/* ============================================================
   teacher.css — AI Teacher (E.J.AI) for VTA ICT Level 5
   Uses the shared design tokens from style.css (brand red,
   glass cards, radii, shadows). No new colour system.
   ============================================================ */

/* ── Page shell ── */
.teacher-main {
  position: relative;
  min-height: calc(100vh - 64px);
  padding: 0 0 4rem;
  overflow: hidden;
}

/* Ambient red glow, same language as the hero/chat pages */
.teacher-main::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1000px;
  height: 520px;
  background: radial-gradient(ellipse at 50% 0%, rgba(155, 28, 49, 0.16) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.teacher-wrap {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Screen switching */
.teacher-screen { display: none; }
.teacher-screen.active { display: block; animation: fadeSlideUp 0.5s var(--ease-spring) both; }
/* ============================================================
   SETUP SCREEN — choose subject & lesson
   ============================================================ */
/* Two-column hero: intro + "how it works" on the left, live-class panel on the
   right. DOM order is intro → panel → how-works, so on mobile the selector panel
   naturally stacks ABOVE "How your class works". Grid areas restore the desktop look. */
.setup-hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  grid-template-areas:
    "intro panel"
    "works panel";
  column-gap: clamp(1.5rem, 4vw, 3.5rem);
  row-gap: 1.75rem;
  align-items: start;
  padding-top: clamp(1.5rem, 4vw, 3rem);
  min-height: min(76vh, 620px);
}
.setup-intro { grid-area: intro; text-align: left; }
.setup-intro h1 {
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.setup-intro h1 .accent {
  background: linear-gradient(135deg, #ff4d6d 0%, #c0394e 50%, #9B1C31 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.setup-intro .lead {
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 0 1.4rem;
  font-size: 1.05rem;
  line-height: 1.7;
}
.live-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #4ade80;
}
.live-status .live-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #22c55e;
  animation: livePulse 2s ease-in-out infinite;
}
@keyframes livePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
}
.live-status-sm { padding: 0.28rem 0.7rem; font-size: 0.68rem; margin-top: 0.5rem; }
.how-works { grid-area: works; }
.how-works-title {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}
.how-steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  counter-reset: step;
}
.how-steps li {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.85rem 0.3rem 0.6rem;
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-align: center;
}
.how-steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -8px; left: 50%;
  transform: translateX(-50%);
  width: 18px; height: 18px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-bright), var(--primary-color));
  color: #fff;
  font-size: 0.62rem;
  font-weight: 700;
}
.how-steps .hs-ico { font-size: 1.3rem; line-height: 1; }
.how-steps .hs-txt {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.2;
}
.setup-panel {
  grid-area: panel;
  align-self: center;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1.1rem;
}
.setup-teacher {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.25rem;
}
.setup-avatar {
  width: 96px !important;
  height: 96px !important;
  flex-shrink: 0;
  margin: 0 !important;
}
.setup-teacher-meta { text-align: left; }
.setup-teacher-meta .stage-name {
  font-size: 1.3rem; font-weight: 800; line-height: 1.1;
}
.setup-teacher-meta .stage-role {
  font-size: 0.85rem; color: var(--text-secondary);
}
.setup-panel .setup-card { max-width: none; margin: 0; padding: 1.6rem; }
.setup-panel .setup-features { margin: 0.15rem 0 0; justify-content: flex-start; max-width: none; }

.teacher-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 1rem;
  background: rgba(155, 28, 49, 0.1);
  border: 1px solid rgba(155, 28, 49, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  color: #f87171;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}
.teacher-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #f87171;
  box-shadow: 0 0 8px rgba(248, 113, 113, 0.7);
  animation: blink 1.8s ease-in-out infinite;
}

/* Setup heading/lead styles now live in the .setup-intro hero block above. */
/* Setup card holding the selectors */
.setup-card {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  max-width: 560px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-align: left;
}
.setup-field { margin-bottom: 1.25rem; }
.setup-field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}
.setup-field .hint {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 1.1em;
}
.setup-start {
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.95rem 1rem;
  font-size: 1rem;
  font-weight: 700;
}
.setup-start:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Feature chips row under the card */
.setup-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin: 2rem auto 0;
  max-width: 640px;
}
.setup-features .feat {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  background: rgba(155, 28, 49, 0.08);
  border: 1px solid rgba(155, 28, 49, 0.22);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.setup-features .feat span { font-size: 0.95rem; }

