:root{--brand:#183c52;--text:#303e47;--muted:#52616a;--link:#1a6088;--line:#dce4e7;--soft:#f2f6f7;--amber:#faf6ec;--max:1160px}
*{box-sizing:border-box}html{scroll-behavior:auto;scroll-padding-top:20px}body{margin:0;color:var(--text);background:#fff;font-family:"Yu Gothic", "Hiragino Kaku Gothic ProN",Meiryo,sans-serif;font-size:16px;font-weight:500;line-height:1.85;overflow-wrap:anywhere}a{color:var(--link);text-underline-offset:5px}a:hover{text-decoration:underline}button{font:inherit}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--brand);line-height:1.55}h2{font-size:1.65rem;letter-spacing:.025em}h3{font-size:1.12rem}p{margin-bottom:1.2em}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #2581ae;outline-offset:5px}[hidden]{display:none!important}.container{max-width:var(--max);margin-inline:auto;padding-inline:24px}.small,.byline,.ad-note{font-size:.875rem}.eyebrow{font-size:.75rem;letter-spacing:.16em;font-weight:700;color:#527582;margin-bottom:16px}.site-header{border-bottom:1px solid var(--line);background:#fff}.header-inner{max-width:1400px;margin:auto;padding:22px 26px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--brand);font-weight:700;letter-spacing:.03em;text-decoration:none;font-size:1.15rem}.brand-mark{background:var(--brand);color:white;border-radius:4px;width:32px;height:34px;display:grid;place-items:center;font-size:1rem}.site-nav{display:flex;flex-wrap:wrap;gap:24px;font-size:.875rem;font-weight:700}.site-nav a{color:var(--brand);text-decoration:none}.site-nav a:hover{color:var(--link);text-decoration:underline}.menu-toggle{background:white;border:1px solid var(--line);padding:6px 10px;border-radius:3px;font-size:.875rem;color:var(--brand)}.skip-link{position:absolute;left:16px;top:-100px;background:white;padding:12px;z-index:10}.skip-link:focus{top:10px}.hero{background:linear-gradient(110deg,#f3f7f7,#fbfcfc);border-bottom:1px solid var(--line);padding:64px 0}.hero-grid{display:grid;gap:40px}.hero h1{font-size:clamp(2rem,4vw,3.15rem);letter-spacing:.04em;margin-bottom:16px}.hero-title{font-weight:700;color:var(--brand);font-size:1.3rem;line-height:1.85}.hero p:not(.eyebrow):not(.hero-title){font-size:1rem}.button{background:var(--brand);color:#fff;display:inline-flex;justify-content:space-between;align-items:center;gap:36px;padding:14px 24px;border-radius:4px;text-decoration:none;font-weight:700;margin-top:10px}.button:hover{background:#24516b}.hero-note{background:#fff;border:1px solid #d7e1e4;border-radius:6px;padding:30px 32px;position:relative;align-self:center}.note-number{color:#64818c;font-size:.75rem;letter-spacing:.12em}.hero-note h2{font-size:1.6rem;margin:20px 0 14px}.hero-note a{font-size:1rem;font-weight:700}.data-symbol{display:flex;gap:5px;margin-top:28px;align-items:flex-end;height:32px}.data-symbol span{display:block;width:24px;height:32px;border:1.5px solid #64818c;border-radius:3px;background:linear-gradient(0deg,#e3edf0 25%,transparent 25%)}.data-symbol span:nth-child(2){height:25px}.data-symbol span:nth-child(3){height:19px}.section{padding-block:68px}.section-heading{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px;margin-bottom:28px}.section-heading h2{margin-bottom:0}.section-heading>p{font-size:1rem;color:var(--muted);margin:0}.symptom-grid{display:grid;gap:12px}.symptom-card{border:1px solid var(--line);border-radius:4px;display:flex;flex-direction:column;padding:20px;text-decoration:none;transition:background .15s}.symptom-card:hover,.symptom-card:focus-visible{background:var(--soft);border-color:#90acb9;text-decoration:none}.card-number{font-family:Georgia,serif;color:#648694;font-size:1.25rem}.symptom-card h3{margin:18px 0 22px;font-size:1rem}.card-bottom{margin-top:auto;display:flex;justify-content:space-between;font-size:.9375rem}.device-links{border-top:1px solid var(--line);margin-top:26px;padding-top:20px;display:flex;flex-wrap:wrap;gap:14px 28px;font-size:1rem}.device-links>span{color:var(--muted)}.device-links a{text-decoration:none;font-weight:700}.principle{background:var(--brand);color:#dce6eb}.principle-grid{display:grid;gap:24px}.principle h2{color:white;font-size:1.85rem}.principle .eyebrow{color:#a9c7d2}.principle .lead{color:white;font-size:1.2rem}.principle a{color:#fff;font-weight:700;text-decoration-thickness:2px;text-underline-offset:6px}.principle a:hover,.principle a:focus-visible{background:rgba(255,255,255,.08)}.guide-list>a{display:grid;grid-template-columns:30px 1fr 20px;gap:20px;padding:25px 0;border-top:1px solid var(--line);text-decoration:none}.guide-list>a:last-child{border-bottom:1px solid var(--line)}.guide-list h3{margin-bottom:8px}.guide-list p{font-size:1rem;color:var(--muted);margin-bottom:0}.guide-list>a:hover h3{text-decoration:underline;text-underline-offset:5px}.guide-section{background:var(--soft)}.three-grid{display:grid;gap:20px;margin-top:28px}.guide-card{padding:28px;background:white;border:1px