:root{
  --bg:#f6f7fb; --surface:#fff; --text:#1c2333; --muted:#5b6478; --border:#e2e6ef; --border-strong:#c9d0de;
  --accent:#2f6fed; --accent-hover:#2560d6; --accent-soft:#e8f0fe; --ok:#1f8a4c; --radius:14px;
  --shadow:0 1px 2px rgba(16,24,40,.04),0 6px 18px rgba(16,24,40,.06);
  /* Curvas propias: las de CSS por defecto se quedan cortas */
  --ease-out:cubic-bezier(.23,1,.32,1); --ease-in-out:cubic-bezier(.77,0,.175,1);
}
@media (prefers-color-scheme: dark){
  :root{--bg:#10141c; --surface:#171d28; --text:#e7ebf3; --muted:#9aa4b8; --border:#283244; --border-strong:#3a4660; --accent:#6d9cff; --accent-hover:#86adff; --accent-soft:#1e2a44; --ok:#4cc483; --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
::selection{background:var(--accent-soft);color:var(--text)}
a{color:var(--accent);text-underline-offset:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
.wrap{max-width:980px;margin:0 auto;padding:0 16px}
header.top{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--surface) 88%,transparent);-webkit-backdrop-filter:saturate(1.6) blur(10px);backdrop-filter:saturate(1.6) blur(10px);border-bottom:1px solid var(--border)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px;flex-wrap:wrap}
.logo{font-weight:800;font-size:1.25rem;letter-spacing:-.02em;text-decoration:none;color:var(--text)}
.logo span{color:var(--accent)}
nav.main a{margin-left:16px;text-decoration:none;color:var(--muted);font-size:.95rem;transition:color 150ms ease}
.breadcrumb{font-size:.85rem;color:var(--muted);margin:18px 0 0}
.breadcrumb a{color:var(--muted);text-decoration:none}
h1{font-size:clamp(1.6rem,4vw,2.2rem);line-height:1.2;letter-spacing:-.02em;margin:14px 0 8px;text-wrap:balance}
h2{font-size:1.3rem;letter-spacing:-.01em;margin:32px 0 10px;text-wrap:balance}
h3{font-size:1.05rem;margin:20px 0 6px}
p{text-wrap:pretty}
.lead{color:var(--muted);font-size:1.05rem;margin:0 0 20px;max-width:65ch}
.hero{padding:36px 0 10px}
#herramientas{scroll-margin-top:76px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin:20px 0}
.card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--text);transition:border-color 200ms ease,box-shadow 200ms ease,transform 200ms var(--ease-out);-webkit-tap-highlight-color:transparent}
.card:active{transform:scale(.98)}
.card .ico{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--accent-soft);font-size:1.35rem;line-height:1}
.card strong{display:block;margin:10px 0 4px}
.card p{margin:0;color:var(--muted);font-size:.92rem}
.tool{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:10px 0 24px;box-shadow:var(--shadow)}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin-bottom:14px}
label{display:block;font-size:.88rem;font-weight:600;margin-bottom:5px}
input,select{width:100%;padding:11px 12px;font-size:1rem;font-family:inherit;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text);transition:border-color 150ms ease,box-shadow 150ms ease}
input:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 22%,transparent)}
input[type=checkbox],input[type=range]{accent-color:var(--accent)}
input[type=checkbox]{width:18px;height:18px;margin:0 8px 0 0;flex:none;cursor:pointer}
input[type=checkbox]:focus{box-shadow:none}
input[type=range]{padding:0;border:0;background:none;cursor:pointer}
input[type=range]:focus{box-shadow:none}
.check{display:flex;align-items:center;font-weight:500;font-size:.95rem;cursor:pointer;margin:0}
button,.btn{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:10px;padding:11px 18px;font-size:1rem;font-family:inherit;font-weight:600;cursor:pointer;text-decoration:none;transition:background-color 150ms ease,color 150ms ease,border-color 150ms ease,transform 160ms var(--ease-out);-webkit-tap-highlight-color:transparent;touch-action:manipulation}
/* Respuesta inmediata al pulsar */
button:active,.btn:active{transform:scale(.97)}
button.secondary{background:var(--accent-soft);color:var(--accent)}
.result{background:var(--accent-soft);border-radius:12px;padding:16px;margin-top:14px;min-height:56px}
/* Cifras de ancho fijo: el resultado no "baila" mientras se escribe */
.result .big{font-size:1.7rem;font-weight:800;letter-spacing:-.02em;color:var(--accent);word-break:break-word;font-variant-numeric:tabular-nums}
.result small{color:var(--muted)}
.result .big.pw{letter-spacing:.5px}
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.tabs button{background:var(--bg);color:var(--text);border:1px solid var(--border);padding:8px 14px;font-size:.92rem}
