/* ============================================================
   XerisOS launch site — shared design system.
   Matched to xerisweb.com: near-black ground (#010414 is the
   Xeris theme colour), high-contrast type, sticky header,
   marquee ticker, numbered pillars, scroll reveals.
   ============================================================ */
:root{
  --bg:#010414; --bg-2:#070c22; --panel:#0b1230; --line:#1b2450;
  --ink:#e8ecff; --ink-2:#98a3cc; --ink-3:#5f6a99;
  --accent:#4d7cff; --accent-2:#7de2d1; --warn:#ffb454; --bad:#ff6b6b;
  --max:1180px; --r:14px;
  --f:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --m:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f);
     font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
header.site{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);
  background:rgba(1,4,20,.82);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.02em;font-size:17px}
.brand .dot{width:10px;height:10px;border-radius:3px;background:var(--accent);
  box-shadow:0 0 14px var(--accent)}
.nav nav{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav nav a{font-size:14px;color:var(--ink-2);transition:color .18s}
.nav nav a:hover,.nav nav a[aria-current=page]{color:var(--ink)}
.nav nav a[aria-current=page]{position:relative}
.nav nav a[aria-current=page]::after{content:"";position:absolute;left:0;right:0;bottom:-22px;
  height:2px;background:var(--accent)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:10px;
  font-size:14px;font-weight:600;border:1px solid var(--line);transition:.18s;white-space:nowrap}
.btn:hover{border-color:var(--accent);transform:translateY(-1px)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:#5f8aff;box-shadow:0 8px 28px rgba(77,124,255,.35)}
.burger{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  color:var(--ink);border-radius:9px;padding:7px 11px;font-size:16px;cursor:pointer}

/* ---------- ticker ---------- */
.ticker{border-bottom:1px solid var(--line);background:var(--bg-2);overflow:hidden;
  font-family:var(--m);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3)}
.ticker div{display:flex;gap:44px;padding:11px 0;width:max-content;animation:slide 38s linear infinite}
.ticker span{white-space:nowrap}
@keyframes slide{to{transform:translateX(-50%)}}
@media(prefers-reduced-motion:reduce){.ticker div{animation:none}}

/* ---------- type ---------- */
h1,h2,h3,h4{margin:0;letter-spacing:-.03em;line-height:1.12;font-weight:700}
h1{font-size:clamp(38px,6vw,68px)}
h2{font-size:clamp(27px,3.6vw,40px)}
h3{font-size:20px;letter-spacing:-.02em}
p{margin:0}
.lede{font-size:clamp(17px,2vw,20px);color:var(--ink-2);max-width:64ch}
.eyebrow{font-family:var(--m);font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent-2);margin-bottom:14px}
.muted{color:var(--ink-2)}
.small{font-size:14px}

/* ---------- sections ---------- */
section{padding:86px 0;border-bottom:1px solid var(--line)}
section.tight{padding:56px 0}
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);
  border-radius:var(--r);padding:26px;transition:border-color .2s,transform .2s}
.card:hover{border-color:#2b3a70;transform:translateY(-2px)}
.card h3{margin-bottom:9px}
.card p{color:var(--ink-2);font-size:15px}

/* ---------- hero ---------- */
.hero{padding:96px 0 76px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-40% 30% 40% -20%;
  background:radial-gradient(closest-side,rgba(77,124,255,.20),transparent);pointer-events:none}
.hero::after{content:"";position:absolute;inset:20% -25% -40% 45%;
  background:radial-gradient(closest-side,rgba(125,226,209,.13),transparent);pointer-events:none}
.hero .wrap{position:relative}
.status{display:inline-flex;align-items:center;gap:9px;font-family:var(--m);font-size:12px;
  letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2);border:1px solid var(--line);
  border-radius:999px;padding:6px 14px;margin-bottom:22px}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--accent-2);
  box-shadow:0 0 0 0 rgba(125,226,209,.7);animation:pulse 2.4s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(125,226,209,0)}100%{box-shadow:0 0 0 0 rgba(125,226,209,0)}}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.stat{background:var(--bg);padding:28px 22px}
.stat b{display:block;font-size:clamp(26px,3.4vw,38px);letter-spacing:-.03em;line-height:1}
.stat span{display:block;margin-top:8px;font-size:13px;color:var(--ink-3);
  font-family:var(--m);letter-spacing:.06em;text-transform:uppercase}