/* Lesson concept preview list inside setup */
.lesson-outline {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}
.lesson-outline h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary-bright);
  margin-bottom: 0.6rem;
}
.lesson-outline ul { list-style: none; display: grid; gap: 0.4rem; }
.lesson-outline li {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.lesson-outline li::before {
  content: '';
  flex-shrink: 0;
  width: 6px; height: 6px;
  margin-top: 0.55em;
  border-radius: 50%;
  background: var(--primary-bright);
  box-shadow: 0 0 6px var(--primary-glow);
}
.lesson-outline.empty { display: none; }
/* ============================================================
   CLASS SCREEN — the live lesson
   ============================================================ */
.class-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.25rem 0 1rem;
}
.class-topbar .class-meta { min-width: 0; }
.class-topbar .class-subject {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-bright);
}
.class-topbar .class-lesson {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-color);
  letter-spacing: -0.01em;
}
.class-end-btn {
  flex-shrink: 0;
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
}
.class-topbar-actions { display: flex; gap: 0.6rem; align-items: center; flex-shrink: 0; }

/* Progress bar */
.class-progress {
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 1.5rem;
}
.light-theme .class-progress { background: rgba(0, 0, 0, 0.07); }
.class-progress .bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #9B1C31, #c0394e, #ff4d6d);
  box-shadow: 0 0 12px rgba(155, 28, 49, 0.6);
  border-radius: var(--radius-full);
  transition: width 0.5s var(--ease-out);
}
/* Live metrics row: question counter + concept mastery */
.class-metrics {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: -0.6rem 0 1.5rem;
}
.class-metrics .metric {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.class-metrics .metric-ico { font-size: 0.95rem; }
.class-metrics .metric-mastery b {
  color: var(--primary-bright);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  transition: color 0.3s ease;
}
/* Two-column layout: stage (avatar) + interaction */
.class-grid {
  display: grid;
  grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

/* ── Stage / avatar column ── */
.teacher-stage {
  position: sticky;
  top: 84px;
  /* Submit scrolls UP to this card; clear the sticky navbar so it isn't hidden
     under it (mirrors .feedback's scroll-margin-top). */
  scroll-margin-top: 90px;
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-align: center;
  overflow: hidden;
}
.teacher-stage::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(155, 28, 49, 0.14) 0%, transparent 60%);
  pointer-events: none;
}
.stage-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-color);
  margin-top: 0.5rem;
}
.stage-role {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: rgba(255,255,255,0.03);
}
.status-pill .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--text-muted);
}
.status-pill.is-speaking { color: #4ade80; border-color: rgba(74,222,128,0.4); background: rgba(74,222,128,0.1); }
.status-pill.is-speaking .dot { background: #4ade80; box-shadow: 0 0 8px #4ade80; animation: statusFlash 0.9s ease-in-out infinite; }
.status-pill.is-thinking { color: #fbbf24; border-color: rgba(251,191,36,0.4); background: rgba(251,191,36,0.1); }
.status-pill.is-thinking .dot { background: #fbbf24; box-shadow: 0 0 8px #fbbf24; animation: statusFlash 0.7s ease-in-out infinite; }
.status-pill.is-listening { color: #60a5fa; border-color: rgba(96,165,250,0.4); background: rgba(96,165,250,0.1); }
.status-pill.is-listening .dot { background: #60a5fa; box-shadow: 0 0 8px #60a5fa; animation: statusFlash 0.6s ease-in-out infinite; }
@keyframes statusFlash { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ── Avatar ── */
.teacher-avatar {
  position: relative;
  width: 200px;
  max-width: 62%;
  margin: 0.5rem auto 1rem;
  aspect-ratio: 200 / 220;
}
.avatar-svg { width: 100%; height: 100%; display: block; overflow: visible; }

