/* ═══════════════════════════════════════════════
   НАСТАВНИК PWA — style.css
   Базовые стили, переменные, типографика
═══════════════════════════════════════════════ */

/* ── CSS ПЕРЕМЕННЫЕ ──────────────────────────── */
:root {
  /* Зелёная палитра */
  --green-900: #04342C;
  --green-800: #085041;
  --green-700: #0F6E56;
  --green-500: #1D9E75;
  --green-300: #5DCAA5;
  --green-100: #9FE1CB;
  --green-50:  #E1F5EE;

  /* Акценты */
  --amber:        #EF9F27;
  --amber-light:  #FAEEDA;
  --amber-dark:   #633806;
  --purple:       #534AB7;
  --purple-light: #EEEDFE;
  --red:          #E24B4A;
  --red-light:    #FDEAEA;
  --blue:         #185FA5;
  --blue-light:   #E8F1FB;

  /* Нейтральные */
  --white:      #FFFFFF;
  --bg:         #F6FDF9;
  --text-dark:  #0D2B22;
  --text-mid:   #2C6B55;
  --text-muted: #4A8A72;
  --border:     #9FE1CB;

  /* Типографика */
  --font-main:  'Nunito', sans-serif;
  --font-head:  'Unbounded', sans-serif;

  /* Скругления */
  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full: 999px;

  /* Тени */
  --shadow-sm:  0 2px 8px rgba(8,80,65,.08);
  --shadow-md:  0 6px 24px rgba(8,80,65,.12);
  --shadow-lg:  0 16px 48px rgba(8,80,65,.16);

  /* Transitions */
  --ease:       .2s ease;

  /* Высота навбаров */
  --nav-top:    56px;
  --nav-bottom: 64px;

  /* Safe areas (iOS) */
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top:    env(safe-area-inset-top, 0px);
}

/* ── RESET ───────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text-dark);
  line-height: 1.5;
  min-height: 100%;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; }
ul, ol { list-style: none; }

/* ── ТИПОГРАФИКА ─────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  line-height: 1.2;
  color: var(--text-dark);
}

h1 { font-size: clamp(22px, 5vw, 32px); font-weight: 900; }
h2 { font-size: clamp(18px, 4vw, 26px); font-weight: 900; }
h3 { font-size: clamp(15px, 3vw, 20px); font-weight: 700; }
h4 { font-size: 15px; font-weight: 700; }

p { font-size: 15px; line-height: 1.6; }

/* ── СКРОЛЛБАР ───────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--green-100); border-radius: 4px; }

/* ── КНОПКИ ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-main);
  font-weight: 800;
  border-radius: var(--radius-full);
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--green-800);
  color: var(--white);
  padding: 14px 28px;
  font-size: 15px;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { background: var(--green-700); box-shadow: var(--shadow-lg); }

.btn-secondary {
  background: var(--green-50);
  color: var(--green-800);
  padding: 14px 28px;
  font-size: 15px;
  border: 2px solid var(--green-100);
}
.btn-secondary:hover { background: var(--green-100); }

.btn-amber {
  background: var(--amber);
  color: var(--amber-dark);
  padding: 14px 28px;
  font-size: 15px;
  box-shadow: 0 4px 16px rgba(239,159,39,.3);
}
.btn-amber:hover { filter: brightness(1.05); }

.btn-danger {
  background: var(--red-light);
  color: var(--red);
  padding: 12px 24px;
  font-size: 14px;
}
.btn-danger:hover { background: var(--red); color: var(--white); }

.btn-ghost {
  background: transparent;
  color: var(--text-mid);
  padding: 12px 20px;
  font-size: 14px;
}
.btn-ghost:hover { background: var(--green-50); }

.btn-sm { padding: 9px 18px; font-size: 13px; }
.btn-lg { padding: 18px 36px; font-size: 17px; }
.btn-full { width: 100%; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── ФОРМЫ ───────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-mid);
}

.form-input {
  width: 100%;
  padding: 13px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  background: var(--white);
  transition: border-color var(--ease), box-shadow var(--ease);
  outline: none;
}

.form-input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(29,158,117,.12);
}

.form-input::placeholder { color: var(--text-muted); font-weight: 400; }

.form-input.error { border-color: var(--red); }
.form-error { font-size: 12px; color: var(--red); font-weight: 600; }
.form-hint { font-size: 12px; color: var(--text-muted); }

textarea.form-input { resize: vertical; min-height: 100px; }

select.form-input { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234A8A72' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; padding-right: 40px; }

/* ── КАРТОЧКИ ────────────────────────────────── */
.card {
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1.5px solid var(--green-50);
  box-shadow: var(--shadow-sm);
  padding: 20px;
}

.card-hover {
  transition: transform var(--ease), box-shadow var(--ease);
}
.card-hover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ── БЕЙДЖИ / СТАТУСЫ ────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
}

.badge-green   { background: var(--green-50);   color: var(--green-700); }
.badge-amber   { background: var(--amber-light); color: var(--amber-dark); }
.badge-red     { background: var(--red-light);   color: var(--red); }
.badge-purple  { background: var(--purple-light);color: var(--purple); }
.badge-blue    { background: var(--blue-light);  color: var(--blue); }

