:root{
    --paper:#E9EDE4;
    --panel:#FBFCF9;
    --graphite:#22252A;
    --graphite-2:#2D3036;
    --lcd-bg:#C9D8BC;
    --lcd-bg-dark:#B7C8A9;
    --lcd-ink:#1D2A18;
    --amber:#D9A234;
    --amber-dark:#B9861F;
    --teal:#2E6E7E;
    --teal-dark:#235663;
    --ink:#20232A;
    --muted:#63666D;
    --line: rgba(34,37,42,0.12);
    --radius-key: 14px;
    --radius-panel: 18px;
    --shadow-key: 0 3px 0 rgba(0,0,0,0.18);
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:'Inter', system-ui, sans-serif;
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3, .display-font{
    font-family:'Space Grotesk', sans-serif;
    letter-spacing:-0.01em;
    margin:0;
  }
  .mono{ font-family:'JetBrains Mono', monospace; }
  a{color:var(--teal-dark);}

  @media (prefers-reduced-motion: reduce){
    *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
  }

  /* ---------- Topbar ---------- */
  .topbar{
    position:sticky; top:0; z-index:50;
    background:var(--graphite);
    color:#EDEFE8;
    padding:14px 24px;
    display:flex; align-items:center; justify-content:space-between; gap:16px;
    border-bottom:4px solid var(--amber);
    flex-wrap:wrap;
  }
  .brand{
    display:flex; align-items:center; gap:10px;
    font-family:'Space Grotesk', sans-serif;
    font-weight:700;
    font-size:1.15rem;
  }
  .brand .chip{
    width:12px; height:12px; border-radius:3px;
    background:var(--amber);
    box-shadow: 16px 0 0 var(--teal), 32px 0 0 #EDEFE8;
    margin-right:26px;
  }
  .top-right{ display:flex; align-items:center; gap:14px; flex-wrap:wrap; }
  nav.cats{ display:flex; gap:6px; flex-wrap:wrap; }
  nav.cats a{
    color:#D9DCD3; text-decoration:none;
    font-size:0.85rem; font-weight:500;
    padding:8px 12px; border-radius:8px;
    border:1px solid rgba(255,255,255,0.12);
    white-space:nowrap;
  }
  nav.cats a:hover{ background:rgba(255,255,255,0.08); color:#fff; }

  .lang-switch{
    display:flex; border:1.5px solid rgba(255,255,255,0.2); border-radius:20px; overflow:hidden; flex:none;
  }
  .lang-switch button{
    font-family:'JetBrains Mono', monospace; font-size:0.78rem; font-weight:700;
    padding:7px 13px; border:none; background:transparent; color:#C7CABF; cursor:pointer;
  }
  .lang-switch button.active{ background:var(--amber); color:#2A1E05; }

  /* ---------- Hero ---------- */
  .hero{
    padding:64px 24px 48px;
    max-width:1120px; margin:0 auto;
    display:grid; grid-template-columns: 1.1fr 1fr; gap:48px; align-items:center;
  }
  .hero h1{ font-size:clamp(2rem, 4vw, 2.9rem); line-height:1.08; }
  .hero h1 em{ font-style:normal; color:var(--teal-dark); }
  .hero p.lead{ margin-top:16px; color:var(--muted); font-size:1.05rem; max-width:48ch; }
  .hero .cta-row{ margin-top:26px; display:flex; gap:12px; flex-wrap:wrap; }
  .btn{
    display:inline-block; text-decoration:none;
    font-family:'Space Grotesk', sans-serif; font-weight:600;
    padding:12px 20px; border-radius:var(--radius-key);
    border:none; cursor:pointer; font-size:0.95rem;
  }
  .btn-amber{ background:var(--amber); color:#2A1E05; box-shadow:0 3px 0 var(--amber-dark); }
  .btn-amber:active{ transform:translateY(3px); box-shadow:none; }
  .btn-outline{ background:transparent; color:var(--ink); border:1.5px solid var(--line); }

