:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #5f6d7a;
  --paper: #ffffff;
  --page: #f3f6f4;
  --line: #d7dfd8;
  --soft: #edf4f0;
  --accent: #1f7668;
  --accent-dark: #13594e;
  --right: #22794d;
  --right-bg: #e8f6ee;
  --wrong: #b8473f;
  --wrong-bg: #fff0ef;
  --focus: #f3bb43;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang HK", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
  line-height: 1.5;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.page {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.hero {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 280px);
  gap: 24px;
  align-items: end;
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: .92rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.lede {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.score-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.score-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
}

.score-row span {
  color: var(--muted);
  font-size: .9rem;
}

.score-row strong {
  color: var(--accent-dark);
  font-size: 1.65rem;
  line-height: 1;
}

progress {
  width: 100%;
  height: 12px;
  accent-color: var(--accent);
}

#progress-text,
.paper-meta {
  margin: 0;
  color: var(--muted);
  font-size: .92rem;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  background: rgba(243, 246, 244, .96);
  backdrop-filter: blur(12px);
}

.tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tabs button,
.actions button,
.listen-button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  padding: 9px 14px;
  white-space: nowrap;
}

.tabs button[aria-pressed="true"],
.actions button.primary,
.listen-button {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

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

.actions button[disabled] {
  cursor: not-allowed;
  opacity: .5;
}

.actions button[aria-pressed="true"] {
  border-color: var(--wrong);
  background: var(--wrong-bg);
  color: var(--wrong);
}

.paper-meta {
  padding: 0 0 16px;
}

.paper-content {
  display: grid;
  gap: 22px;
}

.selected-panel {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.selected-panel strong {
  color: var(--accent-dark);
}

.selected-words {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.selected-words span {
  padding: 5px 8px;
  border-radius: 6px;
  background: var(--soft);
  color: var(--ink);
  font-size: .92rem;
  font-weight: 700;
}

.paper-section {
  display: grid;
  gap: 14px;
}

.section-heading {
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  letter-spacing: 0;
}

.word-bank {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.word-bank strong {
  color: var(--accent-dark);
}

.word-bank-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.word-bank-list span {
  padding: 5px 8px;
  border-radius: 6px;
  background: var(--soft);
  color: var(--ink);
  font-size: .92rem;
  font-weight: 700;
}

.questions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.question {
  display: grid;
  gap: 12px;
  align-content: start;
  min-height: 214px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.question.sentence-writing {
  min-height: 250px;
}

.question.correct {
  border-color: rgba(34, 121, 77, .5);
  background: var(--right-bg);
}

.question.incorrect {
  border-color: rgba(184, 71, 63, .55);
  background: var(--wrong-bg);
}

.question-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.question-number {
  color: var(--accent-dark);
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1;
}

.module-label {
  padding: 4px 8px;
  border-radius: 6px;
  background: var(--soft);
  color: var(--muted);
  font-size: .82rem;
  font-weight: 700;
}

.prompt {
  margin: 0;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 750;
}

.dictation-control {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
}

.blank-answer,
.dictation-control,
textarea {
  width: 100%;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
}

input {
  min-height: 44px;
  padding: 9px 11px;
}

textarea {
  min-height: 92px;
  padding: 10px 12px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
}

.feedback {
  min-height: 42px;
  margin: 0;
  color: var(--muted);
  font-size: .92rem;
}

.question.correct .feedback {
  color: var(--right);
  font-weight: 700;
}

.question.incorrect .feedback {
  color: var(--wrong);
  font-weight: 700;
}

.empty-state {
  grid-column: 1 / -1;
  margin: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  text-align: center;
}

@media (max-width: 860px) {
  .hero,
  .toolbar,
  .questions {
    grid-template-columns: 1fr;
  }

  .toolbar {
    position: static;
  }

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

@media (max-width: 520px) {
  .page {
    width: min(100% - 20px, 1160px);
    padding-top: 18px;
  }

  .hero {
    padding-top: 12px;
  }

  .dictation-control {
    grid-template-columns: 1fr;
  }

  .question,
  .question.sentence-writing {
    min-height: 0;
  }
}