/* 选址客 xuanzhike.com — 共享样式
   设计取向：黑白主色、语义清晰、响应式（移动优先）
   对人是朴素的，对 AI 是清晰的 */

:root{
  --ink:#111;
  --ink-2:#3a3a3a;
  --muted:#6b6b6b;
  --line:#e6e6e6;
  --bg:#ffffff;
  --soft:#f7f7f7;
  --max:860px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto}
a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line);transition:border-color .15s}
a:hover{border-color:var(--ink)}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}

.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
header.site{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.site-inner{
  max-width:var(--max);margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;justify-content:space-between;
  gap:10px 18px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:10px;border:none}
.brand:hover{border:none}
.brand-mark{height:30px;width:auto;display:block;flex:none}
/* 品牌锁定：中英两行左右等宽。中文名逐字撑满，宽度由较宽的那一行决定 */
.brand-text{display:flex;flex-direction:column;align-items:stretch;width:max-content;line-height:1.15}
.brand-name{display:flex;justify-content:space-between;width:100%;
  font-weight:700;font-size:17px;line-height:1.15;letter-spacing:0;white-space:nowrap}
.brand-name i{font-style:normal}
.brand-sub{font-weight:400;font-size:9.5px;color:var(--muted);letter-spacing:0;white-space:nowrap}
/* 英文页：首行全大写品牌名不拉伸，第二行中文名左对齐 */
html[lang="en"] .brand-name{display:block;width:auto}
html[lang="en"] .brand-sub{font-size:11px;letter-spacing:.16em}
nav.main{display:flex;gap:6px 18px;flex-wrap:wrap}
nav.main a{font-size:14px;color:var(--muted);border:none;padding:2px 0}
nav.main a:hover{color:var(--ink)}
nav.main a[aria-current="page"]{color:var(--ink);font-weight:600}
.site-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.lang{font-size:12.5px;color:var(--muted);border:1px solid var(--line);border-radius:2px;padding:2px 9px;line-height:1.5;letter-spacing:.04em}
.lang:hover{color:var(--ink);border-color:var(--ink)}

/* ---------- 移动端折叠菜单（纯 CSS，无需 JS） ---------- */
.nav-toggle{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.nav-btn{display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;padding:0;border:none;background:none;cursor:pointer;flex:none}
.nav-btn span{display:block;width:26px;height:2px;background:var(--ink);border-radius:1px;transition:transform .2s ease,opacity .2s ease}
.nav-btn:hover span{opacity:.65}
@media(max-width:767px){
  .nav-btn{display:flex}
  .site-right{display:none;flex-basis:100%;flex-direction:column;align-items:stretch;gap:0;margin-top:8px}
  .nav-toggle:checked ~ .site-right{display:flex}
  .nav-toggle:checked ~ .nav-btn span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle:checked ~ .nav-btn span:nth-child(2){opacity:0}
  .nav-toggle:checked ~ .nav-btn span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .site-right nav.main{flex-direction:column;gap:0;width:100%}
  .site-right nav.main a{padding:13px 0;border-top:1px solid var(--line);font-size:15px;color:var(--ink-2)}
  .site-right nav.main a[aria-current="page"]{color:var(--ink)}
  .site-right .lang{align-self:flex-start;margin:14px 0 2px;padding:6px 16px}
}
html[lang="en"] body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif}

/* ---------- Hero ---------- */
.hero{padding:56px 0 40px;border-bottom:1px solid var(--line)}
.hero .eyebrow{font-size:12px;letter-spacing:.2em;color:var(--muted);text-transform:uppercase;margin:0 0 14px}
.hero h1{font-size:34px;line-height:1.3;margin:0 0 16px;letter-spacing:.01em}
.hero .lead{font-size:17px;color:var(--ink-2);margin:0 0 8px;max-width:640px}
.hero .slogan{font-size:15px;color:var(--muted);margin:16px 0 0}
.hero .actions{margin-top:26px;display:flex;gap:12px;flex-wrap:wrap}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;padding:11px 20px;border:1px solid var(--ink);
  font-size:14px;border-radius:2px;line-height:1.2;
}
.btn.solid{background:var(--ink);color:#fff}
.btn.solid:hover{border-color:var(--ink);opacity:.88}
.btn.ghost{color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff}