.badge-dot::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  display: inline-block;
}

/* ── TOAST УВЕДОМЛЕНИЯ ───────────────────────── */
#toast-container {
  position: fixed;
  bottom: calc(var(--nav-bottom) + 16px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  width: calc(100% - 32px);
  max-width: 380px;
  pointer-events: none;
}

.toast {
  background: var(--green-900);
  color: var(--white);
  padding: 12px 18px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  animation: toastIn .3s cubic-bezier(.34,1.56,.64,1) forwards;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.toast.success { background: var(--green-700); }
.toast.error   { background: var(--red); }
.toast.warning { background: var(--amber-dark); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px) scale(.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
  to   { opacity: 0; transform: translateY(10px) scale(.95); }
}

/* ── МОДАЛЬНЫЕ ОКНА ──────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4,52,44,.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: fadeIn .2s ease;
}

.modal-overlay.center { align-items: center; }

.modal {
  background: var(--white);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: 24px 20px calc(20px + var(--safe-bottom));
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp .3s cubic-bezier(.34,1.56,.64,1);
}

.modal.center-modal {
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  margin: 16px;
  max-height: 85vh;
}

.modal-handle {
  width: 40px; height: 4px;
  background: var(--green-100);
  border-radius: 4px;
  margin: 0 auto 20px;
}

.modal-title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  color: var(--text-dark);
  margin-bottom: 16px;
  text-align: center;
}

@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(40px); } to { transform: translateY(0); } }

/* ── ЗАГРУЗКА ────────────────────────────────── */
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--green-100);
  border-top-color: var(--green-500);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

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

.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--green-800);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  gap: 20px;
}

.loading-screen .spinner {
  border-color: rgba(255,255,255,.2);
  border-top-color: var(--white);
  width: 40px; height: 40px;
}

/* ── УТИЛИТЫ ─────────────────────────────────── */
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.flex   { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }
.divider {
  height: 1px;
  background: var(--green-50);
  margin: 16px 0;
}

/* ─────────────────────────────────────────────
   MOBILE LESSON ADAPTATION
   Урок на телефоне: видео, доска, чат, панели
───────────────────────────────────────────── */

@media (max-width: 768px) {
  .lesson-screen {
    height: 100dvh !important;
    max-height: 100dvh !important;
    overflow: hidden !important;
  }

  .lesson-top-bar {
    min-height: 48px !important;
    padding: 6px 8px !important;
    gap: 6px !important;
    flex-shrink: 0 !important;
  }

  .lesson-top-bar > div {
    min-width: 0 !important;
  }

  .lesson-top-bar button,
  .lesson-control-btn {
    min-width: 38px !important;
    min-height: 38px !important;
    font-size: 13px !important;
  }

  .lesson-timer {
    font-size: 13px !important;
    padding: 6px 8px !important;
    white-space: nowrap !important;
  }

  .lesson-screen .btn-sm {
    min-height: 36px !important;
    padding: 7px 10px !important;
    font-size: 12px !important;
  }

  .lesson-screen input,
  .lesson-screen textarea,
  .lesson-screen .form-input {
    font-size: 16px !important;
  }

  /* Основной контейнер урока переводим в колонку */
  .lesson-screen > div[style*="flex:1"][style*="display:flex"] {
    flex-direction: column !important;
    min-height: 0 !important;
    overflow: hidden !important;
  }

  /* Центральная зона урока */
  .lesson-screen div[style*="Основная зона"],
  .lesson-screen div[style*="flex:1;display:flex;flex-direction:column"] {
    min-height: 0 !important;
  }

  /* Боковая панель наставника становится нижней */
  .lesson-screen div[style*="width:240px"] {
    width: 100% !important;
    max-height: 34dvh !important;
    overflow-y: auto !important;
    border-left: none !important;
    border-top: 1px solid rgba(255,255,255,.1) !important;
    flex-shrink: 0 !important;
  }

  /* Видео и доска */
  #panel-video {
    min-height: 140px !important;
    height: 30dvh !important;
    flex-shrink: 0 !important;
  }

  #panel-board {
    min-height: 260px !important;
    flex: 1 1 auto !important;
    overflow: hidden !important;
  }

  #jitsi-container,
  #board-container {
    width: 100% !important;
    height: 100% !important;
  }

  /* Панель инструментов доски */
  .board-tool {
    min-width: 34px !important;
    min-height: 34px !important;
    font-size: 14px !important;
  }

  #board-canvas {
    touch-action: none !important;
  }

  /* Чат родителя/наставника */
  #chat-messages {
    max-height: 120px !important;
  }

  #chat-input {
    min-height: 40px !important;
  }

  /* Быстрые кнопки родителя */
  .lesson-screen button {
    white-space: normal !important;
  }
}

@media (max-width: 430px) {
  .lesson-top-bar {
    font-size: 12px !important;
  }

  #panel-video {
    min-height: 120px !important;
    height: 26dvh !important;
  }

