/* Движок презентаций reknow.ru: слайд 1280×720, масштаб под окно,
   колонтитул на каждом слайде, пошаговое появление (.step), заметки (N),
   обзор (O), печать в PDF — по слайду на страницу. */
:root {
  --navy: #17213B;
  --ink: #1d2540;
  --muted: #5b6585;
  --line: #d9deeb;
  --paper: #ffffff;
  --soft: #f4f6fb;
  --pink: #E8459B;
  --violet: #8B7BF0;
  --teal: #0f9d8a;
  --green: #3a9a3a;
  --amber: #e39b17;
  --red: #d64545;
  --blue: #2f6fd6;
  --pink-soft: #fde8f2;
  --violet-soft: #ece9fd;
  --teal-soft: #e0f5f1;
  --amber-soft: #fdf2dc;
  --blue-soft: #e4eefc;
  --red-soft: #fbe5e5;
  --font: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: #0d1326; font-family: var(--font); color: var(--ink); }
body { overflow: hidden; }

.deck { position: fixed; inset: 0; display: grid; place-items: center; }
.slide {
  position: absolute; left: 50%; top: 50%;
  width: 1280px; height: 720px;
  margin: -360px 0 0 -640px;
  background: var(--paper);
  padding: 44px 64px 70px;
  display: none; flex-direction: column;
  overflow: hidden;
  transform-origin: center center;
}
.slide.active { display: flex; }

/* ---------- колонтитул ---------- */
.rk-foot {
  position: absolute; left: 0; right: 0; bottom: 0; height: 46px;
  display: flex; align-items: center; gap: 14px;
  padding: 0 28px; font-size: 15px; color: var(--muted);
  border-top: 1px solid var(--line); background: #fbfcfe;
}
.rk-foot .brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--navy); letter-spacing: .01em; }
.rk-foot .brand svg { width: 24px; height: 24px; }
.rk-foot .brand b { color: var(--pink); font-weight: 700; }
.rk-foot .mid { flex: 1; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rk-foot .num { font-variant-numeric: tabular-nums; min-width: 64px; text-align: right; }
.slide::before { /* тонкая фирменная полоса сверху */
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 6px;
  background: linear-gradient(90deg, var(--navy) 0 40%, var(--violet) 40% 70%, var(--pink) 70% 100%);
}

/* ---------- типографика ---------- */
.kicker { font-size: 17px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--pink); margin: 0 0 6px; }
h1 { font-size: 54px; line-height: 1.08; margin: 0 0 18px; color: var(--navy); letter-spacing: -.01em; }
h2 { font-size: 38px; line-height: 1.12; margin: 0 0 18px; color: var(--navy); letter-spacing: -.005em; }
h3 { font-size: 24px; margin: 0 0 8px; color: var(--navy); }
p, li { font-size: 24px; line-height: 1.38; }
p { margin: 0 0 12px; }
ul { margin: 0; padding-left: 26px; }
li { margin: 0 0 8px; }
small, .small { font-size: 18px; color: var(--muted); }
.muted { color: var(--muted); }
.pink { color: var(--pink); } .violet { color: var(--violet); } .teal { color: var(--teal); }
.green { color: var(--green); } .amber { color: var(--amber); } .red { color: var(--red); } .blue { color: var(--blue); }
b, strong { color: var(--navy); }
.units { display: none; position: absolute; top: 18px; right: 28px; font-size: 14px; color: var(--muted); font-family: var(--mono); }

/* ---------- раскладки ---------- */
.body { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.row { display: flex; gap: 28px; align-items: stretch; flex: 1; min-height: 0; }
.col { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.col-2 { flex: 2; } .col-3 { flex: 3; }
.center { justify-content: center; align-items: center; text-align: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.fig { flex: 1; min-height: 0; display: flex; align-items: center; justify-content: center; }
.fig svg { width: 100%; height: 100%; max-width: 100%; max-height: 100%; }

