/* =========================================================
   climatizacion.quieroalgo.com — estilos base
   CSS nativo · Mobile-first · Sin frameworks
   ========================================================= */

/* ---------- 1. Variables ---------- */
:root {
  --c-blue-900: #0b3a5b;
  --c-blue-700: #12507e;
  --c-blue-600: #1769aa;
  --c-blue-100: #e7f1fa;
  --c-blue-50:  #f3f8fc;
  --c-green-700: #17704a;
  --c-green-600: #1f8a5b;
  --c-green-100: #e4f4eb;
  --c-amber-600: #b26a00;
  --c-text: #1b2733;
  --c-muted: #556677;
  --c-border: #d6e2ec;
  --c-bg: #f7fafc;
  --c-surface: #ffffff;

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --fs-sm: .875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: clamp(1.35rem, 1.1rem + 1vw, 1.75rem);
  --fs-2xl: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(11,58,91,.06), 0 4px 16px rgba(11,58,91,.06);
  --gap: 1rem;
  --maxw: 1180px;
  --measure: 70ch;
}

/* ---------- 2. Reset mínimo ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--c-blue-600); text-underline-offset: 2px; }
a:hover { color: var(--c-blue-900); }
h1, h2, h3 { line-height: 1.2; color: var(--c-blue-900); margin: 0 0 .6em; }
h1 { font-size: var(--fs-2xl); letter-spacing: -.01em; }
h2 { font-size: var(--fs-xl); margin-top: 1.6em; }
h3 { font-size: var(--fs-lg); margin-top: 1.3em; }
p, ul, ol, table { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--c-blue-600); outline-offset: 2px; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--c-blue-900); color: #fff; padding: .5rem 1rem; z-index: 10; }
.skip-link:focus { left: 1rem; }

/* ---------- 3. Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 16px; }
.layout { display: grid; gap: calc(var(--gap) * 1.5); padding-block: 1.25rem 2.5rem; }
.layout__main { min-width: 0; }

@media (min-width: 1024px) {
  .container { padding-inline: 24px; }
  .layout { grid-template-columns: minmax(0, 1fr); max-width: 900px; margin-inline: auto; }
}

/* ---------- 4. Header / Nav ---------- */
.site-header { background: var(--c-blue-900); color: #fff; }
.site-header__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1rem; padding-block: .75rem; }
.brand { display: flex; align-items: center; gap: .5rem; color: #fff; text-decoration: none; font-weight: 700; font-size: 1.05rem; }
.brand:hover { color: #fff; }
.brand__logo { width: 28px; height: 28px; flex: none; }
.brand__sub { font-weight: 400; opacity: .75; }
.nav { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.nav__list { display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0; white-space: nowrap; }
.nav__link { display: block; padding: .45rem .7rem; border-radius: var(--radius-sm); color: #d9e9f6; text-decoration: none; font-size: var(--fs-sm); }
.nav__link:hover, .nav__link[aria-current="page"] { background: rgba(255,255,255,.12); color: #fff; }
@media (min-width: 768px) { .nav { width: auto; } }

/* ---------- 5. Hero ---------- */
.hero { padding-block: 1.25rem .25rem; }
.hero__lead { font-size: var(--fs-lg); color: var(--c-muted); max-width: var(--measure); }
.badges { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; padding: 0; margin: 0 0 1rem; }
.badge { font-size: var(--fs-sm); background: var(--c-green-100); color: var(--c-green-700); padding: .2rem .65rem; border-radius: 999px; font-weight: 600; }

