*,
*::before,
*::after{box-sizing:border-box;margin:0;padding:0}

html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:#f3f4f6;
  color:#0f172a;
  line-height:1.8;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

.wrap{width:100%;max-width:1140px;margin:0 auto;padding:0 16px}

/* 顶部：横向信息条 + 导航 */
.topbar{
  background:#ffffff;
  border-bottom:1px solid rgba(15,23,42,.06);
  box-shadow:0 10px 30px rgba(15,23,42,.04);
  position:sticky;top:0;z-index:20;
}
.topbar__inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:8px 0;
}
.brand{
  display:flex;align-items:center;gap:10px;
}
.brand__mark{
  width:32px;height:32px;border-radius:11px;
  background:linear-gradient(135deg,#0ea5e9,#22c55e);
  padding:2px;
}
.brand__mark span{
  width:100%;height:100%;border-radius:9px;
  background:#ffffff;color:#0f766e;
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:900;font-size:16px;
}
.brand__name{display:flex;flex-direction:column;line-height:1.1}
.brand__name strong{font-size:15px}
.brand__name small{font-size:12px;color:#6b7280;font-weight:600}

.topbar__meta{
  font-size:11px;color:#9ca3af;
  display:flex;flex-direction:column;gap:2px;
}

.nav{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.nav a{
  font-size:12px;font-weight:700;
  padding:6px 10px;border-radius:999px;
  border:1px solid transparent;
  color:#4b5563;
  transition:background .18s,border-color .18s,color .18s,transform .18s;
}
.nav a:hover{
  background:rgba(14,165,233,.08);
  border-color:rgba(148,163,184,.7);
}
.nav a.active{
  background:#0f766e;
  border-color:#0f766e;
  color:#ecfeff;
}

.topbar__cta{
  display:inline-flex;align-items:center;justify-content:center;
  padding:7px 12px;border-radius:999px;
  background:#0f766e;color:#ecfeff;
  font-size:12px;font-weight:800;
  box-shadow:0 12px 28px rgba(15,118,110,.4);
}
.topbar__cta:hover{transform:translateY(-1px);filter:saturate(1.05)}

main{flex:1;}

/* Hero：左列“说明栏” + 右列“内容时间轴” */
.hero{
  padding:24px 0 18px;
}
.hero__grid{
  display:grid;
  grid-template-columns:minmax(0,0.95fr) minmax(0,1.4fr);
  gap:18px;
}

.hero__side{
  background:#ffffff;
  border-radius:18px;
  border:1px solid rgba(15,23,42,.06);
  box-shadow:0 12px 30px rgba(15,23,42,.06);
  padding:14px 14px 12px;
  position:relative;
}
.hero__tag{
  font-size:11px;color:#0369a1;
  text-transform:uppercase;
  letter-spacing:.08em;
  margin-bottom:6px;
}
.hero__side h1{
  font-size:24px;line-height:1.35;margin-bottom:8px;
}
.hero__side p{
  font-size:13px;color:#4b5563;
}
.hero__chips{
  margin-top:10px;
  display:flex;flex-wrap:wrap;gap:8px;
  font-size:11px;
}
.chip{
  padding:4px 8px;border-radius:999px;
  background:#eff6ff;
  color:#1d4ed8;
}

.hero__main{
  background:#020617;
  border-radius:20px;
  border:1px solid rgba(15,23,42,.12);
  box-shadow:0 22px 60px rgba(15,23,42,.45);
  padding:14px 16px 14px;
  position:relative;
  overflow:hidden;
}
.hero__main::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(700px 320px at 0 0,rgba(56,189,248,.28),transparent),
    radial-gradient(700px 320px at 100% 0,rgba(34,197,94,.26),transparent);
  opacity:.9;pointer-events:none;
}
.hero__track{
  position:relative;z-index:1;
  display:grid;
  grid-template-columns:24px minmax(0,1fr);
  column-gap:16px;
}
.hero__line{
  position:relative;
}
.hero__line::before{
  content:"";position:absolute;left:11px;top:0;bottom:0;
  width:2px;border-radius:999px;
  background:linear-gradient(180deg,rgba(56,189,248,.7),rgba(34,197,94,.7));
}
.hero__steps{
  display:flex;flex-direction:column;gap:12px;
}
.step{
  position:relative;
  background:rgba(15,23,42,.96);
  border-radius:14px;
  border:1px solid rgba(51,65,85,.9);
  padding:9px 10px 8px;
  font-size:12px;color:rgba(226,232,240,.96);
}
.step::before{
  content:"";position:absolute;left:-19px;top:10px;
  width:10px;height:10px;border-radius:999px;
  background:#0ea5e9;border:2px solid #020617;
  box-shadow:0 0 0 3px rgba(59,130,246,.45);
}
.step strong{display:block;font-size:13px;margin-bottom:2px;color:#e5e7eb}

