/* ==========================================================================
   Koch School LMS — Shell: сайдбар, топбар, уведомления, drawer, таб-бар,
   раскладки страниц (ученик / сотрудник / урок / сеть)
   ========================================================================== */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  background: var(--bg);
}

/* ---- Сайдбар ----------------------------------------------------------- */

.sidebar {
  position: sticky; top: 0;
  height: 100vh;
  display: flex; flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--bg);
  overflow-y: auto;
  z-index: var(--z-sticky);
}
.sidebar__brand {
  display: flex; align-items: center; gap: 12px;
  height: var(--topbar-h);
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
/* Официальный логотип Koch-Chemie (286×58): в сайдбаре высота 38px. */
.sidebar__logo { display: inline-flex; align-items: center; min-height: 44px; flex: 1; min-width: 0; border-radius: 6px; }
.sidebar__logo img { display: block; width: auto; height: 38px; max-width: 100%; }
.sidebar__logo:focus-visible { outline: var(--focus-ring); outline-offset: 4px; }
.logo { display: inline-flex; align-items: center; border-radius: 6px; }
.logo img { display: block; width: auto; height: var(--logo-h, 29px); }
.logo--lg { --logo-h: 36px; }
.logo--sm { --logo-h: 24px; }
.logo:focus-visible { outline: var(--focus-ring); outline-offset: 4px; }

.sidebar__user {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.sidebar__user-name { font-size: 15px; font-weight: 700; line-height: 1.2; }
.sidebar__user-role { font-size: var(--text-sm); color: var(--fg-2); margin-top: 3px; }
.sidebar__user .avatar { --size: 40px; font-size: 14px; }

.sidebar__nav { padding: 12px; flex: 1; display: flex; flex-direction: column; gap: 4px; }
.sidebar__section { font-size: 11px; font-weight: 700; letter-spacing: var(--tracking-caps); text-transform: uppercase; color: var(--fg-3); padding: 14px 12px 6px; }
.nav-item {
  position: relative;
  display: flex; align-items: center; gap: 12px;
  height: 46px; padding: 0 12px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 400;
  color: var(--fg-2);
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.nav-item .icon { width: 22px; height: 22px; color: var(--fg-3); transition: color var(--dur-fast) var(--ease); }
.nav-item:hover { background: var(--surface); color: var(--fg); }
.nav-item:hover .icon { color: var(--fg); }
.nav-item.is-active { background: var(--surface-2); color: var(--fg); font-weight: 700; }
.nav-item.is-active .icon { color: var(--fg); }
.nav-item.is-active::before {
  content: ''; position: absolute; left: -12px; top: 12px; bottom: 12px;
  width: 3px; border-radius: 0 3px 3px 0; background: var(--fg);
}
.nav-item__label { flex: 1; }
.nav-item .badge--count { height: 18px; min-width: 18px; font-size: 11px; }
.nav-item--soon::after { content: 'скоро'; font-size: 10px; color: var(--fg-3); font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; }
.sidebar__foot { padding: 12px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 2px; }

/* ---- Основная область -------------------------------------------------- */

.main { min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0;
  height: var(--topbar-h);
  display: flex; align-items: center; gap: var(--s-4);
  padding: 0 var(--page-pad);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-sticky);
}
.topbar__title { font-size: 20px; font-weight: 700; letter-spacing: var(--tracking-display); line-height: 1.2; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar__actions { display: flex; align-items: center; gap: var(--s-2); }
.topbar__burger { display: none; }

/* колокольчик */
.bell { position: relative; }
.bell__count {
  position: absolute; top: 2px; right: 0;
  min-width: 16px; height: 16px; padding: 0 3px;
  border-radius: 8px;
  background: var(--fg); color: var(--inverse-fg);
  font-size: 10px; font-weight: 700; line-height: 14px; text-align: center;
  border: 1px solid var(--bg);
  box-sizing: border-box;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
}

.page {
  padding: var(--s-8) var(--page-pad) var(--s-16);
  width: 100%;
  max-width: calc(var(--content-max) + var(--page-pad) * 2);
  margin: 0 auto;
}
.page--wide { max-width: none; }
.page--dense { padding-top: var(--s-6); }
.page-head { margin-bottom: var(--s-8); }
.page-head .h1 { margin-bottom: 6px; }
.page-head__sub { color: var(--fg-2); font-size: var(--text-md); }

