/* ==========================================================================
   LMS-HRM — каркас приложения и экраны
   ========================================================================== */

/* ==========================================================================
   Вход
   ========================================================================== */
.login {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  background: var(--md-sys-color-surface);
  overflow: auto;
}
.login__art {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg,
    oklch(0.42 0.19 285) 0%,
    oklch(0.32 0.16 292) 48%,
    oklch(0.24 0.11 275) 100%);
  color: #fff;
  padding: 56px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.login__art::before,
.login__art::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .55;
}
.login__art::before { width: 520px; height: 520px; background: #7DE2D1; top: -140px; right: -160px; }
.login__art::after { width: 460px; height: 460px; background: #FFB4A2; bottom: -180px; left: -120px; opacity: .38; }
.login__art > * { position: relative; z-index: 1; }
.login__brand { display: flex; align-items: center; gap: 14px; font-weight: 700; font-size: 1.25rem; }
.login__brand-mark {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 16px;
  background: rgba(255,255,255,.16);
  backdrop-filter: blur(8px);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.22);
}
.login__headline { font-size: clamp(2.4rem, 4.2vw, 3.6rem); line-height: 1.05; font-weight: 750; letter-spacing: -0.03em; max-width: 15ch; }
.login__lead { margin-top: 20px; font-size: 1.0625rem; line-height: 1.55; color: rgba(255,255,255,.82); max-width: 46ch; }
.login__features { display: grid; gap: 14px; margin-top: 36px; }
.login__feature { display: flex; gap: 14px; align-items: flex-start; }
.login__feature-icon {
  width: 38px; height: 38px; flex: none;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(255,255,255,.14);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.18);
}
.login__feature b { display: block; font-weight: 650; }
.login__feature span { font-size: .875rem; color: rgba(255,255,255,.7); line-height: 1.4; }
.login__foot { font-size: .8125rem; color: rgba(255,255,255,.55); }

.login__panel { display: grid; place-items: center; padding: 40px 32px; }
.login__form { width: min(420px, 100%); display: flex; flex-direction: column; gap: 20px; }
.login__demo { display: grid; gap: 8px; }
.login__demo-btn {
  display: flex; align-items: center; gap: 12px;
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--md-sys-shape-corner-medium);
  border: 1px solid var(--md-sys-color-outline-variant);
  background: var(--md-sys-color-surface-container-lowest);
  cursor: pointer;
  text-align: left;
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.login__demo-btn:hover { border-color: var(--md-sys-color-primary); background: var(--md-sys-color-surface-container-low); }
.login__demo-btn b { display: block; font-size: .875rem; }
.login__demo-btn span { font-size: .75rem; color: var(--md-sys-color-on-surface-variant); font-family: var(--md-sys-typescale-font-mono); }

@media (max-width: 960px) {
  .login { grid-template-columns: 1fr; }
  .login__art { display: none; }
}

/* ==========================================================================
   Каркас: navigation rail + content
   ========================================================================== */
.shell {
  display: grid;
  grid-template-columns: var(--lms-rail-width) 1fr;
  grid-template-rows: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}
.shell--expanded { grid-template-columns: var(--lms-rail-width-expanded) 1fr; }

.rail {
  grid-row: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  background: var(--md-sys-color-surface-container);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  overflow: hidden auto;
  z-index: var(--lms-z-nav);
}
.rail__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px 18px;
  min-height: 56px;
}
.rail__mark {
  width: 42px; height: 42px; flex: none;
  display: grid; place-items: center;
  border-radius: 14px;
  color: var(--md-sys-color-on-primary);
  background: linear-gradient(140deg,
    var(--md-sys-color-primary) 0%,
    color-mix(in oklab, var(--md-sys-color-primary) 70%, var(--md-sys-color-tertiary)) 100%);
  box-shadow: 0 4px 12px color-mix(in oklab, var(--md-sys-color-primary) 40%, transparent);
}
.rail__title { min-width: 0; }
.rail__title b { display: block; font-size: 1rem; letter-spacing: -0.01em; white-space: nowrap; }
/* Подпись «Онбординг · Адаптация · Обучение» шире 264px, поэтому
   разрешаем перенос на две строки. */
.rail__title span {
  font-size: .6875rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.3;
  white-space: normal;
  overflow: hidden;
}

