body{font-family:system-ui,-apple-system,BlinkMacSystemFont,sans-serif;background:#f5f7fa;margin:0;padding:1.5rem}h1{text-align:center;margin-bottom:1.5rem;color:#111827}.card{background:#fff;border-radius:12px;padding:1.2rem;margin:1rem auto;max-width:320px;box-shadow:0 6px 18px #00000014;border-left:6px solid #2563eb;font-size:1.1rem;line-height:1.4;text-align:center;transition:transform .2s ease,box-shadow .2s ease}.card:hover{transform:translateY(-2px);box-shadow:0 10px 22px #0000001f}.on{color:#16a34a;font-weight:700}.off{color:#dc2626;font-weight:700}.alert{margin-top:.5rem;padding:.25rem .5rem;border-radius:6px;background:#fff7ed;color:#c2410c;font-weight:600;font-size:.9rem}