  .lcd-device{
    background:var(--graphite);
    border-radius:22px;
    padding:18px;
    box-shadow:0 18px 34px rgba(20,22,18,0.22);
  }
  .lcd-screen{
    background:var(--lcd-bg);
    border-radius:10px;
    padding:22px 20px 18px;
    position:relative;
    overflow:hidden;
  }
  .lcd-screen::before{
    content:"";
    position:absolute; inset:0;
    background:repeating-linear-gradient(0deg, rgba(0,0,0,0.045) 0px, rgba(0,0,0,0.045) 1px, transparent 1px, transparent 3px);
    pointer-events:none;
  }
  .lcd-label{
    font-family:'JetBrains Mono', monospace;
    font-size:0.72rem; letter-spacing:0.08em; text-transform:uppercase;
    color:var(--lcd-ink); opacity:0.65;
  }
  .lcd-expr{
    font-family:'JetBrains Mono', monospace;
    color:var(--lcd-ink); opacity:0.85;
    font-size:1rem; margin-top:10px; min-height:1.4em;
  }
  .lcd-result{
    font-family:'JetBrains Mono', monospace;
    color:var(--lcd-ink);
    font-size:2.1rem; font-weight:700;
    margin-top:2px; min-height:1.3em;
  }
  .lcd-dots{ display:flex; gap:6px; margin-top:16px; }
  .lcd-dots span{ width:6px; height:6px; border-radius:50%; background:var(--lcd-ink); opacity:0.25; }
  .lcd-dots span.active{ opacity:0.8; }
  .lcd-keys-row{ display:flex; gap:8px; margin-top:14px; justify-content:flex-end; }
  .lcd-keys-row .k{ width:26px; height:20px; border-radius:5px; background:var(--graphite-2); }
  .lcd-keys-row .k.amber{ background:var(--amber); }
  .lcd-keys-row .k.teal{ background:var(--teal); }

  /* ---------- How it works ---------- */
  .howit{
    max-width:1120px; margin:0 auto; padding:0 24px;
  }
  .howit-box{
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-panel);
    padding:22px 26px; display:flex; gap:20px; align-items:flex-start; flex-wrap:wrap;
  }
  .howit-box .howit-badge{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem; text-transform:uppercase; letter-spacing:0.08em;
    color:var(--teal-dark); background:rgba(46,110,126,0.1); padding:5px 10px; border-radius:6px; flex:none;
  }
  .howit-box p{ margin:0; color:var(--muted); max-width:80ch; font-size:0.96rem; }
  .howit-box h3{ font-size:1.1rem; margin-bottom:6px; }

  /* ---------- Categories / sections ---------- */
  main{ max-width:1120px; margin:0 auto; padding:0 24px 40px; }
  section.category{ margin-top:64px; scroll-margin-top:90px; }
  .cat-head{ display:flex; align-items:baseline; gap:14px; margin-bottom:22px; flex-wrap:wrap; }
  .cat-head .tag{
    font-family:'JetBrains Mono', monospace; font-size:0.78rem; color:var(--teal-dark);
    background:rgba(46,110,126,0.1); padding:4px 10px; border-radius:6px;
  }
  .cat-head h2{ font-size:1.55rem; }
  .cat-sub{ color:var(--muted); margin-top:4px; max-width:70ch; font-size:0.96rem; }