/* Idle bob for the whole avatar */
.teacher-avatar { animation: avatarFloat 4s ease-in-out infinite; }
@keyframes avatarFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-7px); }
}
.teacher-avatar.state-thinking { animation: avatarThink 3s ease-in-out infinite; }
@keyframes avatarThink {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-3px) rotate(-3deg); }
}

/* Glow halo behind the avatar */
.avatar-glow {
  position: absolute;
  inset: 8% 12% 20%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(155,28,49,0.35) 0%, transparent 70%);
  filter: blur(14px);
  z-index: -1;
  opacity: 0.5;
  transition: opacity 0.3s ease;
}
.teacher-avatar.state-speaking .avatar-glow { opacity: 0.95; animation: glowPulse 1.4s ease-in-out infinite; }
@keyframes glowPulse { 0%,100% { opacity: 0.55; } 50% { opacity: 1; } }
/* Eyes — periodic blink (scaleY). transform-box lets us scale in place. */
.avatar-svg .eye {
  transform-box: fill-box;
  transform-origin: center;
  animation: blinkEye 5s infinite;
}
.avatar-svg .eye.right { animation-delay: 0.05s; }
@keyframes blinkEye {
  0%, 92%, 100% { transform: scaleY(1); }
  95%           { transform: scaleY(0.12); }
}

/* Mouth — talks only while audio is actually playing (is-voicing is toggled
   by TTS onstart/onend in teacher.js, never by the "speaking" state alone). */
.avatar-svg .mouth {
  transform-box: fill-box;
  transform-origin: center;
  transition: transform 0.15s ease;
}
.teacher-avatar.is-voicing .avatar-svg .mouth {
  animation: talk 0.32s ease-in-out infinite;
}
@keyframes talk {
  0%, 100% { transform: scaleY(0.45); }
  50%      { transform: scaleY(1.25); }
}
/* Thinking → small closed mouth, gentle */
.teacher-avatar.state-thinking .avatar-svg .mouth { transform: scaleY(0.5); }

/* Sound rings emitted while speaking */
.sound-rings {
  position: absolute;
  top: 50%; left: 50%;
  width: 10px; height: 10px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
}
.teacher-avatar.state-speaking .sound-rings { opacity: 1; }
.sound-rings span {
  position: absolute;
  top: 50%; left: 50%;
  width: 60px; height: 60px;
  margin: -30px 0 0 -30px;
  border: 2px solid rgba(192, 57, 78, 0.5);
  border-radius: 50%;
  opacity: 0;
}
.teacher-avatar.state-speaking .sound-rings span { animation: ring 1.6s ease-out infinite; }
.teacher-avatar.state-speaking .sound-rings span:nth-child(2) { animation-delay: 0.8s; }
@keyframes ring {
  0%   { transform: scale(0.6); opacity: 0.7; }
  100% { transform: scale(2.6); opacity: 0; }
}
/* Thinking bubble (dots) above the head */
.thinking-bubble {
  position: absolute;
  top: -4px;
  right: 6px;
  display: none;
  gap: 5px;
  padding: 8px 11px;
  background: var(--card-solid);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  z-index: 3;
}
.teacher-avatar.state-thinking .thinking-bubble { display: inline-flex; }
.thinking-bubble span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary-bright);
  animation: dotPulse 1.1s ease-in-out infinite;
}
.thinking-bubble span:nth-child(2) { animation-delay: 0.16s; }
.thinking-bubble span:nth-child(3) { animation-delay: 0.32s; }
@keyframes dotPulse {
  0%, 80%, 100% { opacity: 0.35; transform: translateY(0); }
  40%           { opacity: 1; transform: translateY(-3px); }
}

/* ── Speech (TTS) controls ── */
.speech-controls {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.speech-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.speech-btn:hover {
  border-color: var(--primary-bright);
  background: var(--primary-subtle);
  color: var(--text-color);
}
.speech-btn.is-muted { color: #f87171; border-color: rgba(155,28,49,0.5); background: rgba(155,28,49,0.12); }
.light-theme .speech-btn { background: rgba(0,0,0,0.03); }
/* ── Interaction column ── */
.class-interaction { display: flex; flex-direction: column; gap: 1rem; min-width: 0; }

