:root {
  color-scheme: light;
  --ink: #16201e;
  --muted: #66736f;
  --line: #d9e1de;
  --paper: #f8faf8;
  --panel: #ffffff;
  --accent: #176b5d;
  --accent-strong: #0f4f45;
  --accent-soft: #dff2ed;
  --warn: #b64b35;
  --focus: #2257b8;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(120deg, rgba(23, 107, 93, 0.11), transparent 38%),
    linear-gradient(240deg, rgba(34, 87, 184, 0.1), transparent 34%),
    var(--paper);
  color: var(--ink);
}

button,
textarea,
select,
input {
  font: inherit;
}

button,
.file-button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    background 140ms ease;
}

button:hover,
.file-button:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
}

.primary-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.primary-btn:hover {
  background: var(--accent-strong);
}

.record-btn {
  border-color: rgba(182, 75, 53, 0.35);
  color: var(--warn);
}

.record-btn.is-recording {
  background: var(--warn);
  color: #fff;
  border-color: var(--warn);
}

.app-shell {
  width: min(1220px, calc(100vw - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 28px 0;
  display: flex;
  align-items: center;
}

.app-frame {
  width: 100%;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.screen-tabs {
  display: inline-flex;
  gap: 6px;
  padding: 5px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.tab-btn {
  border-color: transparent;
  min-height: 38px;
}

.tab-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.screen {
  display: none;
}

.screen.is-active {
  display: block;
}

.workspace {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(320px, 0.86fr) minmax(380px, 1.14fr);
  gap: 18px;
}

.pronunciation-workspace {
  grid-template-columns: minmax(0, 1fr);
}

.pronunciation-workspace textarea {
  min-height: 190px;
}

.panel {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(217, 225, 222, 0.9);
  border-radius: 8px;
  box-shadow: 0 20px 55px rgba(22, 32, 30, 0.08);
}

.input-panel,
.practice-panel {
  padding: 22px;
}

.brand-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 7px;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 0.78rem;
}

.section-title {
  margin-bottom: 18px;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(1.55rem, 2.4vw, 2.35rem);
  line-height: 1.08;
  max-width: 520px;
}

h2 {
  font-size: 1.18rem;
  margin-bottom: 10px;
}

.status-pill {
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 7px 10px;
  font-size: 0.78rem;
  color: var(--accent-strong);
  background: var(--accent-soft);
  white-space: nowrap;
}

.field-label,
.control-grid label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
}

textarea {
  width: 100%;
  min-height: 330px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 15px;
  line-height: 1.55;
  color: var(--ink);
  background: #fff;
  outline: none;
}

textarea:focus,
select:focus,
input:focus-visible,
button:focus-visible,
.file-button:focus-visible {
  border-color: var(--focus);
  outline: 3px solid rgba(34, 87, 184, 0.15);
}

.phrase-chunks {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.phrase-chunks-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.chunk-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.chunk-toggle input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.chunk-list {
  display: grid;
  gap: 8px;
  max-height: 180px;
  overflow: auto;
}

.chunk-button {
  width: 100%;
  min-height: 40px;
  justify-content: flex-start;
  padding: 9px 11px;
  text-align: left;
  line-height: 1.35;
  color: var(--ink);
  background: #fff;
}

.chunk-button.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.file-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 14px 0;
  flex-wrap: wrap;
}

#fileInput,
#readerFileInput {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.muted {
  color: var(--muted);
  font-size: 0.88rem;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.metrics-grid div,
.score-card,
.feedback-card,
.transcript-panel,
.current-reading-panel,
.word-analysis-panel,
.audio-analysis-panel,
.phoneme-panel,
.drill-panel,
.speech-metrics-grid article,
.audio-metrics-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.metrics-grid div {
  padding: 13px;
}

.compact-metrics {
  max-width: 520px;
  margin: -6px 0 16px;
}

.metrics-grid.compact-metrics div {
  padding: 8px 10px;
}

.metrics-grid.compact-metrics span {
  font-size: 1rem;
  line-height: 1.05;
}

.metrics-grid.compact-metrics small {
  font-size: 0.72rem;
}

.metrics-grid span {
  display: block;
  font-size: 1.45rem;
  font-weight: 800;
}

