/* ============================================================
   Surge官网 · components.css
   跨页面组件:tabs / toc / FAQ / 术语卡 / 下载客户端卡 /
   博客文章卡 / callout / dl-fab / 文末引导卡 / 徽章
   ============================================================ */

/* ---------- Tab 切换(通用) ---------- */
.tab-list{
  display:flex; flex-wrap:wrap; gap:0;
  border:1px solid var(--border);
  background:var(--bg-panel);
  margin-bottom:20px;
}
.tab-btn{
  position:relative;
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 18px;
  font-size:13px;
  color:var(--text-muted);
  border-right:1px dashed var(--dash-soft);
  transition:color .15s linear,background .15s linear;
  white-space:nowrap;
}
.tab-btn:last-child{ border-right:0; }
.tab-btn code{
  font-size:9.5px;
  letter-spacing:.12em;
  color:var(--text-muted);
}
.tab-btn:hover{ color:var(--text); background:var(--bg-panel2); }
.tab-btn[aria-selected="true"]{ color:var(--text); background:var(--bg-panel2); }
.tab-btn[aria-selected="true"] code{ color:var(--accent); }
.tab-btn[aria-selected="true"]::after{
  content:"";
  position:absolute; left:0; right:0; bottom:0;
  height:3px;
  background:var(--stripe-thin);
}
.tab-panel{ min-width:0; }

/* 竖排配电柜变体(首页特性区) */
.tabs-rail{
  display:grid;
  grid-template-columns:280px 1fr;
  gap:0;
  border:1px solid var(--border);
  background:var(--bg-panel);
}
.tabs-rail .tab-list{
  display:block;
  border:0;
  border-right:1px dashed var(--dash);
  background:none;
  margin-bottom:0;
}
.tabs-rail .tab-btn{
  display:flex; width:100%;
  align-items:center; gap:10px;
  padding:16px 18px;
  border-right:0;
  border-bottom:1px dashed var(--dash-soft);
  font-size:13.5px;
  text-align:left;
}
.tabs-rail .tab-btn:last-child{ border-bottom:0; }
.tabs-rail .tab-btn code{
  font-size:9.5px;
  letter-spacing:.14em;
  flex:none;
}
.tabs-rail .tab-btn:hover{ background:none; color:var(--text); }
.tabs-rail .tab-btn[aria-selected="true"]{ background:none; }
.tabs-rail .tab-btn[aria-selected="true"]::after{
  left:0; right:auto; top:14px; bottom:14px;
  width:4px; height:auto;
}
.tabs-rail .tab-panels{
  padding:26px 30px;
  min-width:0;
}
.tabs-rail .tab-panel h3{
  font-size:17px;
  font-weight:800;
  margin-bottom:10px;
  display:flex; align-items:center; gap:8px;
}
.tabs-rail .tab-panel h3::before{
  content:"";
  width:7px; height:7px;
  background:var(--accent);
  flex:none;
}
.tabs-rail .tab-panel p{
  color:var(--text-muted);
  font-size:13.5px;
  line-height:1.85;
  margin-bottom:12px;
}
.tabs-rail .tab-panel p strong{ color:var(--text); font-weight:600; }
.tabs-rail .tab-panel .panel-facts{
  display:flex; flex-wrap:wrap; gap:8px;
  margin-top:16px;
}
@media (max-width:820px){
  .tabs-rail{ grid-template-columns:1fr; }
  .tabs-rail .tab-list{
    border-right:0;
    border-bottom:1px dashed var(--dash);
  }
  .tabs-rail .tab-btn{ padding:13px 16px; }
  .tabs-rail .tab-btn[aria-selected="true"]::after{
    top:auto; bottom:0; left:0; right:0;
    width:auto; height:3px;
  }
  .tabs-rail .tab-panels{ padding:20px 18px; }
}
@media (max-width:640px){
  .tab-list{ overflow-x:auto; flex-wrap:nowrap; -webkit-overflow-scrolling:touch; }
  .tab-btn{ flex:none; }
}