/* ---------- 6. Tarjetas y bloques ---------- */
.card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.25rem; }
.section { margin-top: 2rem; }
.grid-cards { display: grid; gap: var(--gap); grid-template-columns: 1fr; list-style: none; padding: 0; margin: 0; }
@media (min-width: 640px) { .grid-cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .grid-cards { grid-template-columns: repeat(3, 1fr); } }
.hub { display: flex; flex-direction: column; height: 100%; text-decoration: none; color: inherit; transition: border-color .15s, transform .15s; }
.hub:hover { border-color: var(--c-blue-600); transform: translateY(-2px); color: inherit; }
.hub__kicker { font-size: var(--fs-sm); color: var(--c-green-700); font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.hub__title { font-size: var(--fs-lg); margin: .35rem 0 .5rem; }
.hub__text { color: var(--c-muted); margin: 0; flex: 1; }
.hub__more { margin-top: .75rem; color: var(--c-blue-600); font-weight: 600; }

/* ---------- 7. Calculadora ---------- */
.calc { padding: 1.25rem; }
.calc__title { margin-top: 0; }
.calc__grid { display: grid; gap: 1.25rem; }
@media (min-width: 768px) { .calc__grid { grid-template-columns: 1fr 1fr; } }

.form { display: grid; gap: 1rem; }
.field { display: grid; gap: .35rem; }
.field__label { font-weight: 600; font-size: var(--fs-sm); color: var(--c-blue-900); }
.field__hint { font-size: .8rem; color: var(--c-muted); }
.input, .select {
  width: 100%; min-height: 44px; padding: .55rem .75rem;
  font: inherit; color: inherit; background: #fff;
  border: 1px solid var(--c-border); border-radius: var(--radius-sm);
}
.input:focus, .select:focus { border-color: var(--c-blue-600); outline: 2px solid var(--c-blue-100); }
.input-group { display: flex; align-items: stretch; }
.input-group .input { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.input-group__addon { display: flex; align-items: center; padding: 0 .75rem; background: var(--c-blue-50); border: 1px solid var(--c-border); border-left: 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--c-muted); font-size: var(--fs-sm); }
.field-row { display: grid; gap: 1rem; grid-template-columns: 1fr 1fr; }

.segmented { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: .25rem; padding: .25rem; background: var(--c-blue-50); border: 1px solid var(--c-border); border-radius: var(--radius-sm); margin: 0; }
.segmented legend { padding: 0; margin-bottom: .35rem; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label { display: flex; align-items: center; justify-content: center; min-height: 40px; padding: .25rem .5rem; border-radius: 6px; cursor: pointer; font-size: var(--fs-sm); text-align: center; color: var(--c-muted); }
.segmented input:checked + label { background: #fff; color: var(--c-blue-900); font-weight: 700; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.segmented input:focus-visible + label { outline: 2px solid var(--c-blue-600); }
.fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }

.error { color: #b42318; font-size: .8rem; min-height: 1.2em; }

/* Resultados: altura reservada para que no haya saltos (CLS) */
.results { background: var(--c-blue-900); color: #fff; border-radius: var(--radius); padding: 1.25rem; display: grid; gap: .9rem; align-content: start; min-height: 420px; }
.results__head { font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: .06em; opacity: .8; margin: 0; }
.kpis { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin: 0; }
.kpi { background: rgba(255,255,255,.08); border-radius: var(--radius-sm); padding: .75rem; }
.kpi dt { font-size: .78rem; opacity: .8; }
.kpi dd { margin: .15rem 0 0; font-size: 1.45rem; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1.15; }
.kpi dd small { font-size: .8rem; font-weight: 500; opacity: .8; }
.kpi--wide { grid-column: 1 / -1; }
.reco { background: var(--c-green-600); border-radius: var(--radius-sm); padding: .85rem; min-height: 150px; }
@media (min-width: 768px) { .reco { min-height: 140px; } }
.reco__label { font-size: .78rem; opacity: .9; text-transform: uppercase; letter-spacing: .05em; }
.reco__title { font-size: 1.15rem; font-weight: 800; margin: .1rem 0 .25rem; }
.reco__text { font-size: var(--fs-sm); margin: 0; opacity: .95; }
.results__note { font-size: .75rem; opacity: .75; margin: 0; }