/* ---------- блоки ---------- */
.card { background: var(--soft); border-radius: 18px; padding: 18px 22px; border: 1px solid var(--line); }
.card.pink { background: var(--pink-soft); border-color: #f6bfdc; color: inherit; }
.card.violet { background: var(--violet-soft); border-color: #d2ccfa; color: inherit; }
.card.teal { background: var(--teal-soft); border-color: #b5e6dd; color: inherit; }
.card.amber { background: var(--amber-soft); border-color: #f4d79c; color: inherit; }
.card.blue { background: var(--blue-soft); border-color: #bcd2f6; color: inherit; }
.card.red { background: var(--red-soft); border-color: #f2bcbc; color: inherit; }
.card h3 { margin-bottom: 6px; }
.card p, .card li { font-size: 22px; }

.formula {
  font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif;
  font-size: 46px; color: var(--navy); text-align: center;
  background: #fff; border: 3px solid var(--navy); border-radius: 18px;
  padding: 16px 28px; margin: 10px auto; display: inline-block; line-height: 1.25;
}
.formula.big { font-size: 64px; padding: 20px 40px; }
.formula.sm { font-size: 32px; border-width: 2px; padding: 10px 20px; }
.formula .lbl { display: block; font-family: var(--font); font-size: 17px; color: var(--muted); margin-top: 4px; }
.eq { font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif; }
.chem { font-family: var(--font); font-size: 28px; color: var(--navy); }

.pill { display: inline-block; padding: 3px 12px; border-radius: 999px; font-size: 17px; font-weight: 700; background: var(--navy); color: #fff; }
.pill.pink { background: var(--pink); } .pill.violet { background: var(--violet); } .pill.teal { background: var(--teal); }
.pill.amber { background: var(--amber); } .pill.blue { background: var(--blue); } .pill.green { background: var(--green); }

.callout { border-left: 8px solid var(--pink); background: var(--pink-soft); padding: 12px 18px; border-radius: 0 14px 14px 0; font-size: 22px; }
.callout.violet { border-color: var(--violet); background: var(--violet-soft); }
.callout.teal { border-color: var(--teal); background: var(--teal-soft); }

table.t { border-collapse: collapse; width: 100%; font-size: 21px; }
table.t th, table.t td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
table.t th { background: var(--navy); color: #fff; font-weight: 600; }
table.t tr:nth-child(even) td { background: var(--soft); }

ol.tasks { margin: 0; padding-left: 30px; }
ol.tasks li { font-size: 25px; margin-bottom: 14px; }
.lvl { display: inline-block; font-size: 14px; font-weight: 700; padding: 2px 8px; border-radius: 6px; margin-right: 6px; vertical-align: middle; }
.lvl.b { background: var(--teal-soft); color: var(--teal); }
.lvl.a { background: var(--violet-soft); color: #5a49c9; }
.lvl.p { background: var(--amber-soft); color: #9a6408; }
.lvl.e { background: var(--pink-soft); color: #b8237a; }

/* ---------- титул ---------- */
.slide.title { background: radial-gradient(1200px 600px at 85% 20%, #26335a 0%, var(--navy) 60%); color: #fff; justify-content: center; }
.slide.title h1 { color: #fff; font-size: 60px; max-width: 980px; }
.slide.title .kicker { color: #ffb3da; }
.slide.title .meta { font-size: 21px; color: #c9d0ea; line-height: 1.6; }
.slide.title .meta b { color: #fff; }
.slide.title .rk-foot { background: rgba(0,0,0,.18); border-top-color: rgba(255,255,255,.12); color: #c9d0ea; }
.slide.title .rk-foot .brand { color: #fff; }
.slide.title .hero { position: absolute; right: 56px; top: 90px; width: 400px; height: 480px; opacity: .95; }

/* ---------- скрытый паспорт ---------- */
.slide.passport { font-size: 18px; }
.slide.passport table.t { font-size: 16px; }
.slide.passport table.t td, .slide.passport table.t th { padding: 5px 9px; }

/* ---------- шаги ---------- */
.step { transition: opacity .35s ease, transform .35s ease; }
.step.hidden-step { opacity: 0; transform: translateY(8px); pointer-events: none; }
svg .step.hidden-step { transform: none; }

