:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --ink: #1d2428;
  --muted: #5b6770;
  --line: #e2dfd6;
  --brand: #0f6b5c;
  --brand-ink: #ffffff;
  --brand-soft: #e3f1ed;
  --accent: #b5541c;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(20, 30, 30, 0.06), 0 4px 16px rgba(20, 30, 30, 0.05);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121615;
    --surface: #1b2120;
    --ink: #e7ecea;
    --muted: #9aa8a4;
    --line: #2c3533;
    --brand: #4fbfa8;
    --brand-ink: #0b1513;
    --brand-soft: #1d3330;
    --accent: #e3925f;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--font);
}
a { color: var(--brand); }
img { max-width: 100%; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* Cabecera y pie */
.top { border-bottom: 1px solid var(--line); background: var(--surface); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.logo span { color: var(--brand); }
.nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.95rem; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.foot { margin-top: 64px; border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 0.9rem; }

/* Tipografía */
h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); line-height: 1.15; letter-spacing: -0.02em; margin: 36px 0 10px; }
h2 { font-size: 1.35rem; margin: 40px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin: 22px 0 6px; }
.lead { color: var(--muted); font-size: 1.08rem; max-width: 62ch; margin: 0 0 24px; }
.crumbs { font-size: 0.85rem; color: var(--muted); margin-top: 20px; }
.crumbs a { color: var(--muted); }

/* Calculadora */
.calc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 760px) { .calc { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.field { margin-bottom: 16px; }
.field label, .field .label { display: block; font-weight: 600; font-size: 0.93rem; margin-bottom: 6px; }
.field small { display: block; color: var(--muted); font-size: 0.82rem; margin-top: 4px; }
.row2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
@media (max-width: 420px) { .row2 { grid-template-columns: 1fr; gap: 0; } }
.card { min-width: 0; }
input[type="number"], input[type="date"], select {
  width: 100%; min-width: 0; max-width: 100%; padding: 10px 12px; font: inherit; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
}
input:focus, select:focus { outline: 2px solid var(--brand); outline-offset: 1px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 0.93rem; margin-bottom: 10px; }
.check input { margin-top: 5px; }
.seg { display: inline-flex; max-width: 100%; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg label { margin: 0; padding: 8px 14px; font-weight: 500; cursor: pointer; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg input:checked + span { color: var(--brand-ink); }
.seg label:has(input:checked) { background: var(--brand); color: var(--brand-ink); }
.seg label:has(input:focus-visible) { outline: 2px solid var(--brand); outline-offset: -2px; }

/* Resultado */
.result { position: sticky; top: 16px; }
.big { font-size: clamp(2rem, 6vw, 2.8rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; color: var(--brand); font-variant-numeric: tabular-nums; }
.big-label { color: var(--muted); font-size: 0.9rem; margin-bottom: 2px; }
.kpis { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0; }
.kpi { background: var(--brand-soft); border-radius: 10px; padding: 10px 12px; }
.kpi b { display: block; font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.kpi span { font-size: 0.8rem; color: var(--muted); }
table.breakdown { width: 100%; border-collapse: collapse; font-size: 0.93rem; font-variant-numeric: tabular-nums; }
.breakdown td { padding: 7px 0; border-bottom: 1px solid var(--line); }
.breakdown td:last-child { text-align: right; white-space: nowrap; }
.breakdown tr.total td { font-weight: 700; border-bottom: 0; }
.breakdown tr.minus td:last-child { color: var(--accent); }
.note { font-size: 0.83rem; color: var(--muted); margin-top: 12px; }
.error { color: var(--accent); font-weight: 600; }
.alert { font-size: 0.88rem; margin: 12px 0 0; padding: 10px 12px; border-radius: 8px; border-left: 3px solid var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.alert.info { border-left-color: var(--brand); background: var(--brand-soft); }

/* Contenido editorial */
.prose { max-width: 70ch; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; margin: 12px 0; font-variant-numeric: tabular-nums; }
.prose th, .prose td { border-bottom: 1px solid var(--line); padding: 6px 8px; text-align: left; }
.prose .scroll { overflow-x: auto; }
details { border-bottom: 1px solid var(--line); padding: 12px 0; }
summary { font-weight: 600; cursor: pointer; }

/* Portada */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.tool { display: block; text-decoration: none; color: var(--ink); }
.tool:hover { border-color: var(--brand); }
.tool h3 { margin-top: 0; color: var(--brand); }
.tool p { margin: 0; color: var(--muted); font-size: 0.93rem; }
.badge { display: inline-block; font-size: 0.75rem; font-weight: 600; background: var(--brand-soft); color: var(--brand); border-radius: 999px; padding: 2px 10px; margin-bottom: 10px; }