/* taOS landing — native CSS, no framework, no CDN.
   Design language: dark-tech restraint. One accent, real screenshots,
   generous space, motion only where it earns its place. */

:root{
  --bg:#0b0d10;
  --bg-alt:#101318;
  --ink:#e8eaed;
  --ink-dim:#9aa3ad;
  --ink-faint:#5c6670;
  --accent:#3dd68c;
  --accent-ink:#0b0d10;
  --line:#1d232b;
  --radius:14px;
  --max:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* nav */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;transition:background .25s,border-color .25s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(11,13,16,.85);backdrop-filter:blur(12px);border-bottom-color:var(--line)}
.nav-inner{max-width:var(--max);margin:0 auto;display:flex;align-items:center;gap:28px;padding:14px 24px}
.nav-logo{display:flex;align-items:center}
.nav-links{display:flex;gap:22px;margin-left:auto;font-size:.92rem;color:var(--ink-dim)}
.nav-links a:hover{color:var(--ink)}
.nav-gh{color:var(--ink)}

/* buttons */
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);font-weight:600;padding:12px 22px;border-radius:10px;font-size:.95rem;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 24px rgba(61,214,140,.25)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--ink-faint);box-shadow:none}
.btn-small{padding:8px 16px;font-size:.88rem}

/* hero */
.hero{padding:140px 24px 0;text-align:center}
.hero-inner{max-width:780px;margin:0 auto}
.hero-kicker{color:var(--accent);font-size:.85rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;margin-bottom:18px}
.hero h1{font-size:clamp(2.4rem,5.5vw,4rem);line-height:1.08;letter-spacing:-.02em;font-weight:700}
.hero-sub{color:var(--ink-dim);font-size:1.13rem;max-width:640px;margin:22px auto 0}
.hero-ctas{display:flex;gap:14px;justify-content:center;margin-top:30px;flex-wrap:wrap}
.hero-chips{display:flex;gap:10px;justify-content:center;margin-top:26px;flex-wrap:wrap}
.hero-chips span{font-size:.8rem;color:var(--ink-dim);border:1px solid var(--line);border-radius:99px;padding:5px 14px}
.hero-shot{max-width:var(--max);margin:64px auto 0;padding:0 24px}
.hero-shot img{border-radius:var(--radius) var(--radius) 0 0;border:1px solid var(--line);border-bottom:none;box-shadow:0 -10px 80px rgba(61,214,140,.07)}
.hero-shot figcaption{font-size:.8rem;color:var(--ink-faint);padding:10px 0 0;text-align:center}

/* sections */
.section{padding:110px 24px}
.section-alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-inner{max-width:var(--max);margin:0 auto}
.section-inner.narrow{max-width:760px}
h2{font-size:clamp(1.7rem,3.4vw,2.4rem);line-height:1.15;letter-spacing:-.015em;margin-bottom:18px}
.center{text-align:center}
.lede{color:var(--ink-dim);font-size:1.08rem;margin-bottom:16px}
.lede.center{margin-left:auto;margin-right:auto;max-width:680px}
.lede strong{color:var(--ink)}

/* split layout */
.split{display:grid;grid-template-columns:1.2fr .8fr;gap:56px;align-items:center}
.split-shot img{border-radius:var(--radius);border:1px solid var(--line);max-height:540px;width:auto;margin:0 auto}
.ticks{list-style:none;margin-top:22px}
.ticks li{padding-left:26px;position:relative;color:var(--ink-dim);margin-bottom:10px}
.ticks li::before{content:"";position:absolute;left:0;top:.5em;width:14px;height:14px;border-radius:4px;background:linear-gradient(135deg,var(--accent),#2aa86c)}

/* wide shot */
.wide-shot{margin-top:48px}
.wide-shot img{border-radius:var(--radius);border:1px solid var(--line)}
.wide-shot figcaption{font-size:.8rem;color:var(--ink-faint);padding-top:12px;text-align:center}

/* stats */
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:38px}
.stat{border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;background:var(--bg)}
.stat b{font-size:2rem;display:block;letter-spacing:-.02em}
.stat span{color:var(--ink-faint);font-size:.85rem}

/* numbers strip */
.numbers{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-alt)}
.numbers-inner{max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr);text-align:center;padding:42px 24px;gap:12px}
.numbers b{font-size:1.9rem;display:block;letter-spacing:-.02em}
.numbers span{color:var(--ink-faint);font-size:.82rem}

/* install */
.install{padding-bottom:130px}
.code-block{display:flex;align-items:center;gap:14px;background:#070809;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:30px auto 0;max-width:720px;text-align:left}
.code-block code{font-family:var(--mono);font-size:.83rem;color:var(--accent);overflow-x:auto;white-space:nowrap;flex:1;min-width:0}
.copy-btn{background:var(--line);border:none;color:var(--ink);font-size:.8rem;padding:7px 14px;border-radius:8px;cursor:pointer;font-family:var(--font)}
.copy-btn:hover{background:#28303a}
.install-note{font-size:.85rem;color:var(--ink-faint);margin-top:18px}
.install-note a{color:var(--ink-dim);text-decoration:underline}

