/* learn.david-monis.com – spoločný vzhľad. Tokeny sú rovnaké ako na david-monis.com. */

/* ---------- písma (lokálne, latin + latin-ext kvôli slovenčine) ---------- */
@font-face { font-family: "Bricolage Grotesque"; font-style: normal; font-weight: 400 800; font-display: swap;
  src: url("/fonts/bricolage-grotesque-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Bricolage Grotesque"; font-style: normal; font-weight: 400 800; font-display: swap;
  src: url("/fonts/bricolage-grotesque-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 400 700; font-display: swap;
  src: url("/fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 400 700; font-display: swap;
  src: url("/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

/* ---------- tokeny ---------- */
:root {
  color-scheme: dark;
  --bg: #07090e;
  --surface: #0e121a;
  --surface-2: #141924;
  --surface-3: #1b2130;
  --line: rgba(255, 255, 255, .07);
  --line-2: rgba(255, 255, 255, .12);
  --text: #eef0f3;
  --text-2: #a9afba;
  --text-3: #727986;
  --accent: #f2a541;
  --accent-hi: #ffbd63;
  --accent-ink: #1b1204;
  /* farby dát – všade v kurze znamenajú to isté */
  --blue: #7fa8ff;    /* kladná váha, vstup, „môj“ signál */
  --red: #ff7a7a;     /* záporná váha, chyba */
  --green: #5ad99a;   /* správne, výstup, cieľ */
  --violet: #b79bff;  /* pozornosť (attention), dopyt */
  --teal: #5fd4d0;    /* doplnková séria */

  --r-sm: 12px;
  --r: 20px;
  --r-lg: 28px;

  --font-display: "Bricolage Grotesque", "Inter", ui-sans-serif, system-ui, sans-serif;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;

  --fs-h1: clamp(2.25rem, 1.3rem + 3.6vw, 4rem);
  --fs-h2: clamp(1.75rem, 1.3rem + 1.7vw, 2.5rem);
  --fs-lead: clamp(1.0625rem, 1rem + .35vw, 1.25rem);

  --pad: clamp(16px, 4vw, 32px);
  --nav-h: 68px;
  --ease: cubic-bezier(.22, .8, .24, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 20px); }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 1rem; line-height: 1.65;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}
img, video, canvas, svg { display: block; max-width: 100%; }
img, video { height: auto; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-weight: 600; letter-spacing: -.03em; line-height: 1.1; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }
figure { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 8px; }
::selection { background: var(--accent); color: var(--accent-ink); }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #232838; border-radius: 6px; border: 3px solid var(--bg); }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ic { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.container { width: min(1200px, 100% - 2 * var(--pad)); margin-inline: auto; }
.skip { position: fixed; left: 16px; top: -60px; z-index: 100; padding: 10px 16px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.skip:focus { top: 12px; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---------- tlačidlá ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 48px; padding: 0 22px; border-radius: 999px; border: 1px solid transparent;
  font: 600 .96875rem/1 var(--font); letter-spacing: -.005em; white-space: nowrap; cursor: pointer;
  transition: background-color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease), box-shadow .3s var(--ease), color .25s;
}
.btn .ic { width: 17px; height: 17px; }
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hi); transform: translateY(-1px); box-shadow: 0 10px 34px -8px rgba(242, 165, 65, .55); }
.btn-ghost { background: rgba(255, 255, 255, .04); border-color: var(--line-2); color: var(--text); }
.btn-ghost:hover { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .2); }
.btn-sm { height: 38px; padding: 0 16px; font-size: .875rem; gap: 8px; }
.btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---------- navigácia ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: 50; height: var(--nav-h); background: rgba(7, 9, 14, .72); -webkit-backdrop-filter: blur(16px) saturate(150%); backdrop-filter: blur(16px) saturate(150%); border-bottom: 1px solid var(--line); }
.nav-inner { height: 100%; width: min(1200px, 100% - 2 * var(--pad)); margin-inline: auto; display: flex; align-items: center; gap: 8px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-family: var(--font-display); font-weight: 600; font-size: 1.125rem; letter-spacing: -.02em; white-space: nowrap; }
.brand-mark { width: 32px; height: 32px; flex: none; transition: transform .5s var(--ease); }
.brand:hover .brand-mark { transform: rotate(-8deg) scale(1.06); }
.brand em { font-style: normal; color: var(--accent-hi); }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav-links a { padding: 8px 14px; border-radius: 999px; color: var(--text-2); font-size: .9375rem; font-weight: 500; transition: color .2s, background-color .2s; }
.nav-links a:hover, .nav-links a[aria-current] { color: var(--text); background: rgba(255, 255, 255, .05); }
.lang { margin-left: 10px; display: inline-grid; place-items: center; height: 36px; min-width: 44px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line-2); font-size: .8125rem; font-weight: 700; letter-spacing: .04em; color: var(--text-2); transition: color .2s, border-color .2s, background-color .2s; }
.lang:hover { color: var(--accent-hi); border-color: rgba(242, 165, 65, .45); background: rgba(242, 165, 65, .08); }
.nav-toggle { display: none; margin-left: 8px; width: 44px; height: 44px; border-radius: 999px; border: 1px solid var(--line-2); background: rgba(255, 255, 255, .04); align-items: center; justify-content: center; cursor: pointer; }
.progress { position: fixed; inset: var(--nav-h) 0 auto; z-index: 49; height: 3px; pointer-events: none; }
.progress i { display: block; height: 100%; width: 100%; transform-origin: 0 50%; transform: scaleX(0); background: linear-gradient(90deg, var(--accent), var(--accent-hi)); }