  .keypad{ display:grid; grid-template-columns:repeat(auto-fit, minmax(230px, 1fr)); gap:14px; }

  details.calc{
    background:var(--panel);
    border-radius:var(--radius-panel);
    border:1px solid var(--line);
    overflow:hidden;
  }
  details.calc > summary{
    list-style:none; cursor:pointer;
    padding:18px 20px;
    display:flex; align-items:center; justify-content:space-between; gap:10px;
    font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:1.02rem;
  }
  details.calc > summary::-webkit-details-marker{ display:none; }
  details.calc > summary .key-icon{
    width:34px; height:34px; border-radius:9px; flex:none;
    display:flex; align-items:center; justify-content:center;
    background:var(--graphite); color:var(--amber);
    font-family:'JetBrains Mono', monospace; font-weight:700; font-size:0.95rem;
    box-shadow:var(--shadow-key);
  }
  details.calc > summary .sum-text{ flex:1; }
  details.calc > summary .arrow{ margin-left:auto; color:var(--muted); font-size:1.1rem; transition:transform .2s ease; }
  details.calc[open] > summary .arrow{ transform:rotate(180deg); }
  details.calc[open] > summary{ border-bottom:1px solid var(--line); }
  .calc-body{ padding:20px 22px 24px; }

  .field-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(180px,1fr)); gap:14px; }
  label.field{ display:flex; flex-direction:column; gap:6px; font-size:0.86rem; color:var(--muted); font-weight:500; }
  label.field input, label.field select{
    font-family:'Inter', sans-serif;
    font-size:1rem; color:var(--ink);
    padding:12px; border-radius:10px;
    border:1.5px solid var(--line); background:#fff;
  }
  label.field input:focus, label.field select:focus, button:focus-visible, a:focus-visible, summary:focus-visible{
    outline:3px solid var(--teal); outline-offset:1px;
  }

  .row-actions{ display:flex; gap:10px; margin-top:16px; flex-wrap:wrap; }
  .btn-calc{ background:var(--teal); color:#fff; box-shadow:0 3px 0 var(--teal-dark); }
  .btn-calc:active{ transform:translateY(3px); box-shadow:none; }
  .btn-reset{ background:transparent; border:1.5px solid var(--line); color:var(--muted); }

  .result-box{ margin-top:18px; background:var(--lcd-bg); border-radius:12px; padding:16px 18px; color:var(--lcd-ink); }
  .result-box .r-label{ font-family:'JetBrains Mono', monospace; font-size:0.72rem; text-transform:uppercase; letter-spacing:0.07em; opacity:0.65; }
  .result-box .r-value{ font-family:'JetBrains Mono', monospace; font-size:1.7rem; font-weight:700; margin-top:2px; }
  .result-box .r-extra{ margin-top:10px; font-size:0.88rem; opacity:0.85; display:grid; gap:4px; }
  .note{ margin-top:12px; font-size:0.82rem; color:var(--muted); }

  table.breakdown{ width:100%; border-collapse:collapse; margin-top:10px; font-size:0.88rem; }
  table.breakdown th, table.breakdown td{ text-align:left; padding:6px 8px; border-bottom:1px solid var(--line); }
  table.breakdown th{ color:var(--muted); font-weight:600; font-size:0.78rem; text-transform:uppercase; letter-spacing:0.04em; }

  .mode-tabs{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:16px; }
  .mode-tabs button{
    font-family:'Inter', sans-serif; font-size:0.85rem; font-weight:600;
    padding:8px 14px; border-radius:20px; border:1.5px solid var(--line);
    background:#fff; color:var(--muted); cursor:pointer;
  }
  .mode-tabs button.active{ background:var(--graphite); color:var(--amber); border-color:var(--graphite); }
  .mode-group{ display:none; }
  .mode-group.active{ display:block; }

