:root{color-scheme:dark;--bg: #0f172a;--surface: #1e293b;--text: #e2e8f0;--muted: #94a3b8;--accent: #38bdf8}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}.app-shell{max-width:42rem;margin:0 auto;padding:1.5rem 1rem calc(1.5rem + env(safe-area-inset-bottom))}