/* theory.css — общие стили страниц теории СУПРЕМУМ.
 * Собран автоматически: tools\theory_css\theory_css.py build
 * Источник канона — canon.json (порог: правило не реже чем в 15% из 512 страниц).
 * Руками не правим значения вслепую: страницы могут нести inline-override,
 * который идёт после <link> и перебивает этот файл. */

:root {
  --accent: #6d28d9;
  --bg: var(--bg-base);
  --bg-base: #c7d2fe;
  --border: var(--glass-border);
  --c-base: #1e293b;
  --c-blue: #2563eb;
  --c-dashed: #94a3b8;
  --c-green: #16a34a;
  --c-orange: #d97706;
  --c-purple: #7c3aed;
  --c-red: #dc2626;
  --c-teal: #0d9488;
  --card: var(--glass-bg);
  --def-bg: rgba(5,150,105,.1);
  --def-border: #059669;
  --ease-out: cubic-bezier(.16,1,.3,1);
  --exmp-bg: rgba(37,99,235,.1);
  --exmp-border: #2563eb;
  --f-blue: rgba(219,234,254,0.85);
  --f-green: rgba(220,252,231,0.85);
  --f-orange: rgba(254,243,199,0.85);
  --f-purple: rgba(237,233,254,0.85);
  --f-red: rgba(254,226,226,0.85);
  --glass-bg: rgba(255,255,255,.5);
  --glass-border: rgba(255,255,255,.75);
  --glass-shadow: 0 8px 40px rgba(30,27,75,.12);
  --glass-strong: rgba(255,255,255,.72);
  --glow-1: rgba(244,114,182,.55);
  --glow-2: rgba(56,189,248,.6);
  --glow-3: rgba(167,139,250,.55);
  --gray: #6366a3;
  --hdr: 64px;
  --memo-bg: rgba(217,119,6,.1);
  --memo-border: #d97706;
  --mist-bg: rgba(220,38,38,.08);
  --mist-border: #dc2626;
  --mistake-bg: rgba(220,38,38,.1);
  --mistake-border: #dc2626;
  --muted: #94a3b8;
  --open-pt-fill: #f8fafc;
  --radius-lg: 1rem;
  --radius-md: .75rem;
  --radius-sm: .5rem;
  --radius-xl: 1.375rem;
  --ring: var(--accent);
  --shadow-lg: 0 12px 32px rgba(30,27,75,.16),0 4px 8px rgba(30,27,75,.06);
  --shadow-md: 0 4px 12px rgba(30,27,75,.10),0 2px 4px rgba(30,27,75,.06);
  --shadow-sm: 0 1px 3px rgba(30,27,75,.08),0 1px 2px rgba(30,27,75,.05);
  --text: #1e1b4b;
  --text-lh: 1.7;
  --text-soft: #3730a3;
  --tile-bg: rgba(255,255,255,.65);
  --viz-bg: rgba(255,255,255,.55);
}
[data-theme="dark"] {
  --accent: #a78bfa;
  --bg: var(--bg-base);
  --bg-base: #0b1023;
  --border: var(--glass-border);
  --c-base: #cbd5e1;
  --c-blue: #60a5fa;
  --c-dashed: #475569;
  --c-green: #4ade80;
  --c-orange: #fb923c;
  --c-purple: #c084fc;
  --c-red: #f87171;
  --c-teal: #2dd4bf;
  --card: var(--glass-bg);
  --def-bg: rgba(52,211,153,.1);
  --def-border: #34d399;
  --exmp-bg: rgba(96,165,250,.1);
  --exmp-border: #60a5fa;
  --f-blue: rgba(96,165,250,0.18);
  --f-green: rgba(74,222,128,0.15);
  --f-orange: rgba(251,146,60,0.15);
  --f-purple: rgba(192,132,252,0.15);
  --f-red: rgba(248,113,113,0.15);
  --glass-bg: rgba(23,28,54,.55);
  --glass-border: rgba(148,163,184,.22);
  --glass-shadow: 0 8px 40px rgba(0,0,0,.4);
  --glass-strong: rgba(23,28,54,.8);
  --glow-1: rgba(190,24,93,.35);
  --glow-2: rgba(3,105,161,.4);
  --glow-3: rgba(109,40,217,.4);
  --gray: #94a3b8;
  --memo-bg: rgba(251,191,36,.1);
  --memo-border: #fbbf24;
  --mist-bg: rgba(248,113,113,.1);
  --mist-border: #f87171;
  --mistake-bg: rgba(248,113,113,.1);
  --mistake-border: #f87171;
  --muted: #64748b;
  --open-pt-fill: #0f1428;
  --shadow-lg: 0 16px 40px rgba(0,0,0,.5),0 4px 10px rgba(0,0,0,.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,.4),0 2px 4px rgba(0,0,0,.3);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.35),0 1px 2px rgba(0,0,0,.25);
  --text: #e2e8f0;
  --text-soft: #a5b4fc;
  --tile-bg: rgba(30,37,68,.65);
  --viz-bg: rgba(15,20,42,.6);
}
* {
  box-sizing: border-box;
}
a, button {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  font-family: inherit;
}
a:focus-visible, button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg-base),0 0 0 4px var(--ring);
