/* Бюро нотаций – чертёжный стол (синька) и листы на бумаге */
:root {
  --desk: #0c2340;
  --desk-2: #11315a;
  --desk-3: #17406f;
  --grid: rgba(150, 200, 255, .09);
  --grid-major: rgba(150, 200, 255, .16);
  --cyan: #8fd3ff;
  --cyan-2: #c9ecff;
  --paper: #f7f4ec;
  --paper-2: #efeadd;
  --ink: #142238;
  --ink-2: #4b5a72;
  --rule: #c9c1ad;
  --red: #c8432b;
  --amber: #ffb547;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --sans: "IBM Plex Sans", "Segoe UI", Arial, sans-serif;
  --top: 64px;
  --wrap: 1180px;
  --text: 960px;
  --page: 1640px;      /* лист-статья: почти во всю ширину, синие поля – узкие */
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 72px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 400 17px/1.65 var(--sans);
  color: var(--cyan-2);
  background-color: var(--desk);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  background-attachment: fixed;
}
a { color: inherit; }
img, svg { max-width: 100%; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--amber); color: var(--ink); padding: 8px 14px; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }

.kicker {
  font: 500 13px/1.4 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 14px;
}

/* ---------------------------------------------------------------- шапка */
.top {
  position: sticky; top: 0; z-index: 50;
  height: var(--top);
  display: flex; align-items: center; gap: 28px;
  padding: 0 max(24px, calc((100vw - 1720px) / 2 + 24px));
  background: rgba(12, 35, 64, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--grid-major);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; flex: none; }
.brand__mark svg { width: 30px; height: 30px; fill: none; stroke: var(--amber); stroke-width: 2; display: block; }
.brand__name { font: 600 17px/1 var(--sans); color: #fff; letter-spacing: .01em; }
.top__nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; margin-left: auto; }
.top__nav::-webkit-scrollbar { display: none; }
.top__nav a {
  font: 500 14px/1 var(--mono); color: var(--cyan); text-decoration: none; white-space: nowrap;
  padding: 9px 10px; border-radius: 4px; border: 1px solid transparent;
}
.top__nav a:hover { color: #fff; border-color: var(--grid-major); }
.top__nav a[aria-current] { color: var(--ink); background: var(--amber); }
.top__sep { margin-left: 12px; }
.top__bar { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; }
.top__bar i { display: block; height: 100%; width: 100%; transform-origin: 0 50%; transform: scaleX(var(--read, 0)); background: var(--amber); }

/* ---------------------------------------------------------------- кнопки */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 15px/1 var(--mono); text-decoration: none;
  padding: 14px 20px; border: 1.5px solid var(--cyan); border-radius: 4px; color: #fff;
  transition: background .2s, color .2s;
}
.btn:hover { background: var(--cyan); color: var(--desk); }
.btn--accent { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.btn--accent:hover { background: #fff; border-color: #fff; }

/* ---------------------------------------------------------------- обложка: полёт сквозь альбом */
.flight { position: relative; --fg: max(24px, calc((100vw - 1720px) / 2 + 24px)); }   /* поля обложки шире, чем у текста */
.js-scrub .flight { height: 760vh; }
.flight__stage {
  position: relative; overflow: hidden;
  height: calc(100svh - var(--top)); min-height: 560px;
  perspective: 1100px; perspective-origin: 50% 42%;
}
.js-scrub .flight__stage { position: sticky; top: var(--top); }
.flight__anchor { position: absolute; top: 100vh; }

/* «чертёжный стол»: миллиметровка уходит к горизонту и бежит навстречу при полёте */
.flight__floor {
  position: absolute; left: -60%; right: -60%; top: 46%; height: 140%;
  transform-origin: 50% 0; transform: rotateX(78deg);
  background-image:
    linear-gradient(rgba(143, 211, 255, .32) 1.5px, transparent 1.5px),
    linear-gradient(90deg, rgba(143, 211, 255, .32) 1.5px, transparent 1.5px),
    linear-gradient(rgba(143, 211, 255, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 211, 255, .12) 1px, transparent 1px);
  background-size: 160px 160px, 160px 160px, 32px 32px, 32px 32px;
  background-position: 50% var(--run, 0px);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 22%, #000 100%);
          mask-image: linear-gradient(to bottom, transparent 0%, #000 22%, #000 100%);
}
.flight__horizon {
  position: absolute; left: 0; right: 0; top: calc(46% - 120px); height: 240px; pointer-events: none;
  background: radial-gradient(60% 50% at 50% 50%, rgba(255, 181, 71, .16), transparent 70%);
}

/* листы в пространстве */
.flight__world { position: absolute; inset: 0; z-index: 1; transform-style: preserve-3d; pointer-events: none; }
.fsheet {
  position: absolute; left: 50%; top: 47%;
  width: min(60vw, 1400px, calc((100svh - var(--top) - 110px) * var(--ar, 1.5)));
  aspect-ratio: var(--ar, 1.5); display: block; text-decoration: none;
  opacity: 0; will-change: transform, opacity; pointer-events: auto;
}
.fsheet__paper {
  position: absolute; inset: 0; padding: 2.2% 2.2% 3.4% 4%; overflow: hidden;
  background: var(--paper); border: 2px solid var(--ink);
  box-shadow: 0 50px 90px -30px rgba(0, 0, 0, .75), 0 0 0 10px rgba(247, 244, 236, .05);
}
.fsheet__paper::before {  /* рамка листа: 20 мм слева, 5 мм по краям */
  content: ""; position: absolute; inset: 1.2% 1.2% 1.2% 2.8%; border: 1.5px solid var(--ink); opacity: .7;
}
.fsheet__paper img { position: relative; width: 100%; height: 100%; object-fit: contain; display: block; }
.fsheet__tag {
  position: absolute; right: 1.2%; bottom: 1.2%; display: flex; align-items: center;
  font: 600 clamp(13px, .85vw, 16px)/1 var(--mono); color: var(--ink); background: var(--paper);
  border-top: 1.5px solid var(--ink); border-left: 1.5px solid var(--ink); padding-right: 10px;
}
.fsheet__tag b { background: var(--ink); color: var(--amber); padding: 7px 9px; margin-right: 9px; }

/* заставка */
.flight__intro {
  position: absolute; z-index: 5; left: var(--fg); top: 10%;
  max-width: min(50vw, 960px); will-change: opacity, transform;
}
.flight__intro h1 {
  font: 700 clamp(40px, 5.8vw, 118px)/.98 var(--sans); letter-spacing: -.02em; color: #fff; margin: 0 0 22px; white-space: nowrap;
  text-shadow: 0 6px 40px rgba(12, 35, 64, .8);
}
.flight__intro h1 em { font-style: normal; color: transparent; -webkit-text-stroke: 2px var(--amber); }
.flight__lead { font-size: clamp(16px, 1.2vw, 23px); color: var(--cyan-2); max-width: min(46vw, 820px); margin: 0 0 clamp(22px, 1.8vw, 34px); }
.flight__cta .btn { font-size: clamp(15px, .95vw, 18px); padding: clamp(14px, .95vw, 18px) clamp(20px, 1.3vw, 28px); }
.flight__team { margin: clamp(26px, 2.4vw, 44px) 0 0; padding-top: 14px; border-top: 1px solid var(--grid-major); max-width: min(46vw, 820px);
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 28px; }
.flight__team small { grid-column: 1 / -1; font: 500 clamp(11px, .7vw, 13px) var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--amber); }
.flight__team span { display: grid; gap: 2px; font: 600 clamp(15px, 1.05vw, 20px)/1.25 var(--sans); color: #fff; }
.flight__team i { font: normal 400 clamp(12px, .78vw, 14px) var(--mono); color: var(--cyan); }
.flight__cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* подписи листов */
.flight__caps { position: absolute; inset: 0; z-index: 4; pointer-events: none; }
.fcap {
  position: absolute; left: var(--fg); top: 50%; width: clamp(280px, 22vw, 440px);
  display: grid; gap: 6px; text-decoration: none; color: var(--cyan-2);
  padding: clamp(18px, 1.4vw, 28px); border-left: 3px solid var(--amber);
  background: rgba(12, 35, 64, .78); backdrop-filter: blur(6px);
  opacity: 0; transform: translateY(-50%); pointer-events: none;
}
.fcap.is-on { pointer-events: auto; }
.fcap__no { font: 500 clamp(12px, .8vw, 15px) var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--amber); }
.fcap__name { font: 700 clamp(30px, 3.4vw, 66px)/1 var(--sans); color: #fff; }
.fcap__full { font-size: clamp(15px, 1vw, 19px); color: var(--cyan); }
.fcap__q { font-size: clamp(17px, 1.3vw, 25px); line-height: 1.4; color: #fff; margin-top: 6px; }
.fcap__by { font: clamp(13px, .85vw, 16px) var(--mono); color: var(--cyan); margin-top: 6px; }
.fcap__by small { color: var(--red); background: var(--paper); padding: 1px 5px; font-size: 11px; }
.fcap__go { font: 500 clamp(13px, .85vw, 16px) var(--mono); color: var(--amber); margin-top: 4px; }
.fcap:hover .fcap__go { text-decoration: underline; }

