/* HSK1 Practice Exam — baithi */
:root {
  --exam-ink: #1c2a3a;
  --exam-muted: #5a6b7d;
  --exam-accent: #c45c26;
  --exam-accent-2: #1f6f5b;
  --exam-paper: #f7f3ec;
  --exam-line: #e2d8c8;
  --exam-ok: #1f6f5b;
  --exam-bad: #b42318;
}

body.baithi-body {
  background:
    radial-gradient(circle at 12% 8%, rgba(196, 92, 38, 0.12), transparent 40%),
    radial-gradient(circle at 88% 0%, rgba(31, 111, 91, 0.1), transparent 35%),
    linear-gradient(180deg, #efe7da 0%, var(--exam-paper) 40%, #f3eee6 100%);
  color: var(--exam-ink);
  min-height: 100vh;
}

.baithi-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 1rem 6rem;
}

.baithi-hero {
  display: grid;
  gap: 0.75rem;
  padding: 1.5rem 0 1rem;
  border-bottom: 1px solid var(--exam-line);
  margin-bottom: 1.25rem;
}

.baithi-hero .brand {
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0;
}

.baithi-hero .brand span {
  color: var(--exam-accent);
}

.baithi-hero p {
  margin: 0;
  color: var(--exam-muted);
  max-width: 40rem;
}

.stat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.stat-chips span {
  background: #fff;
  border: 1px solid var(--exam-line);
  padding: 0.35rem 0.7rem;
  font-size: 0.85rem;
  color: var(--exam-muted);
}

.intro-card,
.result-card,
.exam-shell {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--exam-line);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.section-head h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.section-head p {
  color: var(--exam-muted);
  margin-bottom: 1rem;
}

.q-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding: 1rem 0;
  border-top: 1px dashed var(--exam-line);
}

@media (min-width: 768px) {
  .q-block {
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
  }
}

.q-img,
.opt-img {
  max-height: 150px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--exam-line);
  padding: 0.35rem;
}

.visual-card {
  min-height: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #fff 0%, #f4ebe0 100%);
  border: 1px solid var(--exam-line);
  padding: 1rem;
}

.visual-zh {
  font-family: "Noto Serif SC", serif;
  font-size: 2rem;
  line-height: 1.2;
}

.visual-vi {
  color: var(--exam-muted);
  font-size: 0.9rem;
  margin-top: 0.35rem;
}

.q-num {
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.zh {
  font-family: "Noto Serif SC", "Microsoft YaHei", serif;
  font-size: 1.25rem;
}

.py {
  color: var(--exam-muted);
  font-size: 0.9rem;
}

.choice-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.choice-card {
  display: block;
  border: 1px solid var(--exam-line);
  background: #fff;
  padding: 0.5rem;
  cursor: pointer;
  text-align: center;
}

.choice-card:has(input:checked) {
  border-color: var(--exam-accent-2);
  box-shadow: inset 0 0 0 2px rgba(31, 111, 91, 0.25);
}

.choice-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.choice-key {
  display: inline-block;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--exam-accent);
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .options-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.opt-cell {
  background: #fff;
  border: 1px solid var(--exam-line);
  padding: 0.5rem;
  text-align: center;
}

.example-box {
  display: grid;
  gap: 0.5rem;
  background: #f0ebe3;
  border-left: 4px solid var(--exam-accent);
  padding: 0.75rem 1rem;
  margin-bottom: 0.75rem;
}

.box-ans {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--exam-accent-2);
}

.letter-input {
  max-width: 6rem;
  text-align: center;
  font-weight: 700;
  text-transform: uppercase;
}

.q-feedback {
  margin-top: 0.5rem;
  font-weight: 600;
}

.q-feedback.ok {
  color: var(--exam-ok);
}

.q-feedback.bad {
  color: var(--exam-bad);
}

.side-nav {
  position: sticky;
  top: 0.75rem;
}

.btn-question {
  min-width: 2.4rem;
  margin: 0.15rem;
  border: 1px solid var(--exam-line);
  background: #fff;
  color: var(--exam-ink);
}

.btn-question.answered {
  background: #e8f2ef;
  border-color: #9ec5b8;
}

.btn-question.btn-question-active {
  outline: 2px solid var(--exam-accent);
}

.btn-question.correct {
  background: #d8f3e8;
  border-color: var(--exam-ok);
}

.btn-question.wrong {
  background: #fde8e6;
  border-color: var(--exam-bad);
}

.btn-listen.playing {
  background: var(--exam-accent-2);
  color: #fff;
  border-color: var(--exam-accent-2);
}

.divCountdown {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 50;
  background: var(--exam-ink);
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 0.35rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  text-align: center;
}

.divCountdown #countdown {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.exam-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  margin: 1rem 0;
}

.worksheet-block {
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--exam-line);
}

.worksheet-frame {
  background: #fff;
  border: 1px solid var(--exam-line);
  padding: 0.5rem;
  margin-bottom: 0.75rem;
  overflow: auto;
}

.worksheet-img {
  max-width: 100%;
  height: auto;
  display: block;
}

.worksheet-q.q-block {
  grid-template-columns: 1fr;
  border-top: none;
  padding: 0.5rem 0;
}

.audio-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.audio-row audio {
  max-width: 100%;
  height: 36px;
}

.structure-list {
  columns: 1;
}

@media (min-width: 700px) {
  .structure-list {
    columns: 2;
  }
}

.structure-list li {
  break-inside: avoid;
  margin-bottom: 0.4rem;
}