/* Связь во время урока: постоянная панель и раскрывающиеся разделы. */
.room-with-comms {
  --comms-edge: 14px;
  --comms-rail-width: 72px;
  --comms-panel-width: 360px;
  --comms-panel-gap: 6px;
  --comms-control-size: 32px;
  padding-right: calc(var(--comms-rail-width) + 28px);
}

.room-with-comms .room-topbar {
  position: relative;
  z-index: 45;
  margin-right: calc((var(--comms-rail-width) + 28px) * -1);
  padding-right: 22px;
}

/* Постоянная чёрная панель справа. */
.lesson-comms-rail {
  position: fixed;
  z-index: 47;
  top: calc(var(--topbar-h) + 16px);
  right: var(--comms-edge);
  bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: var(--comms-rail-width);
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  background: var(--ink-900);
  box-shadow: 0 18px 46px rgba(14, 14, 13, 0.2);
}

.lesson-comms-rail button {
  border: 0;
  cursor: pointer;
}

.lesson-comms-tab {
  position: relative;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 5px;
  width: 54px;
  min-height: 58px;
  padding: 6px 2px;
  border-radius: 13px;
  background: transparent;
  color: rgba(255, 255, 255, 0.66);
  transition: background 150ms var(--ease), color 150ms var(--ease);
}

.lesson-comms-tab:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--paper-0);
}

.lesson-comms-tab.has-notification:not(.is-active) {
  background: rgba(232, 185, 35, 0.14);
  color: var(--gold-500);
  box-shadow: inset -3px 0 0 var(--gold-500), -5px 0 18px rgba(232, 185, 35, 0.16);
  animation: comms-tab-notification 650ms var(--ease);
}

.lesson-comms-tab.has-notification:not(.is-active) .lesson-comms-tab-icon {
  animation: comms-tab-icon-notification 650ms var(--ease);
}

@keyframes comms-tab-notification {
  0%, 100% { background: rgba(232, 185, 35, 0.14); }
  45% { background: rgba(232, 185, 35, 0.3); }
}

@keyframes comms-tab-icon-notification {
  0%, 100% { transform: scale(1); }
  45% { transform: scale(1.14); }
}

.lesson-comms-tab.is-active {
  background: var(--gold-500);
  color: var(--ink-900);
  box-shadow: -6px 0 18px rgba(232, 185, 35, 0.18);
  transform: translateX(-4px);
}

.lesson-comms-tab:active {
  transform: none;
}

.lesson-comms-tab.is-active:active {
  transform: translateX(-4px);
}

.lesson-comms-tab-icon {
  position: relative;
  display: grid;
  place-items: center;
  width: 26px;
  height: 24px;
}

.lesson-comms-tab-icon svg {
  width: 23px;
  height: 23px;
  stroke-width: 1.8;
}

.lesson-comms-tab small {
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
}

.lesson-comms-tab-icon b {
  position: absolute;
  top: -7px;
  right: -10px;
  display: grid;
  place-items: center;
  min-width: 19px;
  height: 19px;
  padding: 0 4px;
  border: 2px solid var(--ink-900);
  border-radius: 10px;
  background: var(--gold-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1;
}

/* Пустой бейдж прячем: display:grid выше перебивает атрибут hidden, возвращаем его. */
.lesson-comms-tab-icon b[hidden] {
  display: none;
}

.lesson-comms-tab.is-active .lesson-comms-tab-icon b {
  border-color: var(--gold-500);
  background: var(--ink-900);
  color: var(--gold-500);
}

.lesson-comms-separator {
  display: block;
  width: 30px;
  height: 1px;
  margin: 5px auto 6px;
  background: rgba(255, 255, 255, 0.12);
}

/* В узкой панели оставляем только несколько участников. Полный список находится внутри. */
.lesson-comms-people {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-height: 0;
  overflow: hidden;
}

.lesson-comms-person {
  position: relative;
  display: none;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  padding: 0;
  border-radius: 50%;
  background: transparent;
  color: inherit;
}

.lesson-comms-person.is-quick-visible {
  display: grid;
}

.lesson-comms-person.is-speaking {
  order: -1;
}

/* Последний кружок показывает количество скрытых участников. */
.lesson-comms-rail .lesson-comms-more {
  display: grid;
  place-items: center;
  order: 100;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  padding: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.78);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
}

.lesson-comms-rail .lesson-comms-more:hover {
  background: rgba(255, 255, 255, 0.11);
  color: var(--paper-0);
}

.lesson-comms-rail .lesson-comms-more[hidden] {
  display: none;
}

.lesson-comms-person .ava {
  width: 36px;
  height: 36px;
  border: 1px solid transparent;
  background: var(--paper-50);
  color: var(--ink-900);
  font-size: 10px;
  transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.lesson-comms-person:hover .ava {
  border-color: rgba(240, 188, 24, 0.72);
}

