/* ============================================
   Sistema de diseño de marca — Concentradores de
   Oxígeno (Querétaro / Toluca). Paleta corporativa
   fija: no se usan colores fuera de esta paleta,
   salvo neutros (blancos y grises).
   ============================================ */

:root {
  --color-primary: #39B4C7;
  --color-primary-dark: #2EA7BB;

  --color-secondary: #215079;
  --color-secondary-dark: #193F60;

  --color-success: #419E4A;
  --color-success-light: #9AC2AC;

  --color-background: #F2F5F3;
  --color-surface: #FFFFFF;

  --color-text: #215079;
  --color-text-secondary: #1E3735;

  --border-radius: 16px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,.08);
  --shadow-md: 0 6px 20px rgba(0,0,0,.12);

  /* Tokens derivados de la misma paleta (tintes suaves) + neutros de apoyo */
  --color-primary-soft: #E4F4F6;
  --color-complementary-soft: #EAF3EE;
  --color-border: #E1E6E3;
  --color-text-muted: #74807B;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.contenedor {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

section { padding: 4.5rem 0; }
@media (max-width: 700px) { section { padding: 3rem 0; } }

.etiqueta {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-secondary);
  background: var(--color-complementary-soft);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 0.9rem;
}

.titulo-seccion {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.subtitulo-seccion {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.centrado { text-align: center; margin-left: auto; margin-right: auto; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.98rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primario { background: var(--color-primary); color: white; box-shadow: var(--shadow-sm); }
.btn-primario:hover { background: var(--color-primary-dark); }
.btn-secundario { background: var(--color-secondary); color: white; }
.btn-secundario:hover { background: var(--color-secondary-dark); }
.btn-exito { background: var(--color-success); color: white; }
.btn-exito:hover { filter: brightness(0.92); }
.btn svg { width: 20px; height: 20px; flex-shrink: 0; }

/* ---------- Barra superior de contacto ---------- */
.topbar {
  background: var(--color-secondary);
  color: #DCEBFB;
  font-size: 0.82rem;
}
.topbar .contenedor {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.topbar a { display: inline-flex; align-items: center; gap: 0.35rem; }
.topbar a:hover { color: white; }

/* ---------- Header ---------- */
header.principal {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-secondary);
}
.logo-imagen {
  height: 156px;
  width: auto;
}
@media (max-width: 500px) {
  .logo-imagen { height: 126px; }
}

.logo .icono-logo {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 1.3rem;
}
.logo small { display: block; font-size: 0.68rem; font-weight: 600; color: var(--color-text-muted); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  font-weight: 600;
  font-size: 0.95rem;
}
.nav-links a { color: var(--color-text-secondary); }
.nav-links a:hover { color: var(--color-primary); }

.nav-cta { display: flex; align-items: center; gap: 0.8rem; }
.nav-tel {
  font-weight: 700;
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--color-secondary);
  cursor: pointer;
}

@media (max-width: 880px) {
  .nav-links { display: none; }
  .menu-toggle { display: block; }
  .nav-tel span { display: none; }
}

.nav-links.abierto {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  background: var(--color-surface);
  padding: 1.2rem;
  box-shadow: var(--shadow-md);
  gap: 1rem;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--color-primary-soft) 0%, var(--color-background) 100%);
  padding: 3.5rem 0 4rem;
}
.hero .contenedor {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
@media (max-width: 880px) {
  .hero .contenedor { grid-template-columns: 1fr; }
}
.hero h1 {
  font-size: clamp(2rem, 4.2vw, 2.9rem);
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 1.1rem;
}
.hero h1 span { color: var(--color-primary); }
.hero p.lead {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.8rem;
  max-width: 540px;
}
.hero-botones { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-bottom: 2rem; }
.hero-confianza {
  display: flex;
  gap: 1.6rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 600;
}
.hero-confianza span { display: flex; align-items: center; gap: 0.4rem; }
.hero-confianza svg { width: 18px; height: 18px; color: var(--color-success); }

.hero-visual {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual img { max-height: 460px; object-fit: contain; border-radius: 10px; }
.hero-badge {
  position: absolute;
  bottom: -18px;
  left: 24px;
  background: var(--color-success);
  color: white;
  padding: 0.7rem 1.2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.85rem;
  box-shadow: var(--shadow-sm);
}

/* ---------- Tira de confianza ---------- */
.tira-confianza {
  background: var(--color-success-light);
  padding: 1.6rem 0;
}
.tira-confianza .contenedor {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  text-align: center;
  color: var(--color-secondary);
}
@media (max-width: 700px) { .tira-confianza .contenedor { grid-template-columns: repeat(2, 1fr); } }
.tira-confianza .item { display: flex; flex-direction: column; align-items: center; gap: 0.4rem; }
.tira-confianza svg { width: 26px; height: 26px; color: var(--color-secondary); }
.tira-confianza .item span { font-size: 0.85rem; font-weight: 600; }

/* ---------- Servicios / categorías ---------- */
.grid-servicios {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) { .grid-servicios { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-servicios { grid-template-columns: 1fr; } }

.card-servicio {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.8rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card-servicio:hover { box-shadow: var(--shadow-sm); transform: translateY(-4px); }
.card-servicio .icono {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.card-servicio .icono img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}
.card-servicio h3 { font-size: 1.08rem; font-weight: 700; color: var(--color-secondary); margin-bottom: 0.5rem; }
.card-servicio p { color: var(--color-text-secondary); font-size: 0.92rem; }

