* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: sans-serif; max-width: 500px; margin: 30px auto; padding: 0 16px; }
h1 { font-size: 1.3em; margin-bottom: 16px; }
label { display: block; font-size: 0.85em; margin-top: 12px; color: #666; }
select, input { width: 100%; padding: 8px; border: 1px solid #ccc; font-size: 1em; margin-top: 2px; }
select:disabled, input:disabled { background: #f5f5f5; color: #aaa; }
button { padding: 10px 24px; background: #2a2; color: #fff; border: none; cursor: pointer; font-size: 1em; margin-top: 4px; }
button:disabled { background: #999; cursor: default; }
.result { margin-top: 20px; padding: 16px; background: #f0f0f0; display: none; }
.price { font-size: 2em; font-weight: 700; }
.summary-line { margin-top: 4px; font-size: 0.9em; color: #555; }