:root{color-scheme:dark;--bg:#0f172a;--panel:#1e293b;--text:#f8fafc;--muted:#94a3b8;--accent:#38bdf8;--accent-strong:#0ea5e9;--danger:#f87171;--ok:#4ade80}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:radial-gradient(circle at top,#1e3a5f 0,var(--bg) 55%);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}button{font:inherit}