/* ---------- úvod (katalóg aj prednáška) ---------- */
.hero { position: relative; padding: calc(var(--nav-h) + clamp(40px, 6vw, 88px)) 0 clamp(40px, 5vw, 72px); overflow: hidden; isolation: isolate; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(46% 50% at 78% 0%, rgba(84, 116, 196, .2), transparent 70%),
    radial-gradient(34% 40% at 12% 12%, rgba(242, 165, 65, .12), transparent 70%); }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 25%, transparent 75%); mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 25%, transparent 75%); }
.kicker { display: inline-flex; align-items: center; gap: 10px; padding: 7px 14px; border-radius: 999px; border: 1px solid rgba(242, 165, 65, .28); background: rgba(242, 165, 65, .07); color: var(--accent-hi); font-size: .875rem; font-weight: 600; }
.kicker a:hover { text-decoration: underline; }
.hero h1 { margin-top: 22px; font-size: var(--fs-h1); max-width: 18ch; }
.hero h1 em { font-style: normal; color: var(--accent-hi); }
.lead { margin-top: 20px; max-width: 62ch; font-size: var(--fs-lead); color: var(--text-2); }
.hero-cta { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 12px; }
.meta { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px 26px; color: var(--text-2); font-size: .9375rem; }
.meta li { display: inline-flex; align-items: center; gap: 8px; }
.meta .ic { color: var(--accent); }
.hero-split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: clamp(24px, 4vw, 56px); align-items: center; }
.hero-art { aspect-ratio: 5 / 4; border-radius: var(--r-lg); border: 1px solid var(--line); background: radial-gradient(80% 80% at 50% 40%, rgba(127,168,255,.09), transparent 70%), var(--surface); overflow: hidden; }
.hero-art canvas { width: 100%; height: 100%; }

/* ---------- sekcie katalógu ---------- */
.block { padding: clamp(48px, 7vw, 96px) 0; }
.block-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 16px 32px; margin-bottom: clamp(24px, 3vw, 40px); }
.block-head h2 { font-size: var(--fs-h2); }
.block-head p { max-width: 56ch; color: var(--text-2); }
.card { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.course { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; overflow: hidden; border-radius: var(--r-lg); transition: border-color .3s; }
.course:hover { border-color: var(--line-2); }
.course-copy { padding: clamp(22px, 3vw, 40px); display: flex; flex-direction: column; align-items: flex-start; gap: 16px; }
.course-copy h3 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.125rem); }
.course-copy p { color: var(--text-2); }
.course-art { min-height: 260px; background: radial-gradient(70% 70% at 60% 40%, rgba(242,165,65,.12), transparent 70%), var(--surface-2); border-left: 1px solid var(--line); }
.course-art canvas { width: 100%; height: 100%; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { padding: 4px 11px; border-radius: 999px; border: 1px solid var(--line-2); font-size: .8125rem; color: var(--text-2); font-weight: 500; }
.soon { padding: clamp(22px, 3vw, 32px); border-style: dashed; color: var(--text-2); display: flex; align-items: center; gap: 16px; margin-top: 16px; }
.soon .ic { width: 22px; height: 22px; color: var(--accent); }

