:root{
  --bg:#ECEFF3; --surface:#FFFFFF; --ink:#142233; --muted:#5A6778; --line:#D5DBE3; --soft:#F5F7FA;
  --green:#0B6E4F; --green-soft:#E3F2EC; --stamp:#B4232C; --focus:#2F6FEB;
  --paper:#FFFFFF; --paper-ink:#142233;
  --sans:"IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0E151F; --surface:#151F2C; --ink:#E6ECF3; --muted:#9AA8B8; --line:#263446; --soft:#1B2735;
        --green:#3FC79A; --green-soft:#12342A; --stamp:#F0626B; --focus:#7AA7FF; --paper:#F7F8FA; --paper-ink:#142233}
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:12px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.55 var(--sans)}
[hidden]{display:none !important}
a{color:inherit}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.wrap{width:min(100% - 32px, 1080px);margin-inline:auto}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;border-radius:8px;z-index:10}
.skip:focus{left:8px}

/* Header */
.top{border-bottom:1px solid var(--line);background:var(--surface);padding-top:env(safe-area-inset-top)}
.top-in{display:flex;align-items:center;gap:20px;min-height:58px;flex-wrap:wrap}
.brand{font-weight:700;text-decoration:none;margin-right:auto}
.switch{display:flex;gap:4px;padding:4px;background:var(--soft);border-radius:10px}
.switch a{padding:6px 12px;border-radius:7px;text-decoration:none;font-weight:600;font-size:.93rem;color:var(--muted)}
.switch a[aria-current="page"]{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px rgba(0,0,0,.12)}

.hero{padding:34px 0 22px}
.hero h1{font-size:clamp(2rem,5vw,3rem);line-height:1.05;letter-spacing:-.03em;margin:0 0 10px;font-weight:700}
.hero p{margin:0;color:var(--muted);max-width:60ch;font-size:1.05rem}

/* Layout */
.grid{display:grid;grid-template-columns:minmax(0,1fr);gap:22px;align-items:start;padding-bottom:40px}
@media (min-width:900px){.grid{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr)}.boleta-col{position:sticky;top:16px}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px}
@media (min-width:600px){.card{padding:28px}}
fieldset{border:0;margin:0 0 22px;padding:0;min-width:0}
legend,.lbl{display:block;font-weight:600;margin-bottom:8px;padding:0}
.hint{font-size:.88rem;color:var(--muted);margin:6px 0 0}

/* Period selector */
.periods{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.periods label{position:relative;display:block;border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;background:var(--soft)}
.periods input{position:absolute;opacity:0;pointer-events:none}
.periods b{display:block;font-size:.98rem}
.periods small{display:block;color:var(--muted);font-size:.8rem}
.periods label:has(input:checked){border-color:var(--ink);background:var(--surface);box-shadow:inset 0 0 0 1px var(--ink)}
.periods label:has(input:focus-visible){outline:3px solid var(--focus);outline-offset:2px}
@media (max-width:420px){.periods label{padding:9px 8px}.periods b{font-size:.9rem;line-height:1.2}}

/* Money input */
.money{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:12px;background:var(--soft);padding-left:14px;transition:border-color .15s}
.money:focus-within{border-color:var(--ink);box-shadow:0 0 0 3px color-mix(in srgb,var(--focus) 30%,transparent)}
.money span{font-weight:600;color:var(--muted)}
.money input{flex:1;min-width:0;border:0;background:transparent;padding:12px 14px 12px 8px;font-size:1.5rem;font-weight:600;font-family:var(--mono);outline:none}
input[type=date],input[type=number],.field input,select{width:100%;min-width:0;min-height:46px;padding:9px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--soft)}
input[type=date]:focus,.field input:focus,select:focus{border-color:var(--ink);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--focus) 30%,transparent)}