.hero__actions{
  margin-top:10px;
  display:flex;flex-wrap:wrap;gap:10px;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:7px 13px;border-radius:999px;border:1px solid transparent;
  font-size:12px;font-weight:800;
  transition:background .18s,border-color .18s,color .18s,transform .18s,box-shadow .18s;
}
.btn--primary{
  background:linear-gradient(135deg,#0f766e,#0ea5e9);
  color:#ecfeff;
  box-shadow:0 14px 36px rgba(15,118,110,.5);
}
.btn--primary:hover{transform:translateY(-1px);filter:saturate(1.05)}
.btn--ghost{
  background:transparent;border-color:rgba(148,163,184,.8);color:#e5e7eb;
}
.btn--ghost:hover{border-color:#f9fafb}

/* 内容区：模块卡片 + FAQ */
.section{padding:18px 0}
.card{
  background:#ffffff;
  border-radius:20px;
  border:1px solid rgba(15,23,42,.06);
  box-shadow:0 12px 34px rgba(15,23,42,.06);
  padding:14px 16px 12px;
}
.card-head{
  display:flex;align-items:baseline;justify-content:space-between;
  gap:12px;flex-wrap:wrap;margin-bottom:10px;
}
.card-head h2{font-size:18px}
.card-head p{font-size:13px;color:#6b7280;max-width:640px}

.grid-3{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;
}
.pill{
  border-radius:16px;
  background:linear-gradient(135deg,rgba(14,165,233,.08),rgba(34,197,94,.08));
  border:1px solid rgba(148,163,184,.7);
  padding:10px 10px 9px;
  font-size:12px;color:#374151;
}
.pill strong{display:block;font-size:13px;margin-bottom:3px}

.grid-4{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;
}

.faq-grid{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;
  margin-top:6px;
}
.faq-grid details{
  border-radius:16px;
  background:#f9fafb;
  border:1px solid rgba(148,163,184,.7);
  padding:8px 10px;
  font-size:12px;color:#374151;
}
.faq-grid summary{cursor:pointer;font-weight:700}
.faq-grid summary::-webkit-details-marker{display:none}
.faq-grid p{margin-top:6px}

/* 页脚 */
.footer{
  margin-top:22px;
  background:#020617;
  border-top:1px solid rgba(15,23,42,.5);
  color:rgba(248,250,252,.9);
}
.footer__grid{
  display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,.9fr) minmax(0,.9fr);
  gap:12px;padding:16px 0 10px;
  font-size:13px;color:rgba(209,213,219,.9);
}
.footer h4{font-size:14px;margin-bottom:6px;color:rgba(248,250,252,.96)}
.footer a{display:block;padding:3px 0;color:rgba(209,213,219,.9)}
.footer a:hover{color:#ffffff;text-decoration:underline}
.footer__bottom{
  border-top:1px solid rgba(15,23,42,.5);
  padding:8px 0 10px;
  font-size:12px;color:rgba(148,163,184,.9);
}

@media (max-width: 960px){
  .topbar__inner{flex-wrap:wrap}
  .topbar__meta{display:none}
  .hero__grid{grid-template-columns:1fr}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .faq-grid{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr 1fr}
}
@media (max-width: 640px){
  .hero__side h1{font-size:22px}
  .grid-3{grid-template-columns:1fr}
  .grid-4{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr}
}