* { margin:0; padding:0; box-sizing:border-box; font-family:Segoe UI, sans-serif; }
body { background:#1e1e1e; color:#fff; }
.container { max-width:800px; margin:0 auto; padding:1rem; }
.card { background:#2d2d2d; padding:1.5rem; border-radius:12px; margin:1rem 0; box-shadow:0 4px 12px rgba(0,0,0,0.3); }
input, select, button { width:100%; padding:0.75rem; margin:0.5rem 0; border:none; border-radius:8px; }
input, select { background:#3a3a3a; color:#fff; }
button { background:#ff4444; color:white; font-weight:bold; cursor:pointer; }
button:hover { background:#cc3333; }
pre { background:#111; padding:1rem; border-radius:8px; white-space:pre-wrap; font-size:0.9rem; }