:root{
  --blue:#0e5eff;
  --blue-dark:#0a43c1;
  --ink:#0a1633;
  --muted:#667085;
  --line:#e8edf5;
  --bg:#ffffff;
  --soft:#f7f9ff;
  --radius:14px;
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
a{color:var(--blue);text-decoration:none}
.container{max-width:1020px;margin:0 auto;padding:0 24px}
.header{
  position:sticky;
  top:16px;
  z-index:100;
  padding:0 20px;
  pointer-events:none;
}
.nav{
  pointer-events:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:56px;
  gap:16px;
  max-width:1020px;
  margin:0 auto;
  padding:0 18px 0 14px;
  background:rgba(255, 255, 255, 0.85);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid rgba(232, 237, 245, 0.95);
  border-radius:999px;
  box-shadow:0 10px 30px rgba(10, 22, 51, 0.05), 0 1px 3px rgba(10, 22, 51, 0.03);
  transition:all .25s ease;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--ink);
  font-weight:700;
  font-size:15px;
  letter-spacing:-.01em;
  padding-left:4px;
}
.brand:hover{text-decoration:none}
.brand img{width:30px;height:30px;object-fit:contain;border-radius:8px}
.links{display:flex;align-items:center;gap:4px}
.links a{
  color:var(--muted);
  font-size:13.5px;
  font-weight:500;
  padding:6px 12px;
  border-radius:999px;
  transition:all .18s ease;
}
.links a:hover{
  color:var(--ink);
  background:rgba(14, 94, 255, 0.06);
  text-decoration:none;
}
.links a.active{
  color:var(--blue);
  background:rgba(14, 94, 255, 0.09);
  font-weight:600;
}
.actions{display:flex;align-items:center;gap:8px}
.lang{
  display:flex;
  border:1px solid var(--line);
  border-radius:999px;
  overflow:hidden;
  background:#fff;
}
.lang button{
  border:0;
  background:transparent;
  padding:5px 9px;
  font-size:11.5px;
  font-weight:700;
  color:var(--muted);
  cursor:pointer;
  transition:all .15s ease;
}
.lang button.active{background:var(--blue);color:#fff}
.theme{
  display:flex;
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
  padding:2px;
  gap:2px;
}
.theme button{
  border:0;
  background:transparent;
  padding:4px 8px;
  font-size:13px;
  line-height:1;
  border-radius:999px;
  color:var(--muted);
  cursor:pointer;
  transition:all .15s ease;
  position:relative;
}
.theme button.active{background:var(--blue);color:#fff}
.theme button:hover{color:var(--blue)}
.theme button.active:hover{color:#fff}
.theme button::after{
  content:attr(data-tip);
  position:absolute;
  top:calc(100% + 10px);
  left:50%;
  transform:translateX(-50%) translateY(4px);
  background:#0b1530;
  color:#fff;
  font-size:12px;
  font-weight:600;
  padding:6px 10px;
  border-radius:8px;
  white-space:nowrap;
  opacity:0;
  pointer-events:none;
  transition:opacity .15s ease,transform .15s ease;
  z-index:200;
  box-shadow:0 8px 20px rgba(10,22,51,.2);
}
.theme button:hover::after,.theme button:focus-visible::after{
  opacity:1;
  transform:translateX(-50%) translateY(0);
}
.hamburger{
  display:none;
  border:1px solid var(--line);
  background:#fff;
  border-radius:999px;
  width:36px;
  height:36px;
  padding:0;
  align-items:center;
  justify-content:center;
  font-size:16px;
  cursor:pointer;
  transition:all .15s ease;
}
.hamburger:hover{border-color:var(--blue);color:var(--blue)}
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:11px 22px;font-weight:600;font-size:14px;border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark);color:#fff;text-decoration:none}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue);text-decoration:none}
.btn-sm{padding:8px 14px;font-size:13px}
.hero{padding:80px 0 60px;text-align:center}
.hero img.logo-big{width:72px;height:72px;object-fit:contain;margin-bottom:16px}
h1{font-size:clamp(32px,4.5vw,48px);line-height:1.1;letter-spacing:-.03em;margin:0 0 12px;font-weight:800}
h1 span{color:var(--blue)}
.lead{color:var(--muted);font-size:17px;max-width:620px;margin:0 auto}
.cta-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.section{padding:64px 0;border-top:1px solid var(--line)}
.section-soft{background:var(--soft)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.code{background:#0b1530;color:#cfe0ff;border-radius:12px;padding:18px;font-family:ui-monospace,Consolas,monospace;font-size:13px;line-height:1.6;overflow:auto}
.cta-banner{background:var(--blue);color:#fff;border-radius:20px;padding:40px 28px;text-align:center}
.cta-banner p{opacity:.9}
.cta-banner .btn-primary{background:#fff;color:var(--blue)}
.kicker{color:var(--blue);font-weight:700;font-size:12px;letter-spacing:.12em;text-transform:uppercase;text-align:center}
.h2{font-size:28px;letter-spacing:-.02em;text-align:center;margin:8px 0 10px}
.sub{color:var(--muted);text-align:center;max-width:640px;margin:0 auto;font-size:16px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:32px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}
.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14.5px}
.card a{display:inline-block;margin-top:12px;font-size:14px;font-weight:600}
.center{text-align:center}
.team-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;max-width:760px;margin:28px auto 0}
.team-grid .founder{margin:0;max-width:none}
.founder{border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:flex;gap:16px;align-items:center;max-width:520px;margin:28px auto 0}
.avatar{width:52px;height:52px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
