:root{
  --font-display:'Space Grotesk',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,monospace;
  --bg:#050c15; --bg-2:#081522;
  --surface:rgba(255,255,255,.045); --surface-2:rgba(255,255,255,.028);
  --glass:rgba(255,255,255,.05); --glass-brd:rgba(255,255,255,.09);
  --brd:rgba(255,255,255,.08);
  --txt:#e9f1fa; --txt-2:#9fb3c8; --txt-3:#63798f;
  --brass:#e2b857; --brass-2:#f3d68c; --brass-dim:#a9812f;
  --teal:#2fd4bd; --teal-2:#67e8d6;
  --danger:#ef6461; --ok:#4ade80;
  --radius:18px; --radius-sm:12px;
  --shadow:0 24px 60px -28px rgba(0,0,0,.85);
  --ring:rgba(226,184,87,.55);
}
html[data-theme="light"]{
  --bg:#eef2f7; --bg-2:#ffffff;
  --surface:rgba(255,255,255,.85); --surface-2:rgba(255,255,255,.6);
  --glass:rgba(255,255,255,.72); --glass-brd:rgba(15,40,70,.10);
  --brd:rgba(15,40,70,.10);
  --txt:#0d1f33; --txt-2:#46617d; --txt-3:#7d92a8;
  --brass:#a87b1c; --brass-2:#c79b2e; --brass-dim:#c9ab63;
  --teal:#0f9d8c; --teal-2:#0b8a7b;
  --shadow:0 22px 50px -30px rgba(15,40,70,.45);
  --ring:rgba(168,123,28,.55);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(226,184,87,.10), transparent 60%),
    radial-gradient(900px 560px at 92% 4%, rgba(47,212,189,.10), transparent 62%),
    linear-gradient(180deg,var(--bg-2),var(--bg) 45%);
  background-attachment:fixed;color:var(--txt);min-height:100vh;
  -webkit-font-smoothing:antialiased;line-height:1.55;
  transition:background .4s ease,color .3s ease;
}
html[data-theme="light"] body{
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(226,184,87,.18), transparent 60%),
    radial-gradient(900px 560px at 92% 4%, rgba(47,212,189,.16), transparent 62%),
    linear-gradient(180deg,var(--bg-2),var(--bg) 55%);
}
img,svg{display:block;max-width:100%}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:none}
a{color:inherit;text-decoration:none}
.wrap{width:min(1180px,92vw);margin-inline:auto}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
:focus-visible{outline:2px solid var(--ring);outline-offset:3px;border-radius:6px}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb,var(--bg) 78%,transparent);
  backdrop-filter:blur(16px) saturate(1.3);
  border-bottom:1px solid var(--brd);
}
.topbar-in{display:flex;align-items:center;gap:16px;height:66px}
.brand{display:flex;align-items:center;gap:11px;margin-right:auto}
.brand-mark{
  width:40px;height:40px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brass),var(--brass-dim));
  color:#101010;box-shadow:0 8px 22px -10px var(--brass);
}
.brand-mark svg{width:21px;height:21px;stroke-width:1.9}
.brand-txt b{font-family:var(--font-display);font-weight:600;font-size:16px;letter-spacing:.2px;display:block;line-height:1.1}
.brand-txt span{font-size:11px;color:var(--txt-3);letter-spacing:1.6px;text-transform:uppercase}
.tb-actions{display:flex;align-items:center;gap:8px}
.tb-btn{
  height:40px;min-width:40px;padding:0 13px;border-radius:11px;display:inline-flex;
  align-items:center;gap:7px;border:1px solid var(--brd);background:var(--surface);
  color:var(--txt-2);font-size:13px;font-weight:500;
  transition:transform .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.tb-btn svg{width:17px;height:17px;stroke-width:1.9}
.tb-btn:hover{transform:translateY(-2px);color:var(--txt);border-color:var(--glass-brd);background:var(--surface-2)}
.tb-btn.on{color:var(--brass);border-color:color-mix(in srgb,var(--brass) 45%,transparent)}
.tb-btn .lbl{display:inline}
@media (max-width:640px){.tb-btn .lbl{display:none}.tb-btn{padding:0}}