/* шкала листов */
.flight__meter {
  position: absolute; z-index: 7; right: var(--fg); top: 50%;
  transform: translateY(-50%); display: grid; gap: clamp(8px, .75vw, 15px);
}
.flight__meter i { display: block; font-style: normal; font: 500 clamp(11px, .75vw, 15px) var(--mono); color: rgba(143, 211, 255, .5); text-align: right; transition: color .3s; }
.flight__meter i::after { content: ""; display: inline-block; width: 18px; height: 1.5px; margin-left: 8px; vertical-align: middle; background: currentColor; transition: width .3s; }
.flight__meter i.is-on { color: var(--amber); }
.flight__meter i.is-on::after { width: 34px; }
.flight__meter b { font-weight: 500; }

/* сам экран – лист чертежа: рамка и основная надпись */
.flight__frame {
  position: absolute; z-index: 3; inset: 12px 12px 12px 30px; pointer-events: none;
  border: 1.5px solid rgba(143, 211, 255, .55);
}
.titleblock {
  position: absolute; z-index: 6; right: 12px; bottom: 12px;
  display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  width: min(600px, calc(100% - 42px));
  border: 1.5px solid rgba(143, 211, 255, .55); border-right: 0; border-bottom: 0;
  background: rgba(12, 35, 64, .9); backdrop-filter: blur(6px);
  font: 13px/1.3 var(--mono); color: var(--cyan);
}
.titleblock__people { border-right: 1.5px solid rgba(143, 211, 255, .55); }
.titleblock__row { display: grid; grid-template-columns: 56px minmax(0, 1fr); border-top: 1px solid rgba(143, 211, 255, .35); }
.titleblock__row:first-child { border-top: 0; }
.titleblock__row small { grid-row: span 2; padding: 6px 8px; border-right: 1px solid rgba(143, 211, 255, .35); font-size: 11px; color: var(--amber); }
.titleblock__row b { padding: 5px 10px 0; font: 600 14px/1.2 var(--sans); color: #fff; }
.titleblock__row span { padding: 1px 10px 5px; font-size: 11px; }
.titleblock__main { display: grid; grid-template-rows: 1fr auto auto; }
.titleblock__name { padding: 10px 14px; font: 600 15px/1.3 var(--sans); color: #fff; }
.titleblock__nums { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid rgba(143, 211, 255, .35); }
.titleblock__nums span { padding: 6px 8px; border-left: 1px solid rgba(143, 211, 255, .35); font-size: 11px; }
.titleblock__nums span:first-child { border-left: 0; }
.titleblock__nums b { display: block; font: 600 18px/1.1 var(--mono); color: var(--amber); }
.titleblock__org { padding: 7px 14px; border-top: 1px solid rgba(143, 211, 255, .35); color: var(--amber); }

/* без анимации: листы – обычная сетка под заставкой */
html:not(.js-scrub) .flight__stage { height: auto; min-height: 0; perspective: none; padding: 72px 0 48px; display: flex; flex-direction: column; }
html:not(.js-scrub) .flight__intro { position: relative; top: 0; order: -1; }   /* без анимаций: сначала заголовок, потом листы */
html:not(.js-scrub) .flight__world { position: relative; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px;
  padding: 32px max(16px, calc((100vw - var(--wrap)) / 2)); }
html:not(.js-scrub) .fsheet { position: relative; left: auto; top: auto; width: 100%; aspect-ratio: 1.5; opacity: 1; }
html:not(.js-scrub) .flight__caps, html:not(.js-scrub) .flight__meter, html:not(.js-scrub) .flight__floor { display: none; }

/* ---------------------------------------------------------------- история (scroll-scrub) */
.story { position: relative; }
.js-scrub .story { height: 520vh; }
.js-scrub .story__pin { position: sticky; top: var(--top); height: calc(100svh - var(--top)); }
.story__pin {
  min-height: 560px;
  display: grid; grid-template-columns: minmax(320px, 30vw) 1fr; gap: clamp(24px, 4vw, 64px); align-items: center;
  padding: 24px max(24px, calc((100vw - 1720px) / 2 + 24px));
}
.story h2 { font: 700 clamp(28px, 2.8vw, 54px)/1.1 var(--sans); color: #fff; margin: 0 0 24px; }
.story__steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.story__step {
  position: relative; padding: 8px 0 8px 52px; color: var(--cyan-2);
  transition: color .3s; font-size: 16px;
}
.js-scrub .story__step { color: rgba(201, 236, 255, .45); }
.story__step b { color: inherit; font-weight: 600; }
.story__step p { margin: 4px 0 0; font-size: 14px; line-height: 1.5; }
.js-scrub .story__step p { max-height: 0; overflow: hidden; opacity: 0; transition: max-height .4s, opacity .4s; }
.story__no { position: absolute; left: 0; top: 7px; font: 500 13px/1 var(--mono); border: 1px solid currentColor; border-radius: 3px; padding: 5px 6px; }
.story__step.is-done { color: var(--cyan); }
.story__step.is-on { color: #fff; }
.story__step.is-on .story__no { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.js-scrub .story__step.is-on p { max-height: 80px; opacity: 1; }
.story__final { margin: 18px 0 0; font-size: 15px; color: var(--amber); }
.js-scrub .story__final { opacity: 0; transform: translateY(8px); transition: opacity .4s, transform .4s; }
.js-scrub .story.is-final .story__final { opacity: 1; transform: none; }
.story__stage { position: relative; height: 100%; display: grid; place-items: center; }
.route { width: 100%; height: auto; max-height: calc(100svh - var(--top) - 70px); overflow: visible; }
.pm-pool { fill: rgba(17, 49, 90, .55); stroke: rgba(143, 211, 255, .5); stroke-width: 1.2; }
.pm-sep { stroke: rgba(143, 211, 255, .28); stroke-width: 1; }
.pm-lane { font: 600 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; fill: var(--cyan); }
.pm-edge { fill: none; stroke: rgba(143, 211, 255, .45); stroke-width: 1.3; }
.pm-arrow { fill: rgba(143, 211, 255, .7); }
.pm-ghost { display: none; }
.pm-line { fill: none; stroke: var(--amber); stroke-width: 3; stroke-linejoin: round; filter: drop-shadow(0 0 6px rgba(255, 181, 71, .45)); }
.pm-start { fill: none; stroke: var(--cyan-2); stroke-width: 1.6; }
.pm-end { fill: none; stroke: var(--cyan-2); stroke-width: 3.2; }
.pm-task rect { fill: var(--desk); stroke: rgba(143, 211, 255, .55); stroke-width: 1.3; transition: fill .35s, stroke .35s; }
.pm-task text { font: 500 12.5px var(--sans); fill: rgba(201, 236, 255, .7); transition: fill .35s; }
.pm-no circle { fill: var(--desk-2); stroke: rgba(143, 211, 255, .55); stroke-width: 1.2; transition: fill .35s; }
.pm-no text { font: 600 10.5px var(--mono); fill: var(--cyan); }
.pm-task.is-done rect { stroke: var(--amber); fill: #1b3657; }
.pm-task.is-done text { fill: #fff; }
.pm-task.is-done .pm-no circle { fill: var(--amber); stroke: var(--amber); }
.pm-task.is-done .pm-no text { fill: var(--ink); }
.pm-task.is-on rect { fill: var(--amber); stroke: var(--amber); filter: drop-shadow(0 0 14px rgba(255, 181, 71, .55)); }
.pm-task.is-on text { fill: var(--ink); font-weight: 600; }
.pm-task.is-on .pm-no circle { fill: var(--ink); stroke: var(--amber); }
.pm-task.is-on .pm-no text { fill: var(--amber); }
.parcel rect { fill: #fff; stroke: var(--ink); stroke-width: 1.4; }
.parcel path { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.pm-fan { pointer-events: none; }
.pm-note line { stroke: var(--amber); stroke-width: 1.4; stroke-dasharray: 1; }
.pm-note rect { fill: var(--paper); stroke: var(--ink); stroke-width: 1.2; }
.pm-note text { font: 600 13px var(--mono); fill: var(--ink); }
.pm-core rect { fill: var(--amber); }
.pm-core text { font: 700 15px var(--sans); fill: var(--ink); }
.pm-core .pm-core__s { font: 500 11px var(--mono); }
.story__hint { position: absolute; bottom: 4px; right: 0; margin: 0; font: 12px var(--mono); color: var(--cyan); opacity: .7; }