/* Свёрнутое меню: текстовые подписи не просто прозрачны, а убраны из
   разметки. Иначе они продолжают занимать ширину, текст вылезает
   за пределы 88px, а рельс получает горизонтальную прокрутку.
   Показываются только в развёрнутом виде. */
.rail__title,
.rail__user-text,
.rail__item-label,
.rail__toggle-label { display: none; }
.shell--expanded .rail__title,
.shell--expanded .rail__user-text { display: block; }
.shell--expanded .rail__item-label { display: inline; }
.shell--expanded .rail__toggle-label { display: inline; }
.shell--expanded .rail__brand,
.shell--expanded .rail__user,
.shell--expanded .rail__toggle { justify-content: flex-start; }
.rail--collapsed .rail__brand,
.rail--collapsed .rail__user,
.rail--collapsed .rail__toggle { justify-content: center; }

.rail__item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 56px;
  padding: 0 14px;
  border: none;
  border-radius: var(--md-sys-shape-corner-full);
  background: transparent;
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  white-space: nowrap;
  width: 100%;
  transition: background-color var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.rail__item .icon { flex: none; }
.rail__item-label { font-size: .875rem; font-weight: 600; }
.rail__item:hover { background: color-mix(in oklab, var(--md-sys-color-on-surface) 8%, transparent); color: var(--md-sys-color-on-surface); }
.rail__item--active {
  color: var(--md-sys-color-on-secondary-container);
  background: var(--md-sys-color-secondary-container);
}
.rail__item--active:hover { background: var(--md-sys-color-secondary-container); }
.rail__item--active::before {
  content: "";
  position: absolute;
  left: -12px; top: 50%;
  width: 4px; height: 28px;
  border-radius: 0 4px 4px 0;
  background: var(--md-sys-color-primary);
  transform: translateY(-50%);
}

.rail__divider { height: 1px; margin: 10px 8px; background: var(--md-sys-color-outline-variant); opacity: .5; }
.rail__spacer { flex: 1; }

.rail__toggle {
  display: flex; align-items: center; gap: 16px;
  height: 48px; padding: 0 14px;
  border: none; border-radius: var(--md-sys-shape-corner-full);
  background: transparent; color: var(--md-sys-color-on-surface-variant);
  cursor: pointer; white-space: nowrap;
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.rail__toggle:hover { background: color-mix(in oklab, var(--md-sys-color-on-surface) 8%, transparent); }
.rail__toggle-label { font-size: .8125rem; font-weight: 600; }
.rail__toggle .icon { transition: transform var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized); }
.shell--expanded .rail__toggle .icon { transform: rotate(180deg); }

.rail__user {
  display: flex; align-items: center; gap: 12px;
  padding: 10px; margin-top: 6px;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-surface-container-high);
  cursor: pointer;
  border: none;
  width: 100%;
  text-align: left;
  white-space: nowrap;
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.rail__user:hover { background: var(--md-sys-color-surface-container-highest); }
.rail__user-text { min-width: 0; }
.rail__user-text b { display: block; font-size: .8125rem; }
.rail__user-text span { font-size: .6875rem; color: var(--md-sys-color-on-surface-variant); }

.rail__badge {
  position: absolute;
  top: 8px; right: 12px;
  min-width: 18px; height: 18px;
  padding: 0 5px;
  display: grid; place-items: center;
  border-radius: 99px;
  background: var(--md-sys-color-error);
  color: var(--md-sys-color-on-error);
  font-size: .625rem; font-weight: 700;
}
.rail--collapsed .rail__badge { top: 6px; right: 8px; }

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; grid-template-rows: 1fr auto; }
  .rail {
    grid-row: 2;
    flex-direction: row;
    gap: 2px;
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
    border-right: none;
    border-top: 1px solid var(--md-sys-color-outline-variant);
    overflow-x: auto;
  }
  .rail__brand, .rail__divider, .rail__spacer, .rail__toggle, .rail__user { display: none; }
  .rail__item { width: auto; flex-direction: column; gap: 2px; height: 60px; padding: 6px 12px; border-radius: 16px; }
  /* в нижней навигации подписи нужны всегда, независимо от состояния меню */
  .rail__item-label { display: inline; opacity: 1; font-size: .625rem; }
  .rail__item--active::before { display: none; }
  .main { grid-row: 1; }
}