  border-radius: var(--radius-sm);
}
body {
  font-family: 'Segoe UI',system-ui,sans-serif;
  color: var(--text);
  margin: 0;
  padding-top: var(--hdr);
  background: var(--bg-base);
  background-image: radial-gradient(ellipse 50% 60% at 15% 10%,var(--glow-1),transparent),radial-gradient(ellipse 55% 65% at 85% 15%,var(--glow-2),transparent),radial-gradient(ellipse 60% 70% at 50% 95%,var(--glow-3),transparent);
  background-attachment: fixed;
  transition: background .3s,color .3s;
}
header.page-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--hdr);
  z-index: 100;
  background: var(--glass-strong);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--glass-border);
  color: var(--text);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
}
.theme-toggle {
  margin-left: auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--tile-bg);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform .15s;
}
.theme-toggle:hover {
  transform: scale(1.08);
}
.page-split {
  display: block;
}
.theory-col {
  width: 50%;
  box-sizing: border-box;
  padding: 28px 32px 80px;
  min-height: calc(100vh - var(--hdr));
}
.interactive-col {
  position: fixed;
  right: 0;
  top: var(--hdr);
  width: 50%;
  height: calc(100vh - var(--hdr));
  z-index: 50;
  overflow: hidden;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.interactive-col svg, .interactive-col canvas, .interactive-col .viz-block {
  margin: 0 auto;
}
@keyframes cardFadeUp {to { opacity: 1; transform: translateY(0); }}
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 24px 26px;
  margin: 20px 0;
  color: var(--text);
  opacity: 0;
  transform: translateY(10px);
  animation: cardFadeUp .5s var(--ease-out) forwards;
}
.card h1 {
  font-size: 1.55rem;
  margin: 0 0 6px;
}
.card h2 {
  font-size: 1.3rem;
  margin: 0 0 12px;
  color: var(--text-soft);
  line-height: 1.3;
}
.card p, .card li, .definition, .highlight, .memo, .mistake {
  line-height: var(--text-lh);
}
.katex {
  font-size: 1.08em;
  vertical-align: middle;
}
.card p:has(> .katex-display:only-child) {
  text-align: center;
}
.katex-display {
  text-align: center;
  text-align-last: center;
}
.katex-display .katex {
  font-size: 1.25em;
}
.card p:has(> .katex:only-child), .card p:has(> .katex-display:only-child), .card li:has(> .katex:only-child), .definition:has(> .katex-display:only-child), .highlight:has(> .katex-display:only-child), .memo:has(> .katex-display:only-child), .mistake:has(> .katex-display:only-child) {
  text-align: center !important;
  text-align-last: center !important;
}
@keyframes fadeIn {from { opacity:0; } to { opacity:1; }}
@keyframes drawStroke {to { stroke-dashoffset: 0; }}
@keyframes fadeScaleIn {from { opacity:0; transform:scale(0.6); } to { opacity:1; transform:scale(1); }}
.card p:has(> .katex:only-child), .card p:has(> .katex-display:only-child), .card li:has(> .katex:only-child), .definition:has(> .katex:only-child), .definition:has(> .katex-display:only-child), .highlight:has(> .katex:only-child), .highlight:has(> .katex-display:only-child), .memo:has(> .katex:only-child), .memo:has(> .katex-display:only-child), .mistake:has(> .katex:only-child), .mistake:has(> .katex-display:only-child) {
  text-align: center !important;
  text-align-last: center !important;
}
.definition, .highlight, .memo, .mistake {
  gap: 12px;
  align-items: flex-start;
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin: 20px 0;
  border: 1px solid transparent;
  color: var(--text);
  transition: background .3s,border-color .3s;
}
.definition {
  background: var(--def-bg);
  border-color: rgba(5,150,105,.25);
}
.highlight {
  background: var(--exmp-bg);
  border-color: rgba(37,99,235,.25);
}
.memo {
  background: var(--memo-bg);
