:root{
  --ink:#1C2B39; --ink-soft:#4F6070; --bg:#E6ECF0; --paper:#FFFFFF;
  --ledger:#2F6F5E; --ledger-soft:#DDEBE5; --minus:#B23A2E; --line:#C9D3DA;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#E4EBF0; --ink-soft:#9AAAB8; --bg:#121B23; --paper:#1A2631;
    --ledger:#6BC0A6; --ledger-soft:#1F3A33; --minus:#F07A6E; --line:#2E3D4A;
  }
}
:root[data-theme="dark"]{
  --ink:#E4EBF0; --ink-soft:#9AAAB8; --bg:#121B23; --paper:#1A2631;
  --ledger:#6BC0A6; --ledger-soft:#1F3A33; --minus:#F07A6E; --line:#2E3D4A;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:17px;line-height:1.55}
a{color:var(--ledger)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--ledger);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 1.25rem}
.disp{font-family:"Bricolage Grotesque","IBM Plex Sans",system-ui,sans-serif}

/* Cabecera */
.top{background:var(--paper);border-bottom:1px solid var(--line)}
.topin{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-top:.85rem;padding-bottom:.85rem}
.logo{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-weight:800;font-size:1.3rem;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.top nav{display:flex;gap:1.25rem;flex-wrap:wrap}
.top nav a{color:var(--ink);text-decoration:none;font-weight:500}
.top nav a:hover{color:var(--ledger)}

main{padding:2.5rem 0 4rem}
.crumbs{font-size:.88rem;color:var(--ink-soft);margin-bottom:1rem}
.crumbs a{color:var(--ink-soft)}
h1{font-family:"Bricolage Grotesque","IBM Plex Sans",system-ui,sans-serif;font-weight:800;
  font-size:clamp(2.1rem,6vw,3.5rem);line-height:1.03;letter-spacing:-.025em;margin:0 0 .75rem;max-width:18ch}
.lead{margin:0;color:var(--ink-soft);max-width:60ch;font-size:1.08rem}

/* Herramienta */
.tool{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-top:2.25rem;align-items:start}
@media (max-width:760px){.tool{grid-template-columns:1fr}}
.tool>*{min-width:0}
.amount input{width:100%}
@media (max-width:520px){.top nav{gap:.9rem;font-size:.95rem}}
.controls{display:flex;flex-direction:column;gap:1.4rem}
fieldset{border:0;margin:0;padding:0}
legend,.lbl{font-weight:600;margin-bottom:.45rem;display:block;font-size:.95rem}
.amount{display:flex;align-items:center;background:var(--paper);border:2px solid var(--line);border-radius:10px;padding:0 1rem}
.amount:focus-within{border-color:var(--ledger)}
.amount input{flex:1;border:0;background:transparent;color:var(--ink);
  font:700 1.7rem/1 "Bricolage Grotesque",system-ui,sans-serif;padding:.7rem 0;min-width:0;font-variant-numeric:tabular-nums}
.amount input:focus{outline:none}
.amount span{font-size:1.25rem;color:var(--ink-soft);padding-left:.5rem}
.field input[type=date]{width:100%;background:var(--paper);color:var(--ink);border:2px solid var(--line);border-radius:10px;
  padding:.7rem 1rem;font:600 1.1rem "IBM Plex Sans",system-ui,sans-serif}
.check{display:flex;gap:.6rem;align-items:center;font-size:.95rem}
.check input{width:1.1rem;height:1.1rem;accent-color:var(--ledger)}
.seg{display:flex;flex-wrap:wrap;gap:.4rem}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg label{cursor:pointer;padding:.5rem .9rem;border-radius:999px;border:1.5px solid var(--line);background:var(--paper);font-size:.95rem;font-weight:500;user-select:none}
.seg input:checked + label{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.seg input:focus-visible + label{outline:3px solid var(--ledger);outline-offset:2px}
.hint{font-size:.85rem;color:var(--ink-soft);margin:.4rem 0 0}

/* Ticket de resultado */
.ticket{background:var(--paper);padding:1.75rem 1.75rem 2.25rem;position:relative;border-radius:4px 4px 0 0;
  box-shadow:0 18px 40px -22px rgba(28,43,57,.45);
  -webkit-mask:radial-gradient(circle at 50% 100%,transparent 6px,#000 6.5px) bottom/12px 12px repeat-x,linear-gradient(#000,#000) top/100% calc(100% - 11px) no-repeat;
  mask:radial-gradient(circle at 50% 100%,transparent 6px,#000 6.5px) bottom/12px 12px repeat-x,linear-gradient(#000,#000) top/100% calc(100% - 11px) no-repeat}
.ticket h2{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-weight:700;font-size:1.15rem;margin:0 0 1rem;padding-bottom:.85rem;border-bottom:2px dashed var(--line)}
.row{display:flex;justify-content:space-between;gap:1rem;padding:.42rem 0;font-variant-numeric:tabular-nums}
.row .v{font-weight:600;text-align:right}
.row.minus .v{color:var(--minus)}
.row.sub{border-top:1px solid var(--line);margin-top:.35rem;padding-top:.7rem}
.total{margin-top:1rem;padding:1.1rem 1rem;background:var(--ledger-soft);border-radius:8px}
.total .k{font-size:.95rem;font-weight:600;color:var(--ledger)}
.total .big{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-weight:800;font-size:clamp(2rem,6.5vw,2.8rem);
  line-height:1.1;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--ink);overflow-wrap:anywhere}
.total .big.bump{animation:bump .25s ease-out}
@keyframes bump{from{transform:scale(1.03)}to{transform:scale(1)}}
.copy{margin-top:1.1rem;width:100%;padding:.75rem;border-radius:8px;border:1.5px solid var(--ink);background:transparent;color:var(--ink);
  font:600 .95rem "IBM Plex Sans",system-ui,sans-serif;cursor:pointer}
.copy:hover{background:var(--ink);color:var(--paper)}