/* ==========================================================================
   Основная область
   ========================================================================== */
.main {
  grid-row: 1;
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  overflow: hidden;
}
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  height: var(--lms-topbar-height);
  padding: 0 24px;
  background: color-mix(in oklab, var(--md-sys-color-surface) 82%, transparent);
  backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid color-mix(in oklab, var(--md-sys-color-outline-variant) 60%, transparent);
  z-index: 10;
}
.topbar__title { min-width: 0; }
.topbar__title b { display: block; font-size: 1.25rem; font-weight: 700; letter-spacing: -0.015em; }
.topbar__title span { font-size: .8125rem; color: var(--md-sys-color-on-surface-variant); }
.topbar__actions { display: flex; align-items: center; gap: 6px; margin-left: auto; }

.search {
  position: relative;
  display: flex;
  align-items: center;
  min-width: 220px;
  max-width: 380px;
  flex: 1;
}
.search .icon { position: absolute; left: 12px; width: 20px; height: 20px; color: var(--md-sys-color-on-surface-variant); pointer-events: none; }
.search input {
  width: 100%;
  height: 42px;
  padding: 0 40px 0 40px;
  border-radius: var(--md-sys-shape-corner-full);
  border: 1px solid transparent;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.search input::placeholder { color: var(--md-sys-color-on-surface-variant); }
.search input:focus {
  outline: none;
  background: var(--md-sys-color-surface-container-lowest);
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 1px var(--md-sys-color-primary);
}

.content {
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px 24px 96px;
  scroll-behavior: smooth;
}
.content__inner { max-width: var(--lms-content-max); margin: 0 auto; }
@media (max-width: 700px) {
  .content { padding: 16px 14px 90px; }
  .topbar { padding: 0 14px; gap: 10px; }
  .search { min-width: 0; }
  .topbar__title span { display: none; }
}

/* ==========================================================================
   Заголовок экрана
   ========================================================================== */
.page-head {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.page-head__text { min-width: 0; }
.page-head h1 { font-size: clamp(1.6rem, 2.6vw, 2.1rem); font-weight: 750; letter-spacing: -0.025em; line-height: 1.15; }
.page-head p { margin-top: 6px; color: var(--md-sys-color-on-surface-variant); max-width: 70ch; }
.page-head__actions { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--md-sys-typescale-label-medium-size);
  color: var(--md-sys-color-primary);
  margin-bottom: 8px;
}

/* ==========================================================================
   Статистика
   ========================================================================== */
.stat {
  display: flex; flex-direction: column; gap: 10px;
  padding: 20px;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-surface-container-low);
  overflow: hidden;
  position: relative;
}
.stat__head { display: flex; align-items: center; gap: 12px; }
.stat__value { font-size: 2.25rem; font-weight: 750; letter-spacing: -0.03em; line-height: 1; font-variant-numeric: tabular-nums; }
.stat__label { font-size: .8125rem; color: var(--md-sys-color-on-surface-variant); }
.stat__delta { display: inline-flex; align-items: center; gap: 4px; font-size: .75rem; font-weight: 700; }
.stat__spark { position: absolute; inset-inline: 0; bottom: 0; height: 42px; opacity: .5; pointer-events: none; }

