/* site-article.css —— 文章页整合样式（单文件） */
/* 基础变量 */
:root{
  --c-text:#111827;--c-muted:#6b7280;--c-border:#e5e7eb;--c-soft:#f8fafc;--c-bg:#ffffff;
  --c-brand:#0ea5e9;--c-brand-2:#3b82f6;--radius:16px;--shadow:0 6px 24px rgba(0,0,0,.07);
  --container:clamp(980px,92vw,1260px);--sidew:300px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  background:var(--c-bg);color:var(--c-text);line-height:1.75;
}
a{color:var(--c-brand);text-decoration:none}
a:hover{text-decoration:underline}

/* 顶部阅读进度条 */
.progress{
  position:fixed;top:0;left:0;height:3px;width:0;
  background:linear-gradient(90deg,var(--c-brand),var(--c-brand-2));
  z-index:9999;
}

/* 布局与卡片 */
.container{width:var(--container);margin:0 auto;padding:24px}
.breadcrumb{font-size:13px;color:var(--c-muted);margin:8px 0 16px}
.breadcrumb a{color:var(--c-muted)}
.grid{
  display:grid;
  grid-template-columns:minmax(260px,var(--sidew)) 1fr;
  gap:28px;
  align-items:start;
}
@media (max-width:1024px){
  .grid{grid-template-columns:1fr}
}
.card{
  background:#fff;
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

/* 左侧栏：目录 + 联系方式 */
.sidebar{position:sticky;top:16px}
.toc{padding:16px}
.toc h3{margin:0 0 10px;font-size:16px}
.toc-nav{max-height:65vh;overflow:auto;padding-right:4px}
.toc-nav a{
  display:block;
  padding:6px 10px;
  border-radius:10px;
  font-size:14px;
  color:#64748b;
  text-decoration:none;
}
.toc-nav a:hover{background:#f8fafc}
.toc-nav a.h3{padding-left:22px}
.toc-nav a.active{
  background:linear-gradient(180deg,#eef6ff,#ffffff);
  border:1px solid #dbeafe;
  color:#1d4ed8;
  box-shadow:0 6px 18px rgba(29,78,216,.08);
}
.toc-empty{color:#9ca3af}

.contact{margin-top:16px;padding:16px}
.contact .row{
  display:flex;
  align-items:center;
  gap:10px;
  margin:6px 0;
}
.btn{
  display:inline-block;
  padding:10px 14px;
  border-radius:12px;
  background:var(--c-brand);
  color:#fff;
  text-decoration:none;
}
.btn.secondary{background:#10b981}

/* 主体文章 */
.post{padding:24px}
.post .post-header{text-align:center}
.post h1{
  font-size:clamp(24px,2.3vw,34px);
  margin:6px 0 8px;
}
.meta{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  justify-content:center;
  color:var(--c-muted);
  font-size:14px;
}
.meta span+span::before{
  content:'·';
  margin:0 8px;
  color:#cbd5e1;
}

/* 头图 */
.feature{margin:14px 0;border-radius:14px;overflow:hidden}
.feature img{width:100%;height:auto;display:block}

/* 正文排版基础（PC） */
.entry-content{font-size:16px}
.entry-content h2{font-size:22px;margin-top:1.6em}
.entry-content h3{font-size:18px;margin-top:1.1em}
.entry-content img{
  max-width:100%;
  height:auto;
  border-radius:10px;
  display:block;
  margin:1em auto;
}
.entry-content table{width:100%;border-collapse:collapse}
.entry-content th,.entry-content td{
  border:1px solid var(--c-border);
  padding:10px;
}

/* 标签、分享、上下篇 */
.tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:16px 0;
}
.tag{
  font-size:12px;
  padding:6px 10px;
  background:var(--c-soft);
  border:1px solid var(--c-border);
  border-radius:999px;
}
.share{
  display:flex;
  gap:12px;
  align-items:center;
  border-top:1px solid var(--c-border);
  padding-top:16px;
  margin-top:16px;
  color:var(--c-muted);
}
.pn{
  display:flex;
  justify-content:space-between;
  gap:10px;
  border-top:1px solid var(--c-border);
  padding-top:18px;
  margin-top:14px;
}
.pn a{
  display:block;
  padding:10px 12px;
  border:1px solid var(--c-border);
  border-radius:10px;
  background:var(--c-soft);
}

