/* UnitCharts — minimal, fast, mobile-first */
:root{
  --bg:#ffffff; --panel:#f7f9fb; --line:#e3e8ee; --ink:#15202b; --ink2:#4a5b6b; --ink3:#5f7385;
  --accent:#0f62a8; --accent-soft:#eaf3fb;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
::placeholder{color:#63768a;opacity:1}
body{margin:0;font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.55;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 18px}
header.site{border-bottom:1px solid var(--line);background:#fff}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:60px}
.brand{font-weight:650;letter-spacing:-.01em;font-size:17px;color:var(--ink)}
.brand span{color:var(--accent)}
nav.site{display:flex;gap:0;overflow-x:auto;white-space:nowrap;scrollbar-width:none;-ms-overflow-style:none;max-width:100%;min-width:0;flex:1 1 auto;justify-content:flex-end}
nav.site::-webkit-scrollbar{display:none}
nav.site a{color:var(--ink2);font-size:14px;margin-left:18px;padding:4px 0;border-bottom:2px solid transparent;flex:0 0 auto}
nav.site a.on{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
main{padding:28px 0 64px}
h1{font-size:26px;line-height:1.25;letter-spacing:-.02em;margin:0 0 8px}
h2{font-size:17px;margin:32px 0 10px;letter-spacing:-.01em}
p.lede{color:var(--ink2);margin:0 0 20px;max-width:70ch;font-size:15px}
.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0 12px}
input[type=search],select{font:inherit;font-size:16px;padding:11px 13px;border:1px solid var(--line);
  border-radius:8px;background:#fff;color:var(--ink);min-width:0;height:46px}
select{cursor:pointer}
input[type=search]{flex:1 1 220px}
input[type=search]:focus,select:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.count{font-size:13px;color:var(--ink2);margin-left:auto;font-variant-numeric:tabular-nums}
.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch;
  background:
    linear-gradient(to right,#fff 30%,rgba(255,255,255,0)) left center,
    linear-gradient(to left,#fff 30%,rgba(255,255,255,0)) right center,
    radial-gradient(farthest-side at 0 50%,rgba(21,32,43,.13),rgba(21,32,43,0)) left center,
    radial-gradient(farthest-side at 100% 50%,rgba(21,32,43,.13),rgba(21,32,43,0)) right center;
  background-repeat:no-repeat;
  background-size:38px 100%,38px 100%,14px 100%,14px 100%;
  background-attachment:local,local,scroll,scroll;
  border:1px solid #cfd8e0;border-radius:10px;box-shadow:0 1px 2px rgba(21,32,43,.04);background:#fff}
table{width:100%;border-collapse:separate;border-spacing:0;font-size:14.5px;background:transparent;min-width:520px}
thead th{border-bottom:2px solid #cfd8e0}
tbody tr:nth-child(even){background:#fbfcfd}
th,td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--panel);font-weight:600;font-size:13px;color:var(--ink2);
  text-transform:uppercase;letter-spacing:.04em;position:sticky;top:0;z-index:1}
td.num,th.num{text-align:right;font-family:var(--mono);font-size:13.5px;font-variant-numeric:tabular-nums}
tbody tr:hover{background:var(--accent-soft)}
tbody tr:last-child td{border-bottom:0}
.empty{padding:28px;text-align:center;color:var(--ink3);font-size:14px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:22px}
.card{border:1px solid var(--line);border-radius:10px;padding:16px 16px 14px;background:#fff;
  transition:border-color .12s,box-shadow .12s}
.card:hover{border-color:var(--accent);box-shadow:0 2px 10px rgba(15,98,168,.07);text-decoration:none}
.card h3{margin:0 0 6px;font-size:15.5px;color:var(--ink)}
.card p{margin:0;font-size:13.5px;color:var(--ink3);line-height:1.45}
.card .tag{display:inline-block;font-size:11.5px;color:var(--accent);background:var(--accent-soft);
  padding:2px 7px;border-radius:5px;margin-bottom:9px;font-weight:600;letter-spacing:.02em}
footer.site{border-top:1px solid var(--line);padding:20px 0;color:var(--ink3);font-size:13px}
footer.site a{color:var(--ink2)}
.note{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:8px;padding:12px 14px;font-size:13.5px;color:var(--ink2);margin:18px 0}
.crumb{font-size:13px;color:var(--ink3);margin-bottom:6px}
@media (max-width:600px){
  h1{font-size:21px}
  .wrap{padding:0 14px}
  main{padding:20px 0 48px}
  th,td{padding:12px 11px}
  td,th{font-size:14px}
  td.num,th.num{font-size:13.5px}
  nav.site a{margin-left:11px;font-size:13px}
  table{min-width:480px}
  thead th{font-size:12px}
  input[type=search],select{font-size:16px;height:48px}
  .toolbar{gap:9px}
  input[type=search]{flex:1 1 100%}
  #filter{flex:1 1 auto}
  .count{flex:0 0 auto;margin-left:0;align-self:center}
  header.site .wrap{height:54px}
  .cards{grid-template-columns:1fr;gap:11px}
  .card{padding:14px}
  .note{font-size:13px;padding:11px 12px}
  table{font-size:13.5px}
}
/* keep sticky header working inside the scroll wrapper */
thead th{position:sticky;top:0;z-index:2}
.tablewrap{border-radius:10px}

