:root {
  color-scheme: light dark;
  --bg: #edf1f2;
  --surface: #f8faf9;
  --surface-strong: #ffffff;
  --surface-muted: #e6ecec;
  --text: #172122;
  --text-muted: #576467;
  --line: #cbd4d5;
  --line-strong: #aab7b9;
  --accent: #087f75;
  --accent-strong: #05655e;
  --accent-soft: #d9efec;
  --button-bg: #05655e;
  --button-text: #f4fbfa;
  --danger: #a33b32;
  --danger-soft: #fae6e3;
  --warning: #8a5a13;
  --warning-soft: #f6ead3;
  --shadow: 0 18px 50px rgb(40 66 68 / 0.1);
  --radius-panel: 16px;
  --radius-control: 10px;
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101718;
    --surface: #162021;
    --surface-strong: #1b2728;
    --surface-muted: #223031;
    --text: #e9efee;
    --text-muted: #aebbbb;
    --line: #344445;
    --line-strong: #506163;
    --accent: #51b8ad;
    --accent-strong: #72ccc2;
    --accent-soft: #173c39;
    --button-bg: #17655f;
    --button-text: #f4fbfa;
    --danger: #ef8b82;
    --danger-soft: #472523;
    --warning: #e2b66d;
    --warning-soft: #3b301d;
    --shadow: 0 18px 50px rgb(0 0 0 / 0.24);
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100dvh;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 0%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 30rem),
    var(--bg);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
audio:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 2px;
}

button:active {
  transform: translateY(1px);
}

.app-shell {
  width: min(1480px, calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0 48px;
}

.topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  min-height: 74px;
  padding: 0 4px 22px;
  border-bottom: 1px solid var(--line);
}

.kicker {
  margin: 0 0 4px;
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.practice-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.practice-picker select {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 6px 28px 6px 9px;
  font: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 3vw, 2.65rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(80px, 1fr));
  gap: 8px;
}

.summary div {
  min-width: 88px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.summary strong,
.summary span {
  display: block;
}

.summary strong {
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
}

.summary span {
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.workspace {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  gap: 22px;
  padding-top: 22px;
}

.review-rail,
.review-panel {
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow);
}

.review-rail {
  position: sticky;
  top: 18px;
  align-self: start;
  max-height: calc(100dvh - 36px);
  overflow: auto;
  padding: 18px;
}

.filter-section h2 {
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.segmented.compact {
  grid-template-columns: repeat(4, 1fr);
  margin-top: 8px;
}

.segmented button,
.status-choice button,
.time-input-row button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface-strong);
  cursor: pointer;
  transition: border-color 140ms ease, background-color 140ms ease, color 140ms ease;
}

.segmented button {
  padding: 8px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 650;
  white-space: nowrap;
}

.segmented button[aria-pressed="true"],
.status-choice button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.question-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
  margin: 20px 0;
}

.question-nav button {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  color: var(--text-muted);
  background: var(--surface-strong);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.question-nav button:hover {
  border-color: var(--line-strong);
}

.question-nav button[aria-current="true"] {
  border-color: var(--accent);
  color: var(--surface-strong);
  background: var(--accent);
}

.question-nav button[data-status="confirmed"]:not([aria-current="true"]) {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.question-nav button[data-low="true"]:not([aria-current="true"]) {
  border-color: color-mix(in srgb, var(--warning) 55%, var(--line));
  color: var(--warning);
  background: var(--warning-soft);
}

.button,
.icon-button {
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
}

.button:disabled,
.icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.button.primary,
.button.save {
  color: var(--button-text);
  background: var(--button-bg);
}

.button.secondary,
.icon-button {
  border-color: var(--line);
  color: var(--text);
  background: var(--surface-strong);
}

.button.save {
  min-width: 140px;
}

.full-width {
  width: 100%;
}

.review-panel {
  min-width: 0;
  padding: clamp(22px, 4vw, 46px);
}

.question-heading,
.section-heading-row,
.review-actions,
.playback-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.question-heading {
  align-items: start;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.question-heading h2 {
  margin: 7px 0 0;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  letter-spacing: -0.035em;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.question-meta span,
.dirty-label {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 750;
}

#priority-label[data-priority="0"] {
  color: var(--danger);
  background: var(--danger-soft);
}

#priority-label[data-priority="1"] {
  color: var(--warning);
  background: var(--warning-soft);
}

#priority-label[data-priority="normal"] {
  color: var(--text-muted);
  background: var(--surface-muted);
}

.priority-summary {
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.priority-queue {
  width: 100%;
  min-height: 42px;
  margin-bottom: 10px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  color: var(--text);
  background: var(--surface-strong);
}

#part-label {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

#confidence-label {
  color: var(--text-muted);
  background: var(--surface-muted);
}

#confidence-label.low {
  color: var(--warning);
  background: var(--warning-soft);
}

#status-label[data-status="confirmed"] {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

#status-label[data-status="needs_review"] {
  color: var(--warning);
  background: var(--warning-soft);
}

.question-stepper {
  display: flex;
  gap: 8px;
}

.icon-button {
  min-height: 38px;
  padding: 8px 12px;
  font-size: 0.78rem;
}

.content-section,
.calibration-section {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.content-section h3,
.calibration-section h3 {
  margin-bottom: 14px;
  font-size: 1rem;
}

.question-prompt,
blockquote {
  max-width: 76ch;
  margin-bottom: 20px;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.62;
}

blockquote {
  margin-left: 0;
  padding-left: 18px;
  border-left: 3px solid var(--accent);
  color: var(--text);
}

