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optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.block{display:block}.grid{display:grid}}:root{--ink:#17211b;--muted:#5f6b63;--paper:#f6f5ef;--card:#fff;--line:#dfe3dc;--green:#2f6848;--green-dark:#214c35;--lime:#dce8c7;--orange:#eaa867;--shadow:0 18px 50px #23342914}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);margin:0;font-family:Yu Gothic UI,Hiragino Kaku Gothic ProN,Meiryo,sans-serif;line-height:1.75}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button,a{touch-action:manipulation}h1,h2,h3,p{margin-top:0}h1,h2,h3{letter-spacing:-.025em;line-height:1.25}h1{font-size:clamp(2.25rem,7vw,5.25rem)}h2{font-size:clamp(1.5rem,3vw,2.25rem)}h3{font-size:1.18rem}.shell{width:min(1120px,100% - 32px);margin-inline:auto}.skip-link{z-index:99;background:var(--ink);color:#fff;border-radius:8px;padding:10px 16px;position:fixed;top:-80px;left:16px}.skip-link:focus{top:16px}.site-header{z-index:40;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#f6f5eff0;border-bottom:1px solid #17211b14;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:20px;min-height:72px;display:flex}.brand{letter-spacing:-.03em;font-size:1.08rem;font-weight:800}.brand span{color:var(--green)}.site-header ul,.site-footer ul{margin:0;padding:0;list-style:none}.site-header ul{gap:8px;display:flex}.site-header nav a{border-radius:999px;padding:10px 13px;font-size:.9rem;font-weight:700;display:block}.site-header nav a:hover,.site-header nav a:focus-visible{box-shadow:0 0 0 1px var(--line);background:#fff}.hero{background:linear-gradient(180deg,#eef1e5 0,var(--paper) 100%);padding:clamp(40px,5.5vw,72px) 0 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20px;font-weight:800;display:inline-flex}.primary-button{background:var(--green);color:#fff}.primary-button:hover,.primary-button:focus-visible{background:var(--green-dark)}.secondary-button{border-color:var(--line);color:var(--ink);background:#fff}.primary-button:focus-visible,.secondary-button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible,a:focus-visible{outline-offset:3px;outline:3px solid #eaa867a6}.section-block{padding:72px 0}.section-heading{justify-content:space-between;align-items:end;gap:20px;margin-bottom:26px;display:flex}.section-heading h2{margin:6px 0 0}.section-heading>p{color:var(--muted);font-weight:700}.search-section{padding-top:40px}.search-box{display:block}.search-box input{border:1px solid var(--line);width:100%;min-height:62px;box-shadow:var(--shadow);background:#fff;border-radius:14px;padding:0 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strong{margin:24px 0 10px;font-size:1.45rem;display:block}.category-card p{color:var(--muted)}.category-card i{font-size:1.5rem;font-style:normal;position:absolute;bottom:20px;right:24px}.purpose-panel{background:var(--ink);color:#fff;border-radius:22px;grid-template-columns:.8fr 1.2fr;gap:50px;padding-inline:clamp(25px,5vw,64px);display:grid}.purpose-panel ul{margin:0;padding:0;list-style:none}.purpose-panel li+li{border-top:1px solid #ffffff26}.purpose-panel a{justify-content:space-between;padding:15px 0;font-weight:800;display:flex}.purpose-panel a:after{content:"→";color:var(--orange)}.page-shell{padding-top:28px;padding-bottom:90px}.breadcrumb ol{color:var(--muted);flex-wrap:wrap;gap:8px;margin:0;padding:0;font-size:.84rem;list-style:none;display:flex}.breadcrumb li:not(:last-child):after{content:"/";color:#99a29b;margin-left:8px}.breadcrumb a{text-underline-offset:3px;text-decoration:underline}.category-hero,.tool-hero{max-width:830px;padding:55px 0 20px}.category-hero 