/* SellMath: local system type, accessible light and dark palettes. */
:root{color-scheme:light;--paper:#f7f8f4;--surface:#fff;--ink:#172e27;--muted:#52635c;--line:#d7dfd8;--control:#7a8b81;--green:#17624c;--mint:#eaf1e6;--accent:#d8f78b;--deep:#153c30;--on-deep:#e0ece3;--focus:#225cbe;--notice:#f5f0dc;--notice-ink:#625324;--error:#a12f25;--radius:20px}

*{box-sizing:border-box}
html{scroll-padding-top:24px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:inherit;text-underline-offset:4px}
button,input,select{font:inherit}
fieldset{border:0;padding:0;margin:0;min-width:0}
a,button,input,select,summary{-webkit-tap-highlight-color:transparent}
:focus-visible{outline:3px solid var(--focus);outline-offset:4px}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{line-height:1.18;letter-spacing:-.035em;text-wrap:balance}
h1{font-size:clamp(2.2rem,5vw,3.6rem);font-weight:750;margin-bottom:22px}
h2{font-size:clamp(1.4rem,3vw,1.85rem);font-weight:700;margin-bottom:24px}
h3{font-size:1.12rem;font-weight:700}
p{margin-bottom:18px}
svg{flex-shrink:0;vertical-align:middle}
.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}
.skip-link{position:absolute;z-index:10;top:-100px;left:16px;padding:12px 20px;background:var(--ink);color:var(--surface);border-radius:8px}
.skip-link:focus{top:12px}
.site-header{border-bottom:1px solid var(--line);background:var(--surface)}
.header-inner{min-height:86px;display:flex;justify-content:space-between;align-items:center;gap:12px 32px;flex-wrap:wrap;padding-block:16px}
.brand{display:inline-flex;text-decoration:none;color:var(--ink)}
.brand svg{width:192px;height:auto}
.site-header nav,.site-footer nav{display:flex;flex-wrap:wrap;gap:8px 26px}
.site-header nav a,.site-footer nav a{font-size:.85rem;font-weight:600;text-decoration:none;padding-block:8px}
.site-header nav a:hover,.site-footer nav a:hover{text-decoration:underline}
.language-switcher{display:flex;flex-wrap:wrap;gap:8px 24px;padding:18px 0;font-size:.8rem;color:var(--muted)}
.language-switcher a{padding:4px 0}
.language-switcher [aria-current]{font-weight:750;color:var(--green);text-decoration-thickness:2px}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;font-weight:750;color:var(--muted);margin-bottom:18px;line-height:1.6}
.hero{display:grid;gap:36px;padding:40px 0 56px;align-items:center}
.hero h1{font-size:clamp(2.8rem,5.7vw,4.65rem);line-height:1.07;letter-spacing:-.055em}
.hero h1 span{display:block;color:var(--green)}
.lede{max-width:750px;color:var(--muted);font-size:1.1rem;line-height:1.75}
.button{display:inline-flex;align-items:center;justify-content:space-between;gap:28px;background:var(--green);color:#fff;padding:14px 22px;border-radius:10px;font-size:.9rem;font-weight:700;text-decoration:none}
.button:hover{filter:brightness(.9)}
.hero .button{margin-top:12px}
.hero-note{font-size:.78rem;max-width:400px;color:var(--muted);margin:18px 0 0}
.hero-example{min-width:0;border-radius:24px;padding:28px;background:var(--deep);color:#fff;box-shadow:10px 10px 0 var(--mint)}
.example-top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;color:var(--accent)}
.example-top .eyebrow{color:var(--on-deep);margin:0}
.hero-example h2{font-size:1.15rem;margin-bottom:24px}
.hero-example label{color:var(--on-deep)}
.hero-example .unit{color:inherit}
.hero-example input{background:#fff;color:#172e27;border-color:#b4c6bb;font-size:1.25rem}
.hero-example input[aria-invalid=true]{outline:2px solid #ffb4ab;outline-offset:2px}
.hero-example :focus-visible,.results :focus-visible{outline-color:var(--accent)}
.hero-example dl{margin:24px 0 16px}
.example-row{display:flex;gap:16px;justify-content:space-between;align-items:baseline;padding-bottom:14px;border-bottom:1px solid #648575}
.hero-example dt{color:var(--on-deep);font-size:.85rem}
.hero-example dd{margin:0;font-weight:650;font-size:1.15rem;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.preview-total{padding-top:20px}
.preview-total dd{font-size:clamp(2.5rem,5vw,3.6rem);line-height:1.25;letter-spacing:-.04em;color:var(--accent)}
.hero-example>p,.hero-example noscript{font-size:.75rem;color:var(--on-deep)}
.hero-example>a{font-size:.8rem;color:var(--accent);font-weight:650}
.preview-error:empty{display:none}
.trust-strip{border-block:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px 24px;padding:20px 0;font-size:.82rem;color:var(--muted)}
.trust-strip span span{color:var(--green);font-weight:750;margin-right:8px}
.directory{padding-top:48px}
.category-nav{display:flex;flex-wrap:wrap;gap:10px}
.category-nav a{font-size:.85rem;font-weight:600;border:1px solid var(--control);border-radius:30px;padding:9px 16px;text-decoration:none;background:var(--surface)}
.category-nav a:hover{background:var(--mint)}
.category-section{margin-top:42px;scroll-margin-top:24px}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}
.section-heading h2{min-width:0;overflow-wrap:anywhere;margin:0;display:flex;align-items:center;gap:12px;font-size:1.35rem}
.section-heading svg{color:var(--green)}
.count{flex-shrink:0;padding:3px 12px;border-radius:30px;background:var(--mint);font-size:.8rem;font-weight:650}