/* ---------------------------------------------------------------- полосы и текст */
.band { padding: 96px 16px; }
.band__in { max-width: var(--text); margin: 0 auto; }
.band--paper { background: var(--paper); color: var(--ink); }
.band h2 { font: 700 clamp(26px, 3vw, 36px)/1.15 var(--sans); margin: 0 0 22px; color: inherit; }
.band:not(.band--paper) h2 { color: #fff; }
.band:not(.band--paper) strong { color: #fff; }

/* ---------------------------------------------------------------- карточки листов */
.cards-sec { padding: 96px max(16px, calc((100vw - var(--wrap)) / 2)); }
.cards-sec h2 { font: 700 clamp(28px, 3.4vw, 44px)/1.1 var(--sans); color: #fff; margin: 0 0 36px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 18px; }
.card {
  position: relative; display: grid; gap: 6px; align-content: start;
  min-height: 230px; padding: 22px 22px 52px;
  background: var(--paper); color: var(--ink); text-decoration: none;
  border-radius: 3px; box-shadow: 0 1px 0 rgba(0, 0, 0, .2), 0 18px 40px -24px rgba(0, 0, 0, .7);
  outline: 1px solid var(--rule); outline-offset: -8px;
  transition: transform .6s cubic-bezier(.2, .7, .2, 1) calc(var(--i) * 60ms), opacity .6s calc(var(--i) * 60ms), box-shadow .25s;
}
.js-scrub .card { transform: translateY(24px); opacity: 0; }
.js-scrub .cards.is-in .card { transform: none; opacity: 1; }
.card:hover { box-shadow: 0 1px 0 rgba(0, 0, 0, .2), 0 28px 50px -24px rgba(0, 0, 0, .9); }
.cards.is-in .card:hover { transform: translateY(-4px); transition-delay: 0s; }
.card__no { font: 500 12px var(--mono); color: var(--red); letter-spacing: .06em; text-transform: uppercase; }
.card__name { font: 700 30px/1.1 var(--sans); }
.card__full { font-size: 14px; color: var(--ink-2); }
.card__q { font-size: 16px; margin-top: 10px; }
.card__by {
  position: absolute; left: 8px; right: 8px; bottom: 8px; padding: 8px 14px;
  border-top: 1px solid var(--rule); font: 12px var(--mono); color: var(--ink-2);
}
.card__by::before { content: "Разраб. "; color: var(--red); }
.card--sum { background: var(--amber); outline-color: rgba(20, 34, 56, .35); }

/* ---------------------------------------------------------------- команда */
.team { padding: 96px 16px 120px; overflow-x: clip; }   /* увеличенная до удара печать не расширяет страницу */
.team__in { max-width: 860px; margin: 0 auto; }
.team h2 { font: 700 clamp(28px, 3.4vw, 44px)/1.1 var(--sans); color: #fff; margin: 0 0 28px; }
.team__stamp { border: 2px solid var(--cyan); }
.team__row { display: grid; grid-template-columns: minmax(180px, 260px) 1fr; border-top: 1px solid var(--cyan); }
.team__row:first-child { border-top: 0; }
.team__row b, .team__row span { padding: 14px 18px; }
.team__row b { color: #fff; font-weight: 600; border-right: 1px solid var(--cyan); }
.team__row span { font: 14px/1.5 var(--mono); color: var(--cyan); align-self: center; }
.team__row--org { background: rgba(143, 211, 255, .08); }
.team__links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* ---------------------------------------------------------------- лист нотации: шапка */
.sheet-hero { padding: 72px max(24px, calc((100vw - var(--page)) / 2)) 40px; }
.sheet-hero__in { max-width: 1240px; }
.sheet-hero h1 { font: 700 clamp(32px, 5vw, 60px)/1.05 var(--sans); color: #fff; margin: 0 0 16px; letter-spacing: -.01em; }
.sheet-hero__q { font-size: clamp(18px, 2.2vw, 24px); color: var(--amber); margin: 0 0 28px; }
.passport { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); border: 1.5px solid var(--cyan); }
.passport__row { padding: 12px 16px; border-right: 1px solid var(--grid-major); border-bottom: 1px solid var(--grid-major); }
.passport__row span { display: block; font: 500 11px/1.3 var(--mono); text-transform: uppercase; letter-spacing: .07em; color: var(--cyan); margin-bottom: 4px; }
.passport__row b { color: #fff; font-weight: 500; font-size: 15px; line-height: 1.35; }
.toc {
  position: sticky; top: var(--top); z-index: 40; display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none;
  padding: 10px max(24px, calc((100vw - var(--page)) / 2)); margin-bottom: 0;
  background: rgba(12, 35, 64, .9); backdrop-filter: blur(8px); border-bottom: 1px solid transparent; transition: border-color .2s;
}
.toc::-webkit-scrollbar { display: none; }
.toc.is-stuck { border-bottom-color: var(--grid-major); }
.toc a { white-space: nowrap; transition: background .2s, color .2s, border-color .2s; }
.toc a.is-on { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.toc a { font: 500 13px/1 var(--mono); color: var(--cyan); text-decoration: none; padding: 8px 12px; border: 1px solid var(--grid-major); border-radius: 3px; }
.toc a:hover { border-color: var(--amber); color: #fff; }

/* ---------------------------------------------------------------- статья на бумаге */
.doc {
  font-size: 17px;
}
article.doc {
  position: relative;
  max-width: min(var(--page), calc(100vw - 48px)); margin: 0 auto 0; padding: 56px clamp(16px, 4vw, 72px) 72px clamp(24px, 5vw, 88px);
  background: var(--paper); color: var(--ink);
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, .8);
}
article.doc::before {   /* рамка листа по ГОСТ: 20 мм слева, 5 мм с остальных сторон */
  content: ""; position: absolute; inset: 10px 10px 10px 34px; border: 1.5px solid var(--ink); pointer-events: none; opacity: .75;
}
.doc > *:not(.scrub):not(.table-wrap) { max-width: var(--text); margin-left: auto; margin-right: auto; }
.doc h2 {
  font: 700 28px/1.2 var(--sans); margin: 56px auto 18px; padding-top: 18px; border-top: 1.5px solid var(--ink);
  display: flex; gap: 14px; align-items: baseline;
}
.doc h2:first-child { margin-top: 0; }
.doc h3 { font: 600 21px/1.3 var(--sans); margin: 36px auto 12px; }
.doc p, .doc li { color: inherit; }
.doc a { color: #0f58b8; text-decoration-thickness: 1px; text-underline-offset: 2px; overflow-wrap: anywhere; }   /* длинные URL не распирают страницу на телефоне */
.doc a:hover { color: var(--red); }
.doc ol, .doc ul { padding-left: 1.4em; }
.doc li + li { margin-top: 6px; }
.doc code { font: 15px var(--mono); background: var(--paper-2); padding: 1px 5px; border-radius: 3px; }
.doc strong { color: inherit; }
.band .doc, .band.doc { color: inherit; }