/* zoznam prednášok */
.syllabus { display: grid; gap: 12px; counter-reset: lec; }
.part { margin: 28px 0 6px; font: 600 .8125rem/1 var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); }
.part:first-child { margin-top: 0; }
.lec { position: relative; display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; align-items: center; gap: 8px 20px; padding: 20px 24px 20px 20px; transition: border-color .25s, background-color .25s, transform .25s var(--ease); }
a.lec:hover { border-color: rgba(242, 165, 65, .4); background: var(--surface-2); transform: translateY(-2px); }
.lec-n { width: 56px; height: 56px; display: grid; place-items: center; border-radius: 16px; background: var(--surface-3); font: 600 1.375rem/1 var(--font-display); color: var(--accent-hi); }
.lec h3 { font-size: 1.25rem; letter-spacing: -.02em; }
.lec p { margin-top: 5px; color: var(--text-2); font-size: .9375rem; }
.lec-side { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; color: var(--text-3); font-size: .8125rem; white-space: nowrap; }
.lec-state { display: none; align-items: center; gap: 6px; color: var(--green); font-weight: 600; }
.lec.done .lec-state { display: inline-flex; }
.lec.done .lec-n { background: rgba(90, 217, 154, .14); color: var(--green); }
.course-progress { display: flex; align-items: center; gap: 14px; color: var(--text-2); font-size: .9375rem; }
.bar { flex: 1; min-width: 120px; max-width: 280px; height: 8px; border-radius: 99px; background: var(--surface-3); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; border-radius: 99px; background: var(--green); transition: width .6s var(--ease); }

/* ---------- prednáška: rozloženie ---------- */
.l-grid { display: grid; grid-template-columns: 232px minmax(0, 1fr); gap: clamp(28px, 4vw, 64px); align-items: start; padding-bottom: 96px; }
.toc { position: sticky; top: calc(var(--nav-h) + 24px); max-height: calc(100dvh - var(--nav-h) - 48px); overflow: auto; padding-right: 4px; font-size: .875rem; }
.toc-title { font: 600 .75rem/1 var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); margin-bottom: 14px; }
.toc ol { border-left: 1px solid var(--line-2); }
.toc a { display: block; margin-left: -1px; padding: 6px 0 6px 16px; border-left: 2px solid transparent; color: var(--text-3); line-height: 1.35; transition: color .2s, border-color .2s; }
.toc a:hover { color: var(--text); }
.toc a.on { color: var(--accent-hi); border-left-color: var(--accent); }
.prose { max-width: 900px; min-width: 0; }
.prose > section { padding-top: 8px; margin-bottom: clamp(56px, 7vw, 88px); }
.prose > section > * + * { margin-top: 18px; }
.sec-n { display: block; font: 600 .8125rem/1 var(--font-mono); color: var(--accent); margin-bottom: 12px; letter-spacing: .04em; }
.prose h2 { font-size: var(--fs-h2); max-width: 22ch; }
.prose h3 { font-size: 1.375rem; letter-spacing: -.02em; margin-top: 36px !important; }
.prose h4 { font-size: 1.0625rem; letter-spacing: -.01em; margin-top: 26px !important; }
/* :where() drží nízku špecificitu, aby texty vnútri labov a boxov ľahko prebili vlastné triedy */
:where(.prose) :where(p, li) { color: #cfd3db; font-size: 1.0625rem; line-height: 1.72; }
.prose > section > p, .prose > section > ul, .prose > section > ol, .prose > section > h3, .prose > section > h4 { max-width: 70ch; }
.prose strong { color: var(--text); font-weight: 600; }
:where(.prose) em { color: var(--accent-hi); font-style: normal; }
.prose p a, .prose li a, .src a { color: #a9c4ff; border-bottom: 1px solid rgba(169, 196, 255, .3); transition: color .2s, border-color .2s; }
.prose p a:hover, .prose li a:hover, .src a:hover { color: var(--accent-hi); border-bottom-color: var(--accent); }
.prose > section > ul { display: grid; gap: 8px; }
.prose > section > ul > li { position: relative; padding-left: 24px; }
.prose > section > ul > li::before { content: ""; position: absolute; left: 4px; top: .72em; width: 7px; height: 7px; border-radius: 2px; background: var(--accent); }
.prose > section > ol { display: grid; gap: 10px; counter-reset: li; }
.prose > section > ol > li { position: relative; padding-left: 38px; counter-increment: li; }
.prose > section > ol > li::before { content: counter(li); position: absolute; left: 0; top: .2em; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; background: var(--surface-3); color: var(--accent-hi); font: 600 .8125rem/1 var(--font-mono); }
code, .v { font-family: var(--font-mono); font-size: .92em; padding: 1px 6px; border-radius: 6px; background: var(--surface-3); color: #e6e9f0; white-space: nowrap; }
.c-blue { color: var(--blue) !important; } .c-red { color: var(--red) !important; } .c-green { color: var(--green) !important; } .c-amber { color: var(--accent-hi) !important; } .c-violet { color: var(--violet) !important; }