.section-description{font-size:.85rem;color:var(--muted)}
.card-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
.calc-card{display:flex;flex-direction:column;min-width:0;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);text-decoration:none;transition:border-color .15s,box-shadow .15s}
.calc-card:hover{border-color:var(--green);box-shadow:0 6px 20px #153c300d}
.card-symbol{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--mint);color:var(--green);margin-bottom:22px}
.calc-card h3{margin-bottom:12px}
.calc-card p{font-size:.875rem;line-height:1.7;color:var(--muted);margin-bottom:24px}
.card-action{margin-top:auto;font-size:.8rem;font-weight:700;color:var(--green);display:flex;justify-content:space-between;gap:10px}
.section-gap{margin-top:44px}
.page-intro{padding:28px 0 16px}
.page-intro h1{max-width:960px}
.page-intro .eyebrow{margin-bottom:12px}
.calculator{display:grid;gap:20px;align-items:start;margin-top:26px}
.calculator form{padding:28px;min-width:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.panel-heading{font-size:1.25rem;margin-bottom:26px}
.field-grid{display:grid;gap:20px;margin-bottom:28px}
.field{min-width:0}
.field label{display:block;margin-bottom:8px;font-size:.85rem;font-weight:650;line-height:1.5}
.unit{color:var(--muted);font-weight:400}
.field input,.field select{width:100%;min-width:0;min-height:48px;border:1px solid var(--control);background:var(--paper);color:var(--ink);border-radius:8px;padding:11px 12px;font-variant-numeric:tabular-nums}
.field select{font-size:.9rem;text-overflow:ellipsis}
.field input[aria-invalid=true]{border:2px solid var(--error)}
.field input:disabled,.field select:disabled{opacity:.55;cursor:not-allowed}
.form-bottom{display:flex;align-items:center;justify-content:space-between;gap:14px}
.small{font-size:.75rem;color:var(--muted)}
.form-bottom p{margin:0;max-width:310px}
.form-bottom button{cursor:pointer;background:var(--surface);color:var(--ink);font-size:.8rem;border:1px solid var(--control);border-radius:8px;padding:10px 14px;min-height:44px}
.form-bottom button:hover{background:var(--mint)}
.results{min-width:0;padding:30px;border-radius:var(--radius);background:var(--deep);color:#fff}
.results .eyebrow{color:var(--on-deep)}
.results dl{margin:0}
.metric{padding:16px 0;border-top:1px solid #648575}
.metric dt{font-size:.85rem;color:var(--on-deep)}
.metric dd{margin:5px 0 0;font-size:1.55rem;font-weight:650;line-height:1.3;letter-spacing:-.025em;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.metric.primary{border:0;padding:0 0 16px}
.metric.primary dd{color:var(--accent);font-size:clamp(2.3rem,4vw,3.4rem)}
.breakdown-heading{color:var(--on-deep);font-size:.8rem;letter-spacing:0;margin:22px 0 14px}
.breakdown .metric{display:flex;align-items:baseline;justify-content:space-between;gap:20px;padding:13px 0}
.breakdown .metric dt{font-size:.8rem}
.breakdown .metric dd{font-size:1.05rem;margin:0;text-align:right}
.result-note{font-size:.75rem;line-height:1.7;color:var(--on-deep);margin:20px 0 0}
.notice{background:var(--notice);color:var(--notice-ink);border:1px solid var(--line);border-radius:12px;padding:18px 20px;font-size:.85rem;margin:24px 0}
.notice a{font-weight:650}
.formula{font: .85rem/1.8 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--mint);border-radius:12px;padding:20px}
.explain-grid{display:grid;gap:32px;margin:48px 0}
.explain-grid .faq{margin:0}
.comparison,.faq,.rate-section{margin-top:40px}
.faq details{border-bottom:1px solid var(--line);padding:16px 0}
.faq summary{cursor:pointer;font-size:.95rem;font-weight:650;padding:4px 8px 4px 0}
.faq details p{font-size:.9rem;margin:16px 0 0;color:var(--muted)}
.article{max-width:900px;margin:36px auto}
.article h2{font-size:1.5rem;margin:32px 0 18px}
.article p{color:var(--muted)}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin:24px 0;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.85rem;min-width:600px}
caption{text-align:left;padding:16px;background:var(--mint);font-weight:650}
th,td{padding:16px;text-align:left;vertical-align:top;border-top:1px solid var(--line)}
thead th{background:var(--mint)}
tbody th{font-weight:650}
td{color:var(--muted);font-variant-numeric:tabular-nums}
.rate-section table{min-width:0}
.rate-section td,.rate-section th{width:50%;overflow-wrap:anywhere}
.comparison td:last-child{min-width:210px}
.comparison td:not(:last-child){white-space:nowrap}
.ad-slot{min-height:120px;margin-top:48px;display:grid;place-items:center;border:1px dashed var(--control);border-radius:12px;background:var(--mint);color:var(--muted);font-size:.7rem;text-align:center;padding:16px}
.site-footer{border-top:1px solid var(--line);margin-top:56px;padding:36px 0}
.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:28px}
.site-footer p{font-size:.8rem;color:var(--muted);max-width:560px}
.site-footer p:first-child{font-size:1.15rem;font-weight:750;color:var(--ink);margin-bottom:12px}
[hidden]{display:none!important}
html:lang(ja) h1,html:lang(ja) h2,html:lang(ja) h3{letter-spacing:normal;line-height:1.45}

