/* ============================================================
   Sistema de diseño — "Libro de Cuentas"
   Paleta: papel gris-verdoso + tinta marina + verde (crecimiento) + latón (acento)
   ============================================================ */

:root{
  --paper: #EFE8D8;
  --paper-dim: #E4DAC3;
  --paper-line: #D2C4A3;
  --ink: #24303D;
  --ink-soft: #4B5A66;
  --green: #2E5D45;
  --green-deep: #1F4433;
  --brass: #B5772E;
  --brass-warm: #D68A3C;
  --white: #FFFDF8;
  --error: #A03A2C;
  --shadow: 0 1px 2px rgba(90, 62, 20, .05), 0 8px 24px -12px rgba(90, 62, 20, .18);
  --shadow-lg: 0 4px 10px rgba(90, 62, 20, .06), 0 20px 40px -16px rgba(90, 62, 20, .22);
  --radius: 14px;
  --radius-sm: 9px;

  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;

  --max-w: 920px;
}

@media (prefers-reduced-motion: no-preference){
  .ledger-panel, .result-figure{ transition: background-color .2s ease; }
}
@media (prefers-reduced-motion: reduce){
  *{ scroll-behavior: auto !important; animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a{ color: var(--green-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover{ color: var(--brass); }
a:focus-visible, button:focus-visible, input:focus-visible{
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

img{ max-width: 100%; display: block; }

h1, h2, h3{
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 .5em;
}
h1{ font-size: clamp(2rem, 4vw + 1rem, 3.1rem); font-weight: 500; letter-spacing: -0.01em; }
h2{ font-size: clamp(1.4rem, 1.5vw + 1rem, 1.9rem); }
h3{ font-size: 1.2rem; }

p{ margin: 0 0 1em; max-width: 68ch; }
.content-block p, .content-block li{ max-width: 62ch; }

.wrap{
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header{
  border-bottom: 1px solid var(--paper-line);
  padding: 22px 0;
}
.site-header .wrap{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.logo{
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}
.logo:hover{ color: var(--ink); }
.logo span{ color: var(--green-deep); }

nav.main-nav{
  display: flex;
  gap: 22px;
  font-size: .95rem;
}
nav.main-nav a{
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
nav.main-nav a:hover{ color: var(--green-deep); border-bottom-color: var(--green-deep); }

/* ---------- Hero ---------- */
.hero{ padding: 60px 0 36px; position: relative; }
.hero .kicker{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: .85rem;
  font-weight: 500;
  color: var(--brass);
  background: var(--paper-dim);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 20px;
}
.hero .kicker svg{ width: 16px; height: 16px; flex: none; }
.hero p.lede{ font-size: 1.15rem; color: var(--ink-soft); }
.hero-icons{
  display: flex;
  gap: 10px;
  margin-top: 28px;
}
.hero-icons span{
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--paper-line);
  display: flex; align-items: center; justify-content: center;
  color: var(--brass);
  box-shadow: var(--shadow);
}
.hero-icons span svg{ width: 18px; height: 18px; }

/* ---------- Ledger panel (inputs) ---------- */
.ledger-panel{
  background: var(--white);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 6px 0;
  margin: 28px 0;
  box-shadow: var(--shadow);
}
.ledger-row{
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--paper-line);
}
.ledger-row:last-of-type{ border-bottom: none; }
.ledger-row label{
  font-size: .95rem;
  color: var(--ink-soft);
}
.ledger-row .field{
  display: flex;
  align-items: center;
  gap: 6px;
}
.ledger-row input[type="number"], .ledger-row input[type="range"]{
  font-family: var(--mono);
  font-size: 1.05rem;
  color: var(--ink);
  border: none;
  background: transparent;
  text-align: right;
  width: 130px;
  padding: 4px 2px;
}
.ledger-row input[type="range"]{ width: 100%; accent-color: var(--green-deep); }
.ledger-row .unit{ font-family: var(--mono); color: var(--ink-soft); font-size: .95rem; }
.ledger-row select{
  font-family: var(--sans);
  font-size: .95rem;
  border: 1px solid var(--paper-line);
  background: var(--white);
  padding: 6px 8px;
  border-radius: 6px;
  color: var(--ink);
}

