/* AI 雅思老师 — product UI (preserve YYSD cream/navy) */

.ai-tutor-page {
  --ai-ink: #102a4c;
  --ai-muted: #5a6b7d;
  --ai-line: rgba(16, 42, 76, 0.12);
  --ai-surface: #fff;
  --ai-soft: rgba(16, 42, 76, 0.04);
  --ai-accent: #1e8449;
  --ai-gold: #c7a45d;
}

/* Critical: author display must not beat [hidden] */
.ai-view[hidden],
.ai-exam[hidden],
.ai-review[hidden],
.ai-admin[hidden],
.ai-picker[hidden],
.ai-practice-bar[hidden],
#page-back[hidden] {
  display: none !important;
}

.ai-tutor {
  display: block;
  max-width: 920px;
  padding-bottom: 48px;
}

.ai-page-title-row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.ai-page-title-row h1 { margin: 0; }
.ai-page-title-row .minimal-page-desc { margin: 8px 0 0; max-width: 36rem; }
.ai-page-back {
  flex: 0 0 auto;
  margin-top: 0.55em;
  border: 0;
  background: transparent;
  color: var(--ai-muted);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  padding: 4px 0;
}
.ai-page-back:hover { color: var(--ai-ink); }

.ai-quota-line {
  margin: 18px 0 0;
  font-size: 0.82rem;
  color: var(--ai-muted);
  font-variant-numeric: tabular-nums;
}
.ai-quota-line b { color: var(--ai-ink); font-weight: 600; }

/* Hub paths */
.ai-path-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.ai-path {
  text-align: left;
  border: 1px solid var(--ai-line);
  background: var(--ai-surface);
  border-radius: 16px;
  padding: 22px 20px 18px;
  cursor: pointer;
  font: inherit;
  color: inherit;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 8px 24px rgba(16, 42, 76, 0.04);
}
.ai-path:hover {
  border-color: rgba(16, 42, 76, 0.28);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(16, 42, 76, 0.08);
}
.ai-path:active { transform: translateY(0); }
.ai-path__kicker {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ai-gold);
  font-weight: 600;
}
.ai-path strong {
  font-family: var(--font-serif, "Playfair Display", Georgia, serif);
  font-size: 1.75rem;
  color: var(--ai-ink);
  font-weight: 700;
}
.ai-path__desc {
  color: var(--ai-muted);
  font-size: 0.92rem;
  line-height: 1.45;
  flex: 1;
}
.ai-path__cta {
  margin-top: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ai-ink);
}

/* Speaking mode list */
.ai-mode-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ai-mode {
  position: relative;
  text-align: left;
  border: 1px solid var(--ai-line);
  background: var(--ai-surface);
  border-radius: 14px;
  padding: 16px 18px;
  cursor: pointer;
  font: inherit;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.2s, background 0.2s;
}
.ai-mode:hover {
  border-color: rgba(16, 42, 76, 0.3);
  background: #fcfcfd;
}
.ai-mode:first-child {
  border-color: rgba(30, 132, 73, 0.35);
  background: linear-gradient(180deg, #f4fbf7, #fff);
}
.ai-mode strong {
  font-size: 1.05rem;
  color: var(--ai-ink);
}
.ai-mode > span:last-child {
  font-size: 0.86rem;
  color: var(--ai-muted);
  line-height: 1.4;
}
.ai-mode__badge {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  background: var(--ai-accent);
  padding: 3px 8px;
  border-radius: 999px;
}

.ai-admin {
  margin-top: 20px;
  border-top: 1px solid var(--ai-line);
  padding-top: 12px;
  font-size: 0.84rem;
  color: var(--ai-muted);
}
.ai-admin summary {
  cursor: pointer;
  user-select: none;
}
.ai-admin__body {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.ai-admin__hint { margin: 0; width: 100%; }

/* Speak room */
.ai-room {
  display: grid;
  grid-template-columns: minmax(160px, 200px) 1fr;
  gap: 14px;
  min-height: 58vh;
  align-items: stretch;
}
.ai-room__side {
  background: var(--ai-surface);
  border: 1px solid var(--ai-line);
  border-radius: 14px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  max-height: 68vh;
}
.ai-room__side-head {
  font-size: 0.82rem;
  color: var(--ai-muted);
  margin-bottom: 8px;
}
.ai-room__sessions {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow: auto;
  flex: 1;
}
.ai-room__sessions li button {
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 9px 8px;
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
.ai-room__sessions li button:hover,
.ai-room__sessions li button.is-active {
  background: var(--ai-soft);
}
.ai-room__sessions .meta {
  display: block;
  font-size: 0.72rem;
  color: var(--ai-muted);
  margin-top: 2px;
}