/* ---------- 长页分类跳转导航(toc) ---------- */
.toc-tabs{
  display:flex; flex-wrap:wrap; gap:0;
  border:1px solid var(--border);
  background:var(--bg-panel);
  margin-bottom:28px;
}
.toc-tabs a{
  display:inline-flex; align-items:center; gap:8px;
  padding:11px 16px;
  font-size:12.5px;
  color:var(--text-muted);
  border-right:1px dashed var(--dash-soft);
  transition:color .15s linear,background .15s linear;
  white-space:nowrap;
}
.toc-tabs a:last-child{ border-right:0; }
.toc-tabs a code{
  font-size:9.5px;
  letter-spacing:.12em;
  color:var(--accent);
}
.toc-tabs a:hover{ color:var(--text); background:var(--bg-panel2); }
@media (max-width:640px){
  .toc-tabs{ flex-wrap:nowrap; overflow-x:auto; -webkit-overflow-scrolling:touch; }
  .toc-tabs a{ flex:none; }
}

/* ---------- FAQ 折叠项 ---------- */
.faq-list{ border:1px solid var(--border); background:var(--bg-panel); }
.faq-item + .faq-item{ border-top:1px dashed var(--dash-soft); }
.faq-item summary{
  list-style:none;
  display:flex; align-items:center; gap:12px;
  padding:15px 18px;
  cursor:pointer;
  font-size:14px;
  font-weight:600;
  transition:background .15s linear;
  user-select:none;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary:hover{ background:var(--bg-panel2); }
.faq-item summary .q-no{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.12em;
  color:var(--accent);
  flex:none;
}
.faq-item summary .q-text{ flex:1; min-width:0; }
.faq-item summary .ico{
  flex:none;
  color:var(--text-muted);
  transition:transform .18s linear;
}
.faq-item[open] summary .ico{ transform:rotate(45deg); color:var(--accent); }
.faq-item .faq-a{
  padding:0 18px 16px 46px;
  color:var(--text-muted);
  font-size:13px;
  line-height:1.85;
}
.faq-item .faq-a p{ margin-bottom:10px; }
.faq-item .faq-a p:last-child{ margin-bottom:0; }
.faq-item .faq-a strong{ color:var(--text); font-weight:600; }
.faq-item .faq-a code{
  font-size:11.5px;
  color:var(--accent);
  background:var(--chip-bg);
  padding:1px 5px;
}
@media (max-width:640px){
  .faq-item .faq-a{ padding-left:18px; }
}

/* ---------- 术语卡 ---------- */
.term-card{
  background:var(--bg-panel);
  border:1px solid var(--border);
  padding:18px 20px;
  min-width:0;
}
.term-card .term-head{
  display:flex; align-items:baseline; gap:10px; flex-wrap:wrap;
  margin-bottom:8px;
}
.term-card .term-head h3{
  font-size:15px;
  font-weight:800;
}
.term-card .term-head code{
  font-size:10px;
  letter-spacing:.12em;
  color:var(--accent);
  border:1px dashed var(--dash-soft);
  padding:2px 7px;
}
.term-card p{
  font-size:13px;
  color:var(--text-muted);
  line-height:1.8;
}
.term-card p strong{ color:var(--text); font-weight:600; }

/* ---------- 徽章 ---------- */
.badge{
  display:inline-flex; align-items:center;
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.14em;
  padding:3px 8px;
  border:1px solid var(--border);
  color:var(--text-muted);
  white-space:nowrap;
  max-width:100%;
  overflow:hidden;
  flex:none;
}
.badge--pick{
  background:var(--accent);
  border-color:var(--accent);
  color:var(--bg);
  font-weight:700;
}
.badge--rec{
  border-color:var(--accent-dark);
  color:var(--accent);
}
.badge--eol{
  border-color:var(--error);
  color:var(--error);
}