  .sci-wrap{ display:flex; flex-direction:column; align-items:center; gap:16px; }
  .sci-screen{ width:100%; max-width:420px; background:var(--lcd-bg); border-radius:12px; padding:16px 18px; text-align:right; }
  .sci-screen .sci-sub{ font-family:'JetBrains Mono', monospace; font-size:0.85rem; color:var(--lcd-ink); opacity:0.6; min-height:1.2em; word-break:break-all; }
  .sci-screen .sci-main{ font-family:'JetBrains Mono', monospace; font-size:2rem; font-weight:700; color:var(--lcd-ink); word-break:break-all; }
  .sci-pad{ width:100%; max-width:420px; display:grid; grid-template-columns:repeat(5, 1fr); gap:8px; }
  .sci-pad button{
    font-family:'JetBrains Mono', monospace; font-size:0.92rem; font-weight:600;
    padding:12px 4px; border-radius:10px; border:none; cursor:pointer;
    background:var(--graphite-2); color:#EDEFE8; box-shadow:var(--shadow-key);
  }
  .sci-pad button:active{ transform:translateY(3px); box-shadow:none; }
  .sci-pad button.num{ background:#3B3F46; }
  .sci-pad button.op{ background:var(--amber); color:#2A1E05; box-shadow:0 3px 0 var(--amber-dark); }
  .sci-pad button.eq{ background:var(--teal); color:#fff; box-shadow:0 3px 0 var(--teal-dark); }
  .sci-pad button.fn{ background:#464B53; font-size:0.78rem; }
  .sci-pad button.clear{ background:#7A3B32; }

  /* ---------- Legal ---------- */
  section.legal{ margin-top:64px; scroll-margin-top:90px; }
  .legal-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(240px,1fr)); gap:14px; }
  details.legal-item{ background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-panel); overflow:hidden; }
  details.legal-item > summary{
    list-style:none; cursor:pointer; padding:16px 20px;
    font-family:'Space Grotesk', sans-serif; font-weight:600; display:flex; justify-content:space-between; align-items:center;
  }
  details.legal-item > summary::-webkit-details-marker{ display:none; }
  details.legal-item .legal-body{ padding:0 20px 20px; color:var(--muted); font-size:0.92rem; }
  details.legal-item .legal-body p{ margin:0 0 10px; }

  footer{ background:var(--graphite); color:#C7CABF; padding:36px 24px 28px; margin-top:40px; font-size:0.86rem; }
  footer .foot-inner{ max-width:1120px; margin:0 auto; display:flex; justify-content:space-between; gap:28px; flex-wrap:wrap; }
  footer strong{ color:#EDEFE8; }
  footer .foot-col{ max-width:340px; }
  footer nav.foot-nav{ display:flex; flex-direction:column; gap:6px; }
  footer nav.foot-nav a, footer .foot-legal a{
    color:#C7CABF; text-decoration:none; font-size:0.85rem;
  }
  footer nav.foot-nav a:hover, footer .foot-legal a:hover{ color:#fff; text-decoration:underline; }
  footer .foot-legal{ display:flex; gap:16px; flex-wrap:wrap; margin-top:10px; }
  footer .foot-bottom{
    max-width:1120px; margin:24px auto 0; padding-top:16px; border-top:1px solid rgba(255,255,255,0.12);
    display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap; font-size:0.78rem; color:#9A9D93;
  }

  @media (max-width:860px){
    .hero{ grid-template-columns:1fr; padding-top:36px; }
    nav.cats{
      width:100%; flex-wrap:nowrap; overflow-x:auto; -webkit-overflow-scrolling:touch;
      padding-bottom:4px;
    }
    nav.cats a{ flex:none; }
    footer .foot-inner{ flex-direction:column; }
  }

/* =====================================================================
   Añadidos para el sitio multi-página
   ===================================================================== */

/* Encabezado de cada página de herramienta */
.breadcrumb{ font-size:0.82rem; color:var(--muted); margin-bottom:10px; }
.breadcrumb a{ color:var(--teal-dark); text-decoration:none; }
.breadcrumb a:hover{ text-decoration:underline; }

.page-hero{ max-width:1120px; margin:0 auto; padding:40px 24px 8px; }
.page-hero h1{ font-size:clamp(1.7rem, 3.4vw, 2.3rem); line-height:1.15; }
.page-hero .lead{ margin-top:14px; color:var(--muted); font-size:1.02rem; max-width:70ch; }