.lesson-comms-person.is-speaking .ava {
  border-color: var(--live-500);
  box-shadow: 0 0 0 3px rgba(90, 143, 78, 0.2);
}

.lesson-comms-person.is-speaking::after {
  content: "";
  position: absolute;
  right: 2px;
  bottom: 2px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--ink-900);
  border-radius: 50%;
  background: var(--live-500);
}

/* Общая кнопка собственного микрофона. */
.lesson-comms-own-mic {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  flex: 0 0 50px;
  margin: auto auto 0;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  background: rgba(180, 122, 42, 0.14);
  color: #d99a47;
  transition: background 150ms var(--ease), color 150ms var(--ease), border-color 150ms var(--ease);
}

.lesson-comms-own-mic:hover {
  background: rgba(180, 122, 42, 0.22);
}

.lesson-comms-own-mic.is-on {
  border-color: var(--live-500);
  background: var(--live-500);
  color: var(--paper-0);
}

.lesson-comms-own-mic svg {
  width: 19px;
  height: 19px;
}

.lesson-comms-own-mic.is-on .lesson-comms-mic-off,
.lesson-comms-own-mic.is-off .lesson-comms-mic-on,
.lesson-comms-mic-loading,
.lesson-comms-mic-error {
  display: none;
}

.lesson-comms-own-mic[data-voice-state="reconnecting"] .lesson-comms-mic-on,
.lesson-comms-own-mic[data-voice-state="reconnecting"] .lesson-comms-mic-off,
.lesson-comms-own-mic[data-voice-state="disconnected"] .lesson-comms-mic-on,
.lesson-comms-own-mic[data-voice-state="disconnected"] .lesson-comms-mic-off {
  display: none;
}

.lesson-comms-own-mic[data-voice-state="reconnecting"] .lesson-comms-mic-loading,
.lesson-comms-own-mic[data-voice-state="disconnected"] .lesson-comms-mic-error {
  display: block;
}

.lesson-comms-own-mic[data-voice-state="reconnecting"] .lesson-comms-mic-loading {
  animation: lesson-comms-spin 900ms linear infinite;
}

@keyframes lesson-comms-spin {
  to { transform: rotate(360deg); }
}

/* Раскрывающийся раздел немного заходит под панель и выглядит её продолжением. */
.lesson-comms-panel {
  position: fixed;
  z-index: 46;
  top: var(--comms-panel-top, calc(var(--topbar-h) + 16px));
  right: calc(var(--comms-edge) + var(--comms-rail-width) - var(--comms-panel-gap));
  display: block;
  width: var(--comms-panel-width);
  max-height: calc(100dvh - var(--comms-panel-top, calc(var(--topbar-h) + 16px)) - 16px);
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: 17px 0 17px 17px;
  background: var(--paper-0);
  box-shadow: 0 18px 48px rgba(25, 23, 18, 0.18);
  opacity: 0;
  pointer-events: none;
  transform: translateX(12px) scale(0.99);
  transform-origin: right top;
  transition: transform 180ms var(--ease), opacity 140ms var(--ease);
}

.lesson-comms-panel.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0) scale(1);
}

.lesson-comms-panel[data-active-view="chat"] {
  height: min(500px, calc(100dvh - var(--comms-panel-top) - 16px));
}

.lesson-comms-view {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
  max-height: inherit;
  overflow: hidden;
}

.lesson-comms-view[hidden] {
  display: none !important;
}

.lesson-comms-view-chat {
  height: 100%;
}

/* Общая шапка разделов. */
.lesson-comms-head {
  position: relative;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  min-height: 70px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--hairline);
  background: var(--paper-0);
}

.lesson-comms-head-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--hairline);
  border-radius: 11px;
  background: var(--paper-50);
  color: var(--text-2);
}

.lesson-comms-head-icon svg {
  width: 17px;
  height: 17px;
  stroke-width: 1.8;
}

.lesson-comms-head-copy {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.lesson-comms-head strong {
  display: block;
  color: var(--text-1);
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.1;
}

.lesson-comms-head small {
  color: var(--text-3);
  font-size: 10px;
  line-height: 1.3;
}

.lesson-comms-head-count {
  grid-column: 3;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 10px;
  border-radius: 10px;
  background: var(--gold-50);
  color: var(--gold-700);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.lesson-comms-head-count::after {
  content: "на уроке";
  margin-left: 5px;
  color: var(--text-3);
  font-family: var(--font-sans);
  font-size: 8.5px;
  font-weight: 600;
}

