:root{
  --ink:#222;
  --text:#333;
  --muted:#666;
  --green:#2c4f68;
  --soft:#f7f7f7;
  --cream:#ffffff;
  --line:#d9d9d9;
  --orange:#8b4c2f;
  --white:#fff;
  --radius:8px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Kaku Gothic ProN","Yu Gothic","Noto Sans JP",sans-serif;font-size:15px;line-height:1.8}
a{color:#1f4ea3;text-decoration:none}
a:hover{text-decoration:underline}
button,input,select,textarea{font:inherit}
button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}
button{cursor:pointer}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid #1f4ea3;outline-offset:2px}
button:disabled{cursor:not-allowed;opacity:.5}
[hidden]{display:none!important}
.container{width:min(1120px,calc(100% - 32px));margin:auto}
.site-header{background:#fff;border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{width:36px;height:36px;border:1px solid #7f8b95;border-radius:4px;background:#fff;display:grid;place-items:center;color:#2c4f68;font-size:22px;font-weight:700;line-height:1}
.brand-name{font-size:28px;letter-spacing:.02em;font-weight:700}
.brand-sub{display:none}
.main-nav{display:flex;gap:24px;font-size:14px;font-weight:600}
.main-nav a{color:var(--ink)}
.eyebrow{font-size:12px;letter-spacing:.08em;color:var(--muted);font-weight:700;text-transform:none}
.hero{display:grid;grid-template-columns:1.1fr .9fr;align-items:start;gap:36px;padding:40px 0 28px}
.hero h1{color:var(--ink);font-size:clamp(30px,4vw,44px);line-height:1.5;letter-spacing:0;margin:10px 0 16px}
.accent{color:var(--ink);white-space:nowrap}
.hero-lead{font-size:15px;color:var(--muted);line-height:1.9}
.trust-row{display:flex;gap:18px;flex-wrap:wrap;margin-top:18px;font-size:13px;font-weight:600}
.trust-row span:before{content:'・';margin-right:6px;color:var(--muted)}
.hero-art{position:static;padding:0}
.hero-art:before{display:none}
.example-card{position:relative;background:#fff;border:1px solid var(--line);box-shadow:none;border-radius:var(--radius);padding:24px;transform:none}
.example-label{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted)}
.example-label b{font-size:11px;background:#f3f3f3;border:1px solid var(--line);border-radius:999px;padding:3px 10px;color:var(--ink)}
.example-equation{font-size:22px;font-weight:700;color:var(--ink);margin:22px 0 16px}
.example-answer{border-top:1px solid var(--line);padding-top:16px;display:flex;justify-content:space-between;align-items:flex-end;color:var(--ink)}
.example-answer strong{font-size:42px;letter-spacing:-.02em;line-height:1.2}
.example-answer small{font-size:18px;font-weight:700;margin-left:3px}
.example-card .text-link{display:block;margin-top:18px;font-size:13px}
.popular{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:0 0 28px;font-size:12px}
.popular>span{margin-right:8px;color:var(--muted)}
.pill{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;color:var(--ink)}
.pill:hover{border-color:#9fa8b0;text-decoration:none}
.directory{border-top:1px solid var(--line);padding:32px 0 48px;scroll-margin-top:20px;background:#fff}
.directory-top{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}
.section-title{font-size:28px;color:var(--ink);line-height:1.4;margin:6px 0}
.section-note{font-size:14px;color:var(--muted);margin:0}
.search-box{width:min(420px,100%)}
.search-box label{display:block;font-size:12px;font-weight:700;margin-bottom:6px;color:var(--ink)}
.search-row{display:flex;align-items:center;border:1px solid var(--line);background:#fff;border-radius:4px;padding-left:12px;gap:8px}
.search-row svg{width:18px;height:18px;flex:none;color:var(--muted)}
.search-row input{width:100%;padding:10px 10px 10px 0;outline:none;border:0;background:none;min-width:0}
.search-row:focus-within{outline:2px solid #1f4ea3;outline-offset:1px}
.directory-layout{display:grid;grid-template-columns:200px 1fr;gap:24px}
.category-nav{position:sticky;top:18px;align-self:start;display:grid;gap:4px}
.category-nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid transparent;border-radius:4px;color:var(--text);font-size:14px;font-weight:600}