.question-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 18px;
  max-width: 900px;
  margin-bottom: 22px;
}

.option-row {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 8px;
  padding: 9px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.option-row strong {
  color: var(--text);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
}

.option-row.correct {
  color: var(--accent-strong);
}

.answer-grid {
  display: grid;
  grid-template-columns: minmax(180px, 0.35fr) minmax(0, 1fr);
  gap: 12px;
  margin: 0;
}

.answer-grid div {
  padding: 16px;
  border-radius: var(--radius-control);
  background: var(--surface-muted);
}

.answer-grid dt {
  margin-bottom: 7px;
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 700;
}

.answer-grid dd {
  margin: 0;
  line-height: 1.55;
}

#correct-answer {
  color: var(--accent-strong);
  font-weight: 800;
}

.key-phrases {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.key-phrases span {
  padding: 6px 9px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  border-radius: 999px;
  color: var(--accent-strong);
  background: var(--accent-soft);
  font-size: 0.78rem;
  font-weight: 650;
}

.analysis-zh {
  margin: 16px 0 0;
  color: var(--text-muted);
  line-height: 1.65;
}

.calibration-section {
  padding-bottom: 0;
  border-bottom: 0;
}

.section-heading-row {
  align-items: start;
}

.section-heading-row h3 {
  margin-bottom: 5px;
}

.section-heading-row p {
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.dirty-label {
  color: var(--danger);
  background: var(--danger-soft);
}

audio {
  width: 100%;
  margin: 20px 0 14px;
}

.clip-range-editor {
  margin: 4px 0 20px;
  padding: 14px 16px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface-muted);
}

.clip-range-labels {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.84rem;
}

.clip-range-labels span,
.clip-range-editor p {
  color: var(--text-muted);
}

.clip-range-editor p {
  margin: 9px 0 0;
  font-size: 0.78rem;
}

.clip-range-track {
  --clip-start: 0%;
  --clip-end: 100%;
  position: relative;
  height: 24px;
  background: linear-gradient(to right,
    var(--line) 0 var(--clip-start),
    var(--accent) var(--clip-start) var(--clip-end),
    var(--line) var(--clip-end) 100%);
  background-position: center;
  background-repeat: no-repeat;
  background-size: 100% 6px;
}

.clip-range-track input[type="range"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 24px;
  margin: 0;
  appearance: none;
  background: transparent;
  pointer-events: none;
}

.clip-range-track input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: transparent;
}

.clip-range-track input[type="range"]::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  margin-top: -8px;
  border: 3px solid var(--surface-strong);
  border-radius: 50%;
  appearance: none;
  background: var(--accent);
  box-shadow: 0 1px 5px rgb(0 0 0 / 20%);
  cursor: grab;
  pointer-events: auto;
}

.clip-range-track input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
}

.playback-row {
  justify-content: flex-start;
  flex-wrap: wrap;
}

.toggle-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 5px;
  color: var(--text-muted);
  font-size: 0.86rem;
  font-weight: 650;
}

.toggle-control input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

#playback-time {
  margin-left: auto;
  color: var(--text-muted);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.time-editor {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 20px;
}

.time-editor fieldset {
  min-width: 0;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
}

.time-editor legend {
  padding: 0 5px;
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.time-input-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 8px;
}

.time-input-row button {
  min-width: 58px;
  color: var(--text-muted);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
}

.time-input-row input {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  color: var(--text);
  background: var(--surface-strong);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-variant-numeric: tabular-nums;
}

.boundary-actions {
  display: flex;
  gap: 14px;
  margin-top: 12px;
}

.text-button {
  min-height: 36px;
  padding: 6px 0;
  border: 0;
  color: var(--accent-strong);
  background: transparent;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.review-actions {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.status-choice {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.status-choice button {
  padding: 9px 14px;
  font-size: 0.84rem;
  font-weight: 700;
}

.save-message {
  min-height: 24px;
  margin: 10px 0 0;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.save-message.error {
  color: var(--danger);
}

.loading-view,
.message-view {
  width: min(720px, 100%);
  margin: 80px auto;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.loading-view p,
.message-view p {
  color: var(--text-muted);
}

.skeleton {
  width: 56%;
  height: 18px;
  margin-bottom: 14px;
  border-radius: 6px;
  background: var(--surface-muted);
  animation: pulse 1.2s ease-in-out infinite alternate;
}

.skeleton-wide {
  width: 88%;
}

.skeleton-tall {
  width: 100%;
  height: 110px;
}

@keyframes pulse {
  from { opacity: 0.5; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 920px) {
  .app-shell {
    width: min(100% - 24px, 760px);
    padding-top: 18px;
  }

  .topbar {
    align-items: start;
    flex-direction: column;
    gap: 18px;
  }

  .summary {
    width: 100%;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .review-rail {
    position: static;
    max-height: none;
  }

  .question-nav {
    grid-template-columns: repeat(10, 1fr);
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: calc(100% - 16px);
  }

  .summary div {
    min-width: 0;
    padding-left: 10px;
  }

  .review-rail,
  .review-panel {
    border-radius: 12px;
  }

  .review-panel {
    padding: 20px 16px;
  }

  .question-nav {
    grid-template-columns: repeat(6, 1fr);
  }

  .question-heading,
  .review-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .question-stepper {
    align-self: stretch;
  }

  .question-stepper button {
    flex: 1;
  }

  .question-options,
  .answer-grid,
  .time-editor {
    grid-template-columns: 1fr;
  }

  #playback-time {
    width: 100%;
    margin-left: 0;
  }

  .status-choice {
    width: 100%;
  }

  .button.save {
    width: 100%;
  }
}