:root{
  --ink:#0c2a3a;
  --mute:#3d6274;
  --glass:rgba(255,255,255,.28);
  --line:rgba(255,255,255,.45);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI","PingFang SC","Noto Sans SC",sans-serif;
  color:var(--ink);
  line-height:1.55;
  min-height:100vh;
  background:
    radial-gradient(900px 500px at 12% 10%,#7ce0d8 0%,transparent 55%),
    radial-gradient(800px 480px at 88% 18%,#4aa8e8 0%,transparent 50%),
    linear-gradient(160deg,#1a6b8a,#2bb3a3 48%,#6fd3c8);
  background-attachment:scroll;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
nav{
  position:sticky;top:0;z-index:12;
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 7vw;
  background:rgba(255,255,255,.18);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.logo{font-weight:700;color:#fff}
.menu{display:flex;gap:20px;font-size:14px;color:rgba(255,255,255,.86)}
.menu a:hover{color:#fff}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:36px;padding:0 14px;border-radius:12px;
  background:#fff;color:var(--ink);font-size:13px;font-weight:700;
}
.hero{padding:64px 7vw 48px;color:#fff}
.hero.compact{padding:48px 7vw 24px}
.first{font-size:clamp(28px,4.4vw,52px);font-weight:750;letter-spacing:-.03em;margin-bottom:14px}
h1{font-size:clamp(20px,2.6vw,30px);font-weight:700;max-width:18ch}
.sub{margin-top:10px;max-width:44ch;opacity:.92}
.line{margin:12px 0 22px}
.stack{position:relative;height:220px;max-width:560px;margin:36px 0 0}
.stack.row{height:auto;display:flex;flex-wrap:wrap;gap:10px;max-width:none}
.glass{
  display:flex;align-items:center;justify-content:center;
  position:absolute;width:220px;height:88px;
  background:var(--glass);border:1px solid var(--line);
  backdrop-filter:blur(8px);border-radius:18px;
  font-weight:700;color:#083041;
  box-shadow:0 16px 40px rgba(8,48,65,.12);
}
.stack.row .glass{position:relative;width:auto;padding:0 18px;height:56px}
.g2{left:48px;top:36px}
.g3{left:96px;top:72px}
.g4{left:144px;top:108px}
.hero img,.split img,.docs img{
  margin-top:36px;width:min(480px,100%);height:220px;object-fit:cover;
  border-radius:20px;border:1px solid var(--line);filter:grayscale(.1);
  box-shadow:0 20px 48px rgba(8,48,65,.16);
}
section{padding:56px 7vw}
section h2,section>p,.cards,.split,.help,.docs{position:relative}
section>p{margin:8px 0 24px;color:#e8fbff;max-width:56ch}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.cards article{
  background:rgba(255,255,255,.32);backdrop-filter:blur(8px);
  border:1px solid var(--line);border-radius:16px;padding:18px;
}
.cards h3{font-size:15px;margin-bottom:8px}
.cards p{color:var(--mute);font-size:14px}
.cards b{display:block;margin-top:12px}
.cards small{color:var(--mute)}
.three{grid-template-columns:repeat(3,1fr)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.split img{margin:0;width:100%;height:300px}
.split ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0 20px}
.split li{
  background:rgba(255,255,255,.28);backdrop-filter:blur(8px);
  border:1px solid var(--line);border-radius:12px;padding:8px 10px;font-size:14px;
}
details{border-bottom:1px solid var(--line);padding:12px 0;color:#fff}
summary{cursor:pointer;font-weight:600}
details p{margin-top:8px;max-width:70ch;color:#e8fbff}
.ghost{display:inline-block;margin-top:12px;color:#083041;font-size:13px}
.help{display:grid;grid-template-columns:200px 1fr;gap:28px}
.help aside{display:flex;flex-direction:column;gap:8px;position:sticky;top:64px;align-self:start}
.help aside a{color:#e8fbff;font-size:14px}
.help aside a:hover{color:#fff}
.docs article{margin-bottom:32px;color:#fff}
.docs img{max-width:460px;height:210px;margin:14px 0}
.policy{margin-top:12px;padding:14px;background:rgba(255,255,255,.28);border:1px solid var(--line);border-radius:14px;color:var(--ink)}
footer{padding:36px 7vw 20px;background:rgba(8,48,65,.18);backdrop-filter:blur(8px)}
.cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:18px;color:#fff}
.cols h4{font-size:13px;margin-bottom:8px}
.cols a,.cols p{display:block;margin:6px 0;color:#e8fbff;font-size:13px}
.copy{margin-top:18px;font-size:12px;color:#cfeff2}
@media (max-width:980px){
  .menu{display:none}
  .stack{height:auto}
  .glass{position:relative;left:0;top:0;margin-bottom:10px}
  .cards,.three,.split,.help,.cols{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}