:root{
  --purple:#6E62FF;
  --blue:#2BB8FF;
  --cyan:#2DE2E6;
  --ink:#111827;
  --ink-2:#374151;
  --ink-3:#6B7280;
  --bg:#F7F8FC;
  --paper:#FFFFFF;
  --soft:#EEF2FF;
  --line:#E5E7EB;
  --shadow:0 18px 50px 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:1080px;margin:0 auto;padding:0 22px}
header{position:sticky;top:0;z-index:20;background:rgba(247,248,252,.88);backdrop-filter:blur(16px) saturate(150%);border-bottom:1px solid rgba(229,231,235,.75)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.01em}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--purple),var(--blue));box-shadow:0 10px 24px rgba(110,98,255,.24)}
.nav-links{display:flex;align-items:center;gap:22px;font-size:14px;color:var(--ink-2)}
.nav-links a:hover{color:var(--purple)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:999px;font-weight:750}
.btn-primary{background:linear-gradient(135deg,var(--purple),var(--blue));color:#fff;box-shadow:0 14px 30px rgba(110,98,255,.24)}
.btn-white{background:#fff;color:var(--purple)}
.hero{padding:70px 0 34px}
.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;color:var(--purple);background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 13px}
h1{font-size:clamp(34px,5vw,58px);line-height:1.08;margin:22px 0 18px;letter-spacing:0}
h1 em{font-style:normal;background:linear-gradient(135deg,var(--purple),var(--blue));-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{font-size:18px;color:var(--ink-2);max-width:780px;margin:0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start}
.article,.toc,.card,.related,.faq details{background:var(--paper);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.article{padding:34px}
.article h2{font-size:28px;line-height:1.25;margin:34px 0 12px}
.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:92px;padding:22px}
.toc strong,.related strong{display:block;margin-bottom:12px}
.toc a,.related a{display:block;color:var(--ink-2);font-size:14px;padding:8px 0;border-top:1px solid var(--line)}
.toc a:first-of-type,.related a:first-of-type{border-top:0}
.callout{margin:22px 0;padding:18px 20px;border:1px solid rgba(110,98,255,.22);border-radius:14px;background:linear-gradient(180deg,#fff,#f7f7ff);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}
.card b{display:block;margin-bottom:6px}
.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:#F3F4F8}
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}
.faq p{margin:10px 0 0}
.related{margin-top:24px;padding:22px;box-shadow:none}
.cta{margin:42px 0 10px;padding:34px;border-radius:18px;background:linear-gradient(135deg,var(--purple),var(--blue));color:#fff}
.cta h2{margin:0 0 10px;color:#fff}
.cta p{color:rgba(255,255,255,.88);margin:0 0 20px}
footer{margin-top:54px;border-top:1px solid var(--line);padding:34px 0;color:var(--ink-3);font-size:13.5px}
.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.mobile-contact-bar{display:none;position:fixed;left:12px;right:12px;bottom:12px;z-index:90;background:rgba(255,255,255,.94);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(--soft);color:var(--ink)}
@media(max-width:860px){
  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:24px 20px}
  .steps{grid-template-columns:1fr}
  .mobile-contact-bar{display:flex}
}
@media(max-width:520px){
  .wrap{padding:0 16px}
  .hero{padding-top:46px}
  .nav-links a:not(.btn){display:none}
  .btn{min-height:42px;padding:0 15px}
  .lede{font-size:16px}
  .article h2{font-size:23px}
}