body{margin:0;padding:16px;background:#f1f1f1;color:#303030;font:14px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,sans-serif}
.card{background:#fff;border-radius:12px;padding:16px;max-width:560px;box-shadow:0 1px 0 rgba(26,26,26,.07),0 0 0 1px rgba(26,26,26,.06)}
h1{font-size:15px;margin:0 0 12px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
label{display:flex;flex-direction:column;gap:4px;font-weight:600}
input{padding:8px;border:1px solid #c9c9c9;border-radius:8px;font-size:14px;width:100%;box-sizing:border-box}
.result{display:flex;gap:12px;margin-top:16px;flex-wrap:wrap}
.result div{flex:1;min-width:140px;background:#f7f7f7;border-radius:10px;padding:12px}
.result span{display:block;color:#616161;font-size:12px}
.result strong{font-size:22px}
.gain{color:#0a7a3d}.loss{color:#c0202b}
.hint{color:#616161;font-size:12px;margin:12px 0 0}