/* vzorec */
.formula { padding: 20px 24px; border-radius: var(--r-sm); border: 1px solid var(--line); background: var(--surface); font-family: var(--font-mono); font-size: clamp(.9375rem, .8rem + .6vw, 1.1875rem); line-height: 1.9; overflow-x: auto; white-space: nowrap; color: #e6e9f0; }
.formula small { display: block; margin-top: 6px; font: 400 .875rem/1.5 var(--font); color: var(--text-3); white-space: normal; }
.formula sub, .formula sup { font-size: .7em; }

/* poznámky */
.note, .key, .paper { position: relative; padding: 20px 22px 20px 24px; border-radius: var(--r-sm); border: 1px solid var(--line); background: var(--surface); }
.note > * + *, .key > * + *, .paper > * + * { margin-top: 10px; }
.note::before, .key::before, .paper::before { content: ""; position: absolute; left: 0; top: 14px; bottom: 14px; width: 3px; border-radius: 3px; background: var(--blue); }
.key { background: rgba(242, 165, 65, .06); border-color: rgba(242, 165, 65, .22); }
.key::before { background: var(--accent); }
.paper::before { background: var(--violet); }
.box-t { font: 600 .75rem/1 var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); }
.key .box-t { color: var(--accent-hi); } .paper .box-t { color: var(--violet); }
.paper blockquote { margin: 0; font-size: 1.0625rem; color: var(--text); font-style: italic; }
.paper cite { display: block; font-style: normal; font-size: .875rem; color: var(--text-3); }

/* obrázok / schéma */
.fig { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); overflow: hidden; }
.fig > svg, .fig > canvas, .fig > video, .fig > img { width: 100%; }
.fig figcaption { padding: 14px 20px; border-top: 1px solid var(--line); color: var(--text-2); font-size: .9375rem; }
.fig svg text { font-family: var(--font); fill: var(--text-2); }

/* tabuľka */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface); }
.tbl { width: 100%; border-collapse: collapse; font-size: .9375rem; }
.tbl th, .tbl td { padding: 11px 16px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tbl th { font-weight: 600; color: var(--text-3); font-size: .8125rem; letter-spacing: .04em; text-transform: uppercase; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl td.num, .tbl th.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.tbl tr.hl td { background: rgba(242, 165, 65, .07); }

/* kroky / dlaždice */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.tile { padding: 18px 20px; border-radius: var(--r-sm); border: 1px solid var(--line); background: var(--surface); }
.tile b { display: block; font: 600 1.0625rem/1.25 var(--font-display); letter-spacing: -.01em; color: var(--text); margin-bottom: 6px; }
.tile p { font-size: .9375rem; line-height: 1.55; color: var(--text-2); }
.tile .big { font: 600 1.75rem/1 var(--font-display); color: var(--accent-hi); margin-bottom: 8px; display: block; }

