/* ============================================================
   UniVoice Design Tokens
   화면에 종속되지 않는 공통 토큰 — 태블릿 홈 / PDF·자막 화면에서 재사용.
   컴포넌트: .btn(-primary/-secondary/-danger/-ghost), .card,
             .status-badge(+tone), .icon-btn, .chip, .field
   ============================================================ */
:root {
  /* color */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-sunken: #f1f5f9;
  --color-primary: #2563eb;
  --color-primary-strong: #1d4ed8;
  --color-primary-soft: #eff6ff;
  --color-accent: #14b8a6;
  --color-accent-soft: #f0fdfa;
  --color-text: #0f172a;
  --color-text-secondary: #64748b;
  --color-text-tertiary: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-danger: #b91c1c;
  --color-danger-soft: #fef2f2;
  --color-warning: #b45309;
  --color-warning-soft: #fffbeb;
  --color-success: #15803d;
  --color-success-soft: #f0fdf4;
  --color-danger-border: #fecaca;
  --color-danger-hover: #fee2e2;
  --color-warning-border: #fde68a;
  --color-accent-strong: #0f766e;
  --color-on-primary: #ffffff;

  /* typography */
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", Roboto, sans-serif;
  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-md: 15px;
  --fs-lg: 17px;
  --fs-xl: 20px;
  --fs-2xl: 24px;
  --lh-tight: 1.3;
  --lh-body: 1.55;

  /* spacing */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;

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

  /* elevation */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 2px 8px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.12);

  /* misc */
  --touch-target: 44px;
  --app-bar-h: 60px;
  --bottom-nav-h: 64px;
}

/* ── base ─────────────────────────────────────────────────── */
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
img { max-width: 100%; }
.hidden { display: none !important; }

/* 키보드 focus — 마우스 클릭에는 뜨지 않고 키보드 탐색에만 보인다 */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── Button ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: var(--touch-target);
  padding: 10px var(--sp-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--fs-md);
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); box-shadow: var(--shadow-sm); }
.btn-primary:not(:disabled):hover { background: var(--color-primary-strong); }
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn-secondary:not(:disabled):hover { background: var(--color-surface-sunken); }
.btn-danger { background: var(--color-danger-soft); color: var(--color-danger); border-color: var(--color-danger-border); }
.btn-danger:not(:disabled):hover { background: var(--color-danger-hover); }
.btn-ghost { color: var(--color-text-secondary); }
.btn-ghost:not(:disabled):hover { color: var(--color-text); background: var(--color-surface-sunken); }
.btn-block { width: 100%; }
.btn-lg { min-height: 52px; font-size: var(--fs-lg); border-radius: var(--radius-md); }
.btn-sm { min-height: 36px; padding: 6px var(--sp-3); font-size: var(--fs-sm); border-radius: var(--radius-sm); }

/* 시각 크기가 44px 미만인 컨트롤은 보이지 않는 히트 영역을 넓혀
   최소 터치 타깃(44x44)을 보장한다 */
.btn-sm, .material-remove, .dialog-close {
  position: relative;
}
.btn-sm::after, .material-remove::after, .dialog-close::after {
  content: "";
  position: absolute;
  inset: -6px;
}

/* ── IconButton ───────────────────────────────────────────── */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target);
  height: var(--touch-target);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  font-weight: 700;
  flex: none;
}
.icon-btn:hover { background: var(--color-surface-sunken); color: var(--color-text); }
.icon-btn svg { width: 20px; height: 20px; }

/* ── Card ─────────────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* ── StatusBadge ──────────────────────────────────────────── */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: 700;
  background: var(--color-surface-sunken);
  color: var(--color-text-secondary);
  white-space: nowrap;
}
.status-badge i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}
.status-badge.is-live { background: var(--color-success-soft); color: var(--color-success); }
.status-badge.is-info { background: var(--color-primary-soft); color: var(--color-primary); }
.status-badge.is-warn { background: var(--color-warning-soft); color: var(--color-warning); }
.status-badge.is-error { background: var(--color-danger-soft); color: var(--color-danger); }
.status-badge.is-live i { animation: badge-pulse 1.6s ease-in-out infinite; }

@keyframes badge-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ── Chip (정보 표시용 — 클릭 불가) ────────────────────────── */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 6px var(--sp-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}
/* 번역 언어 표시는 화면 공통으로 accent(민트) 톤을 쓴다 */
.chip.accent {
  background: var(--color-accent-soft);
  border-color: transparent;
  color: var(--color-accent-strong);
}

