur .gp-cell { border-color: var(--wc); background: color-mix(in srgb, var(--wc) 24%, var(--bg3)); color: var(--ink); box-shadow: 0 0 0 3px color-mix(in srgb, var(--wc) 18%, transparent); }
.gp-day.cur .gp-n { font-weight: 600; }
.gp-day.soon:not(.cur) .gp-cell { border-style: dashed; background: transparent; opacity: .6; }
.gp-cap { min-height: 1.5em; margin: 14px 0 0; color: var(--ink); font-size: 15px; line-height: 1.5; }
.gp-cap b { margin-right: 4px; color: var(--mute); font-weight: 500; }
.gp-cap.other b { color: var(--ink2); }
.lesson-hero .game-progress { margin: 22px 0 18px; }

.day-nav { display: flex; flex-direction: column; gap: 12px; margin: 36px 0 10px; }
.day-nav[hidden] { display: none; }
.next-lesson {
  --c: var(--amber); position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 22px; margin: 34px 0 10px; padding: 24px 24px 24px 26px;
  overflow: hidden; border: 1px solid var(--line); border-radius: var(--r); background: linear-gradient(110deg, color-mix(in srgb, var(--c) 9%, transparent), transparent 55%), var(--bg2);
  color: var(--ink); text-decoration: none; transition: border-color .3s, translate .3s;
}
.day-nav .next-lesson { margin: 0; }
a.next-lesson:hover { border-color: color-mix(in srgb, var(--c) 45%, transparent); color: var(--ink); translate: 0 -2px; }
.next-lesson .n { color: var(--c); font: 800 52px/1 var(--sans); letter-spacing: -.05em; }
.next-lesson .t { min-width: 0; }
.next-lesson .t small { display: flex; align-items: center; gap: 9px; margin-bottom: 6px; color: var(--mute); font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.next-lesson .t b { display: block; font-size: 22px; font-weight: 700; line-height: 1.2; letter-spacing: -.025em; }
.next-lesson .dn-got { display: block; margin-top: 6px; color: var(--ink2); font: 400 15px/1.45 var(--sans); }
.next-lesson .ar { display: grid; place-items: center; width: 46px; height: 46px; border: 1px solid var(--line2); border-radius: 50%; color: var(--ink); font: 500 18px/1 var(--sans); transition: background .2s, color .2s, border-color .2s, translate .2s; }
a.next-lesson:hover .ar { border-color: var(--ink); background: var(--ink); color: var(--bg); translate: 3px 0; }
.next-lesson.soon { cursor: default; border-style: dashed; background: transparent; }
.next-lesson.soon .n, .next-lesson.soon .ar { color: var(--mute); }
.dn-prev { display: inline-flex; flex-wrap: wrap; align-self: flex-start; align-items: baseline; gap: 2px 10px; padding: 6px 4px; color: var(--mute); font-size: 15px; line-height: 1.35; text-decoration: none; }
.dn-prev .ar { font: 500 15px/1 var(--sans); transition: translate .2s; }
.dn-prev small { font: 500 11px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.dn-prev b { color: var(--ink2); font-weight: 500; }
a.dn-prev:hover b { color: var(--ink); }
a.dn-prev:hover .ar { translate: -3px 0; color: var(--ink); }
.dn-prev.soon { opacity: .7; }

/* ================= Служебные страницы: приёмы, словарь, промпты, шаблоны, тетрадь, сертификат (pages.js) ================= */
.page { width: min(1200px, 100% - 48px); margin: 0 auto; padding: 0 0 110px; }
.subhero { position: relative; padding: 64px 0 22px; }
.subhero h1 { margin: 18px 0 16px; font-size: clamp(40px, 5.4vw, 68px); letter-spacing: -.05em; line-height: .98; }
.subhero .lead { max-width: 62ch; margin: 0; }
.filters { display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 0; }
.filters + .filters { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.filters button { height: 36px; padding: 0 14px; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--ink2); cursor: pointer; font: 500 14px/1 var(--sans); white-space: nowrap; transition: border-color .2s, color .2s, background .2s; }
.filters button:hover:not(.on) { border-color: var(--line2); color: var(--ink); }
.filters button.on { border-color: var(--ink); background: var(--ink); color: var(--bg); }
.searchbox, .field {
  display: block; width: 100%; height: 50px; margin: 22px 0 14px; padding: 0 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg2);
  color: var(--ink); font: 400 16px/1 var(--sans); outline: none; transition: border-color .2s, box-shadow .2s;
}
.searchbox { padding-left: 46px; background: var(--bg2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238f8e95' stroke-width='1.8' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='6.5'/%3E%3Cpath d='m16 16 4 4'/%3E%3C/svg%3E") 16px 50% / 20px 20px no-repeat; }
.searchbox::placeholder, .field::placeholder { color: var(--mute); }
.searchbox:focus, .field:focus { border-color: var(--line2); box-shadow: 0 0 0 3px rgba(255, 255, 255, .05); }
.searchbox::-webkit-search-cancel-button { filter: invert(.6); }
#count { margin: 0 0 18px; font: 400 12.5px/1.4 var(--mono); }

