:root{
  --navy:#0b2545; --blue:#134074; --accent:#1b9aaa; --gold:#f4a300;
  --bg:#f7f9fb; --card:#ffffff; --ink:#1c2b3a; --muted:#5b6b7c; --line:#e3e9ef;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}
.site-header{background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;padding:22px 0}
.site-header .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:14px;background:var(--gold);color:var(--navy);font-size:30px;font-weight:800}
.brand h1{font-size:26px;letter-spacing:.3px}
.tagline{color:#c9d8e8;font-size:14px}
.updated-badge{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);padding:8px 14px;border-radius:999px;font-size:14px}
main{padding:8px 0 40px}
.hero{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px;margin:24px 0}
.hero h2{font-size:24px;margin-bottom:8px;color:var(--navy)}
.hero p{color:var(--muted);max-width:70ch}
section{margin:30px 0}
section h2{font-size:21px;color:var(--navy);margin-bottom:4px}
.section-note{color:var(--muted);font-size:14px;margin-bottom:12px}
.table-scroll{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;min-width:640px;font-size:15px}
th{background:var(--navy);color:#fff;text-align:left;padding:12px 14px;font-weight:600;white-space:nowrap}
td{padding:12px 14px;border-top:1px solid var(--line);white-space:nowrap}
tbody tr:nth-child(even){background:#f2f6fa}
td.rate{font-weight:700;color:var(--blue);font-size:16px}
td .asof{color:var(--muted);font-size:13px}
td small{color:var(--muted)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.ad-slot{min-height:90px;border:1px dashed #b9c6d2;border-radius:10px;margin:26px 0;display:flex;align-items:center;justify-content:center;color:#93a3b5;font-size:13px}
.ad-slot:empty::after{content:"Advertisement"}
.methodology{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px}
.methodology h2{margin-bottom:10px}
.methodology h3{margin:18px 0 8px;font-size:16px;color:var(--navy)}
.methodology ul{padding-left:20px;color:var(--muted);font-size:14px}
.methodology li{margin-bottom:6px}
.site-footer{background:var(--navy);color:#c9d8e8;padding:20px 0;font-size:13px;text-align:center;margin-top:20px}
html{scroll-behavior:smooth}
.site-nav{background:#08203c;border-top:1px solid rgba(255,255,255,.14)}
.site-nav .wrap{display:flex;align-items:center}
.nav-dropdown{position:relative}
.nav-dropbtn{background:none;border:0;color:#fff;font-size:15px;font-weight:600;padding:12px 16px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;font-family:inherit}
.nav-dropbtn:hover,.nav-dropdown.open .nav-dropbtn{background:rgba(255,255,255,.1)}
.nav-dropbtn .caret{font-size:12px}
.nav-menu{position:absolute;top:100%;left:0;min-width:210px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 32px rgba(11,37,69,.2);padding:6px;display:none;z-index:60}
.nav-dropdown.open .nav-menu{display:block}
.nav-menu a{display:block;padding:10px 14px;color:var(--ink);border-radius:8px;font-size:15px;font-weight:500}
.nav-menu a:hover{background:#f2f6fa;text-decoration:none;color:var(--blue)}
section[id]{scroll-margin-top:12px}
#back-top{position:fixed;right:22px;bottom:22px;width:48px;height:48px;border-radius:50%;border:0;background:var(--navy);color:#fff;font-size:22px;font-weight:700;cursor:pointer;box-shadow:0 8px 24px rgba(11,37,69,.35);opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .25s,transform .25s;z-index:70}
#back-top.show{opacity:1;pointer-events:auto;transform:none}
#back-top:hover{background:var(--blue)}
@media(max-width:640px){
  .brand h1{font-size:21px}
  .hero h2{font-size:20px}
  table{font-size:14px}
}