/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --indigo:    #6366f1;
  --indigo-dk: #4f46e5;
  --indigo-lt: #e0e7ff;
  --green:     #10b981;
  --green-lt:  #d1fae5;
  --amber:     #f59e0b;
  --amber-lt:  #fef3c7;
  --red:       #ef4444;
  --red-lt:    #fee2e2;
  --gray:      #6b7280;
  --gray-lt:   #f3f4f6;
  --bg:        #f4f6ff;
  --card:      #ffffff;
  --text:      #1e293b;
  --text-lt:   #64748b;
  --r-sm:      10px;
  --r:         16px;
  --r-lg:      24px;
  --sh-sm:     0 2px 8px rgba(99,102,241,.08);
  --sh:        0 4px 20px rgba(99,102,241,.12);
  --sh-lg:     0 8px 40px rgba(99,102,241,.2);
}

body {
  font-family: 'Nunito', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page {
  flex: 1;
}

/* ── Navbar ──────────────────────────────────────────────────────────────── */
.navbar {
  background: var(--indigo);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 16px rgba(99,102,241,.35);
}
.navbar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 62px;
}
.navbar-brand {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.navbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}
.navbar .user-name {
  font-size: .88rem;
  font-weight: 700;
  opacity: .9;
}
.navbar .btn-nav {
  background: rgba(255,255,255,.18);
  border: none;
  color: #fff;
  border-radius: 8px;
  padding: 7px 14px;
  font-family: inherit;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s;
}
.navbar .btn-nav:hover { background: rgba(255,255,255,.28); }

/* ── Breadcrumb bar ──────────────────────────────────────────────────────── */
.breadcrumb-bar {
  background: rgba(0,0,0,.15);
  padding: 6px 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.breadcrumb-bar::-webkit-scrollbar { display: none; }
.bc-item {
  font-size: .8rem;
  font-weight: 700;
  white-space: nowrap;
  color: rgba(255,255,255,.7);
  cursor: pointer;
  transition: color .15s;
}
.bc-item:hover { color: #fff; }
.bc-item.current { color: #fff; cursor: default; }
.bc-sep {
  font-size: .75rem;
  color: rgba(255,255,255,.4);
}

/* ── Page layout ─────────────────────────────────────────────────────────── */
.page { max-width: 960px; width: 100%; margin: 0 auto; padding: 28px 16px 48px; }

/* ── Section header ──────────────────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}
.section-header h2 {
  font-size: 1.5rem;
  font-weight: 900;
  flex: 1;
}
.section-header p {
  color: var(--text-lt);
  font-size: .95rem;
  font-weight: 600;
  margin-top: 2px;
}

.select-intro {
  text-align: center;
  margin-bottom: 36px;
}
.select-intro h2 {
  font-size: 1.9rem;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 6px;
}
.select-intro p {
  color: var(--text-lt);
  font-size: 1rem;
  font-weight: 600;
}

/* ── Card ────────────────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border-radius: var(--r);
  padding: 28px;
  box-shadow: var(--sh);
}

/* ── Class cards ─────────────────────────────────────────────────────────── */
.class-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 18px;
}
.class-card {
  background: var(--card);
  border-radius: var(--r-lg);
  padding: 36px 24px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--sh);
  border: 3px solid transparent;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.class-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--sh-lg);
  border-color: var(--indigo);
}
.class-emoji {
  font-size: 3.8rem;
  display: block;
  margin-bottom: 14px;
}
.class-name {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--text);
}
.class-sub {
  font-size: .85rem;
  color: var(--text-lt);
  margin-top: 5px;
  font-weight: 600;
}

/* ── Volume cards ────────────────────────────────────────────────────────── */
.volume-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.volume-card {
  background: var(--card);
  border-radius: var(--r);
  padding: 30px 20px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--sh-sm);
  border: 3px solid transparent;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.volume-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh);
  border-color: var(--indigo);
}
.vol-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 12px;
}
.vol-name {
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--text);
}
.vol-count {
  font-size: .82rem;
  color: var(--text-lt);
  margin-top: 6px;
  font-weight: 600;
}

