/* Horequip Airpure — hoja de estilos única
   Diseño sobrio: fondo claro, un azul corporativo, sin animaciones. */

:root {
  --navy: #0b2236;
  --navy-2: #13324d;
  --blue: #0d5c8c;
  --blue-dark: #0a4a72;
  --blue-soft: #e8f1f7;
  --text: #1d2a35;
  --muted: #5b6b78;
  --line: #dfe5ea;
  --bg-alt: #f4f6f8;
  --white: #fff;
  --radius: 4px;
  --wrap: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--white);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); text-decoration: underline; }
h1, h2, h3, h4 { color: var(--navy); line-height: 1.25; margin: 0 0 .6em; font-weight: 700; }
h1 { font-size: clamp(1.9rem, 3.4vw, 2.75rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.5rem, 2.4vw, 2rem); letter-spacing: -.005em; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
li { margin-bottom: .3em; }
strong { color: var(--navy); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--white); padding: 8px 12px; z-index: 100; }

/* ---------- Barra superior ---------- */
.topbar { background: var(--navy); color: #c9d6e1; font-size: .85rem; }
.topbar .wrap { display: flex; justify-content: space-between; align-items: center; min-height: 38px; gap: 16px; }
.topbar a { color: #fff; }
.topbar-contact { display: flex; gap: 22px; }
.topbar-contact span { white-space: nowrap; }

/* ---------- Cabecera ---------- */
.header { background: var(--white); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; }
.header .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 78px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 16px; color: var(--navy); }
.brand:hover { text-decoration: none; color: var(--navy); }
.brand-logo { display: block; flex: none; width: 131px; height: 48px; }
.brand-tag { display: block; font-size: .72rem; line-height: 1.35; color: var(--muted); letter-spacing: .02em; padding-left: 16px; border-left: 1px solid var(--line); }

.nav ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 4px; }
.nav li { margin: 0; }
.nav a { display: block; padding: 10px 12px; color: var(--navy); font-weight: 600; font-size: .95rem; border-bottom: 2px solid transparent; }
.nav a:hover { text-decoration: none; color: var(--blue); }
.nav a[aria-current="page"] { color: var(--blue); border-bottom-color: var(--blue); }
.nav .nav-cta a { background: var(--blue); color: #fff; border-radius: var(--radius); padding: 10px 18px; margin-left: 8px; border: 0; }
.nav .nav-cta a:hover { background: var(--blue-dark); color: #fff; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 12px; font: inherit; font-weight: 600; color: var(--navy); cursor: pointer; }

/* ---------- Portada ---------- */
.hero { position: relative; background: var(--navy); color: #fff; overflow: hidden; }
.hero-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .38; }
.hero .wrap { position: relative; padding-top: 96px; padding-bottom: 96px; }
.hero-text { max-width: 640px; }
.hero h1 { color: #fff; }
.hero p { font-size: 1.15rem; color: #dbe5ee; }
.eyebrow { display: block; font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--blue); margin-bottom: 12px; }
.hero .eyebrow { color: #8ec5e8; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.btn { display: inline-block; padding: 13px 24px; border-radius: var(--radius); font-weight: 600; border: 1px solid transparent; font-size: 1rem; line-height: 1.2; cursor: pointer; font-family: inherit; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); color: #fff; }
.btn-light { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .6); }
.btn-light:hover { background: rgba(255, 255, 255, .1); color: #fff; }
.btn-outline { background: #fff; color: var(--blue); border-color: var(--blue); }
.btn-outline:hover { background: var(--blue-soft); color: var(--blue-dark); }

/* Cifras */
.facts { border-bottom: 1px solid var(--line); }
.facts ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); }
.facts li { padding: 28px 24px; margin: 0; border-left: 1px solid var(--line); }
.facts li:first-child { border-left: 0; padding-left: 0; }
.facts strong { display: block; font-size: 1.6rem; color: var(--navy); line-height: 1.2; }
.facts span { color: var(--muted); font-size: .92rem; }

/* ---------- Secciones ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head p { color: var(--muted); font-size: 1.05rem; }
.lead { font-size: 1.12rem; color: var(--muted); }

/* Cabecera de página interior */
.page-head { background: var(--bg-alt); border-bottom: 1px solid var(--line); padding: 44px 0 40px; }
.page-head h1 { margin-bottom: .3em; }
.page-head p { color: var(--muted); font-size: 1.1rem; max-width: 760px; margin: 0; }
.crumbs { font-size: .85rem; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.crumbs span { margin: 0 6px; }

