:root{--ink:#0E1B2C;--bg:#F3F5F8;--panel:#16202E;--lime:#D6F25C;--peri:#9AA7FF;--peach:#FFAE8F;--line:#D3DAE4;--mut:#55647A}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.65 'Bricolage Grotesque',system-ui,sans-serif;font-variant-numeric:tabular-nums}
a{color:inherit}
header,footer,main{max-width:1040px;margin:0 auto;padding:0 20px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:18px;padding-bottom:18px;gap:12px;flex-wrap:wrap}
.logo{font-weight:800;font-size:22px;text-decoration:none;letter-spacing:-.02em}
.logo b{background:var(--ink);color:var(--lime);padding:0 8px;margin-left:4px;border-radius:6px}
header nav a{margin-left:16px;text-decoration:none;font-weight:600;font-size:15px}
header nav a:hover{text-decoration:underline}
h1{font-size:clamp(34px,6vw,58px);line-height:1.05;letter-spacing:-.03em;font-weight:800;margin:.4em 0 .3em}
h2{font-size:26px;letter-spacing:-.02em;margin:1.6em 0 .5em}
h3{font-size:19px;margin:1.2em 0 .2em}
p{max-width:68ch}
.lead{color:var(--mut);font-size:19px}
.crumb{font-size:14px;color:var(--mut);margin-top:8px}
.quick{background:var(--panel);border-radius:22px;padding:22px;margin:22px 0}
.quick input{width:100%;font:inherit;font-size:26px;padding:14px 16px;border-radius:12px;border:0;background:#0B131E;color:#fff}
.quick output{display:block;color:var(--lime);font-size:34px;font-weight:800;min-height:1.4em;margin-top:8px}
.keys{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px;background:var(--panel);padding:20px;border-radius:22px}
.key{display:flex;flex-direction:column;justify-content:space-between;min-height:150px;padding:14px;border-radius:14px;text-decoration:none;background:var(--k,#fff);color:var(--ink);box-shadow:0 6px 0 rgba(0,0,0,.4);transition:transform .08s,box-shadow .08s}
.key:hover{transform:translateY(2px);box-shadow:0 4px 0 rgba(0,0,0,.4)}
.key:active{transform:translateY(6px);box-shadow:none}
.key i{font-style:normal;font-size:44px;font-weight:800;line-height:1}
.key b{font-size:17px;line-height:1.2}
.key small{opacity:.65;font-size:13px}
.g-math{--k:#fff}.g-money{--k:var(--lime)}.g-conv{--k:var(--peri)}.g-home{--k:var(--peach)}.g-health{--k:#8FE3C4}
.card,.calc{background:#fff;border:2px solid var(--ink);border-radius:18px;padding:20px;box-shadow:6px 6px 0 var(--ink);margin-top:18px}
.card label{display:block;font-weight:600;font-size:15px;margin-bottom:12px}
.card input,.card select{display:block;width:100%;font:inherit;font-size:18px;padding:10px 12px;margin-top:4px;border:1.5px solid var(--line);border-radius:10px;background:#fff}
.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:0 16px}
.out{margin-top:20px;background:var(--panel);color:#fff;border-radius:18px;padding:20px}
.big span{display:block;color:#B6C2D4;font-size:15px}
.big strong{font-size:clamp(30px,7vw,46px);color:var(--lime);letter-spacing:-.02em;word-break:break-word}
.out dl{margin:14px 0 0;display:grid;grid-template-columns:1fr auto;gap:6px 16px}
.out dt{color:#B6C2D4}.out dd{margin:0;font-weight:600;text-align:right}
.err{color:var(--peach);margin:0}.note{color:#B6C2D4;font-size:14px}
.calc{max-width:420px}
.hist{color:var(--mut);min-height:1.5em;text-align:right;overflow:hidden}
.calc>input{width:100%;font:inherit;font-size:34px;text-align:right;border:0;outline:0;font-weight:800}
.deg{font-size:14px;color:var(--mut)}
.pad{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.pad button{font:inherit;font-size:22px;font-weight:600;padding:14px 0;border-radius:12px;border:0;background:#E7ECF3;cursor:pointer;box-shadow:0 4px 0 #B9C3D2}
.pad button:active{transform:translateY(4px);box-shadow:none}
.pad .op{background:var(--peri)}.pad .eq{background:var(--lime);grid-column:span 4}
.pad.sci button{font-size:18px}
main ul{max-width:68ch;padding-left:1.2em}.more a{display:inline-block;margin:0 14px 6px 0}
footer{border-top:1px solid var(--line);margin-top:48px;padding-top:20px;padding-bottom:40px;color:var(--mut);font-size:15px}
footer a{margin-right:16px}
:focus-visible{outline:3px solid var(--peri);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}