/* ==========================================================================
   Карточка программы
   ========================================================================== */
.program-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-surface-container-low);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized),
              box-shadow var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard);
}
.program-card:hover { transform: translateY(-4px); box-shadow: var(--md-sys-elevation-3); }
.program-card__cover {
  position: relative;
  height: 132px;
  background: linear-gradient(135deg,
    oklch(0.58 0.17 var(--hue, 285)) 0%,
    oklch(0.42 0.16 var(--hue, 285)) 100%);
  color: #fff;
  padding: 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  overflow: hidden;
}
.program-card__cover::after {
  content: "";
  position: absolute;
  width: 220px; height: 220px;
  right: -70px; bottom: -110px;
  border-radius: 50%;
  background: rgba(255,255,255,.14);
}
.program-card__cover .icon-badge { background: rgba(255,255,255,.22); color: #fff; backdrop-filter: blur(6px); }
.program-card__kind {
  position: absolute;
  top: 14px; right: 14px;
  padding: 4px 10px;
  border-radius: 99px;
  background: rgba(0,0,0,.32);
  backdrop-filter: blur(6px);
  font-size: .6875rem; font-weight: 700;
  letter-spacing: .03em;
}
.program-card__body { padding: 16px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.program-card__title { font-size: 1.0625rem; font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; }
.program-card__meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: .75rem; color: var(--md-sys-color-on-surface-variant); }
.program-card__meta span { display: inline-flex; align-items: center; gap: 4px; }
.program-card__foot { padding: 0 16px 16px; display: flex; align-items: center; gap: 10px; }

/* ==========================================================================
   Экран программы / урока
   ========================================================================== */
.split { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 24px; align-items: start; }
@media (max-width: 1180px) { .split { grid-template-columns: 1fr; } }

.curriculum { display: flex; flex-direction: column; }
.curriculum__item {
  position: relative;
  display: flex;
  gap: 16px;
  padding: 14px 16px;
  border-radius: var(--md-sys-shape-corner-medium);
  cursor: pointer;
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
  border: none; background: transparent; text-align: left; width: 100%;
  color: inherit;
}
.curriculum__item:hover { background: color-mix(in oklab, var(--md-sys-color-on-surface) 6%, transparent); }
.curriculum__item--active { background: var(--md-sys-color-secondary-container); }
.curriculum__item--locked { opacity: .48; cursor: not-allowed; }
.curriculum__item--locked:hover { background: transparent; }
.curriculum__index {
  width: 32px; height: 32px; flex: none;
  display: grid; place-items: center;
  border-radius: var(--md-sys-shape-corner-full);
  background: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface-variant);
  font-size: .8125rem; font-weight: 700;
}
.curriculum__item--done .curriculum__index { background: var(--md-sys-color-success-container); color: var(--md-sys-color-on-success-container); }
.curriculum__item--active .curriculum__index { background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); }
.curriculum__line {
  position: absolute;
  left: 32px; top: 46px; bottom: -8px;
  width: 2px;
  background: var(--md-sys-color-outline-variant);
}

/* ==========================================================================
   Видеоплеер
   ========================================================================== */
.player {
  border-radius: var(--md-sys-shape-corner-extra-large);
  overflow: hidden;
  background: #000;
  box-shadow: var(--md-sys-elevation-2);
}
.player__frame { position: relative; aspect-ratio: 16 / 9; background: #000; }
.player__frame video { width: 100%; height: 100%; object-fit: contain; background: #000; }
.player__overlay {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: linear-gradient(180deg, rgba(0,0,0,.15), rgba(0,0,0,.55));
  transition: opacity var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard);
}
.player__overlay--hidden { opacity: 0; pointer-events: none; }
.player__play {
  width: 76px; height: 76px;
  border-radius: 50%;
  border: none;
  display: grid; place-items: center;
  background: color-mix(in oklab, var(--md-sys-color-primary) 88%, transparent);
  color: var(--md-sys-color-on-primary);
  cursor: pointer;
  box-shadow: 0 8px 28px rgba(0,0,0,.4);
  transition: transform var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized);
}
.player__play:hover { transform: scale(1.07); }
.player__badge {
  position: absolute; top: 14px; left: 14px;
  padding: 5px 12px;
  border-radius: 99px;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: .75rem; font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px;
}
.player__segments {
  position: absolute; inset-inline: 14px; bottom: 12px;
  display: flex; gap: 2px; height: 6px; z-index: 2;
}
.player__seg { flex: 1; border-radius: 2px; background: rgba(255,255,255,.28); transition: background-color 200ms; }
.player__seg--watched { background: var(--md-sys-color-primary); }
.player__controls {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}
.player__time { font-size: .8125rem; font-variant-numeric: tabular-nums; color: var(--md-sys-color-on-surface-variant); min-width: 96px; }
.player__scrub { flex: 1; position: relative; height: 24px; display: flex; align-items: center; cursor: pointer; }
.player__scrub-track { width: 100%; height: 6px; border-radius: 99px; background: var(--md-sys-color-surface-container-highest); position: relative; overflow: hidden; }
.player__scrub-watched { position: absolute; inset-block: 0; left: 0; background: color-mix(in oklab, var(--md-sys-color-primary) 45%, transparent); }
.player__scrub-played { position: absolute; inset-block: 0; left: 0; background: var(--md-sys-color-primary); }
.player__scrub-knob {
  position: absolute; top: 50%;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--md-sys-color-primary);
  border: 3px solid var(--md-sys-color-surface-container-high);
  transform: translate(-50%, -50%);
  box-shadow: var(--md-sys-elevation-1);
}
.player__rate {
  border: none; background: transparent; cursor: pointer;
  font-size: .75rem; font-weight: 700;
  color: var(--md-sys-color-primary);
  padding: 4px 8px; border-radius: 8px;
}
.player__rate:hover { background: color-mix(in oklab, var(--md-sys-color-primary) 10%, transparent); }

