/* Calculadora Alicia — cuaderno de cuadrícula */
:root{
  --paper:#FBFCFE; --white:#fff; --grid:#E4EBF6; --line:#D3DCEA;
  --ink:#182238; --muted:#566077;
  --blue:#2152A6; --blue-d:#173C7A; --blue-soft:#EAF0FB;
  --margin:#E0483E; --pencil:#F4C542; --pencil-soft:rgba(244,197,66,.55);
  --err:#B3261E;
  --r:6px;
  --head:"Bricolage Grotesque",system-ui,-apple-system,"Segoe UI",sans-serif;
  --body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.68 var(--body)}
img,svg{max-width:100%;height:auto}
a{color:var(--blue);text-underline-offset:.18em}
a:hover{color:var(--blue-d)}
:focus-visible{outline:3px solid var(--pencil);outline-offset:2px;border-radius:2px}
h1,h2,h3,h4{font-family:var(--head);line-height:1.15;letter-spacing:-.012em;color:var(--ink)}
h1{font-size:clamp(2rem,4.6vw,3.15rem);font-weight:800;margin:.15em 0 .35em}
h2{font-size:clamp(1.4rem,2.6vw,1.75rem);font-weight:700;margin:2.1em 0 .55em}
h3{font-size:1.2rem;font-weight:700;margin:1.6em 0 .4em}
p,ul,ol{margin:0 0 1.05em}
li{margin:.25em 0}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:9}

/* Cabecera */
.site-head{background:var(--white);border-bottom:1px solid var(--line);position:relative}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:800 1.28rem/1 var(--head);letter-spacing:-.02em}
.logo-mark{width:34px;height:34px;border-radius:7px;background:var(--blue);display:grid;place-items:center;color:#fff;font:800 1.3rem/1 var(--head);box-shadow:inset 0 -4px 0 var(--blue-d)}
.nav{display:flex;gap:4px;align-items:center}
.nav a{padding:8px 12px;border-radius:var(--r);text-decoration:none;color:var(--ink);font-weight:700;font-size:.98rem}
.nav a:hover,.nav a[aria-current=page]{background:var(--blue-soft);color:var(--blue-d)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:var(--r);padding:8px 12px;font:700 .95rem var(--body);color:var(--ink);cursor:pointer}
@media (max-width:760px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:68px;background:#fff;flex-direction:column;align-items:stretch;padding:8px 20px 16px;border-bottom:1px solid var(--line);z-index:5}
  .nav.open{display:flex}
}

/* Migas */
.crumbs{font-size:.92rem;color:var(--muted);margin:22px 0 0}
.crumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li:not(:last-child)::after{content:"/";margin-left:6px;color:#AEB9CC}
.crumbs a{color:var(--muted)}

/* Papel cuadriculado + margen rojo de cuaderno */
.grid-paper{background-color:var(--white);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:22px 22px;background-position:-1px -1px}
.cuaderno{position:relative;border:1px solid var(--line);border-radius:var(--r);padding:26px 22px 26px 58px}
.cuaderno::before{content:"";position:absolute;left:36px;top:0;bottom:0;width:2px;background:var(--margin);opacity:.75}
@media (max-width:520px){.cuaderno{padding:20px 14px 20px 34px}.cuaderno::before{left:20px}}

