:root{
  --bg:#f6f7f7; --surface:#ffffff; --ink:#111416; --body:#2c3236; --muted:#667077;
  --accent:#0f9f8c; --accent-fill:#2dd4bf; --on-accent:#062b26; --border:#e1e5e7; --soft:#e6f7f4;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0b0d0e; --surface:#15191b; --ink:#f2f5f6; --body:#c9d0d3; --muted:#8a9499;
    --accent:#2dd4bf; --accent-fill:#2dd4bf; --on-accent:#062b26; --border:#252b2e; --soft:#12302b;
  }
}
:root[data-theme="dark"]{
  --bg:#0b0d0e; --surface:#15191b; --ink:#f2f5f6; --body:#c9d0d3; --muted:#8a9499;
  --accent:#2dd4bf; --accent-fill:#2dd4bf; --on-accent:#062b26; --border:#252b2e; --soft:#12302b;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--body);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
h1,h2,h3{color:var(--ink);font-family:ui-rounded,"SF Pro Rounded",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-weight:700;letter-spacing:-.01em}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
code{font-size:.92em;background:var(--soft);border-radius:5px;padding:1px 5px;overflow-wrap:anywhere}

/* document pages */
.wrap{max-width:760px;margin:0 auto;padding:40px 22px 72px}
header.top{display:flex;align-items:center;gap:12px;margin-bottom:28px}
header.top a{display:flex;align-items:center;gap:12px;color:var(--ink)}
header.top a:hover{text-decoration:none}
.logo{width:40px;height:40px;border-radius:10px;flex:none;display:block}
.brand{font-weight:700;font-size:18px}
.doc h1{font-size:34px;line-height:1.15;margin:.2em 0 .1em}
.doc h2{font-size:22px;margin:2em 0 .5em}
.doc h3{font-size:18px;margin:1.4em 0 .3em}
.eff{color:var(--muted);font-size:14px;margin-bottom:8px}
.lead{font-size:18px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px 20px;margin:18px 0}
.card.good{border-left:4px solid var(--accent-fill)}
ul{padding-left:22px}
li{margin:.35em 0}
.table{overflow-x:auto;margin:14px 0}
table{border-collapse:collapse;width:100%;font-size:15px;min-width:560px}
th,td{border:1px solid var(--border);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--soft);color:var(--ink);font-weight:600}
td{background:var(--surface)}
details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin:10px 0}
details summary{cursor:pointer;color:var(--ink);font-weight:600}
details[open] summary{margin-bottom:6px}
.btn{display:inline-block;background:var(--accent-fill);color:var(--on-accent);font-weight:700;border-radius:12px;padding:12px 20px}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
footer.foot{margin-top:44px;padding-top:20px;border-top:1px solid var(--border);color:var(--muted);font-size:14px;
  display:flex;gap:8px 18px;flex-wrap:wrap}
footer.foot a{color:var(--muted)}

/* landing */
.nav{border-bottom:1px solid var(--border)}
.nav .inner{max-width:1040px;margin:0 auto;padding:0 22px;height:64px;display:flex;align-items:center;gap:12px}
.nav .spacer{flex:1}
.nav a.small{color:var(--muted);font-size:15px;margin-left:20px}
.hero{max-width:1040px;margin:0 auto;padding:72px 22px 56px;text-align:center}
.hero img.big{width:112px;height:112px;border-radius:26px;box-shadow:0 12px 40px rgba(45,212,191,.25)}
.hero h1{font-size:clamp(34px,5.4vw,56px);line-height:1.08;margin:.5em 0 .3em}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{font-size:clamp(17px,2vw,20px);max-width:620px;margin:0 auto 28px}
.hero .note{font-size:14px;color:var(--muted);margin-top:14px}
.meter{max-width:420px;margin:40px auto 0;background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:20px 22px;text-align:left}
.meter .row{display:flex;justify-content:space-between;font-size:14px;color:var(--muted);margin:10px 0 6px}
.meter .row b{color:var(--ink);font-variant-numeric:tabular-nums;font-family:ui-rounded,-apple-system,sans-serif}
.bar{height:12px;border-radius:6px;background:var(--border)}
.bar.now{background:var(--muted);opacity:.55}
.bar.after{background:var(--accent-fill);width:31%}
.meter .freed{margin-top:16px;font-size:22px;font-weight:700;color:var(--ink);font-family:ui-rounded,-apple-system,sans-serif}
.meter .freed span{color:var(--accent)}
section.features{max-width:1040px;margin:0 auto;padding:40px 22px 64px}
section.features h2{text-align:center;font-size:clamp(26px,3.4vw,34px);margin:0 0 8px}
section.features .tag{text-align:center;color:var(--muted);margin:0 0 36px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.feat{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:22px}
.feat .ic{width:44px;height:44px;border-radius:12px;background:var(--soft);display:flex;align-items:center;justify-content:center;
  font-size:22px;margin-bottom:12px}
.feat h3{font-size:19px;margin:0 0 6px}
.feat p{margin:0;font-size:15.5px}
.band{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface)}
.band .inner{max-width:720px;margin:0 auto;padding:48px 22px;text-align:center}
.band h2{font-size:clamp(24px,3.2vw,32px);margin:.1em 0 .3em}
.landing-foot{max-width:1040px;margin:0 auto;padding:32px 22px 56px;color:var(--muted);font-size:14px;display:flex;flex-wrap:wrap;gap:8px 18px}
.landing-foot a{color:var(--muted)}
.landing-foot .spacer{flex:1}

@media (max-width:640px){
  .wrap{padding:32px 16px 56px}
  .doc h1{font-size:28px}
  .doc h2{font-size:20px}
  .lead{font-size:17px}
  .card{padding:16px}
  .nav .inner{padding:0 16px}
  .nav a.small{margin-left:14px;font-size:14px}
  .nav .brand{display:none}
  .hero{padding:48px 16px 40px}
  section.features{padding:32px 16px 48px}
  .band .inner{padding:40px 16px}
  .landing-foot{padding:28px 16px 48px}
  .landing-foot .spacer{display:none}
}