/**
 * 巩固练习 · 大屏题目字号 + 答案解析面板
 */

body.l13rc-practice-one .practice-instruction {
  font-size: clamp(1.05rem, 1.4vw + 0.85rem, 1.45rem);
}

body.l13rc-practice-one .practice-body .instruction {
  font-size: clamp(1.15rem, 1.6vw + 0.9rem, 1.55rem);
  font-weight: 800;
  color: #334155;
  margin-bottom: clamp(14px, 1.8vh, 22px);
}

body.l13rc-practice-one .practice-body .sentence-box {
  font-size: clamp(1.35rem, 2.2vw + 0.95rem, 2.05rem);
  line-height: 1.7;
  letter-spacing: 0.01em;
}

body.l13rc-practice-one .practice-body input[type="text"] {
  font-size: clamp(1.1rem, 1.6vw + 0.9rem, 1.5rem);
  max-width: min(100%, 820px);
  padding: 0.5em 0.4em;
}

body.l13rc-practice-one .practice-body .choice-btn {
  font-size: clamp(1.08rem, 1.5vw + 0.9rem, 1.42rem);
  padding: clamp(16px, 2vh, 22px) clamp(20px, 2.5vw, 28px);
}

body.l13rc-practice-one .practice-body .role-selector {
  font-size: clamp(1rem, 1.3vw + 0.85rem, 1.25rem);
}

body.l13rc-practice-one .practice-body ins,
body.l13rc-practice-one .practice-body ins strong {
  font-size: 1.05em;
}

.practice-answer-toggle {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: clamp(16px, 2vh, 24px) auto 0;
  padding: 0.65em 1.2em;
  border: 2px solid #10b981;
  border-radius: 999px;
  background: #ecfdf5;
  color: #047857;
  font-family: var(--font-family, system-ui, sans-serif);
  font-size: clamp(0.95rem, 1.2vw + 0.75rem, 1.1rem);
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.2s, transform 0.15s;
}

.practice-answer-toggle:hover,
.practice-answer-toggle.is-open {
  background: #10b981;
  color: #fff;
}

.practice-answer-panel {
  margin-top: clamp(14px, 2vh, 20px);
  border-radius: 16px;
  border: 2px solid #a7f3d0;
  background: linear-gradient(180deg, #f0fdf4 0%, #fff 100%);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.12);
  overflow: hidden;
  max-height: min(42vh, 380px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.practice-answer-inner {
  padding: clamp(14px, 2vh, 22px) clamp(16px, 2.5vw, 28px);
  text-align: left;
}

.practice-answer-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1rem, 1.2vw + 0.85rem, 1.2rem);
  font-weight: 900;
  color: #065f46;
}

.practice-answer-label {
  display: inline-block;
  margin-right: 0.5em;
  padding: 0.15em 0.55em;
  border-radius: 6px;
  background: #d1fae5;
  color: #047857;
  font-size: 0.82em;
  font-weight: 800;
  vertical-align: middle;
}

.practice-answer-key {
  margin: 0 0 0.65rem;
  font-size: clamp(1rem, 1.15vw + 0.85rem, 1.15rem);
  font-weight: 700;
  color: #0f172a;
  line-height: 1.65;
}

.practice-answer-zh {
  margin: 0 0 0.75rem;
  font-size: clamp(0.95rem, 1vw + 0.8rem, 1.08rem);
  color: #475569;
  line-height: 1.6;
}

.practice-answer-mc {
  margin: 0 0 0.75rem;
  font-size: clamp(1rem, 1.1vw + 0.85rem, 1.12rem);
  font-weight: 700;
  color: #0f172a;
}

.practice-structure-heading {
  margin: 0.85rem 0 0.5rem;
  font-size: clamp(0.95rem, 1vw + 0.8rem, 1.08rem);
  font-weight: 900;
  color: #0369a1;
}

.practice-structure-list {
  margin: 0;
  padding: 0 0 0 1.15rem;
  list-style: decimal;
}

.practice-structure-list li {
  margin-bottom: 0.55rem;
  font-size: clamp(0.92rem, 1vw + 0.78rem, 1.05rem);
  line-height: 1.6;
  color: #334155;
}

.practice-structure-list li strong {
  display: block;
  color: #0f172a;
  font-weight: 800;
  margin-bottom: 0.15rem;
}

.practice-answer-tip {
  margin: 0.85rem 0 0;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  background: #fffbeb;
  border-left: 4px solid #f59e0b;
  font-size: clamp(0.9rem, 0.95vw + 0.75rem, 1rem);
  color: #78350f;
  line-height: 1.55;
}

body.l13rc-practice-one .choice-btn.is-correct {
  border-color: #10b981 !important;
  background: #ecfdf5 !important;
  box-shadow: inset 0 0 0 1px #10b981;
}

body.l13rc-practice-one .choice-btn.is-wrong {
  border-color: #f87171 !important;
  background: #fef2f2 !important;
}

@media (min-width: 1200px) {
  body.l13rc-practice-one .practice-body .sentence-box {
    font-size: clamp(1.5rem, 1.6vw + 1rem, 2.2rem);
  }
}

@media print {
  .practice-answer-toggle {
    display: none;
  }

  .practice-answer-panel {
    display: block !important;
    max-height: none;
    overflow: visible;
    break-inside: avoid;
  }

  .practice-answer-panel[hidden] {
    display: block !important;
  }
}