*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0a0f18;--panel:#111a28;--panel2:#16233a;--line:#22314a;
  --txt:#e8eef8;--dim:#8ba0bd;--accent:#3ddc97;--accent2:#4ea8ff;--warn:#ffb84d;
}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.65;overflow-x:hidden;
  -webkit-tap-highlight-color:transparent;
}
a{color:inherit;text-decoration:none}
.bg-grid{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(78,168,255,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(78,168,255,.055) 1px,transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(circle at 50% 0%,#000 16%,transparent 72%);
  -webkit-mask-image:radial-gradient(circle at 50% 0%,#000 16%,transparent 72%);
}
.bg-glow{
  position:fixed;left:50%;top:-260px;width:920px;height:640px;transform:translateX(-50%);
  z-index:0;pointer-events:none;
  background:radial-gradient(ellipse at center,rgba(61,220,151,.14),rgba(78,168,255,.08) 44%,transparent 70%);
  filter:blur(8px);
}
.bg-ring{
  position:absolute;right:-160px;top:120px;width:520px;height:520px;border-radius:50%;
  border:1px dashed rgba(78,168,255,.16);z-index:0;pointer-events:none;
}
.bg-ring::after{
  content:"";position:absolute;inset:70px;border-radius:50%;border:1px solid rgba(61,220,151,.1);
}
.wrap{position:relative;z-index:1;max-width:1120px;margin:0 auto;padding:0 18px}
/* 顶部导航 */
.nav{
  position:sticky;top:0;z-index:20;backdrop-filter:blur(12px);
  background:rgba(10,15,24,.84);border-bottom:1px solid var(--line);
}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:58px;max-width:1120px;margin:0 auto;padding:0 18px}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;letter-spacing:.5px}
.logo-dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}
.nav-links{display:flex;gap:6px}
.nav-links a{padding:7px 12px;border-radius:999px;font-size:14px;color:var(--dim);transition:.2s}
.nav-links a:hover{color:var(--txt);background:var(--panel2)}
.nav-links a.cta{color:#04121b;background:var(--accent);font-weight:700}
/* 首屏 */
.hero{
  display:grid;grid-template-columns:1.04fr .96fr;gap:42px;align-items:center;
  padding:54px 0 24px;
}
.hero-copy{position:relative;z-index:1}
.badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;
  border:1px solid rgba(61,220,151,.4);background:rgba(61,220,151,.09);
  color:var(--accent);font-size:12.5px;font-weight:600;margin-bottom:20px;letter-spacing:.3px;
}
.badge i{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.75)}}
h1{letter-spacing:-.4px}
.h1-top{
  display:block;font-size:clamp(14px,2.4vw,17px);font-weight:700;color:var(--dim);
  letter-spacing:3px;margin-bottom:10px;
}
.h1-main{display:block;font-size:clamp(28px,5.4vw,46px);line-height:1.22;font-weight:800}
.h1-main em{
  font-style:normal;background:linear-gradient(96deg,var(--accent),var(--accent2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.h1-tail{
  display:block;font-size:clamp(15px,2.8vw,20px);font-weight:600;
  color:rgba(232,238,248,.78);margin-top:12px;letter-spacing:1px;
}
.hero-copy p.sub{margin:16px 0 0;max-width:520px;color:var(--dim);font-size:clamp(14px,3.3vw,15.5px)}
.hero-points{display:flex;flex-wrap:wrap;gap:10px 18px;list-style:none;margin-top:18px}
.hero-points li{display:flex;align-items:center;gap:6px;font-size:13px;color:rgba(232,238,248,.82)}
.pt-ico{color:var(--accent);font-size:11px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:12px;font-weight:700;font-size:15px;transition:.22s;border:1px solid transparent}
.btn-main{background:linear-gradient(96deg,var(--accent),#2fc4a8);color:#04121b;box-shadow:0 10px 26px rgba(61,220,151,.24)}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(61,220,151,.34)}
