/* Calculadoras universales — tinta #1B1F3B · fondo #EEF2F7 · blanco · marcador #FFD23F · enlace #0F7C7E */
:root{--ink:#1B1F3B;--ink2:#4B5070;--bg:#EEF2F7;--paper:#fff;--mark:#FFD23F;--link:#0F7C7E;--line:#D6DCE6;--r:14px;
--fh:"Sora",system-ui,sans-serif;--fb:"Atkinson Hyperlegible",system-ui,sans-serif}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--fb);font-size:18px;line-height:1.6;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--link);text-underline-offset:3px}
:focus-visible{outline:3px solid var(--link);outline-offset:2px;border-radius:4px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:#fff;padding:8px;z-index:30}
h1,h2,h3,.brand,.big{font-family:var(--fh);line-height:1.12;letter-spacing:-.01em}
.num,.big,input{font-variant-numeric:tabular-nums}

/* Cabecera */
.top{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top .wrap{display:flex;align-items:center;gap:12px;height:62px}
.brand{font-weight:700;font-size:1.2rem;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:8px;margin-right:auto}
.brand b{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--ink);color:var(--mark);font-size:1rem}
.cur{font:600 .9rem var(--fb);border:1.5px solid var(--line);border-radius:8px;padding:7px 8px;background:#fff;color:var(--ink)}
.menu-btn{font:600 .95rem var(--fb);background:none;border:1.5px solid var(--line);border-radius:8px;padding:7px 12px;color:var(--ink);cursor:pointer}
.nav{display:none;background:var(--paper);border-bottom:1px solid var(--line);padding:6px 20px 16px}
.nav.open{display:block}
.nav h3{font-size:.95rem;margin:12px 0 4px;color:var(--ink2)}
.nav a{display:inline-block;margin:0 14px 6px 0;font-weight:600;text-decoration:none}

/* Portada: calculadora frase */
.hero{padding:44px 0 36px}
.hero p.sub{color:var(--ink2);margin-bottom:22px;max-width:52ch}
.sentence{font-family:var(--fh);font-weight:600;font-size:clamp(1.7rem,6.4vw,3rem);line-height:1.35;max-width:22ch}
.sentence input{font:inherit;width:3.4ch;border:0;border-bottom:3px solid var(--ink);background:transparent;color:var(--ink);text-align:center;padding:0 2px;-moz-appearance:textfield}
.sentence input::-webkit-outer-spin-button,.sentence input::-webkit-inner-spin-button{-webkit-appearance:none}
.sentence input.w{width:5ch}
.sentence .ans{background:linear-gradient(transparent 55%,var(--mark) 55%);padding:0 4px}
.hero .more{margin-top:18px;font-size:1rem}
.find{margin:8px 0 26px}
.find input{width:100%;font:500 1.05rem var(--fb);padding:14px 16px;border:1.5px solid var(--line);border-radius:12px;background:#fff}
.cats{display:grid;gap:30px;padding-bottom:20px}
@media(min-width:780px){.cats{grid-template-columns:repeat(2,1fr)}}
.cat h2{font-size:1.25rem;margin-bottom:6px}
.cat ul{list-style:none}
.cat li{border-top:1px solid var(--line)}
.cat li a{display:flex;gap:12px;align-items:baseline;padding:12px 0;text-decoration:none;color:var(--ink)}
.cat li a b{font-weight:700}
.cat li a span{color:var(--ink2);font-size:.92rem}
.cat li a:hover b{color:var(--link)}

/* Páginas de calculadora */
.crumbs{font-size:.88rem;color:var(--ink2);padding:18px 0 0}
.crumbs a{color:var(--ink2)}
.head{padding:10px 0 18px;max-width:760px}
.head h1{font-size:clamp(1.8rem,5.4vw,2.6rem);font-weight:700}
.lead{font-size:1.1rem;margin-top:10px}
.tool{display:grid;gap:18px;margin-bottom:34px}
@media(min-width:880px){.tool{grid-template-columns:1fr 380px;align-items:start}.out{position:sticky;top:80px}}
.form{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.f{margin-bottom:16px}.f:last-child{margin-bottom:0}
.f label,.f .l{display:block;font-weight:700;margin-bottom:6px;font-size:.98rem}
.f input,.f select{width:100%;font:500 1.08rem var(--fb);border:1.5px solid var(--line);border-radius:10px;padding:11px 12px;min-height:48px;background:#fff;color:var(--ink)}
.f input:focus,.f select:focus{outline:none;border-color:var(--link);box-shadow:0 0 0 3px #CFEAEA}
.hint{font-size:.86rem;color:var(--ink2);margin-top:4px}
.r2{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:end}
.seg{display:flex;border:1.5px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{flex:1;border:0;background:#fff;font:700 .92rem var(--fb);color:var(--ink2);padding:11px 6px;cursor:pointer;min-height:46px}
.seg button+button{border-left:1.5px solid var(--line)}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}
.out{background:var(--paper);border:2px solid var(--ink);border-radius:var(--r);padding:20px}
.out .label{font-size:.92rem;color:var(--ink2)}
.big{font-size:clamp(2rem,7vw,2.6rem);font-weight:700;margin:4px 0 12px;display:inline-block;background:linear-gradient(transparent 58%,var(--mark) 58%);padding:0 4px}
.out dl div{display:flex;justify-content:space-between;gap:14px;padding:8px 0;border-top:1px solid var(--line);font-size:.98rem}
.out dt{color:var(--ink2)}.out dd{font-weight:700;text-align:right}
.out .say{font-size:.95rem;margin-top:10px;color:var(--ink2)}
.content{max-width:720px;padding-bottom:10px}
.content h2{font-size:1.45rem;margin:30px 0 8px}
.content p{margin-bottom:12px}
.content ul,.content ol{margin:0 0 14px 22px}
.tabla{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fff;margin:6px 0 16px}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{text-align:left;padding:9px 11px;border-bottom:1px solid var(--line)}
th{font-family:var(--fh);font-size:.88rem;background:#F6F8FB}
tr:last-child td{border-bottom:0}
details{border-top:1px solid var(--line)}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-weight:700;padding:12px 0}
details p{padding-bottom:12px;margin:0}
.rel ul{list-style:none;margin:0}
.rel li{border-top:1px solid var(--line)}
.rel a{display:block;padding:11px 0;font-weight:700;text-decoration:none}
.foot{background:var(--ink);color:#C9CDE3;margin-top:50px;padding:34px 0;font-size:.92rem}
.foot a{color:#fff;margin-right:16px;display:inline-block;padding:4px 0;text-decoration:none}
.foot p{margin-top:10px}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.r2 .f,.r2 .f:last-child{margin-bottom:16px}
.form>.r2:last-child .f{margin-bottom:0}
.cat li a{flex-direction:column;gap:1px}