/* Tarjeta de herramienta autónoma (sin <details>, siempre visible) */
main{ max-width:1120px; margin:0 auto; padding:0 24px 60px; }
.tool-standalone{
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-panel);
  overflow:hidden; margin-top:20px;
}
.tool-standalone .calc-body{ padding:24px 26px 28px; }

/* Herramientas relacionadas */
.related-tools{ margin-top:28px; }
.related-tools h3{ font-size:1.05rem; margin-bottom:12px; }
.related-tools ul{ list-style:none; margin:0; padding:0; display:grid; grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); gap:10px; }
.related-tools a{
  display:block; text-decoration:none; color:var(--ink); font-weight:600; font-size:0.92rem;
  background:var(--panel); border:1px solid var(--line); border-radius:12px; padding:12px 14px;
}
.related-tools a:hover{ border-color:var(--teal); }
.related-tools a span{ display:block; font-weight:400; color:var(--muted); font-size:0.82rem; margin-top:3px; }

/* Catálogo de herramientas en el index (tarjetas-enlace) */
.tool-link-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(230px, 1fr)); gap:14px; }
.tool-link-card{
  display:block; text-decoration:none; color:var(--ink);
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-panel);
  padding:18px 20px; transition:border-color .15s ease;
}
.tool-link-card:hover{ border-color:var(--teal); }
.tool-link-card .tlc-top{ display:flex; align-items:center; gap:12px; }
.tool-link-card .key-icon{
  width:34px; height:34px; border-radius:9px; flex:none;
  display:flex; align-items:center; justify-content:center;
  background:var(--graphite); color:var(--amber);
  font-family:'JetBrains Mono', monospace; font-weight:700; font-size:0.95rem;
  box-shadow:var(--shadow-key);
}
.tool-link-card .tlc-title{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:1.02rem; }
.tool-link-card p{ margin:10px 0 0; color:var(--muted); font-size:0.86rem; }

/* Página legal simple */
.legal-page{ max-width:800px; margin:0 auto; padding:40px 24px 60px; }
.legal-page h1{ font-size:1.8rem; margin-bottom:18px; }
.legal-page p{ color:var(--muted); margin:0 0 14px; line-height:1.6; }
.legal-page a{ color:var(--teal-dark); }

/* Bloque de contenido explicativo (guía de uso + contexto) */
.content-block{
  margin-top:28px; background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-panel);
  padding:24px 26px;
}
.content-block h2{ font-size:1.15rem; margin-bottom:14px; }
.content-block ol{ margin:0 0 16px; padding-left:22px; color:var(--ink); }
.content-block ol li{ margin-bottom:8px; line-height:1.55; }
.content-block p{ color:var(--muted); margin:0; line-height:1.6; }

/* Checkbox de campo (ej. "incluir último día", "excluir fines de semana") */
label.field-check{
  display:flex; align-items:center; gap:10px; margin-top:14px;
  font-size:0.9rem; color:var(--ink); font-weight:500; cursor:pointer;
}
label.field-check input[type="checkbox"]{ width:18px; height:18px; accent-color:var(--teal); flex:none; }

/* Textarea (feriados) */
label.field textarea{
  font-family:'Inter', sans-serif; font-size:0.92rem; color:var(--ink);
  padding:10px 12px; border-radius:10px; border:1.5px solid var(--line); background:#fff;
  resize:vertical;
}

/* Cuenta regresiva: display grande de dígitos */
.countdown-display{ display:grid; grid-template-columns:repeat(4, 1fr); gap:10px; margin-top:8px; }
.cd-unit{ text-align:center; }
.cd-unit .cd-num{
  display:block; font-family:'JetBrains Mono', monospace; font-size:2.2rem; font-weight:700;
  color:var(--lcd-ink);
}
.cd-unit .cd-lbl{ display:block; font-size:0.72rem; text-transform:uppercase; letter-spacing:0.06em; opacity:0.7; margin-top:2px; }