.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: height var(--dur-base) var(--ease-elegant),
              background-color var(--dur-base) var(--ease-elegant),
              border-color var(--dur-base) var(--ease-elegant);
}

.site-header.is-scrolled {
  height: var(--header-h-scrolled);
  background: var(--color-black-a85);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--color-white-a08);
}

.site-header__inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.site-header__logo {
  display: flex;
  align-items: center;
  height: 92px;
  flex-shrink: 0;
  transition: height var(--dur-base) var(--ease-elegant);
}
.is-scrolled .site-header__logo {
  height: 68px;
}
.site-header__logo picture {
  display: contents;
}
.site-header__logo img {
  /* Se reserva ~20% de espacio de seguridad vertical dentro del propio
     bloque del logo (en vez de 100%) para que el símbolo respire y no
     quede pegado a la línea del header ni a los elementos vecinos. */
  height: 80%;
  width: auto;
  object-fit: contain;
}

@media (max-width: 900px) {
  .site-header__logo { height: 56px; }
  .is-scrolled .site-header__logo { height: 48px; }
}

@media (max-width: 560px) {
  .site-header__logo { height: 46px; }
  .is-scrolled .site-header__logo { height: 40px; }
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: nowrap;
}

.site-header__nav a {
  white-space: nowrap;
}

.site-header__nav a {
  font-family: var(--font-body);
  font-size: var(--fs-body-sm);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-white);
  position: relative;
  padding-bottom: 6px;
  transition: color var(--dur-fast) var(--ease-elegant);
}
.site-header__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--dur-fast) var(--ease-elegant);
}
.site-header__nav a:hover {
  color: var(--color-gold-light);
}
.site-header__nav a:hover::after {
  width: 100%;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-header__cta {
  padding: 0.75rem 1.5rem;
}

.site-header__burger {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.site-header__burger span {
  position: relative;
  display: block;
  width: 22px;
  height: 1px;
  background: var(--color-white);
  transition: transform var(--dur-fast) var(--ease-elegant), opacity var(--dur-fast) var(--ease-elegant);
}
.site-header__burger span::before,
.site-header__burger span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 1px;
  background: var(--color-white);
  transition: transform var(--dur-fast) var(--ease-elegant), top var(--dur-fast) var(--ease-elegant);
}
.site-header__burger span::before { top: -7px; }
.site-header__burger span::after { top: 7px; }

.site-header__burger[aria-expanded="true"] span { background: transparent; }
.site-header__burger[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
  background: var(--color-gold);
}
.site-header__burger[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
  background: var(--color-gold);
}

/* Menú móvil */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--color-black);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 var(--space-container-x);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-base) var(--ease-elegant),
              transform var(--dur-base) var(--ease-elegant),
              visibility 0s;
}
.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  margin-bottom: 3rem;
}
.mobile-nav__list a {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 2.75rem);
  color: var(--color-white);
  font-weight: 500;
}
.mobile-nav__list a:hover { color: var(--color-gold); }
.mobile-nav .btn { width: fit-content; }

/* El punto de corte entre navegación desktop y menú móvil se sitúa en
   1300px (en vez de 900px): por debajo de ese ancho, la navegación
   desktop + el botón "Solicitar presupuesto" no caben en una sola
   línea sin envolver, y al no envolver (nowrap) quedaban cortados o
   fuera de pantalla entre ~902px y ~1290px. El menú móvil existente
   ya cubre correctamente todo ese rango, así que simplemente se activa
   antes. No se ha modificado el diseño, la tipografía ni el propio
   menú móvil. */
@media (max-width: 1300px) {
  .site-header__nav { display: none; }
  .site-header__cta.btn { display: none; }
  .site-header__burger { display: flex; }
}