/* Koch School — «Как проходит обучение»: макет платформы (каталог → урок → тест → сертификат).
   Дизайн и хореография: Open Design, проект «koch-school-steps-redesign» (steps-v3.html). */
.koch-steps {
  --koch-steps-bg: #0a0a0a;
  --koch-steps-fg: #ffffff;
  --koch-steps-muted: rgba(255, 255, 255, .7);
  --koch-steps-faint: rgba(255, 255, 255, .46);
  --koch-steps-line: rgba(255, 255, 255, .16);
  --koch-steps-offset: 80px;
  --koch-steps-gutter: clamp(20px, 4vw, 64px);
  --koch-steps-ui-bg: #f5f5f5;
  --koch-steps-ui-surface: #ffffff;
  --koch-steps-ui-fg: #000000;
  --koch-steps-ui-muted: #8c8c8c;
  --koch-steps-ui-border: #dbdbdb;
  --koch-steps-accent: #009fda;
  --koch-steps-ok: #28a745;
  --koch-steps-ease: cubic-bezier(.16, 1, .3, 1);
  --koch-steps-ease-io: cubic-bezier(.65, 0, .35, 1);
  --koch-steps-spring: cubic-bezier(.34, 1.56, .64, 1);
  --koch-steps-font: var(--koch-font-family, "Inter"), system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  position: relative;
  padding: clamp(80px, 12vh, 140px) var(--koch-steps-gutter);
  background: var(--koch-steps-bg);
  color: var(--koch-steps-fg);
  font-family: var(--koch-steps-font);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
.koch-steps *, .koch-steps *::before, .koch-steps *::after { box-sizing: border-box; }
.koch-steps img { display: block; max-width: none; height: auto; border: 0; }

.koch-steps__inner {
  max-width: 1440px; margin: 0 auto;
  display: grid; gap: 56px;
}

/* ---------- Левая колонка ---------- */
.koch-steps__copy { display: grid; justify-items: start; align-content: center; gap: 28px; min-width: 0; }
.koch-steps__title {
  margin: 0; color: var(--koch-steps-fg);
  font-family: var(--koch-steps-font);
  font-weight: 700; font-size: clamp(40px, 4.4vw, 72px); line-height: 1; letter-spacing: -.035em;
  text-wrap: balance;
}
.koch-steps__lead {
  margin: 0; max-width: 40ch;
  color: var(--koch-steps-muted); font-size: clamp(15px, 1.1vw, 17px); line-height: 1.55;
}
.koch-steps__steps { position: relative; width: 100%; }
.koch-steps__list { position: relative; list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; width: 100%; }
.koch-steps__track, .koch-steps__track-fill {
  position: absolute; left: 13.5px; top: 24px; bottom: 24px; width: 1px;
}
.koch-steps__track { background: var(--koch-steps-line); display: none; }
.koch-steps__track-fill { left: 0; top: 0; bottom: 0; background: var(--koch-steps-fg); transform-origin: 50% 0; transform: scaleY(0); }
.koch-steps__item {
  position: relative; margin: 0; padding: 10px 0;
  display: grid; grid-template-columns: 28px minmax(0, 1fr); column-gap: 20px;
}
.koch-steps__num {
  position: relative; z-index: 1;
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--koch-steps-bg); border: 1px solid var(--koch-steps-line);
  color: var(--koch-steps-faint);
  font-size: 11px; font-weight: 700; letter-spacing: .02em; font-variant-numeric: tabular-nums;
  transition: color .4s var(--koch-steps-ease), border-color .4s var(--koch-steps-ease), background-color .4s var(--koch-steps-ease);
}
.koch-steps__item-title {
  margin: 2px 0 0; color: var(--koch-steps-faint);
  font-family: var(--koch-steps-font);
  font-size: clamp(18px, 1.4vw, 21px); font-weight: 700; line-height: 1.25; letter-spacing: -.01em;
  transition: color .4s var(--koch-steps-ease);
}
.koch-steps__item-wrap { display: grid; grid-template-rows: 1fr; }
.koch-steps__item-wrap > div { min-height: 0; overflow: hidden; }
.koch-steps__item-text { margin: 6px 0 0; max-width: 36ch; color: var(--koch-steps-muted); font-size: 15px; line-height: 1.5; }
.koch-steps__media { grid-column: 1 / -1; min-width: 0; }