/* ── Chapter cards ───────────────────────────────────────────────────────── */
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}
.chapter-card {
  background: var(--card);
  border-radius: var(--r);
  padding: 18px 20px;
  cursor: pointer;
  box-shadow: var(--sh-sm);
  border: 2px solid #e8eaf6;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  display: flex;
  align-items: center;
  gap: 14px;
}
.chapter-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sh);
  border-color: var(--indigo);
}
.ch-num {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--indigo-lt);
  color: var(--indigo);
  font-size: 1.05rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.ch-info { flex: 1; min-width: 0; }
.ch-name {
  font-size: .95rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ch-sub {
  font-size: .8rem;
  color: var(--text-lt);
  margin-top: 3px;
  font-weight: 600;
}
.ch-arrow {
  color: var(--indigo);
  font-size: 1.3rem;
  opacity: .35;
  transition: opacity .15s;
}
.chapter-card:hover .ch-arrow { opacity: 1; }

/* ── Text cards ──────────────────────────────────────────────────────────── */
.text-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.text-card {
  background: var(--card);
  border-radius: var(--r);
  padding: 20px;
  cursor: pointer;
  box-shadow: var(--sh-sm);
  border: 2px solid #e8eaf6;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  position: relative;
}
.text-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sh);
  border-color: var(--indigo);
}
.tc-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.4;
  padding-right: 80px; /* space for badge + edit btn */
}

.tc-edit-btn {
  position: absolute;
  top: 12px;
  right: 46px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 4px 6px;
  border-radius: 6px;
  color: var(--text-lt);
  transition: background .15s, color .15s;
  line-height: 1;
}
.tc-edit-btn:hover { background: var(--indigo-lt); color: var(--indigo); }
.tc-meta {
  font-size: .8rem;
  color: var(--text-lt);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  font-weight: 600;
}
.tc-dot { opacity: .35; }
.tc-stars {
  font-size: 1.4rem;
  letter-spacing: 2px;
  display: block;
  margin-bottom: 4px;
}
.tc-stars.s3 { color: #f59e0b; }
.tc-stars.s2 { color: #fb923c; }
.tc-stars.s1 { color: #ef4444; }
.tc-stars.s0 { color: #d1d5db; }
.tc-best {
  font-size: .8rem;
  font-weight: 700;
  color: var(--text-lt);
}

.badge-new {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--amber);
  color: #fff;
  font-size: .7rem;
  font-weight: 900;
  padding: 3px 9px;
  border-radius: 20px;
  letter-spacing: .5px;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 10px;
  border: none;
  font-family: inherit;
  font-size: .95rem;
  font-weight: 800;
  cursor: pointer;
  transition: opacity .15s, transform .1s, box-shadow .15s;
}
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--indigo); color: #fff; box-shadow: 0 4px 14px rgba(99,102,241,.3); }
.btn-primary:hover:not(:disabled) { background: var(--indigo-dk); }
.btn-success { background: var(--green); color: #fff; }
.btn-danger  { background: var(--red);   color: #fff; }
.btn-ghost   { background: transparent; color: var(--indigo); border: 2px solid var(--indigo-lt); }
.btn-ghost:hover:not(:disabled) { background: var(--indigo-lt); }
.btn-sm   { padding: 7px 16px; font-size: .85rem; border-radius: 8px; }
.btn-lg   { padding: 14px 32px; font-size: 1.1rem; border-radius: 12px; }
.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  padding: 6px 8px;
  border-radius: 8px;
  line-height: 1;
  transition: background .15s;
  color: var(--indigo);
}
.btn-icon:hover { background: var(--indigo-lt); }

/* ── Forms ───────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-lt);
  font-size: .82rem;
  letter-spacing: .4px;
  text-transform: uppercase;
}
.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e8eaf6;
  border-radius: 10px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  transition: border-color .2s;
  background: var(--gray-lt);
}
.form-group input:focus {
  outline: none;
  border-color: var(--indigo);
  background: #fff;
}
.error-msg {
  color: var(--red);
  background: var(--red-lt);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: .9rem;
  font-weight: 700;
  margin-bottom: 14px;
}

/* ── Auth ────────────────────────────────────────────────────────────────── */
.auth-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  background: linear-gradient(135deg, #e0e7ff 0%, #f4f6ff 60%, #d1fae5 100%);
}
.auth-box {
  width: 100%;
  max-width: 420px;
}
.auth-logo {
  font-size: 3rem;
  text-align: center;
  margin-bottom: 8px;
}
.auth-title {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 4px;
  text-align: center;
}
.auth-subtitle {
  color: var(--text-lt);
  margin-bottom: 28px;
  font-size: .95rem;
  font-weight: 600;
  text-align: center;
}
.auth-toggle {
  text-align: center;
  margin-top: 20px;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-lt);
}
.auth-toggle a { color: var(--indigo); cursor: pointer; font-weight: 800; }