/* ---------- 9. Artículos ---------- */
.breadcrumbs { font-size: var(--fs-sm); color: var(--c-muted); margin: 0 0 .75rem; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: .25rem; padding: 0; margin: 0; }
.breadcrumbs li + li::before { content: "›"; margin-right: .25rem; color: var(--c-border); }
.article { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 1.25rem; }
@media (min-width: 768px) { .article { padding: 2rem 2.25rem; } }
.article__meta { font-size: var(--fs-sm); color: var(--c-muted); margin-bottom: 1rem; }
.article__body > * { max-width: var(--measure); }
.article__body > .table-wrap { max-width: none; }
.table td:nth-child(2) { white-space: normal; }
.article__body li { margin-bottom: .35rem; }
.toc { background: var(--c-blue-50); border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 1rem 1.25rem; }
.toc__title { font-weight: 700; margin: 0 0 .4rem; color: var(--c-blue-900); }
.toc ol { margin: 0; padding-left: 1.2rem; }
.callout { border-left: 4px solid var(--c-green-600); background: var(--c-green-100); padding: .85rem 1rem; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.callout--warn { border-color: var(--c-amber-600); background: #fff6e5; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1em; }
.table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); background: #fff; }
.table th, .table td { padding: .55rem .7rem; border-bottom: 1px solid var(--c-border); text-align: left; white-space: nowrap; }
.table th { background: var(--c-blue-50); color: var(--c-blue-900); }
.table td:first-child { white-space: normal; min-width: 11rem; }
.table td.num, .table th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- 10. FAQ ---------- */
.faq details { border: 1px solid var(--c-border); background: #fff; border-radius: var(--radius-sm); padding: .25rem 1rem; margin-bottom: .5rem; }
.faq summary { cursor: pointer; font-weight: 600; padding: .65rem 0; color: var(--c-blue-900); list-style-position: outside; }
.faq details[open] summary { border-bottom: 1px solid var(--c-border); margin-bottom: .5rem; }

/* ---------- 12. Footer ---------- */
.site-footer { background: #0a2a40; color: #b9cfe0; font-size: var(--fs-sm); padding-block: 2rem; }
.site-footer a { color: #e3eef7; }
.footer__grid { display: grid; gap: 1.25rem; }
@media (min-width: 768px) { .footer__grid { grid-template-columns: 2fr 1fr 1fr; } }
.footer__title { color: #fff; font-weight: 700; margin: 0 0 .5rem; }
.footer__list { list-style: none; padding: 0; margin: 0; display: grid; gap: .35rem; }
.footer__legal { border-top: 1px solid rgba(255,255,255,.12); margin-top: 1.5rem; padding-top: 1rem; }

/* ---------- 13. Preferencias de movimiento ---------- */
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; } }

/* Llista de guies a la home */
.guide-list { margin: 0; padding-left: 1.1rem; display: grid; gap: .45rem; }

/* Comparador de calefacción: barras (transform → sin reflujo ni CLS) */
.cmp-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .7rem; }
.cmp-row { display: grid; grid-template-columns: 1fr auto; gap: .2rem .75rem; align-items: baseline; }
.cmp-row__name { font-weight: 600; font-size: var(--fs-sm); }
.cmp-row__eur { font-weight: 800; font-size: 1.15rem; font-variant-numeric: tabular-nums; text-align: right; }
.cmp-row__track { grid-column: 1 / -1; height: 10px; border-radius: 99px; background: rgba(255,255,255,.12); overflow: hidden; }
.cmp-row__bar { height: 100%; width: 100%; border-radius: 99px; background: #7fb8e6; transform-origin: left center; transform: scaleX(.5); transition: transform .25s ease; }
.cmp-row__kwh { grid-column: 1 / -1; font-size: .75rem; opacity: .75; }
.cmp-row--best .cmp-row__bar { background: #3ccf8e; }
.cmp-row--best .cmp-row__name::after { content: " · más barato"; color: #9fe3c0; font-weight: 700; }