:root{font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP","Hiragino Kaku Gothic ProN",sans-serif;color:#152d4d;background:#fff;line-height:1.85;font-size:16px;scroll-behavior:smooth}*{box-sizing:border-box}body{margin:0}a{color:#174f9e;text-underline-offset:.25em}a:focus-visible{outline:3px solid #086dff;outline-offset:5px}header{max-width:1120px;margin:auto;padding:24px 32px;display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid #d9e0eb}.brand{font-weight:800;text-decoration:none;color:#152d4d}header span{font-size:.875rem;color:#52647d}main{max-width:1060px;margin:auto;padding:0 32px}.intro{padding:54px 0 30px}.eyebrow{font-size:.875rem;font-weight:700;letter-spacing:.1em;margin:0 0 14px;color:#446282}h1{font-size:clamp(2.4rem,6vw,4.6rem);line-height:1.25;letter-spacing:-.04em;margin:0 0 24px;font-weight:850}.lead{max-width:640px;font-size:1.125rem;margin-bottom:32px}strong{font-weight:750}.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.choices a{display:grid;grid-template-columns:36px 1fr;align-items:center;text-decoration:none;color:#fff;background:#1b355b;padding:20px 24px;border-radius:4px;transition:background .15s}.choices a:hover{background:#274974}.choices span{grid-row:span 2;color:#b8f56b;font-size:.875rem}.choices b{font-size:1.05rem}.choices small{font-size:.875rem;color:#d1deef}.note{padding:20px 24px;border-left:4px solid #b8f56b;background:#f2f6fc;color:#344c6b;font-size:.9375rem}.answer{display:grid;grid-template-columns:64px 1fr;gap:22px;padding:56px 0;border-bottom:1px solid #d9e0eb;scroll-margin-top:20px}.number{font-size:1.1rem;font-weight:800;color:#546984;border-top:3px solid #1b355b;padding-top:12px}.answer h2,.cost h2{font-size:clamp(1.55rem,3vw,2.05rem);line-height:1.5;margin:0 0 24px;letter-spacing:-.02em}.answer p,.answer ul{max-width:780px}.answer li{margin:10px 0}.caution{background:#f2f6fc;padding:18px 22px;border-radius:3px}.source{display:inline-block;font-weight:650;margin:10px 22px 4px 0;overflow-wrap:anywhere}.small{font-size:.875rem;color:#53657c}.cost{margin:54px 0;padding:32px;background:#1b355b;color:#fff;border-top:5px solid #b8f56b}.cost .eyebrow{color:#c7e99e}.cost dl{display:grid;grid-template-columns:1fr 1fr;gap:24px 32px}.cost dt{font-weight:750;color:#b8f56b}.cost dd{margin:6px 0;font-size:.9375rem}.cost p:last-child{font-size:.9375rem;color:#dbe6f4}footer{padding:0 0 44px;max-width:850px;font-size:.9375rem}.skip{position:absolute;top:-100px;background:white;padding:12px;z-index:3}.skip:focus{top:0}@media(max-width:620px){header{padding:18px 20px}header span{display:none}main{padding:0 20px}.intro{padding-top:34px}.choices{grid-template-columns:1fr}.choices a{padding:16px}.answer{grid-template-columns:32px 1fr;gap:12px;padding:36px 0}.number{font-size:.875rem}.answer ul{padding-left:20px}.cost{padding:24px 20px}.cost dl{grid-template-columns:1fr;gap:18px}.note{padding:16px}h1{font-size:2.7rem}}@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}.choices a{transition:none}}
.article-intro{max-width:820px;padding:54px 0 28px}.article-intro h1{font-size:clamp(2.15rem,5vw,3.75rem)}.article-intro .lead{max-width:760px}.article-section{max-width:820px;padding:38px 0;border-bottom:1px solid #d9e0eb}.article-section h2{font-size:clamp(1.45rem,3vw,1.95rem);line-height:1.5;margin:0 0 18px}.check-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;padding:0;list-style:none}.check-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}.check-grid li{background:#f2f6fc;border-top:4px solid #1b355b;padding:18px}.check-grid b{display:block;margin-bottom:6px}.example{padding:22px 24px;background:#f2f6fc;border-left:4px solid #b8f56b}.article-nav{display:flex;gap:18px;flex-wrap:wrap;margin:22px 0}.article-nav a{font-weight:700}@media(max-width:620px){.article-intro{padding-top:34px}.article-intro h1{font-size:2.35rem}.check-grid,.check-grid.four{grid-template-columns:1fr}.article-section{padding:30px 0}}
.calculator{padding:42px 0;border-bottom:1px solid #d9e0eb;scroll-margin-top:20px}.calculator h2{font-size:clamp(1.55rem,3vw,2.05rem);line-height:1.5}.plans{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:24px 0}.plans fieldset{min-width:0;border:1px solid #bbc9dc;border-radius:4px;padding:20px}.plans legend{font-weight:750;padding:0 8px}.plans label{display:block;margin:12px 0 6px}.calculator input,.calculator select,.calculator button{font:inherit;min-height:44px;border-radius:4px;padding:8px 12px}.calculator input{width:100%;border:1px solid #70849f;background:white;color:#152d4d}.calculator select{border:1px solid #70849f;background:white;color:#152d4d}.calculator button{border:1px solid #1b355b;background:#1b355b;color:white;cursor:pointer;margin:0 8px 12px 0}.calculator button.secondary{background:white;color:#1b355b}.calculator :is(input,select,button):focus-visible{outline:3px solid #086dff;outline-offset:3px}.calculator output{display:block;padding:20px;background:#f2f6fc;border-left:4px solid #b8f56b;font-weight:700;overflow-wrap:anywhere}@media(max-width:620px){.plans{grid-template-columns:1fr;gap:14px}.plans fieldset{padding:16px}}
.check-list{list-style:none;counter-reset:check;padding:0;margin:24px 0}.check-list li{counter-increment:check;display:grid;grid-template-columns:46px 1fr;gap:2px 14px;padding:18px 0;border-top:1px solid #d9e0eb}.check-list li::before{content:counter(check,decimal-leading-zero);grid-row:span 2;font-weight:800;color:#174f9e}.check-list b{font-size:1.05rem}.check-list span{color:#435a76}.compare-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.compare-cards>div{background:#f2f6fc;border-top:4px solid #1b355b;padding:18px}.compare-cards h3{margin:0 0 8px;font-size:1.05rem}.compare-cards p{margin:0}@media(max-width:620px){.compare-cards{grid-template-columns:1fr}}
.related-guides{margin:48px 0 40px;padding:24px;border:1px solid #d9e0eb;border-radius:6px;background:#f8fafc;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 18px}.related-guides h2{grid-column:1/-1;margin:0 0 4px;font-size:1.15rem}.related-guides a{font-weight:700}@media(max-width:620px){.related-guides{grid-template-columns:1fr}.related-guides h2{grid-column:auto}}
.faq-list{display:grid;gap:10px}.faq-list details{border:1px solid #d9e0eb;border-radius:4px;background:#f8fafc;padding:0 18px}.faq-list summary{cursor:pointer;font-weight:750;padding:16px 28px 16px 0}.faq-list details[open] summary{border-bottom:1px solid #d9e0eb}.faq-list details p{margin:14px 0 18px}.faq-list summary:focus-visible{outline:3px solid #086dff;outline-offset:3px}