  #panel-board {
    min-height: 240px !important;
  }

  .lesson-screen div[style*="width:240px"] {
    max-height: 38dvh !important;
  }

  .lesson-screen .btn {
    font-size: 12px !important;
  }
}


/* ─────────────────────────────────────────────
   MENTOR MOBILE LESSON FIX
   Не трогаем родителя. Чиним только экран наставника.
───────────────────────────────────────────── */

@media (max-width: 768px) {
  .mentor-lesson-screen {
    height: 100dvh !important;
    max-height: 100dvh !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen > div[style*="flex:1"] {
    display: flex !important;
    flex-direction: column !important;
    min-height: 0 !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen .mentor-video-panel {
    height: 24dvh !important;
    min-height: 135px !important;
    max-height: 190px !important;
    flex: 0 0 auto !important;
    display: flex !important;
    position: relative !important;
    z-index: 1 !important;
  }

  .mentor-lesson-screen .mentor-board-panel {
    height: 38dvh !important;
    min-height: 260px !important;
    flex: 1 1 auto !important;
    display: flex !important;
    overflow: hidden !important;
    position: relative !important;
    z-index: 2 !important;
    background: #f8fffe !important;
  }

  .mentor-lesson-screen .mentor-board-container {
    width: 100% !important;
    height: 100% !important;
    min-height: 260px !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen .mentor-side-panel {
    width: 100% !important;
    max-height: 32dvh !important;
    min-height: 150px !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    border-left: none !important;
    border-top: 1px solid rgba(255,255,255,.12) !important;
    flex: 0 0 auto !important;
    z-index: 3 !important;
  }

  .mentor-lesson-screen .mentor-side-panel > div {
    padding: 8px 10px !important;
  }

  .mentor-lesson-screen #chat-messages {
    max-height: 105px !important;
    overflow-y: auto !important;
  }

  .mentor-lesson-screen #chat-input {
    min-height: 40px !important;
    font-size: 16px !important;
  }

  .mentor-lesson-screen .board-tool {
    min-width: 34px !important;
    min-height: 34px !important;
  }

  .mentor-lesson-screen button[onclick*="__boardClear"] {
    min-width: 118px !important;
    min-height: 34px !important;
    font-size: 11px !important;
  }

  .mentor-lesson-screen button[onclick*="__boardUndo"] {
    min-width: 42px !important;
    min-height: 34px !important;
    font-size: 15px !important;
  }

  .mentor-lesson-screen #board-canvas {
    width: 100% !important;
    height: 100% !important;
    touch-action: none !important;
  }
}

@media (max-width: 430px) {
  .mentor-lesson-screen .mentor-video-panel {
    height: 21dvh !important;
    min-height: 120px !important;
  }

  .mentor-lesson-screen .mentor-board-panel {
    height: 42dvh !important;
    min-height: 250px !important;
  }

  .mentor-lesson-screen .mentor-side-panel {
    max-height: 33dvh !important;
  }
}


/* Mentor mobile: нижняя панель строго под доской */
@media (max-width: 768px) {
  .mentor-lesson-screen .mentor-side-panel {
    position: relative !important;
    z-index: 1 !important;
    order: 3 !important;
    width: 100% !important;
    max-height: 26dvh !important;
    min-height: 135px !important;
    overflow-y: auto !important;
    background: rgba(0,0,0,.72) !important;
  }

  .mentor-lesson-screen .mentor-video-panel {
    order: 1 !important;
  }

  .mentor-lesson-screen .mentor-board-panel {
    order: 2 !important;
    min-height: 300px !important;
  }
}


/* Board toolbar mobile scroll */
@media (max-width: 768px) {
  .mentor-lesson-screen .board-tool,
  .mentor-lesson-screen button[onclick*="__boardColor"],
  .mentor-lesson-screen button[onclick*="__boardWidth"],
  .mentor-lesson-screen button[onclick*="__boardUndo"],
  .mentor-lesson-screen button[onclick*="__boardClear"] {
    flex: 0 0 auto !important;
  }

  .mentor-lesson-screen div:has(> .board-tool) {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    white-space: nowrap !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: thin !important;
  }

  .mentor-lesson-screen div:has(> .board-tool) > div[style*="flex:1"] {
    flex: 0 0 8px !important;
    min-width: 8px !important;
  }

  .mentor-lesson-screen button[onclick*="__boardClear"] {
    min-width: 132px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
  }

  .mentor-lesson-screen button[onclick*="__boardUndo"] {
    min-width: 42px !important;
  }
}

/* Mentor mobile: больше места доске */
@media (max-width: 768px) {
  .mentor-lesson-screen .mentor-video-panel {
    height: 15dvh !important;
    min-height: 90px !important;
    max-height: 125px !important;
  }

  .mentor-lesson-screen .mentor-board-panel {
    height: 55dvh !important;
    min-height: 340px !important;
  }

  .mentor-lesson-screen .mentor-board-container {
    min-height: 340px !important;
  }

  .mentor-lesson-screen .mentor-side-panel {
    max-height: 22dvh !important;
    min-height: 110px !important;
  }
}