/* Toggle */
.toggle{display:flex;align-items:flex-start;gap:12px;cursor:pointer}
.toggle input{appearance:none;flex:none;width:46px;height:28px;border-radius:99px;background:var(--line);position:relative;cursor:pointer;margin:0;transition:background .2s}
.toggle input::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.3);transition:transform .2s}
.toggle input:checked{background:var(--green)}
.toggle input:checked::after{transform:translateX(18px)}
.toggle b{display:block;font-weight:600}
.toggle small{display:block;color:var(--muted);font-size:.88rem}

/* Chips */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips label{cursor:pointer}
.chips input{position:absolute;opacity:0;pointer-events:none}
.chips span{display:inline-block;padding:8px 14px;border:1.5px solid var(--line);border-radius:99px;font-weight:600;font-size:.93rem;background:var(--soft)}
.chips input:checked+span{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.chips input:focus-visible+span{outline:3px solid var(--focus);outline-offset:2px}

details.more{border-top:1px solid var(--line);padding-top:6px}
details.more>summary{cursor:pointer;list-style:none;min-height:48px;display:flex;align-items:center;justify-content:space-between;font-weight:600}
details.more>summary::-webkit-details-marker{display:none}
details.more>summary::after{content:"+";font-size:1.3rem;color:var(--muted)}
details.more[open]>summary::after{content:"–"}
.two{display:grid;gap:14px}
@media (min-width:560px){.two{grid-template-columns:1fr 1fr}}
.field{display:grid;gap:6px;min-width:0}
.field>span{font-size:.92rem;font-weight:600}
.sub{margin:18px 0 8px;font-size:.95rem;font-weight:700}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.err{color:var(--stamp);font-weight:600;font-size:.92rem;margin:8px 0 0}
.err:empty{display:none}

/* Boleta: the memorable element */
.boleta{position:relative;background:var(--paper);color:var(--paper-ink);border-radius:14px 14px 0 0;padding:24px 22px 30px;
  box-shadow:0 1px 0 var(--line),0 24px 40px -28px rgba(10,20,35,.55);
  -webkit-mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) 50% / 16px 100%;
          mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) 50% / 16px 100%}
.b-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;border-bottom:2px solid var(--paper-ink);padding-bottom:12px;margin-bottom:12px}
.b-head h2{margin:0;font-size:1.05rem;letter-spacing:.01em}
.b-head p{margin:2px 0 0;font-size:.85rem;color:#5A6778}
.lines{list-style:none;margin:0;padding:0;font-family:var(--mono);font-size:.9rem}
.lines li{display:flex;align-items:baseline;gap:8px;padding:5px 0}
.lines li .k{flex:none;max-width:62%}
.lines li .k small{display:block;font-size:.76rem;color:#6B7888;font-family:var(--sans)}
.lines li .dots{flex:1;border-bottom:1.5px dotted #B7C0CC;transform:translateY(-4px);min-width:12px}
.lines li .v{flex:none;font-weight:600;white-space:nowrap}
.lines li.minus .v{color:#B4232C}
.lines li.sep{border-top:1px dashed #C6CDD6;margin-top:6px;padding-top:9px}
.total{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-top:14px;padding-top:14px;border-top:2px solid var(--paper-ink)}
.total span{font-weight:700;font-size:.95rem}
.total output{font-family:var(--mono);font-weight:600;font-size:clamp(1.9rem,6vw,2.5rem);letter-spacing:-.02em;color:#0B6E4F;line-height:1}
.stamp{flex:none;transform:rotate(-7deg);border:2.5px solid #B4232C;color:#B4232C;border-radius:8px;padding:5px 10px;text-align:center;
  font-weight:700;font-size:.72rem;line-height:1.25;letter-spacing:.02em;opacity:.88;background:rgba(255,255,255,.7);pointer-events:none}
.stamp b{display:block;font-size:1rem}
.b-empty{font-family:var(--sans);color:#5A6778;padding:18px 0 6px;font-size:.95rem}
.how{margin:14px 0 0;padding:10px 12px;border-radius:10px;background:#F2F5F8;font-size:.86rem;color:#3E4A5A}
.how b{color:#142233}
.notes{margin:16px 0 0;display:grid;gap:8px}
.note{font-size:.9rem;padding:10px 12px;border-radius:10px;background:var(--surface);border:1px solid var(--line)}
.note.good{background:var(--green-soft);border-color:transparent}
.note.warn{border-color:var(--stamp)}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 16px;border-radius:10px;border:1.5px solid var(--line);background:var(--surface);font-weight:600;cursor:pointer;text-decoration:none;font-size:.93rem}
.btn:hover{border-color:var(--ink)}
.btn-wa{background:#25D366;border-color:#25D366;color:#07351C}
.cross{display:block;margin-top:14px;padding:16px 18px;border-radius:14px;background:var(--ink);color:var(--surface);text-decoration:none}
.cross b{display:block;font-size:1.02rem}
.cross span{font-size:.9rem;opacity:.85}

