/* Botahist — публичная страница курса. Токены: design/blueprint.md */
:root {
  --water: #DCE7EC;
  --paper: #F8FBFC;
  --ink: #0F1B2D;
  --cinnabar: #D8341D;
  --steel: #566B7F;
  --depth: #123B5E;
  --line: #C3D3DB;
  --sea: #CFE0E9;

  --scene-bg: var(--water);
  --scene-fg: var(--ink);
  /* приглушённый текст: чернила, смешанные с фоном, ≥4,5:1 (сталь на воде давала 4,38) */
  --muted: #5B6674;
  --scene-muted: var(--muted);

  --voice: 'Literata', Georgia, serif;
  --sans: 'Geologica', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --header: 64px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header) + 16px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--water); color: var(--ink); font: 400 1.0625rem/1.6 var(--sans); }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--cinnabar); outline-offset: 3px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 14px; z-index: 50; }
.skip:focus { left: 8px; }

/* ---------- типографика ---------- */
.h1, .h2 {
  font-family: var(--voice); font-weight: 300; letter-spacing: -0.015em; margin: 0;
  text-wrap: balance;
}
.h1 { font-size: clamp(2.5rem, 6.2vw, 5.25rem); line-height: 1.02; }
.h2 { font-size: clamp(2rem, 4.2vw, 3.5rem); line-height: 1.06; }
.key { font-family: var(--sans); font-weight: 800; color: var(--cinnabar); letter-spacing: -0.02em; white-space: nowrap; }
.lead { font-size: clamp(1.125rem, 1.6vw, 1.3125rem); line-height: 1.5; max-width: 34em; margin: 1.5rem 0 0; }
.note { font-size: 0.875rem; color: var(--muted); margin: 0.875rem 0 0; }

/* ---------- кнопки ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 24px;
  border-radius: 999px; border: 0; cursor: pointer; text-decoration: none;
  font: 700 1rem/1 var(--sans); background: var(--cinnabar); color: #fff;
  transition: background .2s, transform .15s;
}
.btn:hover { background: #B92A15; }
.btn:active { transform: scale(.98); }
.btn-link { display: inline-flex; align-items: center; min-height: 2.75rem; font: 500 1rem var(--sans); text-decoration: underline; text-underline-offset: 0.3125rem; text-decoration-thickness: 0.0625rem; }
.btn-link:hover { color: var(--cinnabar); }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; margin-top: 34px; }

/* ---------- шапка ---------- */
.top {
  position: sticky; top: 0; z-index: 20; height: var(--header);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.top-in { max-width: var(--wrap); height: 100%; margin: 0 auto; padding: 0 var(--gutter); display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; min-height: 2.75rem; font: 800 1.25rem var(--sans); letter-spacing: -0.02em; text-decoration: none; }
.brand span { color: var(--cinnabar); }
.nav { display: flex; gap: 22px; margin-right: auto; }
.nav a { display: inline-flex; align-items: center; min-height: 2.75rem; font-size: 0.9375rem; text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--ink); }
.top .login { display: inline-flex; align-items: center; min-height: 2.75rem; padding: 0 0.25rem; font-size: 0.9375rem; color: var(--muted); text-decoration: none; }
.top .login:hover { color: var(--ink); }
.top .btn { min-height: 2.75rem; padding: 0 1.125rem; font-size: 0.9375rem; }
/* узкие телефоны: шапка без прокрутки вбок (на 320 px кнопка выходила на 8 px за край) */
@media (max-width: 26.25rem) { .top-in { gap: 0.75rem; } .brand { font-size: 1.125rem; } .top .btn { padding: 0 0.875rem; } }
@media (max-width: 960px) { .nav { display: none; } .top-in { justify-content: space-between; } .brand { margin-right: auto; } }

/* ---------- сцена: карта листается ---------- */
.scene {
  background: var(--scene-bg); color: var(--scene-fg);
  transition: background-color .8s ease, color .5s ease;
}
.scene-in {
  max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter);
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(24px, 4vw, 64px);
}
.scene-map {
  position: sticky; top: calc(var(--header) + 24px); height: calc(100vh - var(--header) - 48px);
  grid-column: 2; grid-row: 1; align-self: start; margin: 24px 0;
}
.map-frame { position: relative; height: 100%; border-radius: 20px; overflow: hidden; background: var(--sea); }
.course-map { width: 100%; height: 100%; }
.era {
  position: absolute; left: 22px; top: 16px; margin: 0; pointer-events: none;
  font: 300 clamp(2.125rem, 4.6vw, 4rem)/1 var(--voice); color: var(--ink); letter-spacing: -0.02em;
  transition: opacity .35s ease;
}
.era.is-out { opacity: 0; }
.scene-steps { grid-column: 1; grid-row: 1; padding: 8vh 0 30vh; }
.step { min-height: 66vh; display: flex; flex-direction: column; justify-content: center; }
.step-hero { min-height: calc(100vh - var(--header)); padding-bottom: 6vh; }
.step-intro { min-height: 60vh; }
.scene .note, .mod .when { color: var(--scene-muted); transition: color .5s ease; }
.mod .when { margin: -0.25rem 0 1.125rem; font-size: 1rem; }
.topics { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.625rem; font-size: 1.0625rem; line-height: 1.4; }
.topics li { padding-left: 22px; position: relative; }
.topics li::before { content: ''; position: absolute; left: 0; top: .7em; width: 12px; height: 2px; background: var(--scene-muted); transition: background-color .5s ease; }