.ai-room__main {
  display: flex;
  flex-direction: column;
  min-height: 58vh;
  border: 1px solid var(--ai-line);
  border-radius: 14px;
  background: var(--ai-surface);
  overflow: hidden;
}
.ai-room__bar {
  padding: 12px 16px;
  border-bottom: 1px solid var(--ai-line);
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.ai-room__label {
  font-weight: 700;
  color: var(--ai-ink);
}
.ai-room__hint-inline {
  font-size: 0.82rem;
  color: var(--ai-muted);
  min-height: 1.2em;
}
.ai-room__hint-inline.is-error { color: #b42318; }
.ai-room__hint-inline.is-rec { color: var(--ai-accent); font-weight: 600; }

.ai-picker {
  padding: 14px 16px;
  border-bottom: 1px solid var(--ai-line);
  background: var(--ai-soft);
}
.ai-picker__title {
  font-size: 0.84rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--ai-ink);
}
.ai-picker__cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 12px;
}
.ai-picker h3 {
  margin: 0 0 8px;
  font-size: 0.8rem;
  color: var(--ai-muted);
  font-weight: 600;
}
.ai-picker__list {
  max-height: 180px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ai-picker__list label {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  font-size: 0.84rem;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
}
.ai-picker__list label:hover { background: rgba(255, 255, 255, 0.7); }

.ai-room__messages {
  flex: 1;
  overflow: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: linear-gradient(180deg, #fafbfc, #fff 40%);
  min-height: 220px;
}
.ai-tutor__empty {
  margin: auto;
  text-align: center;
  color: var(--ai-muted);
  font-size: 0.92rem;
  max-width: 22rem;
  line-height: 1.5;
}
.ai-msg {
  max-width: 85%;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.5;
  white-space: pre-wrap;
}
.ai-msg--assistant {
  align-self: flex-start;
  background: #eef3f8;
  color: var(--ai-ink);
}
.ai-msg--user {
  align-self: flex-end;
  background: var(--ai-ink);
  color: #fff;
}
.ai-msg__actions { margin-top: 6px; }
.ai-pack {
  align-self: stretch;
  border: 1px dashed rgba(16, 42, 76, 0.22);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.82rem;
  background: #fff;
}
.ai-pack b { display: block; margin-bottom: 4px; }
.ai-score {
  align-self: stretch;
  border: 1px solid var(--ai-line);
  border-radius: 12px;
  padding: 14px;
  background: #fff;
}
.ai-score h3 { margin: 0 0 8px; font-size: 1rem; }
.ai-score dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  margin: 0;
  font-size: 0.88rem;
}
.ai-score dt { color: var(--ai-muted); }
.ai-score dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }

.ai-room__composer {
  border-top: 1px solid var(--ai-line);
  padding: 12px 14px 14px;
  background: #fff;
}
.ai-practice-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.ai-room__input-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  align-items: end;
}
.ai-room__input-row.is-mic-only {
  grid-template-columns: 1fr;
}
.ai-room__input-row textarea {
  width: 100%;
  resize: vertical;
  min-height: 44px;
  border: 1px solid var(--ai-line);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}
.ai-room__input-row textarea:focus {
  outline: none;
  border-color: rgba(16, 42, 76, 0.35);
  box-shadow: 0 0 0 3px rgba(16, 42, 76, 0.08);
}
.ai-mic {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 88px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--ai-line);
  background: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ai-ink);
}
.ai-mic:disabled,
.ai-room__input-row .btn--primary:disabled,
.ai-write__meta .btn--primary:disabled,
.ai-side__list button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.ai-mic__icon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ai-muted);
}
.ai-mic.is-on {
  border-color: rgba(180, 35, 24, 0.45);
  background: #fff5f4;
  color: #b42318;
}
.ai-mic.is-on .ai-mic__icon {
  background: #b42318;
  box-shadow: 0 0 0 4px rgba(180, 35, 24, 0.18);
  animation: ai-mic-pulse 1s ease-in-out infinite;
}
.ai-mic.is-on .ai-mic__label::after { content: "中…"; }
@keyframes ai-mic-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