/* ── Field ────────────────────────────────────────────────── */
label, legend {
  display: grid;
  gap: 6px;
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  font-weight: 600;
}
input, select, textarea {
  width: 100%;
  min-height: var(--touch-target);
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  color: var(--color-text);
  background: var(--color-surface);
}
input::placeholder, textarea::placeholder { color: var(--color-text-tertiary); }
input:focus, select:focus, textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
textarea { resize: vertical; }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
legend { margin-bottom: var(--sp-2); }

/* ── mode switch (데모용 플로팅 토글) ─────────────────────── */
.mode-switch {
  position: fixed;
  z-index: 50;
  right: var(--sp-4);
  /* 앱바 우측 버튼(로그아웃/QR)과 겹치지 않도록 앱바 아래에 띄운다 */
  top: calc(var(--app-bar-h) + var(--sp-3));
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 7px 14px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-md);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--color-text-secondary);
}

/* ============================================================
   교수 모바일 프레임
   ============================================================ */
.professor-app { min-height: 100vh; }
.phone-page {
  position: relative;
  width: min(100%, 480px);
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: var(--sp-4) var(--sp-4) calc(var(--bottom-nav-h) + var(--sp-6) + env(safe-area-inset-bottom));
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
@media (min-width: 520px) {
  .phone-page { border-left: 1px solid var(--color-border); border-right: 1px solid var(--color-border); }
}

/* ── App bar (56–64px) ───────────────────────────────────── */
.app-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--app-bar-h);
  margin: calc(var(--sp-4) * -1) calc(var(--sp-4) * -1) 0;
  padding: var(--sp-2) var(--sp-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.app-bar-logo { width: 32px; height: 32px; object-fit: contain; flex: none; }
.app-bar-title { flex: 1; min-width: 0; }
.app-bar-title h1 {
  margin: 0;
  font-size: var(--fs-lg);
  line-height: var(--lh-tight);
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.app-bar-sub {
  margin: 1px 0 0;
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Bottom navigation ───────────────────────────────────── */
.phone-nav {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: min(100%, 480px);
  display: flex;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 20;
}
.phone-nav button {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-height: var(--bottom-nav-h);
  padding: var(--sp-2) 0;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-tertiary);
}
.phone-nav button svg { width: 22px; height: 22px; }
.phone-nav button.active { color: var(--color-primary); }

/* ── 로그인 ───────────────────────────────────────────────── */
.auth-page { justify-content: flex-start; }
.auth-copy { margin: var(--sp-8) 0 var(--sp-2); }
.auth-copy p { margin: 0; color: var(--color-primary); font-weight: 700; font-size: var(--fs-sm); }
.auth-copy h1 { margin: var(--sp-2) 0 0; font-size: var(--fs-2xl); letter-spacing: -0.02em; }
.login-card { display: grid; gap: var(--sp-4); padding: var(--sp-6); }

/* ── 수업 준비 ────────────────────────────────────────────── */
.setup-card { display: grid; gap: var(--sp-4); padding: var(--sp-5); }
.locale-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: var(--sp-2); }
.locale-option { position: relative; display: block; }
.locale-option input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; margin: 0; cursor: pointer; }
.locale-option > span,
.locale-option > span > span {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-height: var(--touch-target);
  justify-content: center;
}
.locale-option > span {
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text);
}
.locale-option small { color: var(--color-text-secondary); font-weight: 500; }
.locale-option b { font-size: var(--fs-md); }
.locale-option input:checked + span {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
}
.locale-option input:focus-visible + span {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.materials-head { display: flex; align-items: baseline; justify-content: space-between; }
.materials-head h2 { margin: 0; font-size: var(--fs-md); }
.materials-head span { color: var(--color-text-secondary); font-size: var(--fs-xs); }
.material-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--sp-2); }
.material-list li {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-sunken);
  font-size: var(--fs-sm);
}
.material-empty { color: var(--color-text-secondary); justify-content: center; }
.material-name {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.material-status { font-weight: 700; font-size: var(--fs-xs); white-space: nowrap; }
.material-status.pending { color: var(--color-text-secondary); }
.material-status.processing { color: var(--color-warning); }
.material-status.done { color: var(--color-success); }
.material-status.failed { color: var(--color-danger); }
.material-remove {
  min-height: 32px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  flex: none;
}
.material-remove:hover { color: var(--color-danger); border-color: var(--color-danger-border); }
.material-form { display: grid; gap: var(--sp-2); }
.material-options { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-2); }
.material-preview-status { font-size: var(--fs-xs); font-weight: 700; white-space: nowrap; }
.material-preview-status.pending { color: var(--color-warning); }
.material-preview-status.failed { color: var(--color-danger); }
.live-material-card { display: grid; gap: var(--sp-2); }
.live-material-hint { margin: 0; font-size: var(--fs-xs); color: var(--color-text-secondary); }