.mod { border-top: 1px solid currentColor; padding-top: 18px; max-width: 30em; }
.mod h3 { font: 300 clamp(1.75rem, 3vw, 2.5rem)/1.1 var(--voice); margin: 0 0 0.75rem; letter-spacing: -0.01em; }
.mod p { margin: 0; }

/* слои карты */
.m-sea { fill: var(--sea); }
.m-land { fill: var(--paper); stroke: #9FB5C3; stroke-width: .7; vector-effect: non-scaling-stroke; }
.m-lake { fill: var(--sea); stroke: #9FB5C3; stroke-width: .5; vector-effect: non-scaling-stroke; }
.m-river { fill: none; stroke: #8FB0C6; vector-effect: non-scaling-stroke; }
.m-river-1 { stroke-width: 1.1; }
.m-river-2 { stroke-width: .6; }
.m-route { fill: none; stroke: var(--cinnabar); stroke-width: 2.6; vector-effect: non-scaling-stroke; stroke-linejoin: round; stroke-linecap: round; }
.m-back { fill: none; stroke: var(--steel); stroke-width: 1.6; stroke-dasharray: 6 4; vector-effect: non-scaling-stroke; }
.m-arrow { fill: var(--cinnabar); }
.m-arrow-back { fill: var(--steel); }
.m-pt circle, .m-dots circle { fill: var(--ink); }
.m-pt text { fill: var(--ink); font-family: var(--sans); font-weight: 500; paint-order: stroke; stroke: var(--paper); stroke-width: .28em; stroke-linejoin: round; }
.m-year { font-family: var(--mono); fill: var(--cinnabar); }
.m-num circle { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.m-num text { font-family: var(--mono); font-weight: 500; fill: var(--ink); }
.m-water { fill: var(--steel); font-family: var(--sans); font-style: italic; }

.course-map .m-layer { opacity: 0; transition: opacity .2s ease; }
.course-map .m-layer.is-on { opacity: 1; transition: opacity .45s ease .35s; }
.course-map .m-layer .m-route { stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 1.6s cubic-bezier(.45, 0, .2, 1) .15s; }
.course-map .m-layer.is-on .m-route { stroke-dashoffset: 0; }
.no-js .course-map .m-overview { opacity: 1; }
.no-js .course-map .m-overview .m-route { stroke-dashoffset: 0; }

/* ---------- обычные секции ---------- */
.sec { padding: clamp(80px, 12vh, 140px) 0; }
.sec-in { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.sec-head { max-width: 46em; margin-bottom: clamp(36px, 6vh, 64px); }

/* урок: шкала из 60 минут, ширина отрезка = минуты */
.clock { list-style: none; margin: 0 0 40px; padding: 0; display: flex; gap: 6px; }
.clock li {
  flex: var(--w) 1 0; min-width: 0; height: clamp(120px, 16vw, 190px); border-radius: 14px;
  padding: 16px 18px; display: flex; flex-direction: column; justify-content: space-between; color: var(--paper);
}
.clock .c1 { background: var(--steel); }
.clock .c2 { background: var(--depth); }
.clock .c3 { background: var(--cinnabar); }
.clock .c4 { background: var(--ink); padding: 16px 10px; }
.clock .min { font: 300 clamp(2.75rem, 7vw, 6.5rem)/.9 var(--voice); letter-spacing: -0.03em; }
.clock .what { font-size: 0.9375rem; font-weight: 500; white-space: nowrap; }
.clock .c4 .what { display: none; }
.lesson-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; }
.lesson-steps h3 { font: 700 1.125rem/1.3 var(--sans); margin: 0 0 0.5rem; }
.lesson-steps h3::before { content: ''; display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 10px; vertical-align: 1px; }
.lesson-steps > div:nth-child(1) h3::before { background: var(--steel); }
.lesson-steps > div:nth-child(2) h3::before { background: var(--depth); }
.lesson-steps > div:nth-child(3) h3::before { background: var(--cinnabar); }
.lesson-steps > div:nth-child(4) h3::before { background: var(--ink); }
.lesson-steps p { margin: 0; font-size: 1rem; }
.lesson-extra { margin-top: 44px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; max-width: 980px; }
.lesson-extra p { margin: 0; }
@media (max-width: 900px) {
  .clock { gap: 4px; }
  .clock li { height: 96px; padding: 10px; border-radius: 10px; }
  .clock .what { display: none; }
  .lesson-steps { grid-template-columns: 1fr 1fr; gap: 24px; }
  .lesson-extra { grid-template-columns: 1fr; }
}
@media (max-width: 520px) { .lesson-steps { grid-template-columns: 1fr; } }