.btn-ghost{border-color:var(--line);background:var(--panel);color:var(--txt)}
.btn-ghost:hover{border-color:var(--accent2);color:var(--accent2)}
/* 3D 预览卡片 */
.hero-visual{position:relative}
.hero-visual::before{
  content:"";position:absolute;inset:-16px;border-radius:28px;pointer-events:none;
  background:radial-gradient(circle at 72% 18%,rgba(78,168,255,.2),transparent 60%);
  filter:blur(12px);
}
.preview-card{
  position:relative;border-radius:20px;overflow:hidden;
  border:1px solid rgba(78,168,255,.26);
  background:linear-gradient(180deg,rgba(23,37,60,.92),rgba(11,19,30,.97));
  box-shadow:0 26px 64px rgba(0,0,0,.5),inset 0 1px 0 rgba(255,255,255,.07);
}
.preview-card::after{
  content:"";position:absolute;inset:0;border-radius:20px;pointer-events:none;
  background:linear-gradient(140deg,rgba(255,255,255,.07),transparent 32%);
}
.preview-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:12px 15px;border-bottom:1px solid rgba(78,168,255,.14);font-size:12px;
}
.p-live{display:inline-flex;align-items:center;gap:7px;color:var(--accent);font-weight:700;letter-spacing:.4px}
.p-live i{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);animation:pulse 1.6s infinite}
.p-label{color:var(--dim)}
.preview-stage{
  position:relative;width:100%;aspect-ratio:16/11;min-height:236px;
  background:
    radial-gradient(70% 58% at 50% 24%,rgba(78,168,255,.16),transparent 70%),
    radial-gradient(62% 42% at 50% 98%,rgba(61,220,151,.1),transparent 72%),
    linear-gradient(180deg,#0d1626,#0a1018);
  overflow:hidden;touch-action:pan-y;
}
.preview-poster{
  position:absolute;inset:0;width:100%;height:100%;
  opacity:.85;transition:opacity .6s ease;pointer-events:none;
}
.preview-stage canvas{position:relative;display:block;width:100%;height:100%}
.is-ready .preview-poster{opacity:0}
.preview-hint{
  position:absolute;right:12px;bottom:12px;padding:4px 10px;border-radius:999px;
  background:rgba(10,16,26,.72);border:1px solid rgba(78,168,255,.24);
  color:var(--dim);font-size:11.5px;backdrop-filter:blur(6px);z-index:2;
}
.preview-loading{position:absolute;left:0;right:0;top:0;height:2px;background:rgba(78,168,255,.14);overflow:hidden;z-index:2}
.preview-loading i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent2),var(--accent));transition:width .3s}
.is-ready .preview-loading{opacity:0;transition:opacity .5s}
.preview-fallback .preview-hint{display:none}
.preview-fallback .preview-poster{opacity:1}
.preview-foot{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  padding:11px 15px;border-top:1px solid rgba(78,168,255,.14);font-size:12px;
}
.chip{padding:3px 9px;border-radius:999px;background:rgba(78,168,255,.1);color:var(--dim)}
.p-more{margin-left:auto;color:var(--accent2);font-weight:700;white-space:nowrap}
.p-more:hover{color:var(--accent)}
/* 数据条 */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px auto 0;max-width:760px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 10px;text-align:center;transition:.22s}
.stat:hover{border-color:rgba(61,220,151,.45);transform:translateY(-2px)}
.stat b{display:block;font-size:22px;color:var(--accent)}
.stat span{font-size:12px;color:var(--dim)}
/* 通用区块 */
section.block{padding:52px 0 8px}
.eyebrow{color:var(--accent2);font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase}
h2{font-size:clamp(21px,4.6vw,30px);font-weight:800;margin:8px 0 10px}
.lead{color:var(--dim);font-size:15px;max-width:700px}
/* 关卡卡片 */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(226px,1fr));gap:14px;margin-top:26px}
.card{
