:root{--bg:#0f1419;--panel:#1a2332;--text:#e8eef6;--muted:#8b9bb0;--accent:#3d9cf0;--line:#2a3545}
*{box-sizing:border-box}body{margin:0;font-family:"Segoe UI","Helvetica Neue",sans-serif;background:radial-gradient(1200px 600px at 10% -10%,#1c2b3d 0%,var(--bg) 55%);color:var(--text);line-height:1.55;min-height:100vh}
header,main,footer{max-width:840px;margin:0 auto;padding:1.5rem}
header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}
.brand{font-weight:700;color:var(--accent);text-decoration:none}nav a{color:var(--muted);margin-left:1rem;text-decoration:none}
h1{font-size:2rem;margin:2rem 0 .75rem}p{color:var(--muted)}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:1.25rem 1.5rem;margin:1.5rem 0}
.mono{font-family:Consolas,monospace;color:#b7d7ff}footer{border-top:1px solid var(--line);font-size:.9rem;color:var(--muted)}