.table-wrap { max-width: min(100%, 1240px); margin: 18px auto 26px; overflow-x: auto; }
.doc table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.45; background: #fffdf7; }
.doc th, .doc td { border: 1px solid var(--ink); padding: 9px 12px; text-align: left; vertical-align: top; }
.doc th { font: 600 13px/1.3 var(--mono); text-transform: uppercase; letter-spacing: .04em; background: var(--paper-2); }
.doc td[align="center"], .doc th[align="center"] { text-align: center; }
.doc tr.is-col td, .doc .is-col { background: rgba(255, 181, 71, .25); }
.band:not(.band--paper) .doc table, .band:not(.band--paper) table { background: transparent; }
.band:not(.band--paper) th, .band:not(.band--paper) td { border-color: var(--cyan); }
.band--paper table { background: #fffdf7; }

.margin-note {
  max-width: var(--text); margin: 26px auto; padding: 16px 20px 16px 22px;
  border-left: 4px solid var(--red); background: #fff6e3; font-size: 16px;
}
.margin-note--tip { border-left-color: #2f8f5b; background: #ecf7ef; }
.margin-note__title { font: 600 13px/1.3 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--red); margin: 0 0 6px; }
.margin-note--tip .margin-note__title { color: #2f8f5b; }
.margin-note p { margin: 0; }

/* ---------------------------------------------------------------- диаграмма: статичная, лаконичная */
.scrub { margin: 28px 0 32px; }
.sheet { position: relative; margin: 0; }
.sheet__draw {
  background: #fff; border: 1px solid #d9d3c3; border-radius: 6px;
  box-shadow: 0 1px 2px rgba(20, 34, 56, .06), 0 8px 24px -12px rgba(20, 34, 56, .25);
  padding: 18px; display: grid; place-items: center; overflow: hidden; cursor: zoom-in;
}
.sheet__draw > svg, .sheet__draw .mermaid svg { width: 100%; height: auto; max-height: 80vh; display: block; }
.sheet__draw .mermaid { margin: 0; width: 100%; display: grid; place-items: center; background: none; font-size: 15px; white-space: pre; overflow: auto; }
.sheet__draw .mermaid:not([data-processed]) { color: transparent; min-height: 240px; }
.sheet__draw .pkt { display: none !important; }               /* без «бегущих» точек на потоках */
.sheet__cap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 10px; font-size: 14px; color: var(--ink-2); }
.sheet__cap b { color: var(--ink); font-weight: 600; }
.sheet__by { font: 12px var(--mono); }
.sheet__full {
  position: absolute; top: 10px; right: 10px; z-index: 2; width: 34px; height: 34px;
  font: 16px/1 var(--sans); color: var(--ink); background: rgba(255, 255, 255, .92);
  border: 1px solid #d9d3c3; border-radius: 6px; cursor: pointer; opacity: 0; transition: opacity .15s, background .15s;
}
.sheet:hover .sheet__full, .sheet__full:focus-visible { opacity: 1; }
.sheet__full:hover { background: var(--ink); color: #fff; }
.scrub--tall .sheet { max-width: 820px; margin: 0 auto; }

.sheet.is-full {
  position: fixed; inset: 0; z-index: 200; display: grid; grid-template-rows: minmax(0, 1fr) auto;
  padding: 16px; background: rgba(5, 15, 30, .9);
}
.sheet.is-full .sheet__draw { overflow: hidden; cursor: grab; border-radius: 4px; }
.sheet.is-full .sheet__draw.is-drag { cursor: grabbing; }
.sheet.is-full .sheet__draw > * { transform-origin: 50% 50%; will-change: transform; }
.sheet.is-full .sheet__draw > svg, .sheet.is-full .sheet__draw .mermaid svg { max-height: calc(100vh - 90px); }
.sheet.is-full .sheet__full { opacity: 1; top: 26px; right: 26px; }
.sheet.is-full .sheet__cap { color: var(--cyan-2); }
.sheet.is-full .sheet__cap b { color: #fff; }

/* появление блоков при входе в экран (один раз, по времени, не по прокрутке) */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .6s cubic-bezier(.2, .7, .2, 1), transform .6s cubic-bezier(.2, .7, .2, 1); }
.rv.is-in { opacity: 1; transform: none; }
.table-wrap.rv tbody tr { opacity: 0; transform: translateX(-8px); transition: opacity .4s var(--d, 0ms), transform .4s var(--d, 0ms); }
.table-wrap.rv.is-in tbody tr { opacity: 1; transform: none; }
.doc tbody tr { transition: background .15s; }
.doc tbody tr:hover { background: #fff3d6; }

/* ---------------------------------------------------------------- подбор нотации */
.lh-pick { max-width: var(--text); margin: 18px auto 30px; display: grid; gap: 14px; }
.lh-pick__q { display: flex; flex-wrap: wrap; gap: 8px; }
.lh-pick__q button {
  font: 500 14px/1.3 var(--sans); text-align: left; cursor: pointer; color: var(--ink);
  background: #fffdf7; border: 1px solid var(--ink); border-radius: 3px; padding: 10px 14px;
}
.lh-pick__q button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.lh-pick__out { min-height: 92px; border: 1.5px dashed var(--ink); padding: 16px 20px; background: #fff; }
.lh-ans { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; }
.lh-ans__n { font: 700 26px/1 var(--sans); color: var(--red); white-space: nowrap; }
.lh-ans p { margin: 0 0 6px; }
.lh-pick__hint { margin: 0; color: var(--ink-2); }

/* ---------------------------------------------------------------- источники */
.doc--sources .lh-sources p { padding-left: 0; margin: 0 auto 12px; font-size: 15.5px; }
.doc--sources p:target { background: #fff1c9; outline: 6px solid #fff1c9; }

/* ---------------------------------------------------------------- листание */
.pager { max-width: min(var(--page), calc(100vw - 48px)); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; border-top: 1.5px solid var(--cyan); }
.pager a { padding: 28px 24px; text-decoration: none; color: #fff; font: 600 22px var(--sans); display: grid; gap: 6px; }
.pager small { font: 500 12px var(--mono); color: var(--amber); text-transform: uppercase; letter-spacing: .07em; }
.pager__next { text-align: right; border-left: 1px solid var(--grid-major); }
.pager a:hover { background: rgba(143, 211, 255, .07); }

/* ---------------------------------------------------------------- подвал */
.foot { border-top: 1px solid var(--grid-major); padding: 40px 16px 56px; font-size: 14px; color: var(--cyan); }
.foot__in { max-width: var(--page); margin: 0 auto; }
.foot b { color: #fff; }
.foot p { margin: 0 0 8px; }

