:root{--bg:#f6f8fb;--surface:#fff;--surface2:#eef4f8;--ink:#1d2630;--muted:#5b6875;--line:#d9e2ea;--brand:#15435f;--brand2:#226987;--accent:#b96f21;--good:#2e6f4e;--shadow:0 14px 30px rgba(20,45,65,.08);--radius:18px;--max:1480px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.62;font-size:17px}a{color:#0f5d83;text-decoration-thickness:.08em;text-underline-offset:.18em}a:hover{color:#08364d}.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}.skip-link{position:absolute;left:-9999px;top:8px;background:#fff;padding:10px;z-index:10;border:2px solid var(--brand)}.skip-link:focus{left:8px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5;box-shadow:0 2px 14px rgba(0,0,0,.03)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);min-width:260px}.brand img{width:44px;height:44px}.brand-text{display:flex;flex-direction:column;line-height:1.1}.brand-text strong{font-size:1.02rem}.brand-text span{font-size:.82rem;color:var(--muted)}.nav{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}.nav a{color:#26323d;text-decoration:none;font-weight:650;font-size:.94rem;padding:8px 10px;border-radius:999px}.nav a:hover,.nav a[aria-current=page]{background:var(--surface2);color:var(--brand)}
.noticebar{background:#fff9ec;border-bottom:1px solid #f3d4a9;color:#53360a}.noticebar .wrap{padding-top:9px;padding-bottom:9px;font-size:.94rem}.hero{background:linear-gradient(135deg,#e9f2f6 0%,#fff7ec 55%,#fff 100%);border-bottom:1px solid var(--line)}.hero .wrap{padding-top:46px;padding-bottom:44px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(340px,.75fr);gap:34px;align-items:center}.eyebrow{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;color:var(--brand);font-weight:700;font-size:.92rem;margin-bottom:14px}.hero h1{font-size:clamp(2.1rem,5vw,4.25rem);line-height:1.04;margin:.1em 0 .22em;letter-spacing:-.045em}.lead{font-size:1.2rem;color:#394957;max-width:880px}.hero-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:11px 16px;text-decoration:none;font-weight:750;border:1px solid var(--brand);background:var(--brand);color:#fff}.btn:hover{background:#0f3145;color:#fff}.btn.secondary{background:#fff;color:var(--brand)}.btn.secondary:hover{background:var(--surface2);color:#0f3145}.btn.small{padding:8px 12px;font-size:.92rem}
.section{padding:34px 0}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:0 8px 18px rgba(20,45,65,.05)}.card h3{margin-top:0}.muted{color:var(--muted)}.kicker{color:var(--accent);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.78rem}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:28px;align-items:start;padding:34px 0}.article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px;min-width:0}.article h1{font-size:clamp(2rem,4vw,3.35rem);line-height:1.08;margin-top:0;letter-spacing:-.035em}.article h2{font-size:1.55rem;line-height:1.22;margin-top:1.6em}.article h3{font-size:1.15rem;margin-top:1.2em}.answer-box{background:#f1f7fa;border-left:5px solid var(--brand2);border-radius:12px;padding:16px 18px;margin:22px 0}.toc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;position:sticky;top:88px}.toc h2{font-size:1.05rem;margin-top:0}.toc a{display:block;padding:7px 0;text-decoration:none;border-bottom:1px solid #edf2f6;color:#334}.toc a:hover{color:var(--brand)}.breadcrumb{font-size:.92rem;color:var(--muted);margin-bottom:16px}.breadcrumb a{text-decoration:none;color:var(--muted)}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px;margin:18px 0;background:#fff}table{width:100%;border-collapse:collapse;min-width:700px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:12px 14px;vertical-align:top}th{background:#eef4f8;color:#1c3b4f}tr:last-child td{border-bottom:0}.note{background:#fff8ed;border:1px solid #f2d2a6;border-radius:14px;padding:16px;margin:18px 0;color:#50320a}.good{background:#eef8f2;border:1px solid #bddbc8;border-radius:14px;padding:16px;margin:18px 0}.checklist{display:grid;gap:10px;margin:18px 0}.check{display:flex;gap:10px;align-items:flex-start;background:#fbfcfd;border:1px solid var(--line);padding:12px;border-radius:12px}.check:before{content:"✓";color:var(--good);font-weight:900}.related{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px}.related a{display:block;background:#f7fafc;border:1px solid var(--line);border-radius:12px;padding:14px;text-decoration:none;font-weight:700}.related a:hover{background:#eef4f8}
.calc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin:22px 0}.calc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.field label{display:block;font-weight:750;margin-bottom:6px}.field input,.field select{width:100%;padding:12px;border:1px solid #cbd7df;border-radius:12px;background:#fff;font:inherit}.calc-result{background:#eff7f5;border:1px solid #bddbd0;border-radius:14px;padding:18px;margin-top:18px}.calc-result strong{font-size:1.25rem}.diagram{display:grid;grid-template-columns:repeat(4,minmax(180px,1fr));gap:12px;margin:22px 0;overflow-x:auto;padding-bottom:4px}.step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;min-width:180px}.step strong{display:block;color:var(--brand);margin-bottom:5px}.glossary-list{columns:2;column-gap:34px}.glossary-list li{break-inside:avoid;margin:0 0 12px}.searchbox input{width:100%;padding:12px;border:1px solid #cbd7df;border-radius:12px;font:inherit}.site-footer{background:#132838;color:#d8e3ea;margin-top:40px}.site-footer a{color:#fff}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:24px;padding:34px 0}.footer-grid h2,.footer-grid h3{color:#fff;margin-top:0;font-size:1.05rem}.footer-bottom{border-top:1px solid rgba(255,255,255,.15);padding:16px 0;color:#aac0cc;font-size:.94rem}.footer-bottom p{margin:0}
@media (max-width:950px){.hero-grid,.article-layout{grid-template-columns:1fr}.toc{position:static}.grid,.grid.two,.footer-grid{grid-template-columns:1fr}.calc-grid{grid-template-columns:1fr}.related{grid-template-columns:1fr}.glossary-list{columns:1}.header-inner{align-items:flex-start;flex-direction:column}.nav{justify-content:flex-start}.brand{min-width:0}.article{padding:24px}.hero .wrap{padding-top:30px}.diagram{grid-template-columns:repeat(4,220px)}}@media print{.site-header,.site-footer,.toc,.noticebar,.cta-row,.calc-actions{display:none}.article-layout{display:block}.article{box-shadow:none;border:0}.wrap{max-width:100%;padding:0}body{background:#fff;color:#000}}