  border-color: rgba(217,119,6,.25);
}
.mistake {
  background: var(--mist-bg);
  border-color: rgba(220,38,38,.25);
}
[data-theme="dark"] .mistake {
  background: rgba(248,113,113,.1);
  border-left-color: #f87171;
}
.definition .a-icon, .highlight .a-icon, .memo .a-icon, .mistake .a-icon {
  font-size: 1.05rem;
  line-height: 1.5;
  flex-shrink: 0;
}
.proof-step.step-visible {
  opacity: 1;
  transform: translateY(0);
}
.definition .a-body, .highlight .a-body, .memo .a-body, .mistake .a-body {
  font-size: .96rem;
  line-height: 1.55;
}
.proof-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--glass-border);
}
.btn {
  --h: 2.35rem;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: .88rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .18s,color .18s,border-color .18s,transform .12s var(--ease-out),box-shadow .18s;
}
.hl:hover {
  background: #fef3c7;
}
.definition .a-title, .highlight .a-title, .memo .a-title, .mistake .a-title {
  font-weight: 700;
  margin-bottom: 2px;
}
.btn:active {
  transform: scale(.96);
}
[data-theme="dark"] .hl:hover {
  background: rgba(251,191,36,.25);
}
.proof-step:last-child {
  border-bottom: none;
}
.btn:disabled {
  opacity: .55;
  cursor: default;
  transform: none !important;
}
.proof-step .num {
  background: var(--c-blue);
  color: white;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  font-size: .9rem;
}
.hl {
  cursor: pointer;
  border-bottom: 1.5px dashed #d97706;
  transition: background .1s;
}
.btn-outline {
  background: var(--glass-strong);
  color: var(--text);
  border-color: var(--glass-border);
}
.btn-outline:hover:not(:disabled) {
  background: var(--tile-bg);
  border-color: var(--accent);
}
.proof-step .txt {
  font-size: .96rem;
  line-height: 1.55;
}
.viz-inner {
  padding: 22px 22px 8px;
}
.step-btn:hover {
  background: var(--glass-strong);
  border-color: var(--accent);
}
.btn-outline.active, .btn-outline.active:hover:not(:disabled) {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.viz-block {
  background: var(--viz-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin: 24px 0;
  user-select: none;
  -webkit-user-select: none;
}
.tab-btn {
  background: var(--tile-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: .84rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  transition: all .15s var(--ease-out);
}
.tab-btn:hover {
  background: var(--glass-strong);
  border-color: var(--accent);
}
.viz-block canvas, .viz-block svg {
  touch-action: none;
  margin: 0 auto;
}
.btn-sm {
  --h: 1.95rem;
  padding: 0 12px;
  font-size: .8rem;
}
.tab-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.viz-caption {
  padding: 10px 18px;
  font-size: 0.88rem;
  color: var(--gray);
  text-align: center;
  border-top: 1px solid var(--glass-border);
  background: var(--glass-bg);
}
.step-btn {
  --h: 2.1rem;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: .85rem;
  cursor: pointer;
  border: 1px solid var(--glass-border);
  background: var(--accent);
  color: white;
  transition: background .2s ease,opacity .2s ease,transform .12s var(--ease-out);
}
.step-btn:disabled {
  opacity: .55;
  cursor: default;
}
.tab-row {
  gap: 8px;
  justify-content: center;
  padding: 10px 14px 0;
}
.formula-box {
  padding: 10px 18px;
  font-size: .92rem;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 1.4em;
  transition: color .2s;
}
.formula-box b {
  color: var(--accent);
}
.step-btn:active {
  transform: scale(.96);
}
.status-badge {
  display: inline-block;
  margin-top: 6px;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
}
.slider-row span.lbl {
  font-size: .85rem;
  color: var(--gray);
}
.slider-row {
  align-items: center;
  gap: 10px;