.social-row{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.social-row a{border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:13px;color:var(--ink)}
.post-list{display:grid;gap:12px;margin-top:28px}
.post-row{border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;display:flex;justify-content:space-between;gap:12px;align-items:center;background:#fff;transition:border-color .2s ease}
.post-row:hover{border-color:var(--blue)}
.post-row small{color:var(--muted)}
.form{border:1px solid var(--line);border-radius:var(--radius);padding:28px;background:#fff;text-align:left}
.form label{font-size:13px;font-weight:600;display:block;margin:12px 0 6px;color:var(--ink)}
.form input,.form textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:10px;font-size:14px;font-family:inherit;transition:border-color .15s ease, box-shadow .15s ease}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(14,94,255,0.12)}
.form textarea{min-height:120px;resize:vertical}
footer{
  margin-top:auto;
  padding:40px 20px 36px;
  background:transparent;
  border-top:none;
}
.footer-pill{
  max-width:1120px;
  margin:0 auto;
  background:rgba(255, 255, 255, 0.92);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid rgba(10, 22, 51, 0.08);
  border-radius:28px;
  box-shadow:0 12px 36px rgba(10, 22, 51, 0.05), 0 2px 8px rgba(10, 22, 51, 0.02);
  padding:40px 44px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.8fr 1fr 1fr 1.2fr;
  gap:40px;
  margin-bottom:0;
}
.footer-col h4{
  font-size:12px;
  font-weight:700;
  color:var(--ink);
  text-transform:uppercase;
  letter-spacing:.08em;
  margin:0 0 16px;
}
.footer-col ul{
  list-style:none;
  padding:0;
  margin:0;
  display:grid;
  gap:11px;
}
.footer-col ul a{
  color:var(--muted);
  font-size:14px;
  transition:color .18s ease;
}
.footer-col ul a:hover{
  color:var(--blue);
  text-decoration:none;
}
.footer-brand-col .brand{
  padding-left:0;
  margin-bottom:12px;
}
.footer-brand-col p{
  color:var(--muted);
  font-size:13.5px;
  line-height:1.6;
  margin:0 0 16px;
  max-width:320px;
}
.footer-badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:12px;
  font-weight:600;
  color:var(--blue);
  background:rgba(14,94,255,0.06);
  border:1px solid rgba(14,94,255,0.16);
  padding:5px 12px;
  border-radius:999px;
}
.footer-bottom{
  max-width:1120px;
  margin:20px auto 0;
  padding:0 8px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:12.5px;
  color:var(--muted);
  flex-wrap:wrap;
  gap:12px;
}
@media(max-width:850px){
  .footer-pill{
    padding:32px 24px;
    border-radius:22px;
  }
  .footer-grid{
    grid-template-columns:1fr 1fr;
    gap:32px;
  }
}
@media(max-width:520px){
  .footer-pill{
    padding:28px 18px;
    border-radius:20px;
  }
  .footer-grid{
    grid-template-columns:1fr;
    gap:28px;
  }
  .footer-bottom{
    padding:0 4px;
    flex-direction:column;
    align-items:flex-start;
    gap:6px;
  }
}
@media(max-width:800px){
  .grid3,.split{grid-template-columns:1fr}
  .header{top:10px;padding:0 12px}
  .nav{height:52px;border-radius:18px;padding:0 12px;position:relative}
  .links{
    display:none;
    position:absolute;
    top:calc(100% + 8px);
    left:0;
    right:0;
    background:rgba(255, 255, 255, 0.96);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    flex-direction:column;
    padding:10px;
    border:1px solid var(--line);
    border-radius:18px;
    box-shadow:0 14px 34px rgba(10, 22, 51, 0.1);
    gap:4px;
  }
  .links.open{display:flex}
  .links a{
    width:100%;
    padding:10px 14px;
    border-radius:10px;
    font-size:14px;
  }
  .hamburger{display:flex}
  .hero{padding:56px 0 40px}
}
/* ===== Dark theme ===== */
html[data-theme="dark"]{
  --blue:#5b93ff;
  --blue-dark:#3b78ec;
  --ink:#eaf0ff;
  --muted:#9aa6c2;
  --line:#22304f;
  --bg:#0a1228;
  --soft:#0f1a38;
}
html[data-theme="dark"] body{background:var(--bg);color:var(--ink)}
html[data-theme="dark"] .nav{background:rgba(15,26,56,.88);border-color:var(--line)}
html[data-theme="dark"] .brand{color:var(--ink)}
html[data-theme="dark"] .links a{color:var(--muted)}
html[data-theme="dark"] .links a:hover{color:#fff;background:rgba(91,147,255,.14)}
html[data-theme="dark"] .links a.active{color:var(--blue);background:rgba(91,147,255,.16)}
html[data-theme="dark"] .lang{background:#0f1a38}
html[data-theme="dark"] .theme{background:#0f1a38}
html[data-theme="dark"] .theme button::after{background:#fff;color:#0b1530}
html[data-theme="dark"] .hamburger{background:#0f1a38;color:var(--ink)}
html[data-theme="dark"] .card,html[data-theme="dark"] .form,html[data-theme="dark"] .post-row,html[data-theme="dark"] .founder{background:#0f1a38}
html[data-theme="dark"] .btn-ghost{background:#0f1a38;color:var(--ink)}
html[data-theme="dark"] .btn-ghost:hover{color:var(--blue)}
html[data-theme="dark"] .form input,html[data-theme="dark"] .form textarea{background:#0a1228;color:var(--ink)}
html[data-theme="dark"] .footer-pill{background:rgba(15,26,56,.94);border-color:rgba(255,255,255,.08)}
html[data-theme="dark"] .paper p,html[data-theme="dark"] .paper li{color:#c4cfe8}
html[data-theme="dark"] .paper pre{background:#0f1a38;color:var(--ink)}
@media(max-width:800px){
  html[data-theme="dark"] .links{background:rgba(15,26,56,.97)}
}