:root {
  --bg: #f4f4f4;
  --card: #ffffff;
  --text: #1f1f1f;
  --muted: #5e5e5e;
  --border: #e0e0e0;
  --accent: #ea580c;        /* naranja de botones y detalles */
  --accent-text: #c2410c;   /* naranja más oscuro para texto, mejor legibilidad */
  --accent-soft: #fff3eb;
  --header: #2b2b2b;        /* cabecera gris oscuro */
  --header-text: #d6d6d6;
  --ok: #138a52;
  --warn: #b42318;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141414; --card: #1f1f1f; --text: #ededed; --muted: #a3a3a3;
    --border: #333333; --accent: #f97316; --accent-text: #fb923c; --accent-soft: #2a1d14;
    --header: #0d0d0d; --header-text: #bdbdbd; --warn: #f97066;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
a { color: var(--accent-text); }
header.site {
  background: var(--header); border-bottom: 3px solid var(--accent);
  position: sticky; top: 0; z-index: 10;
}
header.site .wrap { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding: 12px 16px; }
.logo { font-weight: 800; font-size: 1.2rem; text-decoration: none; color: #ffffff; }
.logo span { color: #fb923c; }
nav.main { display: flex; gap: 14px; flex-wrap: wrap; font-size: .92rem; }
nav.main a { text-decoration: none; color: var(--header-text); }
nav.main a:hover, nav.main a[aria-current] { color: #fb923c; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
main { padding: 24px 0 48px; }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.2; margin: 8px 0 6px; }
.lead { color: var(--muted); margin-top: 0; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin: 18px 0;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.tool-link {
  display: block; text-decoration: none; color: var(--text);
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; transition: border-color .15s, transform .15s;
}
.tool-link:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-link strong { display: block; font-size: 1.05rem; margin-bottom: 4px; }
.tool-link small { color: var(--muted); }
.tool-link .ico { font-size: 1.6rem; }
.tool-link:hover strong { color: var(--accent-text); }
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; }
input, select, button {
  font: inherit; width: 100%; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--accent); border-color: transparent; }
button {
  background: var(--accent); color: #fff; border: none; font-weight: 700; cursor: pointer; margin-top: 14px;
}
button.secondary { background: var(--accent-soft); color: var(--accent-text); border: 1px solid var(--accent); }
button:hover { filter: brightness(1.08); }
.result {
  margin-top: 18px; padding: 16px; border-radius: 12px; background: var(--accent-soft);
  border-left: 4px solid var(--accent);
}
.result .big { color: var(--accent-text); }
.result .big { font-size: 1.8rem; font-weight: 800; }
.result dl { display: grid; grid-template-columns: auto auto; gap: 4px 16px; margin: 8px 0 0; }
.result dt { color: var(--muted); }
.result dd { margin: 0; font-weight: 700; text-align: right; }
.muted { color: var(--muted); font-size: .88rem; }
.seg { display: flex; gap: 8px; }
.seg label { flex: 1; font-weight: 500; }
.seg input { width: auto; margin-right: 6px; }
/* Huecos reservados para anuncios de Google AdSense */
.ad-slot {
  min-height: 100px; margin: 20px 0; border: 1px dashed var(--border); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: .8rem;
}
article h2 { margin-top: 28px; font-size: 1.3rem; }
details { border-bottom: 1px solid var(--border); padding: 10px 0; }
summary { font-weight: 600; cursor: pointer; }
footer.site { border-top: 1px solid var(--border); padding: 24px 0; color: var(--muted); font-size: .85rem; }
footer.site a { color: var(--muted); margin-right: 14px; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
/* Blog */
.tag { display: inline-block; background: var(--accent-soft); color: var(--accent-text) !important; font-weight: 700;
  font-size: .75rem !important; padding: 2px 8px; border-radius: 999px; margin-bottom: 8px; text-transform: uppercase; letter-spacing: .03em; }
.post strong { margin-bottom: 8px; }
.post-body { font-size: 1.03rem; }
.post-body h2 { border-left: 4px solid var(--accent); padding-left: 10px; }
.post-body li { margin-bottom: 6px; }
ul.related { padding-left: 20px; margin: 0; }
ul.related li { margin: 6px 0; }
/* Listado del blog: filas a lo ancho, una debajo de otra */
.post-list { display: flex; flex-direction: column; gap: 14px; }
.post-row { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--accent);
  border-radius: var(--radius); padding: 18px 22px; transition: box-shadow .15s; }
.post-row:hover { box-shadow: 0 4px 16px rgba(0,0,0,.07); }
.post-row h2 { margin: 6px 0 6px; font-size: 1.3rem; line-height: 1.3; }
.post-row h2 a { color: var(--text); text-decoration: none; }
.post-row h2 a:hover { color: var(--accent-text); }
.post-row p { margin: 0 0 8px; color: var(--muted); }
.post-meta { font-size: .85rem; color: var(--muted); }
.post-meta .tag { margin: 0 6px 0 0; }
.read-more { font-weight: 700; text-decoration: none; font-size: .95rem; }
/* Índice del artículo */
.toc { background: var(--accent-soft); border-radius: 12px; padding: 14px 18px; margin: 18px 0; }
.toc ol { margin: 8px 0 0; padding-left: 20px; }
.toc li { margin: 3px 0; }
.toc a { text-decoration: none; }
.post-body h2 { scroll-margin-top: 80px; }
/* Gráficos del blog */
.post-fig { margin: 22px 0; }
.post-fig img { display: block; width: 100%; height: auto; border-radius: 16px; border: 1px solid var(--border); }
.post-fig figcaption { font-size: .85rem; color: var(--muted); margin-top: 8px; padding-left: 10px; border-left: 3px solid var(--accent); }
/* Selector de unidades */
.units { display: inline-flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; margin-bottom: 14px; }
.units label { margin: 0; padding: 8px 14px; font-weight: 600; cursor: pointer; font-size: .9rem; }
.units label { position: relative; }
.units input { position: absolute; opacity: 0; pointer-events: none; width: 1px; height: 1px; padding: 0; margin: 0; inset: 0; }
.units label:has(input:checked) { background: var(--accent); color: #fff; }
.units label:has(input:focus-visible) { outline: 2px solid var(--accent-text); outline-offset: -2px; }
.pair { display: flex; gap: 8px; }
.pair span { align-self: center; color: var(--muted); font-size: .9rem; }
/* Campos de una misma fila alineados por abajo aunque una etiqueta ocupe dos líneas */
.fields > div { display: flex; flex-direction: column; justify-content: flex-end; min-width: 0; }
select { text-overflow: ellipsis; }
/* Lo oculto siempre queda oculto, aunque otra regla le dé display */
[hidden] { display: none !important; }