:root{
  --bg:#f6f7f9;--surface:#fff;--surface-soft:#f1f7f7;--ink:#182024;--muted:#5d6970;--line:#dfe4e7;
  --brand:#087e8a;--brand-dark:#05616a;--pink:#d6156b;--shadow:0 18px 52px -38px rgba(18,40,46,.38);
  --radius:18px;--content:720px;--wide:1180px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Yu Gothic UI","Yu Gothic",Meiryo,sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:94px}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased}
a{color:inherit}.skip-link{position:fixed;z-index:999;left:14px;top:10px;transform:translateY(-160%);background:#111;color:#fff;padding:10px 14px;border-radius:9px;font-weight:700}.skip-link:focus{transform:none}.reading-progress{position:fixed;z-index:120;left:0;top:0;width:100%;height:3px;background:transparent}.reading-progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--brand),var(--pink))}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.9);backdrop-filter:blur(16px);border-bottom:1px solid rgba(223,228,231,.9)}.header-inner{max-width:var(--wide);height:72px;margin:auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:22px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;letter-spacing:-.035em;font-size:20px;white-space:nowrap}.brand-mark{width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),#39abb2);color:#fff;font-size:16px;box-shadow:0 8px 18px -11px rgba(8,126,138,.7)}.site-nav{display:flex;align-items:center;gap:24px}.site-nav a{text-decoration:none;color:var(--muted);font-size:14px;font-weight:700}.site-nav a:hover{color:var(--brand)}.site-nav .primary{padding:10px 16px;border-radius:999px;background:var(--ink);color:#fff}.site-nav .primary:hover{background:var(--brand);color:#fff}.mobile-cta{display:none}.breadcrumbs{max-width:var(--wide);margin:0 auto;padding:18px 24px 0;display:flex;gap:8px;align-items:center;flex-wrap:wrap;color:#718087;font-size:13px}.breadcrumbs a{text-underline-offset:3px}.breadcrumbs span[aria-hidden=true]{color:#abb5ba}.guide-hero{max-width:var(--wide);margin:20px auto 34px;padding:58px 54px;border-radius:28px;position:relative;overflow:hidden;background:linear-gradient(135deg,#e9f7f7 0%,#fff 52%,#fff0f6 100%);border:1px solid #dceaea}.guide-hero::after{content:"";position:absolute;width:330px;height:330px;right:-120px;top:-180px;border-radius:50%;border:58px solid rgba(8,126,138,.08)}.guide-kicker{display:inline-flex;align-items:center;gap:9px;font-weight:900;color:var(--brand);font-size:13px;letter-spacing:.08em}.guide-kicker::before{content:"";width:24px;height:3px;border-radius:3px;background:var(--pink)}.guide-hero h1{max-width:760px;margin:16px 0 14px;font-size:clamp(36px,6vw,64px);line-height:1.18;letter-spacing:-.055em}.guide-hero p{max-width:650px;margin:0;color:var(--muted);font-size:17px;line-height:1.85}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 18px;border-radius:999px;text-decoration:none;font-size:14px;font-weight:800;border:1px solid var(--line);background:#fff}.button.primary{background:var(--ink);border-color:var(--ink);color:#fff}.button.primary:hover{background:var(--brand);border-color:var(--brand)}.button.secondary:hover{border-color:var(--brand);color:var(--brand)}.guide-main{max-width:var(--wide);margin:0 auto;padding:0 24px 70px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:34px 0 18px}.section-heading h2{margin:0;font-size:clamp(25px,4vw,36px);letter-spacing:-.04em}.section-heading p{margin:0;color:var(--muted);font-size:14px}.featured-card{display:grid;grid-template-columns:1.15fr .85fr;min-height:330px;border:1px solid var(--line);border-radius:24px;overflow:hidden;background:var(--surface);box-shadow:var(--shadow);text-decoration:none}.featured-copy{padding:42px}.featured-copy h2{font-size:clamp(28px,4vw,42px);line-height:1.3;letter-spacing:-.045em;margin:14px 0 13px}.featured-copy p{color:var(--muted);font-size:16px;line-height:1.8;margin:0}.read-link{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-size:14px;font-weight:900;margin-top:24px}.featured-visual{position:relative;display:grid;place-items:center;background:linear-gradient(145deg,#e8f6f7,#dff1f3);overflow:hidden}.featured-visual::before,.featured-visual::after{content:"";position:absolute;border-radius:50%;border:1px solid rgba(8,126,138,.15)}.featured-visual::before{width:300px;height:300px;right:-60px;top:-90px}.featured-visual::after{width:180px;height:180px;left:-60px;bottom:-70px}.big-icon{width:132px;height:132px;border-radius:34px;display:grid;place-items:center;background:#fff;color:var(--brand);box-shadow:0 28px 58px -36px rgba(8,90,100,.6);transform:rotate(-4deg)}.big-icon svg{width:66px;height:66px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.eyebrow{display:inline-flex;padding:6px 10px;border-radius:999px;background:#edf6f6;color:var(--brand);font-size:11px;font-weight:900;letter-spacing:.08em}.meta-line{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px;color:#77838a;font-size:12px}.