.koch-steps__cta {
  display: inline-flex; align-items: center; gap: 14px;
  min-height: 52px; padding: 0 8px 0 26px; border-radius: 999px;
  background: var(--koch-steps-fg); color: #000000;
  font-family: var(--koch-steps-font); font-size: 15px; font-weight: 700; letter-spacing: .01em; text-decoration: none;
  transition: transform .2s var(--koch-steps-ease), background-color .2s var(--koch-steps-ease);
}
.koch-steps__cta-ico {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  background: #000000; color: #ffffff;
  transition: transform .45s var(--koch-steps-ease);
}
.koch-steps__cta:hover { background: #f5f5f5; color: #000000; }
.koch-steps__cta:hover .koch-steps__cta-ico { transform: translate(2px, -1px) scale(1.05); }
.koch-steps__cta:active { transform: scale(.98); }
.koch-steps__cta:focus-visible { outline: 2px solid var(--koch-steps-fg); outline-offset: 4px; }

.koch-steps__stage { min-width: 0; display: flex; align-items: center; justify-content: center; }
.koch-steps__frame { position: relative; width: 100%; max-width: 640px; }

/* Появление при входе в вьюпорт */
.koch-steps--js .koch-steps__reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .9s var(--koch-steps-ease) var(--koch-steps-d, 0s), transform 1s var(--koch-steps-ease) var(--koch-steps-d, 0s);
}
.koch-steps--js.is-inview .koch-steps__reveal { opacity: 1; transform: none; }

/* ---------- Режим PIN (desktop ≥721px, анимация по скроллу) ---------- */
.koch-steps--pin { height: 360vh; padding: 0 var(--koch-steps-gutter); }
.koch-steps--pin .koch-steps__pin {
  position: sticky; top: 0; height: 100vh;
  padding-top: var(--koch-steps-offset);
  /* Safari: без собственного слоя вложенные композитные слои макета отстают от sticky при прокрутке */
  will-change: transform;
}
/* Safari: sticky-слой дребезжит на ±1px — JS пинит через fixed (left/width выставляет koch-steps.js) */
.koch-steps--pin.koch-steps--fixpin .koch-steps__pin { position: absolute; top: 0; left: var(--koch-steps-gutter); will-change: auto; }
.koch-steps--pin.koch-steps--fixpin.is-pinned .koch-steps__pin { position: fixed; top: 0; }
.koch-steps--pin.koch-steps--fixpin.is-pin-after .koch-steps__pin { top: auto; bottom: 0; }
.koch-steps--pin .koch-steps__inner {
  height: 100%;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  grid-template-rows: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 96px);
  padding: clamp(24px, 5vh, 56px) 0;
  align-items: center;
}
.koch-steps--pin .koch-steps__stage { height: 100%; }
.koch-steps--pin .koch-steps__frame { max-width: none; }
.koch-steps--pin .koch-steps__media { display: none; }
.koch-steps--pin .koch-steps__track { display: block; }
.koch-steps--pin .koch-steps__item-wrap {
  grid-template-rows: 0fr; opacity: 0;
  transition: grid-template-rows .5s var(--koch-steps-ease), opacity .35s var(--koch-steps-ease);
}
.koch-steps--pin .koch-steps__item-text { min-height: 3em; }
.koch-steps--pin .koch-steps__steps {
  --koch-steps-item-h: max(28px, calc(2px + 1.25 * clamp(18px, 1.4vw, 21px)));
  height: calc(4 * (20px + var(--koch-steps-item-h)) + 3 * 4px + 6px + 45px);
}
.koch-steps--pin .koch-steps__item.is-active .koch-steps__item-wrap { grid-template-rows: 1fr; opacity: 1; }
.koch-steps--pin .koch-steps__item.is-active .koch-steps__item-title { color: var(--koch-steps-fg); }
.koch-steps--pin .koch-steps__item.is-active .koch-steps__num,
.koch-steps--pin .koch-steps__item.is-done .koch-steps__num { color: #000000; background: var(--koch-steps-fg); border-color: var(--koch-steps-fg); }
@media (max-height: 760px) { .koch-steps--pin .koch-steps__lead { display: none; } }