/* "What the teacher is saying" — speech card */
.teacher-say {
  position: relative;
  background: rgba(18, 22, 30, 0.9);
  border: 1px solid rgba(255,255,255,0.07);
  border-left: 3px solid var(--primary-bright);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  color: var(--text-color);
  font-size: 1rem;
  line-height: 1.7;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  min-height: 3.2rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.light-theme .teacher-say { background: rgba(255,255,255,0.92); border-color: rgba(0,0,0,0.07); }
.teacher-say .say-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-bright);
  margin-bottom: 0.35rem;
}
/* typing caret while text streams in */
.teacher-say.typing .say-text::after {
  content: '▋';
  color: var(--primary-bright);
  animation: caret 0.8s step-end infinite;
  margin-left: 1px;
}
@keyframes caret { 50% { opacity: 0; } }

/* Whiteboard panel */
.teacher-board {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}
.teacher-board.empty { display: none; }
.teacher-board .board-concept {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.teacher-board .board-concept::before { content: '📌'; font-size: 0.95rem; }
.teacher-board .board-points {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}
.teacher-board .board-points li {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.teacher-board .board-points li::before {
  content: '';
  flex-shrink: 0;
  width: 6px; height: 6px;
  margin-top: 0.55em;
  border-radius: 50%;
  background: var(--primary-bright);
  box-shadow: 0 0 6px var(--primary-glow);
}
.teacher-board .board-code {
  margin-top: 0.85rem;
  padding: 0.9rem 1rem;
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  line-height: 1.55;
  color: #e2e8f0;
  overflow-x: auto;
  white-space: pre;
}
.light-theme .teacher-board .board-code { background: rgba(15,23,42,0.92); color: #e2e8f0; }

/* Feedback / verdict card */
.feedback {
  border-radius: var(--radius-md);
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border-color);
  background: var(--card-color);
  animation: fadeSlideUp 0.4s var(--ease-out) both;
  /* Clear the sticky navbar (~64px + padding) when Submit scrolls here. */
  scroll-margin-top: 90px;
}
.feedback.empty { display: none; }
.feedback .verdict {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.55rem;
}
.feedback .verdict::before { font-size: 0.95rem; }
.feedback.correct   { border-color: rgba(74,222,128,0.35); }
.feedback.partial   { border-color: rgba(251,191,36,0.35); }
.feedback.incorrect { border-color: rgba(248,113,113,0.35); }
.feedback.correct   .verdict { color: #4ade80; background: rgba(74,222,128,0.12); }
.feedback.partial   .verdict { color: #fbbf24; background: rgba(251,191,36,0.12); }
.feedback.incorrect .verdict { color: #f87171; background: rgba(248,113,113,0.12); }
.feedback.correct   .verdict::before { content: '✓'; }
.feedback.partial   .verdict::before { content: '≈'; }
.feedback.incorrect .verdict::before { content: '✗'; }
/* Transient "checking…" state (neutral, no verdict colour) shown while grading */
.feedback.checking { border-color: var(--border-color); }
.feedback.checking .verdict { color: var(--text-secondary); background: rgba(148,163,184,0.14); }
.feedback.checking .verdict::before { content: '⋯'; }
.feedback .verdict-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}
/* Question box */
.question-box {
  background: linear-gradient(135deg, rgba(155,28,49,0.12), rgba(155,28,49,0.04));
  border: 1px solid rgba(155,28,49,0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow-sm);
}
.question-box.empty { display: none; }
.question-box .q-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-bright);
  margin-bottom: 0.4rem;
}
.question-box .q-label::before { content: '❓'; }
.question-box .q-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-color);
  line-height: 1.55;
}

/* Answer area */
.answer-area { display: flex; flex-direction: column; gap: 0.65rem; }
.answer-area.hidden { display: none; }

/* Live speech transcript preview */
.transcript {
  display: none;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.55rem 0.85rem;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
  background: rgba(96,165,250,0.06);
  line-height: 1.5;
}
.transcript.active { display: block; }
.transcript .interim { opacity: 0.6; font-style: italic; }