/* ============================================================
   교수 라이브 (모바일 강의실)
   ============================================================ */

/* 강의 자료 행 */
.material-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  text-decoration: none;
  color: inherit;
}
.material-row-icon {
  width: 40px;
  height: 40px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-danger-soft);
  color: var(--color-danger);
}
.material-row-icon svg { width: 22px; height: 22px; }
.material-row-body { flex: 1; min-width: 0; }
.material-row-name {
  display: block;
  font-weight: 600;
  font-size: var(--fs-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.material-row-meta {
  display: block;
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.material-row-open {
  flex: none;
  min-height: 36px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-primary);
}

/* 실시간 번역 상태 카드 */
.live-card { padding: var(--sp-5); display: grid; gap: var(--sp-4); }
.live-card-head { display: flex; align-items: center; gap: var(--sp-3); }
.live-card-head .elapsed {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: var(--fs-lg);
}
.live-actions { display: grid; grid-template-columns: 1fr; gap: var(--sp-2); }
.live-actions .btn-secondary { justify-self: stretch; }
.status-line {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
}
.status-line b { color: var(--color-text); font-weight: 600; overflow-wrap: anywhere; }

/* 언어 방향 (정보성 — 세션 시작 시 고정) */
.lang-route {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-sm);
}
.lang-route .arrow { color: var(--color-text-tertiary); flex: none; }
.lang-route-note {
  flex-basis: 100%;
  margin: 2px 0 0;
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
}
.lang-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: var(--color-surface-sunken);
  font-weight: 600;
  min-width: 0;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lang-pill small { color: var(--color-text-secondary); font-weight: 500; }
.lang-pill.accent { background: var(--color-accent-soft); color: var(--color-accent-strong); }

/* ============================================================
   자막 목록 (교수 원문 / 학생 번역 공용)
   ============================================================ */
.caption-panel {
  position: relative; /* .jump-latest 의 하단 고정 기준 */
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1;
  overflow: hidden;
}
.caption-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--color-border);
}
.caption-panel-head h2 { margin: 0; font-size: var(--fs-md); }

.caption-scroll {
  position: relative;
  flex: 1;
  min-height: 180px;
  overflow-y: auto;
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  /* smooth 스크롤은 JS(scrollTo)가 prefers-reduced-motion 을 보고 명시적으로
     제어한다 — CSS 로 중복 선언하면 직접 scrollTop 제어까지 애니메이션된다. */
}
/* 교수 화면은 페이지가 세로 스크롤되므로 자막 목록에 자체 높이 상한을 둔다 */
#professor-live .caption-scroll { max-height: 45vh; }

/* 발화 아이템 — 최신(:last-child 계열)은 강조, 이전은 저명도 */
.caption,
.prof-utterance {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: var(--sp-3) var(--sp-4);
  display: grid;
  gap: 3px;
  opacity: 0.62;
  overflow-wrap: anywhere;
}
.caption-meta {
  display: flex;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
}
.caption-meta .speaker { font-weight: 700; color: var(--color-text-secondary); }
.caption .translated { font-size: var(--fs-lg); font-weight: 600; line-height: var(--lh-body); }
.caption .source { font-size: var(--fs-sm); color: var(--color-text-secondary); }
.caption time, .prof-utterance time { font-size: var(--fs-xs); color: var(--color-text-secondary); }
.caption.fallback { border-color: var(--color-warning-border); background: var(--color-warning-soft); }
.fallback-note { font-size: var(--fs-xs); color: var(--color-warning); font-weight: 600; }
/* 말하는 도중의 임시 번역. 확정 자막과 구분되게 흐리고 점선 테두리로 둔다. */
.caption-scroll > .caption.draft,
.caption-scroll > .caption.draft:last-of-type {
  opacity: 0.8;
  border-style: dashed;
  border-color: var(--color-border-strong);
  box-shadow: none;
}
.caption.draft .translated { font-style: italic; color: var(--color-text-secondary); }

