*{box-sizing:border-box}
:root{
  --bg:#f3f7fc;
  --bg2:#eef4fb;
  --panel:#ffffff;
  --text:#1f2a44;
  --muted:#60708a;
  --line:#e2eaf5;
  --primary:#4a90e2;
  --primary-dark:#2f6fba;
  --primary-soft:#eef5ff;
  --shadow:0 10px 30px rgba(39,73,124,.08);
}

html,body{margin:0;padding:0}

body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:linear-gradient(180deg,var(--bg2),var(--bg));
}

a{text-decoration:none;color:inherit}

.page-shell{
  max-width:1180px;
  margin:0 auto;
  padding:24px 20px 60px;
}

.card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:28px;
  box-shadow:var(--shadow);
}

/* ===== 顶部 ===== */

.top-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--primary-dark);
  font-weight:700;
  margin-bottom:16px;
}

.page-title{margin-bottom:18px}

.page-title h1{
  font-size:34px;
  margin:0 0 10px;
}

.page-subtitle{
  color:var(--muted);
}

/* ===== 工具栏 ===== */

.toolbar{
  padding:18px 20px;
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  align-items:flex-end;
  margin-bottom:18px;
}

.select{
  padding:10px 12px;
  border-radius:14px;
  border:1px solid var(--line);
}

.notice{
  padding:12px 14px;
  border-radius:14px;
  background:#fff8e9;
  border:1px solid #f1dfae;
  color:#725b20;
}

/* ===== 场景 ===== */

.set-header{
  margin:18px 0 14px;
}

.scene-card{
  overflow:hidden;
  margin-bottom:14px;
}

.scene-header{
  width:100%;
  border:0;
  padding:18px 20px;
  display:flex;
  justify-content:space-between;
  cursor:pointer;
  background:#f7faff;
}

.scene-name{
  font-size:24px;
  font-weight:800;
}

.scene-content{
  display:none;
  border-top:1px solid var(--line);
  padding:18px 20px;
}

.scene-content.open{display:block}

/* ===== 句子 ===== */

.line-list{
  display:flex;
  flex-direction:column;
  gap:12px;
}

.line-item{
  display:flex;
  gap:12px;
  padding:14px;
  border:1px solid var(--line);
  border-radius:18px;
  background:#fbfdff;
}

.sentence-controls{
  display:flex;
  flex-direction:column;
  gap:8px;
  min-width:130px;
}

.play-btn,.record-btn,.mine-btn,.text-toggle-btn{
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px;
  background:#fff;
  cursor:pointer;
}

.play-btn{
  background:var(--primary-soft);
  color:var(--primary-dark);
}

.mine-btn:disabled{
  opacity:.4;
}

.sentence-wrap{
  flex:1;
}

.line-label{
  font-weight:700;
  margin-bottom:6px;
}

.line-text{
  font-size:18px;
  line-height:1.7;
}

/* ✅ 关键修复：隐藏逻辑 */

.hidden-text{
  display:none;
}

.hidden-text.show{
  display:block;
}

/* ✅ Vocabulary 专门控制（重点） */

.vocab-grid{
  display:none;
}

.vocab-grid.show{
  display:grid;
}

/* ===== Vocabulary ===== */

.block-title{
  margin:18px 0 10px;
  font-size:18px;
}

.vocab-grid{
  grid-template-columns:repeat(2,1fr);
  gap:10px;
}

.vocab-item{
  padding:12px;
  border-radius:16px;
  border:1px solid var(--line);
  background:#f8fbff;
}

/* ===== 移动端 ===== */

@media (max-width: 840px){
  .line-item{
    flex-direction:column;
  }
  .sentence-controls{
    flex-direction:row;
    flex-wrap:wrap;
  }
  .vocab-grid{
    grid-template-columns:1fr;
  }
}