/* ---------- hero ---------- */
.hero{padding:clamp(34px,6vw,68px) 0 26px;text-align:center;position:relative}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;
  border:1px solid var(--glass-brd);background:var(--glass);color:var(--brass);
  font-size:12px;font-weight:600;letter-spacing:1.4px;text-transform:uppercase;
  backdrop-filter:blur(10px);margin-bottom:20px;
}
.hero-eyebrow svg{width:15px;height:15px;stroke-width:2}
.hero h1{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(2rem,5.4vw,3.6rem);line-height:1.08;letter-spacing:-.02em;
  margin-bottom:16px;
}
.hero h1 .grad{
  background:linear-gradient(100deg,var(--brass-2),var(--brass) 40%,var(--teal));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{max-width:64ch;margin:0 auto;color:var(--txt-2);font-size:clamp(.96rem,1.6vw,1.08rem)}
.hero-stats{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:26px}
.hstat{
  display:flex;align-items:center;gap:9px;padding:9px 15px;border-radius:12px;
  border:1px solid var(--brd);background:var(--surface-2);font-size:13px;color:var(--txt-2);
}
.hstat b{color:var(--txt);font-family:var(--font-mono);font-weight:500}
.hstat svg{width:15px;height:15px;stroke-width:1.9;color:var(--brass)}

/* ---------- category tabs ---------- */
.catbar{display:flex;gap:8px;overflow-x:auto;padding:4px 0 20px;scrollbar-width:none}
.catbar::-webkit-scrollbar{display:none}
.cat{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:12px;border:1px solid var(--brd);
  background:var(--surface-2);color:var(--txt-2);font-size:13.5px;font-weight:500;
  transition:transform .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.cat svg{width:17px;height:17px;stroke-width:1.8}
.cat:hover{transform:translateY(-2px);color:var(--txt);border-color:var(--glass-brd)}
.cat.on{
  background:linear-gradient(140deg,color-mix(in srgb,var(--brass) 24%,transparent),color-mix(in srgb,var(--brass) 8%,transparent));
  color:var(--brass-2);border-color:color-mix(in srgb,var(--brass) 46%,transparent);
  box-shadow:0 10px 26px -16px var(--brass);
}
html[data-theme="light"] .cat.on{color:var(--brass);}

/* ---------- converter board ---------- */
.board{
  display:grid;grid-template-columns:1fr;gap:18px;
  background:var(--glass);border:1px solid var(--glass-brd);border-radius:var(--radius);
  padding:clamp(16px,2.6vw,26px);backdrop-filter:blur(14px);box-shadow:var(--shadow);
  position:relative;overflow:hidden;
}
.board::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(520px 220px at 100% 0%,color-mix(in srgb,var(--teal) 12%,transparent),transparent 70%);
}
.conv{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:end;position:relative}
@media (max-width:760px){.conv{grid-template-columns:1fr;align-items:stretch}}
.field{display:flex;flex-direction:column;gap:8px;min-width:0}
.field label{font-size:11.5px;letter-spacing:1.3px;text-transform:uppercase;color:var(--txt-3);font-weight:600}
.inp-row{display:flex;gap:10px;min-width:0}
.val-in{
  flex:1;min-width:0;height:60px;border-radius:14px;padding:0 16px;
  background:var(--surface);border:1px solid var(--brd);
  font-family:var(--font-mono);font-size:clamp(1.15rem,3.4vw,1.5rem);font-weight:500;
  transition:border-color .18s ease,box-shadow .18s ease,background .18s ease;
}
.val-in:focus{outline:none;border-color:var(--brass);box-shadow:0 0 0 4px color-mix(in srgb,var(--brass) 20%,transparent)}
.val-out{
  flex:1;min-width:0;height:60px;border-radius:14px;padding:0 16px;display:flex;align-items:center;
  background:linear-gradient(140deg,color-mix(in srgb,var(--brass) 14%,transparent),var(--surface-2));
  border:1px solid color-mix(in srgb,var(--brass) 34%,transparent);
  font-family:var(--font-mono);font-size:clamp(1.15rem,3.4vw,1.5rem);font-weight:600;color:var(--brass-2);
  overflow-x:auto;white-space:nowrap;scrollbar-width:none;
}
.val-out::-webkit-scrollbar{display:none}
html[data-theme="light"] .val-out{color:var(--brass);}
.swap{
  width:50px;height:50px;border-radius:14px;display:grid;place-items:center;margin-bottom:5px;
  border:1px solid var(--glass-brd);background:var(--surface);color:var(--txt-2);
  transition:transform .35s cubic-bezier(.16,1,.3,1),color .2s ease,border-color .2s ease;
}
.swap svg{width:20px;height:20px;stroke-width:1.9}
.swap:hover{color:var(--brass);border-color:color-mix(in srgb,var(--brass) 45%,transparent);transform:rotate(180deg)}
@media (max-width:760px){.swap{margin:0 auto;transform:rotate(90deg)}.swap:hover{transform:rotate(270deg)}}