.caption-scroll > .caption:last-of-type,
.caption-scroll > .prof-utterance.latest {
  opacity: 1;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
.caption-empty {
  margin: auto;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  padding: var(--sp-6) 0;
}
.prof-utterance .partial {
  display: block;
  color: var(--color-text-secondary);
  font-style: italic;
}
.prof-utterance .partial:empty { display: none; }

/* "최신 자막으로" 점프 버튼 — 자동 스크롤 일시정지 중에만 표시 */
.jump-latest {
  position: absolute;
  left: 50%;
  bottom: var(--sp-3);
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: var(--fs-sm);
  font-weight: 700;
  box-shadow: var(--shadow-lg);
  z-index: 5;
}
/* ============================================================
   학생 화면
   ============================================================ */
.student-app { min-height: 100vh; }

/* ── 태블릿 홈 대시보드: sidebar + content 그리드 ─────────── */
.student-dashboard {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--color-bg);
}
.student-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  padding: var(--sp-5) var(--sp-3);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
}
.sidebar-logo { width: 104px; padding: 0 var(--sp-2); align-self: flex-start; }
.sidebar-nav { display: grid; gap: var(--sp-1); }
.sidebar-nav button {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--touch-target);
  padding: 0 var(--sp-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-align: left;
}
.sidebar-nav button svg { width: 20px; height: 20px; flex: none; }
.sidebar-nav button span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-nav button:hover { background: var(--color-surface-sunken); color: var(--color-text); }
.sidebar-nav button.active { background: var(--color-primary-soft); color: var(--color-primary); }

/* compact profile — 메뉴(로그인/로그아웃, 개인정보 수정)는 위로 펼쳐진다 */
.profile-menu { margin-top: auto; position: relative; }
.profile-menu summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: var(--touch-target);
  padding: var(--sp-2);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}
.profile-menu summary::-webkit-details-marker { display: none; }
.profile-menu summary:hover { background: var(--color-surface-sunken); }
.profile-menu[open] summary { border-color: var(--color-border); }
.profile-summary-text { flex: 1; min-width: 0; display: grid; }
.profile-summary-text strong {
  font-size: var(--fs-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.profile-summary-text small {
  color: var(--color-text-secondary);
  font-size: var(--fs-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.profile-chevron { width: 16px; height: 16px; color: var(--color-text-tertiary); flex: none; transition: transform 0.15s; }
.profile-menu[open] .profile-chevron { transform: rotate(180deg); }
.profile-menu-items {
  position: absolute;
  bottom: calc(100% + var(--sp-2));
  left: 0;
  right: 0;
  display: grid;
  gap: 2px;
  padding: var(--sp-1);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  z-index: 15;
}
.profile-menu-items button {
  min-height: 40px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-sm);
  text-align: left;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text);
}
.profile-menu-items button:hover:not(:disabled) { background: var(--color-surface-sunken); }
.profile-menu-items button:disabled { color: var(--color-text-tertiary); cursor: not-allowed; }
.profile-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
  overflow: hidden;
  flex: none;
}
.profile-icon span::before { content: "\1F464"; font-size: 16px; }

/* ── 메인 영역 ────────────────────────────────────────────── */
.dashboard-content {
  min-width: 0;
  width: 100%;
  max-width: 960px;
  padding: var(--sp-8) var(--sp-6);
  display: grid;
  gap: var(--sp-5);
  align-content: start;
}
.dashboard-greeting h1 { margin: 0; font-size: var(--fs-2xl); letter-spacing: -0.02em; overflow-wrap: anywhere; }
.dashboard-greeting p { margin: var(--sp-1) 0 0; color: var(--color-text-secondary); font-size: var(--fs-sm); }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-2); flex-wrap: wrap; }
.section-head h2 { margin: 0; font-size: var(--fs-md); }

/* 오늘의 강의 (최우선 섹션) */
.lecture-hero { padding: var(--sp-5); display: grid; gap: var(--sp-4); }
.lecture-row { display: flex; align-items: center; gap: var(--sp-3); }
.lecture-row-icon {
  width: 44px;
  height: 44px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}
.lecture-row-icon svg { width: 24px; height: 24px; }
.lecture-row-body { flex: 1; min-width: 0; display: grid; gap: 1px; }
.lecture-row-name { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lecture-row-meta {
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.token-field { font-size: var(--fs-xs); }
.token-field textarea { font-size: var(--fs-sm); }