/* Writing */
.ai-write {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 760px;
}
.ai-write__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--ai-muted);
}
.ai-write__steps li {
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--ai-soft);
}
.ai-write__steps li.is-on {
  background: var(--ai-ink);
  color: #fff;
  font-weight: 600;
}
.ai-write__select {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.ai-write__select label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--ai-muted);
  font-weight: 600;
}
.ai-write__grow { flex: 1; min-width: 220px; }
.ai-write__select select,
.ai-write textarea {
  font: inherit;
  border: 1px solid var(--ai-line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
  color: var(--ai-ink);
}
.ai-write textarea {
  width: 100%;
  min-height: 280px;
  line-height: 1.65;
  resize: vertical;
}
.ai-write textarea:focus,
.ai-write__select select:focus {
  outline: none;
  border-color: rgba(16, 42, 76, 0.35);
  box-shadow: 0 0 0 3px rgba(16, 42, 76, 0.08);
}
.ai-write__prompt {
  margin: 0;
  white-space: pre-wrap;
  background: var(--ai-soft);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--ai-ink);
  max-height: 160px;
  overflow: auto;
}
.ai-write__essay-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ai-muted);
}
.ai-write__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.ai-write__meta #w-wordcount {
  font-size: 0.82rem;
  color: var(--ai-muted);
  font-variant-numeric: tabular-nums;
  margin-right: auto;
}
.ai-write__hint {
  margin: 0;
  font-size: 0.84rem;
  color: var(--ai-muted);
}
.ai-write__hint.is-error { color: #b42318; }
.ai-write__result {
  margin-top: 8px;
  padding-top: 8px;
}
.ai-write__result h3 { margin: 16px 0 8px; font-size: 0.95rem; }
.ai-write__result ul { margin: 0; padding-left: 1.2em; font-size: 0.88rem; line-height: 1.5; }
.ai-write__model {
  white-space: pre-wrap;
  background: var(--ai-soft);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.86rem;
  line-height: 1.55;
}
.ai-score {
  border: 1px solid var(--ai-line);
  border-radius: 12px;
  padding: 14px;
  background: #fff;
}

/* Exam overlay */
.ai-exam {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: #0f1a24;
  color: #e8eef4;
  display: flex;
  flex-direction: column;
  padding: 18px 22px 22px;
}
.ai-exam__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.ai-exam__brand {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.7;
}
.ai-exam__phase {
  font-family: var(--font-serif, "Playfair Display", Georgia, serif);
  font-size: 1.6rem;
  margin-top: 4px;
}
.ai-exam__timers {
  display: flex;
  gap: 18px;
  font-variant-numeric: tabular-nums;
}
.ai-exam__timers span {
  display: block;
  font-size: 0.72rem;
  opacity: 0.65;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.ai-exam__timers strong { font-size: 1.35rem; }
.ai-exam__stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 18px;
  padding: 24px 12px;
}
.ai-exam__cue {
  max-width: 560px;
  text-align: left;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  padding: 16px 18px;
  font-size: 0.95rem;
  line-height: 1.5;
}
.ai-exam__status {
  margin: 0;
  font-size: 1.15rem;
  max-width: 40rem;
  line-height: 1.5;
}
.ai-exam__viz {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.2);
  transition: box-shadow 0.2s, border-color 0.2s;
}
.ai-exam__viz.is-listening {
  border-color: #3dd68c;
  box-shadow: 0 0 0 10px rgba(61, 214, 140, 0.15);
  animation: ai-exam-pulse 1.4s ease-in-out infinite;
}
.ai-exam__viz.is-speaking {
  border-color: #6eb6ff;
  box-shadow: 0 0 0 10px rgba(110, 182, 255, 0.12);
}
@keyframes ai-exam-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}
.ai-exam__bottom {
  display: flex;
  justify-content: center;
  gap: 12px;
}

/* Review */
.ai-review {
  position: fixed;
  inset: 0;
  z-index: 1210;
  background: rgba(8, 14, 22, 0.72);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow: auto;
  padding: 32px 16px;
}
.ai-review__panel {
  width: min(720px, 100%);
  background: #fff;
  color: #1e2a3a;
  border-radius: 16px;
  padding: 22px 22px 28px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}
.ai-review__panel h2 { margin: 0 0 12px; }
.ai-review__turn {
  border-top: 1px solid rgba(16, 42, 76, 0.1);
  padding: 12px 0;
  font-size: 0.9rem;
}
.ai-review__turn audio {
  display: block;
  width: 100%;
  margin-top: 8px;
}
.ai-review__turn.is-invalid { opacity: 0.75; }
.ai-review__closing { color: var(--ai-muted); }

@media (max-width: 860px) {
  .ai-path-grid { grid-template-columns: 1fr; }
  .ai-room { grid-template-columns: 1fr; }
  .ai-room__side { max-height: 140px; }
  .ai-picker__cols { grid-template-columns: 1fr; }
  .ai-room__input-row:not(.is-mic-only) {
    grid-template-columns: 1fr;
  }
}