/* ---- Панель уведомлений ------------------------------------------------ */

.notif-panel {
  position: absolute; top: calc(100% + 8px); right: 0;
  width: 400px; max-width: calc(100vw - 32px);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-pop);
  z-index: var(--z-dropdown);
  opacity: 0; transform: translateY(-4px) scale(0.98); pointer-events: none;
  transform-origin: top right;
  transition: opacity var(--dur-out) var(--ease), transform var(--dur-out) var(--ease);
  overflow: hidden;
}
.notif-panel.is-open { opacity: 1; transform: none; pointer-events: auto; transition-duration: var(--dur-in); }
.notif-panel__head { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.notif-panel__title { font-size: var(--text-md); font-weight: 700; }
.notif-panel__list { max-height: 440px; overflow-y: auto; }
.notif {
  display: flex; gap: 12px; align-items: flex-start;
  width: 100%; text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
  transition: background-color var(--dur-fast) var(--ease);
}
.notif:last-child { border-bottom: 0; }
.notif:hover { background: var(--surface); }
.notif__icon { width: 32px; height: 32px; border-radius: 8px; background: var(--surface-2); display: grid; place-items: center; color: var(--fg-2); flex-shrink: 0; }
.notif__icon .icon { width: 16px; height: 16px; }
.notif__body { flex: 1; min-width: 0; }
.notif__title { font-size: var(--text-sm); font-weight: 700; line-height: 1.3; display: flex; align-items: center; gap: 8px; }
.notif__text { font-size: var(--text-sm); color: var(--fg-2); margin-top: 2px; line-height: 1.4; }
.notif__time { font-size: var(--text-xs); color: var(--fg-3); margin-top: 4px; }
.notif__arrow { color: var(--fg-3); margin-top: 6px; }
.notif.is-unread .notif__title::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--fg); flex-shrink: 0; }
.notif.is-unread { background: var(--surface); }
.notif.is-unread:hover { background: var(--surface-2); }
.notif-panel__state { padding: 32px 16px; text-align: center; color: var(--fg-2); font-size: var(--text-sm); }
.notif-panel__foot { padding: 10px 16px; border-top: 1px solid var(--border); text-align: center; }

/* ---- Drawer (мобильный, сотрудники) ----------------------------------- */

.drawer-backdrop {
  position: fixed; inset: 0;
  background: rgba(17,17,17,0.4);
  z-index: var(--z-drawer);
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-out) var(--ease);
}
.drawer-backdrop.is-open { opacity: 1; pointer-events: auto; transition-duration: var(--dur-in); }

/* ---- Нижний таб-бар (мобильный, ученики) ------------------------------ */

.tabbar {
  display: none;
  position: fixed; left: 0; right: 0; bottom: 0;
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  z-index: var(--z-sticky);
}
.tabbar__item {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  min-height: var(--tap-min);
  font-size: 11px; font-weight: 700; letter-spacing: 0.01em;
  color: var(--fg-3);
  position: relative;
  transition: color var(--dur-fast) var(--ease);
}
.tabbar__item .icon { width: 22px; height: 22px; }
.tabbar__item.is-active { color: var(--fg); }
.tabbar__item .badge--count { position: absolute; top: 4px; left: calc(50% + 6px); height: 16px; min-width: 16px; padding: 0 3px; line-height: 14px; font-size: 10px; border: 1px solid var(--bg); box-sizing: border-box; pointer-events: none; }

/* ---- Раскладка урока --------------------------------------------------- */

.lesson {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: calc(100vh - var(--topbar-h));
  transition: grid-template-columns var(--dur-in) var(--ease);
}
.lesson.is-collapsed { grid-template-columns: 0 minmax(0, 1fr); }
.syllabus {
  border-right: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  position: sticky; top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  display: flex; flex-direction: column;
}
.lesson.is-collapsed .syllabus { border-right-color: transparent; }
.syllabus__inner { width: 300px; padding: 20px 16px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: var(--s-4); }
.syllabus__head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.syllabus__title { font-size: var(--text-sm); font-weight: 700; letter-spacing: var(--tracking-caps); text-transform: uppercase; color: var(--fg-2); }
.syllabus__progress { display: flex; flex-direction: column; gap: 8px; }
.syllabus__progress-label { display: flex; justify-content: space-between; font-size: var(--text-sm); }
.syl-lesson { display: flex; flex-direction: column; }
.syl-lesson__row {
  display: flex; align-items: center; gap: 10px;
  min-height: 40px; padding: 6px 10px;
  border-radius: 10px;
  font-size: var(--text-sm);
  color: var(--fg-2);
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.syl-lesson__row:hover { background: var(--surface-2); color: var(--fg); }
.syl-lesson.is-current > .syl-lesson__row { color: var(--fg); font-weight: 700; background: var(--bg); box-shadow: 0 0 0 1px var(--border); }
.syl-lesson__num {
  width: 24px; height: 24px; border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: grid; place-items: center;
  font-size: 11px; font-weight: 700; font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.syl-lesson.is-done .syl-lesson__num { background: var(--fg); color: var(--inverse-fg); border-color: var(--fg); }
.syl-lesson.is-done .syl-lesson__num .icon { width: 12px; height: 12px; stroke-width: 2.5; }
.syl-lesson__name { flex: 1; line-height: 1.3; }
.syl-sections { padding: 4px 0 6px 44px; display: flex; flex-direction: column; gap: 2px; }
.syl-section {
  display: flex; align-items: center; gap: 8px;
  min-height: 32px; padding: 0 8px; border-radius: 8px;
  font-size: var(--text-sm); color: var(--fg-2);
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.syl-section:hover { color: var(--fg); background: var(--surface-2); }
.syl-section.is-active { color: var(--fg); font-weight: 700; }
.syl-section .icon { width: 14px; height: 14px; }
.syl-section__check { margin-left: auto; color: var(--success); width: 14px; height: 14px; }
.lesson__content { padding: var(--s-8) var(--page-pad) var(--s-16); }
.lesson__inner { max-width: var(--reading-max); margin: 0 auto; }
.lesson__inner--wide { max-width: 880px; }
.lesson__toggle { display: inline-flex; }
.lesson-nav { display: flex; justify-content: space-between; gap: var(--s-3); padding-top: var(--s-6); margin-top: var(--s-8); border-top: 1px solid var(--border); }