/* 2-column 콘텐츠 */
.dashboard-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-5);
  align-items: start;
}
.recent-card, .settings-summary { padding: var(--sp-5); display: grid; gap: var(--sp-3); align-content: start; }
.recent-list { display: grid; gap: var(--sp-2); font-size: var(--fs-sm); }
.recent-list > p { margin: 0; }
.recent-list > small, .recent-item small { color: var(--color-text-secondary); font-size: var(--fs-xs); }
.recent-item {
  display: grid;
  gap: 2px;
  margin: 0;
  padding-bottom: var(--sp-2);
  border-bottom: 1px dashed var(--color-border);
  overflow-wrap: anywhere;
}
.recent-item:last-of-type { border-bottom: 0; padding-bottom: 0; }
.recent-item p { margin: 0; }

/* 통역/보기 설정 compact summary */
.language-route { display: flex; align-items: center; gap: var(--sp-4); flex-wrap: wrap; font-size: var(--fs-sm); }
.language-route > div { display: grid; gap: 2px; min-width: 0; }
.language-route strong { overflow-wrap: anywhere; }
.language-route small { color: var(--color-text-secondary); }
.language-route .arrow { color: var(--color-text-tertiary); }
.locale-details summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-primary);
}
.locale-details summary::-webkit-details-marker { display: none; }
.locale-details summary::after { content: "\25BE"; margin-left: 6px; }
.locale-details[open] summary::after { content: "\25B4"; }
.locale-details fieldset { margin-top: var(--sp-2); }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.student-locale-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--sp-2);
}
.student-locale-list .locale-option > span { flex-direction: row; align-items: center; gap: var(--sp-2); }
.student-locale-list .locale-option b {
  width: 30px;
  height: 30px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-surface-sunken);
  font-size: var(--fs-xs);
}

/* 좁은 태블릿: 아이콘 rail + 1-column */
@media (max-width: 1023px) {
  .student-dashboard { grid-template-columns: 72px minmax(0, 1fr); }
  .student-sidebar { padding: var(--sp-4) var(--sp-2); align-items: center; }
  .sidebar-logo { width: 40px; padding: 0; align-self: center; }
  .sidebar-nav { width: 100%; }
  .sidebar-nav button { justify-content: center; padding: 0; }
  .sidebar-nav button span { display: none; }
  .profile-menu { width: 100%; }
  .profile-menu summary { justify-content: center; padding: var(--sp-1); }
  .profile-summary-text, .profile-chevron { display: none; }
  .profile-menu-items { left: 0; right: auto; min-width: 200px; }
  .dashboard-columns { grid-template-columns: 1fr; }
  .dashboard-content { padding: var(--sp-5) var(--sp-4); }
}

/* 모바일 폭: 상단 바 형태 */
@media (max-width: 640px) {
  .student-dashboard { grid-template-columns: 1fr; }
  .student-sidebar {
    position: static;
    height: auto;
    flex-direction: row;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-3);
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }
  .sidebar-logo { width: 36px; align-self: center; }
  .sidebar-nav { display: flex; flex: 1; width: auto; }
  .profile-menu { margin: 0 0 0 auto; width: auto; }
  .profile-menu-items {
    left: auto;
    right: 0;
    bottom: auto;
    top: calc(100% + var(--sp-2));
    min-width: 200px;
  }
}
/* ── 학생 라이브: 슬라이드 뷰어 + 자막 (split / bottom overlay) ── */
.student-translation {
  display: flex;
  flex-direction: column;
  /* 자막 패널이 내부 스크롤을 갖도록 뷰포트에 고정한다 — 페이지 자체는 안 늘어난다 */
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  padding: var(--sp-4);
  padding-bottom: calc(var(--sp-4) + env(safe-area-inset-bottom));
  gap: var(--sp-3);
}

/* 상단 toolbar */
.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--app-bar-h);
  padding: var(--sp-2) var(--sp-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  flex: none;
}
.slide-header { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.slide-header h1 {
  margin: 0;
  font-weight: 700;
  font-size: var(--fs-lg);
  line-height: var(--lh-tight);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.slide-header span {
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toolbar-status { max-width: 220px; flex: none; }
.toolbar-status span { overflow: hidden; text-overflow: ellipsis; }
.toolbar-lang { flex: none; max-width: 240px; }
.toolbar-lang svg { width: 15px; height: 15px; flex: none; }
.toolbar-lang span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.toolbar-lang small { color: var(--color-text-secondary); white-space: nowrap; }

