:root{
  --bg:#050505;
  --fg:#e8eeea;
  --mute:#8a9690;
  --line:#1a1f1c;
  --celadon:#7dcaa6;
  --card:#0c0e0d;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI","PingFang SC","Noto Sans SC",sans-serif;
  background:
    radial-gradient(circle at 1px 1px,rgba(125,202,166,.12) 1px,transparent 0) 0 0 / 22px 22px,
    var(--bg);
  color:var(--fg);
  line-height:1.55;
}
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(8,10,9,.55);
  border-bottom:1px solid rgba(125,202,166,.18);
  backdrop-filter:blur(8px);
}
.logo{font-weight:700;color:var(--celadon)}
.menu{display:flex;gap:20px;font-size:13px;color:var(--mute)}
.menu a:hover{color:var(--fg)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:36px;padding:0 14px;border-radius:10px;
  background:var(--celadon);color:#04110b;font-size:13px;font-weight:700;
}
.glow{box-shadow:0 0 0 1px rgba(125,202,166,.35),0 0 24px rgba(125,202,166,.28)}
.hero{position:relative;padding:72px 7vw 56px;overflow:hidden}
.hero.compact{padding:56px 7vw 28px}
.rays{
  position:absolute;inset:-20% 20% auto;height:420px;pointer-events:none;
  background:conic-gradient(from 200deg at 50% 0%,transparent 0 38%,rgba(125,202,166,.08) 42%,transparent 48%,rgba(125,202,166,.05) 52%,transparent 60%);
  filter:blur(8px);
}
.easy{position:relative;font-size:clamp(26px,4vw,44px);font-weight:700;color:var(--celadon);margin-bottom:14px}
h1{position:relative;font-size:clamp(20px,2.6vw,30px);font-weight:650;max-width:18ch}
.sub{position:relative;margin-top:10px;max-width:44ch;color:var(--mute)}
.line{position:relative;margin:12px 0 24px}
.float{
  position:relative;margin-top:40px;max-width:420px;
  background:rgba(12,14,13,.72);border:1px solid rgba(125,202,166,.28);
  backdrop-filter:blur(8px);border-radius:16px;padding:16px 16px 12px;
  box-shadow:0 24px 60px rgba(0,0,0,.45),0 0 40px rgba(125,202,166,.08);
}
.float header{font-size:12px;letter-spacing:.16em;color:var(--celadon);margin-bottom:12px}
.float .en,.float .zh{padding:8px 10px;border-radius:10px;margin:8px 0;font-size:14px;max-width:90%}
.float .en{background:#121614;color:#cfd8d3}
.float .zh{background:rgba(125,202,166,.12);margin-left:auto;color:#d9f5e8}
.float img{margin-top:12px;height:90px;object-fit:cover;width:100%;border-radius:10px;filter:grayscale(.4) contrast(1.05);opacity:.85}
section{padding:64px 7vw;border-top:1px solid var(--line)}
section>p{margin:8px 0 24px;color:var(--mute);max-width:56ch}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.cards article{
  background:var(--card);border:1px solid var(--line);border-radius:14px;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:36px;align-items:center}
.split img,.docs img{width:100%;height:280px;object-fit:cover;border-radius:14px;border:1px solid var(--line);filter:grayscale(.35)}
.split ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0 20px}
.split li{border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:14px}
details{border-bottom:1px solid var(--line);padding:12px 0}
summary{cursor:pointer;font-weight:600}
details p{margin-top:8px;max-width:70ch;color:var(--mute)}
section a[href="help.html"]{color:var(--celadon)}
.ghost{display:inline-block;margin-top:12px;color:var(--celadon);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:72px;align-self:start}
.help aside a{color:var(--mute);font-size:14px}
.help aside a:hover{color:var(--celadon)}
.docs article{margin-bottom:32px}
.docs img{max-width:460px;height:210px;margin:14px 0}
.policy{margin-top:12px;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
footer{padding:36px 7vw 20px;border-top:1px solid var(--line)}
.cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:18px}
.cols h4{font-size:12px;color:var(--celadon);margin-bottom:8px}
.cols a,.cols p{display:block;margin:6px 0;color:var(--mute);font-size:13px}
.copy{margin-top:18px;font-size:12px;color:#4a524e}
@media (max-width:980px){
  .menu{display:none}
  .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}}