.tabs button.active{background:var(--accent);color:#fff;border-color:var(--accent)}
table{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:12px;font-variant-numeric:tabular-nums}
th,td{padding:8px;border-bottom:1px solid var(--border);text-align:right}
th{position:sticky;top:0;background:var(--surface);font-weight:600}
th:first-child,td:first-child{text-align:left}
.table-scroll{overflow-x:auto;max-height:420px;border-radius:10px}
.content{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:4px 20px 18px;margin-bottom:24px}
.content p,.content li{color:var(--text)}
.formula{background:var(--bg);border-left:4px solid var(--accent);padding:10px 14px;border-radius:8px;font-family:ui-monospace,Menlo,monospace;font-size:.95rem;overflow-x:auto}
details{border-bottom:1px solid var(--border);padding:10px 0}
summary{cursor:pointer;font-weight:600;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px;transition:color 150ms ease}
summary::-webkit-details-marker{display:none}
summary::after{content:"";flex:none;width:8px;height:8px;margin-right:4px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:translateY(-2px) rotate(45deg);transition:transform 200ms var(--ease-out)}
details[open] summary::after{transform:translateY(2px) rotate(-135deg)}
details[open] > :not(summary){animation:reveal 200ms var(--ease-out)}
@keyframes reveal{from{opacity:0;transform:translateY(-4px)}}
.related{margin-bottom:30px}
.ad-slot{margin:22px auto;text-align:center;min-height:0}
.ad-slot.on{min-height:100px;margin:32px auto}
footer.bottom{border-top:1px solid var(--border);background:var(--surface);padding:24px 0;margin-top:40px;font-size:.9rem;color:var(--muted)}
footer.bottom a{color:var(--muted);margin-right:14px;text-decoration:none;transition:color 150ms ease}
/* Aviso de cookies: entra con ease-out y sale más rápido de lo que entra */
.cookie{position:fixed;left:12px;right:12px;bottom:12px;max-width:720px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;box-shadow:0 8px 30px rgba(0,0,0,.18);display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:.9rem;z-index:50;transition:opacity 300ms var(--ease-out),transform 300ms var(--ease-out)}
@starting-style{.cookie{opacity:0;transform:translateY(16px)}}
.cookie.out{opacity:0;transform:translateY(16px);transition-duration:180ms}
.cookie p{margin:0;flex:1 1 260px}
.pw{font-family:ui-monospace,Menlo,monospace;letter-spacing:.5px}
.muted{color:var(--muted)}
/* Entrada escalonada de las herramientas en la portada (solo al cargar) */
#herramientas + .grid .card{animation:rise 360ms var(--ease-out) both}
#herramientas + .grid .card:nth-child(2){animation-delay:30ms}
#herramientas + .grid .card:nth-child(3){animation-delay:60ms}
#herramientas + .grid .card:nth-child(4){animation-delay:90ms}
#herramientas + .grid .card:nth-child(5){animation-delay:120ms}
#herramientas + .grid .card:nth-child(6){animation-delay:150ms}
#herramientas + .grid .card:nth-child(n+7){animation-delay:180ms}
@keyframes rise{from{opacity:0;transform:translateY(8px)}}
/* Hover solo con ratón: en pantallas táctiles el hover se queda "pegado" */
@media (hover:hover) and (pointer:fine){
  nav.main a:hover,footer.bottom a:hover,.breadcrumb a:hover{color:var(--accent)}
  .card:hover{border-color:var(--accent);box-shadow:var(--shadow);transform:translateY(-2px)}
  .card:hover:active{transform:translateY(-2px) scale(.98)}
  button:hover,.btn:hover{background:var(--accent-hover)}
  button.secondary:hover{background:color-mix(in srgb,var(--accent) 18%,var(--surface))}
  .tabs button:not(.active):hover{border-color:var(--border-strong);background:var(--surface)}
  .tabs button.active:hover{background:var(--accent-hover)}
  input:not([type=checkbox]):not([type=range]):hover,select:hover{border-color:var(--border-strong)}
  input:focus:hover,select:focus:hover{border-color:var(--accent)}
  summary:hover{color:var(--accent)}
}
/* Movimiento reducido: se mantienen los fundidos y se quita el desplazamiento */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-property:opacity,color,background-color,border-color,box-shadow !important}
  #herramientas + .grid .card,details[open] > :not(summary){animation:fade 200ms ease both}
  @keyframes fade{from{opacity:0}}
  .card:hover,.card:active,button:active,.btn:active{transform:none}
  @starting-style{.cookie{transform:none}}
  .cookie.out{transform:none}
}
@media (max-width:560px){nav.main a{margin:0 12px 0 0}header.top .wrap{padding:10px 16px}}