*{box-sizing:border-box}
:root{
  --ink:#16181d; --mid:#555c66; --soft:#7a828d; --line:#e3e6ea; --bg:#fff;
  --tint:#f5f7f9; --accent:#1656c4; --good:#0b7a52; --warn:#8a5a00;
  --shadow:0 1px 2px rgba(20,24,32,.05),0 6px 18px rgba(20,24,32,.05);
}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:20}
.hrow{display:flex;align-items:center;gap:16px;height:60px}
/* Brand: the mark and the name are the same blue. "kit" sits lighter so the
   name reads as one word with a tail, not three words run together. */
.logo{display:flex;align-items:center;gap:10px;font-size:18.5px;color:var(--accent);letter-spacing:-.45px;flex:none}
.wm{font-weight:500;color:#4a7fd8}
.wm b{font-weight:750;color:var(--accent)}
.logo:hover{text-decoration:none}
nav.top{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
nav.top a{padding:6px 10px;border-radius:7px;color:var(--mid);font-size:14px;font-weight:500}
nav.top a:hover{background:var(--tint);text-decoration:none;color:var(--ink)}
nav.top a[aria-current]{background:var(--tint);color:var(--ink)}

/* the tool */
.tool{background:var(--tint);border:1px solid var(--line);border-radius:14px;padding:18px;margin:22px 0;box-shadow:var(--shadow)}
/* Four controls, four columns. With three columns the TO field wrapped onto a
   second row, which reads as a broken control. It only stacks when the screen
   genuinely cannot hold one row. */
.tool .grid{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1fr) auto minmax(0,1fr);gap:12px;align-items:end}
.fld{min-width:0}
.fld label{display:block;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.6px;color:var(--soft);margin-bottom:5px}
.fld input,.fld select{width:100%;font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);min-width:0}
.fld input:focus,.fld select:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}
.fld input.val{font-size:21px;font-weight:600;font-variant-numeric:tabular-nums}
.swap{border:1px solid var(--line);background:#fff;border-radius:9px;width:42px;height:42px;cursor:pointer;color:var(--mid);font-size:17px;line-height:1;margin-bottom:1px}
.swap:hover{background:var(--tint);color:var(--ink)}
.out{margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.out .big{font-size:30px;font-weight:700;letter-spacing:-.6px;font-variant-numeric:tabular-nums;word-break:break-word}
.out .eq{color:var(--soft);font-size:14px;margin-top:5px}
.out .fx{color:var(--mid);font-size:14px;margin-top:9px;font-variant-numeric:tabular-nums}
@media(max-width:860px){
  .tool .grid{grid-template-columns:minmax(0,1fr);gap:10px}
  .swap{width:100%;height:38px;margin:0}
  .out .big{font-size:25px}
}

/* content */
h1{font-size:31px;line-height:1.2;letter-spacing:-.7px;margin:26px 0 8px}
h2{font-size:21px;letter-spacing:-.3px;margin:32px 0 10px}
h3{font-size:16px;margin:22px 0 6px}
p{margin:0 0 13px;color:var(--mid);max-width:72ch}
.lede{font-size:17px;color:var(--mid)}
.crumb{font-size:13px;color:var(--soft);margin-top:18px}
.crumb a{color:var(--soft)}

/* tables */
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:11px;margin:14px 0}
table{border-collapse:collapse;width:100%;font-size:14.5px}
th,td{padding:9px 13px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
th{background:var(--tint);font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--soft);font-weight:600}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:var(--tint)}
td.n{font-variant-numeric:tabular-nums;text-align:right}
td.note{white-space:normal;color:var(--mid);font-size:13.5px;min-width:260px}

/* cards + link web */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(216px,1fr));gap:12px;margin:16px 0}
.card{display:block;border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff;color:var(--ink);box-shadow:var(--shadow);min-width:0}
.card:hover{text-decoration:none;border-color:var(--accent);transform:translateY(-1px)}
.card .ic{width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;margin-bottom:9px}
.card b{display:block;font-size:15px;margin-bottom:3px}
.card span{display:block;font-size:13px;color:var(--soft);line-height:1.45}
.web{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0;max-width:100%;min-width:0}
.web a{font-size:13.5px;padding:5px 10px;border:1px solid var(--line);border-radius:20px;color:var(--mid);background:#fff;white-space:nowrap;max-width:100%;overflow:hidden;text-overflow:ellipsis}
.web a:hover{text-decoration:none;border-color:var(--accent);color:var(--accent)}

.callout{border:1px solid var(--line);border-left:3px solid var(--warn);background:var(--tint);border-radius:0 11px 11px 0;padding:13px 16px;margin:16px 0}
.callout p{margin:0;color:var(--ink);font-size:14.5px}
.callout b{color:var(--warn)}

footer{border-top:1px solid var(--line);margin-top:52px;padding:26px 0 44px;color:var(--soft);font-size:13.5px}
footer .fl{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:12px}
footer a{color:var(--mid)}