/* 相关文章：3 列 × 2 行卡片，上图下文；自适应收缩 */
.related h3{font-size:18px;margin:0 0 10px}
.related-list{
  list-style:none;
  padding:0;
  margin:0;
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
}
@media (max-width: 900px){
  .related-list{ grid-template-columns:repeat(2,1fr); }
}
@media (max-width: 640px){
  .related-list{ grid-template-columns:1fr; }
}
.related-item{
  display:block;
  padding:10px;
  border:1px solid var(--c-border);
  border-radius:12px;
  background:#fff;
}
.related-item:hover{
  background:var(--c-soft);
  text-decoration:none;
}
.ri-thumb{
  display:block;
  width:100%;
  aspect-ratio:4/3;
  border-radius:10px;
  overflow:hidden;
  background:#f1f5f9;
  border:1px solid var(--c-border);
  margin-bottom:8px;
}
.ri-thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.ri-title{
  display:block;
  font-size:15px;
  line-height:1.6;
  color:#0f172a;
  overflow-wrap:anywhere;
}

.pd-hr{
  border:0;
  height:12px;
  margin:10px auto 16px;
  max-width:900px;
  background:
    linear-gradient(#e5e7eb,#e5e7eb) center/100% 1px no-repeat,
    linear-gradient(90deg,#00c9ff,#00a3ff,#3f51b5,#9c27b0,#e91e63,#ff6a00,#4caf50) center/220px 3px no-repeat;
  border-radius:3px;
  opacity:.95;
}

/* ============================
   Article content bullets & FAQ (PC only)
   ============================ */

/* 文章容器基础：PC 端文章内容区域 */
.article-content,
.content,
.post-content{
  font-size:16px;
  line-height:1.8;
  color:#333;
}

/* 恢复文章里的 UL/OL 小圆点与数字（覆盖全局 reset） */
.article-content ul,
.content ul,
.post-content ul{
  list-style-type:disc !important;
  list-style-position:outside;
  margin:0.6em 0 0.6em 1.6em;
  padding-left:0;
}
.article-content ol,
.content ol,
.post-content ol{
  list-style-type:decimal !important;
  list-style-position:outside;
  margin:0.6em 0 0.6em 1.8em;
  padding-left:0;
}
.article-content li,
.content li,
.post-content li{
  margin:0.2em 0;
}

/* 以加粗开头的说明段，自动补一个小圆点（厚度范围 / 特点 / 适用于 …） */
.article-content p > strong:first-child,
.content p > strong:first-child,
.post-content p > strong:first-child{
  position:relative;
  padding-left:0.9em;
}
.article-content p > strong:first-child::before,
.content p > strong:first-child::before,
.post-content p > strong:first-child::before{
  content:"•";
  position:absolute;
  left:0;
  top:0.1em;
  font-weight:700;
  color:#111827;
}

/* FAQ 折叠块：details + summary */
.article-content details,
.content details,
.post-content details{
  border:1px solid #dbeafe;
  background:#f8fafc;
  border-radius:12px;
  padding:14px 16px;
  margin:14px 0;
  transition:all 0.25s ease;
  box-shadow:0 4px 12px rgba(14,165,233,0.05);
}
.article-content details[open],
.content details[open],
.post-content details[open]{
  background:#eff6ff;
  border-color:#bfdbfe;
  box-shadow:0 6px 16px rgba(14,165,233,0.12);
}
.article-content summary,
.content summary,
.post-content summary{
  cursor:pointer;
  font-weight:600;
  font-size:15px;
  color:#0f172a;
  display:flex;
  align-items:center;
  gap:8px;
  list-style:none;
}
.article-content summary::before,
.content summary::before,
.post-content summary::before{
  content:"Q";
  width:20px;
  height:20px;
  background:#3b82f6;
  color:#fff;
  border-radius:999px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:11px;
  font-weight:700;
}
summary::-webkit-details-marker{
  display:none;
}
.article-content details p,
.content details p,
.post-content details p{
  font-size:14px;
  color:#475569;
  margin:10px 0 0 28px;
  line-height:1.7;
}