:root{--bg: #0f1115;--panel: #171a21;--border: #262b36;--text: #e6e8ec;--muted: #9aa3b2;--accent: #4f7cff}*{box-sizing:border-box}html,body,#app{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}.shell{max-width:720px;margin:0 auto;padding:4rem 1.5rem}h1{font-size:2.5rem;margin:0 0 .25rem;letter-spacing:-.02em}.lead{color:var(--muted);margin:0 0 2rem}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:1.25rem 1.5rem}.card h2{font-size:.8rem;margin:0 0 .75rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.06em}.card ul{margin:0;padding-left:1rem}.card li{margin:.25rem 0}code{font-family:ui-monospace,JetBrains Mono,Cascadia Code,monospace;color:var(--accent)}.err{color:#ff6b6b}