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textarea{resize:vertical;padding:14px;font-weight:500}.unit{color:var(--muted);font-weight:700;position:absolute;top:50%;right:14px;transform:translateY(-50%)}.result-region{margin-top:28px}.result-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:28px;display:grid}.result-card{background:#eef3e8;border:1px solid #d8e2ce;border-radius:14px;min-height:135px;padding:20px}.result-card span{color:var(--muted);font-size:.82rem;font-weight:800;display:block}.result-card strong{color:var(--green-dark);margin-top:8px;font-size:clamp(1.55rem,4vw,2.3rem);line-height:1.2;display:block}.result-card p{color:var(--muted);margin:10px 0 0;font-size:.83rem}.error-message{color:#8b341b;background:#fff0e8;border-radius:10px;padding:14px;font-weight:800}.result-explanation{border-left:4px solid var(--orange);background:#fff;padding:24px 28px}.result-explanation h2{font-size:1.25rem}.result-explanation p{color:var(--muted);margin-bottom:0}.content-layout{grid-template-columns:minmax(0,1fr) 300px;gap:50px;padding:70px 0 10px;display:grid}.article-content section{padding:0 0 42px}.article-content h2{font-size:1.65rem}.article-content p,.article-content li{color:#455047}.article-content li+li{margin-top:8px}.formula{background:#eceee9;border-radius:9px;padding:14px 18px;font-weight:800;color:var(--ink)!important}.side-note{border:1px solid var(--line);background:#fff;border-radius:14px;align-self:start;padding:24px;position:sticky;top:100px}.side-note h2{font-size:1.15rem}.side-note p:last-child{color:var(--muted);font-size:.9rem}.faq-list{border-top:1px solid var(--line)}.faq-list details{border-bottom:1px solid var(--line)}.faq-list summary{cursor:pointer;padding:18px 4px;font-weight:800}.faq-list details p{padding:0 4px 18px}.legal-content{max-width:760px;padding:60px 0}.legal-content h1{margin:10px 0 18px;font-size:clamp(2.3rem,6vw,4.5rem)}.legal-content h2{margin-top:50px;font-size:1.45rem}.notice{border:1px solid var(--line);background:#fff;border-radius:10px;padding:16px}.not-found{min-height:60vh;padding-block:110px}.not-found h1{margin:12px 0 20px}.not-found p{color:var(--muted);margin-bottom:28px}.site-footer{border-top:1px solid var(--line);background:#e9ebe4;padding:62px 0 25px}.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:50px;display:grid}.footer-grid h2{text-transform:uppercase;letter-spacing:.12em;font-size:.8rem}.footer-grid li+li{margin-top:8px}.footer-grid a{text-underline-offset:4px;-webkit-text-decoration:underline #b6bdb6;text-decoration:underline #b6bdb6}.footer-brand{font-size:1.3rem}.copyright{width:min(1120px,100% - 32px);color:var(--muted);border-top:1px solid #cfd4cd;margin:50px auto 0;padding-top:18px;font-size:.78rem}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media 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ul{flex-direction:column;gap:6px;margin:0;padding:0;list-style:none;display:flex}.check-flagged-group li{color:#455047;align-items:baseline;gap:8px;font-size:.92rem;display:flex}.check-flagged-symbol{flex:none;font-weight:900}.check-flagged-symbol.is-missing{color:var(--orange)}.check-flagged-symbol.is-partial{color:var(--muted)}.check-guide-links,.check-starter-kit-cta{margin-top:32px}@media (max-width:480px){.check-question{flex-direction:column;align-items:flex-start}.check-answers{justify-content:space-between;width:100%}.check-answer{flex:1;min-width:0}}.ec-diagram{flex-wrap:wrap;justify-content:space-between;gap:20px 12px;margin-top:28px;padding-top:4px;display:flex;position:relative}.ec-diagram-line{background:var(--line);z-index:0;height:2px;position:absolute;top:38px;left:38px;right:38px}.ec-node{z-index:1;text-align:center;width:15%;min-width:92px;color:var(--ink);flex-direction:column;align-items:center;gap:8px;display:flex;position:relative}.ec-node-icon{border:2px solid 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