/* карточки приёмов */
.techs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 20px 0 24px; }
.techs.tech-lib { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 0; }
.tech { display: flex; flex-direction: column; gap: 8px; padding: 20px 20px 18px; border: 1px solid var(--line); border-radius: 16px; background: var(--bg2); color: var(--ink2); font-size: 15px; line-height: 1.55; transition: border-color .25s, translate .25s; }
.tech-lib .tech:hover { border-color: var(--line2); translate: 0 -2px; }
.tech > b:first-child, .tech .tn { color: var(--ink); font: 700 18px/1.25 var(--sans); letter-spacing: -.02em; }
.tech .tt { display: flex; flex-wrap: wrap; gap: 4px; }
.tech .tt span { padding: 4px 8px; border: 1px solid var(--line); border-radius: 999px; color: var(--mute); font: 500 10.5px/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.tech .tt span:first-child { border-color: color-mix(in srgb, var(--amber) 35%, transparent); background: var(--amber-soft); color: var(--amber); }
.tech p { margin: 0; }
.tech .nums, .tech .seen, .tech .ask { font-size: 14px; }
.tech .nums::before, .tech .seen::before, .tech .ask::before { content: attr(data-l); display: block; margin-bottom: 3px; color: var(--mute); font: 500 10.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.tech .nums { color: var(--amber); font-family: var(--mono); font-size: 13.5px; }
.tech .ask { padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--code); color: var(--code-ink); font: 400 13.5px/1.55 var(--mono); }
.tech .ask::before { color: var(--sage); }
.tech .src a { overflow-wrap: anywhere; text-decoration-color: var(--line2); }
.tech .tl-lesson { margin-top: auto; padding-top: 8px; color: var(--mute); font: 500 12px/1.3 var(--mono); text-decoration: none; }
.tech a.tl-lesson:hover { color: var(--ink); }

/* словарь */
.gloss { display: grid; border-top: 1px solid var(--line); }
.gloss .gi { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.gloss .gi b { color: var(--ink); font-size: 17px; font-weight: 600; letter-spacing: -.01em; }
.gloss .gi span { color: var(--ink2); }
.gloss .gi a { margin-left: 4px; color: var(--mute); font: 500 12px var(--mono); text-decoration-color: var(--line2); white-space: nowrap; }
.gloss .gi a:hover { color: var(--ink); }

/* тетрадь и промпты по дням */
.nb-lesson { margin: 40px 0 14px; font-size: 22px; }
.nb-lesson a { text-decoration-color: var(--line2); }
.nb-item { --c: var(--amber); margin: 10px 0 14px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg2); }
.nb-item pre { margin: 10px 0 0; color: var(--ink); font: 400 15px/1.6 var(--sans); white-space: pre-wrap; }
.nb-empty { color: var(--mute); }
p.nb-empty { margin: 22px 0 0; padding: 26px 24px; border: 1px dashed var(--line2); border-radius: var(--r-sm); background: var(--bg2); text-align: center; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.nb-actions { margin: 26px 0 8px; }