/* Участники выглядят как один список, а не набор отдельных карточек. */
.lesson-voice-list {
  display: grid;
  align-content: start;
  gap: 0;
  min-height: 0;
  max-height: min(410px, calc(100dvh - var(--comms-panel-top, calc(var(--topbar-h) + 16px)) - 86px));
  margin: 0;
  padding: 5px 14px 11px;
  overflow-y: auto;
  border: 0;
  border-radius: 0;
  background: var(--paper-50);
  box-shadow: none;
  scrollbar-width: thin;
  scrollbar-color: var(--paper-200) transparent;
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
}

.lesson-voice-list::-webkit-scrollbar {
  width: 6px;
}

.lesson-voice-list::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 6px;
  background: var(--paper-200);
  background-clip: content-box;
}

.lesson-voice-list::after {
  content: "На уроке";
  order: 0;
  justify-self: start;
  margin: 6px 0 5px;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--live-50);
  color: var(--live-500);
  font-size: 8.5px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.lesson-voice-person.is-present {
  order: 1;
}

.lesson-voice-list:has(.lesson-voice-person.is-absent)::before {
  content: "Не на уроке";
  order: 2;
  justify-self: start;
  margin: 10px 0 5px;
  padding: 4px 8px;
  border-top: 0;
  border-radius: 8px;
  background: var(--paper-100);
  color: var(--text-3);
  font-size: 8.5px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.lesson-voice-person.is-absent {
  order: 3;
}

.lesson-voice-person {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 60px;
  padding: 9px 3px;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  transition: background 130ms var(--ease), opacity 130ms var(--ease);
}

.lesson-voice-person::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 44px;
  height: 1px;
  background: var(--hairline);
}

.lesson-voice-person:hover {
  background: var(--paper-0);
}

.lesson-voice-person > .ava {
  position: relative;
  width: 34px;
  height: 34px;
  border: 1px solid var(--hairline);
  background: var(--paper-0);
  color: var(--text-1);
  font-size: 10px;
}

.lesson-voice-person > .ava::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--paper-50);
  border-radius: 50%;
  background: var(--live-500);
}

.lesson-voice-person.is-absent > .ava::after {
  background: var(--paper-200);
}

.lesson-voice-person.is-current-user,
.lesson-voice-person.is-speaking {
  background: transparent;
}

.lesson-voice-person.is-speaking .lesson-voice-person-info strong {
  color: var(--live-500);
}

.lesson-voice-list .lesson-voice-person.is-absent {
  background: transparent;
  opacity: 0.4;
}

/* Понятное сообщение вместо молчаливой ошибки микрофона или автозапуска звука. */
.lesson-voice-notice {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  margin: 10px 14px 4px;
  padding: 9px 10px;
  border: 1px solid rgba(180, 122, 42, 0.22);
  border-radius: 10px;
  background: var(--warn-50);
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.35;
}

.lesson-voice-notice[hidden] {
  display: none;
}

.lesson-voice-notice > svg {
  width: 16px;
  height: 16px;
  color: var(--warn-500);
}

.lesson-voice-notice button {
  padding: 6px 9px;
  border: 0;
  border-radius: 8px;
  background: var(--ink-900);
  color: var(--paper-0);
  font: inherit;
  font-weight: 700;
}

.lesson-voice-person.is-absent .lesson-voice-actions,
.lesson-voice-person.is-absent .lesson-voice-state,
.lesson-voice-person.is-absent .lesson-voice-volume,
.lesson-voice-person:not(.is-in-voice) .lesson-voice-actions,
.lesson-voice-person:not(.is-in-voice) .lesson-voice-state,
.lesson-voice-person:not(.is-in-voice) .lesson-voice-volume {
  display: none;
}

.lesson-voice-person-info {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.lesson-voice-person-info strong {
  overflow: hidden;
  color: var(--text-1);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-voice-person-info small {
  color: var(--text-3);
  font-size: 9.5px;
  line-height: 1.2;
}

.lesson-voice-end {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  min-width: 32px;
}

/* Индикатор речи занимает место постоянно, поэтому строки не двигаются. */
.lesson-voice-speaking {
  display: inline-flex;
  align-items: end;
  justify-content: center;
  gap: 2px;
  width: 18px;
  height: 18px;
  padding: 3px;
  color: var(--live-500);
  visibility: hidden;
}

.lesson-voice-person.is-speaking .lesson-voice-speaking {
  visibility: visible;
}

.lesson-voice-speaking i {
  display: block;
  width: 2px;
  border-radius: 2px;
  background: currentColor;
}

.lesson-voice-person.is-speaking .lesson-voice-speaking i {
  animation: lesson-speaking-bars 720ms ease-in-out infinite alternate;
}