/* ── Exercise ────────────────────────────────────────────────────────────── */
.mode-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.mode-tab {
  padding: 9px 22px;
  border-radius: 30px;
  border: 2px solid #e8eaf6;
  background: var(--card);
  cursor: pointer;
  font-family: inherit;
  font-size: .9rem;
  font-weight: 800;
  color: var(--text-lt);
  transition: all .2s;
}
.mode-tab.active {
  background: var(--indigo);
  color: #fff;
  border-color: var(--indigo);
  box-shadow: 0 4px 14px rgba(99,102,241,.3);
}

.wpm-info {
  background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
  border-radius: var(--r-sm);
  padding: 14px 20px;
  margin-bottom: 20px;
  font-size: .95rem;
  color: var(--indigo-dk);
  font-weight: 800;
}

.reading-text-box {
  background: #fffdf5;
  border: 2px solid #fde68a;
  border-radius: var(--r);
  padding: 28px 32px;
  font-size: 1.3rem;
  line-height: 2.1;
  margin-bottom: 24px;
  min-height: 120px;
  letter-spacing: .3px;
  font-weight: 600;
}

/* ── Record button ───────────────────────────────────────────────────────── */
.record-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 32px 0;
}
.record-btn {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: none;
  background: var(--indigo);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 28px rgba(99,102,241,.45);
  transition: background .2s, transform .15s;
  font-size: 2.4rem;
}
.record-btn:hover:not(:disabled) { transform: scale(1.07); }
.record-btn.recording {
  background: var(--red);
  box-shadow: 0 6px 28px rgba(239,68,68,.5);
  animation: pulse-rec 1.2s infinite;
}
.record-btn:disabled { opacity: .4; cursor: not-allowed; transform: none; animation: none; }

@keyframes pulse-rec {
  0%, 100% { box-shadow: 0 6px 28px rgba(239,68,68,.5); }
  50%       { box-shadow: 0 8px 50px rgba(239,68,68,.75); transform: scale(1.05); }
}

.record-label {
  font-weight: 800;
  color: var(--text-lt);
  font-size: 1rem;
}
.record-label.rec { color: var(--red); }

.timer-display {
  font-size: 3rem;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  letter-spacing: -1px;
}
.timer-display.wpm-timer { color: var(--red); }

.processing-msg {
  text-align: center;
  color: var(--text-lt);
  padding: 36px;
  font-size: 1rem;
  font-weight: 700;
}
.spinner {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 4px solid #e8eaf6;
  border-top-color: var(--indigo);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin-bottom: 14px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Results ─────────────────────────────────────────────────────────────── */
.results-box { margin-top: 24px; }
.results-box h3 { font-size: 1.2rem; margin-bottom: 20px; font-weight: 900; }

.score-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}
.score-card {
  background: var(--gray-lt);
  border-radius: var(--r-sm);
  padding: 18px 14px;
  text-align: center;
}
.score-card .score-val {
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1.1;
}
.score-card .score-lbl {
  font-size: .7rem;
  color: var(--text-lt);
  margin-top: 4px;
  font-weight: 800;
  letter-spacing: .5px;
  text-transform: uppercase;
}
.score-card.overall { background: var(--indigo); }
.score-card.overall .score-val { color: #fff; }
.score-card.overall .score-lbl { color: rgba(255,255,255,.75); }
.score-card.good   { background: var(--green-lt); }
.score-card.good .score-val { color: var(--green); }
.score-card.medium { background: var(--amber-lt); }
.score-card.medium .score-val { color: var(--amber); }
.score-card.poor   { background: var(--red-lt); }
.score-card.poor .score-val { color: var(--red); }

.diff-section { margin-bottom: 20px; }
.diff-section h4 {
  font-size: .82rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--text-lt);
  text-transform: uppercase;
  letter-spacing: .5px;
}
.diff-text {
  font-size: 1.1rem;
  line-height: 2.1;
  background: #fafafa;
  border-radius: var(--r-sm);
  padding: 18px 20px;
  border: 1px solid #e8eaf6;
  font-weight: 600;
}
.diff-text .w-correct { color: var(--green); }
.diff-text .w-wrong   { color: var(--red); background: var(--red-lt); border-radius: 4px; padding: 1px 4px; }
.diff-text .w-missing { color: var(--amber); background: var(--amber-lt); border-radius: 4px; padding: 1px 4px; text-decoration: underline dashed; }