@media (max-width: 768px) {
  .board-toolbar {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    white-space: nowrap !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: thin !important;
    max-width: 100% !important;
  }

  .board-toolbar > * {
    flex-shrink: 0 !important;
  }
}


/* Mentor mobile: убираем кнопки, которые закрывают видео */
@media (max-width: 768px) {
  .mentor-lesson-screen .mentor-bottom-controls {
    display: none !important;
  }

  .mentor-lesson-screen #tab-video {
    display: none !important;
  }

  .mentor-lesson-screen #tab-board {
    width: 100% !important;
    justify-content: center !important;
    pointer-events: none !important;
    opacity: .85 !important;
  }

  .mentor-lesson-screen .mentor-video-panel {
    overflow: hidden !important;
    z-index: 1 !important;
  }

  .mentor-lesson-screen .mentor-video-panel iframe,
  .mentor-lesson-screen #jitsi-container iframe {
    max-height: 100% !important;
  }

  .mentor-lesson-screen .mentor-board-panel {
    z-index: 2 !important;
  }

  .mentor-lesson-screen .mentor-side-panel {
    z-index: 1 !important;
  }
}


@media (max-width: 768px) {
  .mentor-lesson-screen #mentor-expand-board-btn {
    display: block !important;
    width: calc(100% - 16px) !important;
    margin: 4px 8px !important;
    min-height: 34px !important;
    font-size: 12px !important;
    font-weight: 800 !important;
    flex-shrink: 0 !important;
  }
}

@media (min-width: 769px) {
  #mentor-expand-board-btn {
    display: none !important;
  }
}


/* Mentor mobile hard hide old tabs */
@media (max-width: 768px) {
  .mentor-lesson-screen #tab-video,
  .mentor-lesson-screen #tab-board {
    display: none !important;
    visibility: hidden !important;
    width: 0 !important;
    height: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen #mentor-expand-board-btn {
    display: block !important;
    position: relative !important;
    z-index: 20 !important;
    pointer-events: auto !important;
  }
}


/* Mentor mobile final: убираем кнопку разворота */
@media (max-width: 768px) {
  .mentor-lesson-screen #mentor-expand-board-btn {
    display: none !important;
  }
}


/* Mentor mobile final normal layout */
@media (max-width: 768px) {
  .mentor-lesson-screen #tab-video,
  .mentor-lesson-screen #tab-board,
  .mentor-lesson-screen #mentor-expand-board-btn,
  .mentor-lesson-screen .mentor-bottom-controls {
    display: none !important;
  }

  .mentor-lesson-screen .mentor-video-panel {
    height: 20dvh !important;
    min-height: 125px !important;
    max-height: 175px !important;
    flex: 0 0 auto !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen .mentor-board-panel {
    height: 58dvh !important;
    min-height: 360px !important;
    flex: 1 1 auto !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen .mentor-board-container {
    min-height: 360px !important;
  }

  .mentor-lesson-screen .mentor-side-panel {
    max-height: 18dvh !important;
    min-height: 90px !important;
    overflow-y: auto !important;
    flex: 0 0 auto !important;
  }

  .mentor-lesson-screen .board-toolbar {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    white-space: nowrap !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .mentor-lesson-screen .board-toolbar > * {
    flex-shrink: 0 !important;
  }
}


/* Mentor mobile: чистое видео без наложений */
@media (max-width: 768px) {
  .mentor-lesson-screen .mentor-video-panel {
    background: #000 !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen #jitsi-container {
    background: #000 !important;
    overflow: hidden !important;
  }

  .mentor-lesson-screen #jitsi-container iframe {
    width: 100% !important;
    height: 100% !important;
    border: 0 !important;
    display: block !important;
  }
}


/* Child lesson mobile layout */
@media (max-width: 768px) {
  .child-lesson-screen {
    height: 100dvh !important;
    max-height: 100dvh !important;
    overflow: hidden !important;
    display: flex !important;
    flex-direction: column !important;
  }

  .child-lesson-screen .child-video-panel {
    height: 24dvh !important;
    min-height: 150px !important;
    max-height: 220px !important;
    flex: 0 0 auto !important;
    overflow: hidden !important;
    background: #000 !important;
  }

  .child-lesson-screen .child-video-panel iframe,
  .child-lesson-screen #jitsi-container iframe {
    width: 100% !important;
    height: 100% !important;
    border: 0 !important;
    display: block !important;
  }

  .child-lesson-screen .child-board-panel {
    flex: 1 1 auto !important;
    min-height: 0 !important;
    overflow: hidden !important;
  }

  .child-lesson-screen .child-bottom-controls {
    display: flex !important;
    flex-wrap: nowrap !important;
    gap: 8px !important;
    padding: 8px !important;
    overflow-x: auto !important;
    flex-shrink: 0 !important;
    background: rgba(0,0,0,.55) !important;
  }

  .child-lesson-screen .child-bottom-controls > * {
    flex-shrink: 0 !important;
  }