/* ---------------------------------------------------------------- адаптивность */
/* ---------------------------------------------------------------- обложка: глубина сцены и чертёжные пометки */
/* фото чертёжного стола в синьке: заставка «на столе», при взлёте стол уходит вниз */
.flight__photo {
  position: absolute; inset: -6%; z-index: 0; pointer-events: none; will-change: transform, opacity;
  background: linear-gradient(90deg, rgba(12, 35, 64, .96) 0%, rgba(12, 35, 64, .8) 38%, rgba(12, 35, 64, .25) 75%, rgba(12, 35, 64, .5) 100%),
              linear-gradient(0deg, rgba(12, 35, 64, .9), transparent 40%),
              url("../hero/desk.webp") 60% 40% / cover no-repeat;
}
/* огромный номер текущего листа за сценой */
.flight__nums { position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.flight__nums span {
  position: absolute; right: calc(var(--fg) + 64px); top: 36%; opacity: 0;
  font: 700 min(62vh, 40vw)/.8 var(--mono); letter-spacing: -.06em;
  color: rgba(143, 211, 255, .035); -webkit-text-stroke: 1.5px rgba(143, 211, 255, .34);
  transform-origin: 100% 50%; will-change: transform, opacity;
}
/* блик на бумаге: ползёт по листу вслед за его поворотом */
.fsheet__paper::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; mix-blend-mode: soft-light;
  background: linear-gradient(115deg, transparent 38%, rgba(255, 255, 255, .55) 50%, transparent 62%) var(--gl, 50%) 0 / 320% 100% no-repeat;
}
.fsheet { transition: filter .25s linear; }
/* выноска и размерная линия */
.flight__dims { position: absolute; inset: 0; z-index: 4; width: 100%; height: 100%; pointer-events: none; opacity: 0; overflow: visible; }
.dims__lead { fill: none; stroke: var(--amber); stroke-width: 1.4; }
.dims__dot { fill: var(--amber); }
.dims__dim { fill: none; stroke: rgba(143, 211, 255, .75); stroke-width: 1.2; }
.dims__txt { font: 500 14px var(--mono); fill: var(--cyan-2); letter-spacing: .04em; }
/* перекрестие чертёжника */
@media (pointer: fine) { .js-scrub .flight__stage { cursor: crosshair; } .js-scrub .flight__stage a { cursor: pointer; } }
.flight__cross { position: absolute; inset: 0; z-index: 6; pointer-events: none; opacity: 0; transition: opacity .25s; --x: -100px; --y: -100px; }
.flight__cross.is-on { opacity: 1; }
.flight__cross i { position: absolute; background: rgba(143, 211, 255, .28); }
.flight__cross i:first-child { left: 0; right: 0; top: var(--y); height: 1px; }
.flight__cross i:last-of-type { top: 0; bottom: 0; left: var(--x); width: 1px; }
.flight__cross b { position: absolute; left: var(--x); top: var(--y); transform: translate(14px, 12px); white-space: nowrap;
  font: 500 12px var(--mono); color: var(--amber); background: rgba(12, 35, 64, .85); padding: 3px 7px; border: 1px solid rgba(255, 181, 71, .4); }
.flight__cross b::before { content: ""; position: absolute; left: -20px; top: -18px; width: 11px; height: 11px; border: 1.5px solid var(--amber); border-radius: 50%; }

/* ---------------------------------------------------------------- кнопки: магнит */
.btn { transition: background .2s, color .2s, transform .35s cubic-bezier(.2, .8, .2, 1); }

/* ---------------------------------------------------------------- горячие клавиши */
kbd { display: inline-block; min-width: 1.6em; padding: 1px 6px; text-align: center; font: 500 .85em var(--mono); color: var(--ink);
  background: var(--paper); border-radius: 3px; box-shadow: inset 0 -2px 0 var(--rule); }
.foot__keys { color: rgba(143, 211, 255, .7); }
.keys { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: 16px; background: rgba(6, 18, 34, .7);
  backdrop-filter: blur(4px); opacity: 0; visibility: hidden; transition: opacity .2s, visibility .2s; }
.keys.is-on { opacity: 1; visibility: visible; }
.keys__box { width: min(560px, 100%); background: var(--desk-2); border: 1.5px solid var(--cyan); padding: 26px 28px 24px; transform: translateY(10px); transition: transform .25s; }
.keys.is-on .keys__box { transform: none; }
.keys__t { font: 700 22px var(--sans); color: #fff; margin: 0 0 14px; }
.keys dl { display: grid; grid-template-columns: max-content 1fr; gap: 10px 18px; margin: 0 0 20px; }
.keys dt { color: var(--cyan-2); white-space: nowrap; } .keys dd { margin: 0; color: var(--cyan); }
.keys .btn { background: transparent; cursor: pointer; }
.keys .btn:hover { background: var(--cyan); color: var(--desk); }

/* ---------------------------------------------------------------- печать бюро */
.team__stamp { position: relative; }
.stamp { position: absolute; right: 18px; top: -78px; width: 172px; height: 172px; z-index: 2; pointer-events: none; opacity: 0; transform: rotate(-14deg) scale(2.6); }
.stamp svg { width: 100%; height: 100%; overflow: visible; }
.stamp circle { fill: none; stroke: #ec6a52; stroke-width: 4; }
.stamp circle + circle { stroke-width: 2; }
.stamp text { fill: #ec6a52; font-family: var(--mono); font-weight: 600; }
.stamp__ring { font-size: 15.5px; letter-spacing: .09em; }
.stamp__big { font-size: 23px; } .stamp__small { font-size: 13px; letter-spacing: .06em; }
.stamp.is-down { animation: stamp .42s cubic-bezier(.3, 1.6, .5, 1) forwards; }
.team__stamp.is-hit { animation: hit .38s .3s ease-out; }
@keyframes stamp { 0% { opacity: 0; transform: rotate(-14deg) scale(2.6); } 60% { opacity: .95; } 100% { opacity: .88; transform: rotate(-14deg) scale(1); } }
@keyframes hit { 0%, 100% { transform: none; } 30% { transform: translateY(3px) scale(.995); } 60% { transform: translateY(-1px); } }
html:not(.js-scrub) .stamp { opacity: .88; transform: rotate(-14deg); }

/* ---------------------------------------------------------------- шапка: поиск, отметки зачётки */
.top__search {
  flex: none; display: inline-flex; align-items: center; gap: 8px; margin-left: 4px;
  font: 500 13px/1 var(--mono); color: var(--cyan); background: transparent; cursor: pointer;
  padding: 8px 10px; border: 1px solid var(--grid-major); border-radius: 4px; transition: border-color .2s, color .2s;
}
.top__search:hover { color: #fff; border-color: var(--amber); }
.top__search svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.top__search kbd { font-size: 11px; padding: 0 5px; }
.top__nav a.is-read::after { content: "✓"; margin-left: 5px; font-size: 11px; color: var(--amber); }
.top__nav a[aria-current].is-read::after { color: var(--ink); }