/* ---------- custom select ---------- */
.sel{position:relative;min-width:0}
.sel-btn{
  width:100%;height:60px;border-radius:14px;padding:0 42px 0 15px;text-align:left;
  background:var(--surface);border:1px solid var(--brd);display:flex;align-items:center;gap:10px;
  transition:border-color .18s ease,background .18s ease;position:relative;
}
.sel-btn:hover{border-color:var(--glass-brd);background:var(--surface-2)}
.sel-btn .sym{
  font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--brass);
  border:1px solid color-mix(in srgb,var(--brass) 38%,transparent);border-radius:7px;
  padding:2px 7px;flex:0 0 auto;
}
.sel-btn .nm{flex:1;min-width:0;font-size:14.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sel-btn .ar{font-size:12px;color:var(--txt-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:42%}
.sel-btn::after{
  content:"";position:absolute;right:16px;top:50%;width:8px;height:8px;
  border-right:2px solid var(--txt-3);border-bottom:2px solid var(--txt-3);
  transform:translateY(-70%) rotate(45deg);
}
.sel-panel{
  position:absolute;z-index:60;top:calc(100% + 8px);left:0;right:0;min-width:280px;
  background:color-mix(in srgb,var(--bg-2) 96%,transparent);border:1px solid var(--glass-brd);
  border-radius:14px;box-shadow:var(--shadow);padding:8px;backdrop-filter:blur(18px);
  max-height:330px;display:flex;flex-direction:column;
  animation:pop .16s cubic-bezier(.16,1,.3,1);
}
@keyframes pop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.sel-search{
  height:42px;border-radius:10px;background:var(--surface);border:1px solid var(--brd);
  padding:0 12px;margin-bottom:6px;font-size:14px;
}
.sel-search:focus{outline:none;border-color:var(--brass)}
.sel-list{overflow-y:auto;display:flex;flex-direction:column;gap:2px}
.sel-opt{
  display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:9px;
  text-align:left;transition:background .14s ease;color:var(--txt-2);font-size:14px;
}
.sel-opt:hover,.sel-opt.active{background:var(--surface);color:var(--txt)}
.sel-opt.pick{color:var(--brass)}
.sel-opt .g{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}
.sel-opt .g small{color:var(--txt-3);font-size:11.5px}
.sel-opt .v{font-family:var(--font-mono);font-size:12.5px;color:var(--txt-3)}
.sel-empty{padding:14px;text-align:center;color:var(--txt-3);font-size:13.5px}

/* ---------- quick chips + formula ---------- */
.quick{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.quick-label{font-size:11.5px;letter-spacing:1.2px;text-transform:uppercase;color:var(--txt-3);font-weight:600;margin-right:2px}
.chip{
  padding:7px 13px;border-radius:999px;border:1px solid var(--brd);background:var(--surface-2);
  font-size:12.5px;color:var(--txt-2);font-family:var(--font-mono);
  transition:transform .16s ease,color .16s ease,border-color .16s ease;
}
.chip:hover{transform:translateY(-2px);color:var(--brass);border-color:color-mix(in srgb,var(--brass) 40%,transparent)}
.formula{
  display:flex;align-items:center;gap:10px;padding:12px 15px;border-radius:12px;
  background:var(--surface-2);border:1px dashed var(--glass-brd);
  font-family:var(--font-mono);font-size:13px;color:var(--txt-2);overflow-x:auto;scrollbar-width:none;
}
.formula::-webkit-scrollbar{display:none}
.formula svg{width:16px;height:16px;stroke-width:1.9;color:var(--teal);flex:0 0 auto}
.formula b{color:var(--brass);font-weight:600}
.board-tools{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center}