/* Mobile total bar */
.bar{position:fixed;left:0;right:0;bottom:0;z-index:20;background:var(--ink);color:var(--surface);padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  display:flex;align-items:center;justify-content:space-between;gap:12px;transform:translateY(110%);transition:transform .25s}
.bar.show{transform:none}
.bar span{font-size:.85rem;opacity:.85}
.bar output{display:block;font-family:var(--mono);font-weight:600;font-size:1.25rem}
.bar button{border:0;border-radius:10px;padding:10px 14px;background:var(--surface);color:var(--ink);font-weight:700;cursor:pointer}
@media (min-width:900px){.bar{display:none}}

/* Content */
.info{padding:10px 0 30px}
.info h2{font-size:clamp(1.4rem,3.5vw,1.8rem);letter-spacing:-.02em;margin:34px 0 12px}
.info p,.info li{max-width:72ch}
.info .formula{font-family:var(--mono);background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;overflow-x:auto;font-size:.92rem}
.tbl{overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:12px}
.tbl table{border-collapse:collapse;width:100%;font-size:.94rem}
.tbl th,.tbl td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl tr:last-child td{border-bottom:0}
.tbl th{background:var(--soft);font-weight:600}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 16px;margin-bottom:8px}
.faq summary{cursor:pointer;min-height:52px;display:flex;align-items:center;font-weight:600}
.faq details p{margin:0 0 14px;color:var(--muted)}
.legal{font-size:.86rem;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:26px 0 calc(90px + env(safe-area-inset-bottom));color:var(--muted);font-size:.88rem}
@media (min-width:900px){footer{padding-bottom:30px}}
footer p{margin:0 0 6px}
.toast{position:fixed;left:50%;bottom:calc(84px + env(safe-area-inset-bottom));transform:translate(-50%,16px);background:var(--ink);color:var(--surface);padding:10px 18px;border-radius:99px;font-weight:600;opacity:0;pointer-events:none;transition:.2s;z-index:30}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media print{
  body{background:#fff}
  .top,.hero,.card.form,.info,footer,.bar,.actions,.cross,.toast,.notes{display:none !important}
  .grid{display:block}
  .boleta{box-shadow:none;border:1px solid #999;-webkit-mask:none;mask:none;max-width:520px;margin:0 auto}
}
@media (prefers-reduced-motion: reduce){*,*::before,*::after{transition:none !important}}
/* misbeneficios: navegación entre calculadoras */
.switch{overflow-x:auto;scrollbar-width:none;max-width:100%}
.switch::-webkit-scrollbar{display:none}
.switch a{white-space:nowrap}
.top-in{gap:12px}
@media (max-width:700px){.top-in{flex-wrap:wrap}.switch{width:100%}}
.cards-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));margin-top:8px}
.tool{display:block;padding:18px;border-radius:14px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--ink)}
.tool:hover{border-color:var(--ink)}
.tool b{display:block;font-size:1.08rem;margin-bottom:4px}
.tool span{color:var(--muted);font-size:.93rem}
.dates{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));margin-top:8px}
.date{padding:14px 16px;border-radius:12px;background:var(--surface);border:1px solid var(--line)}
.date b{display:block;font-family:var(--mono);font-size:1.6rem}
.date span{color:var(--muted);font-size:.9rem}
.date a{font-size:.88rem}