  .child-lesson-screen .board-toolbar {
    overflow-x: auto !important;
    white-space: nowrap !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .child-lesson-screen .board-toolbar > * {
    flex-shrink: 0 !important;
  }
}


/* Child final normal layout: видео сверху, доска по центру, кнопки снизу */
@media (max-width: 768px) {
  .child-lesson-screen {
    height: 100dvh !important;
    max-height: 100dvh !important;
    display: flex !important;
    flex-direction: column !important;
    overflow: hidden !important;
  }

  .child-lesson-screen #panel-video,
  .child-lesson-screen .child-video-panel {
    display: flex !important;
    height: 24dvh !important;
    min-height: 150px !important;
    max-height: 220px !important;
    flex: 0 0 auto !important;
    overflow: hidden !important;
    background: #000 !important;
  }

  .child-lesson-screen #panel-board,
  .child-lesson-screen .child-board-panel {
    display: flex !important;
    flex: 1 1 auto !important;
    min-height: 0 !important;
    overflow: hidden !important;
  }

  .child-lesson-screen #board-container {
    width: 100% !important;
    height: 100% !important;
    min-height: 0 !important;
  }

  .child-lesson-screen .child-bottom-controls {
    flex: 0 0 auto !important;
    display: flex !important;
    gap: 8px !important;
    align-items: center !important;
    justify-content: center !important;
    overflow-x: auto !important;
    padding: 8px !important;
  }

  .child-lesson-screen .child-bottom-controls > * {
    flex-shrink: 0 !important;
  }
}


/* Child final layout for all screen sizes:
   видео сверху, доска по центру, кнопки снизу */
.child-lesson-screen {
  height: 100dvh !important;
  max-height: 100dvh !important;
  display: flex !important;
  flex-direction: column !important;
  overflow: hidden !important;
}

.child-lesson-screen .lesson-top-bar {
  flex: 0 0 auto !important;
}

.child-lesson-screen #panel-video,
.child-lesson-screen .child-video-panel {
  display: flex !important;
  flex: 0 0 clamp(150px, 24dvh, 260px) !important;
  height: clamp(150px, 24dvh, 260px) !important;
  min-height: 150px !important;
  max-height: 260px !important;
  overflow: hidden !important;
  background: #000 !important;
}

.child-lesson-screen #jitsi-container,
.child-lesson-screen #jitsi-container iframe {
  width: 100% !important;
  height: 100% !important;
  border: 0 !important;
  display: block !important;
}

.child-lesson-screen #panel-board,
.child-lesson-screen .child-board-panel {
  display: flex !important;
  flex: 1 1 auto !important;
  min-height: 0 !important;
  overflow: hidden !important;
}

.child-lesson-screen #board-container {
  width: 100% !important;
  height: 100% !important;
  min-height: 0 !important;
  overflow: hidden !important;
}

.child-lesson-screen .child-bottom-controls {
  flex: 0 0 auto !important;
  display: flex !important;
  gap: 8px !important;
  align-items: center !important;
  justify-content: center !important;
  overflow-x: auto !important;
  padding: 8px !important;
  background: rgba(0,0,0,.55) !important;
}

.child-lesson-screen .child-bottom-controls > * {
  flex-shrink: 0 !important;
}

/* На широком экране видео не должно становиться огромным */
@media (min-width: 769px) {
  .child-lesson-screen #panel-video,
  .child-lesson-screen .child-video-panel {
    flex-basis: 260px !important;
    height: 260px !important;
    max-height: 260px !important;
  }
}

/* На маленьком телефоне видео компактнее */
@media (max-width: 480px) {
  .child-lesson-screen #panel-video,
  .child-lesson-screen .child-video-panel {
    flex-basis: 170px !important;
    height: 170px !important;
    min-height: 150px !important;
    max-height: 190px !important;
  }
}


/* Characters */
.character-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  animation: character-pop .28s ease-out;
}

.character-img {
  object-fit: contain;
  filter: drop-shadow(0 12px 22px rgba(0,0,0,.18));
}

.character-bubble {
  background: #fff;
  color: var(--text-main);
  border-radius: 18px;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.3;
  box-shadow: 0 8px 22px rgba(0,0,0,.12);
  position: relative;
  max-width: 260px;
  text-align: center;
}

.character-bubble::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -8px;
  transform: translateX(-50%);
  border-width: 8px 8px 0 8px;
  border-style: solid;
  border-color: #fff transparent transparent transparent;
}

@keyframes character-pop {
  from { transform: scale(.92); opacity: .4; }
  to { transform: scale(1); opacity: 1; }
}

/* Ponchik emotion buttons in child lesson */
.ponchik-emotion-row {
  display: flex;
  gap: 6px;
  flex: 1;
  justify-content: center;
  align-items: center;
}

.ponchik-emotion-btn {
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 16px;
  background: rgba(255,255,255,.18);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3px;
  cursor: pointer;
  position: relative;
}

.ponchik-emotion-btn img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.25));
}

