:root{--ink:#111827;--muted:#5b6472;--bg:#f6f8fb;--card:#fff;--line:#dde3ea;--accent:#126e82;--accent2:#0b4654;--soft:#e8f4f6;--warn:#fff7df}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink);line-height:1.72}a{color:var(--accent2);text-decoration-thickness:1px;text-underline-offset:2px}a:hover{color:var(--accent)}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:14px max(22px,calc((100vw - 1180px)/2));background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.brand{display:flex;gap:10px;align-items:center;color:var(--ink);text-decoration:none;font-weight:800;font-size:1.05rem}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--accent2);color:white;font-size:.75rem;letter-spacing:.05em}.site-header nav{display:flex;gap:18px}.site-header nav a{text-decoration:none;font-size:.93rem;font-weight:650}.menu-btn{display:none}.hero{padding:76px 22px 52px;max-width:1180px;margin:auto}.hero-grid{display:grid;grid-template-columns:1.35fr .8fr;gap:52px;align-items:center}.eyebrow,.label{text-transform:uppercase;letter-spacing:.12em;font-size:.75rem;font-weight:800;color:var(--accent)}h1{font-size:clamp(2.4rem,5vw,4.8rem);line-height:1.02;letter-spacing:-.045em;margin:.15em 0 .25em;max-width:900px}h2{font-size:clamp(1.45rem,2.5vw,2.05rem);line-height:1.15;letter-spacing:-.02em;margin-top:2.2em}h3{line-height:1.25}.lede{font-size:1.22rem;color:var(--muted);max-width:760px}.hero-card,.card,.sticky-card,.toc,.notice{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 8px 30px rgba(17,24,39,.04)}.hero-card{background:linear-gradient(145deg,#0b4654,#126e82);color:white}.hero-card a{color:white}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.section-wrap{max-width:1180px;margin:auto;padding:30px 22px 70px}.card h3{margin:.2em 0 .4em}.card p{color:var(--muted)}.btn{display:inline-block;background:var(--accent2);color:white!important;text-decoration:none;font-weight:800;border-radius:10px;padding:11px 16px}.btn.secondary{background:white;color:var(--accent2)!important;border:1px solid var(--line)}.layout{display:grid;grid-template-columns:minmax(0,780px) 300px;gap:46px;max-width:1180px;margin:0 auto;padding:44px 22px 90px}.layout article{background:white;border:1px solid var(--line);border-radius:18px;padding:clamp(24px,5vw,58px)}.layout article h1{font-size:clamp(2.3rem,5vw,4rem)}.layout article p,.layout article li{font-size:1.03rem}.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:25px}.meta{color:var(--muted);font-size:.88rem;border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:28px}.toc{background:var(--soft);box-shadow:none;margin:24px 0 36px}.sticky-card{position:sticky;top:84px}.fine{font-size:.78rem!important;color:var(--muted)}.source-note{border-top:1px solid var(--line);margin-top:44px;padding-top:4px}.notice{background:var(--warn);box-shadow:none}.hub-list{columns:2;column-gap:28px}.hub-list li{break-inside:avoid;margin-bottom:9px}footer{max-width:1180px;margin:auto;padding:35px 22px 60px;border-top:1px solid var(--line);color:var(--muted)}footer a{color:var(--muted)}.popup-backdrop{display:none;position:fixed;inset:0;background:rgba(8,15,20,.78);z-index:100;padding:22px;overflow:auto}.popup-backdrop.show{display:grid;place-items:center}.popup{max-width:820px;width:100%;background:white;border-radius:22px;padding:36px;position:relative}.popup-close{position:absolute;right:18px;top:14px;border:0;background:transparent;font-size:1.5rem;cursor:pointer}.popup-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.merchant-note{background:#eef8f4;border:1px solid #cfe8dd;border-radius:12px;padding:14px}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}@media(max-width:850px){.site-header nav{display:none;position:absolute;top:63px;left:0;right:0;background:white;padding:18px 22px;border-bottom:1px solid var(--line);flex-direction:column}.nav-open .site-header nav{display:flex}.menu-btn{display:block}.hero-grid,.layout,.grid,.popup-grid{grid-template-columns:1fr}.layout aside{order:-1}.sticky-card{position:static}.hub-list{columns:1}.hero{padding-top:48px}.layout{padding-top:24px}.layout article{padding:24px}h1{font-size:2.65rem}}