:root{
  --bg:#0b1220; --bg2:#0f1b33; --card:#0f1b33;
  --text:#e8f1ff; --muted:#9fb0c8; --accent:#22d3ee; --accent2:#20c6b7; --stroke:#1e2a44;
  color-scheme:dark;
}
[data-theme="light"]{
  --bg:#ffffff; --bg2:#f7f9fc; --card:#ffffff;
  --text:#0f172a; --muted:#4b5563; --accent:#0066cc; --accent2:#00a6a6; --stroke:#e5e7eb;
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font:16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, 'Helvetica Neue', Arial}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:auto;padding:24px}
nav{position:sticky;top:0;background:rgba(11,18,32,.85);backdrop-filter:saturate(1.2) blur(6px);border-bottom:1px solid var(--stroke);z-index:50}
[data-theme="light"] nav{background:rgba(255,255,255,.9)}
.nav-inner{display:flex;align-items:center;gap:16px;justify-content:space-between;padding:12px 0}
.brand{display:flex;gap:10px;align-items:center;color:var(--text);font-weight:700}
.brand-dot{width:10px;height:10px;border-radius:999px;background:var(--accent)}
.menu{display:flex;gap:18px;align-items:center}
.btn{display:inline-block;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#00131a;padding:10px 16px;border-radius:10px;border:0;font-weight:600}
.btn.alt{background:transparent;color:var(--text);border:1px solid var(--stroke)}
.hero{background:linear-gradient(120deg,var(--bg2),transparent 60%);border-bottom:1px solid var(--stroke)}
.grid{display:grid;gap:18px}
.feature{grid-template-columns:1.05fr .95fr;align-items:center}
.card{background:var(--card);border:1px solid var(--stroke);border-radius:12px;padding:18px}
h1{font-size:40px;line-height:1.2;margin:0 0 8px}
h2{font-size:26px;margin:0 0 8px}
h3{font-size:20px;margin:0 0 8px}
.lead{color:var(--muted);margin:0 0 16px}
.section-title{margin:26px 0 12px}
.theme-toggle{border:1px solid var(--stroke);background:transparent;color:var(--text);border-radius:999px;padding:8px 12px;cursor:pointer}
input,select,textarea{width:100%;padding:10px;border-radius:10px;border:1px solid var(--stroke);background:transparent;color:var(--text)}
label{font-weight:600;font-size:14px}
form .grid{grid-template-columns:1fr 1fr}
footer{border-top:1px solid var(--stroke);margin-top:24px;background:var(--bg2)}
.small{font-size:14px;color:var(--muted)}
img.rounded{border-radius:16px;border:1px solid var(--stroke);width:100%}
.badge{display:inline-block;font-size:12px;border:1px solid var(--stroke);padding:2px 8px;border-radius:999px;color:var(--muted)}
.cards{grid-template-columns:repeat(3,1fr)}
@media (max-width:900px){
  .feature{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  form .grid{grid-template-columns:1fr}
}