:root{
  --bg:#f6f8fb;
  --surface:#ffffff;
  --ink:#0f2540;
  --ink-soft:#475569;
  --line:#e2e8f0;
  --brand:#0f3d6e;
  --brand-ink:#0b2e54;
  --grow:#0e9f6e;
  --grow-soft:#d1fae5;
  --contrib:#3b6ea5;
  --contrib-soft:#dbe6f3;
  --accent:#b88746;
  --focus:#1d4ed8;
  --radius:14px;
  --shadow:0 1px 2px rgba(15,37,64,.06),0 8px 24px rgba(15,37,64,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.6;
}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
a{color:var(--focus)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

header.site{background:var(--surface);border-bottom:1px solid var(--line)}
.site .wrap{display:flex;align-items:center;gap:12px;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--brand-ink);text-decoration:none;font-size:17px}
.logo svg{flex:none}
nav.site-nav{margin-left:auto;display:flex;gap:22px}
nav.site-nav a{color:var(--ink-soft);text-decoration:none;font-size:14px;font-weight:500}
nav.site-nav a:hover,nav.site-nav a[aria-current=page]{color:var(--brand-ink)}
nav.site-nav a[aria-current=page]{font-weight:700}
@media (max-width:680px){nav.site-nav{display:none}}

.crumbs{font-size:13px;color:var(--ink-soft);margin:14px 0 0}
.crumbs a{text-decoration:none}

.ad{display:flex;align-items:center;justify-content:center;background:#eef2f7;border:1px dashed #c6d2e1;
    color:#94a3b8;font-size:11px;letter-spacing:.14em;text-transform:uppercase;border-radius:10px}
.ad-leaderboard{height:90px;margin:16px 0}
.ad-rect{height:250px;margin:20px 0}
.ad-sidebar{height:600px}

h1{font-size:clamp(26px,4vw,36px);line-height:1.2;margin:6px 0 8px;letter-spacing:-.01em}
.sub{color:var(--ink-soft);max-width:64ch;margin:0 0 4px;font-size:16px}

.grid{display:grid;grid-template-columns:minmax(0,2.1fr) minmax(0,1fr);gap:24px;align-items:start;margin-top:8px}
@media (max-width:960px){.grid{grid-template-columns:1fr}.ad-sidebar{height:250px}}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:22px}

.calc{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:560px){.calc{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
label{font-size:13px;font-weight:600;color:var(--ink)}
.hint{font-size:12px;color:var(--ink-soft);font-weight:400}
.control{position:relative;display:flex;align-items:center}
.control .pre,.control .post{position:absolute;color:var(--ink-soft);font-size:15px;pointer-events:none}
.control .pre{left:14px}
.control .post{right:14px}
input[type=number],select{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;
  font-size:16px;color:var(--ink);background:#fff;-moz-appearance:textfield;font-variant-numeric:tabular-nums
}
input.has-pre{padding-left:28px}
input.has-post{padding-right:40px}
input:hover,select:hover{border-color:#c3d0e0}
input:focus,select:focus{border-color:var(--focus);outline:none;box-shadow:0 0 0 3px rgba(29,78,216,.15)}
input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}

.results{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:4px}
@media (max-width:560px){.results{grid-template-columns:1fr}}
.stat{padding:16px;border-radius:12px;border:1px solid var(--line);background:#fbfdff}
.stat .k{font-size:12px;font-weight:600;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.06em}
.stat .v{font-size:clamp(22px,3.2vw,28px);font-weight:700;margin-top:4px;letter-spacing:-.01em}
.stat.total{background:var(--brand);border-color:var(--brand)}
.stat.total .k{color:#bcd2ec}
.stat.total .v{color:#fff}
.stat.interest .v{color:var(--grow)}
.stat.contrib .v{color:var(--contrib)}

.chart-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:6px}
.chart-head h2{font-size:18px;margin:0}
.legend{display:flex;gap:16px;font-size:13px;color:var(--ink-soft)}
.legend span{display:inline-flex;align-items:center;gap:7px}
.swatch{width:12px;height:12px;border-radius:3px;display:inline-block}
figure.chart{margin:0}
svg.chart-svg{width:100%;height:auto;display:block}

details.table-wrap{margin-top:6px}
summary{cursor:pointer;font-weight:600;color:var(--brand-ink);padding:10px 0;user-select:none}
summary:hover{color:var(--focus)}
table{width:100%;border-collapse:collapse;font-size:14px;margin-top:8px}
th,td{text-align:right;padding:9px 12px;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
th:first-child,td:first-child{text-align:left}
thead th{position:sticky;top:0;background:#f1f5f9;color:var(--ink);font-size:12px;text-transform:uppercase;letter-spacing:.05em}
tbody tr:hover{background:#f8fafc}
.scroll{max-height:360px;overflow:auto;border:1px solid var(--line);border-radius:10px}

.lead{border:1px solid #ead9bf;background:linear-gradient(180deg,#fffaf1,#fff);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.lead .tag{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}
.lead h3{margin:8px 0 6px;font-size:18px;color:var(--brand-ink)}
.lead p{margin:0 0 14px;color:var(--ink-soft);font-size:14.5px}
.btn{display:inline-flex;align-items:center;gap:8px;cursor:pointer;border:0;border-radius:10px;
     background:var(--brand);color:#fff;font-weight:600;font-size:15px;padding:12px 18px;text-decoration:none;
     transition:background .2s ease}
.btn:hover{background:var(--brand-ink)}
.btn.ghost{background:transparent;color:var(--brand-ink);border:1.5px solid var(--line)}
.btn.ghost:hover{background:#f1f5f9}

.content{margin-top:32px}
.content h2{font-size:22px;margin:28px 0 10px}
.content h3{font-size:17px;margin:20px 0 6px}
.content p{color:#27384d;max-width:72ch}
.formula{background:#0f2540;color:#e6eef8;padding:16px 18px;border-radius:10px;overflow-x:auto;
         font-family:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;font-size:14px}
.faq dt{font-weight:700;margin-top:16px}
.faq dd{margin:4px 0 0;color:var(--ink-soft);max-width:72ch}
.disclaimer{font-size:13px;color:#94a3b8;margin:24px 0;max-width:80ch}

/* Hub page */
.hero{padding:40px 0 8px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin:18px 0}
.tool{display:flex;flex-direction:column;gap:8px;padding:20px;text-decoration:none;color:inherit;
      background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
      transition:border-color .2s ease,box-shadow .2s ease}
.tool:hover{border-color:#bcd0e6;box-shadow:0 2px 4px rgba(15,37,64,.08),0 14px 30px rgba(15,37,64,.10)}
.tool .ic{width:40px;height:40px;border-radius:10px;background:#eaf1f9;display:flex;align-items:center;justify-content:center}
.tool h2{font-size:17px;margin:6px 0 0;color:var(--brand-ink)}
.tool p{margin:0;font-size:14px;color:var(--ink-soft)}
.tool .go{margin-top:auto;font-size:13px;font-weight:600;color:var(--focus)}
.cluster-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-soft);margin:26px 0 2px}

footer.site{border-top:1px solid var(--line);background:var(--surface);margin-top:40px}
footer.site .wrap{padding:24px 20px;color:var(--ink-soft);font-size:13px;display:flex;gap:18px;flex-wrap:wrap}
footer.site a{color:var(--ink-soft);text-decoration:none}
footer.site a:hover{color:var(--brand-ink)}

@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}