.transcribed-section h4 {
  font-size: .82rem;
  font-weight: 900;
  margin-bottom: 8px;
  color: var(--text-lt);
  text-transform: uppercase;
  letter-spacing: .5px;
}
.transcribed-text {
  font-size: .95rem;
  color: var(--text);
  background: var(--gray-lt);
  border-radius: var(--r-sm);
  padding: 14px 18px;
  line-height: 1.8;
  font-weight: 600;
}
.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

/* ── History ─────────────────────────────────────────────────────────────── */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}
.history-item {
  background: var(--card);
  border: 2px solid #e8eaf6;
  border-radius: var(--r);
  padding: 16px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: border-color .2s, box-shadow .2s;
}
.history-item:hover { border-color: var(--indigo); box-shadow: var(--sh-sm); }
.hi-score {
  font-size: 1.45rem;
  font-weight: 900;
  min-width: 72px;
  text-align: center;
  border-radius: 10px;
  padding: 8px 6px;
}
.hi-info { flex: 1; min-width: 0; }
.hi-title { font-weight: 800; font-size: .95rem; }
.hi-meta  { font-size: .82rem; color: var(--text-lt); margin-top: 3px; font-weight: 600; }
.hi-wpm   { font-size: .85rem; color: var(--indigo); font-weight: 900; }

.mode-badge {
  font-size: .7rem;
  font-weight: 900;
  padding: 4px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: .5px;
  flex-shrink: 0;
}
.mode-badge.normal { background: var(--indigo-lt); color: var(--indigo); }
.mode-badge.wpm    { background: var(--amber-lt);  color: var(--amber); }

/* ── Add text modal ──────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(30,41,59,.5);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-box { width: 100%; max-width: 540px; margin: 16px; }
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.modal-header h3 { font-size: 1.2rem; font-weight: 900; }
.modal-box textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e8eaf6;
  border-radius: 10px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  resize: vertical;
  background: var(--gray-lt);
  min-height: 160px;
}
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

/* ── Misc ────────────────────────────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid #e8eaf6; margin: 24px 0; }

.empty-state {
  text-align: center;
  color: var(--text-lt);
  padding: 56px 16px;
  font-size: 1rem;
  font-weight: 600;
}
.empty-icon { font-size: 3.5rem; display: block; margin-bottom: 14px; }
.empty-state strong {
  display: block;
  font-size: 1.2rem;
  font-weight: 900;
  margin-bottom: 6px;
  color: var(--text);
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 20px 16px;
  font-size: .8rem;
  color: var(--text-lt);
  font-weight: 600;
  border-top: 1px solid #e8eaf6;
  margin-top: 40px;
}
.site-footer a {
  color: var(--indigo);
  text-decoration: none;
}
.site-footer a:hover { text-decoration: underline; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .score-grid { grid-template-columns: repeat(2, 1fr); }
  .reading-text-box { font-size: 1.1rem; padding: 20px; }
  .class-grid  { grid-template-columns: 1fr 1fr; }
  .volume-grid { grid-template-columns: 1fr 1fr; }
  .chapter-grid, .text-grid { grid-template-columns: 1fr; }
  .navbar-brand { font-size: 1rem; }
  .navbar .user-name { display: none; }
}

/* ── Browser-only version (GitHub Pages) ───────────────────────────────── */
.profile-list { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.profile-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-radius: var(--r-sm);
  background: var(--indigo-lt); cursor: pointer; font-weight: 800;
  transition: transform .1s, box-shadow .1s;
}
.profile-item:hover { transform: translateY(-1px); box-shadow: var(--sh-sm); }
.profile-del {
  border: none; background: transparent; color: var(--gray);
  font-size: 1rem; cursor: pointer; padding: 2px 6px; border-radius: 6px;
}
.profile-del:hover { background: var(--red-lt); color: var(--red); }
.privacy-note { margin-top: 14px; font-size: .85rem; color: var(--text-lt); text-align: center; }
.live-heard { min-height: 1.4em; margin-top: 8px; color: var(--text-lt); font-style: italic; text-align: center; }
.record-btn:disabled { opacity: .45; cursor: not-allowed; }
.engine-switch { margin-top: 14px; display: flex; gap: 8px; align-items: center; justify-content: center; flex-wrap: wrap; font-size: .9rem; color: var(--text-lt); }
.engine-btn {
  border: 2px solid var(--indigo-lt); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 6px 14px; font: inherit; font-weight: 800; cursor: pointer;
}
.engine-btn.active { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.engine-btn:disabled { opacity: .45; cursor: not-allowed; }
.whisper-status { margin-top: 8px; min-height: 1.2em; font-size: .85rem; color: var(--text-lt); text-align: center; }