/* Quasar — страница о движке. Цвета, шрифты и формы — из brand/avr.css */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; background: var(--background); color: var(--on-background); font-family: var(--font); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
code, pre { font-family: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace; }
code { font-size: .9em; padding: 1px 6px; border-radius: 6px; background: var(--surface-high); }
.muted { color: var(--on-surface-variant); }
.small { font-size: 13.5px; }

/* шапка */
.bar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 14px; padding: 12px clamp(16px, 4vw, 40px);
  background: color-mix(in oklab, var(--background) 82%, transparent); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
.logo { display: inline-flex; align-items: center; gap: 10px; margin-right: auto; text-decoration: none; font: 650 17px/1 var(--font); }
.logo .avr-star { width: 20px; height: 20px; }
.bar-nav { display: flex; gap: 4px; }
.bar-nav a { padding: 8px 14px; border-radius: var(--r-full); text-decoration: none; font: 600 14px/20px var(--font); color: var(--on-surface-variant);
  transition: background .2s, border-radius .3s var(--ease-spring); }
.bar-nav a:hover { background: var(--surface-high); border-radius: 12px; color: var(--on-surface); }

.pill { display: inline-flex; align-items: center; justify-content: center; height: 40px; padding: 0 20px; border-radius: var(--r-full);
  background: var(--primary); color: var(--on-primary); text-decoration: none; font: 650 14px/1 var(--font); border: 0; cursor: pointer;
  transition: border-radius .3s var(--ease-spring), transform .2s var(--ease-spring); }
.pill:hover { border-radius: 14px; }
.pill:active { transform: scale(.96); }
.pill.big { height: 52px; padding: 0 26px; font-size: 15.5px; }
.pill.tonal { background: var(--secondary-container); color: var(--on-secondary-container); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

main { padding: 0 clamp(18px, 5vw, 64px); }
.kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0; font: 620 13px/1 var(--font); letter-spacing: .12em; color: var(--primary); }
.kicker .avr-star { width: 14px; height: 14px; }

/* первый экран: текст слева, живой фрактал справа */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); align-items: center; gap: clamp(24px, 4vw, 64px);
  max-width: 1280px; margin: 0 auto; min-height: calc(100svh - 64px); padding: 24px 0 48px; }
.hero-text { display: grid; gap: 22px; }
.hero h1 { margin: 0; font: 760 clamp(64px, 11vw, 148px)/.9 var(--font); letter-spacing: -.035em; font-stretch: 112%; }
.lead { margin: 0; max-width: 540px; font: 430 clamp(16.5px, 1.6vw, 19px)/1.55 var(--font); color: var(--on-surface-variant); }
.hero-view { position: relative; margin: 0; aspect-ratio: 1; border-radius: 36px; overflow: hidden; background: var(--surface-lowest); }
.hero-view canvas { display: block; width: 100%; height: 100%; opacity: 0; transition: opacity 1.2s ease; cursor: grab; touch-action: none; }
.hero-view canvas.on { opacity: 1; }
.hero-view canvas:active { cursor: grabbing; }
.hero-view figcaption { position: absolute; left: 14px; right: 14px; bottom: 14px; display: flex; align-items: center; gap: 10px; padding: 6px 6px 6px 16px;
  border-radius: var(--r-full); background: color-mix(in oklab, var(--surface-high) 82%, transparent); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  font: 600 13px/1.2 var(--font); }
.hero-view figcaption span { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.icon { flex: none; display: grid; place-items: center; width: 36px; height: 36px; border: 0; border-radius: var(--r-full); cursor: pointer;
  background: var(--secondary-container); color: var(--on-secondary-container); transition: border-radius .25s var(--ease-spring); }
.icon:hover { border-radius: 12px; }
.icon svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.why { max-width: 760px; margin: 0 auto 40px; }
.why p { margin: 0; font: 450 clamp(18px, 2vw, 22px)/1.5 var(--font); }

/* цифры */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; max-width: 1080px; margin: 0 auto 72px; }
.stats div { display: grid; gap: 8px; align-content: start; padding: 22px 24px; border-radius: var(--r-xl); background: var(--surface-low);
  transition: border-radius .3s var(--ease-spring), background .2s; }
.stats div:hover { border-radius: 18px; background: var(--surface-mid); }
.stats b { font: 760 clamp(34px, 4vw, 46px)/1 var(--font); letter-spacing: -.02em; color: var(--primary); }
.stats sup { font-size: .5em; }
.stats span { font: 480 14.5px/1.45 var(--font); color: var(--on-surface-variant); }