/* ---------- pillars ---------- */
.pillar{display:grid;grid-template-columns:88px 1fr;gap:26px;padding:34px 0;
  border-top:1px solid var(--line)}
.pillar .no{font-family:var(--m);font-size:13px;color:var(--accent);letter-spacing:.16em}
.pillar h3{font-size:clamp(22px,2.6vw,28px);margin-bottom:12px}
.pillar p{color:var(--ink-2);max-width:70ch}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.chip{font-family:var(--m);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-2);border:1px solid var(--line);border-radius:999px;padding:5px 11px}

/* ---------- steps / roadmap ---------- */
.steps{counter-reset:s;display:grid;gap:0}
.step{counter-increment:s;display:grid;grid-template-columns:56px 1fr;gap:20px;
  padding:24px 0;border-top:1px solid var(--line)}
.step::before{content:counter(s,decimal-leading-zero);font-family:var(--m);font-size:13px;
  color:var(--accent);letter-spacing:.12em}
.phase{display:grid;grid-template-columns:150px 1fr;gap:24px;padding:26px 0;
  border-top:1px solid var(--line);align-items:start}
.phase .tag{font-family:var(--m);font-size:12px;letter-spacing:.1em;text-transform:uppercase}
.phase .tag i{font-style:normal;display:block;margin-top:6px;font-size:11px}
.done{color:var(--accent-2)} .now{color:var(--warn)} .next{color:var(--ink-3)}

/* ---------- tables / code ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th,.tbl td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}
.tbl th{font-family:var(--m);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}
.tbl td:first-child{font-family:var(--m);font-size:13.5px;color:var(--ink)}
code,pre{font-family:var(--m)}
code{background:var(--panel);border:1px solid var(--line);border-radius:6px;
  padding:2px 6px;font-size:13.5px;color:var(--accent-2)}
pre{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:18px;overflow-x:auto;font-size:13.5px;line-height:1.6;color:var(--ink-2)}
pre code{background:none;border:0;padding:0;color:inherit}

/* ---------- docs layout ---------- */
.docs{display:grid;grid-template-columns:236px 1fr;gap:48px;align-items:start}
.toc{position:sticky;top:88px;border-left:1px solid var(--line);padding-left:18px}
.toc a{display:block;font-size:14px;color:var(--ink-3);padding:5px 0;transition:color .15s}
.toc a:hover,.toc a.on{color:var(--ink)}
.toc .h{font-family:var(--m);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin:18px 0 6px}
.doc h2{margin:44px 0 14px;scroll-margin-top:96px}
.doc h3{margin:28px 0 10px;scroll-margin-top:96px}
.doc p{color:var(--ink-2);margin:12px 0}
.doc ul{color:var(--ink-2);padding-left:20px;margin:12px 0}
.doc li{margin:6px 0}

/* ---------- footer ---------- */
footer.site{padding:64px 0 40px;background:var(--bg-2)}
.fgrid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:36px}
footer h4{font-family:var(--m);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:14px;font-weight:600}
footer a{display:block;font-size:14.5px;color:var(--ink-2);padding:4px 0}
footer a:hover{color:var(--ink)}
.fbot{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  font-size:13px;color:var(--ink-3)}

/* ---------- reveal ---------- */
.rv{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .g3,.g4,.stats,.fgrid{grid-template-columns:repeat(2,1fr)}
  .docs{grid-template-columns:1fr;gap:26px}
  .toc{position:static;border-left:0;border-top:1px solid var(--line);padding:16px 0 0}
  .burger{display:block}
  .nav nav{position:fixed;inset:64px 0 auto;flex-direction:column;align-items:stretch;
    gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 24px 18px;
    margin:0;display:none}
  .nav nav.open{display:flex}
  .nav nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav nav a[aria-current=page]::after{display:none}
  .nav nav .btn{margin-top:12px;justify-content:center}
}
@media(max-width:560px){
  .g2,.g3,.g4,.stats,.fgrid{grid-template-columns:1fr}
  .pillar,.phase,.step{grid-template-columns:1fr;gap:10px}
  section{padding:60px 0}
}