.ponchik-emotion-btn:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 54px;
  left: 50%;
  transform: translateX(-50%);
  width: 210px;
  background: #fff;
  color: var(--text-main);
  border-radius: 14px;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.25;
  box-shadow: 0 8px 22px rgba(0,0,0,.2);
  z-index: 999;
}

.ponchik-emotion-btn:hover::before {
  content: '';
  position: absolute;
  bottom: 47px;
  left: 50%;
  transform: translateX(-50%);
  border-width: 8px 8px 0 8px;
  border-style: solid;
  border-color: #fff transparent transparent transparent;
  z-index: 999;
}

.ponchik-emotion-row {
  display: flex;
  gap: 6px;
  flex: 1;
  justify-content: center;
  align-items: center;
  min-width: 0;
}

.ponchik-emotion-btn {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 15px;
  background: rgba(255,255,255,.18);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3px;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}

.ponchik-emotion-btn img {
  width: 39px;
  height: 39px;
  object-fit: contain;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.25));
}

.child-media-ponchik {
  position: relative;
  font-size: 18px;
}

.child-media-ponchik span {
  position: absolute;
  right: -4px;
  bottom: -4px;
  font-size: 12px;
}

/* Child mood panel */
.child-mood-panel {
  display: flex;
  gap: 6px;
  flex: 1;
  justify-content: center;
  align-items: stretch;
  min-width: 0;
  overflow-x: auto;
  padding: 2px 0;
}

.child-mood-btn {
  min-width: 58px;
  height: 56px;
  border: none;
  border-radius: 16px;
  background: rgba(255,255,255,.16);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 3px 5px;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: transform .12s ease, background .12s ease;
}

.child-mood-btn img {
  width: 31px;
  height: 31px;
  object-fit: contain;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.25));
}

.child-mood-btn span {
  font-size: 9px;
  font-weight: 900;
  color: rgba(255,255,255,.86);
  line-height: 1;
  white-space: nowrap;
}

.child-mood-btn.active {
  background: rgba(255,217,85,.32);
  transform: translateY(-3px) scale(1.04);
}

.child-mood-btn:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 63px;
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 180px;
  background: #fff;
  color: var(--text-main);
  border-radius: 14px;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.2;
  box-shadow: 0 8px 22px rgba(0,0,0,.2);
  z-index: 999;
}

.child-mood-btn:hover::before {
  content: '';
  position: absolute;
  bottom: 56px;
  left: 50%;
  transform: translateX(-50%);
  border-width: 8px 8px 0 8px;
  border-style: solid;
  border-color: #fff transparent transparent transparent;
  z-index: 999;
}

.character-popup .character-img {
  width: 110px !important;
}

.character-popup .character-bubble {
  font-size: 13px;
  padding: 8px 12px;
  max-width: 180px;
}

/* Child lesson mobile adaptation */
@media (max-width: 640px) {
  .lesson-screen {
    height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
  }

  .lesson-top-bar {
    min-height: 48px;
    padding: 6px 8px;
    gap: 6px;
  }

  .lesson-timer {
    font-size: 14px !important;
    min-width: 50px;
  }

  #subject-progress-block {
    font-size: 11px !important;
    line-height: 1.15;
    max-width: 42vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #panel-video {
    height: 25% !important;
    min-height: 120px !important;
    max-height: 170px !important;
  }

  #panel-board {
    flex: 1;
    min-height: 0;
  }

  #board-container {
    min-height: 0;
  }

  .child-mood-panel {
    gap: 4px;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 3px 2px;
  }

  .child-mood-btn {
    min-width: 52px;
    height: 52px;
    border-radius: 14px;
    padding: 3px;
  }

  .child-mood-btn img {
    width: 28px;
    height: 28px;
  }

  .child-mood-btn span {
    font-size: 8px;
  }

  .child-mood-btn:hover::after,
  .child-mood-btn:hover::before {
    display: none;
  }

  #child-character-reaction {
    bottom: 92px !important;
    max-width: 80vw;
  }

  .character-popup .character-img {
    width: 88px !important;
  }

  .character-popup .character-bubble {
    font-size: 12px;
    max-width: 160px;
    padding: 7px 10px;
  }

  .lesson-control-btn {
    width: 36px;
    height: 36px;
    min-width: 36px;
  }
}

@media (max-width: 390px) {
  .child-mood-btn {
    min-width: 48px;
    height: 50px;
  }

  .child-mood-btn img {
    width: 26px;
    height: 26px;
  }

  .child-mood-btn span {
    font-size: 7.5px;
  }

  #subject-progress-block {
    max-width: 36vw;
  }
}

/* Media Engine */
.media-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
}

.media-modal.show {
  display: block;
}

.media-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.68);
}

.media-modal-card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(92vw, 720px);
  max-height: 88vh;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 24px;
  padding: 16px;
  box-shadow: 0 24px 80px rgba(0,0,0,.35);
}

.media-modal-close {
  position: absolute;
  right: 12px;
  top: 10px;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 999px;
  background: rgba(0,0,0,.08);
  font-size: 24px;
  font-weight: 900;
  cursor: pointer;
}

.media-modal-title {
  font-size: 18px;
  font-weight: 900;
  color: var(--text-main);
  padding: 4px 44px 12px 4px;
}

