*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui;background:#060d18;color:#d8f7ff}
.hero{height:180px;background:url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat;border-bottom:1px solid #1f4f74}
.hero-overlay{height:100%;padding:28px;background:linear-gradient(90deg,rgba(4,10,20,.85),rgba(4,10,20,.35));display:flex;flex-direction:column;justify-content:flex-end}
.hero h1{margin:0;font-size:32px}.hero p{margin:4px 0 0;color:#93eaff}
.layout{display:grid;grid-template-columns:280px 1fr;gap:14px;padding:14px}
.panel{background:#0b1a2d;border:1px solid #2a6a94;border-radius:14px;padding:14px;box-shadow:0 0 0 1px rgba(77,227,255,.08) inset}
.left-rail h3{margin:8px 0}.left-rail ul{margin:8px 0 14px 18px;padding:0}.left-rail li{margin:6px 0;color:#9feeff}
.left-rail summary{cursor:pointer;color:#c7f9ff}
.main-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.main-grid h2{margin:0 0 8px;font-size:20px}.sub{margin:0 0 10px;color:#8ddcf2}
hr{border:none;border-top:1px solid #245679;margin:12px 0}
@media (max-width:960px){.layout{grid-template-columns:1fr}.main-grid{grid-template-columns:1fr}.hero{height:140px}.hero h1{font-size:26px}}