  padding: 10px 18px 0;
}
.slider-row span.val {
  font-size: .9rem;
  font-weight: 600;
  text-align: right;
  color: var(--text);
}
.viz-block svg circle, .viz-block svg line, .viz-block svg text, .viz-block svg rect, .viz-block svg polyline, .viz-block svg path {
  transition: stroke .2s ease,fill .2s ease,stroke-width .2s ease,opacity .2s ease;
}
.slider-row input[type=range] {
  accent-color: var(--accent);
}
.topic-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: 12px;
  margin-top: 48px;
}
.topic-nav-side {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  min-width: 0;
  overflow: hidden;
  width: fit-content;
  max-width: 100%;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  box-shadow: var(--shadow-sm);
  transition: transform .15s var(--ease-out),background .15s,box-shadow .15s;
}
.draw-in-stroke {
  animation: drawStroke .7s ease forwards;
}
.draw-in-fill {
  transform-box: fill-box;
  transform-origin: center;
  animation: fadeScaleIn .4s ease forwards;
}
.topic-nav-side:hover {
  transform: translateY(-2px);
  background: var(--tile-bg);
  box-shadow: var(--shadow-md);
}
.topic-nav-side:empty {
  background: none;
  border: none;
  padding: 0;
  width: auto;
  box-shadow: none;
}
.draw-in-fade {
  animation: fadeIn .5s ease forwards;
}
.topic-nav-prev {
  text-align: left;
  justify-self: start;
}
.topic-nav-next {
  text-align: right;
  justify-self: end;
}
.viz-block svg circle {
  transition: fill .2s ease,opacity .2s ease;
}
.topic-nav-meta {
  font-size: .8rem;
  color: var(--gray);
  white-space: nowrap;
}
.topic-nav-title {
  font-size: clamp(.74rem,1.55vw,.98rem);
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: block;
}
.topic-nav-all {
  justify-self: center;
  align-self: center;
  background: var(--accent);
  color: white;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: .92rem;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: transform .15s var(--ease-out),box-shadow .15s;
}
.topic-nav-all:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@media (max-width: 720px) {
  .theory-col {
    width: 100%;
  }
}

@media (min-width: 1200px) {
  .card p, .card li, .definition, .highlight, .memo, .mistake {
    text-align: justify;
    text-align-last: left;
    hyphens: auto;
    -webkit-hyphens: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card {
    opacity: 1;
    transform: none;
  }
  .card, .viz-block svg *, .btn, .hl, .step-btn {
    animation: none !important;
    transition: none !important;
  }
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* Дописывается в конец theory.css при сборке (theory_css.py build).
 * Сюда идут общие компоненты, которых нет ни на одной старой странице,
 * поэтому канон их вывести не может. */

/* Блок предпосылок на странице темы (роудмап, задача 5.5).
 * Ставится первым в theory-col: ученик видит, что нужно знать, до того как начнёт читать. */
.prereq {
  margin: 0 0 18px;
  padding: 12px 16px;
  border-left: 3px solid var(--c-purple, #7c3aed);
  border-radius: var(--radius-md, .75rem);
  /* фиксированная фиолетовая дымка, а не переменная темы: часть страниц
   * переопределяет --f-purple только в одном режиме, и в другом получалось
   * светлое на светлом. Полупрозрачный акцент читается на любом фоне */
  background: rgba(124,58,237,.12);
  color: inherit;
  font-size: .95rem;
  line-height: 1.6;
}
.prereq-title {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
  opacity: .85;
}
.prereq a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--c-purple, #7c3aed);
  text-underline-offset: 3px;
}
.prereq a + a::before {
  content: " · ";
  text-decoration: none;
  opacity: .5;
}
.prereq a:hover {
  text-decoration-thickness: 2px;
}