:root{
  --bg:#f6f8fb; --bg2:#ffffff; --ink:#0b1220; --ink2:#334155; --muted:#6b7c93;
  --blue:#0071e3; --blue2:#2f8dfb; --line:rgba(15,23,42,.09); --glass:rgba(255,255,255,.72);
  --card:rgba(255,255,255,.86); --shadow:0 1px 2px rgba(15,23,42,.04),0 12px 32px -12px rgba(15,23,42,.16);
  --radius:18px;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0b0f16; --bg2:#111826; --ink:#eef2f8; --ink2:#c3cddc; --muted:#8b9bb3;
    --line:rgba(255,255,255,.10); --glass:rgba(22,29,41,.7); --card:rgba(20,27,39,.82);
    --shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -16px rgba(0,0,0,.7); }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  background-image:radial-gradient(1200px 600px at 82% -8%,rgba(0,113,227,.10),transparent 62%),
                   radial-gradient(900px 500px at 6% 4%,rgba(47,141,251,.07),transparent 60%);
  background-attachment:fixed;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;letter-spacing:-.02em;font-weight:600}
p{margin:0}
code,pre{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:28px;
  padding:14px max(22px,calc((100vw - 1160px)/2));backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);background:var(--glass);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:9px;font-weight:600;letter-spacing:-.01em;color:var(--blue)}
.brand span{display:flex;align-items:baseline;gap:8px;color:var(--ink)}
.brand i{font-style:normal;font-size:11.5px;font-weight:500;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:2px 8px}
.nav-links{display:flex;gap:22px;margin-left:auto}
.nav-links a{font-size:13.5px;color:var(--ink2);padding:6px 0;border-bottom:1px solid transparent;transition:.18s}
.nav-links a:hover{color:var(--ink);border-color:var(--blue)}
.nav-act{display:flex;gap:10px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:36px;padding:0 16px;
  border-radius:11px;font-size:13.5px;font-weight:500;border:1px solid var(--line);background:var(--card);
  color:var(--ink);cursor:pointer;transition:.18s;white-space:nowrap}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn.primary{background:linear-gradient(180deg,var(--blue2),var(--blue));color:#fff;border-color:transparent}
.btn.ghost{background:transparent}
.btn.lg{height:44px;padding:0 22px;font-size:14.5px;border-radius:13px}
.btn.sm{height:30px;padding:0 12px;font-size:12.5px;border-radius:9px}

/* ---------- hero ---------- */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;
  max-width:1160px;margin:0 auto;padding:76px 22px 56px}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);font-weight:600}
.hero h1{font-size:52px;line-height:1.1;margin:16px 0 18px;letter-spacing:-.035em}
.lede{color:var(--ink2);font-size:16px;max-width:30em}
.hero-act{display:flex;gap:12px;margin:30px 0 14px}
.fineprint{font-size:12.5px;color:var(--muted)}
.glass{background:var(--glass);backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.hero-card{padding:24px;color:var(--blue)}
.hc-head{display:flex;align-items:center;justify-content:space-between;font-size:12.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.dot{width:7px;height:7px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 3px rgba(0,113,227,.16)}
.hc-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0 6px;color:var(--ink)}
.hc-metrics b{display:block;font-size:30px;font-weight:600;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.hc-metrics span{font-size:11.5px;color:var(--muted)}
.spark{width:100%;height:48px;color:var(--blue2);opacity:.85;margin:6px 0 14px}
.hc-rows{border-top:1px solid var(--line);padding-top:12px}
.hc-rows div{display:flex;justify-content:space-between;font-size:13px;padding:7px 0;color:var(--muted)}
.hc-rows em{font-style:normal;color:var(--ink2)}

/* ---------- strip ---------- */
.strip{border-block:1px solid var(--line);background:var(--bg2)}
.strip-in{max-width:1160px;margin:0 auto;padding:26px 22px;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.strip-in b{display:block;font-size:26px;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.strip-in span{font-size:12.5px;color:var(--muted)}

/* ---------- sections ---------- */
.sec{max-width:1160px;margin:0 auto;padding:76px 22px}
.sec.alt{background:var(--bg2);border-block:1px solid var(--line);max-width:none;padding-inline:max(22px,calc((100vw - 1160px)/2))}
.sec-head{max-width:640px;margin-bottom:38px}
.sec-head h2{font-size:32px;letter-spacing:-.03em}
.sec-head p{color:var(--muted);margin-top:10px}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:.2s}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.card.skeleton{height:186px;opacity:.5;animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{opacity:.28}}
.ico{width:24px;height:24px;fill:none;stroke:var(--blue);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:16.5px;margin:14px 0 8px}
.card p{color:var(--ink2);font-size:13.5px}
.card ul{margin:14px 0 0;padding:0;list-style:none;border-top:1px solid var(--line);padding-top:12px}
.card li{font-size:12.5px;color:var(--muted);padding:3px 0 3px 14px;position:relative}
.card li::before{content:"";position:absolute;left:0;top:10px;width:5px;height:5px;border-radius:50%;background:var(--blue);opacity:.5}

/* ---------- algos ---------- */
.algo-wrap{display:grid;grid-template-columns:220px 1fr;gap:22px}
.algo-tabs{display:flex;flex-direction:column;gap:6px}
.tab{text-align:left;padding:11px 14px;border-radius:11px;border:1px solid transparent;background:transparent;
  color:var(--ink2);font-size:13.5px;cursor:pointer;transition:.18s;font-family:inherit}
.tab:hover{background:var(--card)}
.tab.active{background:var(--card);border-color:var(--line);color:var(--ink);font-weight:500}
.code{margin:0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;overflow-x:auto;font-size:12.5px;line-height:1.75;color:var(--ink2)}
.code code{white-space:pre}
.hidden{display:none}