/* The grouped directory. Columns are balanced at build time, so this is a
   plain flex row of real columns rather than CSS `columns` guessing. Bullets
   and underlines because a list of links should look like a list of links. */
.dir{display:flex;gap:34px;align-items:flex-start;margin:14px 0}
.dcol{flex:1 1 0;min-width:0}
@media(max-width:860px){.dir{flex-wrap:wrap;gap:0 28px}.dcol{flex:1 1 44%}}
@media(max-width:520px){.dcol{flex:1 1 100%}}
.dgrp{margin:0 0 20px}
/* Group headings read as headings: black and plain, not grey small-caps. */
.dgrp h3{margin:0 0 8px;font-size:15px;font-weight:700;letter-spacing:-.2px;color:var(--ink)}
.dgrp ul{margin:0;padding:0 0 0 20px;list-style:disc}
.dgrp li{margin:0 0 3px;line-height:1.55}
.dgrp li::marker{color:var(--line)}
.dgrp a{font-size:14.5px;color:var(--accent);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px;text-decoration-color:rgba(22,86,196,.35)}
.dgrp a:hover{text-decoration-color:var(--accent)}
.dgrp a[aria-current]{color:var(--ink);font-weight:600;text-decoration-color:var(--ink)}
footer .dir{margin-bottom:22px}

/* header search — the only navigation that scales to 76 categories */
.hrow{gap:14px}
.search{position:relative;flex:1 1 auto;max-width:430px;margin-left:auto;display:flex;align-items:center}
.search .si{position:absolute;left:11px;color:var(--soft);pointer-events:none}
.search input{width:100%;font:inherit;font-size:14.5px;padding:9px 12px 9px 33px;border:1px solid var(--line);border-radius:9px;background:var(--tint);color:var(--ink);min-width:0}
.search input:focus{outline:none;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(22,86,196,.13)}
.search input::-webkit-search-cancel-button{cursor:pointer}
.qres{position:absolute;top:calc(100% + 6px);left:0;right:0;margin:0;padding:5px;list-style:none;background:#fff;border:1px solid var(--line);border-radius:11px;box-shadow:0 10px 34px rgba(20,24,32,.14);max-height:70vh;overflow:auto;z-index:40}
.qres li{margin:0}
.qres a{display:flex;align-items:baseline;gap:9px;padding:8px 10px;border-radius:7px;color:var(--ink)}
.qres a:hover,.qres li.on a{background:var(--tint);text-decoration:none}
.qres b{font-weight:600;font-size:14.5px}
.qres span{font-size:12.5px;color:var(--soft);margin-left:auto;white-space:nowrap}
.qnone{padding:10px;color:var(--soft);font-size:14px}
.allbtn{flex:none;font-size:14px;font-weight:600;color:var(--mid);padding:8px 12px;border:1px solid var(--line);border-radius:9px}
.allbtn:hover{text-decoration:none;border-color:var(--accent);color:var(--accent)}
@media(max-width:760px){
  .hrow{height:auto;flex-wrap:wrap;padding:10px 0;gap:10px}
  .logo{order:1}.allbtn{order:2;margin-left:auto}.search{order:3;flex:1 1 100%;max-width:none;margin:0}
}

/* content + right rail. The rail holds the ad slot and the converter list;
   it drops below the content when there is not room for both honestly. */
.cols{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}
@media(max-width:1000px){.cols{grid-template-columns:minmax(0,1fr);gap:0}}
main{min-width:0}
.rail{position:sticky;top:76px;min-width:0}
@media(max-width:1000px){.rail{position:static;margin-top:34px}}
.railbox{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.railbox h2{margin:0;background:var(--ink);color:#fff;font-size:13.5px;font-weight:600;padding:10px 14px}
.railbox h3{margin:13px 14px 5px;font-size:13.5px;font-weight:700;letter-spacing:-.1px;color:var(--ink)}
.railbox ul{margin:0;padding:0 14px 8px 30px;list-style:disc}
.railbox li{margin:0 0 2px;line-height:1.5}
.railbox li::marker{color:var(--line)}
.railbox a{font-size:13.5px;color:var(--accent);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px;text-decoration-color:rgba(22,86,196,.32)}
.railbox a:hover{text-decoration-color:var(--accent)}
.railbox a[aria-current]{color:var(--ink);font-weight:600}
.railbox>div{max-height:calc(100vh - 120px);overflow:auto}
/* ad slots: only ever present when a real slot id exists */
.ad{margin:20px 0;text-align:center}
.ad-rail{margin:0 0 18px}