/* ---------- 下载客户端卡片 ---------- */
.dl-card{
  position:relative;
  background:var(--bg-panel);
  border:1px solid var(--border);
  padding:20px 22px;
  min-width:0;
  display:flex; flex-direction:column; gap:12px;
}
.dl-card--pick{ border-color:var(--accent-dark); }
.dl-card--pick::before{
  content:"";
  position:absolute; left:-1px; right:-1px; top:-1px;
  height:5px;
  background:var(--stripe-thin);
}
.dl-card-head{
  display:flex; align-items:center; gap:14px;
}
.dl-card-head img{
  width:52px; height:52px;
  flex:none;
  display:block;
}
.dl-card-name{ min-width:0; flex:1; }
.dl-card-name h3{
  font-size:16px;
  font-weight:800;
  display:flex; align-items:center; gap:10px; flex-wrap:wrap;
}
.dl-card-name .dl-ver{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--text-muted);
  margin-top:3px;
}
.dl-card-name .dl-ver b{ color:var(--accent); font-weight:500; }
.dl-card-desc{
  font-size:13px;
  color:var(--text-muted);
  line-height:1.8;
}
.dl-card-desc strong{ color:var(--text); font-weight:600; }
.dl-card-meta{
  display:flex; flex-wrap:wrap; gap:8px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--text-muted);
}
.dl-card-meta span{
  border:1px dashed var(--dash-soft);
  padding:3px 8px;
  max-width:100%;
  overflow:hidden;
}
.dl-card-meta b{ color:var(--text); font-weight:500; }
.dl-card-actions{
  margin-top:auto;
  display:flex; flex-wrap:wrap; gap:10px;
  padding-top:14px;
  border-top:1px dashed var(--dash-soft);
}
.dl-card-note{
  font-size:12px;
  color:var(--text-muted);
  line-height:1.7;
}
.dl-card-note a{ color:var(--accent); border-bottom:1px dashed var(--dash); }
.dl-card-note a:hover{ border-bottom-color:var(--accent); }

/* ---------- 系统要求小表 ---------- */
.sysreq{
  border:1px solid var(--border);
  background:var(--bg-panel);
  padding:14px 18px;
  font-size:12.5px;
  color:var(--text-muted);
  line-height:1.9;
}
.sysreq h4{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--accent);
  margin-bottom:8px;
}
.sysreq strong{ color:var(--text); font-weight:600; }

/* ---------- 博客文章卡 ---------- */
.post-card{
  display:flex; flex-direction:column; gap:10px;
  background:var(--bg-panel);
  border:1px solid var(--border);
  padding:20px 22px;
  min-width:0;
  transition:border-color .15s linear;
}
.post-card:hover{ border-color:var(--dash); }
.post-card-meta{
  display:flex; align-items:center; gap:10px; flex-wrap:wrap;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--text-muted);
}
.post-card-meta .post-tag{
  color:var(--accent);
  border:1px dashed var(--dash-soft);
  padding:2px 8px;
  max-width:100%;
  overflow:hidden;
  white-space:nowrap;
}
.post-card h3{
  font-size:16px;
  font-weight:800;
  line-height:1.5;
}
.post-card h3 a{ transition:color .15s linear; }
.post-card h3 a:hover{ color:var(--accent); }
.post-card p{
  font-size:13px;
  color:var(--text-muted);
  line-height:1.8;
}
.post-card .post-more{
  margin-top:auto;
  padding-top:12px;
  font-size:12.5px;
  font-weight:600;
  color:var(--accent);
  display:inline-flex; align-items:center; gap:6px;
}