/* ---------- pricing ---------- */
.price-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.plan{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.plan.hot{border-color:rgba(0,113,227,.45);box-shadow:0 0 0 4px rgba(0,113,227,.07)}
.plan h3{font-size:15px}
.plan .days{font-size:12.5px;color:var(--muted);margin-top:4px}
.plan .price{font-size:34px;font-weight:600;letter-spacing:-.03em;margin:16px 0 4px;font-variant-numeric:tabular-nums}
.plan .price i{font-size:15px;font-style:normal;font-weight:500;color:var(--muted);margin-right:2px}
.plan .dl{font-size:12.5px;color:var(--muted)}
.plan .btn{width:100%;margin-top:18px}
.badge{position:absolute;top:16px;right:16px;font-size:11px;color:var(--blue);
  border:1px solid rgba(0,113,227,.3);border-radius:999px;padding:2px 9px}

/* ---------- activate ---------- */
.act-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:32px;padding:30px}
.act-form label{display:block;font-size:12.5px;color:var(--muted);margin:14px 0 6px}
.act-form label:first-child{margin-top:0}
.act-form input{width:100%;height:46px;padding:0 14px;border-radius:13px;border:1px solid var(--line);
  background:var(--bg2);color:var(--ink);font-size:14px;font-family:inherit;outline:none;transition:.18s}
.act-form input:focus{border-color:rgba(0,113,227,.5);box-shadow:0 0 0 4px rgba(0,113,227,.1)}
.act-row{display:flex;align-items:center;gap:14px;margin:20px 0 12px}
.act-row .btn{height:44px;padding:0 26px;border-radius:13px;font-size:14.5px}
.act-msg{font-size:13px;color:var(--muted)}
.act-msg.ok{color:#0a8f4d}.act-msg.bad{color:#d2453d}
.act-side{border-left:1px solid var(--line);padding-left:30px}
.act-side h4{font-size:14px}
.act-side>p{font-size:13px;color:var(--muted);margin-top:10px}
.act-side dl{margin:18px 0;font-size:13px}
.act-side dt{color:var(--muted);font-size:12px;margin-top:10px}
.act-side dd{margin:3px 0 0;word-break:break-all;font-family:ui-monospace,Menlo,monospace;font-size:12px}

/* ---------- download ---------- */
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.dl-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  display:flex;flex-direction:column;gap:10px;transition:.2s}
.dl-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.dl-head{display:flex;align-items:center;justify-content:space-between}
.dl-head h3{font-size:15px}
.dl-card p{font-size:13px;color:var(--muted)}
.dl-meta{display:flex;gap:14px;font-size:11.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.dl-card .btn{margin-top:auto}
.dl-hash{font-family:ui-monospace,Menlo,monospace;font-size:10.5px;color:var(--muted);
  word-break:break-all;opacity:.8}
.dl-cmd{margin:0;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px;
  font-size:11.5px;overflow-x:auto;color:var(--ink2)}
.tag{font-size:11px;color:var(--blue);border:1px solid rgba(0,113,227,.3);border-radius:999px;padding:2px 9px}

/* ---------- steps ---------- */
.steps{list-style:none;margin:0;padding:0;counter-reset:s;display:grid;gap:2px}
.steps li{counter-increment:s;display:grid;grid-template-columns:150px 1fr;gap:22px;
  padding:18px 0;border-top:1px solid var(--line);font-size:13.5px;color:var(--ink2)}
.steps li b{color:var(--ink);font-weight:600}
.steps li b::before{content:counter(s,decimal-leading-zero);display:block;font-size:11px;
  color:var(--blue);letter-spacing:.1em;margin-bottom:4px}
.steps code{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:12.5px}
.cmd{margin-top:24px}
.cmd>span{font-size:12.5px;color:var(--muted)}
.cmd pre{margin:10px 0 0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;overflow-x:auto;font-size:12.5px;color:var(--ink2)}

/* ---------- footer ---------- */
.foot{max-width:1160px;margin:0 auto;padding:46px 22px 64px;display:flex;justify-content:space-between;
  gap:30px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.brand-mini{font-weight:600;color:var(--ink);letter-spacing:-.01em}
.foot p{margin-top:8px;max-width:34em}
.foot-links{display:flex;gap:20px;align-items:flex-start}
.foot-links a:hover{color:var(--ink)}

@media (max-width:980px){
  .hero{grid-template-columns:1fr;gap:34px;padding-top:52px}
  .hero h1{font-size:38px}
  .grid{grid-template-columns:1fr 1fr}
  .algo-wrap{grid-template-columns:1fr}
  .algo-tabs{flex-direction:row;overflow-x:auto}
  .act-wrap{grid-template-columns:1fr;gap:24px;padding:22px}
  .act-side{border-left:0;border-top:1px solid var(--line);padding:22px 0 0}
  .strip-in{grid-template-columns:1fr 1fr;gap:18px}
  .nav-links{display:none}
  .steps li{grid-template-columns:1fr;gap:6px}
  .foot{flex-direction:column}
}
@media (max-width:640px){
  .grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .sec{padding:52px 20px}
  .nav-act .btn.ghost{display:none}
}