/* mobile refinements */
@media (max-width:640px){
  header.site .wrap{gap:10px}
  .brand{flex:0 0 auto}
  nav.site{-webkit-overflow-scrolling:touch}
  nav.site a{margin-left:14px}
  thead th{white-space:nowrap}
  .crumb{font-size:12.5px}
}
/* subtle hint that the table scrolls sideways */
.tablewrap::after{content:'';display:block;height:0}


/* horizontal scroll affordance */
.tablewrap{position:relative}
.tablewrap::-webkit-scrollbar{height:9px}
.tablewrap::-webkit-scrollbar-track{background:#eef2f6;border-radius:0 0 10px 10px}
.tablewrap::-webkit-scrollbar-thumb{background:#b9c6d3;border-radius:5px}
.tablewrap::-webkit-scrollbar-thumb:hover{background:#94a7b8}
@media (max-width:640px){
  .tablewrap::-webkit-scrollbar{height:7px}
  header.site .wrap{padding-right:14px}
  nav.site a{margin-left:15px}
  nav.site a:last-child{margin-right:2px}
}


/* swipe hint (mobile) — appears only if the table overflows */
.tablewrap.overflowing{position:relative}
.tablewrap.overflowing::before{
  content:'\2194  swipe to see all columns';
  position:sticky;left:0;display:block;width:max-content;
  font-size:11.5px;color:#5f7385;padding:5px 10px 3px;
  letter-spacing:.01em;
}
.tablewrap.overflowing.scrolled::before{opacity:.45}
@media (min-width:641px){ .tablewrap.overflowing::before{display:none} }


/* ---------- advertisement slots (hidden until enabled in ads.js) ---------- */
.adslot{
  display:none;                      /* ads.js 会在启用后改为 block */
  margin:22px 0;
  min-height:90px;
  text-align:center;
  overflow:hidden;
}
.adslot ins{display:block}
.adslot::before{
  content:'Advertisement';
  display:block;
  font-size:10.5px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:#8b98a5;
  margin-bottom:5px;
}
@media (max-width:640px){ .adslot{margin:18px 0} }
/* ---------- informational / legal pages ---------- */
.prose{max-width:72ch}
.prose h2{margin:30px 0 10px;font-size:18px}
.prose h3{margin:22px 0 8px;font-size:15.5px;color:var(--ink2)}
.prose p,.prose li{font-size:15px;line-height:1.7;color:#2a3944}
.prose ul{margin:10px 0 14px;padding-left:22px}
.prose li{margin:5px 0}
.prose a{color:var(--accent)}
.prose .meta{font-size:13px;color:var(--ink3);margin-bottom:18px}
.callout{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:13px 15px;margin:16px 0;font-size:14px;color:var(--ink2)}
footer.site .footer-links{margin:0 0 8px;font-size:13.5px}
footer.site .footer-links a{color:var(--ink2)}
/* ---------- copy button ---------- */
.copybtn{font:inherit;font-size:14px;font-weight:550;padding:0 14px;height:46px;border-radius:8px;
  border:1px solid var(--line);background:#fff;color:var(--ink2);cursor:pointer;flex:0 0 auto;
  transition:background .12s,border-color .12s,color .12s}
.copybtn:hover{border-color:#c8d2dc;background:var(--panel)}
.copybtn.ok{border-color:#7bbf8a;background:#eefaf1;color:#22663a}
.copybtn:disabled{opacity:.45;cursor:default}