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.guide-card{display:grid;grid-template-columns:64px 1fr;gap:18px;min-height:190px;padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--surface);text-decoration:none;transition:transform .18s,border-color .18s,box-shadow .18s}.guide-card:hover{transform:translateY(-3px);border-color:#a8cfd2;box-shadow:var(--shadow)}.card-icon{width:60px;height:60px;border-radius:17px;display:grid;place-items:center;background:#eef7f7;color:var(--brand)}.card-icon.coral{background:#fff0ec;color:#d95f42}.card-icon.blue{background:#edf3ff;color:#4169c1}.card-icon.purple{background:#f3efff;color:#7654b4}.card-icon.amber{background:#fff6df;color:#aa7620}.card-icon svg{width:31px;height:31px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.guide-card h3{margin:4px 0 8px;font-size:20px;line-height:1.45;letter-spacing:-.025em}.guide-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.75}.guide-card .meta-line{margin-top:13px}.guide-cta{margin-top:48px;padding:38px;border-radius:24px;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:30px}.guide-cta h2{margin:0 0 8px;font-size:30px;letter-spacing:-.04em}.guide-cta p{margin:0;color:#c7d0d4;line-height:1.7}.guide-cta .button{flex:none;background:#fff;color:var(--ink);border-color:#fff}.site-footer{border-top:1px solid var(--line);background:#fff}.footer-inner{max-width:var(--wide);margin:auto;padding:32px 24px 42px;display:flex;justify-content:space-between;gap:24px;color:#77838a;font-size:13px}.footer-links{display:flex;gap:16px;flex-wrap:wrap}.footer-links a{text-underline-offset:3px}
/* Article */
.article-hero{max-width:var(--wide);margin:14px auto 28px;padding:48px 24px 30px}.article-hero-inner{max-width:900px}.article-hero .tag{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-size:12px;font-weight:900;letter-spacing:.09em}.article-hero .tag::before{content:"";width:23px;height:3px;background:var(--pink);border-radius:5px}.article-hero h1{margin:15px 0 16px;font-size:clamp(34px,5.5vw,58px);line-height:1.25;letter-spacing:-.055em}.article-lead{max-width:780px;margin:0;color:var(--muted);font-size:18px;line-height:1.9}.article-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:21px;color:#76838a;font-size:13px}.article-layout{max-width:var(--wide);margin:0 auto;padding:0 24px 80px;display:grid;grid-template-columns:220px minmax(0,var(--content));gap:48px;align-items:start}.toc{position:sticky;top:96px;padding:20px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.78)}.toc-title{font-size:12px;font-weight:900;color:#77838a;letter-spacing:.08em;margin-bottom:12px}.toc ol{list-style:none;margin:0;padding:0}.toc li+li{margin-top:3px}.toc a{display:block;padding:7px 9px;border-radius:8px;text-decoration:none;color:#637078;font-size:13px;line-height:1.5}.toc a:hover,.toc a.active{background:#eaf5f5;color:var(--brand);font-weight:800}.article-body{min-width:0}.summary-box{padding:24px 26px;border:1px solid #bfdedf;border-radius:18px;background:linear-gradient(135deg,#edf8f8,#fff);margin-bottom:34px}.summary-box h2{margin:0 0 13px;font-size:18px;letter-spacing:-.02em}.summary-box ul{margin:0;padding:0;list-style:none}.summary-box li{position:relative;padding-left:30px;font-size:15px;line-height:1.75}.summary-box li+li{margin-top:7px}.summary-box li::before{content:"✓";position:absolute;left:0;top:1px;width:20px;height:20px;border-radius:50%;display:grid;place-items:center;background:var(--brand);color:#fff;font-size:12px;font-weight:900}.article-section{padding:4px 0 38px;border-bottom:1px solid var(--line);margin-bottom:38px}.article-section:last-of-type{border-bottom:0}.article-section h2{position:relative;margin:0 0 22px;padding-top:4px;font-size:28px;line-height:1.5;letter-spacing:-.035em}.article-section h2::before{content:"";display:block;width:36px;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--brand),var(--pink));margin-bottom:13px}.article-section