/* ---------------------------------------------------------------- поиск по альбому */
html.is-finding { overflow: hidden; }
.finder {
  position: fixed; inset: 0; z-index: 95; display: flex; justify-content: center; align-items: flex-start;
  padding: 11vh 16px 16px; background: rgba(6, 18, 34, .74); backdrop-filter: blur(5px);
  opacity: 0; visibility: hidden; transition: opacity .18s, visibility .18s;
}
.finder.is-on { opacity: 1; visibility: visible; }
.finder__box {
  width: min(780px, 100%); max-height: 76vh; display: flex; flex-direction: column;
  background: var(--paper); color: var(--ink); border: 2px solid var(--ink);
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .75), 0 0 0 8px rgba(247, 244, 236, .07);
  transform: translateY(-10px); transition: transform .22s cubic-bezier(.2, .8, .2, 1);
}
.finder.is-on .finder__box { transform: none; }
.finder__field { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1.5px solid var(--ink); }
.finder__field svg { width: 22px; height: 22px; flex: none; fill: none; stroke: var(--red); stroke-width: 2.2; stroke-linecap: round; }
.finder__field input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; font: 500 19px var(--sans); color: var(--ink); }
.finder__field input::placeholder { color: #8b93a2; }
.finder__field input::-webkit-search-cancel-button { display: none; }
.finder__count { font: 500 12px var(--mono); color: var(--ink-2); padding: 8px 20px 0; min-height: 8px; }
.finder__list { overflow-y: auto; padding: 4px 8px 10px; overscroll-behavior: contain; }
.finder__list a {
  display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 2px 14px; padding: 10px 12px;
  color: inherit; text-decoration: none; border-left: 3px solid transparent; border-radius: 2px;
}
.finder__list a[aria-selected="true"] { background: #fff; border-left-color: var(--amber); box-shadow: 0 1px 0 var(--rule); }
.finder__k {
  grid-row: span 2; align-self: start; margin-top: 2px; text-align: center;
  font: 500 11.5px/1 var(--mono); padding: 4px 6px; border: 1px solid currentColor; border-radius: 3px;
}
.finder__k--el { color: #0f58b8; }
.finder__k--sheet { color: var(--red); }
.finder__k--sec { color: #2f7a52; }
.finder__k--src { color: var(--ink-2); }
.finder__t { font: 600 16px/1.3 var(--sans); }
.finder__s { font-size: 13.5px; line-height: 1.4; color: var(--ink-2); }
.finder mark { background: rgba(255, 181, 71, .5); color: inherit; border-radius: 2px; padding: 0 1px; }
.finder__keys { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0; padding: 10px 18px; border-top: 1px solid var(--rule); font: 12px var(--mono); color: var(--ink-2); }
.finder__tips { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 12px 12px 16px; color: var(--ink-2); }
.finder__tips button { font: 500 13px var(--mono); color: var(--ink); background: #fffdf7; border: 1px solid var(--ink); border-radius: 3px; padding: 5px 10px; cursor: pointer; }
.finder__tips button:hover { background: var(--ink); color: var(--paper); }
.finder__none { margin: 14px 12px; color: var(--ink-2); }
.doc tr.is-flash td, .doc p.is-flash { animation: flash 2.6s ease-out; }
@keyframes flash { 0%, 35% { background: rgba(255, 181, 71, .55); } 100% { background: transparent; } }

/* ---------------------------------------------------------------- лупа чертёжника */
.sheet__lens {
  position: absolute; top: 10px; right: 52px; z-index: 2; width: 34px; height: 34px; display: grid; place-items: center;
  color: var(--ink); background: rgba(255, 255, 255, .92); border: 1px solid #d9d3c3; border-radius: 6px; cursor: pointer;
  opacity: 0; transition: opacity .15s, background .15s;
}
.sheet__lens svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; }
.sheet:hover .sheet__lens, .sheet__lens:focus-visible, .sheet.is-lens .sheet__lens { opacity: 1; }
.sheet__lens:hover { background: var(--ink); color: #fff; }
.sheet.is-lens .sheet__lens { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.sheet.is-full .sheet__lens { display: none; }
.sheet.is-lensing .sheet__draw { cursor: none; }
@media (pointer: coarse) { .sheet__lens { display: none; } }
.loupe {
  position: fixed; left: 0; top: 0; z-index: 80; width: 260px; height: 260px; border-radius: 50%; overflow: hidden;
  pointer-events: none; opacity: 0; transition: opacity .12s; background: #fff;
  border: 3px solid var(--ink); box-shadow: 0 0 0 5px var(--amber), 0 22px 44px -12px rgba(0, 0, 0, .6);
}
.loupe.is-on { opacity: 1; }
.loupe::after {   /* перекрестие в центре линзы */
  content: ""; position: absolute; inset: 0; border-radius: 50%; pointer-events: none;
  background: linear-gradient(var(--red), var(--red)) 50% 50% / 14px 1.5px no-repeat, linear-gradient(var(--red), var(--red)) 50% 50% / 1.5px 14px no-repeat;
  box-shadow: inset 0 0 0 1px rgba(20, 34, 56, .25), inset 0 0 30px rgba(20, 34, 56, .12);
}
.loupe__in { position: absolute; left: 0; top: 0; background: #fff; }
.loupe__in svg { display: block; width: 100% !important; height: 100% !important; max-width: none !important; max-height: none !important; }
.loupe__z { position: absolute; left: 50%; bottom: 12px; z-index: 1; transform: translateX(-50%); font: 600 11px var(--mono); color: var(--ink); background: var(--amber); padding: 2px 7px; border-radius: 3px; }

/* ---------------------------------------------------------------- зачётка: печать на листе, отметки, ведомость */
/* место печати внизу справа – как на документе; печать «Изучено» ложится ровно на него */
article.doc.doc--sheet { padding-bottom: 200px; }
.mp {
  position: absolute; right: clamp(40px, 7vw, 130px); bottom: 34px; width: 142px; height: 142px; display: grid; place-items: center;
  border: 1.5px dashed rgba(20, 34, 56, .32); border-radius: 50%; pointer-events: none; transition: opacity .2s .3s;
}
.mp span { font: 500 14px var(--mono); letter-spacing: .12em; color: rgba(20, 34, 56, .42); }
.doc--sheet:has(.seal) .mp { opacity: 0; }
.seal {
  position: absolute; right: clamp(40px, 7vw, 130px); bottom: 34px; z-index: 3; width: 142px; height: 142px;
  pointer-events: none; transform: rotate(-14deg); opacity: .86; mix-blend-mode: multiply;
}
.seal.is-drop { animation: stamp .42s cubic-bezier(.3, 1.6, .5, 1) both; }
.seal svg, .quiz__seal svg { width: 100%; height: 100%; overflow: visible; }
.seal circle, .quiz__seal circle { fill: none; stroke: #c8432b; stroke-width: 4; }
.seal circle + circle, .quiz__seal circle + circle { stroke-width: 2; }
.seal text, .quiz__seal text { fill: #c8432b; font-family: var(--mono); font-weight: 600; }
.seal__ring { font-size: 13.5px; letter-spacing: .07em; }
.seal__big { font-size: 25px; letter-spacing: .03em; }
.seal__date { font-size: 12.5px; }
.toast {
  position: fixed; left: 50%; bottom: 22px; z-index: 96; max-width: min(600px, calc(100vw - 32px));
  padding: 12px 18px; font-size: 15px; line-height: 1.45; color: var(--cyan-2); background: var(--desk-2);
  border: 1.5px solid var(--amber); box-shadow: 0 18px 40px -12px rgba(0, 0, 0, .6);
  opacity: 0; transform: translate(-50%, 16px); transition: opacity .3s, transform .3s;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }
.toast b { color: #fff; }
.toast a { color: var(--amber); }
.card.is-read::after {
  content: "Изучено"; position: absolute; top: 16px; right: 16px; padding: 3px 8px;
  font: 600 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: #c8432b;
  border: 2px solid #c8432b; border-radius: 4px; transform: rotate(8deg); opacity: .85; mix-blend-mode: multiply;
}
.flight__meter i.is-read b::after { content: " ✓"; color: var(--amber); }
.ledger {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 14px 26px;
  margin-top: 26px; padding: 16px 20px; border: 1.5px solid var(--cyan); background: rgba(143, 211, 255, .05);
}
.ledger.is-full { border-color: var(--amber); }
.ledger__marks { display: flex; gap: 6px; }
.ledger__marks i {
  width: 34px; height: 34px; display: grid; place-items: center; font: 500 12px var(--mono); font-style: normal;
  color: var(--cyan); border: 1px solid var(--grid-major); transition: background .3s, color .3s;
}
.ledger__marks i.is-read { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.ledger__txt { margin: 0; font-size: 15px; color: var(--cyan-2); }
.ledger__txt b { color: #fff; }
.ledger__act { display: flex; align-items: center; gap: 14px; }
.ledger__reset { background: none; border: 0; padding: 0; font: 12px var(--mono); color: var(--cyan); text-decoration: underline; cursor: pointer; }
.ledger__reset:hover { color: #fff; }

/* ---------------------------------------------------------------- обложка: перелистывание листа */
.fsheet { backface-visibility: hidden; }

/* ---------------------------------------------------------------- финал сюжета: веер – ссылки на листы */
.story.is-final .pm-fan { pointer-events: auto; }
.pm-note { cursor: pointer; }
.pm-note .pm-note__no { font: 500 11px var(--mono); fill: var(--red); }
.pm-note rect { transition: fill .2s, stroke .2s; }
.pm-note:hover rect, .pm-note:focus-visible rect { fill: var(--amber); stroke: var(--amber); }
.pm-note:focus { outline: none; }
.pm-note:focus-visible rect { stroke-width: 3; }