/* ---------- Режим STACK (мобайл, reduced-motion, без anime.js) ---------- */
.koch-steps--js.koch-steps--stack .koch-steps__stage { display: none; }
.koch-steps--stack .koch-steps__list { gap: 48px; }
.koch-steps--stack .koch-steps__num { color: #000000; background: var(--koch-steps-fg); border-color: var(--koch-steps-fg); }
.koch-steps--stack .koch-steps__item-title { color: var(--koch-steps-fg); }
.koch-steps--stack .koch-steps__media { margin-top: 20px; }
@media (min-width: 721px) {
  .koch-steps--stack .koch-steps__item {
    grid-template-columns: 28px minmax(0, 4fr) minmax(0, 7fr); align-items: start;
  }
  .koch-steps--stack .koch-steps__media { grid-column: 3; grid-row: 1; margin-top: 0; }
  .koch-steps--stack .koch-steps__media .koch-steps__screen { max-width: 640px; }
}
@media (max-width: 720px) {
  .koch-steps { padding: 80px 20px; }
  .koch-steps__inner { gap: 40px; }
  .koch-steps__item { column-gap: 14px; }
}

/* =================== Макет экрана платформы =================== */
.koch-steps__screen {
  position: relative; width: 100%;
  background: var(--koch-steps-ui-bg); color: var(--koch-steps-ui-fg);
  border-radius: 16px; overflow: hidden;
  font: 400 13px/1.4 var(--koch-steps-font); letter-spacing: 0; text-align: left;
  pointer-events: none; user-select: none;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .8);
}
.koch-steps__screen span, .koch-steps__screen div { display: block; }
.koch-steps__bar {
  display: flex !important; align-items: center; gap: 12px;
  height: 44px; padding: 0 14px; background: #0a0a0a; color: #ffffff;
}
.koch-steps__bar-logo { width: 75px; height: 13px; }
.koch-steps__bar-sep { width: 1px; height: 16px; background: rgba(255, 255, 255, .16); }
.koch-steps__bar-name { font-size: 12px; font-weight: 700; color: rgba(255, 255, 255, .7); }
.koch-steps__bar-progress { margin-left: auto; display: flex !important; align-items: center; gap: 10px; }
.koch-steps__bar-label { font-size: 11px; color: rgba(255, 255, 255, .46); display: none !important; }
.koch-steps__meter { width: 64px; height: 4px; border-radius: 2px; background: rgba(255, 255, 255, .16); overflow: hidden; }
.koch-steps__meter-fill {
  height: 100%; background: var(--koch-steps-accent); transform-origin: 0 50%;
  transform: scaleX(var(--koch-steps-pct, 1));
}
.koch-steps__pct { width: 34px; text-align: right; font-size: 12px; font-weight: 700; font-variant-numeric: tabular-nums; }
.koch-steps__avatar {
  width: 26px; height: 26px; border-radius: 50%; display: grid !important; place-items: center;
  background: rgba(255, 255, 255, .16); font-size: 10px; font-weight: 700; letter-spacing: .02em;
}
.koch-steps__view { position: relative; padding: 14px; }

/* типографика UI */
.koch-steps__t-h { font-size: 16px; font-weight: 700; letter-spacing: -.01em; }
.koch-steps__t-cap { font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--koch-steps-ui-muted); }
.koch-steps__t-s { font-size: 11.5px; color: var(--koch-steps-ui-muted); }
.koch-steps__btn {
  display: flex !important; align-items: center; justify-content: center;
  height: 32px; padding: 0 14px; border-radius: 999px;
  font-size: 12px; font-weight: 700; letter-spacing: .02em; white-space: nowrap;
}
.koch-steps__btn--dark { background: #000000; color: #ffffff; }
.koch-steps__btn--ghost { border: 1px solid var(--koch-steps-ui-border); background: var(--koch-steps-ui-surface); }