/* ---------- lab: interaktívna časť ---------- */
.lab { border-radius: var(--r); border: 1px solid var(--line-2); background: linear-gradient(180deg, rgba(127, 168, 255, .05), transparent 140px), var(--surface); overflow: hidden; }
.lab-head { padding: 22px 24px 0; }
.lab-tag { display: inline-flex; align-items: center; gap: 8px; font: 600 .75rem/1 var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--accent-hi); }
.lab-tag::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(242, 165, 65, .18); }
.lab-head h3 { margin-top: 12px !important; font-size: 1.375rem; }
.lab-head p { margin-top: 8px; color: var(--text-2); font-size: .9688rem; line-height: 1.6; max-width: 72ch; }
.lab-body { padding: 20px 24px 24px; min-height: 120px; }
.lab-hint { margin: 0 !important; padding: 14px 24px; border-top: 1px solid var(--line); color: var(--text-2) !important; font-size: .9375rem !important; background: rgba(255, 255, 255, .015); }
.lab-hint b { color: var(--accent-hi); font-weight: 600; }
.lab-row { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.lab-row.even { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.lab-row.tri { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stage { position: relative; border-radius: var(--r-sm); border: 1px solid var(--line); background: #090c13; overflow: hidden; }
.stage svg, .stage canvas { width: 100%; height: auto; touch-action: none; }
.stage svg text { font-family: var(--font); fill: var(--text-2); font-size: 12px; }
.stage svg text.m { font-family: var(--font-mono); }
.stage svg text.halo { paint-order: stroke; stroke: #090c13; stroke-width: 5px; stroke-linejoin: round; }
.ctl-col { display: grid; gap: 14px; align-content: start; }
.ctl { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; font-size: .875rem; color: var(--text-2); }
.ctl output { font-family: var(--font-mono); color: var(--text); font-variant-numeric: tabular-nums; min-width: 5ch; text-align: right; }
.ctl input[type=range] { grid-column: 1 / -1; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 24px; background: transparent; cursor: pointer; margin: 0; --c: var(--accent); }
input[type=range]::-webkit-slider-runnable-track { height: 6px; border-radius: 99px; background: var(--surface-3); }
input[type=range]::-moz-range-track { height: 6px; border-radius: 99px; background: var(--surface-3); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; margin-top: -7px; border-radius: 50%; background: var(--c); border: 3px solid var(--bg); box-shadow: 0 0 0 1px var(--c); }
input[type=range]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--c); border: 3px solid var(--bg); box-shadow: 0 0 0 1px var(--c); }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip { height: 36px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--line-2); background: rgba(255, 255, 255, .03); color: var(--text-2); font: 500 .875rem/1 var(--font); cursor: pointer; transition: color .2s, border-color .2s, background-color .2s; white-space: nowrap; }
.chip:hover { color: var(--text); border-color: rgba(255, 255, 255, .25); }
.chip[aria-pressed=true], .chip.on { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); font-weight: 600; }
.readout { padding: 14px 16px; border-radius: var(--r-sm); background: #090c13; border: 1px solid var(--line); font-family: var(--font-mono); font-size: .875rem; line-height: 1.8; color: var(--text-2); overflow-x: auto; white-space: nowrap; font-variant-numeric: tabular-nums; }
.readout b { color: var(--text); font-weight: 600; }
.stat { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: .875rem; color: var(--text-2); }
.stat:last-child { border-bottom: 0; }
.stat b { font: 600 1.125rem/1 var(--font-mono); color: var(--text); font-variant-numeric: tabular-nums; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: .8125rem; color: var(--text-2); }
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.legend i { width: 10px; height: 10px; border-radius: 3px; background: var(--blue); flex: none; }
.lab-label { font: 600 .75rem/1 var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); margin-bottom: 8px; }
.tip { position: absolute; z-index: 5; pointer-events: none; padding: 6px 10px; border-radius: 8px; background: #1f2636; border: 1px solid var(--line-2); font: 500 .8125rem/1.3 var(--font-mono); color: var(--text); white-space: nowrap; transform: translate(-50%, -130%); opacity: 0; transition: opacity .15s; }
.tip.on { opacity: 1; }

/* ---------- kvíz ---------- */
.quiz { padding: 22px 24px; border-radius: var(--r); border: 1px solid var(--line-2); background: var(--surface); }
.quiz + .quiz { margin-top: 12px !important; }
.quiz-q { font: 600 1.125rem/1.4 var(--font-display) !important; letter-spacing: -.01em; color: var(--text) !important; }
.quiz-opts { margin-top: 14px; display: grid; gap: 8px; }
.quiz-opt { display: flex; align-items: flex-start; gap: 12px; width: 100%; padding: 12px 16px; text-align: left; border-radius: var(--r-sm); border: 1px solid var(--line-2); background: rgba(255, 255, 255, .02); color: #cfd3db; font-size: 1rem; line-height: 1.5; cursor: pointer; transition: border-color .2s, background-color .2s; }
.quiz-opt::before { content: ""; flex: none; width: 18px; height: 18px; margin-top: 3px; border-radius: 50%; border: 2px solid var(--text-3); }
.quiz-opt:hover:not([disabled]) { border-color: rgba(255, 255, 255, .3); background: rgba(255, 255, 255, .05); }
.quiz-opt[disabled] { cursor: default; }
.quiz-opt.right { border-color: rgba(90, 217, 154, .6); background: rgba(90, 217, 154, .09); color: var(--text); }
.quiz-opt.right::before { border-color: var(--green); background: var(--green); }
.quiz-opt.wrong { border-color: rgba(255, 122, 122, .6); background: rgba(255, 122, 122, .08); }
.quiz-opt.wrong::before { border-color: var(--red); background: var(--red); }
.quiz-why { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--text-2) !important; font-size: .9688rem !important; }
.quiz-score { padding: 20px 24px; border-radius: var(--r); background: rgba(90, 217, 154, .07); border: 1px solid rgba(90, 217, 154, .25); display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; }
.quiz-score b { font: 600 1.75rem/1 var(--font-display); color: var(--green); }