/* ---------- 标签筛选按钮(博客列表) ---------- */
.tag-filter{
  display:flex; flex-wrap:wrap; gap:8px;
  margin-bottom:24px;
}
.tag-filter button{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--text-muted);
  border:1px dashed var(--dash-soft);
  padding:6px 12px;
  max-width:100%;
  overflow:hidden;
  transition:color .15s linear,border-color .15s linear,background .15s linear;
}
.tag-filter button:hover{ color:var(--text); border-color:var(--dash); }
.tag-filter button.is-on{
  background:var(--accent);
  border:1px solid var(--accent);
  color:var(--bg);
  font-weight:700;
}

/* ---------- callout 引用块 ---------- */
.callout{
  border:1px solid var(--border);
  border-left:4px solid var(--accent);
  background:var(--bg-panel);
  padding:14px 18px;
  margin:0 0 16px;
  font-size:13px;
  line-height:1.8;
  color:var(--text-muted);
}
.callout strong{ color:var(--text); font-weight:600; }
.callout .callout-tag{
  display:block;
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.14em;
  color:var(--accent);
  margin-bottom:6px;
}
.callout--warn{ border-left-color:var(--warn); }
.callout--warn .callout-tag{ color:var(--warn); }
.callout--error{ border-left-color:var(--error); }
.callout--error .callout-tag{ color:var(--error); }
.callout--ok{ border-left-color:var(--success); }
.callout--ok .callout-tag{ color:var(--success); }

/* ---------- 文章页面包屑 ---------- */
.crumbs{
  display:flex; align-items:center; flex-wrap:wrap; gap:8px;
  font-size:12px;
  color:var(--text-muted);
  margin-top:28px;
  margin-bottom:24px;
}
.crumbs a{ color:var(--text-muted); transition:color .15s linear; }
.crumbs a:hover{ color:var(--accent); }
.crumbs .sep{ color:var(--dash); }
.crumbs [aria-current]{ color:var(--text); }

/* ---------- 文章 Hero 元信息 ---------- */
.post-hero-meta{
  display:flex; align-items:center; flex-wrap:wrap; gap:10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--text-muted);
  margin-bottom:16px;
}
.post-hero-meta .post-tag{
  color:var(--accent);
  border:1px dashed var(--dash-soft);
  padding:2px 8px;
  max-width:100%;
  overflow:hidden;
}

/* ---------- 文末下载引导卡 ---------- */
.post-cta{
  position:relative;
  background:var(--bg-panel);
  border:1px solid var(--border);
  padding:26px 28px;
  margin-top:40px;
}
.post-cta::before{
  content:"";
  position:absolute; left:-1px; right:-1px; top:-1px;
  height:5px;
  background:var(--stripe-thin);
}
.post-cta h2{
  font-size:18px;
  font-weight:800;
  margin-bottom:8px;
}
.post-cta p{
  font-size:13px;
  color:var(--text-muted);
  line-height:1.8;
  margin-bottom:16px;
}
.post-cta .cta-actions{ display:flex; flex-wrap:wrap; gap:12px; }

/* ---------- 延伸阅读 / 上一篇下一篇挂载区 ---------- */
.related-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.related-grid > *{ min-width:0; }
@media (max-width:900px){ .related-grid{ grid-template-columns:1fr; } }
.post-nav{
  display:grid; grid-template-columns:1fr 1fr; gap:16px;
  margin-top:28px;
}
.post-nav a{
  display:block;
  border:1px solid var(--border);
  background:var(--bg-panel);
  padding:14px 18px;
  min-width:0;
  transition:border-color .15s linear;
}
.post-nav a:hover{ border-color:var(--dash); }
.post-nav .pn-dir{
  display:block;
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.14em;
  color:var(--text-muted);
  margin-bottom:6px;
}
.post-nav .pn-title{
  font-size:13.5px;
  font-weight:700;
  line-height:1.5;
}
.post-nav a.next{ text-align:right; }
@media (max-width:640px){ .post-nav{ grid-template-columns:1fr; } }

/* ---------- 裸表防御:文章正文里未套 .table-wrap 的表 ---------- */
.prose > .data-table{
  display:block;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  max-width:100%;
  min-width:0;
}