.category-nav a:hover{background:#f7f7f7;text-decoration:none;border-color:#ececec}
.category-nav a.active{background:#fff;border-color:#8fa1ae;color:var(--ink)}
.category-nav .count{margin-left:auto;font-size:11px;opacity:.85}
.category-nav .nav-icon{width:23px;text-align:center;font-size:17px;font-weight:700}
.results-bar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:0 0 14px;font-size:13px}
.results-bar strong{color:var(--ink)}
.clear-button{border:0;background:none;color:#1f4ea3;font-size:12px;text-decoration:underline;padding:7px}
.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.tool-card{display:flex;flex-direction:column;gap:0;background:#fff;border:1px solid var(--line);border-radius:6px;padding:18px;color:var(--text);min-height:190px;transition:border-color .16s,box-shadow .16s}
.tool-card:hover{border-color:#9fa8b0;box-shadow:none;text-decoration:none}
.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.tool-icon{width:34px;height:34px;background:#f6f6f6;border:1px solid #d9d9d9;border-radius:4px;color:#2c4f68;font-size:18px;font-weight:700;display:grid;place-items:center}
.arrow{font-size:18px;color:#8c8c8c}
.tool-card h3{font-size:16px;color:var(--ink);line-height:1.6;margin:0 0 6px;letter-spacing:0}
.tool-card p{font-size:13px;line-height:1.7;color:var(--muted);margin:0}
.tool-card .category-label{font-size:11px;margin-top:auto;padding-top:12px;color:#6e6e6e}
.empty-state{border:1px dashed #bfbfbf;border-radius:6px;padding:40px 24px;text-align:center;background:#fff}
.empty-state h3{color:var(--ink)}
.principles{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);padding:28px 0;gap:24px}
.principles h3{font-size:15px;color:var(--ink);margin:0 0 6px}.principles p{font-size:13px;color:var(--muted);margin:0}
.category-index{background:#fff;padding:32px 0;border-top:1px solid var(--line)}
.category-link-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:18px}
.category-link-grid a{border:1px solid var(--line);background:#fff;display:flex;justify-content:space-between;padding:12px 14px;font-size:14px;font-weight:600;border-radius:4px;color:var(--ink)}
.category-link-grid a:hover{text-decoration:none;background:#fafafa}
.site-footer{background:#fff;padding:32px 0 22px;border-top:1px solid var(--line)}
.footer-top{display:flex;justify-content:space-between;gap:28px}.footer-top p{font-size:13px;color:var(--muted)}
.footer-links{display:flex;flex-wrap:wrap;align-content:flex-start;gap:12px 20px;font-size:13px;max-width:520px;padding-top:8px}
.copyright{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;margin:20px 0 0}
.breadcrumb{display:flex;gap:9px;flex-wrap:wrap;font-size:12px;color:var(--muted);padding:18px 0 10px}.breadcrumb a{color:var(--muted)}
.page-heading{padding:12px 0 20px;max-width:900px}.page-heading h1{font-size:clamp(28px,3vw,38px);color:var(--ink);line-height:1.5;margin:7px 0 12px}.page-heading p{font-size:14px;line-height:1.9;color:var(--muted);margin:0}
.tag{font-size:11px;color:#555;border-radius:3px;background:#f3f3f3;display:inline-block;padding:3px 8px;border:1px solid var(--line)}
.calc-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:24px;align-items:start;padding-bottom:44px}
.calculator-panel,.article-panel,.side-panel{background:#fff;border:1px solid var(--line);border-radius:6px}
.calculator-panel{padding:24px}.panel-title{font-size:20px;color:var(--ink);margin:0 0 20px}
.form-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 16px}
.field label{font-size:13px;font-weight:700;color:var(--ink);display:block;margin-bottom:6px}.field:has(textarea){grid-column:1/-1}
.input-wrap{display:flex;align-items:center;border:1px solid #cfcfcf;border-radius:4px;background:#fff;overflow:hidden}
.input-wrap:focus-within{outline:2px solid #1f4ea3;outline-offset:1px}
.input-wrap input{border:0;min-width:0;width:100%;padding:11px 10px;background:none;color:var(--ink);outline:none;font-size:16px}.input-wrap .unit{padding:0 10px 0 3px;font-size:12px;color:var(--muted);white-space:nowrap}
.field select,.field textarea{display:block;width:100%;border:1px solid #cfcfcf;border-radius:4px;padding:11px 10px;background:white;color:var(--ink);min-height:48px}.field textarea{min-height:155px;resize:vertical}