.lesson-voice-speaking i:nth-child(1) { height: 6px; }
.lesson-voice-speaking i:nth-child(2) { height: 12px; animation-delay: -240ms; }
.lesson-voice-speaking i:nth-child(3) { height: 8px; animation-delay: -480ms; }

@keyframes lesson-speaking-bars {
  to { height: 4px; }
}

.lesson-voice-problem {
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--comms-control-size);
  height: var(--comms-control-size);
  flex: 0 0 var(--comms-control-size);
  border-radius: 9px;
  background: var(--warn-50);
  color: var(--warn-500);
}

.lesson-voice-problem svg {
  width: 14px;
  height: 14px;
}

.lesson-voice-person.is-present:not(.is-in-voice) .lesson-voice-problem {
  display: inline-flex;
  opacity: 0;
  animation: lesson-show-voice-problem 0s 5s forwards;
}

@keyframes lesson-show-voice-problem {
  to { opacity: 1; }
}

.lesson-voice-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px;
  border: 1px solid var(--hairline);
  border-radius: 12px;
  background: var(--paper-0);
}

.lesson-voice-state,
.lesson-voice-mic-indicator,
.lesson-voice-mute {
  display: grid;
  place-items: center;
  width: var(--comms-control-size);
  height: var(--comms-control-size);
  flex: 0 0 var(--comms-control-size);
  padding: 0;
  border: 1px solid transparent;
  border-radius: 10px;
  background: var(--paper-100);
  color: var(--text-3);
}

.lesson-voice-mute {
  cursor: pointer;
}

.lesson-voice-mute:not(:disabled):hover {
  border-color: rgba(90, 143, 78, 0.28);
  background: var(--live-50);
}

.lesson-voice-state svg,
.lesson-voice-mic-indicator svg,
.lesson-voice-mute svg {
  width: 15px;
  height: 15px;
}

.lesson-voice-person.is-mic-on .lesson-voice-state,
.lesson-voice-person.is-mic-on .lesson-voice-mic-indicator,
.lesson-voice-person.is-mic-on .lesson-voice-mute {
  border-color: rgba(90, 143, 78, 0.24);
  background: var(--live-50);
  color: var(--live-500);
}

.lesson-voice-mute:disabled {
  cursor: default;
}

.lesson-voice-mute-on,
.lesson-voice-person.is-mic-on .lesson-voice-mute-off {
  display: none;
}

.lesson-voice-person.is-mic-on .lesson-voice-mute-on {
  display: block;
}

.lesson-voice-volume-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 60px;
  height: var(--comms-control-size);
  padding: 0 7px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: var(--paper-0);
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 9px;
  cursor: pointer;
  transition: background 130ms var(--ease), border-color 130ms var(--ease);
}

.lesson-voice-volume-button:hover {
  border-color: var(--gold-500);
  background: var(--gold-50);
}

.lesson-voice-volume-button svg {
  width: 13px;
  height: 13px;
}

.lesson-voice-volume-button.is-volume-low svg path:nth-of-type(n + 2),
.lesson-voice-volume.is-volume-low > svg path:nth-of-type(n + 2) {
  display: none;
}

.lesson-voice-volume-button.is-volume-medium svg path:nth-of-type(3),
.lesson-voice-volume.is-volume-medium > svg path:nth-of-type(3) {
  display: none;
}

/* Регулятор открывается в верхнем слое браузера и не обрезается панелью. */
.lesson-voice-volume[popover] {
  position: fixed;
  inset: auto;
  z-index: 100;
  grid-template-columns: 32px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 10px;
  width: 224px;
  min-height: 58px;
  margin: 0;
  padding: 10px 11px;
  border: 1px solid var(--hairline);
  border-radius: 15px;
  background: var(--paper-0);
  box-shadow: 0 16px 40px rgba(25, 23, 18, 0.2);
  opacity: 0;
  transform: translateX(6px) scale(0.98);
}

.lesson-voice-volume[popover]:popover-open {
  display: grid;
  opacity: 1;
  transform: translateX(0) scale(1);
  animation: lesson-volume-open 140ms var(--ease);
}

.lesson-voice-volume[popover]::backdrop {
  background: transparent;
}

@keyframes lesson-volume-open {
  from {
    opacity: 0;
    transform: translateX(6px) scale(0.98);
  }
}

.lesson-voice-volume strong {
  grid-column: 3;
  justify-self: end;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 10px;
}

.lesson-voice-volume > svg {
  grid-column: 1;
  grid-row: 1;
  box-sizing: border-box;
  width: 32px;
  height: 32px;
  padding: 8px;
  border-radius: 9px;
  background: var(--gold-50);
  color: var(--gold-700);
}

