/* ==========================================================================
   LAYOUT: contenedores, grillas, secciones, header y footer
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}
.container--narrow { max-width: 860px; }

.grid { display: grid; gap: 1.25rem; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.center { text-align: center; margin-top: 2.5rem; }

/* --- Secciones --- */
.section { padding-block: var(--space-section); position: relative; }
.section--tint { background: var(--c-tint); }
.section--dark { background: var(--g-dark); color: #dbe6f3; }
.section--dark h2, .section--dark h3 { color: #fff; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 3rem; }
.section-head p { color: var(--c-muted); font-size: var(--fs-md); }
.section-head--light p { color: #a9bbd1; }
.section-head--left { text-align: left; margin-left: 0; }

/* --- Header --- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 100;
  height: var(--header-h);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(11, 26, 51, .92);
  backdrop-filter: saturate(160%) blur(10px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, .18);
}
.site-header__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }

.brand { display: flex; align-items: center; gap: .65rem; color: #fff; }
.brand img { border-radius: 50%; background: #fff; padding: 2px; }
.brand__name { font-family: var(--f-head); font-weight: 600; letter-spacing: .14em; font-size: 1rem; }

.main-nav { display: flex; align-items: center; gap: 1.75rem; margin-left: auto; }
.main-nav a:not(.btn) { color: #cfdcec; font-size: var(--fs-sm); font-weight: 500; transition: color .2s; }
.main-nav a:not(.btn):hover { color: #fff; }

/* Botón WhatsApp (esquina superior derecha) */
.wa-btn {
  width: 42px; height: 42px; flex-shrink: 0; border-radius: 50%;
  display: grid; place-items: center; background: #25d366; color: #fff;
  box-shadow: 0 6px 18px rgba(37, 211, 102, .35);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.wa-btn:hover { transform: scale(1.08); box-shadow: 0 8px 24px rgba(37, 211, 102, .5); }
.wa-btn__icon { width: 24px; height: 24px; fill: currentColor; }

.nav-toggle {
  display: none; background: none; border: 0; color: #fff; padding: .5rem; cursor: pointer;
}
.nav-toggle .icon { width: 28px; height: 28px; }

/* --- Footer --- */
.site-footer { background: var(--c-navy-950); color: #9fb1c8; padding: 2.5rem 0 2rem; font-size: var(--fs-sm); }
.site-footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem; }
.site-footer__brand { display: flex; align-items: center; gap: .85rem; }
.site-footer__brand img { border-radius: 50%; background: #fff; padding: 2px; }
.site-footer__brand strong { display: block; color: #fff; font-family: var(--f-head); letter-spacing: .12em; }
.site-footer__links { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.site-footer__links a { color: #cfdcec; display: inline-flex; align-items: center; gap: .4rem; }
.site-footer__links a:hover { color: var(--c-cyan); }
.site-footer__copy { width: 100%; margin: 1rem 0 0; padding-top: 1.25rem; border-top: 1px solid rgba(255,255,255,.08); }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }
  .wa-btn { margin-left: auto; } /* el menú sale del flujo: WhatsApp queda a la derecha */
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--c-navy-900); padding: .5rem 1rem 1.25rem;
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%); transition: transform .35s var(--ease);
  }
  .main-nav.is-open { transform: none; }
  .main-nav a:not(.btn) { padding: .9rem .25rem; border-bottom: 1px solid rgba(255,255,255,.08); font-size: var(--fs-md); }
  .main-nav .btn { margin-top: 1rem; }
  .site-header:has(.main-nav.is-open) { background: var(--c-navy-900); }
}

@media (max-width: 600px) {
  .grid--2, .grid--4 { grid-template-columns: 1fr; }
  .section-head { margin-bottom: 2rem; }
  .site-footer { padding-bottom: 6rem; } /* espacio para la barra CTA móvil */
}