/* Formularios */
.calc label,.field-label{display:block;font-weight:700;margin:0 0 6px;font-size:.98rem}
.calc .hint{display:block;font-weight:400;color:var(--muted);font-size:.9rem;margin-top:2px}
.calc input,.calc select,.calc textarea,.form input,.form textarea{width:100%;font:400 1.08rem/1.4 var(--body);color:var(--ink);background:#fff;border:1.5px solid #B9C5D9;border-radius:var(--r);padding:11px 12px}
.calc textarea,.form textarea{min-height:110px;resize:vertical}
.calc input:focus,.calc select:focus,.calc textarea:focus,.form input:focus,.form textarea:focus{border-color:var(--blue);outline:3px solid var(--pencil-soft);outline-offset:0}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:16px;align-items:end}
.row.tight{grid-template-columns:repeat(auto-fit,minmax(110px,1fr))}
.op{display:flex;align-items:flex-end;justify-content:center;font:800 1.8rem/1 var(--head);color:var(--blue);padding-bottom:10px}
@media (max-width:520px){.op{display:none}}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.btn{appearance:none;border:0;border-radius:var(--r);padding:12px 22px;font:700 1.02rem/1 var(--body);cursor:pointer;background:var(--blue);color:#fff;box-shadow:inset 0 -3px 0 var(--blue-d);text-decoration:none;display:inline-block}
.btn:hover{background:var(--blue-d);color:#fff}
.btn.ghost{background:#fff;color:var(--ink);border:1.5px solid #B9C5D9;box-shadow:none}
.btn.ghost:hover{border-color:var(--ink);color:var(--ink)}
details summary{cursor:pointer}

/* Resultados: subrayado con rotulador */
.out{margin-top:22px;padding-top:18px;border-top:2px dashed var(--line)}
.res-label{margin:0 0 4px;color:var(--muted);font-weight:700;font-size:.95rem}
.res{margin:0 0 14px;font:800 clamp(1.7rem,4vw,2.4rem)/1.2 var(--head);font-variant-numeric:tabular-nums;word-break:break-word}
.res mark{background:linear-gradient(transparent 55%,var(--pencil-soft) 55%);color:var(--ink);padding:0 .1em}
.res-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:4px 20px}
.res-grid .res{font-size:1.5rem}
.steps{margin:6px 0 0;padding-left:1.3em}
.steps li{margin:.35em 0}
.steps-title{font:700 1.05rem var(--head);margin:14px 0 4px}
.err{color:var(--err);font-weight:700;margin:0}
.colcalc{font:600 1.3rem/1.35 ui-monospace,"SF Mono",Menlo,Consolas,monospace;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:10px 16px;display:inline-block;white-space:pre;margin:4px 0 14px;overflow-x:auto;max-width:100%}
.tbl-wrap{overflow-x:auto;margin:8px 0 12px}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums;background:#fff}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}
th{background:var(--blue-soft);font-family:var(--head)}
.hours td input{padding:7px 8px;font-size:1rem;min-width:96px}

/* Teclado (básica y científica) */
.keypad-calc .screen{background:#fff;border:1.5px solid #B9C5D9;border-radius:var(--r);padding:10px 12px;margin-bottom:12px}
.keypad-calc .screen input{width:100%;border:0;padding:4px 0;font:600 1.35rem/1.3 var(--body);color:var(--ink);outline:none;background:transparent}
.keypad-calc .screen-res{font:800 1.9rem/1.2 var(--head);text-align:right;min-height:1.3em;font-variant-numeric:tabular-nums;word-break:break-all}
.keypad-calc .screen-res mark{background:linear-gradient(transparent 55%,var(--pencil-soft) 55%);color:var(--ink)}
.keypad-calc .screen-res .err{font:700 1rem var(--body)}
.keys{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.keys button{min-height:48px;border:1.5px solid #C4CFE0;border-radius:var(--r);background:#fff;font:700 1.08rem var(--body);color:var(--ink);cursor:pointer;padding:0}
.keys button:hover{border-color:var(--blue)}
.keys button.fn{background:var(--blue-soft);color:var(--blue-d);font-size:.98rem}
.keys button.eq{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:inset 0 -3px 0 var(--blue-d)}
.keys button.clear{color:var(--margin)}
.keys button.wide{grid-column:span 3}
.modebar{display:flex;gap:6px;margin-bottom:10px;align-items:center;flex-wrap:wrap}
.modebar button{border:1.5px solid #C4CFE0;background:#fff;border-radius:var(--r);padding:6px 12px;font:700 .92rem var(--body);cursor:pointer;color:var(--ink)}
.modebar button[aria-pressed=true]{background:var(--ink);color:#fff;border-color:var(--ink)}
.modebar .clear{color:var(--margin)}
.history{font-size:.95rem;color:var(--muted);margin:12px 0 0;padding-left:1.1em}