/* ==========================================================================
   Прогресс по урокам (список у сотрудника)
   ========================================================================== */
.lesson-row {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px;
  border-radius: var(--md-sys-shape-corner-medium);
  background: var(--md-sys-color-surface-container-low);
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.lesson-row:hover { background: var(--md-sys-color-surface-container); }
.lesson-row__main { flex: 1; min-width: 0; }
.lesson-row__title { font-size: .9375rem; font-weight: 600; line-height: 1.35; }
.lesson-row__sub { display: flex; gap: 12px; flex-wrap: wrap; font-size: .75rem; color: var(--md-sys-color-on-surface-variant); margin-top: 4px; }
.lesson-row__right { display: flex; align-items: center; gap: 12px; flex: none; }

/* ==========================================================================
   Документы
   ========================================================================== */
.doc-row {
  display: flex; align-items: center; gap: 16px;
  padding: 16px;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-surface-container-low);
  transition: all var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard);
}
.doc-row:hover { background: var(--md-sys-color-surface-container); box-shadow: var(--md-sys-elevation-1); }
.doc-row__icon { width: 46px; height: 46px; flex: none; display: grid; place-items: center; border-radius: 14px; }
.doc-row__title { font-size: 1rem; font-weight: 650; }
.doc-row__meta { font-size: .75rem; color: var(--md-sys-color-on-surface-variant); display: flex; gap: 12px; flex-wrap: wrap; margin-top: 3px; }

.doc-viewer {
  background: var(--md-sys-color-surface-container-lowest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 28px 32px;
  max-height: 60vh;
  overflow-y: auto;
  font-size: .9375rem;
  line-height: 1.7;
}
.doc-viewer h1 { font-size: 1.5rem; margin-bottom: 14px; letter-spacing: -0.015em; }
.doc-viewer h2 { font-size: 1.125rem; margin: 22px 0 8px; }
.doc-viewer h3 { font-size: 1rem; margin: 18px 0 6px; }
.doc-viewer hr { border: none; border-top: 1px solid var(--md-sys-color-outline-variant); margin: 20px 0; }
.doc-viewer li { margin: 4px 0 4px 18px; list-style: disc; }
.doc-viewer ol { list-style: decimal; }
.doc-viewer strong { font-weight: 700; }
.doc-viewer p { margin: 10px 0; }

/* Файл документа, а не текстовая карточка: свои отступы и высота под файл. */
.doc-viewer--file { padding: 0; max-height: none; overflow: visible; }
.doc-viewer--file .doc-view__text { padding: 28px 32px; max-height: 60vh; overflow-y: auto; }
.doc-view__loader { padding: 40px; display: grid; place-items: center; }
.doc-view__text--plain { font-size: .9375rem; }

/* Текст, извлечённый из .docx: сохраняем разбивку на абзацы и таблицы,
   поэтому показываем как есть, а не прогоняем через markdown-разметку. */
.doc-view__pre {
  margin: 0;
  font: inherit;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.7;
}

