:root{
  --paper:#F6F7F3; --ink:#171B1E; --muted:#5D6672; --line:#DCDFD6;
  --tape:#F5C51D; --tape-dark:#D9A900; --card:#FFFFFF; --link:#0F53C7;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);
  font:16px/1.6 "Inter",system-ui,sans-serif}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--tape-dark);outline-offset:2px;border-radius:4px}
.tape{height:16px;background-color:var(--tape);
  background-image:
    repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 60px),
    repeating-linear-gradient(90deg,rgba(23,27,30,.85) 0 1.5px,transparent 1.5px 12px);
  background-size:100% 100%,100% 52%;
  background-repeat:repeat-x;background-position:0 0,0 0}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header.site{display:flex;align-items:baseline;justify-content:space-between;
  gap:16px;padding:22px 0 8px;flex-wrap:wrap}
.brand{font-family:"Archivo",sans-serif;font-weight:800;font-size:1.5rem;
  letter-spacing:-.02em;color:var(--ink)}
.brand em{font-style:normal;background:var(--tape);padding:0 .18em;border-radius:3px}
.langs{display:flex;gap:4px;flex-wrap:wrap;font-size:.82rem}
.langs a,.langs span{padding:3px 8px;border-radius:99px;border:1px solid var(--line);
  color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.langs span{background:var(--ink);color:#fff;border-color:var(--ink)}
.crumbs{font-size:.82rem;color:var(--muted);margin:6px 0 2px}
.crumbs a{color:var(--muted)}
h1{font-family:"Archivo",sans-serif;font-weight:800;letter-spacing:-.025em;
  font-size:clamp(1.7rem,4.4vw,2.5rem);line-height:1.12;margin:.4em 0 .35em}
.lead{color:var(--muted);max-width:60ch;margin:0 0 22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:22px;position:relative;overflow:hidden}
.card.ruler::before{content:"";display:block;height:10px;margin:-22px -22px 18px;
  background-color:var(--tape);
  background-image:
    repeating-linear-gradient(90deg,var(--ink) 0 1.5px,transparent 1.5px 40px),
    repeating-linear-gradient(90deg,rgba(23,27,30,.8) 0 1px,transparent 1px 8px);
  background-size:100% 100%,100% 55%;background-repeat:repeat-x}
.conv{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:end}
.field label{display:block;font-size:.8rem;font-weight:600;color:var(--muted);
  text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px}
.field input{width:100%;font:600 1.35rem/1.2 "IBM Plex Mono",monospace;
  padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;
  background:#FCFCFA;color:var(--ink)}
.field input:focus{border-color:var(--ink);outline:none}
.swap{align-self:end;display:inline-flex;align-items:center;justify-content:center;
  width:46px;height:52px;border:1.5px solid var(--line);border-radius:10px;
  background:#fff;font-size:1.2rem;color:var(--ink)}
.swap:hover{background:var(--tape);border-color:var(--tape-dark);text-decoration:none}
.result{font:600 clamp(1.25rem,3.4vw,1.8rem)/1.3 "IBM Plex Mono",monospace;
  margin:20px 0 4px;word-break:break-word}
.result b{background:var(--tape);padding:0 .15em;border-radius:4px;font-weight:600}
.formula{display:inline-block;font:500 .95rem "IBM Plex Mono",monospace;
  background:#F0F1EA;border:1px solid var(--line);border-radius:8px;
  padding:6px 12px;margin-top:10px}
h2{font-family:"Archivo",sans-serif;font-weight:700;letter-spacing:-.015em;
  font-size:1.25rem;margin:36px 0 14px}
table.ct{width:100%;border-collapse:collapse;background:var(--card);
  border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:.95rem}
table.ct th,table.ct td{padding:9px 16px;text-align:right;
  font-family:"IBM Plex Mono",monospace}
table.ct th{background:var(--ink);color:#fff;font-family:"Inter",sans-serif;
  font-weight:600;font-size:.82rem;letter-spacing:.03em}
table.ct tr:nth-child(even) td{background:#FAFBF6}
table.ct td{border-top:1px solid var(--line)}
details{background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:0;margin:0 0 10px}
details summary{cursor:pointer;font-weight:600;padding:13px 16px;list-style:none}
details summary::before{content:"+";display:inline-block;width:1.2em;color:var(--tape-dark);font-weight:800}
details[open] summary::before{content:"–"}
details p{margin:0;padding:0 16px 14px 16px;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{border:1px solid var(--line);background:var(--card);border-radius:99px;
  padding:6px 13px;font-size:.85rem;color:var(--ink)}
.chips a:hover{border-color:var(--tape-dark);background:var(--tape);text-decoration:none}
.partner{border:1.5px dashed var(--tape-dark);border-radius:12px;background:#FFFDF2;
  color:var(--muted);font-size:.85rem;text-align:center;padding:26px 16px;margin:30px 0}
.ad-box{margin:30px 0;min-height:100px}
footer.site{margin:48px 0 0;padding:22px 0 34px;border-top:1px solid var(--line);
  color:var(--muted);font-size:.82rem;display:flex;justify-content:space-between;
  gap:16px;flex-wrap:wrap}
.cat h2{margin-top:30px}
.grid-cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:8px 20px;list-style:none;padding:0;margin:0}
.grid-cats li{font-size:.93rem}
.lang-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;list-style:none;padding:0;margin:28px 0}
.lang-list a{display:block;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:16px;font-weight:600;color:var(--ink)}
.lang-list a:hover{border-color:var(--tape-dark);background:var(--tape);text-decoration:none}
@media(max-width:600px){
  .conv{grid-template-columns:1fr}
  .swap{width:100%;height:42px;transform:rotate(90deg) scale(1,1);transform:none}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}