.metrics-grid small {
  color: var(--muted);
}

.toolbar,
.recorder-strip {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.control-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 14px;
  margin: 18px 0;
}

.input-panel .control-grid + .field-label {
  margin-top: 4px;
}

select,
input[type="range"] {
  width: 100%;
}

select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 0 10px;
}

input[type="range"] {
  accent-color: var(--accent);
}

.recorder-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}

#recordingTimer {
  margin-left: auto;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.practice-subtabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}

.practice-subtab {
  min-height: 36px;
  padding: 8px 12px;
  border-color: transparent;
}

.practice-subtab.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

[data-practice-panel] {
  display: none !important;
}

[data-practice-panel].is-active {
  display: block !important;
}

.analysis-layout[data-practice-panel].is-active,
.speech-metrics-grid[data-practice-panel].is-active,
.waveform-panel[data-practice-panel].is-active {
  display: grid !important;
}

.analysis-layout {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 14px;
  margin: 18px 0;
}

.score-card,
.feedback-card,
.transcript-panel,
.current-reading-panel,
.word-analysis-panel,
.audio-analysis-panel,
.phoneme-panel,
.drill-panel {
  padding: 16px;
}

.score-label {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 8px;
}

#practiceScore {
  display: block;
  font-size: clamp(2.5rem, 7vw, 4.4rem);
  line-height: 0.95;
  color: var(--accent-strong);
  margin-bottom: 12px;
}

.score-card p,
.feedback-card li,
.transcript {
  color: var(--muted);
  line-height: 1.5;
}

.feedback-card ul {
  margin: 0;
  padding-left: 20px;
}

.feedback-card li + li {
  margin-top: 7px;
}

.transcript-panel {
  min-height: 130px;
}

.transcript {
  margin-bottom: 0;
}

.speech-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0;
}

.speech-metrics-grid article {
  padding: 13px;
}

.speech-metrics-grid span {
  display: block;
  font-size: 1.32rem;
  font-weight: 850;
  color: var(--accent-strong);
}

.speech-metrics-grid small {
  color: var(--muted);
}

.word-analysis-panel,
.audio-analysis-panel,
.phoneme-panel,
.drill-panel {
  margin-top: 18px;
}

.rebuilt-phrase-panel {
  display: grid;
  gap: 8px;
  margin: 12px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.rebuilt-phrase-panel audio {
  width: 100%;
}

.waveform-panel {
  display: grid;
  gap: 10px;
  margin: 14px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.waveform-canvas {
  width: 100%;
  height: 190px;
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7faf8;
  cursor: crosshair;
}

.waveform-controls {
  display: grid;
  grid-template-columns: minmax(160px, 0.5fr) minmax(280px, 1fr);
  gap: 10px;
  align-items: center;
}

.waveform-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.waveform-actions button {
  min-height: 36px;
  padding: 8px 10px;
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-header-row h2 {
  margin-bottom: 0;
}

.word-analysis-list {
  display: grid;
  gap: 8px;
  max-height: 340px;
  overflow: auto;
  padding-right: 4px;
}

.word-card {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) repeat(4, 56px);
  gap: 8px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
  cursor: pointer;
}

.word-card.needs-drill {
  border-color: rgba(182, 75, 53, 0.4);
  background: #fff9f6;
}

.word-card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(28, 117, 101, 0.12);
}

.word-card strong,
.word-card small,
.word-card span {
  display: block;
}

.word-card small {
  color: var(--muted);
  font-size: 0.76rem;
}

.word-card > span {
  text-align: center;
  border-radius: 8px;
  padding: 6px 4px;
  font-weight: 850;
  background: var(--accent-soft);
}

.word-card > span.is-good {
  color: var(--accent-strong);
}

.word-card > span.is-mid {
  color: #7b6116;
  background: #fff2c2;
}

.word-card > span.is-low {
  color: var(--warn);
  background: #fde4dc;
}

.phoneme-issue-list {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 6px;
}

.phoneme-issue {
  width: fit-content;
  border-radius: 999px;
  padding: 4px 7px;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--warn);
  background: #fde4dc;
}

.phoneme-issue-detail {
  flex-basis: 100%;
  color: var(--muted);
  line-height: 1.35;
}