/* ---------- Sections ---------- */
main{display:block}
section.block{padding:44px 0;border-bottom:1px solid var(--line)}
section.block:last-of-type{border-bottom:none}
h2{font-size:22px;margin:0 0 18px;letter-spacing:.01em}
h3{font-size:17px;margin:26px 0 8px}
p{margin:0 0 14px}
.muted{color:var(--muted)}

/* ---------- Cards ---------- */
.grid{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:640px){.grid.cols-3{grid-template-columns:repeat(3,1fr)}.grid.cols-2{grid-template-columns:repeat(2,1fr)}}
.card{border:1px solid var(--line);border-radius:3px;padding:20px;background:var(--soft)}
.card h3{margin:0 0 8px;font-size:16px}
.card p{margin:0;font-size:14px;color:var(--ink-2)}

/* ---------- Definition list ---------- */
dl.facts{margin:0;display:grid;grid-template-columns:1fr;gap:0;border-top:1px solid var(--line)}
@media(min-width:640px){dl.facts{grid-template-columns:200px 1fr}}
dl.facts dt,dl.facts dd{margin:0;padding:12px 0;border-bottom:1px solid var(--line)}
dl.facts dt{color:var(--muted);font-size:14px}
dl.facts dd{font-size:15px}

/* ---------- FAQ ---------- */
.faq-item{border-top:1px solid var(--line);padding:20px 0}
.faq-item:first-child{border-top:none}
.faq-item dt{font-weight:600;font-size:16px;margin:0 0 6px}
.faq-item dd{margin:0;color:var(--ink-2)}

/* ---------- Lists ---------- */
ul.clean{list-style:none;padding:0;margin:0 0 14px}
ul.clean li{padding-left:0;margin-bottom:8px}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);padding:36px 0 48px;color:var(--muted);font-size:13.5px}
footer.site .foot-inner{text-align:left}
footer.site .foot-brand{font-weight:700;font-size:16px;color:var(--ink);margin:0 0 6px}
footer.site .foot-tag{margin:0;font-size:13px}
footer.site .legal{margin:16px 0 0;font-size:12.5px;line-height:1.7}
footer.site .legal a{color:inherit;border-bottom:1px solid var(--line)}
footer.site .legal a:hover{color:var(--ink);border-color:var(--ink)}
footer.site .social{list-style:none;display:flex;flex-wrap:wrap;gap:10px 22px;margin:18px 0 0;padding:0}
footer.site .social a,footer.site .social label.soc-qr{display:inline-flex;align-items:center;gap:6px;color:var(--muted);border:none;font-size:12.5px}
footer.site .social a:hover,footer.site .social label.soc-qr:hover{color:var(--ink)}
footer.site .social label.soc-qr{cursor:pointer}
footer.site .social svg,footer.site .social label.soc-qr svg{width:17px;height:17px;flex:none}

/* ---------- Utility ---------- */
.notice{border-left:3px solid var(--ink);background:var(--soft);padding:12px 16px;font-size:14px;color:var(--ink-2);margin:0 0 16px}
.crumb{font-size:13px;color:var(--muted);padding:18px 0 0}
.crumb a{color:var(--muted)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;border:1px solid var(--ink)}

/* ---------- 公众号二维码弹层（纯 CSS 开关，与移动端菜单同一机制） ---------- */
.qr-toggle{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.qr-overlay{position:fixed;inset:0;z-index:60;display:none;align-items:center;justify-content:center;padding:24px}
.qr-toggle:checked ~ .qr-overlay{display:flex}
.qr-backdrop{position:absolute;inset:0;background:rgba(17,17,17,.55)}
.qr-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:3px;
  padding:26px 26px 20px;max-width:320px;text-align:center;box-shadow:0 14px 44px rgba(0,0,0,.2)}
.qr-img{display:block;width:234px;height:234px;margin:0 auto}
.qr-cap{margin:14px 0 0;font-size:13.5px;font-weight:600;line-height:1.6}
.qr-sub{margin:5px 0 0;font-size:12px;color:var(--muted)}
.qr-close{position:absolute;top:0;right:2px;font-size:20px;line-height:1;color:var(--muted);
  cursor:pointer;padding:9px 12px;border-radius:3px}
.qr-close:hover{color:var(--ink)}

@media(max-width:520px){
  .hero h1{font-size:27px}
  .hero{padding:40px 0 32px}
  section.block{padding:34px 0}
  .qr-card{padding:20px 20px 16px;max-width:290px}
  .qr-img{width:200px;height:200px}
}