/* Rejillas de tarjetas */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); display: flex; flex-direction: column; color: var(--text); }
a.card:hover { text-decoration: none; border-color: #b8c6d2; color: var(--text); }
a.card:hover h3 { color: var(--blue); }
.card-img { aspect-ratio: 3 / 2; width: 100%; object-fit: cover; border-bottom: 1px solid var(--line); border-radius: var(--radius) var(--radius) 0 0; }
.card-img.contain { object-fit: contain; background: #fff; padding: 16px; }
.card-body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.card-body h3 { margin-bottom: .4em; }
.card-body p { color: var(--muted); font-size: .95rem; margin-bottom: .8em; }
.card-body ul { color: var(--muted); font-size: .93rem; padding-left: 1.1em; margin-bottom: 0; }
.more { margin-top: auto; font-weight: 600; color: var(--blue); font-size: .95rem; }

/* Texto + imagen */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split.top { align-items: start; }
.split > *, .product > *, .grid > * { min-width: 0; }
.split-img img { border-radius: var(--radius); border: 1px solid var(--line); width: 100%; }

/* Listas con marca */
.checks { list-style: none; padding: 0; }
.checks li { position: relative; padding-left: 26px; }
.checks li::before { content: ""; position: absolute; left: 2px; top: .55em; width: 12px; height: 7px; border-left: 2px solid var(--blue); border-bottom: 2px solid var(--blue); transform: rotate(-45deg); }
.cols-2 { columns: 2; column-gap: 40px; }
.cols-2 li { break-inside: avoid; }
.cols-3 { columns: 3; column-gap: 32px; }
.cols-3 li { break-inside: avoid; }

/* Pasos numerados */
.steps { counter-reset: paso; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.steps li { counter-increment: paso; border-top: 2px solid var(--blue); padding-top: 18px; margin: 0; }
.steps li::before { content: counter(paso, decimal-leading-zero); display: block; font-weight: 700; color: var(--blue); margin-bottom: 6px; }
.steps h3 { font-size: 1.05rem; margin-bottom: .3em; }
.steps p { color: var(--muted); font-size: .95rem; margin: 0; }

/* Tablas */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 1.5em; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; background: #fff; }
th, td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--bg-alt); color: var(--navy); font-weight: 700; white-space: nowrap; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
tbody th { color: var(--navy); font-weight: 600; width: 34%; }
.table-compare td:nth-child(2) { background: var(--blue-soft); }

/* Fichas de producto */
.product { display: grid; grid-template-columns: 340px 1fr; gap: 48px; padding: 56px 0; border-top: 1px solid var(--line); scroll-margin-top: 100px; }
.product:first-of-type { border-top: 0; padding-top: 8px; }
.product-media img { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; width: 100%; aspect-ratio: 1 / 1; object-fit: contain; padding: 12px; }
.product-media .cover { object-fit: cover; padding: 0; }
.product h2 { margin-bottom: .2em; }
.product .sub { color: var(--blue); font-weight: 600; margin-bottom: 1em; }
.product h3 { font-size: 1rem; margin-top: 1.6em; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0 0 1em; }
.tags li { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 3px; padding: 3px 10px; font-size: .85rem; margin: 0; color: var(--navy); }
.pdf { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; }
.pdf::before { content: "PDF"; font-size: .68rem; font-weight: 700; color: #fff; background: #b3261e; border-radius: 2px; padding: 2px 5px; letter-spacing: .04em; }

/* Índice lateral dentro de una familia */
.subnav { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 79px; z-index: 40; }
.subnav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.subnav ul::-webkit-scrollbar { display: none; }
.subnav li { margin: 0; flex: none; }
.subnav a { display: block; padding: 14px 12px; font-size: .9rem; font-weight: 600; color: var(--muted); white-space: nowrap; }
.subnav a:hover { color: var(--blue); text-decoration: none; }

/* Bloques destacados */
.note { border-left: 3px solid var(--blue); background: var(--blue-soft); padding: 16px 20px; border-radius: 0 var(--radius) var(--radius) 0; color: var(--navy); }
.note p:last-child { margin-bottom: 0; }
.panel { border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; background: #fff; }
.panel h3 { margin-bottom: .5em; }

/* Listado de documentos */
.docs { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.docs li { display: flex; justify-content: space-between; gap: 20px; align-items: baseline; padding: 14px 0; border-bottom: 1px solid var(--line); margin: 0; }
.docs .doc-src { color: var(--muted); font-size: .88rem; display: block; }
.docs .doc-req { color: var(--muted); font-size: .88rem; white-space: nowrap; }