/* ---------- záver prednášky ---------- */
.recap { display: grid; gap: 10px; }
.recap li { display: grid; grid-template-columns: 26px 1fr; gap: 12px; align-items: start; padding-left: 0 !important; }
.recap li::before { display: none !important; }
.recap .ic { margin-top: 5px; color: var(--green); }
.finish { padding: clamp(22px, 3vw, 36px); border-radius: var(--r-lg); border: 1px solid rgba(242, 165, 65, .25); background: radial-gradient(60% 120% at 100% 0%, rgba(242, 165, 65, .12), transparent 70%), var(--surface); display: grid; gap: 18px; }
.finish h2 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem); max-width: none; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.pager a { padding: 18px 22px; border-radius: var(--r); border: 1px solid var(--line); background: var(--surface); transition: border-color .25s, transform .25s var(--ease); }
.pager a:hover { border-color: rgba(242, 165, 65, .4); transform: translateY(-2px); }
.pager small { display: block; color: var(--text-3); font-size: .8125rem; margin-bottom: 4px; }
.pager b { font: 600 1.125rem/1.25 var(--font-display); letter-spacing: -.01em; }
.pager .next { text-align: right; grid-column: 2; }
.src { display: grid; gap: 8px; font-size: .9375rem; color: var(--text-2); }
.src li { padding-left: 0 !important; font-size: .9375rem !important; }
.src li::before { display: none !important; }

/* ---------- pätička ---------- */
.footer { border-top: 1px solid var(--line); padding: 48px 0 32px; }
.footer-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 32px 56px; }
.footer-brand p { margin-top: 14px; max-width: 38ch; color: var(--text-2); font-size: .9375rem; }
.footer-cols { display: flex; flex-wrap: wrap; gap: 32px 64px; }
.footer-col { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
.footer-col p { font-size: .8125rem; color: var(--text-3); margin-bottom: 8px; font-weight: 500; }
.footer-col a { color: var(--text-2); font-size: .9375rem; padding: 3px 0; transition: color .2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; font-size: .8125rem; color: var(--text-3); }
.footer-bottom a { color: var(--text-2); }
.footer-bottom a:hover { color: var(--text); }

/* ---------- objavenie pri posúvaní ---------- */
.js .rv { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .rv.in { opacity: 1; transform: none; }

/* ---------- menšie obrazovky ---------- */
@media (max-width: 1020px) {
  .l-grid { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
  .hero-split, .course { grid-template-columns: minmax(0, 1fr); }
  .course-art { border-left: 0; border-top: 1px solid var(--line); min-height: 220px; }
}
@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav-links { position: absolute; inset: var(--nav-h) 0 auto; margin: 0; padding: 12px var(--pad) 20px; flex-direction: column; align-items: stretch; background: rgba(7, 9, 14, .97); border-bottom: 1px solid var(--line); display: none; }
  .nav.open .nav-links { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .lang { margin-left: auto; }
  .lab-row, .lab-row.even, .lab-row.tri { grid-template-columns: minmax(0, 1fr); }
  .lab-head { padding: 18px 16px 0; } .lab-body { padding: 16px; } .lab-hint { padding: 12px 16px; }
  .quiz { padding: 18px 16px; }
  .lec { grid-template-columns: 48px minmax(0, 1fr); padding: 16px; }
  .lec-n { width: 44px; height: 44px; font-size: 1.125rem; border-radius: 12px; }
  .lec-side { grid-column: 2; flex-direction: row; align-items: center; gap: 14px; }
  .pager { grid-template-columns: 1fr; } .pager .next { grid-column: 1; text-align: left; }
  :where(.prose) :where(p, li) { font-size: 1rem; }
  .formula { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .rv { opacity: 1; transform: none; }
}