/* ---------- result grid ---------- */
.grid-sec{padding:46px 0 8px}
.sec-head{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap;margin-bottom:20px}
.sec-head h2{font-family:var(--font-display);font-weight:600;font-size:clamp(1.3rem,3vw,1.85rem);letter-spacing:-.01em}
.sec-head p{color:var(--txt-3);font-size:13.5px;margin-left:auto}
.ugrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.ucard{
  position:relative;padding:15px 16px;border-radius:14px;border:1px solid var(--brd);
  background:var(--surface-2);transition:transform .2s ease,border-color .2s ease,background .2s ease,box-shadow .2s ease;
  animation:fadeUp .45s cubic-bezier(.16,1,.3,1) backwards;
}
.ucard:hover{transform:translateY(-3px);border-color:var(--glass-brd);background:var(--surface);box-shadow:0 16px 34px -22px rgba(0,0,0,.7)}
.ucard.pin{border-color:color-mix(in srgb,var(--brass) 42%,transparent)}
.ucard .t{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:9px}
.ucard .t .nm{font-size:13px;color:var(--txt-2);font-weight:500}
.ucard .t .sym{font-family:var(--font-mono);font-size:11px;color:var(--brass);border:1px solid color-mix(in srgb,var(--brass) 34%,transparent);border-radius:6px;padding:1px 6px}
.ucard .big{font-family:var(--font-mono);font-size:clamp(1.05rem,2.6vw,1.28rem);font-weight:600;letter-spacing:-.01em;word-break:break-all;line-height:1.25}
.ucard .sub{font-size:11.5px;color:var(--txt-3);margin-top:3px}
.ucard .cp{
  position:absolute;top:10px;right:10px;width:30px;height:30px;border-radius:8px;
  display:grid;place-items:center;color:var(--txt-3);opacity:0;
  transition:opacity .18s ease,color .18s ease,background .18s ease;
}
.ucard:hover .cp{opacity:1}
.ucard .cp:hover{color:var(--brass);background:var(--surface)}
.ucard .cp svg{width:15px;height:15px;stroke-width:2}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* ---------- reference table ---------- */
.ref-wrap{margin-top:14px;border:1px solid var(--brd);border-radius:16px;overflow:hidden;background:var(--surface-2)}
table.ref{width:100%;border-collapse:collapse;font-size:14px}
table.ref th,table.ref td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--brd)}
table.ref th{
  font-family:var(--font-body);font-size:11.5px;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--txt-3);font-weight:600;background:var(--surface);
}
table.ref td:first-child{color:var(--txt);font-weight:500}
table.ref td:last-child{font-family:var(--font-mono);color:var(--brass);text-align:right}
table.ref tr:last-child td{border-bottom:none}
table.ref tbody tr{transition:background .16s ease}
table.ref tbody tr:hover{background:var(--surface)}
@media (max-width:640px){table.ref th,table.ref td{padding:10px 11px;font-size:12.5px}}

/* ---------- footer ---------- */
footer.ft{margin-top:64px;border-top:1px solid var(--brd);padding:34px 0 44px;color:var(--txt-3);font-size:13px}
.ft-in{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.ft .mini{display:flex;align-items:center;gap:9px;color:var(--txt-2)}
.ft .mini svg{width:16px;height:16px;stroke-width:1.9;color:var(--brass)}
.ft a:hover{color:var(--brass)}

/* ---------- toast ---------- */
.toast{
  position:fixed;bottom:26px;left:50%;transform:translate(-50%,20px);z-index:200;
  display:flex;align-items:center;gap:10px;padding:12px 18px;border-radius:12px;
  background:color-mix(in srgb,var(--bg-2) 94%,transparent);border:1px solid var(--glass-brd);
  box-shadow:var(--shadow);backdrop-filter:blur(16px);font-size:13.5px;color:var(--txt);
  opacity:0;pointer-events:none;transition:opacity .26s ease,transform .26s cubic-bezier(.16,1,.3,1);
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast svg{width:17px;height:17px;stroke-width:2;color:var(--ok)}

/* ---------- skeleton ---------- */
.skel{height:96px;border-radius:14px;background:linear-gradient(90deg,var(--surface-2) 25%,var(--surface) 37%,var(--surface-2) 63%);background-size:400% 100%;animation:shim 1.4s infinite linear}
@keyframes shim{from{background-position:100% 0}to{background-position:0 0}}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}
/* RTL */
html[dir="rtl"] .sel-btn::after{right:auto;left:16px}
html[dir="rtl"] .sel-btn{padding:0 15px 0 42px;text-align:right}
html[dir="rtl"] .ucard .cp{right:auto;left:10px}
html[dir="rtl"] table.ref td:last-child{text-align:left}
html[dir="rtl"] table.ref th{text-align:right}
html[dir="rtl"] .brand{margin-right:0;margin-left:auto}
html[dir="rtl"] .sec-head p{margin-left:0;margin-right:auto}
html[dir="rtl"] .brand-txt span,html[dir="rtl"] .hero-eyebrow{letter-spacing:normal}

/* ---------- two-column select row + refinements ---------- */
.conv.conv-2{grid-template-columns:1fr 1fr;align-items:start}
@media (max-width:560px){.conv.conv-2{grid-template-columns:1fr}}
@media (hover:none){.ucard .cp{opacity:1}}
/* faint chart grid inside the board */
.board .conv,.board .board-tools,.board .formula{position:relative;z-index:1}