/* 1 · Каталог */
.koch-steps__cat-head { display: flex !important; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.koch-steps__chips { display: none !important; gap: 6px; }
.koch-steps__chip {
  height: 26px; padding: 0 11px; border-radius: 999px; border: 1px solid var(--koch-steps-ui-border);
  background: var(--koch-steps-ui-surface); font-size: 11.5px; line-height: 24px; white-space: nowrap;
}
.koch-steps__chip.is-on { background: #000000; border-color: #000000; color: #ffffff; }
.koch-steps__cards { display: grid !important; grid-template-columns: 1fr 1fr; gap: 10px; }
.koch-steps__card {
  position: relative; display: flex !important; flex-direction: column;
  padding: 6px; border-radius: 14px; background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border);
}
.koch-steps__ring { position: absolute; inset: -1px; border-radius: 14px; box-shadow: 0 0 0 2px #000000; }
.koch-steps__cover { aspect-ratio: 4 / 3; border-radius: 8px; overflow: hidden; background: var(--koch-steps-ui-border); }
.koch-steps__cover img, .koch-steps__poster, .koch-steps__thumb img, .koch-steps__fly img {
  width: 100%; height: 100%; object-fit: cover;
}
.koch-steps__card-body { flex: 1; padding: 10px 4px 10px; display: grid !important; gap: 4px; align-content: start; }
.koch-steps__card-body .koch-steps__t-cap { display: none; }
.koch-steps__card-title { font-size: 12.5px; font-weight: 700; line-height: 1.3; }
.koch-steps__card--alt { opacity: .55; }
.koch-steps__company {
  margin-top: 10px; padding: 10px 12px; border-radius: 12px;
  display: flex !important; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border);
}
.koch-steps__company-title { font-size: 12.5px; font-weight: 700; }

/* 2 · Урок */
.koch-steps__layer--lesson { display: grid; gap: 12px; }
.koch-steps__player { position: relative; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #000000; }
.koch-steps__poster { position: absolute; inset: 0; }
.koch-steps__controls {
  position: absolute; inset: 0; color: #ffffff;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 55%, rgba(0, 0, 0, .55));
}
.koch-steps__play {
  position: absolute; left: 50%; top: 50%; width: 44px; height: 44px; margin: -22px 0 0 -22px;
  border-radius: 50%; background: rgba(255, 255, 255, .92); color: #000000;
}
.koch-steps__play > span { position: absolute; left: 50%; top: 50%; width: 18px; height: 18px; margin: -9px 0 0 -9px; }
.koch-steps__play svg { width: 100%; height: 100%; display: block; }
.koch-steps__ico-play { opacity: 0; }
.koch-steps__timeline { position: absolute; left: 12px; right: 12px; bottom: 10px; display: flex !important; align-items: center; gap: 10px; }
.koch-steps__video-track { flex: 1; height: 3px; border-radius: 2px; background: rgba(255, 255, 255, .3); overflow: hidden; }
.koch-steps__video-fill { height: 100%; background: #ffffff; transform-origin: 0 50%; transform: scaleX(var(--koch-steps-v, .62)); }
.koch-steps__time { font-size: 10.5px; font-weight: 400; font-variant-numeric: tabular-nums; }
.koch-steps__lesson-meta { display: grid !important; gap: 4px; }
.koch-steps__lesson-title { font-size: 15px; font-weight: 700; letter-spacing: -.01em; }
.koch-steps__files { display: grid !important; gap: 6px; margin-top: 6px; }
.koch-steps__file {
  display: flex !important; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 10px;
  background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border);
}
.koch-steps__pdf {
  flex: none; padding: 2px 5px; border-radius: 4px; border: 1px solid var(--koch-steps-ui-fg);
  font-size: 9px; font-weight: 700; letter-spacing: .06em;
}
.koch-steps__file-name { flex: 1; font-size: 12px; font-weight: 400; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.koch-steps__aside { padding: 6px; border-radius: 14px; background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border); }
.koch-steps__tabs { display: flex !important; gap: 2px; padding: 3px; border-radius: 10px; background: var(--koch-steps-ui-bg); margin-bottom: 4px; }
.koch-steps__tab { flex: 1; height: 26px; line-height: 26px; text-align: center; border-radius: 8px; font-size: 11.5px; font-weight: 400; color: var(--koch-steps-ui-muted); }
.koch-steps__tab.is-on { background: var(--koch-steps-ui-surface); color: var(--koch-steps-ui-fg); box-shadow: 0 1px 2px rgba(0, 0, 0, .08); }
.koch-steps__lessons { position: relative; }
.koch-steps__now { display: none !important; position: absolute; left: 0; right: 0; top: 0; height: 50px; border-radius: 10px; background: var(--koch-steps-ui-bg); }
.koch-steps__row { position: relative; display: flex !important; align-items: center; gap: 10px; height: 50px; padding: 0 8px; border-radius: 10px; }
.koch-steps__row.is-now { background: var(--koch-steps-ui-bg); }
.koch-steps__tick { position: relative; flex: none; width: 18px; height: 18px; border-radius: 50%; border: 1.5px solid var(--koch-steps-ui-border); }
.koch-steps__check {
  position: absolute; inset: -1.5px; border-radius: 50%; background: var(--koch-steps-ok); color: #ffffff;
  opacity: 0; transform: scale(0);
}
.koch-steps__row--done .koch-steps__check { opacity: 1; transform: none; }
.koch-steps__check svg, .koch-steps__mark svg { width: 100%; height: 100%; }
.koch-steps__row-text { min-width: 0; flex: 1; display: flex !important; justify-content: space-between; gap: 8px; align-items: center; }
.koch-steps__row-title { font-size: 12px; font-weight: 400; line-height: 1.3; }

