:root{
  --navy:#0b2a4a; --navy-2:#13406e; --accent:#0a8f8f; --accent-soft:#e3f4f3;
  --ink:#1b2430; --muted:#5b6675; --line:#e2e6eb; --bg:#f6f8fa; --card:#fff;
  --warn:#fff6e0; --warn-ink:#7a5300; --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:17px}
a{color:var(--navy-2)}
img{max-width:100%}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}

/* header */
.site-header{background:var(--navy);color:#fff;position:sticky;top:0;z-index:10}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.brand{color:#fff;text-decoration:none;font-weight:700;letter-spacing:.2px;display:flex;align-items:center;gap:10px;font-size:1.05rem}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);display:grid;place-items:center;font-weight:800;font-size:.8rem}
.brand small{display:block;font-weight:400;opacity:.75;font-size:.78rem;line-height:1.1}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:4px;flex-wrap:wrap}
nav a{color:#dbe6f2;text-decoration:none;padding:8px 12px;border-radius:8px;font-size:.95rem}
nav a:hover,nav a[aria-current="page"]{background:rgba(255,255,255,.12);color:#fff}

/* hero */
.hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%);color:#fff;padding:56px 0 64px}
.hero h1{font-family:"Source Serif 4",Georgia,serif;font-size:clamp(1.9rem,4.5vw,2.8rem);line-height:1.15;margin:0 0 14px;max-width:760px}
.hero p{font-size:1.15rem;max-width:640px;opacity:.9;margin:0 0 26px}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:12px 20px;border-radius:10px;font-weight:600}
.btn.ghost{background:transparent;border:1.5px solid rgba(255,255,255,.6);margin-left:8px}
.page-head{background:var(--navy);color:#fff;padding:36px 0 40px}
.page-head h1{font-family:"Source Serif 4",Georgia,serif;margin:6px 0 8px;font-size:clamp(1.6rem,3.6vw,2.3rem);line-height:1.2}
.page-head p{margin:0;opacity:.85;max-width:720px}
.crumbs{font-size:.88rem;opacity:.75}
.crumbs a{color:#fff}

/* sections */
main section{padding:44px 0}
h2{font-family:"Source Serif 4",Georgia,serif;font-size:1.6rem;margin:0 0 18px;color:var(--navy)}
h3{margin:0 0 6px;font-size:1.12rem}
.lead{font-size:1.1rem;color:var(--muted);max-width:720px}
.grid{display:grid;gap:18px}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid.cols-4{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card a.more{font-weight:600;text-decoration:none}
.card.link{text-decoration:none;color:inherit;transition:border-color .15s,transform .15s;display:block}
.card.link:hover{border-color:var(--accent);transform:translateY(-2px)}
.tag{display:inline-block;font-size:.78rem;font-weight:600;padding:3px 9px;border-radius:99px;background:var(--accent-soft);color:#06605f;margin-bottom:10px}
.tag.off{background:#eef0f3;color:var(--muted)}
.muted{color:var(--muted)}

/* key figures */
.figure{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.figure b{display:block;font-size:1.7rem;color:var(--navy);line-height:1.1;font-family:"Source Serif 4",Georgia,serif}
.figure span{font-size:.92rem;color:var(--muted)}

/* steps */
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.steps li{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 20px 20px 20px;position:relative}
.steps li::before{counter-increment:s;content:counter(s);width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:700;margin-bottom:10px}

/* article */
.article{display:grid;grid-template-columns:1fr 280px;gap:32px;align-items:start}
.article aside{position:sticky;top:84px}
.article h2{margin-top:34px}
.article h2:first-child{margin-top:0}
.article ul{padding-left:20px}
.article li{margin-bottom:6px}
.facts dl{margin:0}
.facts dt{font-size:.82rem;color:var(--muted);text-transform:uppercase;letter-spacing:.4px;margin-top:12px}
.facts dt:first-child{margin-top:0}
.facts dd{margin:2px 0 0;font-weight:600}
.video{aspect-ratio:16/9;background:repeating-linear-gradient(45deg,#e9edf2,#e9edf2 12px,#f2f5f8 12px,#f2f5f8 24px);border:1px dashed #b9c3cf;border-radius:var(--radius);display:grid;place-items:center;text-align:center;color:var(--muted);padding:20px}
.notice{background:var(--warn);color:var(--warn-ink);border-radius:var(--radius);padding:14px 18px;font-size:.95rem}
table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top;font-size:.96rem}
th{background:#eef2f6;font-size:.85rem;text-transform:uppercase;letter-spacing:.4px;color:var(--muted)}
tr:last-child td{border-bottom:0}
.table-wrap{overflow-x:auto}

/* faq */
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
summary{cursor:pointer;font-weight:600}
details p{margin:10px 0 0}

/* footer */
.site-footer{background:#0a1f36;color:#b9c6d4;padding:34px 0;font-size:.92rem;margin-top:30px}
.site-footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.site-footer a{color:#e3ebf3}

@media (max-width:820px){
  .article{grid-template-columns:1fr}
  .article aside{position:static}
  .btn.ghost{margin:10px 0 0}
  .site-header{position:static}
}