/* PDF: встроенный просмотрщик браузера во всю ширину карточки. */
.doc-view__frame {
  display: block;
  width: 100%;
  height: 70vh;
  min-height: 420px;
  border: 0;
  border-radius: var(--md-sys-shape-corner-medium);
  background: var(--md-sys-color-surface-container);
}

/* Картинка документа: показываем целиком, без обрезки, и по клику
   открываем оригинал, иначе мелкий скан не прочитать. */
.doc-view__image-wrap {
  display: grid;
  place-items: center;
  padding: 20px;
  min-height: 220px;
  background: var(--md-sys-color-surface-container);
  border-radius: var(--md-sys-shape-corner-medium);
}
.doc-view__image { max-width: 100%; height: auto; border-radius: 4px; }
.doc-view__image-wrap.is-loaded { padding: 20px; }
.doc-view__image-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  padding: 10px 0 4px;
}

/* ==========================================================================
   Яндекс Диск
   ========================================================================== */
.disk-banner {
  display: flex; align-items: center; gap: 18px;
  padding: 20px 22px;
  border-radius: var(--md-sys-shape-corner-large);
  background: linear-gradient(120deg,
    color-mix(in oklab, var(--md-sys-color-info-container) 90%, transparent),
    color-mix(in oklab, var(--md-sys-color-tertiary-container) 55%, transparent));
  color: var(--md-sys-color-on-info-container);
  flex-wrap: wrap;
}
.disk-banner__mark {
  width: 52px; height: 52px; flex: none;
  display: grid; place-items: center;
  border-radius: 16px;
  background: rgba(255,255,255,.55);
}
.disk-tree { display: flex; flex-direction: column; gap: 2px; }
.disk-node {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px;
  border-radius: var(--md-sys-shape-corner-small);
  cursor: pointer;
  border: none; background: transparent; width: 100%; text-align: left; color: inherit;
  transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}
.disk-node:hover { background: color-mix(in oklab, var(--md-sys-color-on-surface) 7%, transparent); }
.disk-node--active { background: var(--md-sys-color-secondary-container); }

/* ==========================================================================
   Тест
   ========================================================================== */
.quiz__progress { display: flex; gap: 4px; }
.quiz__dot {
  flex: 1; height: 5px; border-radius: 99px;
  background: var(--md-sys-color-surface-container-highest);
  transition: background-color var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-standard);
}
.quiz__dot--current { background: var(--md-sys-color-primary); }
.quiz__dot--done { background: var(--md-sys-color-secondary); }
.quiz__dot--error { background: var(--md-sys-color-error); }
.quiz__option {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px;
  border-radius: var(--md-sys-shape-corner-medium);
  border: 1px solid var(--md-sys-color-outline-variant);
  background: var(--md-sys-color-surface-container-lowest);
  cursor: pointer;
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
  width: 100%;
  text-align: left;
  color: inherit;
}
.quiz__option:hover { border-color: var(--md-sys-color-primary); background: color-mix(in oklab, var(--md-sys-color-primary) 5%, transparent); }
.quiz__option--selected { border-color: var(--md-sys-color-primary); background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); border-width: 2px; }
.quiz__option--correct { border-color: var(--md-sys-color-success); background: var(--md-sys-color-success-container); color: var(--md-sys-color-on-success-container); }
.quiz__option--wrong { border-color: var(--md-sys-color-error); background: var(--md-sys-color-error-container); color: var(--md-sys-color-on-error-container); }
.quiz__letter {
  width: 32px; height: 32px; flex: none;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--md-sys-color-surface-container-high);
  font-weight: 700; font-size: .875rem;
}
.quiz__option--selected .quiz__letter { background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); }