/* 3 · Тест */
.koch-steps__test-head { display: flex !important; align-items: center; gap: 12px; flex-wrap: wrap; }
.koch-steps__thumb { flex: none; width: 64px; height: 36px; border-radius: 6px; overflow: hidden; background: #000000; }
.koch-steps__test-lesson { flex: 1; min-width: 0; }
.koch-steps__test-name { font-size: 13px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.koch-steps__counter { display: grid !important; gap: 6px; justify-items: end; }
.koch-steps__counter-text { display: grid !important; font-size: 11.5px; font-weight: 700; font-variant-numeric: tabular-nums; }
.koch-steps__counter-text > span { grid-area: 1 / 1; text-align: right; }
.koch-steps__counter-q { opacity: 0; }
.koch-steps__segs { display: flex !important; gap: 3px; }
.koch-steps__seg { width: 12px; height: 4px; border-radius: 2px; background: var(--koch-steps-ui-border); overflow: hidden; }
.koch-steps__seg > span { height: 100%; background: #000000; transform-origin: 0 50%; }
.koch-steps__q { margin-top: 16px; font-size: 15px; font-weight: 700; line-height: 1.3; letter-spacing: -.01em; }
.koch-steps__opts { display: grid !important; gap: 8px; margin-top: 12px; }
.koch-steps__opt {
  position: relative; display: flex !important; align-items: center; gap: 10px;
  min-height: 48px; padding: 8px 12px; border-radius: 12px;
  background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border);
  font-size: 12px; line-height: 1.35;
}
.koch-steps__opt-text { flex: 1; }
.koch-steps__sel { position: absolute; inset: -1px; border-radius: 12px; box-shadow: inset 0 0 0 2px var(--koch-steps-ok); }
.koch-steps__radio { position: relative; flex: none; width: 18px; height: 18px; border-radius: 50%; border: 1.5px solid var(--koch-steps-ui-border); }
.koch-steps__mark { position: absolute; inset: -1.5px; border-radius: 50%; background: var(--koch-steps-ok); color: #ffffff; }
.koch-steps__verdict { font-size: 11px; font-weight: 700; color: var(--koch-steps-ok); letter-spacing: .02em; }
.koch-steps__result { display: grid !important; gap: 8px; margin-top: 12px; }
.koch-steps__cell { padding: 9px 12px; border-radius: 12px; background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border); }
.koch-steps__cell-value { display: flex !important; align-items: center; gap: 7px; margin-top: 2px; font-size: 12.5px; font-weight: 700; }
.koch-steps__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--koch-steps-ok); }
.koch-steps__dot--wait { background: transparent; border: 1.5px solid var(--koch-steps-ui-muted); }
.koch-steps__get { align-self: center; height: 40px; }