/* ---------- заметки ---------- */
.notes { display: none; }
#notes-panel {
  position: fixed; left: 0; right: 0; bottom: 0; max-height: 38vh; overflow: auto;
  background: #111a33; color: #e6e9f5; font-size: 17px; line-height: 1.5;
  padding: 14px 22px 18px; border-top: 3px solid var(--pink); display: none; z-index: 10;
}
#notes-panel.on { display: block; }
#notes-panel h4 { margin: 0 0 6px; color: #ffb3da; font-size: 15px; letter-spacing: .06em; text-transform: uppercase; }
#notes-panel ul { padding-left: 20px; }
#notes-panel li { font-size: 17px; margin: 0 0 4px; }
#help { position: fixed; right: 12px; top: 10px; color: #8d96b8; font-size: 13px; z-index: 11; opacity: .7; }

/* ---------- обзор ---------- */
body.overview { overflow: auto; }
body.overview .deck { position: static; display: grid; grid-template-columns: repeat(auto-fill, 330px); gap: 18px; padding: 18px; place-items: start; justify-content: center; }
body.overview .slide { display: flex; position: relative; left: 0; top: 0; margin: 0; transform: scale(.25) !important; transform-origin: 0 0; width: 1280px; height: 720px; cursor: pointer; }
body.overview .slide-wrap { width: 320px; height: 180px; position: relative; outline: 2px solid transparent; }
body.overview .slide-wrap.cur { outline-color: var(--pink); }
body.overview .step.hidden-step { opacity: 1; transform: none; }

/* ---------- печать ---------- */
@page { size: 1280px 720px; margin: 0; }
@media print {
  html, body { background: #fff; overflow: visible; height: auto; }
  .deck { position: static; display: block; }
  .slide { display: flex !important; position: relative; left: 0; top: 0; margin: 0; transform: none !important; page-break-after: always; break-after: page; }
  .step.hidden-step { opacity: 1 !important; transform: none !important; }
  #notes-panel, #help { display: none !important; }
  .slide { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}
ol.tasks[style*="--fs"] li { font-size: var(--fs); }
.slide .row ol.tasks li { line-height: 1.4; }
.big-cards .card li, .big-cards .card p { font-size: 26px; }
.big-cards .card h3 { font-size: 28px; }
.big-cards .card { flex: 1; }

body.show-units .units { display: block; }
#deck-bar { position: fixed; left: 12px; top: 8px; z-index: 11; }
#deck-bar a { display: inline-block; font: 600 13px var(--font); color: #fff; background: rgba(232,69,155,.9);
  padding: 5px 12px; border-radius: 999px; text-decoration: none; }
#deck-bar a:hover { background: var(--pink); }
@media print { #deck-bar { display: none !important; } }

/* формулы из рисунков (deck.js liftFO): слой поверх SVG */
.fo-ov { transition: opacity .35s ease; }
.fo-ov.hid { opacity: 0; }
.fo-ov .katex { white-space: nowrap; }
/* режим печати на экране (?print, #pdf): раскладка как у печати — нужна, чтобы рассчитать слои до печати */
body.printing { overflow: visible; height: auto; background: #fff; }
body.printing .deck { position: static; display: block; }
body.printing .slide { display: flex !important; position: relative; left: 0; top: 0; margin: 0 auto; transform: none !important; }
body.printing #help { display: none; }

/* «Свой урок» (mix.js): каждый слайд — в своём хосте с Shadow DOM */
.mix-host { position: absolute; left: 50%; top: 50%; width: 1280px; height: 720px; margin: -360px 0 0 -640px;
  display: none; transform-origin: center center; }
.mix-host.on { display: block; }
body.printing .mix-host { display: block; position: relative; left: 0; top: 0; margin: 0 auto; transform: none !important; }
@media print {
  .mix-host { display: block !important; position: relative; left: 0; top: 0; margin: 0; transform: none !important;
    page-break-after: always; break-after: page; }
}