/* 더보기 드롭다운 (아래로 펼쳐짐) */
.more-menu { position: relative; flex: none; }
.more-menu summary { list-style: none; }
.more-menu summary::-webkit-details-marker { display: none; }
.more-menu-items {
  position: absolute;
  top: calc(100% + var(--sp-2));
  right: 0;
  min-width: 160px;
  display: grid;
  gap: 2px;
  padding: var(--sp-1);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  z-index: 25;
}
.more-menu-items button {
  min-height: 40px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-sm);
  text-align: left;
  font-size: var(--fs-sm);
  font-weight: 600;
}
.more-menu-items button:hover { background: var(--color-surface-sunken); }

/* 메인: 슬라이드 + 자막 split (≥1024px) */
.viewer-main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(280px, 32%, 420px);
  gap: var(--sp-4);
}
#student-live.transcript-closed .viewer-main { grid-template-columns: minmax(0, 1fr); }
#student-live.transcript-closed .transcript-panel { display: none; }

/* 슬라이드/PDF 영역 — 뷰어 adapter 가 마운트되기 전에는 empty state */
.viewer-stage {
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
}
.slide-viewer {
  position: relative;
  width: 100%;
  height: 100%;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* 자료 탭: 과목 자료가 여러 개면 가로 스크롤 칩으로 고른다 */
.material-tabs {
  flex: none;
  display: flex;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  overflow-x: auto;
  border-bottom: 1px solid var(--color-border);
  scrollbar-width: thin;
}
.material-tab {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  max-width: 260px;
  min-height: 36px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font: inherit;
  font-size: var(--fs-sm);
  cursor: pointer;
}
.material-tab.active {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
  font-weight: 600;
}
.material-tab-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.material-tab-status { font-size: var(--fs-xs); font-weight: 700; white-space: nowrap; }
.material-tab-status.pending { color: var(--color-warning); }
.material-tab-status.failed { color: var(--color-danger); }

/* PDF 페이지 canvas 가 놓이는 무대 — 남는 높이를 모두 차지하고 가운데 정렬 */
.slide-stage {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-sunken);
}
.slide-canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
  background: #fff;
  box-shadow: var(--shadow-md);
}
.slide-loading {
  position: absolute;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}
.slide-page-label {
  min-width: 56px;
  text-align: center;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  font-variant-numeric: tabular-nums;
}

/* 강의안 넘김 컨트롤 — 슬라이드 위에 떠 있고, 자막 패널을 가리지 않게 하단 중앙 */
.slide-nav {
  position: absolute;
  left: 50%;
  bottom: var(--sp-3);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}
.slide-nav .icon-btn { width: 36px; height: 36px; border-color: transparent; }
.slide-nav .icon-btn:disabled { opacity: 0.35; cursor: not-allowed; background: none; }
.slide-empty {
  display: grid;
  gap: var(--sp-2);
  justify-items: center;
  text-align: center;
  padding: var(--sp-8) var(--sp-5);
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
}
.slide-empty svg { width: 44px; height: 44px; color: var(--color-text-tertiary); }
.slide-empty strong { color: var(--color-text); font-size: var(--fs-md); }
.slide-empty p { margin: 0; }

/* 자막 패널 공통 (caption-panel 컴포넌트 재사용) */
.transcript-panel { min-height: 0; }
.caption-panel-actions { display: flex; align-items: center; gap: var(--sp-1); }
.caption-panel-actions .icon-btn { width: 36px; height: 36px; border: 0; }
.overlay-only { display: none; }

/* 자막 닫힘 상태에서 다시 여는 고정 버튼 */
.transcript-reopen {
  position: fixed;
  right: var(--sp-4);
  bottom: calc(var(--sp-4) + env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: var(--touch-target);
  padding: 10px var(--sp-4);
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: var(--fs-sm);
  font-weight: 700;
  box-shadow: var(--shadow-lg);
  z-index: 30;
}
.transcript-reopen svg { width: 18px; height: 18px; }