h3{font-size:20px;margin:30px 0 10px;letter-spacing:-.02em}.article-section p,.article-section li{font-size:17px;line-height:1.95;color:#38454b}.article-section p{margin:0}.article-section p+p{margin-top:18px}.article-section ul,.article-section ol{padding-left:1.35em;margin:0}.article-section li+li{margin-top:8px}.article-section strong,.article-section b{color:var(--ink)}.article-section.notice,.article-section.warn{padding:26px;border-radius:18px;border:1px solid;margin-bottom:36px}.article-section.notice{background:#eef8f8;border-color:#c7e0e2}.article-section.warn{background:#fff8e9;border-color:#ecd7a7}.article-section.notice h2::before{background:var(--brand)}.article-section.warn h2::before{background:#b67a18}.table-wrap{overflow-x:auto;margin:14px 0 18px;border:1px solid var(--line);border-radius:14px;background:#fff}.article-section table{border-collapse:collapse;width:100%;min-width:560px;font-size:15px}.article-section th,.article-section td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.7}.article-section th{background:#f3f6f7;font-size:13px;color:#5d6970}.article-section tr:last-child td{border-bottom:0}.meta{font-size:13px!important;color:#77838a!important}.article-cta{padding:31px;border-radius:20px;background:linear-gradient(135deg,var(--ink),#253a40);color:#fff;margin-top:42px}.article-cta .small{font-size:12px;font-weight:900;letter-spacing:.1em;color:#8fd0d4}.article-cta h2{font-size:28px;margin:8px 0 10px;letter-spacing:-.035em}.article-cta p{margin:0;color:#cbd5d9;font-size:15px;line-height:1.8}.article-cta .button{margin-top:20px;background:#fff;color:var(--ink);border-color:#fff}.related{max-width:var(--wide);margin:0 auto;padding:0 24px 78px}.related h2{font-size:28px;letter-spacing:-.04em;margin:0 0 18px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.related-card{padding:22px;border-radius:17px;border:1px solid var(--line);background:#fff;text-decoration:none}.related-card:hover{border-color:#9cc9cc}.related-card .label{font-size:11px;font-weight:900;color:var(--brand);letter-spacing:.07em}.related-card h3{font-size:17px;line-height:1.5;margin:8px 0 0}.back-top{display:inline-flex;margin-top:22px;font-size:13px;color:var(--brand);font-weight:800;text-underline-offset:3px}
@media(max-width:900px){.article-layout{grid-template-columns:1fr;gap:0}.toc{position:relative;top:auto;margin-bottom:28px}.toc ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}.featured-card{grid-template-columns:1fr}.featured-visual{min-height:250px}.related-grid{grid-template-columns:1fr 1fr}}
@media(max-width:720px){html{scroll-padding-top:72px}.site-header{position:sticky}.header-inner{height:62px;padding:0 16px}.brand{font-size:16px}.brand-mark{width:29px;height:29px}.site-nav a:not(.primary){display:none}.site-nav .primary{padding:9px 13px;font-size:12px}.guide-hero{margin:12px 12px 26px;padding:38px 24px;border-radius:22px}.guide-hero h1{font-size:36px}.guide-hero p{font-size:15px}.guide-main{padding:0 14px 54px}.featured-copy{padding:28px 24px}.featured-copy h2{font-size:29px}.guide-grid{grid-template-columns:1fr}.guide-card{grid-template-columns:54px 1fr;padding:21px 18px;min-height:0}.card-icon{width:52px;height:52px}.guide-cta{display:block;padding:28px 23px}.guide-cta h2{font-size:25px}.guide-cta .button{margin-top:18px;width:100%}.footer-inner{display:block;padding:26px 18px 100px}.footer-links{margin-top:16px}.article-hero{padding:32px 18px 20px}.article-hero h1{font-size:34px}.article-lead{font-size:16px}.article-layout{padding:0 16px 60px}.toc{padding:16px}.toc ol{grid-template-columns:1fr}.summary-box{padding:21px 19px}.article-section{margin-bottom:32px;padding-bottom:32px}.article-section h2{font-size:24px}.article-section h3{font-size:19px}.article-section p,.article-section li{font-size:16px;line-height:1.9}.article-section.notice,.article-section.warn{padding:21px 18px}.article-cta{padding:27px 21px}.related{padding:0 16px 100px}.related-grid{grid-template-columns:1fr}.mobile-cta{position:fixed;z-index:90;left:12px;right:12px;bottom:max(12px,env(safe-area-inset-bottom));display:flex;justify-content:center;padding:13px 16px;border-radius:999px;background:var(--ink);color:#fff;text-decoration:none;font-size:14px;font-weight:900;box-shadow:0 12px 34px -16px rgba(0,0,0,.7)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.guide-card{transition:none}}