/* ---------- dl-fab 右下角常驻下载浮层(仅博客文章页使用) ---------- */
.dl-fab{
  position:fixed;
  right:18px; bottom:18px;
  z-index:50;
  display:inline-flex; align-items:center; gap:9px;
  background:var(--accent);
  color:var(--bg);
  border:2px solid var(--bg);
  outline:1px solid var(--accent-dark);
  outline-offset:1px;
  padding:12px 18px;
  font-size:13px;
  font-weight:800;
  letter-spacing:.08em;
  transition:background .15s linear;
}
.dl-fab:hover{ background:var(--text); }
.dl-fab .ico{ width:15px; height:15px; }
@media (max-width:640px){
  .dl-fab{ right:12px; bottom:12px; padding:11px 14px; font-size:12px; }
}

/* ---------- 首页 Hero 装置元件(供 index / design-preview 复用) ---------- */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  overflow:hidden;
  background:linear-gradient(180deg,var(--bg) 0%,var(--bg-deep) 100%);
}
.hero .stage{
  position:relative;
  width:100%;
  max-width:1440px;
  height:900px;
  min-height:100vh;
  min-height:100svh;
  margin-inline:auto;
}
.hero-svg{ position:absolute; inset:0; width:100%; height:100%; display:block; }
.trunk-halo{
  fill:none; stroke:var(--accent); stroke-width:10; opacity:.22;
  stroke-linejoin:bevel;
}
.trunk-core{
  fill:none; stroke:var(--bolt-core); stroke-width:5.5;
  stroke-linejoin:bevel;
}
.branch{
  fill:none; stroke:var(--bolt-branch); stroke-width:2.5; opacity:.85;
  stroke-linejoin:bevel;
}
.node-dot{ fill:var(--bolt-core); opacity:.9; }
.spark{ fill:none; stroke:var(--bolt-core); stroke-width:2; opacity:.75; }
.pin{ fill:var(--bg); stroke:var(--bolt-branch); stroke-width:1.5; }

.placard{
  position:absolute; left:120px; top:88px;
  width:400px;
  max-width:calc(100% - 32px);
  background:var(--bg-panel);
  border:1px dashed var(--dash);
  padding:16px 18px 18px;
}
.placard-tag{
  display:flex; align-items:center; gap:8px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--text-muted);
}
.placard-tag i{ width:6px; height:6px; background:var(--accent); flex:none; }
.placard h1{
  margin-top:10px;
  font-family:var(--font-display);
  font-size:21px;
  font-weight:800;
  line-height:1.5;
  letter-spacing:.02em;
}
.placard h1 strong{ color:var(--accent); font-weight:800; }
.placard-desc{
  margin-top:8px;
  font-size:12.5px;
  line-height:1.8;
  color:var(--text-muted);
}
.placard-desc strong{ color:var(--text); font-weight:600; }
.placard-meta{
  margin-top:12px;
  padding-top:10px;
  border-top:1px dashed var(--dash-soft);
  display:flex; gap:16px; flex-wrap:wrap;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--text-muted);
}
.placard-meta b{ color:var(--accent); font-weight:500; }

.spec-col{
  position:absolute; right:40px; top:96px;
  display:flex; flex-direction:column; gap:8px; align-items:flex-end;
}
.spec-row{
  display:flex; align-items:center; gap:9px;
  background:var(--panel-glass);
  border:1px dashed var(--dash-soft);
  padding:7px 11px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--text-muted);
}
.spec-row i{ width:6px; height:6px; background:var(--accent); flex:none; }
.spec-row b{ color:var(--text); font-weight:500; }