/* Referencias */
.refs { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.refs li { margin: 0; padding: 16px 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: .9rem; color: var(--navy); font-weight: 600; background: #fff; }

/* Preguntas frecuentes */
.faq details { border-bottom: 1px solid var(--line); }
.faq details:first-child { border-top: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 20px 40px 20px 0; font-weight: 600; color: var(--navy); font-size: 1.05rem; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 6px; top: 16px; font-size: 1.4rem; font-weight: 400; color: var(--blue); }
.faq details[open] summary::after { content: "−"; }
.faq .answer { padding: 0 0 20px; color: var(--text); max-width: 820px; }

/* Llamada a la acción */
.cta { background: var(--navy); color: #dbe5ee; padding: 64px 0; }
.cta .wrap { display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.cta h2 { color: #fff; margin-bottom: .3em; }
.cta p { margin: 0; max-width: 640px; }
.cta-phone { color: #fff; font-size: 1.35rem; font-weight: 700; white-space: nowrap; }
.cta-phone:hover { color: #fff; }
.cta-side { display: flex; flex-direction: column; align-items: flex-end; gap: 12px; flex: none; }

/* Formularios */
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; }
.form .full { grid-column: 1 / -1; }
.form label { display: block; font-weight: 600; color: var(--navy); font-size: .92rem; margin-bottom: 6px; }
.form input, .form textarea, .form select { width: 100%; font: inherit; color: var(--text); border: 1px solid #c4cfd8; border-radius: var(--radius); padding: 11px 13px; background: #fff; }
.form input:focus, .form textarea:focus, .form select:focus { outline: 2px solid var(--blue); outline-offset: 0; border-color: var(--blue); }
.form textarea { min-height: 150px; resize: vertical; }
.form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; font-size: .9rem; color: var(--muted); }
.form .check input { width: auto; margin-top: 4px; }
.form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.req { color: #b3261e; }
.alert { padding: 14px 18px; border-radius: var(--radius); margin-bottom: 24px; }
.alert-ok { background: #e7f4ec; border: 1px solid #a9d5b8; color: #1d5b33; }
.alert-err { background: #fbeceb; border: 1px solid #ecb7b3; color: #8a1f17; }
.contact-data { list-style: none; padding: 0; margin: 0; }
.contact-data li { padding: 16px 0; border-bottom: 1px solid var(--line); margin: 0; }
.contact-data li:first-child { padding-top: 0; }
.contact-data span { display: block; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; margin-bottom: 2px; }
.contact-data a, .contact-data strong { font-size: 1.05rem; }

/* ---------- Pie ---------- */
.footer { background: #08192a; color: #9fb1c1; font-size: .92rem; padding: 64px 0 0; }
.footer a { color: #d5e0ea; }
.footer h4 { color: #fff; font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 8px; }
.footer .brand { display: inline-flex; margin-bottom: 18px; background: #fff; padding: 8px 12px; border-radius: 4px; }
.footer address { font-style: normal; }
.footer-bottom { border-top: 1px solid #1d3349; padding: 20px 0; font-size: .82rem; }
.footer-bottom .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-bottom ul { display: flex; gap: 18px; }
.footer-bottom li { margin: 0; }

/* ---------- Adaptación a pantallas ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: #fff; border-bottom: 1px solid var(--line); }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; align-items: stretch; padding: 8px 24px 20px; gap: 0; }
  .nav a { padding: 13px 0; border-bottom: 1px solid var(--line); }
  .nav a[aria-current="page"] { border-bottom-color: var(--line); }
  .nav .nav-cta a { margin: 14px 0 0; text-align: center; }
  .header .wrap { position: static; }
  .header { position: sticky; }
  .subnav { top: 78px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .refs { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split, .product { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .product-media { max-width: 420px; }
  .facts ul { grid-template-columns: repeat(2, 1fr); }
  .facts li { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
  .facts li:nth-child(-n+2) { border-top: 0; }
  .cta .wrap { flex-direction: column; align-items: flex-start; }
  .cta-side { align-items: flex-start; }
  .cols-3 { columns: 2; }
  .refs { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .topbar .tb-hide { display: none; }
  .topbar-contact { gap: 14px; }
  .section { padding: 56px 0; }
  .hero .wrap { padding-top: 64px; padding-bottom: 64px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .cols-2, .cols-3 { columns: 1; }
  .steps { grid-template-columns: 1fr; }
  .form { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .docs li { flex-direction: column; gap: 4px; }
  .brand-tag { display: none; }
  th, td { padding: 9px 12px; }
}