.media-modal-body {
  display: flex;
  justify-content: center;
  align-items: center;
}

.media-player {
  width: 100%;
  max-height: 68vh;
  border-radius: 18px;
  background: #000;
}

.media-audio-wrap {
  width: 100%;
  padding: 24px 12px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  background: var(--green-50);
  border-radius: 18px;
}

.media-audio-icon {
  font-size: 54px;
}

.media-audio {
  width: 100%;
}

/* Media Engine */
.media-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
}

.media-modal.show {
  display: block;
}

.media-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.68);
}

.media-modal-card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(92vw, 720px);
  max-height: 88vh;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 24px;
  padding: 16px;
  box-shadow: 0 24px 80px rgba(0,0,0,.35);
}

.media-modal-close {
  position: absolute;
  right: 12px;
  top: 10px;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 999px;
  background: rgba(0,0,0,.08);
  font-size: 24px;
  font-weight: 900;
  cursor: pointer;
}

.media-modal-title {
  font-size: 18px;
  font-weight: 900;
  color: var(--text-main);
  padding: 4px 44px 12px 4px;
}

.media-modal-body {
  display: flex;
  justify-content: center;
  align-items: center;
}

.media-player {
  width: 100%;
  max-height: 68vh;
  border-radius: 18px;
  background: #000;
}

.media-audio-wrap {
  width: 100%;
  padding: 24px 12px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  background: var(--green-50);
  border-radius: 18px;
}

.media-audio-icon {
  font-size: 54px;
}

.media-audio {
  width: 100%;
}

/* Magic board toolbar v2 */
.board-toolbar-v2 {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  background: var(--green-900);
  overflow-x: auto;
  flex-shrink: 0;
  -webkit-overflow-scrolling: touch;
}

.board-toolbar-v2 .board-tool,
.board-action-btn,
.board-clear-btn {
  min-width: 34px;
  height: 34px;
  border: none;
  border-radius: 10px;
  background: rgba(255,255,255,.12);
  color: #fff;
  font-size: 16px;
  font-weight: 900;
  cursor: pointer;
  flex-shrink: 0;
}

.board-toolbar-v2 .board-tool.active {
  background: var(--amber);
  color: var(--amber-dark);
}

.board-divider {
  width: 1px;
  height: 24px;
  background: rgba(255,255,255,.16);
  flex-shrink: 0;
  margin: 0 2px;
}

.board-palette {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.board-color-btn {
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.42);
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: 0 2px 7px rgba(0,0,0,.18);
}

.board-color-btn:hover {
  transform: translateY(-1px) scale(1.06);
}

.board-widths {
  display: flex;
  gap: 5px;
  align-items: center;
  flex-shrink: 0;
}

.board-width-btn {
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 10px;
  background: rgba(255,255,255,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
}

.board-width-btn span {
  display: block;
  border-radius: 999px;
  background: #fff;
}

.board-spacer {
  flex: 1;
  min-width: 8px;
}

.board-clear-btn {
  padding: 0 10px;
  min-width: 92px;
  background: rgba(226,75,74,.38);
  font-size: 12px;
}

@media (max-width: 640px) {
  .board-toolbar-v2 {
    padding: 6px 8px;
    gap: 5px;
  }

  .board-toolbar-v2 .board-tool,
  .board-action-btn,
  .board-clear-btn,
  .board-width-btn {
    min-width: 32px;
    width: 32px;
    height: 32px;
    border-radius: 9px;
  }

  .board-color-btn {
    width: 22px !important;
    height: 22px !important;
  }

  .board-clear-btn {
    width: auto;
    min-width: 78px;
    font-size: 11px;
  }
}

/* Board active state */
.board-toolbar-v2 .board-tool.active {
  background: var(--amber);
  color: var(--amber-dark);
  box-shadow: 0 0 0 2px rgba(255,255,255,.45), 0 6px 16px rgba(0,0,0,.22);
  transform: translateY(-1px);
}

.board-color-btn.active {
  box-shadow: 0 0 0 3px var(--amber), 0 0 0 5px rgba(255,255,255,.75), 0 6px 16px rgba(0,0,0,.28);
  transform: translateY(-2px) scale(1.12);
}

.board-width-btn.active {
  background: var(--amber);
  box-shadow: 0 0 0 2px rgba(255,255,255,.45), 0 6px 16px rgba(0,0,0,.22);
  transform: translateY(-1px);
}

.board-width-btn.active span {
  background: var(--amber-dark);
}

/* Mobile board panning */
#board-canvas {
  will-change: transform;
}

@media (max-width: 640px) {
  .board-center-btn {
    display: inline-flex;
  }
}

/* Board pan sliders */
.board-sliders {
  display: none;
  gap: 6px;
  padding: 5px 8px;
  background: rgba(8,80,65,.95);
  border-top: 1px solid rgba(255,255,255,.1);
  flex-shrink: 0;
}

.board-slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

.board-slider-row span {
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  width: 18px;
  text-align: center;
}