.field .hint{font-size:11px;color:var(--muted);line-height:1.7;margin:5px 0 0}
.form-actions{display:flex;gap:10px;margin:20px 0}.primary-button{border:1px solid #35536a;background:#35536a;color:white;padding:10px 22px;border-radius:4px;font-weight:700;font-size:14px}.secondary-button{border:1px solid var(--line);background:white;color:#35536a;padding:9px 16px;border-radius:4px;font-size:12px}
.result-box{background:#fafafa;border:1px solid var(--line);padding:20px;border-radius:4px;min-height:150px}.result-label{font-size:12px;color:#555;font-weight:700}.result-value{display:block;font-size:clamp(26px,3vw,38px);line-height:1.4;letter-spacing:-.02em;color:#222;font-weight:700;margin:5px 0;overflow-wrap:anywhere}.result-detail{font-size:12px;color:#666;line-height:1.8;margin:8px 0 0}.result-extras{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;border-top:1px solid #e1e1e1;margin-top:16px;padding-top:14px}.result-extras dt{font-size:11px;color:#666}.result-extras dd{font-size:16px;font-weight:700;color:#222;margin:2px 0 0;overflow-wrap:anywhere}
.result-footer{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:12px;color:var(--muted)}
.privacy-note,.noscript,.updated{font-size:12px;color:var(--muted)}.privacy-note{margin-top:14px}
.page-jump{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.page-jump a{font-size:12px;border:1px solid var(--line);padding:6px 10px;border-radius:999px;background:#fff}
.article-panel{padding:26px}.article-panel h2{font-size:20px;color:var(--ink);margin:0 0 12px;padding-top:8px;border-top:1px solid #efefef}.article-panel h2:first-child{border-top:0;padding-top:0}.article-panel p,.article-panel li,.article-panel details{font-size:14px;color:var(--text)}.article-panel .formula{font-weight:700;background:#f7f7f7;border:1px solid var(--line);border-radius:4px;padding:12px 14px}.article-panel ul{padding-left:18px}.article-panel details{border:1px solid var(--line);border-radius:4px;padding:10px 12px;background:#fff;margin-bottom:10px}.article-panel summary{cursor:pointer;font-weight:700}
.calc-sidebar{display:grid;gap:16px}.side-panel{padding:18px}.side-panel h2{font-size:15px;color:var(--ink);margin:0 0 12px}.side-links{display:grid;gap:10px}.side-links a{font-size:13px}
.prose{padding-bottom:48px}.prose .article-panel{max-width:860px}.skip-link{position:absolute;left:-9999px;top:0}.skip-link:focus{left:8px;top:8px;background:#fff;border:1px solid var(--line);padding:8px 10px;border-radius:4px;z-index:1000}
.error-message{margin:14px 0 0;color:#a22;font-size:13px;font-weight:700}.table-wrap{overflow:auto}.table-wrap table{width:100%;border-collapse:collapse;font-size:14px}.table-wrap caption{text-align:left;font-weight:700;margin-bottom:10px}.table-wrap th,.table-wrap td{border:1px solid var(--line);padding:10px 12px;text-align:left}.table-wrap thead th{background:#f7f7f7}
.home-mortgage{padding:24px 0 18px}.home-mortgage-title{font-size:32px;line-height:1.4;margin:0 0 16px;color:var(--ink)}.home-mortgage .calculator-panel{max-width:760px}.home-mortgage-more{margin:14px 0 0;font-size:13px}
@media (max-width:960px){.hero,.directory-layout,.calc-layout,.footer-top{grid-template-columns:1fr;display:grid}.main-nav{gap:18px;flex-wrap:wrap}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.category-link-grid{grid-template-columns:repeat(2,1fr)}.category-nav{position:static}.footer-top{gap:20px}.calc-layout{gap:18px}}
@media (max-width:640px){.container{width:min(100% - 24px,1120px)}.header-row{min-height:64px;align-items:flex-start;padding:14px 0;flex-direction:column}.brand-name{font-size:24px}.main-nav{font-size:13px;gap:14px}.tool-grid{grid-template-columns:1fr}.form-fields{grid-template-columns:1fr}.directory-top,.results-bar{display:block}.search-box{margin-top:12px;width:100%}.category-link-grid{grid-template-columns:1fr}.home-mortgage-title,.page-heading h1,.section-title{font-size:28px}.example-answer strong{font-size:34px}.article-panel,.calculator-panel{padding:20px}}