:root{
  --ink:#10222e;
  --ink-soft:#44525c;
  --muted:#6b7780;
  --bg:#f6f4ef;
  --paper:#ffffff;
  --line:#e3ded3;
  --brand:#0d4a5c;
  --brand-deep:#08313d;
  --accent:#e0a034;
  --accent-soft:#fbf0db;
  --good:#1f7a55;
  --warn:#b4532a;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,34,46,.06),0 8px 24px rgba(16,34,46,.06);
  --max:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:17px}
img,svg{max-width:100%;height:auto}
a{color:var(--brand);text-underline-offset:3px}
a:hover{color:var(--brand-deep)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:20}

/* header */
.site-header{background:var(--brand-deep);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}
.logo{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;font-size:19px;letter-spacing:-.2px}
.logo:hover{color:#fff}
.logo span b{color:var(--accent);font-weight:800}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{color:#d7e6ea;text-decoration:none;font-size:15px;font-weight:600;padding:8px 12px;border-radius:8px}
.nav a:hover,.nav a[aria-current=page]{background:rgba(255,255,255,.09);color:#fff}
.menu-btn{display:none;background:none;border:1px solid rgba(255,255,255,.3);color:#fff;border-radius:8px;padding:6px 10px;font:inherit;font-size:14px}
@media (max-width:860px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--brand-deep);flex-direction:column;padding:8px 20px 16px}
  .nav.open{display:flex}
}

/* hero */
.hero{background:linear-gradient(160deg,var(--brand-deep) 0%,var(--brand) 100%);color:#fff;padding:40px 0 56px}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:start}
.hero h1{font-size:clamp(28px,4.2vw,44px);line-height:1.15;margin:6px 0 14px;letter-spacing:-.6px}
.hero p.lead{color:#cfe1e6;font-size:18px;margin:0 0 18px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;color:var(--accent)}
.hero-points{list-style:none;padding:0;margin:0;display:grid;gap:8px;color:#d7e6ea;font-size:15.5px}
.hero-points li{display:flex;gap:10px;align-items:flex-start}
.hero-points li::before{content:"";flex:0 0 8px;height:8px;border-radius:50%;background:var(--accent);margin-top:9px}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr}.hero-points{display:none}.hero{padding:28px 0 36px}}

/* converter */
.converter{background:var(--paper);color:var(--ink);border-radius:18px;padding:22px;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.converter h2{font-size:18px;margin:0 0 4px}
.rate-line{font-size:14px;color:var(--muted);margin:0 0 16px}
.rate-big{font-size:30px;font-weight:800;letter-spacing:-.5px;color:var(--brand-deep);font-variant-numeric:tabular-nums}
.field{display:block;margin-bottom:12px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--ink-soft);margin-bottom:6px}
.field .box{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:12px;background:#fbfaf7;overflow:hidden}
.field .box:focus-within{border-color:var(--brand)}
.field .cur{padding:0 14px;font-weight:800;color:var(--brand);border-right:1.5px solid var(--line);align-self:stretch;display:flex;align-items:center;background:#f1efe8;min-width:74px;justify-content:center}
.field input{border:0;background:transparent;font:inherit;font-size:22px;font-weight:700;padding:12px 14px;width:100%;color:var(--ink);font-variant-numeric:tabular-nums}
.field input:focus{outline:none}
.swap{display:flex;justify-content:center;margin:-2px 0 10px}
.swap button{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:6px 16px;font:inherit;font-size:14px;font-weight:700;color:var(--brand);cursor:pointer}
.swap button:hover{border-color:var(--brand)}
.note{font-size:13px;color:var(--muted);margin:10px 0 0;line-height:1.55}
.manual{display:none;margin-top:12px;padding:12px;border-radius:10px;background:var(--accent-soft);font-size:14px}
.manual.show{display:block}
.manual input{width:140px;font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:8px}