/* ==========================================================================
   Таблица
   ========================================================================== */
.table-wrap { overflow-x: auto; border-radius: var(--md-sys-shape-corner-large); }
.table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.table th {
  text-align: left;
  padding: 12px 16px;
  font-size: var(--md-sys-typescale-label-medium-size);
  color: var(--md-sys-color-on-surface-variant);
  font-weight: 600;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  white-space: nowrap;
  background: var(--md-sys-color-surface-container);
}
.table td { padding: 12px 16px; border-bottom: 1px solid color-mix(in oklab, var(--md-sys-color-outline-variant) 50%, transparent); vertical-align: middle; }
.table tbody tr { transition: background-color var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard); }
.table tbody tr:hover { background: color-mix(in oklab, var(--md-sys-color-on-surface) 4%, transparent); }
.table tbody tr:last-child td { border-bottom: none; }
.table__sortable { cursor: pointer; user-select: none; }
.table__sortable:hover { color: var(--md-sys-color-primary); }

/* ==========================================================================
   Диаграммы
   ========================================================================== */
.bars { display: flex; flex-direction: column; gap: 14px; }
.bar-row { display: flex; flex-direction: column; gap: 6px; }
.bar-row__head { display: flex; align-items: baseline; gap: 10px; font-size: .8125rem; }
.bar-row__head b { font-weight: 600; }
.bar-row__head span { margin-left: auto; color: var(--md-sys-color-on-surface-variant); font-variant-numeric: tabular-nums; }
.bar-track { height: 10px; border-radius: 99px; background: var(--md-sys-color-surface-container-highest); overflow: hidden; }
.bar-fill {
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg,
    color-mix(in oklab, var(--md-sys-color-primary) 70%, var(--md-sys-color-tertiary)),
    var(--md-sys-color-primary));
  transition: width var(--md-sys-motion-duration-extra-long2) var(--md-sys-motion-easing-emphasized);
}

.donut { display: grid; place-items: center; }
.donut svg { transform: rotate(-90deg); }
.donut circle { fill: none; stroke-linecap: round; }
.donut__center { position: absolute; text-align: center; }
.donut__center b { display: block; font-size: 1.5rem; font-weight: 750; letter-spacing: -0.02em; }
.donut__center span { font-size: .75rem; color: var(--md-sys-color-on-surface-variant); }

.legend { display: flex; flex-direction: column; gap: 8px; }
.legend__row { display: flex; align-items: center; gap: 8px; font-size: .8125rem; }
.legend__swatch { width: 12px; height: 12px; border-radius: 4px; flex: none; }
.legend__row span { margin-left: auto; color: var(--md-sys-color-on-surface-variant); font-variant-numeric: tabular-nums; }

.spark-bars { display: flex; align-items: flex-end; gap: 4px; height: 56px; }
.spark-bars__bar { flex: 1; border-radius: 4px 4px 2px 2px; background: var(--md-sys-color-primary); opacity: .85; min-height: 3px; transition: height var(--md-sys-motion-duration-long2) var(--md-sys-motion-easing-emphasized); }

/* ==========================================================================
   Пустое состояние
   ========================================================================== */
.empty {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  padding: 56px 24px;
  text-align: center;
  color: var(--md-sys-color-on-surface-variant);
}
.empty__icon {
  width: 72px; height: 72px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
}
.empty h3 { font-size: 1.125rem; color: var(--md-sys-color-on-surface); font-weight: 650; }
.empty p { max-width: 44ch; font-size: .875rem; line-height: 1.55; }

/* ==========================================================================
   Загрузка
   ========================================================================== */
.loader { display: grid; place-items: center; padding: 80px 0; }
.loader__ring {
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 3px solid var(--md-sys-color-surface-container-highest);
  border-top-color: var(--md-sys-color-primary);
  animation: spin 900ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==========================================================================
   Моноширинный фрагмент (логины, токены, пути)
   ========================================================================== */
.code {
  font-family: var(--md-sys-typescale-font-mono);
  font-size: .8125rem;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  word-break: break-all;
}

/* ==========================================================================
   Баннер-предупреждение (дедлайны, ограничения)
   ========================================================================== */
.banner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--md-sys-shape-large);
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  border-left: 4px solid var(--md-sys-color-primary);
}
.banner--warning {
  background: color-mix(in oklab, var(--md-sys-color-error-container) 60%, var(--md-sys-color-surface));
  border-left-color: var(--md-sys-color-error);
}
.banner--info {
  background: color-mix(in oklab, var(--md-sys-color-info-container) 55%, var(--md-sys-color-surface));
  border-left-color: var(--md-sys-color-info);
}
.banner--success {
  background: color-mix(in oklab, var(--md-sys-color-success-container) 55%, var(--md-sys-color-surface));
  border-left-color: var(--md-sys-color-success);
}