/* ---------- Productos ---------- */
.grid-productos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}
.card-producto {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}
.card-producto .foto {
  height: 220px;
  background: var(--color-background);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}
.card-producto .foto img { max-height: 100%; object-fit: contain; }
.card-producto .cuerpo { padding: 1.3rem; display: flex; flex-direction: column; flex: 1; }
.card-producto .tag {
  align-self: flex-start;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  color: var(--color-primary-dark);
  background: var(--color-primary-soft);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.6rem;
}
.card-producto h3 { font-size: 1.05rem; font-weight: 700; color: var(--color-secondary); margin-bottom: 0.4rem; }
.card-producto p.desc { color: var(--color-text-secondary); font-size: 0.88rem; flex: 1; margin-bottom: 1rem; }
.card-producto .precio-fila {
  display: flex; align-items: baseline; justify-content: space-between;
  border-top: 1px solid var(--color-border); padding-top: 0.9rem;
}
.card-producto .precio { font-size: 1.15rem; font-weight: 700; color: var(--color-primary-dark); }
.card-producto .precio small { display: block; font-weight: 500; color: var(--color-text-muted); font-size: 0.68rem; }
.estado-productos { grid-column: 1 / -1; text-align: center; color: var(--color-text-muted); padding: 2rem 0; }

/* ---------- Tabla de precios de renta ---------- */
.tablas-precio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}
@media (max-width: 900px) { .tablas-precio { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .tablas-precio { grid-template-columns: 1fr; } }
.tabla-precio {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.tabla-precio .encabezado {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  padding: 1.3rem 1.5rem;
}
.tabla-precio .encabezado h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.2rem; }
.tabla-precio .encabezado p { font-size: 0.82rem; color: #DCEEF1; }
.tabla-precio .filas { padding: 0.5rem 1.5rem; }
.tabla-precio .fila {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.9rem 0; border-bottom: 1px solid var(--color-border);
}
.tabla-precio .fila:last-child { border-bottom: none; }
.tabla-precio .fila .periodo { color: var(--color-text-secondary); font-weight: 600; }
.tabla-precio .fila .monto { font-weight: 700; color: var(--color-secondary); font-size: 1.05rem; }
.tabla-precio .incluye {
  background: var(--color-background);
  padding: 1rem 1.5rem;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}
.tabla-precio .incluye strong { color: var(--color-text); }

/* ---------- Por qué elegirnos ---------- */
.grid-diferenciadores {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem 2rem;
}
@media (max-width: 700px) { .grid-diferenciadores { grid-template-columns: 1fr; } }
.diferenciador { display: flex; gap: 1rem; align-items: flex-start; }
.diferenciador .num {
  flex-shrink: 0;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--color-success);
  color: white;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
}
.diferenciador h3 { color: var(--color-secondary); font-weight: 700; margin-bottom: 0.3rem; font-size: 1rem; }
.diferenciador p { color: var(--color-text-secondary); font-size: 0.9rem; }

.franja-cita {
  background: var(--color-complementary-soft);
}
.cita {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.cita p {
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 700;
  color: var(--color-secondary);
  font-style: italic;
}

/* ---------- Cobertura ---------- */
.cobertura-lista {
  display: flex; flex-wrap: wrap; gap: 0.7rem; margin-bottom: 1.5rem;
}
.chip-ciudad {
  background: var(--color-complementary-soft);
  color: var(--color-secondary);
  font-weight: 700;
  font-size: 0.88rem;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
}
.chip-ciudad.proxima {
  background: transparent;
  border: 1.5px dashed var(--color-secondary);
  color: var(--color-secondary);
}

/* ---------- FAQ ---------- */
.faq-item {
  border-bottom: 1px solid var(--color-border);
}
.faq-pregunta {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.2rem 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.faq-pregunta .mas { font-size: 1.4rem; color: var(--color-primary); transition: transform 0.2s ease; }
.faq-item.abierto .faq-pregunta .mas { transform: rotate(45deg); }
.faq-respuesta {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
}
.faq-item.abierto .faq-respuesta { max-height: 700px; }
.faq-respuesta p { padding-bottom: 1.2rem; }
.faq-respuesta ul { list-style: disc; padding-left: 1.2rem; margin-bottom: 1rem; }
.faq-respuesta li { margin-bottom: 0.4rem; }

/* ---------- CTA final ---------- */
.cta-final {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  text-align: center;
}
.cta-final h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 700; margin-bottom: 0.8rem; }
.cta-final p { color: #EAF9FB; margin-bottom: 1.8rem; font-size: 1.05rem; }
.cta-final .btn-secundario { background: var(--color-secondary); }
.cta-final .btn-secundario:hover { background: var(--color-secondary-dark); }

/* ---------- Footer ---------- */
footer {
  background: var(--color-secondary);
  color: #C7D8E4;
  padding: 3rem 0 1.5rem;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2rem;
}
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; gap: 2rem; } }
footer h4 { color: white; font-weight: 700; font-size: 1rem; margin-bottom: 1rem; }
footer ul li { margin-bottom: 0.6rem; }
footer a:hover { color: white; }
.footer-logo { display: flex; align-items: center; gap: 0.6rem; color: white; font-weight: 700; margin-bottom: 0.8rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 1.3rem;
  text-align: center;
  font-size: 0.8rem;
  color: #9DB9CB;
}

/* ---------- Botón flotante de WhatsApp ---------- */
.whatsapp-flotante {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.3rem;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  transition: transform 0.15s ease, background 0.15s ease;
}
.whatsapp-flotante:hover { background: var(--color-primary-dark); transform: scale(1.05); }
.whatsapp-flotante svg { width: 22px; height: 22px; }

.badge-agotado {
  display: inline-block;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-text-secondary);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-weight: 700;
  font-size: 0.72rem;
}