/* 4 · Сертификат */
.koch-steps__layer--cert { perspective: 1400px; }
.koch-steps__veil { display: none !important; }
.koch-steps__sheet {
  position: relative; width: 100%; border-radius: 14px; overflow: hidden;
  background: var(--koch-steps-ui-surface); border: 1px solid var(--koch-steps-ui-border);
  box-shadow: 0 30px 60px -36px rgba(0, 0, 0, .35);
  transform-origin: 50% 100%;
}
.koch-steps__sheet-head { display: flex !important; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 18px; background: #0a0a0a; color: #ffffff; }
.koch-steps__sheet-head img { width: 64px; height: 13px; }
.koch-steps__sheet-brand { text-align: right; }
.koch-steps__sheet-brand > span:first-child { font-size: 11.5px; font-weight: 700; }
.koch-steps__sheet-brand > span:last-child { font-size: 9.5px; color: rgba(255, 255, 255, .7); letter-spacing: .06em; text-transform: uppercase; }
.koch-steps__sheet-body { padding: 18px 18px 16px; }
.koch-steps__sheet-title { font-size: 24px; font-weight: 700; line-height: 1.05; letter-spacing: -.02em; }
.koch-steps__sheet-kicker { margin-top: 12px; }
.koch-steps__sheet-name { margin-top: 2px; padding-bottom: 8px; border-bottom: 1px solid var(--koch-steps-ui-border); font-size: 19px; font-weight: 700; letter-spacing: -.01em; }
.koch-steps__sheet-done { margin-top: 10px; }
.koch-steps__sheet-course { margin-top: 2px; font-size: 13.5px; font-weight: 700; line-height: 1.3; }
.koch-steps__sheet-foot {
  display: grid !important; grid-template-columns: 1fr 1fr; gap: 12px; align-items: end;
  margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--koch-steps-ui-border);
}
.koch-steps__val { margin-top: 2px; font-size: 12.5px; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: .02em; }
.koch-steps__badge {
  grid-column: 1 / -1; justify-self: start;
  display: inline-flex !important; align-items: center; gap: 6px;
  height: 28px; padding: 0 12px 0 8px; border-radius: 999px;
  background: var(--koch-steps-ok); color: #ffffff; font-size: 12px; font-weight: 700; letter-spacing: .02em;
}
.koch-steps__badge svg { width: 14px; height: 14px; }
.koch-steps__sheet-org { padding: 9px 18px; background: var(--koch-steps-ui-bg); border-top: 1px solid var(--koch-steps-ui-border); font-size: 11px; color: var(--koch-steps-ui-muted); }

.koch-steps__fly, .koch-steps__cursor { display: none !important; }

/* ---- Компактный экран: показываем только слой своего шага ---- */
.koch-steps__screen:not(.koch-steps__screen--canvas) .koch-steps__layer { display: none; }
.koch-steps__screen[data-koch-state="1"]:not(.koch-steps__screen--canvas) [data-koch-layer="1"],
.koch-steps__screen[data-koch-state="2"]:not(.koch-steps__screen--canvas) [data-koch-layer="2"],
.koch-steps__screen[data-koch-state="3"]:not(.koch-steps__screen--canvas) [data-koch-layer="3"],
.koch-steps__screen[data-koch-state="4"]:not(.koch-steps__screen--canvas) [data-koch-layer="4"] { display: block; }
.koch-steps__screen[data-koch-state="2"]:not(.koch-steps__screen--canvas) [data-koch-layer="2"] { display: grid; }
.koch-steps__screen:not(.koch-steps__screen--canvas) .koch-steps__row:nth-child(4) { background: var(--koch-steps-ui-bg); }

/* ---- Компактный экран: проигрывание при появлении (мобайл) ---- */
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__ring { opacity: 0; }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__card--alt { opacity: 1; }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__video-fill { transform: scaleX(0); }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__row--done .koch-steps__check { opacity: 0; transform: scale(0); }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__sel,
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__verdict { opacity: 0; }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__mark { opacity: 0; transform: scale(.3); }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__seg--fx > span { transform: scaleX(0); }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__counter-q { opacity: 1; }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__counter-done { opacity: 0; }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__cell,
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__get,
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__print { opacity: 0; transform: translateY(10px); }
.koch-steps--play .koch-steps__screen:not(.is-played) .koch-steps__badge { opacity: 0; transform: scale(1.6); }

.koch-steps--play .is-played .koch-steps__ring,
.koch-steps--play .is-played .koch-steps__card--alt { transition: opacity .5s var(--koch-steps-ease) .35s; }
.koch-steps--play .is-played .koch-steps__meter-fill { transition: transform 1s var(--koch-steps-ease) .5s; }
.koch-steps--play .is-played .koch-steps__video-fill { transition: transform 2.2s cubic-bezier(.4, 0, .2, 1) .3s; }
.koch-steps--play .is-played .koch-steps__check { transition: opacity .3s var(--koch-steps-ease) calc(.9s + var(--koch-steps-i, 0) * .7s), transform .5s var(--koch-steps-spring) calc(.9s + var(--koch-steps-i, 0) * .7s); }
.koch-steps--play .is-played .koch-steps__sel { transition: opacity .3s var(--koch-steps-ease) .5s; }
.koch-steps--play .is-played .koch-steps__mark { transition: opacity .3s var(--koch-steps-ease) .5s, transform .5s var(--koch-steps-spring) .5s; }
.koch-steps--play .is-played .koch-steps__verdict { transition: opacity .4s var(--koch-steps-ease) .7s; }
.koch-steps--play .is-played .koch-steps__seg--fx > span { transition: transform .25s var(--koch-steps-ease) calc(.8s + var(--koch-steps-i, 0) * .07s); }
.koch-steps--play .is-played .koch-steps__counter-text > span { transition: opacity .3s var(--koch-steps-ease) 1.4s; }
.koch-steps--play .is-played .koch-steps__cell,
.koch-steps--play .is-played .koch-steps__get { transition: opacity .5s var(--koch-steps-ease) calc(1.5s + var(--koch-steps-i, 0) * .15s), transform .6s var(--koch-steps-ease) calc(1.5s + var(--koch-steps-i, 0) * .15s); }
.koch-steps--play .is-played .koch-steps__print { transition: opacity .5s var(--koch-steps-ease) calc(.2s + var(--koch-steps-i, 0) * .09s), transform .6s var(--koch-steps-ease) calc(.2s + var(--koch-steps-i, 0) * .09s); }
.koch-steps--play .is-played .koch-steps__badge { transition: opacity .2s var(--koch-steps-ease) 1.3s, transform .6s var(--koch-steps-spring) 1.3s; }