.answer-input-row {
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
}
.answer-area textarea {
  flex: 1;
  min-height: 58px;
  max-height: 200px;
  resize: vertical;
  padding: 0.8rem 0.95rem;
  background: var(--input-bg, rgba(255,255,255,0.04));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-color);
  font-family: inherit;
  font-size: 0.98rem;
  line-height: 1.6;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.answer-area textarea:focus {
  outline: none;
  border-color: var(--primary-bright);
  box-shadow: 0 0 0 3px rgba(155,28,49,0.15);
}
.light-theme .answer-area textarea { background: rgba(0,0,0,0.03); }
.answer-area textarea.nudge { animation: nudgeShake 0.4s ease; border-color: #f87171; }
@keyframes nudgeShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}
/* Mic button */
.mic-btn {
  flex-shrink: 0;
  width: 58px; height: 58px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  font-size: 1.35rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.mic-btn:hover:not(:disabled) {
  border-color: var(--primary-bright);
  background: var(--primary-subtle);
  color: var(--text-color);
}
.mic-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.light-theme .mic-btn { background: rgba(0,0,0,0.03); }
.mic-btn.is-recording {
  color: #fff;
  border-color: var(--primary-bright);
  background: var(--primary-color);
  animation: micPulse 1.3s ease-in-out infinite;
}
@keyframes micPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(155,28,49,0.55); }
  50%      { box-shadow: 0 0 0 8px rgba(155,28,49,0); }
}

/* Action row under textarea */
.answer-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
}
.answer-actions .spacer { flex: 1; }
.answer-actions .hint-btn {
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}
.answer-actions .hint-btn:hover {
  border-color: var(--primary-bright);
  color: var(--text-color);
}
.answer-submit { padding: 0.7rem 1.5rem; font-size: 0.92rem; font-weight: 700; }
.answer-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* Continue button (shown between teaching turns) */
.class-continue { display: flex; justify-content: flex-end; gap: 0.6rem; }
.class-continue.hidden { display: none; }
.continue-btn { padding: 0.7rem 1.6rem; font-size: 0.95rem; font-weight: 700; }

/* Phase chip (Teaching / Practice / Mini Test) */
.phase-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(155,28,49,0.1);
  border: 1px solid rgba(155,28,49,0.28);
  color: var(--primary-bright);
  transition: color 0.25s, background 0.25s, border-color 0.25s;
}
.phase-chip.is-teaching { color: var(--primary-bright); background: rgba(155,28,49,0.12); border-color: rgba(155,28,49,0.3); }
.phase-chip.is-turn { color: #60a5fa; background: rgba(96,165,250,0.12); border-color: rgba(96,165,250,0.4); }
.phase-chip.is-thinking { color: #fbbf24; background: rgba(251,191,36,0.12); border-color: rgba(251,191,36,0.4); }
.phase-chip.is-correct { color: #4ade80; background: rgba(74,222,128,0.14); border-color: rgba(74,222,128,0.45); }
.phase-chip.is-retry { color: #fb923c; background: rgba(251,146,60,0.14); border-color: rgba(251,146,60,0.45); }
.phase-chip.is-challenge {
  color: #fff;
  background: linear-gradient(135deg, #c0394e, #9B1C31);
  border-color: transparent;
  box-shadow: 0 0 14px rgba(192,57,78,0.5);
  animation: chipFlash 1.2s ease-in-out infinite;
}
@keyframes chipFlash { 0%,100% { box-shadow: 0 0 10px rgba(192,57,78,0.4); } 50% { box-shadow: 0 0 20px rgba(192,57,78,0.75); } }
.phase-chip.pop { animation: chipPop 0.4s var(--ease-spring); }
@keyframes chipPop { 0% { transform: scale(0.82); } 60% { transform: scale(1.12); } 100% { transform: scale(1); } }
/* ============================================================
   RESULTS SCREEN — the report card
   ============================================================ */
.results-wrap { padding-top: 2.5rem; }
.results-head { text-align: center; margin-bottom: 2.5rem; }
.results-head .results-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-bright);
  margin-bottom: 0.5rem;
}
.results-head h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.results-head p { color: var(--text-secondary); margin-top: 0.5rem; }
.results-trophy { font-size: 1.2em; filter: drop-shadow(0 0 6px rgba(251,191,36,0.5)); }