/* layout */
main{display:block}
.section{padding:44px 0}
.section.alt{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.grid-2{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px}
@media (max-width:960px){.grid-2{grid-template-columns:1fr}}
.prose h2{font-size:clamp(22px,2.6vw,28px);line-height:1.25;margin:36px 0 12px;letter-spacing:-.3px}
.prose h3{font-size:19px;margin:26px 0 8px}
.prose p,.prose li{color:#23343f}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:6px 0}
.prose>*:first-child{margin-top:0}
.answer{background:var(--paper);border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:12px;padding:18px 20px;margin:18px 0;box-shadow:var(--shadow)}
.answer strong.num{font-size:24px;color:var(--brand-deep);font-variant-numeric:tabular-nums}
.callout{background:var(--accent-soft);border-radius:12px;padding:16px 18px;margin:18px 0;font-size:15.5px}
.callout.info{background:#e8f1f3}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--paper);margin:16px 0}
table{border-collapse:collapse;width:100%;font-size:15.5px;font-variant-numeric:tabular-nums}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line)}
th{background:#f1efe8;font-size:13.5px;text-transform:uppercase;letter-spacing:.4px;color:var(--ink-soft)}
tr:last-child td{border-bottom:0}
td.r,th.r{text-align:right}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#eef3f4;border-radius:8px;padding:12px 14px;display:block;font-size:15px;overflow-x:auto}

/* sidebar */
.side .card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:18px;box-shadow:var(--shadow)}
.side h3{font-size:15px;margin:0 0 10px;text-transform:uppercase;letter-spacing:.5px;color:var(--ink-soft)}
.side ul{list-style:none;margin:0;padding:0}
.side li{border-top:1px solid var(--line)}
.side li:first-child{border-top:0}
.side li a{display:block;padding:9px 0;text-decoration:none;font-weight:600;font-size:15px;line-height:1.4}
.mini-rate{font-size:26px;font-weight:800;color:var(--brand-deep);font-variant-numeric:tabular-nums}
@media (min-width:961px){.side{position:sticky;top:84px;align-self:start}}

/* page head */
.page-head{background:var(--brand-deep);color:#fff;padding:34px 0 30px}
.page-head h1{font-size:clamp(26px,3.6vw,38px);line-height:1.2;margin:8px 0 10px;letter-spacing:-.4px}
.page-head p{color:#cfe1e6;margin:0;max-width:760px}
.crumbs{font-size:13.5px;color:#9fbcc4}
.crumbs a{color:#cfe1e6;text-decoration:none}
.meta{font-size:13.5px;color:#9fbcc4;margin-top:10px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
@media (max-width:900px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.cards{grid-template-columns:1fr}}
.card-link{display:block;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.card-link:hover{transform:translateY(-2px);border-color:var(--brand);color:var(--ink)}
.card-link .tag{font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.6px;color:var(--accent)}
.card-link h2.card-title,.card-link h3{font-size:17px;margin:6px 0 6px;line-height:1.35}
.card-link p{margin:0;font-size:14.5px;color:var(--ink-soft);line-height:1.55}

/* faq */
.faq details{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:0 18px;margin:10px 0}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--brand);font-weight:800}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 14px}

/* footer */
.site-footer{background:#0a2530;color:#b9cbd1;padding:40px 0 24px;margin-top:40px;font-size:15px}
.site-footer .cols{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:28px}
@media (max-width:760px){.site-footer .cols{grid-template-columns:1fr}}
.site-footer h2.fh{color:#fff;font-size:14px;text-transform:uppercase;letter-spacing:.6px;margin:0 0 10px}
.site-footer a{color:#d7e6ea;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:6px 0}
.disclaimer{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding-top:18px;font-size:13.5px;color:#8fa6ae}

.fig{margin:0 0 24px}
.fig img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;border-radius:14px;box-shadow:var(--shadow);background:#dfe7e9}
.prose .fig{margin:24px 0}
.prose>.fig:first-child{margin-top:0}
.fig figcaption{font-size:13.5px;color:var(--muted);margin-top:8px}
.card-link .thumb{display:block;width:calc(100% + 36px);max-width:none;margin:-18px -18px 14px;height:auto;aspect-ratio:16/9;object-fit:cover;border-radius:14px 14px 0 0}
.card-link{overflow:hidden}