/* =================== Экран-холст (desktop pin) 720×520 =================== */
.koch-steps__screen--canvas { position: absolute; left: 0; top: 0; width: 720px; height: 520px; transform-origin: 0 0; font-size: 13px; contain: layout paint; }
.koch-steps__screen--canvas .koch-steps__sheet,
.koch-steps__screen--canvas .koch-steps__fly img,
.koch-steps__screen--canvas .koch-steps__cursor { will-change: transform; }
.koch-steps__screen--canvas .koch-steps__bar { height: 52px; padding: 0 20px; gap: 14px; }
.koch-steps__screen--canvas .koch-steps__bar-logo { width: 81px; height: 14px; }
.koch-steps__screen--canvas .koch-steps__bar-label { display: block !important; }
.koch-steps__screen--canvas .koch-steps__meter { width: 120px; }
.koch-steps__screen--canvas .koch-steps__view { position: absolute; left: 0; right: 0; top: 52px; bottom: 0; padding: 0; }
.koch-steps__screen--canvas .koch-steps__layer { position: absolute; inset: 0; padding: 22px 24px; }
.koch-steps__screen--canvas .koch-steps__t-h { font-size: 18px; }

.koch-steps__screen--canvas .koch-steps__cat-head { margin-bottom: 16px; }
.koch-steps__screen--canvas .koch-steps__chips { display: flex !important; }
.koch-steps__screen--canvas .koch-steps__cards { gap: 16px; }
.koch-steps__screen--canvas .koch-steps__card { padding: 8px; }
.koch-steps__screen--canvas .koch-steps__cover { aspect-ratio: auto; height: 140px; }
.koch-steps__screen--canvas .koch-steps__card--pick .koch-steps__cover img { visibility: hidden; }
.koch-steps__screen--canvas .koch-steps__card-body { padding: 12px 6px 12px; gap: 5px; }
.koch-steps__screen--canvas .koch-steps__card-body .koch-steps__t-cap { display: block; }
.koch-steps__screen--canvas .koch-steps__card-title { font-size: 15px; }
.koch-steps__screen--canvas .koch-steps__btn { height: 34px; }
.koch-steps__screen--canvas .koch-steps__company { margin-top: 16px; padding: 12px 16px; }
.koch-steps__screen--canvas .koch-steps__company-title { font-size: 13px; }
.koch-steps__screen--canvas .koch-steps__card--alt { opacity: 1; }
.koch-steps__screen--canvas .koch-steps__ring { opacity: 0; }

.koch-steps__screen--canvas .koch-steps__layer--lesson { display: grid; grid-template-columns: minmax(0, 1fr) 228px; gap: 20px; align-content: start; opacity: 0; }
.koch-steps__screen--canvas .koch-steps__player { background: transparent; }
.koch-steps__screen--canvas .koch-steps__poster { visibility: hidden; }
.koch-steps__screen--canvas .koch-steps__controls { opacity: 0; }
.koch-steps__screen--canvas .koch-steps__play { width: 52px; height: 52px; margin: -26px 0 0 -26px; }
.koch-steps__screen--canvas .koch-steps__ico-play { opacity: 1; }
.koch-steps__screen--canvas .koch-steps__ico-pause { opacity: 0; }
.koch-steps__screen--canvas .koch-steps__lesson-meta { margin-top: 14px; }
.koch-steps__screen--canvas .koch-steps__lesson-title { font-size: 17px; }
.koch-steps__screen--canvas .koch-steps__now { display: block !important; }
.koch-steps__screen--canvas .koch-steps__row--done .koch-steps__check { opacity: 0; transform: scale(0); }
.koch-steps__screen--canvas .koch-steps__row:nth-child(4) { background: transparent; }