/* Top row: score ring + quick stats */
.results-top {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: stretch;
  margin-bottom: 1.5rem;
}

.score-card {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-md);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.score-ring {
  position: relative;
  width: 160px; height: 160px;
  margin-bottom: 1rem;
}
.score-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.score-ring .track { fill: none; stroke: var(--border-color); stroke-width: 12; }
.score-ring .fill {
  fill: none;
  stroke: url(#scoreGrad);
  stroke-width: 12;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.1s var(--ease-out);
}
.score-ring .score-num {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.score-ring .score-num b { font-size: 2.4rem; font-weight: 800; line-height: 1; }
.score-ring .score-num small { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-top: 0.2rem; }
.score-card .score-grade { font-size: 1.05rem; font-weight: 700; color: var(--text-color); }
.score-card .score-sub { font-size: 0.85rem; color: var(--text-secondary); margin-top: 0.2rem; }
/* Quick stat tiles */
.results-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.stat-tile {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  justify-content: center;
}
.stat-tile .stat-ico { font-size: 1.3rem; }
.stat-tile .stat-val { font-size: 1.6rem; font-weight: 800; color: var(--text-color); line-height: 1; }
.stat-tile .stat-lbl { font-size: 0.8rem; color: var(--text-secondary); }

/* Concept breakdown: understood vs practice */
.concept-cols {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
.concept-panel {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--shadow-sm);
}
.concept-panel h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.concept-panel.good h3 { color: #4ade80; }
.concept-panel.work h3 { color: #fbbf24; }
.concept-panel ul { list-style: none; display: grid; gap: 0.6rem; }
.concept-panel li {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.concept-panel.good li::before { content: '✓'; color: #4ade80; font-weight: 700; flex-shrink: 0; }
.concept-panel.work li::before { content: '○'; color: #fbbf24; font-weight: 700; flex-shrink: 0; }
.concept-panel .none { font-size: 0.88rem; color: var(--text-muted); font-style: italic; }
/* Recommendation card */
.reco-card {
  background: linear-gradient(135deg, rgba(155,28,49,0.14), rgba(155,28,49,0.03));
  border: 1px solid rgba(155,28,49,0.3);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.6rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}
.reco-card .reco-ico {
  flex-shrink: 0;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: rgba(155,28,49,0.18);
  border: 1px solid rgba(155,28,49,0.4);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.reco-card .reco-body { flex: 1; min-width: 200px; }
.reco-card .reco-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-bright);
  margin-bottom: 0.25rem;
}
.reco-card .reco-title { font-size: 1.15rem; font-weight: 700; color: var(--text-color); }
.reco-card .reco-sub { font-size: 0.88rem; color: var(--text-secondary); margin-top: 0.2rem; }
.reco-card .reco-go { flex-shrink: 0; padding: 0.7rem 1.4rem; font-weight: 700; }