@media(min-width:560px){.field-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media(min-width:900px){.hero{grid-template-columns:1.25fr 1fr;gap:72px;padding:52px 0 64px}
.hero-example{padding:32px}
.card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.calculator{grid-template-columns:1.45fr 1fr;gap:24px}
.explain-grid{grid-template-columns:1fr 1fr;gap:48px}
.ad-slot{min-height:120px}
}

@media(max-width:559px){.container{width:calc(100% - 32px)}
.header-inner{gap:8px}
.site-header nav{gap:8px 18px}
.brand svg{width:174px}
.site-header nav a{font-size:.8rem}
.hero{padding-top:20px}
.hero-example,.results,.calculator form{padding:24px}
.form-bottom{flex-wrap:wrap}
.ad-slot{min-height:250px}
.language-switcher{gap:8px 20px}
.page-intro{padding-top:18px}
.hero h1{font-size:2.8rem}
.trust-strip{flex-direction:column}
}

@media(prefers-color-scheme:dark){:root{color-scheme:dark;--paper:#101c19;--surface:#192b25;--ink:#edf4ee;--muted:#b6c8bd;--line:#3c5146;--control:#829b8b;--green:#a8db98;--mint:#253e30;--deep:#183d30;--focus:#a6c7ff;--notice:#322e1f;--notice-ink:#eddfa9;--error:#ffb4ab}
.button{color:#10291e}
.hero-example input{color-scheme:light}
.brand svg>path{fill:#23795e}
.calc-card:hover{box-shadow:0 6px 20px #0003}
}

@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}
}

@media print{body{background:#fff;color:#000}
.site-header,.site-footer,.language-switcher,.related,.ad-slot,.form-bottom button,.skip-link{display:none}
.container{width:100%}
.calculator{display:block}
.results{background:#fff;border:1px solid #666;color:#000}
.results .eyebrow,.metric dt,.metric dd,.metric.primary dd,.result-note,.breakdown-heading{color:#000}
.metric{border-color:#999}
.faq details{break-inside:avoid}
.hero-example{box-shadow:none}
}

.consent{position:fixed;z-index:50;left:1rem;right:1rem;bottom:1rem;max-width:34rem;margin-left:auto;padding:1rem 1.1rem;border-radius:14px;background:var(--surface,#fff);color:inherit;border:1px solid rgba(127,127,127,.35);box-shadow:0 10px 30px rgba(0,0,0,.18);font-size:.92rem;line-height:1.45}
.consent p{margin:0 0 .6rem}.consent-title{font-weight:700}
.consent-actions{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.consent-actions button{flex:1 1 8rem;min-height:44px;padding:.55rem 1rem;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;border:2px solid currentColor;background:transparent;color:inherit}
.consent-actions button:focus-visible,.consent-actions a:focus-visible{outline:3px solid #2f8f5b;outline-offset:2px}
.consent-actions a{flex-basis:100%;font-size:.85rem}
@media (prefers-color-scheme:dark){.consent{background:var(--surface,#16241f);box-shadow:0 10px 30px rgba(0,0,0,.5)}}