/* ==========================================================================
   Программа: шапка, уроки, определения
   ========================================================================== */
.program-hero {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  background:
    radial-gradient(120% 140% at 0% 0%,
      oklch(0.95 0.035 var(--hue, 262)) 0%,
      transparent 62%),
    var(--md-sys-color-surface-container-low);
}
@media (max-width: 720px) {
  .program-hero { flex-direction: column; }
}

.lesson-index {
  width: 30px; height: 30px; flex: none;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: .8125rem; font-weight: 650;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
}
.lesson-index--active {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}
.lesson-index--done {
  background: var(--md-sys-color-success);
  color: var(--md-sys-color-on-success);
}

.kv { display: grid; gap: 2px; }
.kv__row {
  display: flex; justify-content: space-between; gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  font-size: .875rem;
}
.kv__row:last-child { border-bottom: none; }
.kv dt { color: var(--md-sys-color-on-surface-variant); }
.kv dd { margin: 0; font-weight: 550; text-align: right; }

.swatch {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: none; cursor: pointer;
  transition: transform 120ms ease;
}
.swatch:hover { transform: scale(1.08); }

/* ==========================================================================
   Урок: компоновка и тест
   ========================================================================== */
.lesson {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 22px;
  align-items: start;
}
@media (max-width: 1100px) {
  .lesson { grid-template-columns: minmax(0, 1fr); }
}
.lesson__aside { position: sticky; top: 8px; }
@media (max-width: 1100px) {
  .lesson__aside { position: static; }
}

.player__ctrl {
  min-width: 32px; height: 32px;
  padding: 0 6px;
  border: none; border-radius: 8px;
  display: grid; place-items: center;
  background: transparent;
  color: var(--md-sys-color-on-surface);
  font-size: .75rem; font-weight: 700;
  cursor: pointer;
  transition: background-color 140ms ease;
}
.player__ctrl:hover { background: var(--md-sys-color-surface-container-highest); }
.player__ctrl:focus-visible { outline: 2px solid var(--md-sys-color-primary); outline-offset: 2px; }

.quiz__q {
  padding: 16px 18px;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-surface-container-low);
  border: 1px solid transparent;
}
.quiz__q--right { border-color: var(--md-sys-color-success); }
.quiz__q--wrong { border-color: var(--md-sys-color-error); }
.quiz__num {
  width: 26px; height: 26px; flex: none;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  font-size: .75rem; font-weight: 700;
}
.quiz__opt {
  display: flex; align-items: flex-start; gap: 10px;
  margin-top: 8px; padding: 10px 12px;
  border-radius: var(--md-sys-shape-corner-medium);
  background: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  font-size: .875rem; cursor: pointer;
  transition: background-color 140ms ease, border-color 140ms ease;
}
.quiz__opt:hover { background: var(--md-sys-color-surface-container); }
.quiz__opt input { position: absolute; opacity: 0; pointer-events: none; }
.quiz__mark {
  width: 20px; height: 20px; flex: none; margin-top: 1px;
  border-radius: 50%;
  border: 2px solid var(--md-sys-color-on-surface-variant);
  position: relative;
}
.quiz__opt--checked { border-color: var(--md-sys-color-primary); background: var(--md-sys-color-primary-container); }
.quiz__opt--checked .quiz__mark { border-color: var(--md-sys-color-primary); }
.quiz__opt--checked .quiz__mark::after {
  content: ""; position: absolute; inset: 3px;
  border-radius: 50%; background: var(--md-sys-color-primary);
}
.quiz__opt--right { border-color: var(--md-sys-color-success); background: var(--md-sys-color-success-container); }
.quiz__opt--right .quiz__mark { border-color: var(--md-sys-color-success); }
.quiz__opt--wrong { border-color: var(--md-sys-color-error); background: var(--md-sys-color-error-container); }
.quiz__opt--wrong .quiz__mark { border-color: var(--md-sys-color-error); }