/* ===== 折叠栏整体：灰蓝气泡 ===== */
details {
  display: block;
  background: #eef1f7;
  border-radius: 14px;
  padding: 12px 16px;
  margin-bottom: 14px;
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #dce0e8;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

/* ===== 折叠标题：浅灰气泡，撑满宽度 ===== */
details summary {
  display: block;
  list-style: none;
  cursor: pointer;
  background: #f0f2f5;
  border-radius: 18px;
  padding: 10px 18px;
  font-weight: bold;
  color: #1a1a2e;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  text-align: left;
}

/* ===== 隐藏默认三角箭头 ===== */
details summary::-webkit-details-marker {
  display: none;
}
details summary::marker {
  display: none;
  content: "";
}

/* ===== 仅折叠栏外部的正文段落缩进两格 ===== */
details ~ p {
  text-indent: 2em !important;
}