
:root{--navy:#0b1f3a;--navy2:#133764;--blue:#2563eb;--blue2:#0ea5e9;--ink:#122033;--muted:#5b6678;--line:#dde5ef;--soft:#f6f8fc;--softblue:#eef5ff;--green:#0b8f63;--amber:#b7791f;--white:#fff;--radius:18px;--shadow:0 14px 40px rgba(11,31,58,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;line-height:1.8;background:#fff;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-underline-offset:3px}img,svg{max-width:100%;height:auto}button,input,select,textarea{font:inherit}button{cursor:pointer}.wrap{width:min(1160px,calc(100% - 40px));margin-inline:auto}.prose{width:min(800px,100%)}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);border-bottom:1px solid rgba(221,229,239,.9)}.header-row{min-height:72px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font-weight:800;letter-spacing:.01em}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--blue2));color:white;font-size:18px}.brand small{display:block;font-size:10px;line-height:1;color:#64748b;font-weight:700;margin-top:3px}.nav-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:white;border-radius:10px;padding:8px 12px;min-height:44px}.global-nav{margin-left:auto;display:flex;gap:4px;align-items:center}.global-nav a{color:#334155;text-decoration:none;font-weight:700;font-size:14px;padding:12px 10px;border-radius:10px}.global-nav a:hover,.global-nav a:focus-visible{background:var(--softblue);color:var(--blue)}.header-cta{background:var(--navy)!important;color:white!important;padding:11px 16px!important}.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#f3f8ff 0%,#fff 100%);border-bottom:1px solid var(--line)}.hero:before{content:"";position:absolute;width:460px;height:460px;border-radius:50%;right:-180px;top:-240px;background:radial-gradient(circle,rgba(37,99,235,.14),rgba(37,99,235,0) 68%)}.hero-inner{position:relative;padding:56px 0 48px}.breadcrumb{font-size:13px;color:#64748b;margin:0 0 22px;white-space:nowrap;overflow:auto}.breadcrumb a{color:#64748b}.kicker{display:inline-flex;align-items:center;gap:8px;margin:0 0 14px;padding:6px 10px;border-radius:999px;background:#e8f1ff;color:#174ea6;font-size:12px;font-weight:800;letter-spacing:.04em}.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.22;letter-spacing:-.03em;margin:0;color:var(--navy);max-width:900px}.hero .lead{max-width:760px;font-size:18px;color:#465468;margin:20px 0 0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:48px;padding:12px 18px;border-radius:12px;border:1px solid transparent;text-decoration:none;font-weight:800}.btn-primary{background:var(--blue);color:white}.btn-secondary{background:white;color:var(--navy);border-color:var(--line)}.trust-row{display:flex;gap:18px;flex-wrap:wrap;margin-top:24px;color:#4b5a6f;font-size:13px}.trust-row span:before{content:"✓";color:var(--green);font-weight:900;margin-right:5px}.decision-wrap{background:white;border-bottom:1px solid var(--line)}.decision-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;padding:18px 0}.decision-step{display:flex;align-items:center;gap:9px;text-decoration:none;color:#536174;font-size:12px;font-weight:800;padding:8px;border-radius:10px}.decision-step b{display:grid;place-items:center;flex:0 0 28px;height:28px;border-radius:50%;background:#edf1f7;color:#42526a}.decision-step.active{background:#edf5ff;color:var(--blue)}.decision-step.active b{background:var(--blue);color:white}main{padding:46px 0 72px}.section{margin:0 0 56px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:20px}.section h2{font-size:clamp(24px,3.5vw,34px);line-height:1.35;margin:0;color:var(--navy);letter-spacing:-.02em}.section h3{line-height:1.45}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--blue);font-weight:900;margin:0 0 6px}.muted{color:var(--muted)}.grid{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:white;box-shadow:0 2px 0 rgba(15,23,42,.01)}.card h3{margin:0 0 8px;color:var(--navy)}.card p{margin:0;color:#566377}.card-link{display:block;text-decoration:none;color:inherit;transition:.18s ease}.card-link:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#c8d9f7}.number{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--softblue);color:var(--blue);font-weight:900;margin-bottom:15px}.tool-card{background:linear-gradient(180deg,#fff,#f9fbff)}.tool-card .tool-icon{font-size:25px}.callout{border:1px solid #bdd4fb;background:#f2f7ff;border-radius:var(--radius);padding:22px}.callout strong{color:var(--navy)}.warning{border-color:#ead7ae;background:#fffaf0}.note{font-size:13px;color:#64748b}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px}.toc{position:sticky;top:92px;align-self:start;border:1px solid var(--line);border-radius:16px;padding:18px;background:#fbfcfe}.toc strong{display:block;margin-bottom:8px}.toc a{display:block;color:#536174;text-decoration:none;padding:6px 0;font-size:14px}.check-list{padding:0;list-style:none}.check-list li{position:relative;padding-left:30px;margin:10px 0}.check-list li:before{content:"✓";position:absolute;left:0;top:1px;display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:#e7f8f1;color:var(--green);font-size:12px;font-weight:900}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}.table-wrap table{border-collapse:collapse;width:100%;min-width:640px;background:white}.table-wrap caption{text-align:left;padding:14px 16px;font-weight:800;color:var(--navy)}th,td{border-top:1px solid var(--line);padding:13px 14px;text-align:left;vertical-align:top}th{background:#f8fafc;color:#334155}.tool{border:1px solid var(--line);border-radius:20px;background:white;box-shadow:var(--shadow);padding:24px}.tool-intro{display:flex;gap:14px;align-items:flex-start;margin-bottom:16px}.field{display:grid;gap:7px;margin:14px 0}.field label,.tool legend{font-weight:800;color:#26364c}.field small{color:#69768a}.field input,.field select{width:100%;min-height:46px;border:1px solid #cbd5e1;border-radius:10px;padding:10px 12px;background:white}.field input:focus,.field select:focus{outline:3px solid rgba(37,99,235,.18);border-color:var(--blue)}fieldset{border:1px solid var(--line);border-radius:14px;margin:18px 0;padding:16px}legend{padding:0 7px}.tool button{border:0}.result{margin-top:20px;border:1px solid #b6d8ca;background:#f1fbf7;border-radius:16px;padding:20px}.result h2,.result h3{margin-top:0}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{background:white;border:1px solid #cfe8dc;border-radius:12px;padding:14px}.metric strong{display:block;font-size:22px;color:#075f43}.progress{height:10px;background:#e9eef5;border-radius:999px;overflow:hidden}.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--blue2))}.site-footer{background:var(--navy);color:#d5dfec;padding:46px 0 30px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}.site-footer a{color:#dbeafe}.site-footer h3{color:white;margin-top:0}.footer-note{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:22px;font-size:12px;color:#9fb0c6}.dev-banner{background:#fff3cd;color:#694c00;text-align:center;font-size:12px;font-weight:800;padding:6px 12px}.skip{position:absolute;left:-9999px;top:8px;z-index:100}.skip:focus{left:8px;background:white;padding:8px 12px;border-radius:8px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:3px solid #111827;outline-offset:3px}.only-mobile{display:none}.qa-badge{display:inline-flex;padding:5px 8px;border-radius:999px;background:#ecfdf5;color:#047857;font-size:11px;font-weight:800}
@media(max-width:900px){.global-nav{position:absolute;left:20px;right:20px;top:68px;display:grid;background:white;border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:var(--shadow)}.global-nav[hidden]{display:none}.nav-toggle{display:inline-flex}.article-grid{grid-template-columns:1fr}.toc{position:static}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.decision-steps{overflow:auto;grid-template-columns:repeat(5,150px)}.footer-grid{grid-template-columns:1fr 1fr}.header-row{min-height:64px}}
@media(max-width:640px){.wrap{width:min(100% - 24px,1160px)}.hero-inner{padding:38px 0 34px}.hero h1{font-size:34px}.hero .lead{font-size:16px}.grid-2,.grid-3,.grid-4,.result-grid,.footer-grid{grid-template-columns:1fr}.section{margin-bottom:42px}.card,.tool{padding:18px}.header-cta{display:none}.brand{font-size:14px}.only-mobile{display:block}.decision-steps{padding:10px 0}.decision-step{padding:6px}.hero-actions .btn{width:100%}}
@media print{.site-header,.site-footer,.decision-wrap,.hero-actions,.dev-banner,.toc,.btn,button{display:none!important}.hero{background:white;border:0}.hero-inner{padding:0}.wrap,.prose{width:100%!important;max-width:none!important}.tool,.card,.result{box-shadow:none;break-inside:avoid}a{color:black;text-decoration:none}}