.plates{ position:absolute; inset:0; }
.plate{ position:absolute; transform:translateX(-50%); }
.plate-win{ left:33.6%; top:430px; }
.plate-mac{ left:43.9%; top:450px; }
.plate-lin{ left:50%; top:483px; }
.plate-and{ left:56.1%; top:450px; }
.plate-ios{ left:66.4%; top:430px; }
.plate a{
  display:flex; align-items:center; gap:9px;
  background:var(--accent);
  color:var(--bg);
  border:2px solid var(--bg);
  outline:1px solid var(--accent-dark);
  outline-offset:1px;
  padding:8px 14px;
  font-size:13px; font-weight:800; letter-spacing:.08em;
  white-space:nowrap;
  transition:background .15s linear;
}
.plate a:hover{ background:var(--text); }
.plate code{
  font-size:9.5px; font-weight:700; letter-spacing:.12em;
  padding-right:8px;
  border-right:1px solid var(--plate-line);
}

.hero-copy{
  position:absolute; left:0; right:0; top:584px;
  text-align:center;
  padding-inline:var(--gutter);
}
.hero-title{
  font-family:var(--font-display);
  font-size:clamp(72px,12.2vw,176px);
  font-weight:900;
  font-style:italic;
  line-height:.9;
  letter-spacing:.02em;
  color:var(--text);
  transform:scaleY(1.06);
  user-select:none;
}
.hero-cta{
  margin-top:18px;
  display:flex; align-items:center; justify-content:center; gap:14px; flex-wrap:wrap;
}
.hero-chips{
  margin-top:12px;
  display:flex; justify-content:center; flex-wrap:wrap; gap:8px;
}

.peek{
  position:absolute; left:0; right:0; bottom:0;
  border-top:1px dashed var(--dash);
  background:var(--peek-bg);
}
.peek-inner{
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
  padding:8px var(--gutter) 10px;
  font-family:var(--font-mono);
  font-size:10px; letter-spacing:.16em;
  color:var(--text-muted);
}
.peek-tag{
  background:var(--accent); color:var(--bg);
  font-weight:700;
  padding:2px 7px;
  flex:none;
}
.peek-codes{ margin-left:auto; }
.peek-codes b{ color:var(--text); font-weight:500; }
.peek .ico{ color:var(--accent); }

@keyframes core-in{
  0%{opacity:0;} 6%{opacity:1;} 12%{opacity:.3;} 20%{opacity:1;} 100%{opacity:1;}
}
@keyframes halo-in{
  0%{opacity:0;} 10%{opacity:.55;} 18%{opacity:.1;} 30%{opacity:.4;} 45%{opacity:.22;} 100%{opacity:.22;}
}
@keyframes branch-in{
  from{opacity:0;} to{opacity:.85;}
}
.trunk-core{ animation:core-in 1.2s linear both; }
.trunk-halo{ animation:halo-in 1.2s linear both; }
.branch{ animation:branch-in .5s linear .5s both; }
.spark{ animation:core-in 1.2s linear both; }
.node-dot{ animation:core-in 1.2s linear both; }
.pin{ animation:branch-in .5s linear .5s both; }
@media (prefers-reduced-motion:reduce){
  .trunk-core,.trunk-halo,.branch,.spark,.node-dot,.pin{ animation:none; }
}
@media (max-width:900px){
  .spec-col{ display:none; }
  .placard{ left:var(--gutter); top:76px; width:min(400px,calc(100% - 2 * var(--gutter))); }
  .plate-win{ left:14%; top:400px; }
  .plate-mac{ left:36%; top:424px; }
  .plate-lin{ left:56%; top:448px; }
  .plate-and{ left:76%; top:424px; }
  .plate-ios{ left:50%; top:492px; }
  .hero-copy{ top:auto; bottom:88px; }
}
@media (max-width:640px){
  .plate a{ padding:6px 9px; font-size:11px; gap:6px; }
  .plate code{ font-size:8.5px; padding-right:6px; }
  .placard{ top:72px; }
  .hero-title{ font-size:clamp(56px,18vw,96px); }
  .peek-codes{ display:none; }
}