/* ===== 出海SEO 栏目：沿用主站 v2.css 的颜色变量，只作用于 .cs / .cs-head 内部 ===== */
html{scroll-behavior:smooth;scroll-padding-top:84px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.cs,.cs-head{--gb:var(--blue,#2563eb);--gbs:rgba(37,99,235,.08);--t1c:var(--t1,#0f172a);--t2c:var(--t2,#475569);--t3c:var(--t3,#94a3b8);--bdc:var(--bd,#e2e8f0);--wc:var(--white,#fff);--soft:#f8fafc;--grn:#10b981;--amb:#f59e0b;--pur:#8b5cf6}
.cs *:not(.w),.cs-head *:not(.w){box-sizing:border-box}
.cs{color:var(--t1c);font-size:15px;line-height:1.8}
.cs h2,.cs h3,.cs h4{color:var(--t1c);margin:0;line-height:1.4;font-weight:800;letter-spacing:0}
.cs a{color:var(--gb)}

/* 面包屑 */
.cs-crumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0 0 14px;font-size:13px;color:var(--t3c)}
.cs-crumb li+li::before{content:"/";margin-right:6px;opacity:.6}
.cs-crumb a{color:inherit;text-decoration:none}
.cs-crumb a:hover{color:var(--gb)}
.cs > .w > .cs-crumb{padding-top:28px}

/* 栏目首页：右侧路线卡（在主站 .hero 里） */
.cs-route{background:var(--wc);border:1px solid var(--bdc);border-radius:14px;padding:22px;box-shadow:0 20px 50px -20px rgba(10,14,26,.35);color:var(--t1c)}
.cs-route h4{font-size:15px;margin:0 0 12px}
.cs-route ol{list-style:none;margin:0;padding:0;counter-reset:r}
.cs-route li{counter-increment:r}
.cs-route li a{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:10px;text-decoration:none;color:var(--t1c);transition:.2s}
.cs-route li a::before{content:counter(r);display:grid;place-items:center;width:26px;height:26px;border-radius:7px;background:var(--gbs);color:var(--gb);font-weight:800;font-size:13px;flex:none}
.cs-route li a:hover{background:var(--soft)}
.cs-route li a:hover::before{background:var(--gb);color:#fff}
.cs-route b{flex:1;font-size:14.5px}
.cs-route span{font-size:12px;color:var(--t3c)}
.cs-route p{margin:14px 0 0;padding-top:12px;border-top:1px solid var(--bdc);font-size:13px;color:var(--t2c)}

/* 栏目首页：分阶段文章 */
.cs-stage{padding:28px 0 12px}
.cs-stage-hd{display:flex;gap:14px;align-items:flex-start;margin-bottom:16px}
.cs-stage-hd .n{font-size:40px;font-weight:900;line-height:1;color:var(--gb);opacity:.18}
.cs-stage-hd h2{font-size:22px}
.cs-stage-hd p{margin:2px 0 0;color:var(--t2c);font-size:14px}
.cs-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.cs .cs-card{display:flex;flex-direction:column;gap:8px;padding:18px 20px;background:var(--wc);border:1px solid var(--bdc);border-radius:12px;text-decoration:none;color:var(--t1c);transition:border-color .2s,box-shadow .2s,transform .2s}
.cs-card:hover{border-color:var(--gb);box-shadow:0 4px 16px rgba(37,99,235,.08);transform:translateY(-1px)}
.cs-card b{font-size:16px;line-height:1.5}
.cs-card p{margin:0;font-size:13.5px;color:var(--t2c);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.cs-card .go{margin-top:auto;font-size:13px;font-weight:700;color:var(--gb)}
.cs-cta{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin:36px 0 64px;padding:24px 28px;border-radius:14px;background:linear-gradient(135deg,rgba(37,99,235,.08),rgba(139,92,246,.07));border:1px solid rgba(37,99,235,.18)}
.cs-cta b{font-size:18px;font-weight:800}
.cs-cta p{margin:4px 0 0;color:var(--t2c);font-size:14px}
.cs-cta .acts{display:flex;gap:10px;flex-wrap:wrap}
.cs-btn{display:inline-flex;align-items:center;padding:10px 18px;border-radius:8px;font-weight:700;font-size:14px;text-decoration:none;border:1px solid var(--bdc);background:var(--wc);color:var(--t1c)!important;transition:.2s}
.cs-btn:hover{border-color:var(--gb);color:var(--gb)!important}
.cs-btn.pri{background:var(--gb);border-color:var(--gb);color:#fff!important}
.cs-btn.pri:hover{box-shadow:0 4px 14px rgba(37,99,235,.28)}