.koch-steps__screen--canvas .koch-steps__layer--test { opacity: 0; }
.koch-steps__screen--canvas .koch-steps__thumb { width: 96px; height: 54px; background: transparent; }
.koch-steps__screen--canvas .koch-steps__thumb img { visibility: hidden; }
.koch-steps__screen--canvas .koch-steps__test-name { font-size: 14px; }
.koch-steps__screen--canvas .koch-steps__seg { width: 14px; }
.koch-steps__screen--canvas .koch-steps__q { margin-top: 20px; font-size: 17px; }
.koch-steps__screen--canvas .koch-steps__opts { grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.koch-steps__screen--canvas .koch-steps__opt { min-height: 58px; padding: 10px 14px; font-size: 12.5px; }
.koch-steps__screen--canvas .koch-steps__result { grid-template-columns: 1fr 1fr auto; gap: 10px; margin-top: 16px; }
.koch-steps__screen--canvas .koch-steps__counter-q { opacity: 1; }
.koch-steps__screen--canvas .koch-steps__counter-done,
.koch-steps__screen--canvas .koch-steps__sel,
.koch-steps__screen--canvas .koch-steps__mark,
.koch-steps__screen--canvas .koch-steps__verdict,
.koch-steps__screen--canvas .koch-steps__cell,
.koch-steps__screen--canvas .koch-steps__get { opacity: 0; }
.koch-steps__screen--canvas .koch-steps__seg--fx > span { transform: scaleX(0); }

.koch-steps__screen--canvas .koch-steps__layer--cert { display: grid; place-items: center; }
.koch-steps__screen--canvas .koch-steps__veil { display: block !important; position: absolute; inset: 0; background: var(--koch-steps-ui-bg); opacity: 0; }
.koch-steps__screen--canvas .koch-steps__sheet { width: 520px; opacity: 0; }
.koch-steps__screen--canvas .koch-steps__sheet-head { padding: 16px 24px; }
.koch-steps__screen--canvas .koch-steps__sheet-head img { width: 79px; height: 16px; }
.koch-steps__screen--canvas .koch-steps__sheet-brand > span:first-child { font-size: 12.5px; }
.koch-steps__screen--canvas .koch-steps__sheet-body { padding: 22px 28px 18px; }
.koch-steps__screen--canvas .koch-steps__sheet-title { font-size: 30px; }
.koch-steps__screen--canvas .koch-steps__sheet-name { font-size: 24px; }
.koch-steps__screen--canvas .koch-steps__sheet-course { font-size: 15px; }
.koch-steps__screen--canvas .koch-steps__sheet-foot { grid-template-columns: 1fr 1fr auto; }
.koch-steps__screen--canvas .koch-steps__badge { grid-column: auto; justify-self: end; opacity: 0; }
.koch-steps__screen--canvas .koch-steps__sheet-org { padding: 10px 28px; }
.koch-steps__screen--canvas .koch-steps__print { opacity: 0; }

/* Общий элемент «обложка курса → постер видео → миниатюра» */
.koch-steps__screen--canvas .koch-steps__fly { display: block !important; position: absolute; inset: 0; }
.koch-steps__fly img { position: absolute; left: 0; top: 0; }
.koch-steps__fly-b { opacity: 0; }
.koch-steps__screen--canvas .koch-steps__cursor { display: block !important; position: absolute; left: 0; top: 0; width: 0; height: 0; opacity: 0; z-index: 3; }
.koch-steps__arrow { position: absolute; left: -2px; top: -2px; width: 20px; height: 24px; transform-origin: 2px 2px; }
.koch-steps__arrow svg { width: 100%; height: 100%; display: block; }
.koch-steps__click { position: absolute; left: -16px; top: -16px; width: 32px; height: 32px; border-radius: 50%; border: 1.5px solid #000000; opacity: 0; }

@media (prefers-reduced-motion: reduce) {
  .koch-steps *, .koch-steps *::before, .koch-steps *::after { transition: none !important; }
}