/* ---------- source / standard line ---------- */
.src{font-size:13.5px;color:var(--ink3);margin:14px 0 0;padding-top:12px;border-top:1px solid var(--line)}
.src b{color:var(--ink2);font-weight:600}

/* ---------- related charts ---------- */
.related{margin:34px 0 0;padding-top:18px;border-top:1px solid var(--line)}
.related h3{font-size:14px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink3);margin:0 0 10px;font-weight:600}
.related ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.related li{margin:0}
.related a{display:inline-block;font-size:14px;padding:7px 12px;border:1px solid var(--line);border-radius:20px;
  background:#fff;color:var(--ink2)}
.related a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

/* ---------- site search (home) ---------- */
.sitesearch{margin:22px 0 8px}
.sitesearch input{width:100%;font:inherit;font-size:17px;padding:14px 16px;border:1px solid var(--line);
  border-radius:10px;background:#fff;color:var(--ink);height:54px}
.sitesearch input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.sitelist{list-style:none;margin:14px 0 0;padding:0}
.sitelist li{padding:11px 0;border-bottom:1px solid var(--line)}
.sitelist a{font-weight:600;font-size:15.5px}
.sitelist p{margin:3px 0 0;font-size:14px;color:var(--ink2)}
.sitenone{font-size:14.5px;color:var(--ink2);margin:14px 0 0}
.tag{display:inline-block;font-size:11px;text-transform:uppercase;letter-spacing:.05em;font-weight:600;
  color:var(--accent);background:var(--accent-soft);padding:2px 7px;border-radius:4px;margin-right:6px}

@media(max-width:520px){
  .copybtn{width:100%;margin-top:2px}
  .related ul{gap:6px}
  .related a{font-size:13.5px;padding:6px 10px}
}
/* ---------- calculator ---------- */
.calc{margin:20px 0 8px;padding:18px;border:1px solid var(--line);border-radius:10px;background:var(--panel)}
.calcgrid{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:end}
@media(max-width:640px){.calcgrid{grid-template-columns:1fr;gap:12px}}
.calcf label{display:block;font-size:13px;font-weight:600;color:var(--ink2);margin:0 0 6px;
  text-transform:uppercase;letter-spacing:.04em}
.calcf input{width:100%;font:inherit;font-size:18px;padding:12px 14px;border:1px solid var(--line);
  border-radius:8px;background:#fff;color:var(--ink);height:52px}
.calcf input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.calcf select{width:100%;font:inherit;font-size:16px;padding:12px 14px;border:1px solid var(--line);
  border-radius:8px;background:#fff;height:52px}
.calcout{font-size:15px;color:var(--ink2);margin-top:10px;line-height:1.9}
.calcout b{color:var(--ink);font-size:17px;font-variant-numeric:tabular-nums}
.calcout .u{color:var(--ink3);font-size:14px}
.calceq{font-size:22px;color:var(--ink3);padding-bottom:14px;text-align:center}
@media(max-width:640px){.calceq{display:none}}
.calcnote{font-size:13px;color:var(--ink3);margin:10px 0 0}
.calcerr{color:#b03030;font-size:14px;font-weight:600}
/* ---------- bolt calculator layout ---------- */
.boltrow{display:flex;justify-content:space-between;gap:14px;padding:9px 0;border-bottom:1px solid var(--line);
  font-size:15px;align-items:baseline}
.boltrow:last-child{border-bottom:0}
.boltl{color:var(--ink2)}
.boltval{font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums;white-space:nowrap}
.calcres{margin-top:12px;font-size:15px;color:var(--ink2);font-weight:600}
/* ---------- FAQ ---------- */
.faq{margin:14px 0 4px}
.faq details{border-bottom:1px solid var(--line);padding:2px 0}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{font-size:15.5px;font-weight:600;color:var(--ink);padding:12px 26px 12px 0;cursor:pointer;
  position:relative;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';position:absolute;right:4px;top:11px;font-size:19px;font-weight:400;
  color:var(--ink3);line-height:1}
.faq details[open] summary::after{content:'\2212'}
.faq details[open] summary{color:var(--accent)}
.faq p{font-size:14.5px;line-height:1.72;color:#2a3944;margin:0 0 14px;padding-right:26px;max-width:76ch}
.copybtn+.copybtn{margin-left:8px}
@media(max-width:520px){.copybtn+.copybtn{margin-left:0}}