.size-explain { margin: 2rem 0; padding: clamp(1rem, 3vw, 1.6rem); border: 1px solid #b9c9c9; border-radius: 16px; background: #f1f7f5; }
.size-explain h2 { margin-top: 0; }
.size-explain-input { display: flex; flex-wrap: wrap; align-items: end; gap: .7rem; margin: 1rem 0 .4rem; }
.size-explain-input label { width: 100%; font-weight: 650; }
.size-explain-input input { flex: 1 1 190px; min-width: 0; padding: .7rem .8rem; border: 1px solid #819b99; border-radius: 9px; background: #fff; color: #172726; font: inherit; }
.size-explain-input input[aria-invalid="true"] { border-color: #a34238; }
.size-explain-input input:focus-visible, .size-explain-input button:focus-visible { outline: 3px solid #326e69; outline-offset: 2px; }
.size-explain-input button { padding: .75rem 1.2rem; border: 0; border-radius: 9px; background: #195e58; color: #fff; font: inherit; font-weight: 700; cursor: pointer; }
.size-explain-input button:hover { background: #124b46; }
.size-explain #size-explain-error { color: #a02e25; font-weight: 650; }
.size-explain-list { display: grid; grid-template-columns: minmax(130px, 1fr) minmax(0, 2fr); gap: 0; margin: 1rem 0; border-top: 1px solid #b9c9c9; }
.size-explain-list dt, .size-explain-list dd { margin: 0; padding: .65rem .5rem; border-bottom: 1px solid #b9c9c9; }
.size-explain-list dt { font-weight: 700; }
.size-explain-list dd { font-variant-numeric: tabular-nums; }
@media (max-width: 530px) { .size-explain-list { grid-template-columns: 1fr; } .size-explain-list dt { border-bottom: 0; padding-bottom: .1rem; } .size-explain-list dd { padding-top: 0; } }