/* ============================================================
   ESTÁNDAR INGENIEROS — Header / Navigation
   ============================================================ */

/* ── Header Base ───────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--color-bg-header);
  height: var(--header-height-mobile);
  display: flex;
  align-items: center;
  transition: box-shadow var(--transition-base), background var(--transition-base);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.site-header.is-scrolled {
  box-shadow: 0 2px 24px rgba(0,0,0,0.25);
  background: rgba(42,42,41,0.97);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  height: 100%;
}

/* ── Logo ──────────────────────────────────────────────────── */
.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__img {
  height: 52px;
  width: auto;
  object-fit: contain;
  display: block;
}

/* ── Desktop Navigation ────────────────────────────────────── */
.site-nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: rgba(255,255,255,0.80);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.site-nav__link:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.08);
}

.site-nav__link.is-active {
  color: var(--color-orange);
  font-weight: var(--weight-semibold);
}

.site-nav__link.is-active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: var(--space-3);
  right: var(--space-3);
  height: 2px;
  background: var(--color-orange);
  border-radius: var(--radius-full);
}

/* ── Header CTA Area ───────────────────────────────────────── */
.site-header__cta {
  display: none;
  align-items: center;
  gap: var(--space-3);
}

.site-header__phone {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.site-header__phone:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.08);
}

.site-header__phone svg {
  width: 16px;
  height: 16px;
  fill: var(--color-orange);
  flex-shrink: 0;
}

/* ── Mobile Menu Button ────────────────────────────────────── */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.menu-toggle:hover {
  background: rgba(255,255,255,0.14);
}

.menu-toggle[aria-expanded="true"] {
  background: rgba(243,146,0,0.15);
  border-color: rgba(243,146,0,0.3);
}

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 22px;
  height: 22px;
}

.hamburger__line {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--color-white);
  transition: all var(--transition-base);
  transform-origin: center;
}

.menu-toggle[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Drawer ─────────────────────────────────────────── */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: calc(var(--z-sticky) - 1);
  background: var(--color-bg-header);
  padding: var(--space-6) var(--container-pad);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.mobile-menu.is-open {
  display: block;
  transform: translateX(0);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.is-active {
  color: var(--color-orange);
  padding-left: var(--space-2);
}

.mobile-nav__cta {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-nav__contact {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.mobile-nav__phone {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  margin-bottom: var(--space-4);
  transition: color var(--transition-fast);
}

.mobile-nav__phone:hover {
  color: var(--color-white);
}

.mobile-nav__phone svg {
  width: 18px;
  height: 18px;
  fill: var(--color-orange);
}

/* ── Responsive breakpoints ────────────────────────────────── */
@media (min-width: 1024px) {
  .site-header {
    height: var(--header-height-desktop);
  }

  .site-logo__img {
    height: 60px;
  }

  .site-nav {
    display: flex;
  }

  .site-header__cta {
    display: flex;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-menu {
    display: none !important;
  }
}

/* ── Page body offset (sticky header) ─────────────────────── */
.page-body {
  padding-top: var(--header-height-mobile);
}

@media (min-width: 1024px) {
  .page-body {
    padding-top: var(--header-height-desktop);
  }
}