/* 文章页：深色标题区，呼应主站首屏 */
.cs-head{background:linear-gradient(180deg,#0a0e1a,#111a2e);color:#fff;padding:104px 0 40px}
.cs-head .cs-crumb ol{color:rgba(255,255,255,.5)}
.cs-head .cs-crumb a:hover{color:#fff}
.cs-group{display:inline-block;font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:rgba(37,99,235,.25);color:#93b4ff;margin-bottom:12px}
.cs-head h1{color:#fff;font-size:clamp(24px,3.4vw,36px);line-height:1.35;font-weight:800;margin:0 0 14px;max-width:820px}
.cs-by{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:13px;color:rgba(255,255,255,.55);margin:0}

/* 文章页布局 */
.cs-page{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:40px;padding-top:32px;padding-bottom:64px;align-items:start}
.cs-art{min-width:0;max-width:780px}
.cs-answer{background:var(--wc);border:1px solid var(--bdc);border-left:4px solid var(--gb);border-radius:0 12px 12px 0;padding:16px 20px;margin-bottom:28px;box-shadow:0 1px 3px rgba(10,14,26,.04)}
.cs-answer b{display:block;font-size:13px;color:var(--gb);margin-bottom:4px}
.cs-answer p{margin:0;font-size:15.5px;line-height:1.8;color:var(--t1c)}

/* 正文排版 */
.cs-prose{font-size:16px;line-height:1.9;color:var(--t1c)}
.cs-prose h2{font-size:22px;margin:40px 0 14px;padding-left:12px;border-left:4px solid var(--gb);line-height:1.4}
.cs-prose h3{font-size:18px;margin:28px 0 10px}
.cs-prose p{margin:0 0 16px}
.cs-prose ul,.cs-prose ol{margin:0 0 16px;padding-left:22px}
.cs-prose li{margin-bottom:6px}
.cs-prose strong{color:var(--t1c);background:linear-gradient(transparent 62%,rgba(37,99,235,.14) 62%)}
.cs-prose a{text-underline-offset:3px}
.cs-prose blockquote{margin:0 0 16px;padding:12px 18px;background:var(--soft);border-left:3px solid var(--bdc);color:var(--t2c)}
.cs-prose code{background:var(--soft);padding:1px 6px;border-radius:4px;font-size:.92em}
.cs-prose .tw{overflow-x:auto;margin:0 0 20px;border:1px solid var(--bdc);border-radius:10px;background:var(--wc)}
.cs-prose table{border-collapse:collapse;width:100%;min-width:520px;font-size:14.5px;line-height:1.7}
.cs-prose th,.cs-prose td{padding:11px 14px;border-bottom:1px solid var(--bdc);text-align:left;vertical-align:top}
.cs-prose thead th{background:var(--soft);font-weight:800}
.cs-prose tr:last-child td{border-bottom:0}
.cs-prose .note{margin:0 0 18px;padding:12px 16px;border-radius:10px;background:rgba(245,158,11,.08);border:1px solid rgba(245,158,11,.25);font-size:14.5px;color:#92400e}
.cs-prose .note::before{content:"提醒　";font-weight:800}
.cs-prose pre.prompt{white-space:pre-wrap;margin:0 0 18px;padding:14px 16px;border-radius:10px;background:#0f172a;color:#e2e8f0;font:inherit;font-size:14px;line-height:1.8;position:relative}
.cs-prose pre.prompt::before{content:"AI 指令";display:block;font-size:11.5px;font-weight:700;color:#93b4ff;margin-bottom:6px}
.cs-prose .todo{margin:0 0 18px;padding:12px 16px;border:2px dashed #f59e0b;border-radius:10px;background:#fffbeb;color:#92400e;font-size:14px}
.cs-prose .todo::before{content:"待补充　";font-weight:800}

