:root{
  --ink:#181d2a;
  --ink-2:#4a5366;
  --ink-3:#7a8295;
  --line:#e6e8ef;
  --line-2:#eef0f5;
  --bg:#ffffff;
  --bg-soft:#f7f8fb;
  --teal:#3f8a85;
  --teal-soft:#e7f1f0;
  --purple:#8479c0;
  --purple-soft:#efecf8;
  --blue:#6b8fd4;
  --grad:linear-gradient(110deg,#4a8a87 0%,#6b86c2 48%,#9384c8 100%);
  --grad-soft:linear-gradient(135deg,#e9f2f1 0%,#eef0f9 55%,#f1ecf8 100%);
  --shadow-sm:0 8px 24px rgba(24,29,42,.07);
  --shadow-md:0 16px 42px rgba(24,29,42,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.82);-webkit-backdrop-filter:blur(18px) saturate(150%);backdrop-filter:blur(18px) saturate(150%);border-bottom:1px solid rgba(230,232,239,.8)}
.nav{height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:12px;font-weight:800;color:var(--ink)}
.logo-img{height:34px;width:auto;display:block}
.logo-img.foot{height:48px;width:auto}
.brand-name{font-size:19px;line-height:1;letter-spacing:0}
.nav-links{display:flex;align-items:center;gap:28px;font-size:14.5px;font-weight:500;color:var(--ink-2)}
.nav-links a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:999px;font-weight:700;line-height:1;transition:transform .2s,box-shadow .2s,border-color .2s,color .2s}
.btn:hover{transform:translateY(-2px)}
.btn-grad,.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(96,108,180,.30)}
.btn-white{background:#fff;color:var(--ink);box-shadow:0 8px 22px rgba(24,29,42,.12)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.hero{padding:72px 0 38px}
.crumbs{font-size:13px;color:var(--ink-3);margin-bottom:18px}
.crumbs a{color:var(--ink-2)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:800;letter-spacing:.08em;color:var(--teal);margin-bottom:18px}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--teal);display:inline-block}
h1{font-size:clamp(34px,5vw,58px);line-height:1.08;margin:0 0 18px;letter-spacing:0;max-width:900px}
h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{font-size:18px;color:var(--ink-2);max-width:790px;margin:0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.grid{display:grid;grid-template-columns:minmax(0,1fr) 292px;gap:30px;align-items:start}
.article,.toc,.card,.related,.faq details{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-sm)}
.article{padding:36px}
.article h2{font-size:28px;line-height:1.25;margin:36px 0 12px;letter-spacing:0}
.article h2:first-child{margin-top:0}
.article h3{font-size:19px;margin:24px 0 8px}
.article p{margin:10px 0;color:var(--ink-2)}
.article ul,.article ol{padding-left:22px;color:var(--ink-2)}
.article li{margin:8px 0}
.toc{position:sticky;top:96px;padding:22px}
.toc strong,.related strong{display:block;margin-bottom:12px;color:var(--ink)}
.toc a,.related a{display:block;color:var(--ink-2);font-size:14px;padding:9px 0;border-top:1px solid var(--line-2)}
.toc a:first-of-type,.related a:first-of-type{border-top:0}
.toc a:hover,.related a:hover{color:var(--teal)}
.callout{margin:24px 0;padding:18px 20px;border:1px solid rgba(63,138,133,.22);border-radius:14px;background:linear-gradient(180deg,#fff,var(--teal-soft));color:var(--ink-2)}
.steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:20px 0}
.card{padding:20px;box-shadow:none;background:linear-gradient(180deg,#fff,var(--bg-soft))}
.card b{display:block;margin-bottom:6px;color:var(--ink)}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px;margin:18px 0}
table{width:100%;border-collapse:collapse;background:#fff;min-width:620px}
th,td{padding:14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--bg-soft)}
tr:last-child td{border-bottom:0}
.faq{margin-top:34px}
.faq details{padding:16px 18px;margin:12px 0;box-shadow:none}
.faq summary{font-weight:750;cursor:pointer;color:var(--ink)}
.faq p{margin:10px 0 0}
.related{margin-top:24px;padding:22px;box-shadow:none}
.cta{margin:42px 0 10px;padding:38px;border-radius:22px;background:var(--grad);color:#fff;text-align:left;box-shadow:var(--shadow-md)}
.cta h2{margin:0 0 10px;color:#fff}
.cta p{color:rgba(255,255,255,.88);margin:0 0 22px}
footer{margin-top:70px;border-top:1px solid var(--line);background:var(--bg-soft);padding:48px 0 28px}
.foot-top{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.8fr);gap:44px;align-items:start}
.foot-brand p{font-size:13.5px;color:var(--ink-3);margin:16px 0 0;max-width:350px;line-height:1.7}
.foot-social{display:flex;flex-wrap:nowrap;align-items:center;gap:0 24px;margin-top:18px}
.soc{display:flex;align-items:center;gap:9px;font-size:13.5px;color:var(--ink-2);white-space:nowrap}
.soc svg{width:18px;height:18px;color:var(--teal);flex-shrink:0}
.soc-ic{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}
.soc-badge{display:inline-flex;align-items:center;justify-content:center;background:#ff2442;color:#fff;font-size:11px;font-weight:800;padding:3px 6px;border-radius:6px;line-height:1;flex-shrink:0}
.foot-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.foot-col h4{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink);margin:0 0 14px}
.foot-col a,.foot-col span{display:block;font-size:14px;color:var(--ink-2);margin-bottom:10px;transition:color .15s}
.foot-col a:hover{color:var(--ink)}
.foot-qr{display:block;width:120px;height:120px;border-radius:10px;border:1px solid var(--line);background:#fff;padding:6px;box-shadow:var(--shadow-sm);object-fit:cover}
.foot-qr-cap{display:block;margin-top:9px;font-size:12px;color:var(--ink-3)}
.disclaimer{border-top:1px solid var(--line);margin-top:34px;padding-top:22px;font-size:11.5px;color:var(--ink-3);line-height:1.7}
.mobile-contact-bar{display:none;position:fixed;left:12px;right:12px;bottom:12px;z-index:90;background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(14px) saturate(150%);backdrop-filter:blur(14px) saturate(150%);border:1px solid var(--line);border-radius:16px;box-shadow:0 12px 34px rgba(24,29,42,.16);padding:10px;gap:10px}
.mobile-contact-bar a{flex:1;min-height:46px;border-radius:12px;font-size:14px;font-weight:800;display:flex;align-items:center;justify-content:center}
.mobile-contact-primary{background:#09bb5f;color:#fff}
.mobile-contact-secondary{background:var(--bg-soft);color:var(--ink)}
@media(max-width:900px){
  body{padding-bottom:78px}
  .nav{height:auto;padding:14px 0;align-items:flex-start}
  .nav-links{gap:14px;flex-wrap:wrap;justify-content:flex-end}
  .grid{grid-template-columns:1fr}
  .toc{position:static}
  .article{padding:26px 20px}
  .steps{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr;gap:30px}
  .mobile-contact-bar{display:flex}
}
@media(max-width:620px){
  .wrap{padding:0 16px}
  .hero{padding-top:48px}
  .nav-links a:not(.btn){display:none}
  .brand-name{font-size:18px}
  .btn{min-height:42px;padding:0 15px}
  .lede{font-size:16px}
  .article h2{font-size:23px}
  .foot-cols{grid-template-columns:1fr 1fr}
  .foot-contact{grid-column:1 / -1}
}
@media(max-width:440px){
  .foot-social{flex-wrap:wrap;gap:12px 22px}
}