/* ---------------------------------------------------------------- шторка «один процесс – два чертежа» */
.curtain { max-width: min(100%, 1240px); margin: 18px auto 34px; display: grid; gap: 8px; }
.curtain__pick { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.curtain__pick > span { width: 64px; font: 500 12px var(--mono); color: var(--ink-2); }
.curtain__pick button { font: 500 13px var(--mono); color: var(--ink); background: #fffdf7; border: 1px solid var(--ink); border-radius: 3px; padding: 6px 11px; cursor: pointer; }
.curtain__pick button:hover { border-color: var(--red); }
.curtain__pick button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.curtain__pick + .curtain__pick button[aria-pressed="true"] { background: var(--red); border-color: var(--red); color: #fff; }
.curtain__stage { --x: 50%; position: relative; margin-top: 8px; aspect-ratio: 16 / 9; overflow: hidden; background: #fff; border: 1.5px solid var(--ink); }
.curtain__img { position: absolute; inset: 0; margin: 0; background: #fff; }
.curtain__img img { position: absolute; inset: 44px 18px 18px; width: calc(100% - 36px); height: calc(100% - 62px); object-fit: contain; }
.curtain__img--a { background: #fffdf7; clip-path: inset(0 calc(100% - var(--x)) 0 0); }
.curtain__line { position: absolute; top: 0; bottom: 0; left: var(--x); z-index: 2; border-left: 2px solid var(--ink); pointer-events: none; }
.curtain__line i {
  position: absolute; top: 50%; left: -22px; width: 42px; height: 42px; margin-top: -21px; display: grid; place-items: center;
  font: 700 18px var(--sans); font-style: normal; color: var(--ink); background: var(--amber); border: 2px solid var(--ink); border-radius: 50%;
  box-shadow: 0 6px 16px -6px rgba(20, 34, 56, .6);
}
.curtain__stage:has(.curtain__range:focus-visible) .curtain__line i { outline: 3px solid #0f58b8; outline-offset: 3px; }
.curtain__range { position: absolute; inset: 0; z-index: 3; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: ew-resize; touch-action: pan-y; }
.curtain__tag { position: absolute; top: 12px; z-index: 2; padding: 4px 10px; font: 600 13px var(--mono); color: #fff; background: var(--ink); pointer-events: none; }
.curtain__tag--a { left: 12px; }
.curtain__tag--b { right: 12px; background: var(--red); }

/* ---------------------------------------------------------------- тренажёр */
.doc .btn { color: var(--ink); border-color: var(--ink); cursor: pointer; background: transparent; }
.doc .btn:hover { background: var(--ink); color: var(--paper); }
.doc .btn--accent { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.doc .btn--accent:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.doc--quiz { padding-top: 44px; }
.doc--quiz .quiz { max-width: 1240px; margin: 0 auto; }
.quiz__intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; align-items: center; }
.quiz__demo { position: relative; aspect-ratio: 4 / 3; }
.quiz__demo span {
  position: absolute; inset: 6% 10%; background-color: #fff; background-repeat: no-repeat; border: 1.5px solid var(--ink);
  box-shadow: 0 20px 40px -22px rgba(20, 34, 56, .7); transform: rotate(var(--r));
}
.quiz__rules p, .quiz__rules li { font-size: 17px; }
.quiz__best { padding: 10px 14px; background: #fff6e3; border-left: 4px solid var(--amber); }
.quiz__go { margin-top: 8px; font-size: 17px; padding: 15px 30px; }
.quiz__top { display: flex; align-items: center; gap: 18px; margin-bottom: 18px; font: 500 13px var(--mono); color: var(--ink-2); }
.quiz__score b { color: var(--ink); font-size: 15px; }
.quiz__track { flex: 1; display: flex; gap: 4px; margin: 0; padding: 0; list-style: none; }
.quiz__track li { flex: 1; height: 8px; background: var(--paper-2); border: 1px solid var(--rule); }
.quiz__track li + li { margin: 0; }
.quiz__track .is-cur { background: var(--ink); border-color: var(--ink); }
.quiz__track .is-ok { background: #2f8f5b; border-color: #2f8f5b; }
.quiz__track .is-half { background: var(--amber); border-color: var(--amber); }
.quiz__track .is-bad { background: var(--red); border-color: var(--red); }
.quiz__main { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(290px, 1fr); gap: 32px; align-items: start; }
.quiz__frag { margin: 0; }
.quiz__pane { position: relative; }
.quiz__win { position: relative; overflow: hidden; border: 1.5px solid var(--ink); background: #fff; }
.quiz__view {
  aspect-ratio: 4 / 3; background-color: #fff; background-repeat: no-repeat;
  transition: background-size .95s cubic-bezier(.65, .05, .25, 1), background-position .95s cubic-bezier(.65, .05, .25, 1);
}
.quiz__box { position: absolute; border: 3px solid var(--red); box-shadow: 0 0 0 9999px rgba(20, 34, 56, .14); opacity: 0; transition: opacity .35s .75s; pointer-events: none; }
.quiz__frag.is-whole .quiz__box { opacity: 1; }
.quiz__crop {   /* метки обреза по углам фрагмента */
  position: absolute; inset: -9px; pointer-events: none;
  background:
    linear-gradient(var(--ink), var(--ink)) 0 0 / 18px 2px no-repeat, linear-gradient(var(--ink), var(--ink)) 0 0 / 2px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 100% 0 / 18px 2px no-repeat, linear-gradient(var(--ink), var(--ink)) 100% 0 / 2px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 0 100% / 18px 2px no-repeat, linear-gradient(var(--ink), var(--ink)) 0 100% / 2px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 100% 100% / 18px 2px no-repeat, linear-gradient(var(--ink), var(--ink)) 100% 100% / 2px 18px no-repeat;
}
.quiz__frag figcaption { margin-top: 10px; font: 12px var(--mono); color: var(--ink-2); }
.quiz__q { font: 700 22px/1.2 var(--sans); margin: 0 0 14px; }
.quiz__opts { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.quiz__opts button {
  display: flex; align-items: center; gap: 10px; text-align: left; cursor: pointer;
  font: 600 16px var(--sans); color: var(--ink); background: #fffdf7; border: 1.5px solid var(--ink); border-radius: 3px; padding: 11px 12px;
  transition: background .15s, color .15s;
}
.quiz__opts button:hover:not(:disabled) { background: var(--ink); color: var(--paper); }
.quiz__opts button:hover:not(:disabled) kbd { background: var(--amber); }
.quiz__opts button.is-right { background: #2f8f5b; border-color: #2f8f5b; color: #fff; }
.quiz__opts button.is-wrong { background: var(--red); border-color: var(--red); color: #fff; }
.quiz__opts button:disabled { cursor: default; }
.quiz__opts button:disabled:not(.is-right):not(.is-wrong) { opacity: .4; }
.quiz__zoom { width: 100%; margin-top: 12px; padding: 9px 12px; font: 500 13px var(--mono); color: var(--ink); background: none; border: 1px dashed var(--ink); border-radius: 3px; cursor: pointer; }
.quiz__zoom:hover:not(:disabled) { border-style: solid; background: #fff; }
.quiz__zoom:disabled { opacity: .45; cursor: default; }
.quiz__res { margin-top: 16px; padding: 14px 16px; background: #fff; border-left: 4px solid var(--ink); }
.quiz__res.is-ok { border-left-color: #2f8f5b; }
.quiz__res.is-bad { border-left-color: var(--red); }
.quiz__verdict { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 0 0 8px; }
.quiz__stamp {
  display: inline-block; padding: 4px 10px; font: 700 14px var(--mono); letter-spacing: .08em; text-transform: uppercase;
  border: 2.5px solid currentColor; border-radius: 4px; transform: rotate(-6deg); animation: stampin .35s cubic-bezier(.3, 1.6, .5, 1) both;
}
.is-ok .quiz__stamp { color: #2f8f5b; }
.is-bad .quiz__stamp { color: var(--red); }
@keyframes stampin { from { opacity: 0; transform: rotate(-6deg) scale(2.2); } to { opacity: 1; transform: rotate(-6deg) scale(1); } }
.quiz__hint { margin: 0 0 12px; font-size: 15.5px; }
.quiz__next { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; }
.quiz__next a { font-size: 15px; }
.quiz__final { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 40px; align-items: start; }
.quiz__seal { width: 220px; height: 220px; transform: rotate(-12deg); }
html.js-scrub .quiz__seal { animation: stamp .45s .15s cubic-bezier(.3, 1.6, .5, 1) both; }
.quiz__seal .seal__big { font-size: 40px; }
.quiz__grade { margin: 0; font: 700 64px/1 var(--sans); }
.quiz__grade b { color: var(--red); }
.quiz__rank { margin: 10px 0 18px; font-size: 19px; }
.quiz__log { columns: 2; column-gap: 28px; margin: 0 0 14px; padding: 0; list-style: none; font-size: 15px; }
.quiz__log li { padding: 3px 0; break-inside: avoid; }
.quiz__log li + li { margin: 0; }
.quiz__log b { margin-right: 6px; font: 500 12px var(--mono); }
.quiz__log .is-ok b { color: #2f8f5b; }
.quiz__log .is-half b { color: #b8790f; }
.quiz__log .is-bad b { color: var(--red); }
.quiz__weak { margin: 0 0 18px; }
.quiz__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.quiz__need { font: 13px var(--mono); color: var(--ink-2); }
.quiz__form { display: flex; flex-wrap: wrap; align-items: end; gap: 12px; margin-top: 18px; }
.quiz__form label { display: grid; gap: 6px; font-weight: 600; }
.quiz__form input { min-width: min(320px, 100%); padding: 10px 12px; font: 17px var(--sans); color: var(--ink); background: #fff; border: 1.5px solid var(--ink); border-radius: 3px; }
.cert-host { margin-top: 34px; }
.cert-wrap { max-width: 1040px; margin: 0 auto; box-shadow: 0 24px 60px -24px rgba(20, 34, 56, .55); }
.cert-acts { text-align: center; margin: 18px 0 0; }