/* FAQ */
.cs-faq{margin-top:40px}
.cs-faq details{background:var(--wc);border:1px solid var(--bdc);border-radius:12px;margin-bottom:10px;transition:border-color .2s}
.cs-faq details[open]{border-color:rgba(37,99,235,.35)}
.cs-faq summary{cursor:pointer;padding:14px 18px;font-weight:700;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;gap:12px}
.cs-faq summary::-webkit-details-marker{display:none}
.cs-faq summary::after{content:"+";color:var(--gb);font-size:20px;line-height:1}
.cs-faq details[open] summary::after{content:"−"}
.cs-faq details > div{padding:0 18px 14px;font-size:15px;color:var(--t2c)}
.cs-faq details > div p:last-child{margin:0}
.cs-cross{margin-top:28px;padding:16px 20px;border-radius:12px;background:var(--gbs);border:1px solid rgba(37,99,235,.18)}
.cs-cross b{font-size:15px}
.cs-cross p{margin:4px 0 0;font-size:14.5px;color:var(--t2c)}

/* 作者、上下篇 */
.cs-author{display:flex;gap:14px;align-items:center;margin-top:36px;padding:16px 20px;background:var(--wc);border:1px solid var(--bdc);border-radius:12px}
.cs-author .av{flex:none;width:46px;height:46px;border-radius:12px;background:var(--gb);color:#fff;display:grid;place-items:center;font-weight:900;font-size:18px}
.cs-author b{font-size:15px}
.cs-author p{margin:2px 0 0;font-size:13.5px;color:var(--t2c)}
.cs-pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}
.cs-pn a{display:block;padding:14px 18px;background:var(--wc);border:1px solid var(--bdc);border-radius:12px;text-decoration:none;color:var(--t1c);font-weight:700;font-size:15px;transition:.2s}
.cs-pn a:hover{border-color:var(--gb);color:var(--gb)}
.cs-pn small{display:block;font-size:12px;font-weight:400;color:var(--t3c)}
.cs-pn .next{text-align:right}

/* 侧栏 */
.cs-side{position:sticky;top:84px;display:flex;flex-direction:column;gap:12px;max-height:calc(100vh - 100px);overflow:auto}
.cs-side .box{background:var(--wc);border:1px solid var(--bdc);border-radius:12px;padding:16px}
.cs-side .box > b{display:block;font-size:13px;color:var(--t3c);margin-bottom:8px}
.cs-side ol,.cs-side ul{list-style:none;margin:0;padding:0}
.cs-side li a{display:block;padding:5px 0 5px 10px;border-left:2px solid var(--bdc);font-size:13.5px;line-height:1.5;color:var(--t2c);text-decoration:none}
.cs-side li a:hover{color:var(--gb);border-left-color:var(--gb)}
.cs-side .tools a{display:flex;justify-content:space-between;align-items:center;padding:8px 10px;margin-top:6px;border-radius:8px;background:var(--soft);font-size:13.5px;font-weight:600;color:var(--t1c);text-decoration:none}
.cs-side .tools a::after{content:"→";color:var(--gb)}
.cs-side .tools a:hover{background:var(--gbs);color:var(--gb)}

@media (max-width:980px){
  .cs-page{grid-template-columns:1fr}
  .cs-side{position:static;max-height:none;order:-1}
  .cs-side .box{display:none}
  .cs-side .box:first-child{display:block}
}
@media (max-width:640px){
  .cs-head{padding:88px 0 28px}
  .cs-prose{font-size:15.5px}
  .cs-prose h2{font-size:19px}
  .cs-pn{grid-template-columns:1fr}
  .cs-pn .next{text-align:left}
  .cs-cta{padding:20px}
  .cs-grid{grid-template-columns:1fr}
}