/* главы */
.chapter { position: relative; display: grid; gap: 16px; max-width: 760px; margin: 0 auto; padding: 56px 0 8px; }
.chapter + .chapter { border-top: 1px solid var(--outline-variant); }
.no { justify-self: start; display: inline-flex; align-items: center; gap: 8px; font: 650 13px/1 var(--font); letter-spacing: .14em; color: var(--tertiary, var(--primary)); }
.no::before { content: ""; width: 14px; height: 14px; background: currentColor; -webkit-mask: var(--avr-star) center / contain no-repeat; mask: var(--avr-star) center / contain no-repeat; }
.chapter h2 { margin: 0; font: 720 clamp(28px, 3.6vw, 40px)/1.12 var(--font); letter-spacing: -.015em; }
.chapter p, .chapter li { margin: 0; font: 430 17px/1.65 var(--font); }
.chapter p b, .chapter li b { font-weight: 680; }
dfn { font-style: normal; font-weight: 680; color: var(--primary); }
pre { margin: 0; overflow-x: auto; }
pre.math { padding: 18px 22px; border-radius: var(--r-lg); background: var(--surface-low); font: 500 16px/1.75 var(--font); font-variant-numeric: tabular-nums; white-space: pre-wrap; }
pre.code { padding: 18px 22px; border-radius: var(--r-lg); background: var(--surface-lowest); font-size: 14px; line-height: 1.7; color: var(--on-surface); }
pre.code.small { font-size: 12.5px; padding: 14px 16px; }
.facts { display: grid; gap: 10px; padding: 0; list-style: none; }
.facts li { padding: 14px 18px; border-radius: var(--r-lg); background: var(--surface-low); }

/* живая схема трассировки */
.demo { margin: 8px 0; display: grid; gap: 10px; }
.demo canvas { width: 100%; height: auto; aspect-ratio: 16 / 9; border-radius: var(--r-xl); background: var(--surface-lowest); cursor: crosshair; touch-action: none; }
.demo figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font: 560 14px/1.3 var(--font); }
#march-info { color: var(--primary); }

/* таблица */
.table-wrap { overflow-x: auto; border-radius: var(--r-xl); background: var(--surface-low); }
table { width: 100%; border-collapse: collapse; font: 450 15px/1.45 var(--font); }
th, td { padding: 13px 18px; text-align: left; vertical-align: top; }
thead th { font: 650 13px/1 var(--font); letter-spacing: .08em; text-transform: lowercase; color: var(--on-surface-variant); padding-top: 18px; }
tbody th { font-weight: 650; color: var(--on-surface-variant); white-space: nowrap; }
tbody tr + tr { border-top: 1px solid var(--outline-variant); }

/* скачать */
.download { max-width: 1080px; margin: 72px auto 48px; }
.dl-card { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: clamp(20px, 3vw, 40px); padding: clamp(24px, 4vw, 44px);
  border-radius: 36px; background: var(--surface-low); }
.dl-text, .dl-side { display: grid; gap: 16px; align-content: start; }
.dl-card h2 { margin: 0; font: 740 clamp(30px, 4vw, 46px)/1.05 var(--font); letter-spacing: -.02em; }
.dl-card p { margin: 0; font: 430 16.5px/1.6 var(--font); }
.req { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none; font: 480 15px/1.45 var(--font); color: var(--on-surface-variant); }
.req li { display: flex; gap: 10px; }
.req li::before { content: ""; flex: none; width: 12px; height: 12px; margin-top: 5px; background: var(--primary); -webkit-mask: var(--avr-star) center / contain no-repeat; mask: var(--avr-star) center / contain no-repeat; }

.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; max-width: 1080px; margin: 0 auto; padding: 28px clamp(18px, 5vw, 64px) 40px;
  font: 520 14px/1 var(--font); color: var(--on-surface-variant); }
.foot span { display: inline-flex; align-items: center; gap: 8px; }
.foot .avr-star { width: 14px; height: 14px; }
.foot a { text-decoration: none; }
.foot a:hover { color: var(--on-surface); }

@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr); min-height: 0; padding-top: 32px; }
  .hero-view { max-width: 520px; width: 100%; justify-self: center; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dl-card { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 760px) { .bar-nav { display: none; } }
@media (max-width: 480px) { .stats { grid-template-columns: minmax(0, 1fr); } .chapter p, .chapter li { font-size: 16px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .hero-view canvas { transition: none; } }