/* ---------- Result ---------- */
.result-panel{
  background: linear-gradient(155deg, var(--ink) 0%, #1a2530 100%);
  color: var(--white);
  border-radius: var(--radius);
  padding: 28px 26px;
  margin: 0 0 28px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.result-panel::before{
  content: "";
  position: absolute;
  top: -40%; right: -10%;
  width: 220px; height: 220px;
  background: radial-gradient(circle, rgba(214,138,60,.16) 0%, transparent 70%);
  pointer-events: none;
}
.result-panel .result-label{
  font-family: var(--mono);
  font-size: .8rem;
  color: #A9BCC9;
  margin-bottom: 6px;
}
.result-figure{
  font-family: var(--mono);
  font-size: clamp(2.1rem, 3vw + 1rem, 3rem);
  font-weight: 500;
  color: var(--brass-warm);
  letter-spacing: -0.01em;
}
.result-breakdown{
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid #33465A;
}
.result-breakdown div{ min-width: 140px; }
.result-breakdown .k{ font-family: var(--mono); font-size: .78rem; color: #A9BCC9; }
.result-breakdown .v{ font-family: var(--mono); font-size: 1.2rem; color: var(--white); }

/* ---------- Calculator index list ---------- */
.calc-index{ margin: 28px 0 60px; display: flex; flex-direction: column; gap: 12px; }
.calc-index a.calc-row{
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 20px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  background: var(--white);
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow);
}
.calc-index a.calc-row:hover{
  border-color: var(--brass-warm);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}
.calc-index a.calc-row:hover .calc-title{ color: var(--green-deep); }
.calc-icon{
  flex: none;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--paper-dim);
  display: flex; align-items: center; justify-content: center;
  color: var(--brass);
}
.calc-index a.calc-row:hover .calc-icon{ background: #F3E4C8; }
.calc-icon svg{ width: 22px; height: 22px; }
.calc-body{ flex: 1 1 auto; }
.calc-title{ font-family: var(--serif); font-size: 1.2rem; }
.calc-desc{ color: var(--ink-soft); font-size: .93rem; max-width: 46ch; margin-top: 2px; }
.calc-arrow{ font-family: var(--mono); color: var(--paper-line); font-size: 1.3rem; flex: none; }
.calc-index a.calc-row:hover .calc-arrow{ color: var(--brass-warm); }

/* ---------- Content sections ---------- */
.content-block{ padding: 8px 0 40px; }
.content-block h2{ margin-top: 1.6em; }
.content-block ul{ padding-left: 1.2em; }
.example-box{
  background: var(--paper-dim);
  border-left: 3px solid var(--brass-warm);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: .95rem;
}
.example-box p:last-child{ margin-bottom: 0; }

/* ---------- Ad slots ---------- */
.ad-slot{
  max-width: var(--max-w);
  margin: 32px auto;
  padding: 0 24px;
}
.ad-slot .ad-inner{
  border: 1px dashed var(--paper-line);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: .78rem;
  text-align: center;
  padding: 18px;
  border-radius: var(--radius-sm);
}

/* ---------- Footer ---------- */
.site-footer{
  border-top: 1px solid var(--paper-line);
  padding: 32px 0 48px;
  margin-top: 40px;
}
.site-footer .wrap{
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: .85rem;
  color: var(--ink-soft);
}
.site-footer a{ color: var(--ink-soft); margin-right: 18px; text-decoration: none; }
.site-footer a:hover{ color: var(--green-deep); }
.site-footer .fine{ font-family: var(--mono); font-size: .78rem; }

/* ---------- Disclaimer ---------- */
.disclaimer{
  font-size: .85rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--paper-line);
  padding-top: 14px;
  margin-top: 22px;
}

@media (max-width: 640px){
  .ledger-row{ grid-template-columns: 1fr; }
  .ledger-row .field{ justify-content: flex-end; }
}