/* Results actions */
.results-actions {
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
}
.results-actions .btn { padding: 0.8rem 1.6rem; font-weight: 700; }
/* ============================================================
   RESPONSIVE — stack layout below 900px, tighten on phones
   ============================================================ */
@media (max-width: 900px) {
  /* Setup → single column: intro, then the selector panel, then "how it works" */
  .setup-hero {
    grid-template-columns: 1fr;
    grid-template-areas: "intro" "panel" "works";
    gap: 1.75rem;
    min-height: 0;
    padding-top: 1.5rem;
  }
  .setup-intro { text-align: center; }
  .setup-intro .lead { margin-left: auto; margin-right: auto; }
  .how-works { max-width: 560px; margin-left: auto; margin-right: auto; }
  .setup-panel { max-width: 560px; margin: 0 auto; width: 100%; }
  .setup-teacher { justify-content: center; }
  .setup-panel .setup-features { justify-content: center; }
  /* Class → single column with a compact stage header */
  .class-grid { grid-template-columns: 1fr; }
  .teacher-stage {
    position: static;
    top: auto;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "avatar name"
      "avatar status"
      "controls controls";
    gap: 0.5rem 1rem;
    text-align: left;
    align-items: center;
  }
  .teacher-avatar { grid-area: avatar; margin: 0; width: 132px; }
  .stage-name { grid-area: name; margin-top: 0; align-self: end; }
  .stage-role { display: none; }
  .teacher-stage .status-pill { grid-area: status; justify-self: start; align-self: start; }
  .speech-controls { grid-area: controls; justify-content: flex-start; margin-top: 0.75rem; }
  .results-top { grid-template-columns: 1fr; }
  .concept-cols { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .teacher-wrap { padding: 0 16px; }
  .setup-hero { padding-top: 1rem; gap: 1.4rem; }
  /* Mobile: drop the long lead, let the badge sit above a larger teacher/avatar area */
  .setup-intro .lead { display: none; }
  .setup-avatar { width: 116px !important; height: 116px !important; }
  .setup-teacher-meta .stage-name { font-size: 1.45rem; }
  .how-steps { grid-template-columns: repeat(3, 1fr); column-gap: 0.5rem; row-gap: 0.9rem; }
  .setup-panel .setup-card { padding: 1.35rem 1.15rem; }
  .class-topbar { padding: 1rem 0 0.75rem; align-items: flex-start; gap: 0.75rem; }
  .class-topbar .class-lesson { font-size: 1.05rem; }
  .class-topbar-actions { width: 100%; justify-content: space-between; }
  .class-metrics { margin-bottom: 1.1rem; }
  .results-stats { grid-template-columns: repeat(2, 1fr); }
  .reco-card { flex-direction: column; align-items: flex-start; text-align: left; }
  .reco-card .reco-go { width: 100%; text-align: center; }
  .answer-input-row { flex-direction: column; align-items: stretch; }
  .mic-btn { width: 100%; height: 52px; font-size: 1.2rem; }
  .answer-actions { flex-direction: column; }
  .answer-actions .spacer { display: none; }
  .answer-actions .answer-submit { width: 100%; padding: 0.9rem; font-size: 1rem; }
  .speech-btn { width: 44px; height: 44px; }
}

@media (max-width: 430px) {
  .teacher-wrap { padding: 0 14px; }
  .setup-teacher { flex-direction: column; text-align: center; gap: 0.85rem; }
  .setup-teacher-meta { text-align: center; }
  .setup-avatar { width: 132px !important; height: 132px !important; }
  .answer-submit { font-size: 0.95rem; }
}
@media (max-width: 380px) {
  .teacher-wrap { padding: 0 12px; }
  .setup-panel .setup-card { padding: 1.15rem 0.95rem; }
  .teacher-say, .teacher-board, .question-box, .feedback { padding: 0.85rem 0.9rem; }
  .score-ring { width: 140px; height: 140px; }
  .score-ring .score-num b { font-size: 2rem; }
  .setup-features { gap: 0.45rem; }
  .teacher-avatar { width: 120px; }
}
@media (max-width: 340px) {
  .how-steps { grid-template-columns: repeat(2, 1fr); }
  .class-topbar-actions { width: 100%; justify-content: space-between; }
}
/* ============================================================
   ACCESSIBILITY — respect reduced-motion preferences
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .teacher-avatar,
  .teacher-avatar.state-thinking,
  .avatar-glow,
  .teacher-avatar.state-speaking .avatar-glow,
  .avatar-svg .eye,
  .teacher-avatar.is-voicing .avatar-svg .mouth,
  .teacher-avatar.state-speaking .sound-rings span,
  .thinking-bubble span,
  .status-pill .dot,
  .teacher-badge::before,
  .mic-btn.is-recording,
  .live-status .live-dot,
  .phase-chip.is-challenge,
  .phase-chip.pop,
  .teacher-say.typing .say-text::after {
    animation: none !important;
  }
  .teacher-screen.active { animation: none; }
  .score-ring .fill { transition: none; }
  * { scroll-behavior: auto !important; }
}

/* Screen-reader-only helper (for ARIA labels/status) */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}