/* ── 좁은 화면(<1024px): 자막을 bottom overlay 로 전환 ────── */
@media (max-width: 1023px) {
  .viewer-main { display: flex; flex-direction: column; position: relative; }
  .viewer-stage { flex: 1; min-height: 0; }
  .transcript-panel {
    position: absolute;
    left: var(--sp-4);
    right: var(--sp-4);
    bottom: calc(var(--sp-2) + env(safe-area-inset-bottom));
    max-height: 42%;
    box-shadow: var(--shadow-lg);
  }
  .overlay-only { display: inline-flex; }
  /* open(목록) 상태에서는 '펼치기' 버튼이, minimized 에서는 '최소화' 버튼이 숨는다 */
  #student-live:not(.transcript-minimized) .transcript-panel #transcript-expand { display: none; }
  #student-live.transcript-minimized .transcript-panel #transcript-minimize { display: none; }
  #student-live.transcript-minimized .transcript-panel #autoscroll-toggle { display: none; }

  /* 최소화: 최신 발화 1건만, 원문·번역 각 2줄로 제한 */
  #student-live.transcript-minimized .transcript-panel { max-height: none; }
  #student-live.transcript-minimized .caption-scroll {
    flex: none;
    min-height: 0;
    overflow: hidden;
    padding-top: 0;
  }
  #student-live.transcript-minimized .caption-scroll .caption:not(:last-of-type) { display: none; }
  #student-live.transcript-minimized .caption .translated,
  #student-live.transcript-minimized .caption .source {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
  }
  #student-live.transcript-minimized .caption { border: 0; box-shadow: none; padding: var(--sp-2) 0; }
  #student-live.transcript-minimized .jump-latest { display: none; }
}

.audio-unlock {
  position: fixed;
  inset: auto var(--sp-4) calc(var(--sp-6) + env(safe-area-inset-bottom));
  left: var(--sp-4);
  display: grid;
  gap: 2px;
  justify-items: center;
  padding: var(--sp-4);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: var(--color-on-primary);
  font-size: var(--fs-md);
  font-weight: 700;
  box-shadow: var(--shadow-lg);
  z-index: 40;
}
.audio-unlock small { font-weight: 500; color: #cbd5e1; }

/* ============================================================
   다이얼로그 / 토스트
   ============================================================ */
dialog {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-6);
  width: min(92vw, 420px);
  color: var(--color-text);
}
dialog::backdrop { background: rgba(15, 23, 42, 0.45); }
dialog h2 { margin: 0 0 var(--sp-2); font-size: var(--fs-lg); }
.dialog-close {
  position: absolute;
  right: var(--sp-3);
  top: var(--sp-3);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
}
.dialog-close:hover { background: var(--color-surface-sunken); }

.qr-dialog { text-align: center; display: grid; gap: var(--sp-2); }
.qr-dialog[open] { display: grid; }
.qr-dialog img { width: 220px; height: 220px; margin: 0 auto; border-radius: var(--radius-sm); }
.qr-dialog img:not([src]) { display: none; }
.qr-dialog p { margin: 0; color: var(--color-text-secondary); font-size: var(--fs-sm); }
#qr-loading { color: var(--color-text-secondary); font-size: var(--fs-sm); padding: var(--sp-6) 0; }

.history-dialog { width: min(94vw, 560px); }
.history-caption { margin: 0 0 var(--sp-3); color: var(--color-text-secondary); font-size: var(--fs-sm); }
.history-session-select { margin-bottom: var(--sp-3); }
.history-list {
  max-height: min(56vh, 480px);
  overflow-y: auto;
  display: grid;
  gap: var(--sp-2);
}
.history-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-sunken);
  padding: var(--sp-3);
  display: grid;
  gap: 2px;
  font-size: var(--fs-sm);
  overflow-wrap: anywhere;
}
.history-item .translated { font-weight: 600; }
.history-item .source { color: var(--color-text-secondary); font-size: var(--fs-xs); }
.history-item time { color: var(--color-text-secondary); font-size: var(--fs-xs); }
.history-item.fallback { border-color: var(--color-warning-border); background: var(--color-warning-soft); }
.history-empty { color: var(--color-text-secondary); text-align: center; padding: var(--sp-6) 0; }

.student-login-form { display: grid; gap: var(--sp-4); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--sp-6) + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(12px);
  max-width: min(92vw, 420px);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: var(--color-on-primary);
  font-size: var(--fs-sm);
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 60;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--color-danger); }

/* ============================================================
   접근성 / 모션
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}