:root{--navy:#1f3a5f;--blue:#2e75b6;--light:#eaf1f8;--ink:#1c2733;--muted:#5b6b7b;--line:#e2e8f0;--soft:#f6f9fc}
*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.6;background:#fff}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:1000px;margin:0 auto;padding:0 22px}
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--navy);font-size:1.05rem}
.mark{width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,var(--navy),var(--blue));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:.85rem}
.navlinks{display:flex;gap:22px;font-size:.92rem;color:var(--muted)}.navlinks a{color:var(--muted)}.navlinks a:hover{color:var(--navy)}
@media(max-width:680px){.navlinks{display:none}}
.crumb{font-size:.82rem;color:var(--muted);padding:14px 0 0}.crumb a{color:var(--muted)}
.hero{padding:26px 0 18px;border-bottom:1px solid var(--line)}
h1{font-size:2rem;color:var(--navy);letter-spacing:-.5px;margin-bottom:8px}
.lead{color:var(--muted);font-size:1.05rem;max-width:680px}
.cta{margin:18px 0 4px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--navy);color:#fff;padding:11px 18px;border-radius:8px;font-weight:600;font-size:.92rem}
.btn:hover{background:#16293f;text-decoration:none}.btn.ghost{background:transparent;color:var(--navy);border:1px solid var(--navy)}.btn.ghost:hover{background:var(--light)}
section{padding:26px 0;border-bottom:1px solid var(--line)}
h2{font-size:1.3rem;color:var(--navy);margin-bottom:12px}h3{color:var(--navy);font-size:1.02rem;margin-bottom:4px}
.merv{display:grid;gap:14px;grid-template-columns:repeat(3,1fr)}@media(max-width:760px){.merv{grid-template-columns:1fr}}
.card{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:18px}
.card p{color:var(--muted);font-size:.93rem}
.box{background:var(--navy);color:#fff;border-radius:12px;padding:24px;margin:6px 0}
.box h2{color:#fff}.box p{color:#cfe0f2;margin-bottom:14px}
.faq dt{font-weight:700;color:var(--navy);margin-top:12px}.faq dd{color:var(--muted);margin:4px 0 0}
.sizes{display:flex;flex-wrap:wrap;gap:8px}.sizes a{background:var(--light);color:var(--navy);padding:7px 12px;border-radius:7px;font-size:.9rem;font-weight:600}.sizes a:hover{background:var(--blue);color:#fff;text-decoration:none}
footer{padding:28px 0;color:var(--muted);font-size:.88rem}
.fnote{color:var(--muted);font-size:.84rem;margin-top:8px}