/* footer */
.footer{border-top:1px solid var(--line);padding:48px 24px}
.footer-inner{max-width:var(--max);margin:0 auto;display:flex;align-items:center;gap:28px;flex-wrap:wrap}
.footer-links{display:flex;flex-wrap:wrap;gap:20px;font-size:.88rem;color:var(--ink-dim)}
.footer-links a:hover{color:var(--ink)}
.footer p{margin-left:auto;font-size:.8rem;color:var(--ink-faint)}

/* reveal motion (respects reduced-motion) */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* responsive */
@media (max-width:880px){
  .nav-links{display:none}
  .split{grid-template-columns:1fr;gap:36px}
  .stat-row{grid-template-columns:1fr}
  .numbers-inner{grid-template-columns:repeat(2,1fr)}
  .section{padding:80px 20px}
  .footer p{margin-left:0}
}

/* coming-soon roadmap */
.soon-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:40px}
.soon{border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;background:var(--bg)}
.soon-tag{display:inline-block;font-size:.7rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);border:1px solid var(--line);border-radius:99px;padding:4px 12px;margin-bottom:14px}
.soon h3{font-size:1.15rem;letter-spacing:-.01em;margin-bottom:8px}
.soon p{color:var(--ink-dim);font-size:.97rem}
@media (max-width:880px){.soon-grid{grid-template-columns:1fr}}

/* sub-pages (stats) */
.subpage-top{padding-top:120px}
.subpage-title{font-size:clamp(2rem,4vw,2.8rem);line-height:1.1;letter-spacing:-.02em;font-weight:700;margin-bottom:14px}
.chart-heading{font-size:clamp(1.3rem,2.6vw,1.7rem);margin-top:48px}
.mix-heading{font-size:1.2rem;margin-bottom:14px}

/* stats: daily-active bar chart */
.chart{display:flex;align-items:flex-end;gap:4px;height:220px;margin-top:24px;padding:14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-alt);overflow-x:auto}
.chart .bar{flex:0 0 28px;min-height:2px;background:var(--accent);border-radius:3px 3px 0 0;transition:opacity .15s}
.chart .bar:hover{opacity:.75}
.chart-empty{color:var(--ink-faint);font-size:.9rem;margin-top:18px}

/* stats: version/platform mix */
.mix{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:48px}
.mix-table{width:100%;border-collapse:collapse}
.mix-table tr{border-bottom:1px solid var(--line)}
.mix-table td{padding:10px 4px;font-size:.92rem}
.mix-name{color:var(--ink-dim);font-family:var(--mono);font-size:.85rem}
.mix-count{text-align:right;color:var(--ink);font-weight:600}
.stats-error{color:var(--ink-faint);font-size:.92rem;margin-top:24px}

@media (max-width:880px){
  .chart .bar{flex-basis:16px}
  .mix{grid-template-columns:1fr;gap:36px}
}
/* changelog */
.changelog-loading,.changelog-error{color:var(--ink-faint);font-size:.92rem;margin-top:8px}
.changelog-error a{color:var(--ink-dim);text-decoration:underline}
.release{border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;background:var(--bg);margin-top:22px}
.release-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.release-tag{font-size:1.3rem;letter-spacing:-.01em;margin:0;font-family:var(--mono)}
.release-pill{font-size:.68rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);border:1px solid var(--line);border-radius:99px;padding:3px 10px}
.release-meta{color:var(--ink-faint);font-size:.85rem;margin:8px 0 0}
.release-body{color:var(--ink-dim);font-size:.97rem;margin-top:16px}
.release-body h4{color:var(--ink);font-size:1rem;margin:18px 0 8px}
.release-body p{margin:0 0 12px}
.release-body ul{list-style:none;margin:0 0 12px;padding:0}
.release-body li{padding-left:22px;position:relative;margin-bottom:8px}
.release-body li::before{content:"";position:absolute;left:0;top:.55em;width:10px;height:10px;border-radius:3px;background:linear-gradient(135deg,var(--accent),#2aa86c)}
.release-body code{font-family:var(--mono);font-size:.85em;background:#070809;border:1px solid var(--line);border-radius:5px;padding:1px 6px;color:var(--accent)}
/* accessibility: visible keyboard focus on all interactive elements */
a:focus-visible, button:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

/* accessibility: contrast. The original --ink-faint (#5c6670) sits at ~3.3:1
   on --bg, below the 4.5:1 AA threshold for body-size text (figcaptions,
   .stat span, .numbers span, install note, footer copy). Lighten it here as
   an override; the original token definition is left untouched. New value
   clears 4.5:1 on both --bg (5.8:1) and --bg-alt (5.6:1). */
:root{--ink-faint:#828e9b}