.lesson-voice-volume input {
  grid-column: 2;
  grid-row: 1;
  width: 100%;
  height: 18px;
  margin: 0;
  padding: 0;
  appearance: none;
  border: 0;
  outline: 0;
  background: transparent;
  cursor: pointer;
}

.lesson-voice-volume input::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(
    to right,
    var(--gold-500) 0 var(--volume-progress, 50%),
    var(--paper-200) var(--volume-progress, 50%) 100%
  );
}

.lesson-voice-volume input::-webkit-slider-thumb {
  width: 17px;
  height: 17px;
  margin-top: -6.5px;
  appearance: none;
  border: 3px solid var(--paper-0);
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 1px 5px rgba(25, 23, 18, 0.28);
}

.lesson-voice-volume input::-moz-range-track {
  height: 4px;
  border-radius: 4px;
  background: var(--paper-200);
}

.lesson-voice-volume input::-moz-range-progress {
  height: 4px;
  border-radius: 4px;
  background: var(--gold-500);
}

.lesson-voice-volume input::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 3px solid var(--paper-0);
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 1px 5px rgba(25, 23, 18, 0.28);
}

/* В чате прокручиваются только сообщения, а шапка и форма остаются на месте. */
.lesson-comms-chat,
.lesson-comms-chat > * {
  min-height: 0;
}

.lesson-comms-chat {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background: var(--paper-0);
}

.lesson-comms-chat .lesson-chat-head {
  display: none;
}

.lesson-comms-chat .lesson-chat-feed {
  flex: 1;
  gap: 6px;
  padding: 12px 13px;
  overflow-y: auto;
  scroll-behavior: auto;
  background: var(--paper-50);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.lesson-comms-chat .lesson-chat-feed::-webkit-scrollbar {
  display: none;
  width: 0;
}

.lesson-comms-chat .lesson-chat-unread {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 7px 0 5px;
  color: var(--gold-700);
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}

.lesson-comms-chat .lesson-chat-unread::before,
.lesson-comms-chat .lesson-chat-unread::after {
  content: "";
  width: 100%;
  height: 1px;
  background: var(--gold-300);
}

.lesson-comms-chat .lesson-chat-message {
  gap: 7px;
  max-width: 92%;
}

.lesson-comms-chat .lesson-chat-message .ava {
  width: 27px;
  height: 27px;
  font-size: 9px;
}

.lesson-comms-chat .lesson-chat-message-body {
  padding: 8px 10px 7px;
  border: 1px solid var(--hairline);
  border-radius: 12px;
  background: var(--paper-0);
  box-shadow: none;
}

.lesson-comms-chat .lesson-chat-message.is-own .lesson-chat-message-body {
  border-color: var(--gold-500);
  background: var(--gold-500);
}

.lesson-comms-chat .lesson-chat-message-name {
  font-size: 10px;
}

.lesson-comms-chat .lesson-chat-message-text {
  font-size: 12px;
  line-height: 1.4;
}

/* Две колонки: поле ввода на всю ширину + кнопка «отправить». */
.lesson-comms-chat .lesson-chat-form {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 10px;
  border-top: 1px solid var(--hairline);
  background: var(--paper-0);
}

.lesson-comms-chat .lesson-chat-compose-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 7px;
}

.lesson-comms-chat .lesson-chat-composer-context {
  padding: 6px 7px;
}

.lesson-comms-chat .lesson-chat-tool,
.lesson-comms-chat .lesson-chat-send {
  width: 38px;
  height: 38px;
  border-radius: 11px;
}

.lesson-comms-chat .lesson-chat-tool {
  border-color: transparent;
  background: var(--paper-50);
}

.lesson-comms-chat .lesson-chat-input-wrap {
  min-width: 0;
  padding-left: 12px;
  border: 1px solid var(--hairline);
  border-radius: 11px;
  background: var(--paper-50);
}

.lesson-comms-chat .lesson-chat-input-wrap input {
  min-width: 0;
  padding: 9px 0;
  font-size: 12px;
}

/* Учитель открывает видеосессию отдельно от постоянно работающего голоса. */
.lesson-video-session-form {
  margin: 0;
}

.lesson-video-session-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 36px;
  padding: 0 11px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-on-ink-1);
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.lesson-video-session-toggle:hover {
  border-color: rgba(232, 185, 35, 0.42);
  background: rgba(232, 185, 35, 0.13);
}

.lesson-video-session-toggle.is-active {
  border-color: rgba(213, 102, 82, 0.45);
  background: rgba(213, 102, 82, 0.14);
}

.lesson-video-session-toggle svg {
  width: 15px;
  height: 15px;
}

.lesson-video-session-stop-icon,
.lesson-video-session-toggle.is-active .lesson-video-session-start-icon {
  display: none;
}

.lesson-video-session-toggle.is-active .lesson-video-session-stop-icon {
  display: block;
}