solid var(--line);border-radius:4px;text-decoration:none;display:flex;flex-direction:column}.guide-card h3{font-size:1.25rem;margin:18px 0}.guide-card p{color:var(--muted);font-size:1rem}.guide-card>span:last-child{margin-top:auto;font-size:1rem;font-weight:700}.guide-card:hover{border-color:#7296a9;text-decoration:none}.tag{font-size:.75rem;letter-spacing:.05em;color:#716040;font-weight:700}.policy-panel{padding:30px;background:var(--amber);border-left:3px solid #bca97d;display:grid;gap:20px}.policy-panel p{font-size:1rem}.policy-panel a{align-self:center;white-space:nowrap;font-weight:700;font-size:1rem}.operator{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;margin-top:42px}.operator h2{font-size:1.15rem}.operator p{font-size:1rem;margin:0}.operator>a{font-size:1rem}.site-footer{background:#f3f6f7;border-top:1px solid var(--line);padding:42px 0 20px}.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px}.footer-inner p{font-size:1rem;margin-top:14px;color:var(--muted)}.footer-inner nav{display:grid;gap:8px;align-content:start;font-size:.875rem}.footer-inner nav a{text-decoration:none}.copyright{border-top:1px solid var(--line);margin-top:24px;padding-top:20px;color:var(--muted);font-size:.75rem}.article{max-width:900px;padding-bottom:68px}.breadcrumbs{font-size:.875rem;color:var(--muted);padding-block:22px}.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0}.breadcrumbs li+li:before{content:' / ';margin-right:8px}.article-header{padding:26px 0 20px}.article-header h1{font-size:clamp(1.8rem,3vw,2.5rem);margin-bottom:24px}.lead{font-size:1.1rem}.byline{color:var(--muted);margin-top:24px}.toc{background:var(--soft);padding:24px 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#90acb9;border-radius:3px;display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:1rem;font-weight:700;text-decoration:none}.cta-links a:hover,.cta-links a:focus-visible{border-color:var(--link);background:#f6f9fa}.cta-links a>span{flex-shrink:0;font-size:1.2em;color:var(--link)}.affiliate-cta{border:1px solid var(--line);padding:24px;margin:32px 0}.affiliate-cta>a{font-weight:700}.affiliate-cta p:last-child{margin:14px 0 0}.faq{margin-top:40px}.faq h2,.references h2{font-size:1.4rem}.faq details{border-top:1px solid var(--line);padding-block:18px}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{cursor:pointer;font-weight:700;color:var(--brand);padding-right:12px}.faq details p{margin:18px 0 0;font-size:1rem}.references{margin-top:40px;font-size:1rem}.ad-note{color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:28px}.related-link{border-left:3px solid #90acb9;padding:15px 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@media(min-width:640px){.symptom-grid{grid-template-columns:repeat(2,1fr)}.three-grid{grid-template-columns:repeat(3,1fr)}.guide-card{padding:24px}.facts{grid-template-columns:140px 1fr;gap:20px}.facts dd{margin:0}.footer-inner nav{grid-template-columns:repeat(2,auto);column-gap:32px}}
@media(min-width:900px){.hero-grid{grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:70px}.hero{padding-block:64px}.symptom-grid{grid-template-columns:repeat(5,1fr)}.principle-grid{grid-template-columns:1fr 1.2fr;gap:85px}.policy-panel{grid-template-columns:1fr auto;gap:60px}.hero-note{padding:30px 36px}}
@media(min-width:1080px){.menu-toggle{display:none}.site-nav{display:flex!important}}
@media(max-width:1079px){.site-nav{width:100%;gap:0;flex-direction:column}.site-nav a{padding:12px 0;border-top:1px solid var(--line)}.js .site-nav{display:none}.js .site-nav.is-open{display:flex}}
@media(max-width:639px){.container{padding-inline:20px}.header-inner{padding:16px 20px;gap:12px}.brand{font-size:1rem}.brand-mark{width:27px;height:29px}.menu-toggle{font-size:.75rem;padding:5px 8px}.hero{padding-block:40px}.hero-title{font-size:1.13rem}.desktop-break{display:none}.hero-note{padding:24px;width:100%}.hero-note h2 br{display:none}.hero-note h2{font-size:1.3rem}.data-symbol{display:none}.hero-note p br{display:none}.section{padding-block:44px}h2{font-size:1.4rem}.symptom-card{display:grid;grid-template-columns:26px 1fr;gap:4px 12px;padding:18px}.symptom-card h3{margin:0;align-self:center}.card-bottom{grid-column:2}.three-grid{gap:14px}.guide-card h3 br{display:none}.guide-card h3{font-size:1.15rem}.policy-panel{padding:24px}.policy-panel a{white-space:normal}.article-header{padding-top:12px}.safety-box,.cta,.toc{padding:22px}.article-body h2{font-size:1.25rem}.guide-list>a{gap:12px;grid-template-columns:25px 1fr 16px}.hero .button{font-size:.9375rem}.article-header h1{font-size:1.8rem}.footer-inner nav{grid-template-columns:repeat(2,auto);gap:12px 22px}}

@media(min-width:900px){.article-body{font-size:1.0625rem}.guide-card p,.guide-list p{font-size:1.0625rem}}