:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5b6168;
  --border: #dedad3;
  --accent: #c2410c;
  --accent-soft: #fdeee4;
  --ok: #166534;
  --radius: 10px;
  --max: 980px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181b;
    --surface: #1f2226;
    --text: #e8e6e3;
    --muted: #a3a8ae;
    --border: #33373d;
    --accent: #fb923c;
    --accent-soft: #2c211a;
    --ok: #4ade80;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
img, svg { max-width: 100%; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Cabecera y pie */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; flex-wrap: wrap; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.logo svg { width: 28px; height: 28px; }
.site-nav { display: flex; gap: 16px; flex-wrap: wrap; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--accent); }

.site-footer { margin-top: 56px; border-top: 1px solid var(--border); background: var(--surface); font-size: .9rem; color: var(--muted); }
.site-footer .wrap { padding-top: 24px; padding-bottom: 32px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 10px; }
.site-footer a { color: var(--muted); }

/* Contenido */
main { padding-top: 24px; }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.2; margin: .2em 0 .4em; }
h2 { font-size: 1.35rem; margin: 1.8em 0 .5em; line-height: 1.3; }
h3 { font-size: 1.1rem; margin: 1.4em 0 .4em; }
.lead { font-size: 1.08rem; color: var(--muted); margin-top: 0; }
.breadcrumb { font-size: .88rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.breadcrumb li + li::before { content: "›"; margin-right: 6px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.note { background: var(--accent-soft); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 6px; font-size: .95rem; }

/* Calculadora */
.calc { display: grid; gap: 20px; grid-template-columns: 1fr; }
@media (min-width: 820px) { .calc { grid-template-columns: 1.1fr 1fr; align-items: start; } }
.calc fieldset { border: 0; padding: 0; margin: 0 0 14px; }
.calc legend { font-weight: 600; margin-bottom: 8px; padding: 0; }
.field { margin-bottom: 12px; }
.field label { display: block; font-weight: 600; font-size: .93rem; margin-bottom: 4px; }
.field .hint { display: block; font-weight: 400; color: var(--muted); font-size: .84rem; }
.row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
input[type="number"], select {
  width: 100%; font: inherit; font-size: 1rem; padding: 10px 12px;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
}
input:focus-visible, select:focus-visible, button:focus-visible, .segmented label:focus-within {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 1px;
}
.segmented { display: flex; flex-wrap: wrap; gap: 6px; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label {
  cursor: pointer; padding: 8px 12px; border: 1px solid var(--border); border-radius: 999px;
  font-size: .9rem; background: var(--bg); user-select: none;
}
.segmented input:checked + span { color: var(--accent); font-weight: 700; }
.segmented label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }

.results h2 { margin-top: 0; font-size: 1.15rem; }
.big { font-size: 2rem; font-weight: 800; line-height: 1.1; color: var(--accent); }
.big small { font-size: 1rem; font-weight: 600; color: var(--muted); }
.result-list { list-style: none; padding: 0; margin: 14px 0 0; }
.result-list li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-top: 1px solid var(--border); }
.result-list li span:last-child { font-weight: 700; text-align: right; font-variant-numeric: tabular-nums; }
.result-sub { color: var(--muted); font-size: .88rem; font-weight: 400; display: block; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
button {
  font: inherit; font-size: .95rem; cursor: pointer; padding: 9px 14px; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--accent); color: #fff; font-weight: 600;
}
button.secondary { background: transparent; color: var(--accent); }
.error { color: #b91c1c; font-size: .9rem; min-height: 1.2em; }
@media (prefers-color-scheme: dark) { .error { color: #f87171; } }

/* Tablas */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; background: var(--surface); }
th, td { padding: 8px 10px; border: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: var(--accent-soft); }
td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Portada */
.tools { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin-top: 20px; }
.tool-card { display: block; text-decoration: none; color: var(--text); }
.tool-card:hover { border-color: var(--accent); }
.tool-card h2 { margin: 0 0 6px; font-size: 1.15rem; color: var(--accent); }
.tool-card p { margin: 0; color: var(--muted); font-size: .95rem; }

details { border-top: 1px solid var(--border); padding: 12px 0; }
details summary { cursor: pointer; font-weight: 600; }
details p { margin: .6em 0 0; }

/* Huecos para anuncios: se activan tras la aprobación de AdSense */
.ad-slot { margin: 24px 0; min-height: 0; }

@media print {
  .site-header, .site-footer, .actions, .ad-slot, article > :not(.calc):not(h1) { display: none !important; }
  body { background: #fff; color: #000; }
}