.lesson-video-head-count {
  justify-self: end;
  padding: 6px 9px;
  border-radius: 9px;
  background: var(--paper-100);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  white-space: nowrap;
}

.lesson-video-call {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 0;
  overflow: hidden;
  background: #171714;
}

/* ============================================================
   ВИДЕОЗВОНОК — панель сцены (большой экран для проверки артикуляции)
   ============================================================ */

/* Вкладка «Видео» появляется, только когда учитель включил видеосвязь. */
.scene-tab-video {
  display: none;
}

.room-with-comms.is-video-active .scene-tab-video {
  display: inline-flex;
}

/* Панель видео без отступов; заполняет область сцены, только когда есть камеры. */
[data-scene-panel="video"] {
  padding: 0;
  overflow: hidden;
  height: 100%;
}

.scene-video {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100%;
  min-height: 0;
  background: #171714;
}

/* Пока камер нет — панель компактная (не растянута на весь экран). */
[data-scene-panel="video"]:not(:has(.lesson-video-tile)),
[data-scene-panel="video"]:not(:has(.lesson-video-tile)) .scene-video {
  height: auto;
}

/* В полноэкранном режиме видео всегда заполняет область. */
.room-with-comms.is-scene-focus [data-scene-panel="video"],
.room-with-comms.is-scene-focus [data-scene-panel="video"] .scene-video {
  height: 100%;
}

/* Крупные плитки: одну ученицу удобно развернуть кликом на весь экран. */
.scene-video-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  padding: 14px;
}

/* Плитки по центру области, а не прижаты к верху (убирает пустоту над панелью).
   safe center — при переполнении откатывается к верху и скроллится. */
.scene-video .scene-video-grid {
  align-content: safe center;
}

/* Компактный плейсхолдер, когда ещё никто не включил камеру. */
.scene-video .lesson-video-empty {
  min-height: 150px;
}

.scene-video-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding: 11px 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: #1e1e1a;
  color: rgba(255, 255, 255, 0.72);
  font-size: 12px;
}

.scene-video-camera-label {
  color: rgba(255, 255, 255, 0.82);
}

.scene-video-count {
  padding: 5px 9px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
}

/* HD-тумблер учителя (переключатель + подпись) прижат к правому краю. */
.scene-video-hd-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
  margin-left: auto;
}

.scene-video-hd {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.scene-video-hd input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.scene-video-hd-track {
  position: relative;
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.22);
  transition: background 150ms var(--ease);
}

.scene-video-hd-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  transition: transform 150ms var(--ease);
}

.scene-video-hd input:checked + .scene-video-hd-track {
  background: var(--live-500);
}

.scene-video-hd input:checked + .scene-video-hd-track::after {
  transform: translateX(16px);
}

.scene-video-hd input:disabled + .scene-video-hd-track {
  opacity: 0.55;
}

.scene-video-hd-text {
  color: var(--paper-0);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.scene-video-hd-note {
  margin: 0;
  color: rgba(255, 255, 255, 0.45);
  font-size: 10px;
  line-height: 1.3;
  text-align: right;
}

/* Кнопка демонстрации экрана. */
.lesson-video-screen {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--paper-0);
  cursor: pointer;
}

.lesson-video-screen svg {
  width: 17px;
  height: 17px;
}

.lesson-video-screen.is-active {
  border-color: var(--live-500);
  background: var(--live-500);
  color: #fff;
}

.lesson-video-screen:disabled {
  cursor: default;
  opacity: 0.55;
}

/* Экран заменяет камеру внутри той же плитки участника. */
.lesson-video-tile.is-screen-source {
  aspect-ratio: 16 / 9;
}

.lesson-video-screen.is-unavailable:not(.is-active) {
  border-style: dashed;
  color: rgba(255, 255, 255, 0.42);
}

.lesson-video-tile.is-screen-source .lesson-video-media video {
  object-fit: contain;
  background: #000;
  transform: none;
}

.lesson-video-source {
  display: none;
  flex: 0 0 auto;
  padding: 3px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.72);
  font-size: 8px;
  font-weight: 700;
}

.lesson-video-tile.has-video .lesson-video-source {
  display: inline-flex;
}

.lesson-video-tile.is-screen-source .lesson-video-source {
  background: rgba(232, 185, 35, 0.2);
  color: var(--gold-500);
}

/* Индикатор качества связи (три полоски сигнала). */
.lesson-video-quality {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 12px;
  margin-left: auto;
}

.lesson-video-quality i {
  width: 3px;
  border-radius: 1px;
  background: rgba(255, 255, 255, 0.28);
}

.lesson-video-quality i:nth-child(1) { height: 45%; }
.lesson-video-quality i:nth-child(2) { height: 72%; }
.lesson-video-quality i:nth-child(3) { height: 100%; }