/* шаблоны документов */
details.tpl { margin: 12px 0; border: 1px solid var(--line); border-radius: 16px; background: var(--bg2); transition: border-color .2s; }
details.tpl:hover, details.tpl[open] { border-color: var(--line2); }
details.tpl summary { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; padding: 16px 20px; cursor: pointer; list-style: none; }
details.tpl summary::-webkit-details-marker { display: none; }
details.tpl summary::after { content: ""; grid-row: 1 / span 2; grid-column: 2; align-self: center; width: 9px; height: 9px; margin: -4px 4px 0 0; border-right: 1.5px solid var(--mute); border-bottom: 1.5px solid var(--mute); rotate: 45deg; transition: rotate .25s, margin .25s; }
details.tpl[open] summary::after { rotate: 225deg; margin-top: 4px; }
details.tpl summary b { color: var(--ink); font: 500 15px/1.35 var(--mono); }
details.tpl summary span { color: var(--mute); font-size: 14px; }
details.tpl[open] summary { border-bottom: 1px solid var(--line); }
details.tpl .tpl-actions { display: flex; gap: 8px; padding: 14px 20px 0; }
details.tpl pre.code { max-height: 520px; margin: 14px 20px 20px; overflow: auto; }

/* сертификат */
.cert-status { --c: var(--amber); margin: 26px 0 18px; }
.cert-status.ready { --c: var(--sage); }
.cert-status ul { columns: 2; column-gap: 32px; margin: 10px 0 0; }
.cert-status li { break-inside: avoid; margin: 0; padding: 4px 0; }
.cert-status .pct { margin-left: 6px; color: var(--mute); font: 400 12.5px var(--mono); }
.cert-form { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 0 0 18px; }
.cert-form label { display: grid; gap: 7px; color: var(--mute); font: 500 11.5px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.cert-form .field { margin: 0; text-transform: none; letter-spacing: 0; }
.cert-frame { position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: var(--r); background: var(--bg2); box-shadow: 0 50px 100px -60px rgba(0, 0, 0, .9); }
.cert-frame canvas { display: block; width: 100%; height: auto; }
.cert-acts { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 18px; }
.cert-acts .muted { font-size: 14px; }

