:root{
  --bg:#0b1226;
  --card:#111a38;
  --accent:#7fc1ff;
  --text:#eaf2ff;
  --muted:#b8c7e6;
  --link:#ffd166;
}
:root{
  --bg:#0b1226; --card:#111a38; --accent:#7fc1ff; --text:#eaf2ff;
  --muted:#b8c7e6; --link:#ffd166;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

/* Layout */
.container{max-width:1100px;margin:0 auto;padding:24px}
.header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;background:#0d1731;position:sticky;top:0;z-index:10;border-bottom:1px solid rgba(255,255,255,.08)}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.3px}
.brand img{width:36px;height:36px}
.nav{display:flex;gap:12px;flex-wrap:wrap}
.nav a{padding:8px 12px;border-radius:10px;background:rgba(255,255,255,.05)}

.hero{display:grid;grid-template-columns:1.2fr 1fr;gap:32px;align-items:center;padding:32px 0}
.hero h1{font-size:clamp(28px,4.8vw,48px);line-height:1.05;margin:0}
.hero p{font-size:clamp(16px,2.5vw,20px);color:var(--muted)}

.card{background:var(--card);border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:20px;box-shadow:0 8px 24px rgba(0,0,0,.25)}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.planet-card{display:flex;flex-direction:column;gap:12px}
.planet-card img{width:100%;aspect-ratio:1/1;border-radius:14px;background:#0b132c;object-fit:cover;border:1px solid rgba(255,255,255,.06)}

.btn{display:inline-block;background:linear-gradient(180deg,#2a3c7a,#1f2d5a);color:white;border:none;padding:10px 14px;border-radius:10px;font-weight:700;box-shadow:0 4px 10px rgba(0,0,0,.3)}
.btn:hover{filter:brightness(1.1)}

.footer{padding:24px;color:var(--muted);text-align:center;border-top:1px solid rgba(255,255,255,.08);margin-top:32px}
.fact-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:16px 0}
.fact{background:#0c1430;border-radius:12px;padding:12px;border:1px solid rgba(255,255,255,.08)}
.table{width:100%;border-collapse:collapse;margin-top:10px}
.table th,.table td{border:1px solid rgba(255,255,255,.12);padding:8px;text-align:left}
.back{margin:12px 0 0}

/* Responsive YouTube embed */
.video{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:12px;border:1px solid rgba(255,255,255,.08)}
.video iframe{position:absolute;inset:0;width:100%;height:100%}

@media (max-width:900px){
  .hero{grid-template-columns:1fr}
  .nav{display:none}
}