.lesson-video-tile.is-quality-excellent .lesson-video-quality i {
  background: var(--live-500);
}

.lesson-video-tile.is-quality-good .lesson-video-quality i:nth-child(1),
.lesson-video-tile.is-quality-good .lesson-video-quality i:nth-child(2) {
  background: var(--gold-500);
}

.lesson-video-tile.is-quality-poor .lesson-video-quality i:nth-child(1),
.lesson-video-tile.is-quality-lost .lesson-video-quality i:nth-child(1) {
  background: #e0736b;
}

.lesson-video-notice {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  margin: 10px 12px 0;
  padding: 9px 10px;
  border: 1px solid rgba(232, 185, 35, 0.28);
  border-radius: 10px;
  background: rgba(232, 185, 35, 0.1);
  color: rgba(255, 255, 255, 0.82);
  font-size: 11px;
  line-height: 1.35;
}

.lesson-video-notice[hidden] {
  display: none;
}

.lesson-video-notice > svg {
  width: 16px;
  height: 16px;
  color: var(--gold-500);
}

/* Крестик закрытия предупреждения. */
.lesson-video-notice-close {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: background 130ms var(--ease), color 130ms var(--ease);
}

.lesson-video-notice-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--paper-0);
}

.lesson-video-notice-close svg {
  width: 14px;
  height: 14px;
}

.lesson-video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(190px, 100%), 440px));
  justify-content: center;
  align-content: start;
  gap: 8px;
  min-height: 0;
  padding: 10px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.lesson-video-empty {
  grid-column: 1 / -1;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 6px;
  min-height: 220px;
  padding: 28px;
  color: rgba(255, 255, 255, 0.55);
  text-align: center;
}

.lesson-video-empty[hidden] {
  display: none;
}

.lesson-video-empty svg {
  width: 30px;
  height: 30px;
  margin-bottom: 3px;
}

.lesson-video-empty strong {
  color: rgba(255, 255, 255, 0.82);
  font-size: 13px;
}

.lesson-video-empty span {
  font-size: 10px;
}

.lesson-video-tile {
  position: relative;
  min-width: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 13px;
  background: #24241f;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
  transition: border-color 140ms var(--ease), box-shadow 140ms var(--ease);
  cursor: zoom-in;
}

/* Один участник остаётся аккуратной карточкой, а не растягивается на всю сцену. */
.lesson-video-grid > .lesson-video-tile:only-of-type {
  width: min(100%, 520px);
  justify-self: center;
}

.lesson-video-grid.has-focus {
  grid-template-columns: minmax(0, 1fr);
  align-content: stretch;
}

.lesson-video-grid.has-focus .lesson-video-tile:not(.is-focused) {
  display: none;
}

.lesson-video-grid.has-focus .lesson-video-tile.is-focused {
  align-self: center;
  width: 100%;
  max-height: 100%;
  cursor: zoom-out;
}

.lesson-video-tile.is-speaking {
  border-color: var(--live-500);
  box-shadow: 0 0 0 2px rgba(90, 143, 78, 0.28);
}

.lesson-video-media,
.lesson-video-media video,
.lesson-video-fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.lesson-video-media video {
  display: block;
  object-fit: cover;
  background: #11110f;
}

.lesson-video-tile.is-local .lesson-video-media video {
  transform: scaleX(-1);
}

.lesson-video-tile.is-local.is-screen-source .lesson-video-media video {
  transform: none;
}

.lesson-video-fallback {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 9px;
  padding: 18px;
  background: radial-gradient(circle at 50% 35%, #35352e, #20201c 72%);
  color: rgba(255, 255, 255, 0.68);
  text-align: center;
  transition: opacity 140ms var(--ease);
}

.lesson-video-tile.has-video .lesson-video-fallback {
  opacity: 0;
  pointer-events: none;
}

.lesson-video-fallback .ava {
  width: 54px;
  height: 54px;
  border: 2px solid rgba(255, 255, 255, 0.12);
  background: var(--paper-50);
  color: var(--ink-900);
  font-size: 14px;
}

.lesson-video-fallback small {
  font-size: 9px;
}

.lesson-video-tile-foot {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  padding: 22px 9px 8px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.72));
  color: var(--paper-0);
}

.lesson-video-tile-foot strong {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  font-size: 10px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-video-tile-foot small {
  color: rgba(255, 255, 255, 0.62);
  font-size: 8px;
}

.lesson-video-mic-state {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.42);
  color: rgba(255, 255, 255, 0.82);
}

.lesson-video-mic-state svg {
  width: 12px;
  height: 12px;
}

.lesson-video-tile.is-mic-on .lesson-video-mic-off,
.lesson-video-tile.is-mic-off .lesson-video-mic-on {
  display: none;
}

