:root{--accent:#0e7490;--btn:#14b8a6}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:#f7f9fb;color:#1c2430;font:16px/1.65 system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
a{color:inherit}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800}
h2{font-size:clamp(1.4rem,3vw,1.9rem);font-weight:750}
h3{font-size:1.08rem;font-weight:700}
p{margin:0 0 .8em}
code{font:.9em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#eef1f5;padding:.1em .35em;border-radius:5px}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
.narrow{max-width:780px}
.muted{color:#6b7684}
.lead{font-size:1.08rem;color:#4a5563}

.top{position:sticky;top:0;z-index:5;background:rgba(247,249,251,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid #e7ebf0}
.top-in{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.12rem;text-decoration:none}
.logo-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--accent);color:#fff;font-weight:900;font-size:1.05rem}
.logo-img{width:34px;height:34px;border-radius:10px;object-fit:cover}
.nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.nav a{text-decoration:none;padding:7px 12px;border-radius:999px;color:#3b4552;font-weight:550}
.nav a:hover,.nav a[aria-current]{background:#eceff4;color:#111}
.nav .nav-login{background:#1c2430;color:#fff}
.nav .nav-login:hover{background:#000;color:#fff}

.hero{background-color:#f7f9fb;background-image:radial-gradient(#d9dee6 1.1px,transparent 1.1px);background-size:20px 20px;border-bottom:1px solid #e7ebf0}
.hero-in{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;padding-top:72px;padding-bottom:80px}
.hero-sub{color:var(--accent);font-size:1.35rem;font-weight:700;margin-bottom:1.1em}
.checks{list-style:none;padding:0;margin:0 0 1.3em;display:grid;gap:.45em}
.checks li{position:relative;padding-left:30px}
.checks li::before{content:"";position:absolute;left:0;top:.28em;width:20px;height:20px;border-radius:50%;background:var(--accent)}
.checks li::after{content:"";position:absolute;left:7px;top:.52em;width:6px;height:10px;border:solid #fff;border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.perks{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:1.4em}
.perk{background:#fff;border:1.5px solid var(--accent);color:#1c2430;border-radius:999px;padding:5px 14px;font-weight:650;font-size:.94rem}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 28px;border-radius:999px;font-weight:750;text-decoration:none;border:2px solid transparent;transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--btn);color:#1c2430;box-shadow:0 6px 18px -8px rgba(0,0,0,.35)}
.btn-ghost{background:#fff;border-color:#1c2430;color:#1c2430}
.hero-art{display:grid;place-items:center}
.orb{position:relative;width:280px;height:280px;display:grid;place-items:center}
.orb-ring{position:absolute;inset:0;border-radius:50%;border:2px dashed color-mix(in srgb,var(--accent) 55%,transparent);animation:spin 40s linear infinite}
.orb-core{width:150px;height:150px;border-radius:44px;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:4.4rem;font-weight:900;box-shadow:0 24px 50px -18px color-mix(in srgb,var(--accent) 80%,#000)}
.orb-state{position:absolute;bottom:18px;background:#fff;border-radius:999px;padding:6px 16px;font-weight:700;font-size:.9rem;box-shadow:0 8px 24px -10px rgba(0,0,0,.25)}
.orb-state::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:#22c55e;margin-right:8px;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.orb-ring{animation:none}.btn{transition:none}}

.band{padding:72px 0}
.band-alt{background:#fff;border-top:1px solid #edf0f4;border-bottom:1px solid #edf0f4}
.steps{list-style:none;padding:0;margin:28px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.steps li{background:#fff;border:1px solid #e7ebf0;border-radius:18px;padding:24px}
.step-n{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--btn);font-weight:800;margin-bottom:12px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:28px}
.card{background:#f7f9fb;border-radius:18px;padding:24px;border-top:4px solid var(--accent)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.mini{color:#6b7684;font-size:.95rem;text-transform:none}
.tags{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}
.tags li{background:#fff;border:1px solid #e1e6ec;border-radius:999px;padding:6px 14px;font-size:.95rem}
.plat{display:block;background:#f7f9fb;border:1px solid #e7ebf0;border-radius:18px;padding:22px;text-decoration:none;transition:border-color .12s}
.plat:hover{border-color:var(--accent)}
.plat p{color:#6b7684;margin:0}

.acc{margin-top:22px;display:grid;gap:10px}
.acc details{background:#fff;border:1px solid #e7ebf0;border-radius:14px;padding:0 20px}
.band-alt .acc details{background:#f7f9fb}
.acc summary{cursor:pointer;list-style:none;padding:16px 28px 16px 0;font-weight:650;position:relative}
.acc summary::-webkit-details-marker{display:none}
.acc summary::after{content:"+";position:absolute;right:0;top:12px;font-size:1.4rem;color:var(--accent);font-weight:700}
.acc details[open] summary::after{content:"−"}
.acc details p{padding-bottom:16px;color:#4a5563}

.closing{text-align:center}
.closing-in{display:grid;justify-items:center;gap:16px}

.page-head{padding:56px 0 8px;background-image:radial-gradient(#d9dee6 1.1px,transparent 1.1px);background-size:20px 20px}
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.dl-card{background:#fff;border:1px solid #e7ebf0;border-radius:20px;padding:28px;display:flex;flex-direction:column;align-items:flex-start;gap:12px;scroll-margin-top:80px}
.dl-card h2{margin:0}
.qr{border-radius:12px;border:1px solid #e7ebf0;background:#fff}
.meta{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;margin:6px 0 0;font-size:.92rem;width:100%}
.meta dt{color:#6b7684}
.meta dd{margin:0}
.hash{font:12.5px/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;word-break:break-all}
.note{background:#fff8ec;border-left:3px solid var(--accent);padding:10px 14px;border-radius:8px;font-size:.93rem;margin:0}

.legal h2{margin-top:1.6em;font-size:1.25rem}
.legal ul{padding-left:1.2em}
.legal li{margin-bottom:.4em}

.foot{background:#1c2430;color:#c9d0d9;padding:44px 0}
.foot-in{display:grid;gap:14px}
.foot-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800}
.foot-links{display:flex;flex-wrap:wrap;gap:6px 18px}
.foot-links a{text-decoration:none;color:#c9d0d9}
.foot-links a:hover{color:#fff}
.foot-note,.foot-copy,.foot-mail{margin:0;font-size:.9rem;color:#8d97a5}
.foot-mail a{color:#c9d0d9;text-decoration:none}
.foot-mail a:hover{color:#fff}

@media (max-width:860px){
  .hero-in,.split{grid-template-columns:1fr}
  .hero-art{display:none}
  .steps,.grid3{grid-template-columns:1fr}
  .grid4,.dl-grid{grid-template-columns:1fr 1fr}
  .nav a{padding:6px 9px}
}
@media (max-width:560px){
  .grid4,.dl-grid{grid-template-columns:1fr}
  .band{padding:52px 0}
  .top-in{height:auto;padding-top:10px;padding-bottom:10px;flex-wrap:wrap}
}