/* ---- Раскладка сети (split pane) -------------------------------------- */

.split {
  display: grid;
  grid-template-columns: minmax(340px, 420px) minmax(0, 1fr);
  height: calc(100vh - var(--topbar-h));
}
.split__left { border-right: 1px solid var(--border); display: flex; flex-direction: column; min-height: 0; background: var(--bg); }
.split__right { min-height: 0; overflow-y: auto; background: var(--surface); }
.split__toolbar { padding: 16px 20px 12px; display: flex; flex-direction: column; gap: 12px; border-bottom: 1px solid var(--border); }
.split__body { flex: 1; overflow-y: auto; padding: 12px 20px 24px; }
.mini-kpis { display: flex; gap: 16px; font-size: var(--text-sm); color: var(--fg-2); flex-wrap: wrap; }
.mini-kpis b { color: var(--fg); font-weight: 700; font-variant-numeric: tabular-nums; }
.inspector { max-width: 880px; padding: var(--s-6) var(--s-8) var(--s-16); }
.inspector__head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--s-4); margin-bottom: var(--s-5); }
.inspector__title { font-size: 24px; font-weight: 700; letter-spacing: var(--tracking-display); line-height: 1.15; }
.inspector__actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.inspector__kpis { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-bottom: var(--s-6); }
.inspector__sections { display: flex; flex-direction: column; gap: 12px; }
.inspector .card { padding: var(--s-5); }
.inspector__back { display: none; }
.rep-card { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--r-field); background: var(--bg); }
.rep-card__name { font-weight: 700; font-size: var(--text-sm); }
.rep-card__meta { font-size: var(--text-xs); color: var(--fg-2); }

/* ---- Главная ученика: раскладки --------------------------------------- */

.home-grid { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: var(--s-6); align-items: start; }
.continue-card {
  display: grid; grid-template-columns: 1fr 280px; gap: var(--s-6);
  padding: var(--s-6);
  border: 1px solid var(--border); border-radius: var(--r-card);
  background: var(--bg);
  position: relative; overflow: hidden;
}
.continue-card__cover { display: block; border-radius: 12px; background: var(--surface-2); min-height: 160px; position: relative; overflow: hidden; border: 1px solid var(--border); }
.continue-card__cover .cover-art { position: absolute; inset: 0; width: 100%; height: 100%; }
.cert-card { display: flex; flex-direction: column; gap: var(--s-3); padding: var(--s-5); border: 1px solid var(--border); border-radius: var(--r-card); background: var(--bg); position: relative; }
.cert-card__code { font-variant-numeric: tabular-nums; letter-spacing: 0.04em; font-size: var(--text-sm); color: var(--fg-2); }
.cert-card__seal { position: absolute; top: 20px; right: 20px; width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border-strong); display: grid; place-items: center; color: var(--fg-2); }

/* ---- Проверка заданий: раскладка -------------------------------------- */

.filters { display: flex; gap: 10px; align-items: end; flex-wrap: wrap; }
.filters .field { min-width: 160px; flex: 1 1 160px; }
.filters .field--search { flex: 2 1 240px; }
.hw-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--s-4); padding: var(--s-4) var(--s-5); border: 1px solid var(--border); border-radius: var(--r-card); background: var(--bg); align-items: start; }
.hw-card__head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.hw-card__lesson { font-weight: 700; }
.hw-card__question { font-size: var(--text-sm); color: var(--fg-2); margin-bottom: 8px; }
.hw-card__answer { font-size: var(--text-sm); line-height: 1.5; padding: 10px 12px; background: var(--surface); border-radius: 10px; border-left: 0; }
.hw-card__meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: var(--text-xs); color: var(--fg-2); margin-top: 10px; }
.hw-card__meta b { color: var(--fg); font-weight: 700; }
.hw-card__side { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }

/* ==========================================================================
   МОБИЛЬНЫЙ (≤768px)
   ========================================================================== */

@media (max-width: 768px) {
  :root { --page-pad: var(--page-pad-mobile); --topbar-h: 56px; }

  .app { grid-template-columns: minmax(0, 1fr); }

  /* сайдбар → drawer */
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    width: min(320px, 86vw); height: 100vh;
    transform: translateX(-100%);
    transition: transform var(--dur-out) var(--ease);
    z-index: calc(var(--z-drawer) + 1);
    box-shadow: none;
  }
  .sidebar.is-open { transform: none; transition-duration: var(--dur-in); box-shadow: var(--shadow-modal); }
  .sidebar__close { display: grid; margin-left: auto; }
  .nav-item { height: 44px; font-size: var(--text-md); }

  .topbar { padding: 0 var(--page-pad); gap: var(--s-2); }
  .topbar__title { font-size: 18px; }
  .topbar__burger { display: inline-flex; }
  .app--student .topbar__burger { display: none; }

  .page { padding: var(--s-5) var(--page-pad) calc(var(--tabbar-h) + var(--s-10)); }
  .page-head { margin-bottom: var(--s-6); }
  .h1 { font-size: 26px; }

  /* таб-бар только у ученика */
  .app--student .tabbar { display: flex; }
  .app--student .sidebar { display: none; }

  .notif-panel { position: fixed; top: var(--topbar-h); left: 12px; right: 12px; width: auto; max-width: none; transform-origin: top center; }
  .notif-panel__list { max-height: calc(100vh - var(--topbar-h) - 140px); }

  /* урок */
  .lesson, .lesson.is-collapsed { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  .syllabus {
    position: fixed; inset: var(--topbar-h) 0 0 0; height: auto;
    width: 100%; transform: translateX(-100%);
    transition: transform var(--dur-out) var(--ease);
    z-index: var(--z-drawer);
    background: var(--bg);
    border-right: 0;
  }
  .lesson:not(.is-collapsed) .syllabus { transform: none; transition-duration: var(--dur-in); }
  .syllabus__inner { width: 100%; padding: 16px; }
  .lesson__content { padding: var(--s-5) var(--page-pad) calc(var(--tabbar-h) + var(--s-10)); }
  .author-bar { padding: 8px var(--page-pad); font-size: var(--text-xs); }
  .author-bar .author-bar__label { width: 100%; margin: 0 0 4px; }
  .lesson-nav { flex-direction: column; }
  .lesson-nav .btn { width: 100%; }

  /* сеть */
  .split { grid-template-columns: minmax(0, 1fr); height: auto; min-height: calc(100vh - var(--topbar-h)); }
  .split__left { border-right: 0; }
  .split__right {
    position: fixed; inset: var(--topbar-h) 0 0 0;
    transform: translateX(100%);
    transition: transform var(--dur-out) var(--ease);
    z-index: var(--z-drawer);
    background: var(--bg);
  }
  .split.is-inspecting .split__right { transform: none; transition-duration: var(--dur-in); }
  .split__body { overflow: visible; }
  .inspector { padding: var(--s-4) var(--page-pad) var(--s-12); }
  .inspector__back { display: inline-flex; margin-bottom: var(--s-3); }
  .inspector__kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .inspector__kpis .kpi:first-child { grid-column: 1 / -1; }
  .inspector__kpis .kpi { padding: 10px 12px; }
  .inspector__kpis .kpi__value { font-size: 22px; white-space: nowrap; }
  .inspector__title { font-size: 20px; }
  .inspector .card { padding: var(--s-4); }

  /* главная ученика */
  .home-grid { grid-template-columns: minmax(0, 1fr); gap: var(--s-6); }
  .continue-card { grid-template-columns: minmax(0, 1fr); padding: var(--s-5); }
  .continue-card__cover { order: -1; min-height: 140px; }

  /* проверка заданий */
  .hw-card { grid-template-columns: minmax(0, 1fr); }
  .hw-card__side { flex-direction: row; align-items: center; justify-content: space-between; }
  .filters .field { flex: 1 1 100%; }
  .table-wrap { overflow-x: auto; }

  .kv { grid-template-columns: 1fr; gap: 2px; }
  .kv dd + dt { margin-top: 10px; }
}

@media (min-width: 769px) {
  .sidebar__close { display: none; }
  .tabbar { display: none; }
}

@media (max-width: 1100px) and (min-width: 769px) {
  .home-grid { grid-template-columns: minmax(0, 1fr); }
  .split { grid-template-columns: minmax(300px, 340px) minmax(0, 1fr); }
  .inspector { padding: var(--s-5) var(--s-6) var(--s-12); }
}