:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; background: #111827; color: #e5e7eb; }
main { max-width: 900px; margin: 2rem auto; padding: 2rem; background: #1f2937; border-radius: 12px; }
label { display: block; margin: 1rem 0; font-weight: 600; }
input, textarea, select, button { box-sizing: border-box; width: 100%; margin-top: .35rem; padding: .65rem; border-radius: 6px; border: 1px solid #64748b; font: inherit; }
button { cursor: pointer; background: #2563eb; color: white; font-weight: 700; border: 0; }
.row, .actions { display: flex; gap: 1rem; }
.row > label, .actions > button { flex: 1; }
#status { min-height: 1.5rem; white-space: pre-wrap; }
#plot { max-width: 100%; background: white; }
pre { overflow: auto; padding: 1rem; background: #0f172a; }
@media (max-width: 600px) { .row, .actions { display: block; } }