/* Página: contenido + lateral */
.page{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:48px;margin:10px 0 64px}
@media (max-width:960px){.page{grid-template-columns:minmax(0,1fr);gap:28px}}
.page>*{min-width:0}
.prose{max-width:72ch}
.prose .note{border-left:4px solid var(--pencil);background:#FFFBEA;padding:12px 16px;border-radius:0 var(--r) var(--r) 0}
.prose table{margin:8px 0 18px}
.lede{font-size:1.18rem;color:var(--muted);max-width:62ch;margin-bottom:22px}
.aside-box{border:1px solid var(--line);background:#fff;border-radius:var(--r);padding:18px 20px;position:sticky;top:18px}
.aside-box h2{font-size:1.1rem;margin:0 0 10px}
.aside-box ul{list-style:none;padding:0;margin:0}
.aside-box li{margin:0;border-top:1px solid var(--grid)}
.aside-box li:first-child{border-top:0}
.aside-box a{display:block;padding:8px 0;text-decoration:none;font-weight:700}
.aside-box a:hover{text-decoration:underline}
@media (max-width:960px){.aside-box{position:static}}

/* Preguntas frecuentes */
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{font:700 1.08rem/1.4 var(--head);padding:12px 0}
.faq details p{margin:0 0 14px}

/* Inicio */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:52px 0 56px}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.9rem);line-height:1.02;letter-spacing:-.028em}
.hero .lede{font-size:1.22rem}
@media (max-width:900px){.hero{grid-template-columns:1fr;gap:28px;padding:32px 0 40px}}
.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.section-head h2{margin-top:1.2em}
.calc-list{list-style:none;padding:0;margin:0 0 20px;display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));column-gap:40px}
.calc-list li{margin:0;border-top:1px solid var(--line)}
.calc-list a{display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:start;padding:16px 0;text-decoration:none;color:var(--ink)}
.calc-list .sym{width:44px;height:44px;border-radius:var(--r);border:1.5px solid var(--line);display:grid;place-items:center;font:800 1.15rem/1 var(--head);color:var(--blue);background:#fff}
.calc-list strong{display:block;font:700 1.1rem/1.3 var(--head);color:var(--blue-d)}
.calc-list span{color:var(--muted);font-size:.97rem;line-height:1.45}
.calc-list a:hover strong{text-decoration:underline}
.band{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:8px 0 40px;margin-top:30px}
.post-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:0 40px}
.post-list li{margin:0;border-top:1px solid var(--line);padding:16px 0}
.post-list a{font:700 1.12rem/1.3 var(--head);text-decoration:none}
.post-list a:hover{text-decoration:underline}
.post-list p{margin:6px 0 0;color:var(--muted);font-size:.97rem;line-height:1.5}
.post-list time{display:block;font-size:.88rem;color:var(--muted);margin-top:6px}
.principles{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px;margin:10px 0 30px}
.principles h3{margin-top:.6em}
.principles p{color:var(--muted)}

/* Artículo */
.post-meta{color:var(--muted);font-size:.95rem;margin:-4px 0 22px}
.cta-calc{border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;margin:28px 0}
.cta-calc p{margin:0 0 12px}

/* Pie */
.site-foot{background:var(--ink);color:#C9D2E3;padding:44px 0 26px;margin-top:40px;font-size:.96rem}
.site-foot a{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:28px}
@media (max-width:860px){.foot-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.foot-grid{grid-template-columns:1fr}}
.site-foot h2{color:#fff;font-size:1.02rem;margin:0 0 10px}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin:0 0 6px}
.site-foot .logo{color:#fff;margin-bottom:12px}
.foot-bottom{border-top:1px solid #2E3A55;margin-top:30px;padding-top:18px;font-size:.9rem}
.prose > table{display:block;overflow-x:auto;width:max-content;max-width:100%}