/* материалы: страницы веером на тёмной подложке */
.kit-grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: clamp(28px, 5vw, 72px); align-items: center; }
.desk { position: relative; aspect-ratio: 1 / 1; background: var(--depth); border-radius: 22px; overflow: hidden; }
.desk .pg {
  position: absolute; top: 12%; left: 50%; width: 48%; border-radius: 4px;
  box-shadow: 0 2px 0 rgba(0, 0, 0, .15), 0 30px 50px -20px rgba(0, 0, 0, .55);
  transition: transform .45s cubic-bezier(.3, .7, .2, 1), z-index 0s .2s;
}
.desk .pg[data-pg="b"] { transform: translateX(-12%) rotate(7deg); z-index: 1; }
.desk .pg[data-pg="a"] { transform: translateX(-88%) rotate(-6deg); z-index: 2; }
.desk .pg[data-pg="script"] { transform: translateX(-50%) translateY(6%) rotate(-1deg); z-index: 3; }
.desk .pg.is-front { z-index: 4; transition: transform .45s cubic-bezier(.3, .7, .2, 1), z-index 0s; }
.desk .pg[data-pg="b"].is-front { transform: translateX(-12%) translateY(-3%) rotate(4deg) scale(1.04); }
.desk .pg[data-pg="a"].is-front { transform: translateX(-88%) translateY(-3%) rotate(-3deg) scale(1.04); }
.desk .pg[data-pg="script"].is-front { transform: translateX(-50%) translateY(3%) rotate(-1deg) scale(1.04); }
.kit-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.kit-list li { padding: 1rem 0 1rem 1.125rem; border-left: 0.1875rem solid transparent; transition: border-color .2s, background-color .2s; font-size: 1rem; }
.kit-list li b { display: block; font-size: 1.125rem; margin-bottom: 0.25rem; }
.kit-list li[data-pg] { cursor: default; }
.kit-list li.is-on { border-left-color: var(--cinnabar); }
@media (max-width: 900px) {
  .kit-grid { grid-template-columns: 1fr; }
  .desk { max-width: 520px; width: 100%; margin: 0 auto; }
}

/* обо мне */
.about { background: var(--depth); color: var(--paper); }
.about-in { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(28px, 5vw, 80px); align-items: start; }
.about-photo { border-radius: 18px; width: 100%; height: auto; }
.about .key { color: #FF6A50; }
.about p { max-width: 34em; }
.proof { display: inline-block; margin: 34px 0 8px; background: #fff; border-radius: 14px; padding: 6px; max-width: 340px; }
.proof img { border-radius: 10px; }
.proof-cap { font-size: 0.875rem; color: #A9BCCC; margin: 0 0 1.875rem; }
@media (max-width: 860px) { .about-in { grid-template-columns: 1fr; } .about-photo { max-width: 420px; } }

/* цена */
.price-in { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(28px, 5vw, 80px); align-items: start; }
.price-card { background: var(--paper); border-radius: 22px; padding: clamp(26px, 4vw, 48px); box-shadow: 0 1px 0 var(--line), 0 30px 60px -40px rgba(15, 27, 45, .45); }
.price-num { margin: 0; font-size: clamp(4rem, 9vw, 7.5rem); line-height: .95; }
.price-for { margin: 0.75rem 0 1.75rem; font-size: 1.125rem; color: var(--muted); }
.price-trial { margin: 0; padding-top: 1.375rem; border-top: 0.0625rem solid var(--line); font-size: 1.0625rem; }
.price-card .actions { margin-top: 28px; }
.faq details { border-top: 1px solid var(--line); padding: 18px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; font-size: 1.125rem; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 1.125rem; min-height: 2.75rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font: 400 1.375rem/1 var(--mono); color: var(--cinnabar); }
.faq details[open] summary::after { content: '–'; }
.faq details p { margin: 12px 0 0; max-width: 36em; }
.tg { font-size: 1rem; color: var(--muted); }
@media (max-width: 860px) { .price-in { grid-template-columns: 1fr; } }

/* подвал */
.foot { border-top: 0.0625rem solid var(--line); padding: 1.75rem 0 2.5rem; font-size: 0.9375rem; color: var(--muted); }
.foot-in { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); display: flex; flex-wrap: wrap; align-items: center; gap: 0 28px; }
.foot-in a { display: inline-flex; align-items: center; min-height: 44px; }
.foot b { color: var(--ink); }

/* ---------- сцена на телефоне: карта сверху, текст под ней ---------- */
@media (max-width: 860px) {
  .scene-in { display: block; padding: 0; }
  .scene-map { position: sticky; top: var(--header); height: 42vh; margin: 0; z-index: 2; }
  .map-frame { border-radius: 0; }
  .era { left: 16px; top: 12px; }
  .scene-steps { padding: 0 var(--gutter) 20vh; }
  .step, .step-intro { min-height: 58vh; }
  .step-hero { min-height: auto; padding: 36px 0 48px; }
}

/* ---------- без анимаций ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .scene, .scene .note, .mod .when, .topics li::before, .era, .desk .pg, .course-map .m-layer, .course-map .m-layer .m-route { transition: none !important; }
}