/* 思研科技 · 常见问题（FAQ）组件 · 2026-10-22
   自包含、无 JS 依赖，使用原生 details/summary，移动端友好 */
.sd-faq{
  max-width:920px;
  margin:0 auto;
  display:grid;
  gap:12px;
}
.sd-faq-item{
  background:#fff;
  border:1px solid var(--line,#e2e9f2);
  border-left:3px solid var(--blue-ink,#1b5fa8);
  border-radius:12px;
  box-shadow:0 2px 10px rgba(20,55,95,.04);
  overflow:hidden;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.sd-faq-item:hover{
  border-color:var(--c-blue-100-3,#cfe0f2);
  box-shadow:0 6px 18px rgba(20,55,95,.08);
}
.sd-faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 20px;
  cursor:pointer;
  list-style:none;
  font-size:16px;
  font-weight:600;
  line-height:1.6;
  color:var(--ink-deep,#0f2740);
}
.sd-faq-item summary::-webkit-details-marker{display:none;}
.sd-faq-item summary::after{
  content:"+";
  flex:0 0 auto;
  width:24px;
  height:24px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:var(--c-blue-50-4,#eef5fc);
  color:var(--blue-ink,#1b5fa8);
  font-size:18px;
  font-weight:600;
  line-height:1;
}
.sd-faq-item[open] summary::after{content:"−";}
.sd-faq-item[open] summary{color:var(--blue-ink,#1b5fa8);}
.sd-faq-a{
  padding:0 20px 18px;
  font-size:15px;
  line-height:1.9;
  color:var(--text-2,#4a5a6b);
}
.sd-faq-a p{margin:0;}
.sd-faq-a p + p{margin-top:8px;}
@media (max-width:640px){
  .sd-faq-item summary{font-size:15px;padding:14px 16px;}
  .sd-faq-a{padding:0 16px 16px;font-size:14px;line-height:1.85;}
}