/* Hoja de cálculos rápidos (porcentajes) */
.sheet{background:var(--paper);border-radius:6px;margin-top:2.25rem;box-shadow:0 18px 40px -26px rgba(28,43,57,.45)}
.line-calc{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;padding:1.3rem 1.5rem;border-bottom:1px dashed var(--line);font-size:1.1rem}
.line-calc:last-child{border-bottom:0}
.line-calc input{width:7.5rem;border:0;border-bottom:2px solid var(--line);background:transparent;color:var(--ink);
  font:700 1.3rem "Bricolage Grotesque",system-ui,sans-serif;padding:.2rem .1rem;text-align:right;font-variant-numeric:tabular-nums}
.line-calc input:focus{outline:none;border-color:var(--ledger)}
.line-calc output{font:800 1.5rem "Bricolage Grotesque",system-ui,sans-serif;color:var(--ledger);margin-left:auto;font-variant-numeric:tabular-nums}

/* Tablas */
.table{overflow-x:auto;margin:1rem 0}
.table table{border-collapse:collapse;width:100%;min-width:480px;background:var(--paper);border-radius:8px;overflow:hidden;font-variant-numeric:tabular-nums}
.table th,.table td{text-align:right;padding:.6rem .9rem;border-bottom:1px solid var(--line);font-size:.95rem}
.table th:first-child,.table td:first-child{text-align:left}
.table th{font-weight:600}
.table.text td,.table.text th{text-align:left}
.table.text td:first-child{font-weight:700;white-space:nowrap}

/* Contenido */
.content{margin-top:4rem;max-width:68ch}
.content h2{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-weight:700;font-size:1.65rem;letter-spacing:-.015em;margin:2.4rem 0 .7rem;line-height:1.15}
.content h3{font-size:1.1rem;margin:1.5rem 0 .3rem}
.content p,.content li{margin:.4rem 0 .9rem}
.content ul,.content ol{padding-left:1.3rem}
.legal h2{font-size:1.35rem}

/* Listado de herramientas (libro de cuentas) */
.ledger{margin-top:2.5rem}
.ledger h2{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-weight:700;font-size:1.3rem;margin:2.2rem 0 .6rem}
.ledger ul{list-style:none;margin:0;padding:0;background:var(--paper);border-radius:6px;box-shadow:0 18px 40px -28px rgba(28,43,57,.45)}
.ledger li{border-bottom:1px solid var(--line)}
.ledger li:last-child{border-bottom:0}
.ledger a{display:grid;grid-template-columns:minmax(0,18rem) 1fr;gap:.25rem 1.5rem;padding:1.05rem 1.4rem;text-decoration:none;color:var(--ink)}
.ledger a:hover{background:var(--ledger-soft)}
.ledger strong{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-size:1.12rem}
.ledger span{color:var(--ink-soft)}
@media (max-width:640px){.ledger a{grid-template-columns:1fr}}

.related{margin-top:3.5rem}

/* Formulario */
.form{display:flex;flex-direction:column;gap:1rem;max-width:34rem;margin-top:1.5rem}
.form label{font-weight:600;font-size:.95rem}
.form input,.form textarea{width:100%;margin-top:.3rem;background:var(--paper);color:var(--ink);border:2px solid var(--line);border-radius:10px;padding:.7rem .9rem;font:1rem "IBM Plex Sans",system-ui,sans-serif}
.form textarea{min-height:9rem;resize:vertical}
.btn{align-self:flex-start;padding:.8rem 1.4rem;border-radius:8px;border:0;background:var(--ink);color:var(--paper);font:600 1rem "IBM Plex Sans",system-ui,sans-serif;cursor:pointer}

footer{border-top:1px solid var(--line);padding:2rem 0 3rem;font-size:.9rem;color:var(--ink-soft)}
footer nav{display:flex;flex-wrap:wrap;gap:.4rem 1.25rem;margin-bottom:.8rem}
footer a{color:var(--ink-soft)}
@media (prefers-reduced-motion: reduce){.total .big.bump{animation:none}}