:root{
  --bg:#0f1724;
  --card:#0b1220;
  --text:#e6eef8;
  --accent:#6ee7b7;
  --muted:#9fb3c8;
}
[data-theme="light"]{
  --bg:#f6fbff;
  --card:#ffffff;
  --text:#052034;
  --accent:#0ea5a3;
  --muted:#5b6b75;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: radial-gradient(1200px 600px at 10% 10%, rgba(110,231,183,0.06), transparent),
              radial-gradient(900px 400px at 90% 90%, rgba(99,102,241,0.04), transparent),
              var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  padding:24px;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  gap:18px;
}
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
}
.site-header h1{margin:0;font-size:1.5rem}
.tagline{margin:0;color:var(--muted)}
nav a{color:var(--accent);text-decoration:none;margin-left:12px;font-weight:600}
main{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;align-items:start}
.card{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.03);
  padding:18px;border-radius:12px;backdrop-filter: blur(6px);
}
.spark-area{
  font-size:48px;width:120px;height:120px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  margin-top:12px;cursor:pointer;border:1px dashed rgba(255,255,255,0.06);
  user-select:none;
}
button{
  padding:10px 14px;border-radius:10px;border:0;background:linear-gradient(90deg,var(--accent), #60a5fa);
  color:var(--bg);font-weight:700;cursor:pointer;
  box-shadow:0 6px 18px rgba(2,6,23,0.45);
}
footer{opacity:0.85;color:var(--muted)}
@media (max-width:600px){
  .site-header{flex-direction:column;align-items:flex-start}
}