:root{color-scheme:light;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;background:#f7f9f8;color:#172b27;-webkit-text-size-adjust:100%}
*{box-sizing:border-box}body{margin:0;min-height:100vh}button,input,select{font:inherit}button,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}[hidden]{display:none!important}
.shell{width:min(100% - 32px,480px);min-height:100vh;margin:0 auto;display:flex;flex-direction:column}.brand{display:flex;gap:10px;align-items:center;padding:28px 4px 24px;font-size:13px;font-weight:750;letter-spacing:.12em}.brand-mark{color:#287363;font-size:29px;line-height:1}
.tool{background:#fff;border:1px solid #e3eae6;border-radius:22px;padding:28px 22px 22px;box-shadow:0 8px 28px rgb(13 41 33 / 3.5%)}.eyebrow{margin:0 0 9px;color:#526660;font-weight:700;font-size:11px;letter-spacing:.15em}h1{margin:0;font-size:clamp(22px,5.4vw,28px);font-weight:750;letter-spacing:-.015em;line-height:1.35}.intro{margin:9px 0 25px;color:#526660;font-size:14px}.hint{font-size:12px;color:#526660;line-height:1.7;margin:10px 0}.product{min-width:0;margin:20px 0 12px;padding:14px 0 0;border:0;border-top:1px solid #e3eae6}.product legend{padding:0 10px 0 0;font-size:14px;font-weight:750}.fields{display:grid;grid-template-columns:1fr 1.45fr;gap:12px}.fields>div{min-width:0}label{display:block;margin:0 0 7px;font-size:12px;font-weight:650;color:#526660}.quantity-row{display:grid;grid-template-columns:minmax(0,1fr) 64px;gap:6px}input,select{min-width:0;width:100%;min-height:48px;border:1px solid #b7c9c1;border-radius:10px;background:#fff;color:#172b27;padding:10px 9px;font-size:16px;font-variant-numeric:tabular-nums}select{padding:10px 4px}input::placeholder{color:#7c8a84;font-size:13px}input[aria-invalid=true],select[aria-invalid=true]{border:2px solid #a32b26}.field-error{margin:5px 0 0;color:#a32b26;font-size:12px;line-height:1.5}.field-error:empty{display:none}.error-summary{background:#fff3f1;border-radius:10px;padding:12px;color:#922721;font-size:13px;line-height:1.7}
.primary{width:100%;min-height:56px;margin-top:12px;border:1px solid #287363;border-radius:14px;background:#287363;color:#fff;font-size:17px;font-weight:750}.primary:hover{background:#205c50}.reset{display:block;margin:8px auto 0;border:0;border-radius:12px;background:transparent;color:#315d52;min-height:48px;padding:0 20px;font-size:13px}.reset:hover{background:#f1f6f3}:is(button,input,select,summary):focus-visible{outline:3px solid #b3780b;outline-offset:3px}#result-title:focus{outline:2px solid #287363;outline-offset:5px;border-radius:3px}
.result{margin-top:16px;padding:20px 16px;background:#f5f8f6;border:1px solid #e3eae6;border-radius:16px;overflow-wrap:anywhere}.result-basis{margin:0 0 8px;color:#526660;font-size:12px}h2{margin:0;color:#205c50;font-size:23px;line-height:1.5}.prices{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0 14px}.prices>div{min-width:0}dt{font-size:12px;color:#526660}dd{margin:5px 0 0;font-size:19px;font-weight:750;font-variant-numeric:tabular-nums}.difference{margin:0;font-size:14px;line-height:1.7;font-weight:650}details{margin-top:12px;border-top:1px solid #dce7e0;padding-top:6px;color:#526660;font-size:12px;line-height:1.8}summary{min-height:44px;align-content:center;cursor:pointer}details p{margin:6px 0}
.notice{border-top:1px solid #eef2ef;margin:18px 0 0;padding-top:17px;color:#526660;font-size:11px;line-height:1.8}footer{margin-top:auto;padding:34px 8px 26px;text-align:center;font-size:11px;color:#526660}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
@media(max-width:360px){.shell{width:calc(100% - 24px)}.tool{padding:23px 16px 19px}.fields{gap:10px;grid-template-columns:1fr 1.5fr}.quantity-row{grid-template-columns:minmax(0,1fr) 58px;gap:5px}.result{padding:18px 12px}dd{font-size:18px}}
@media(prefers-reduced-motion:no-preference){button{transition:background-color .12s ease}}