/* ================= Движение ================= */
@keyframes fade-up { from { opacity: 0; translate: 0 6px; } }
@keyframes flash-red { 0% { background-color: rgba(255, 107, 87, .22); } 100% { background-color: var(--bg3); } }
@keyframes up { from { opacity: 0; translate: 0 18px; } to { opacity: 1; translate: 0 0; } }
@media (prefers-reduced-motion: no-preference) {
  .lesson-hero > *, .subhero > * { animation: up .7s cubic-bezier(.2, .7, .2, 1) both; }
  .lesson-hero > :nth-child(2), .subhero > :nth-child(2) { animation-delay: .06s; }
  .lesson-hero > :nth-child(3), .subhero > :nth-child(3) { animation-delay: .1s; }
  .lesson-hero > :nth-child(n + 4) { animation-delay: .14s; }
  .art-glow { animation: glow-in 1.6s .2s ease both; }
  @supports (animation-timeline: view()) {
    .step > .quiz, .step > .sort, .step > .order, .step > .task, .step > .test, .step > .homework, .step > .demo-wrap, .step > .by-track,
    .step > .compare, .step > .grid, .step > .summary, .step > .game-progress, .step > .day-nav, .step > figure:not(.video-insert), .tech-lib .tech {
      animation: up linear both; animation-timeline: view(); animation-range: entry 0% cover 16%;
    }
  }
}
@keyframes glow-in { from { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ================= Адаптив ================= */
@media (max-width: 1100px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .toc { position: fixed; left: 0; top: var(--head); bottom: 0; z-index: 45; width: min(340px, 88vw); height: auto; align-self: stretch; border-right: 1px solid var(--line2); box-shadow: var(--shadow); translate: -105% 0; transition: translate .28s cubic-bezier(.2, .7, .2, 1); }
  body.toc-open .toc { translate: 0 0; }
  body.toc-open::after { content: ""; position: fixed; inset: var(--head) 0 0; z-index: 44; background: rgba(8, 8, 10, .6); -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px); }
  .topbar .menu-btn { display: inline-flex; }
  .techs.tech-lib { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 1000px) {
  .topbar .crumb-now, .topbar .crumb:not(.c2) { display: none; }
}
@media (max-width: 880px) {
  .topbar .tb .txt { display: none; }
  .topbar .tb { padding: 0 9px; }
  .topbar .track-btn { padding: 0 4px; }
  .topbar .track-btn.none { padding: 0 9px; }
  .topbar .tb .caret { display: none; }
  .cert-form { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  :root { --head: 60px; }
  .topbar { gap: 8px; padding: 0 12px; }
  .topbar .brand span { display: none; }
  .topbar .crumb.c2 { display: none; }
  .topbar .where { font-size: 14px; }
  .tb-nav { gap: 0; }
  .lang a { padding: 4px 7px; }
  .tb-pop { position: fixed; left: 12px; right: 12px; top: calc(var(--head) + 6px); min-width: 0; }
  main.lesson { padding: 24px 16px 90px; }
  .page { width: calc(100% - 32px); }
  .subhero { padding: 40px 0 14px; }
  h3 { font-size: 20px; }
  .lead { font-size: 17.5px; }
  .lesson-hero > .art { aspect-ratio: 16 / 9; border-radius: 16px; margin-bottom: 24px; }
  .art-glow { aspect-ratio: 16 / 9; top: 18px; }
  .g2, .g3, .g4, .compare, .roles, .techs, .techs.tech-lib { grid-template-columns: minmax(0, 1fr); }
  .quiz, .sort, .order, .test:not(.badge) { padding: 18px 16px; }
  .quiz .opt { padding: 11px 12px; font-size: 15.5px; }
  .homework > .hh, .homework > .hb, .task > .tb, .task > .th { padding-left: 16px; padding-right: 16px; }
  .by-track > [data-track] { padding: 16px 16px 6px; }
  .by-track > .bt-bar { padding: 10px 12px; }
  .by-track > .bt-hint { padding: 10px 16px 0; }
  .demo-wrap > .dh, .demo-wrap > .dc, .demo-wrap > .dn { padding-left: 14px; padding-right: 14px; }
  .game-progress { padding: 14px 12px 12px; }
  .gp-worlds { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 10px; }
  .gp-cell { height: 36px; }
  .gp-cap { min-height: 3em; font-size: 14.5px; }
  .next-lesson { grid-template-columns: auto minmax(0, 1fr); gap: 16px; padding: 20px 18px; }
  .next-lesson .n { font-size: 40px; }
  .next-lesson .t b { font-size: 19px; }
  .next-lesson .ar { display: none; }
  .loadout { padding: 14px 14px 10px; }
  .loadout .os-pick, .loadout .lo-row { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .loadout .choice.seg, .choice.seg:has(> button > small) { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; }
  .os-pick .seg { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); width: 100%; }
  .os-pick .seg button { padding: 0 8px; }
  .loadout .choice.seg > button, .choice.seg > button:has(> small) { padding: 8px 12px; }
  .gloss .gi { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .filters { flex-wrap: nowrap; overflow-x: auto; margin-inline: -16px; padding-inline: 16px; scrollbar-width: none; overscroll-behavior-x: contain; }
  .filters::-webkit-scrollbar { display: none; }
  .filters button { flex: none; }
  .filters + .filters { border-top: 0; padding-top: 0; margin-top: 8px; }
  .cert-status ul { columns: 1; }
}
@media (max-width: 480px) {
  .topbar .where { display: none; }
}

/* ================= Печать ================= */
@media print {
  :root { --bg: #fff; --band: #fff; --bg2: #fff; --bg3: #f4f4f2; --bg4: #ebebe8; --line: #dcdcd8; --line2: #b9b9b4; --ink: #111214; --ink2: #34343a; --mute: #6b6a72; --code: #f6f6f3; --code-ink: #111214; --code-mute: #6b6a72; }
  .topbar, .toc, .step-done-row, .copy-btn, .art-glow, .day-nav, .bt-bar, .bt-hint { display: none !important; }
  .layout { display: block; }
  body { background: #fff; color: #111; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
/* сертификат печатается один, на весь лист A4 альбомом (@page ставит pages.js) */
@media print {
  body[data-page="certificate"] .subhero, body[data-page="certificate"] .cert-status, body[data-page="certificate"] .cert-form, body[data-page="certificate"] .cert-acts { display: none !important; }
  html:has(body[data-page="certificate"]), body[data-page="certificate"] { height: 210mm; overflow: hidden; }
  body[data-page="certificate"] .page { width: auto; margin: 0; padding: 0; }
  body[data-page="certificate"] .cert-frame { border: 0; border-radius: 0; box-shadow: none; background: none; }
  body[data-page="certificate"] .cert-frame canvas { width: 297mm; height: 210mm; }
}