.lesson-video-controls {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 38px;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: #1e1e1a;
  color: rgba(255, 255, 255, 0.72);
  font-size: 10px;
}

.lesson-video-camera,
.lesson-video-switch-camera {
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.07);
  color: var(--paper-0);
  cursor: pointer;
}

.lesson-video-camera {
  width: 42px;
  height: 42px;
  border-radius: 50%;
}

.lesson-video-switch-camera {
  width: 38px;
  height: 38px;
  border-radius: 11px;
}

.lesson-video-switch-camera[hidden] {
  display: none;
}

.lesson-video-camera.is-on {
  border-color: var(--live-500);
  background: var(--live-500);
}

.lesson-video-camera.is-off {
  color: #e1a452;
}

.lesson-video-camera:disabled,
.lesson-video-switch-camera:disabled {
  cursor: default;
  opacity: 0.58;
}

.lesson-video-camera svg,
.lesson-video-switch-camera svg {
  width: 17px;
  height: 17px;
}

.lesson-video-camera.is-on .lesson-video-camera-off,
.lesson-video-camera.is-off .lesson-video-camera-on,
.lesson-video-camera-loading {
  display: none;
}

.lesson-video-camera[data-camera-state="reconnecting"] .lesson-video-camera-on,
.lesson-video-camera[data-camera-state="reconnecting"] .lesson-video-camera-off {
  display: none;
}

.lesson-video-camera[data-camera-state="reconnecting"] .lesson-video-camera-loading {
  display: block;
  animation: lesson-comms-spin 900ms linear infinite;
}

.lesson-comms-settings {
  display: grid;
  align-content: start;
  gap: 0;
  padding: 4px 14px 10px;
  overflow-y: auto;
  background: var(--paper-0);
}

.lesson-comms-switch {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 10px;
  min-height: 62px;
  padding: 9px 2px;
  border: 0;
  border-bottom: 1px solid var(--hairline);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  transition: background 130ms var(--ease);
}

.lesson-comms-switch:hover {
  background: var(--paper-50);
}

.lesson-comms-switch:last-child {
  border-bottom: 0;
}

.lesson-comms-setting-icon {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--paper-100);
  color: var(--text-2);
}

.lesson-comms-setting-icon svg {
  width: 15px;
  height: 15px;
}

.lesson-comms-setting-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.lesson-comms-switch b {
  color: var(--text-1);
  font-size: 11.5px;
  line-height: 1.25;
}

.lesson-comms-switch small {
  color: var(--text-3);
  font-size: 9px;
  line-height: 1.3;
}

.lesson-comms-switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.lesson-comms-toggle {
  position: relative;
  width: 34px;
  height: 20px;
  border-radius: 10px;
  background: var(--paper-200);
  transition: background 150ms var(--ease);
}

.lesson-comms-toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper-0);
  box-shadow: 0 1px 3px rgba(25, 23, 18, 0.2);
  transition: transform 150ms var(--ease);
}

.lesson-comms-switch input:checked + .lesson-comms-toggle {
  background: var(--live-500);
}

.lesson-comms-switch input:checked + .lesson-comms-toggle::after {
  transform: translateX(14px);
}

@media (max-width: 900px) {
  .room-with-comms {
    --comms-edge: 7px;
    --comms-rail-width: 60px;
    --comms-panel-width: min(348px, calc(100vw - 72px));
    padding-right: 72px;
  }

  .room-with-comms .room-topbar {
    margin-right: -72px;
    padding-right: 14px;
  }

  .lesson-comms-rail {
    top: 58px;
    bottom: 7px;
    padding-inline: 5px;
    border-radius: 17px;
  }

  .lesson-comms-tab {
    width: 48px;
  }

  .lesson-comms-person,
  .lesson-comms-rail .lesson-comms-more {
    width: 40px;
    height: 40px;
    flex-basis: 40px;
  }

  .lesson-comms-person .ava {
    width: 34px;
    height: 34px;
  }

  .lesson-comms-own-mic {
    width: 46px;
    height: 46px;
    flex-basis: 46px;
  }

  .lesson-comms-panel {
    max-height: calc(100dvh - var(--comms-panel-top, 58px) - 7px);
  }
}

@media (max-width: 560px) {
  .room-with-comms {
    --comms-panel-width: calc(100vw - 74px);
  }

  .lesson-voice-list {
    padding-inline: 12px;
  }

  .lesson-voice-person {
    grid-template-columns: 32px minmax(0, 1fr) auto;
    gap: 8px;
  }

  .lesson-voice-person > .ava {
    width: 32px;
    height: 32px;
  }
}