.board-slider-row input[type="range"] {
  width: 100%;
  accent-color: var(--amber);
}

@media (max-width: 760px) {
  .board-sliders {
    display: flex;
  }
}

/* BoardEngine v2 test */
.be-test {
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #eef8f5;
}

.be-test-toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px;
  background: var(--green-900);
  color: #fff;
}

.be-test-toolbar button {
  border: none;
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 900;
  background: var(--amber);
  color: var(--amber-dark);
}

.be-viewport {
  flex: 1;
  overflow: auto;
  position: relative;
  background: #dbeee8;
}

#be-canvas {
  display: block;
  background: #f8fffe;
  touch-action: none;
}

/* BoardEngine test modes */
.be-test-toolbar .be-mode {
  min-width: 112px;
}

.be-test-toolbar .be-mode.active {
  background: #fff;
  color: var(--green-900);
  box-shadow: 0 0 0 2px var(--amber);
}

@media (max-width: 640px) {
  .be-test-toolbar {
    overflow-x: auto;
  }

  .be-test-toolbar .be-mode {
    min-width: 104px;
  }
}

/* BoardEngine zoom switch */
.be-zoom-group {
  display:flex;
  gap:0;
  border-radius:10px;
  overflow:hidden;
}

.be-zoom {
  min-width:52px;
  height:34px;
  border:none;
  background:rgba(255,255,255,.12);
  color:#fff;
  font-weight:900;
  cursor:pointer;
}

.be-zoom:first-child {
  border-radius:10px 0 0 10px;
}

.be-zoom:last-child {
  border-radius:0 10px 10px 0;
}

.be-zoom.active {
  background:var(--amber);
  color:var(--amber-dark);
  box-shadow:
    inset 0 0 0 2px rgba(255,255,255,.5),
    0 4px 12px rgba(0,0,0,.25);
}

.be-test canvas {
  cursor: crosshair;
}

.be-test.pan-mode canvas {
  cursor: grab;
}

/* ===== BoardEngine Zoom Switch FIX ===== */

.be-test-toolbar{
    display:flex;
    align-items:center;
    gap:10px;
    flex-wrap:wrap;
}

.be-zoom-group{
    display:inline-flex;
    align-items:center;
    border-radius:12px;
    overflow:hidden;
    border:1px solid rgba(255,255,255,.15);
    flex-shrink:0;
}

.be-zoom{
    width:62px;
    height:38px;
    display:flex;
    align-items:center;
    justify-content:center;
    border:none;
    margin:0;
    padding:0;
    font-size:14px;
    font-weight:700;
    line-height:1;
    background:rgba(255,255,255,.12);
    color:#fff;
}

.be-zoom+.be-zoom{
    border-left:1px solid rgba(255,255,255,.15);
}

.be-zoom.active{
    background:var(--amber);
    color:var(--amber-dark);
}

@media (max-width:700px){

    .be-test-toolbar{
        gap:8px;
    }

    .be-zoom{
        width:54px;
        height:34px;
        font-size:13px;
    }

}


/* Board v2 */
.board-v2 {
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #eef8f5;
}

.board-v2-viewport {
  flex: 1;
  overflow: auto;
  position: relative;
  background: #dbeee8;
}

#board-v2-canvas {
  display: block;
  background: #f8fffe;
  touch-action: none;
}

/* Board v2 toolbar layout fix */
.board-v2-toolbar {
  display: flex !important;
  flex-direction: column;
  align-items: stretch !important;
  gap: 5px !important;
  padding: 6px 8px !important;
  overflow: visible !important;
}

.board-v2-toolbar-main,
.board-v2-toolbar-extra {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.board-v2-toolbar-main {
  min-height: 38px;
}

.board-v2-toolbar-extra {
  min-height: 32px;
}

.board-v2-toolbar .board-pan-btn {
  width: auto;
  min-width: 98px;
  padding: 0 10px;
  font-size: 12px;
  white-space: nowrap;
}

.board-v2-toolbar .be-zoom-group {
  display: inline-flex;
  flex-shrink: 0;
  overflow: hidden;
}

.board-v2-toolbar .be-zoom {
  width: 54px;
  min-width: 54px;
  margin: 0;
}

.board-v2-toolbar .board-palette,
.board-v2-toolbar .board-widths {
  display: flex;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .board-v2-toolbar {
    padding: 5px 6px !important;
  }

  .board-v2-toolbar-main,
  .board-v2-toolbar-extra {
    gap: 5px;
  }

  .board-v2-toolbar .board-pan-btn {
    min-width: 88px;
    font-size: 11px;
  }

  .board-v2-toolbar .be-zoom {
    width: 48px;
    min-width: 48px;
  }
}

/* Board v2 laser pointer */
.board-v2-laser {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ff2d2d;
  border: 3px solid rgba(255,255,255,.9);
  box-shadow:
    0 0 0 6px rgba(255,45,45,.22),
    0 0 18px rgba(255,45,45,.85);
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  z-index: 30;
  transition: opacity .12s ease;
}

.board-v2-laser.show {
  opacity: 1;
}