@media (max-width: 900px) {
  .top__search { padding: 8px; margin-left: 0; }
  .top__search span, .top__search kbd { display: none; }
  .ledger { grid-template-columns: 1fr; }
  .ledger__marks i { width: 30px; height: 30px; }
  .quiz__intro, .quiz__main, .quiz__final { grid-template-columns: 1fr; gap: 22px; }
  .quiz__demo { max-width: 420px; }
  .quiz__seal { width: 160px; height: 160px; }
  .quiz__grade { font-size: 48px; }
  .quiz__log { columns: 1; }
  .quiz__top { flex-wrap: wrap; gap: 8px 14px; }
  .quiz__track { order: 3; flex-basis: 100%; }
  .curtain__stage { aspect-ratio: 4 / 3; }
  article.doc.doc--sheet { padding-bottom: 160px; }
  .seal, .mp { width: 110px; height: 110px; right: 26px; bottom: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  .quiz__view { transition: none; }
  .quiz__stamp, .seal.is-drop { animation: none; }
}

@media (max-width: 900px) {
  .flight__nums, .flight__dims, .flight__cross { display: none; }
  .flight__photo { inset: 0; background-position: 30% 50%; }
  .stamp { width: 120px; height: 120px; right: -8px; top: -60px; }
}
@media (prefers-reduced-motion: reduce) { .flight__photo { opacity: .45; } }

@media (max-width: 900px) {
  .top { gap: 12px; }
  .brand__name { display: none; }
  .js-scrub .story { height: 460vh; }
  .story__pin { grid-template-columns: 1fr; grid-template-rows: auto 1fr; align-items: start; gap: 8px; padding-top: 16px; }
  .story h2 { font-size: 24px; margin-bottom: 10px; }
  .story__step { padding: 3px 0 3px 44px; font-size: 14px; }
  .js-scrub .story__step:not(.is-on) { display: none; }
  .story__step p { font-size: 13px; }
  .story__stage { max-height: none; min-height: 0; }
  .story__final { margin-top: 6px; font-size: 13px; }
  .js-scrub .flight { height: 820vh; }
  .flight__intro { top: 3%; right: 16px; }
  .flight__intro h1 { white-space: normal; font-size: clamp(34px, 10vw, 46px); margin-bottom: 14px; }
  .flight__lead { font-size: 14.5px; line-height: 1.5; max-width: none; margin-bottom: 18px; }
  .flight__cta { flex-wrap: nowrap; gap: 8px; }
  .flight__cta .btn { padding: 12px 14px; font-size: 13.5px; white-space: nowrap; }
  .flight__team { display: none; }
  .fsheet { width: min(92vw, calc(46svh * var(--ar, 1.5))); top: 40%; }
  .fcap { top: auto; bottom: 150px; left: 16px; right: 16px; width: auto; transform: none; padding: 12px 14px; gap: 3px; }
  .fcap__name { font-size: 28px; }
  .fcap__q { font-size: 15px; margin-top: 2px; }
  .fcap__full, .fcap__go { display: none; }
  .flight__meter { display: none; }
  .flight__frame { inset: 6px 6px 6px 14px; }
  .titleblock { right: 6px; bottom: 6px; width: calc(100% - 20px); grid-template-columns: 1fr; }
  .titleblock__main { display: none; }
  .titleblock__people { border-right: 0; display: grid; grid-template-columns: 1fr 1fr; }
  .titleblock__row { grid-template-columns: 1fr; border-top: 1px solid rgba(143, 211, 255, .35); }
  .titleblock__row small { display: none; }
  .titleblock__row b { font-size: 12.5px; }
  .titleblock__row span { font-size: 10px; }
  article.doc { padding-top: 40px; }
  article.doc::before { inset: 6px 6px 6px 14px; }
  .scrub { margin: 24px -8px; }
  .team__row { grid-template-columns: 1fr; }
  .team__row b { border-right: 0; padding-bottom: 0; }
  .pager a { font-size: 17px; padding: 20px 14px; }
  .lh-ans { grid-template-columns: 1fr; gap: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  .rv, .table-wrap.rv tbody tr { opacity: 1 !important; transform: none !important; transition: none !important; }
  .card { transform: none; opacity: 1; transition: none; }
  .story { height: auto; }
  .story__pin { position: static; height: auto; }
  .story__step p { max-height: none; opacity: 1; }
  .story__step:not(.is-on) { display: block; }
  .story__final { opacity: 1; transform: none; }
  .scrub { height: auto; }
  .scrub__pin { position: static; height: auto; }
}
@media print {
  body { background: #fff; color: #000; }
  .top, .foot, .pager, .sheet__full, .story, .flight { display: none; }
  .scrub { height: auto; }
  .scrub__pin { position: static; height: auto; }
}

/* ---------------------------------------------------------------- ссылки на источники на листах */
.lh-refs ul { list-style: none; padding-left: 0; }
.lh-refs li { padding-left: 3em; text-indent: -3em; font-size: 15.5px; }
.lh-refs li + li { margin-top: 10px; }
.lh-refs li > a:first-child { display: inline-block; min-width: 2.8em; text-indent: 0; font: 600 14px var(--mono); text-decoration: none; }

/* ---------------------------------------------------------------- пиктограммы элементов в таблицах */
.doc table img.sym { display: block; height: 84px; width: auto; margin: 2px 0 8px; padding: 6px 10px;
  background: #fff; border: 1px solid #ddd5c2; border-radius: 6px; }
.doc td:has(img.sym) { min-width: 200px; }
/* Mermaid – в натуральную величину (высокие схемы не сжимаются до высоты экрана) */
.sheet__draw .mermaid svg { max-height: none; width: auto; height: auto; }