/* CheckUAE design system — light/dark, mobile-first */
:root{
  --bg:#ffffff; --bg-soft:#f6f8fa; --panel:#ffffff; --ink:#0b1526; --muted:#5b6b80;
  --line:#e4e9f0; --accent:#047857; --accent-soft:#e7f5ef; --accent-ink:#065f46;
  --gold:#b45309; --danger:#b91c1c; --shadow:0 1px 2px rgba(11,21,38,.05),0 8px 24px rgba(11,21,38,.06);
  --radius:14px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b1220; --bg-soft:#0f1729; --panel:#111c30; --ink:#e8eef7; --muted:#93a3b8;
    --line:#1e2b41; --accent:#10b981; --accent-soft:#0d2b22; --accent-ink:#34d399;
    --gold:#d97706; --danger:#f87171; --shadow:none;
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
.container{max-width:1060px;margin:0 auto;padding:0 20px}
a{color:var(--accent-ink);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.25;margin:0 0 .5em}
h1{font-size:clamp(1.7rem,4.5vw,2.5rem);letter-spacing:-.02em}
h2{font-size:clamp(1.25rem,3vw,1.6rem);letter-spacing:-.01em}
h3{font-size:1.08rem}
p{margin:.4em 0 1em}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{width:28px;height:28px;border-radius:7px}
.brand-name{font-weight:600;font-size:1.12rem;letter-spacing:-.01em}
.brand-name b{color:var(--accent-ink)}
.site-nav{display:flex;gap:22px}
.site-nav a{color:var(--muted);font-weight:500;font-size:.95rem}
.site-nav a:hover{color:var(--ink);text-decoration:none}

/* Hero */
.hero{padding:56px 0 40px;text-align:left}
.hero .lead{font-size:1.12rem;color:var(--muted);max-width:600px;margin-top:8px}
.badge{display:inline-flex;align-items:center;gap:6px;background:var(--accent-soft);color:var(--accent-ink);
  font-size:.8rem;font-weight:600;padding:4px 10px;border-radius:99px;margin-bottom:14px}
.badge.gold{background:color-mix(in srgb,var(--gold) 12%,transparent);color:var(--gold)}

/* Tool grid */
.section{padding:34px 0}
.section+.section{border-top:1px solid var(--line)}
.grid{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:640px){.grid{grid-template-columns:1fr 1fr}}
@media(min-width:960px){.grid{grid-template-columns:1fr 1fr 1fr}}
.card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow);color:var(--ink)}
a.card:hover{text-decoration:none;border-color:var(--accent)}
.card h3{margin-bottom:6px}
.card p{color:var(--muted);font-size:.93rem;margin:0}
.card .soon{display:inline-block;margin-top:10px;font-size:.78rem;font-weight:600;color:var(--muted);
  border:1px dashed var(--line);border-radius:99px;padding:2px 10px}
.card .go{display:inline-block;margin-top:10px;font-size:.85rem;font-weight:600;color:var(--accent-ink)}

/* Feature row */
.features{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:760px){.features{grid-template-columns:1fr 1fr 1fr}}
.feature h3{display:flex;align-items:center;gap:8px}
.feature p{color:var(--muted);font-size:.95rem}

/* Calculator */
.tool-head{padding:40px 0 8px}
.tool-head .sub{color:var(--muted);max-width:640px}
.calc-wrap{display:grid;gap:20px;grid-template-columns:1fr;align-items:start;padding:10px 0 8px}
@media(min-width:880px){.calc-wrap{grid-template-columns:1fr 1fr}}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px}
.field .hint{font-weight:400;color:var(--muted);font-size:.82rem;margin-top:4px}
.field input{width:100%;padding:11px 12px;font-size:1rem;color:var(--ink);background:var(--bg);
  border:1px solid var(--line);border-radius:10px;outline:none}
.field input:focus{border-color:var(--accent)}
.result-total{font-size:clamp(1.7rem,4vw,2.3rem);font-weight:700;letter-spacing:-.02em;color:var(--accent-ink);margin:2px 0 4px}
.result-label{font-size:.85rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.result-note{color:var(--muted);font-size:.9rem;margin-top:2px}
.breakdown{width:100%;border-collapse:collapse;margin-top:14px;font-size:.95rem}
.breakdown td{padding:9px 4px;border-top:1px solid var(--line)}
.breakdown td:last-child{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}
.breakdown tr.total td{border-top:2px solid var(--ink);font-weight:700}
.muted{color:var(--muted)}

/* Content blocks */
.prose{max-width:760px}
.prose h2{margin-top:1.6em}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:.35em 0}
.note{background:var(--bg-soft);border:1px solid var(--line);border-left:4px solid var(--gold);
  border-radius:10px;padding:14px 16px;font-size:.93rem;color:var(--muted)}
.formula{background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:14px 16px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem;overflow-x:auto}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:12px;padding:0;margin-bottom:10px;background:var(--panel)}
.faq summary{cursor:pointer;font-weight:600;padding:14px 16px;list-style:none;display:flex;justify-content:space-between;gap:10px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--muted);font-weight:400}
.faq details[open] summary:after{content:"–"}
.faq .a{padding:0 16px 14px;color:var(--muted);font-size:.96rem}

/* Sources */
.src-list{font-size:.9rem;color:var(--muted)}
.src-list li{margin:.3em 0}
.stamp{font-size:.83rem;color:var(--muted)}

/* Footer */
.site-footer{border-top:1px solid var(--line);margin-top:48px;padding:30px 0 40px;font-size:.9rem}
.foot-brand{font-weight:600}
.foot-note{color:var(--muted);max-width:640px}
.foot-links{display:flex;gap:18px;flex-wrap:wrap;margin:10px 0}
.foot-links a{color:var(--muted)}
.foot-copy{color:var(--muted);font-size:.83rem}