  position:relative;background:linear-gradient(180deg,var(--panel),#0e1724);
  border:1px solid var(--line);border-radius:16px;padding:20px;transition:.24s;overflow:hidden;
}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 100% 0%,rgba(78,168,255,.14),transparent 58%);opacity:0;transition:.24s}
.card:hover{transform:translateY(-4px);border-color:rgba(78,168,255,.5)}
.card:hover::before{opacity:1}
.card .ico{font-size:26px;line-height:1}
.card h3{font-size:17px;margin:12px 0 6px}
.card p{font-size:13.5px;color:var(--dim);min-height:42px}
.card .meta{display:flex;align-items:center;justify-content:space-between;margin-top:14px;font-size:12px;color:var(--dim)}
.stars{color:var(--warn);letter-spacing:1px}
.tag{padding:3px 9px;border-radius:999px;background:rgba(61,220,151,.12);color:var(--accent);font-weight:600}
.tag.blue{background:rgba(78,168,255,.12);color:var(--accent2)}
/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin-top:26px;counter-reset:s}
.step{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 18px 18px 56px;position:relative}
.step::before{
  counter-increment:s;content:counter(s);position:absolute;left:16px;top:16px;
  width:28px;height:28px;border-radius:9px;display:grid;place-items:center;
  background:rgba(78,168,255,.14);color:var(--accent2);font-weight:800;font-size:14px;
}
.step h3{font-size:15px;margin-bottom:5px}
.step p{font-size:13px;color:var(--dim)}
/* FAQ */
.faq{margin-top:24px;border-top:1px solid var(--line)}
details{border-bottom:1px solid var(--line);padding:16px 0}
summary{font-weight:700;font-size:15px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--accent);font-size:19px;line-height:1}
details[open] summary::after{content:"−"}
details p{margin-top:10px;color:var(--dim);font-size:14px}
/* CTA 区 */
.cta-band{
  margin:56px 0 0;padding:34px 24px;border-radius:20px;text-align:center;
  background:linear-gradient(120deg,rgba(61,220,151,.12),rgba(78,168,255,.12));
  border:1px solid var(--line);
}
.cta-band h2{margin-bottom:8px}
.cta-band p{color:var(--dim);font-size:14px;margin-bottom:20px}
/* 页脚 */
footer{margin-top:60px;border-top:1px solid var(--line);padding:26px 0 40px;color:var(--dim);font-size:13px}
.foot-in{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center}
footer nav{display:flex;gap:16px;flex-wrap:wrap}
footer a:hover{color:var(--accent2)}
/* 滚动入场 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media(max-width:860px){
  .hero{grid-template-columns:1fr;gap:24px;padding:34px 0 16px}
  .hero-copy p.sub{max-width:none}
  .bg-ring{display:none}
  .preview-stage{aspect-ratio:16/10;min-height:210px}
  .nav-in{padding:0 14px}
  .nav-links a{padding:6px 10px;font-size:13px;white-space:nowrap}
  .logo{white-space:nowrap;flex-shrink:0}
}
@media(max-width:560px){
  /* 顶部导航窄屏适配：不换行、不挤压 */
  .nav-in{height:52px;padding:0 12px;gap:8px}
  .logo{font-size:13.5px;letter-spacing:0;gap:6px}
  .logo-dot{width:7px;height:7px;box-shadow:0 0 9px var(--accent)}
  .nav-links{gap:3px;flex-shrink:0}
  .nav-links a{padding:6px 9px;font-size:12.5px;white-space:nowrap}
  .nav-links a:first-child{display:none}
  .nav-links a.cta{padding:7px 11px;font-size:12.5px;letter-spacing:0}
  .h1-top{letter-spacing:2px;margin-bottom:8px}
  .h1-tail{font-size:14px;margin-top:8px}
  .hero-points{gap:8px 14px}
  .hero-points li{font-size:12.5px}
  .btn{padding:11px 20px;font-size:14px}
  .stats{gap:8px}
  .stat{padding:13px 8px}
  .stat b{font-size:18px}
  .card p{min-height:0}
  .preview-head{padding:10px 12px}
  .p-label{font-size:11px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}