/* Certeus design system — lightweight, accessible, fast */
:root{
  --bg:#0b0b0b;
  --bg-elev:#121212;
  --text:#ffffff;
  --muted:#b3b3b3;
  --line:#1f1f1f;
  --brand:#10b981; /* emerald */
  --brand-2:#22d3ee; /* cyan */
  --accent:#a78bfa; /* violet */
  --danger:#ef4444;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
@media (prefers-color-scheme: light){
  :root{ --bg:#f7f7f8; --bg-elev:#ffffff; --text:#0b0b0b; --muted:#303030; --line:#e9e9ec; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
svg{vertical-align:middle}
a{color:inherit}

/* Layout */
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.wrap{max-width:860px;margin:0 auto;padding:64px 20px}
.section{padding:72px 0;border-top:1px solid var(--line)}
.section:first-of-type{border-top:none}

/* Header */
.header{position:sticky;top:0;z-index:50;background:linear-gradient(180deg,rgba(11,11,11,.9),rgba(11,11,11,.7) 80%,transparent);backdrop-filter:saturate(1.2) blur(8px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand svg{width:28px;height:28px}
.brand-name{font-weight:700;letter-spacing:.2px}
.nav{display:flex;gap:14px;align-items:center}
.nav a{padding:10px 12px;border-radius:10px;text-decoration:none;color:var(--muted)}
.nav a:hover,.nav a:focus{color:var(--text);background:var(--bg-elev)}
.nav-cta{background:var(--brand);color:#000;font-weight:600}

/* Hero */
.hero{padding:96px 0 40px;background:
  radial-gradient(900px 300px at 20% -20%, rgba(34,211,238,.20), transparent 60%),
  radial-gradient(900px 300px at 80% -20%, rgba(16,185,129,.20), transparent 60%);
}
.hero h1{font-size:clamp(36px,6vw,56px);line-height:1.05;margin:0 0 12px}
.hero p.lead{font-size:clamp(18px,2.4vw,22px);color:var(--muted);margin:0 0 24px}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}

/* Cards */
.cards{display:grid;grid-template-columns:repeat(12,1fr);gap:16px;margin-top:24px}
.card{grid-column:span 4;background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px 16px;box-shadow:var(--shadow)}
.card h3{margin:0 0 6px;font-size:18px}
.card p{margin:0;color:var(--muted)}
.card.big{grid-column:span 6}
@media (max-width:900px){.card,.card.big{grid-column:span 12}}

/* Buttons */
.btn{display:inline-flex;gap:8px;align-items:center;justify-content:center;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--bg-elev);color:var(--text);text-decoration:none;font-weight:600}
.btn:hover,.btn:focus{border-color:transparent;outline:none;box-shadow:0 0 0 2px rgba(34,211,238,.25)}
.btn.primary{background:var(--brand);color:#000;border-color:transparent}
.btn.ghost{background:transparent}
.btn.badge{padding:8px 10px;border-radius:999px;font-size:13px}

/* Feature list */
.features{display:grid;grid-template-columns:repeat(12,1fr);gap:14px;margin-top:14px}
.feature{grid-column:span 3;border:1px dashed var(--line);border-radius:12px;padding:12px}
.feature strong{display:block}
@media (max-width:900px){.feature{grid-column:span 6}}
@media (max-width:640px){.feature{grid-column:span 12}}

/* Footer */
.footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted)}
.footer .row{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}

/* Utilities */
.muted{color:var(--muted)}
.kbd{font:600 12px ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--bg-elev);border:1px solid var(--line);padding:2px 6px;border-radius:6px}
.pill{display:inline-block;padding:6px 10px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* Page-specific tweaks */
.landing-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px;margin-top:18px}
.landing-grid .slot{grid-column:span 6}
.landing-grid .slot:nth-child(3){grid-column:span 12}
@media (max-width:900px){.landing-grid .slot{grid-column:span 12}}

.badge-beta{background:linear-gradient(90deg,var(--brand),var(--brand-2));color:#000;padding:4px 8px;border-radius:999px;font-weight:700}

/* Reduced motion */
@media (prefers-reduced-motion:no-preference){
  .btn{transition:transform .18s ease, box-shadow .18s ease}
  .btn:hover{transform:translateY(-1px)}
}