.phrase-stress-badge {
  width: fit-content;
  margin-top: 6px;
  border-radius: 999px;
  padding: 4px 7px;
  font-size: 0.72rem;
  font-weight: 850;
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.minimal-pair-exercise {
  display: grid;
  gap: 6px;
  margin-top: 8px;
  padding: 8px;
  border: 1px solid rgba(28, 117, 101, 0.2);
  border-radius: 8px;
  background: rgba(234, 246, 241, 0.72);
}

.minimal-pair-exercise strong {
  font-size: 0.82rem;
}

.minimal-pair-exercise small {
  line-height: 1.35;
}

.minimal-pair-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.minimal-pair-actions button {
  min-height: 30px;
  padding: 5px 8px;
  font-size: 0.78rem;
}

.drill-word-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  max-height: 520px;
  overflow-y: auto;
  padding-right: 4px;
}

.drill-card {
  display: grid;
  grid-template-columns: minmax(130px, 0.9fr) 64px minmax(260px, 1.5fr);
  gap: 10px;
  align-items: center;
  padding: 12px;
  border: 1px solid rgba(182, 75, 53, 0.28);
  border-radius: 8px;
  background: #fffaf8;
}

.drill-card.is-clear {
  border-color: var(--line);
  background: #fbfdfc;
}

.drill-card.needs-drill {
  border-color: rgba(182, 75, 53, 0.38);
  background: #fff7f3;
}

.audio-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.audio-metrics-grid article {
  padding: 11px;
}

.audio-metrics-grid span {
  display: block;
  color: var(--accent-strong);
  font-size: 1.1rem;
  font-weight: 850;
}

.audio-metrics-grid small {
  color: var(--muted);
}

.audio-analysis-tips {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.45;
}

.phoneme-analysis-list {
  display: grid;
  gap: 10px;
}

.phoneme-card {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.phoneme-card strong,
.phoneme-card small {
  display: block;
}

.phoneme-card small {
  color: var(--muted);
}

.phoneme-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.phoneme-chip-list span {
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 5px 8px;
  font-size: 0.82rem;
  font-weight: 750;
}

.drill-card-main {
  display: grid;
  gap: 3px;
}

.drill-card-main strong {
  font-size: 1.05rem;
}

.drill-status-badge {
  width: fit-content;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.drill-status-badge.needs-drill {
  color: var(--warn);
  background: #fde4dc;
}

.phonetic-hint,
.retry-result {
  color: var(--muted);
  font-size: 0.82rem;
}

.drill-score {
  display: grid;
  place-items: center;
  min-height: 46px;
  border-radius: 8px;
  font-weight: 900;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.drill-score.is-mid {
  color: #7b6116;
  background: #fff2c2;
}

.drill-score.is-low {
  color: var(--warn);
  background: #fde4dc;
}

.drill-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.drill-actions button {
  min-height: 34px;
  padding: 0 10px;
}

.retry-result {
  grid-column: 1 / -1;
  margin: 0;
}

.current-reading-panel {
  min-height: 260px;
  display: grid;
  align-content: start;
  gap: 10px;
}

.current-reading-text {
  margin: 0;
  font-size: clamp(1.25rem, 2.3vw, 2rem);
  line-height: 1.45;
  color: var(--ink);
}

.current-word {
  color: var(--accent-strong);
  background: var(--accent-soft);
  border-radius: 4px;
  text-decoration: underline;
  text-decoration-thickness: 0.14em;
  text-underline-offset: 0.18em;
}

@media (max-width: 880px) {
  .app-shell {
    width: min(100% - 20px, 680px);
    padding: 10px 0;
    align-items: flex-start;
  }

  .workspace,
  .control-grid,
  .analysis-layout,
  .speech-metrics-grid,
  .audio-metrics-grid {
    grid-template-columns: 1fr;
  }

  .word-card {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .word-card > div {
    grid-column: 1 / -1;
  }

  .waveform-controls {
    grid-template-columns: 1fr;
  }

  .waveform-actions {
    justify-content: flex-start;
  }

  .drill-card {
    grid-template-columns: 1fr;
  }

  .app-header,
  .brand-row {
    display: grid;
  }

  .screen-tabs {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  textarea {
    min-height: 250px;
  }

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