/* ============================================================
   NAVEGACIÓN — Sticky + Mobile Hamburger
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background-color: rgba(249, 245, 238, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

.site-header.scrolled {
  background-color: rgba(249, 245, 238, 0.97);
  border-bottom-color: var(--color-sage);
  box-shadow: 0 2px 20px rgba(45, 90, 39, 0.08);
}

/* ---- Layout ---- */
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: var(--spacing-md);
}

/* ---- Logo ---- */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-verde-oscuro);
  letter-spacing: -0.02em;
}

.logo-tagline {
  font-size: 0.7rem;
  color: var(--color-verde-medio);
  font-style: italic;
  letter-spacing: 0.03em;
}

/* ---- Nav menu desktop ---- */
.nav-menu {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-texto);
  font-weight: 700;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-base),
              border-color var(--transition-base);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-verde-oscuro);
  border-bottom-color: var(--color-verde-oscuro);
}

/* ---- Hamburger (CSS checkbox hack) ---- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-verde-oscuro);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: left center;
}

/* ---- Mobile (≤768px) ---- */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
  }

  .hamburger span:first-child { width: 26px; }
  .hamburger span:nth-child(2) { width: 20px; }
  .hamburger span:last-child { width: 26px; }

  .nav-menu {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-crema);
    border-bottom: 1px solid var(--color-sage);
    box-shadow: 0 8px 20px rgba(45, 90, 39, 0.1);
    padding: var(--spacing-sm) 0;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }

  .nav-toggle:checked ~ .hamburger + .nav-menu,
  .nav-toggle:checked + .hamburger + .nav-menu {
    max-height: 400px;
    padding: var(--spacing-sm) 0;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 0.85rem var(--container-padding);
    border-bottom: 1px solid var(--color-sage);
    font-size: 1rem;
    border-left: 3px solid transparent;
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .nav-link:hover,
  .nav-link.active {
    border-bottom-color: var(--color-sage);
    border-left-color: var(--color-verde-oscuro);
    background-color: rgba(184, 201, 168, 0.15);
  }

  /* Hamburger → X cuando está abierto */
  .nav-toggle:checked ~ .hamburger span:first-child,
  .nav-toggle:checked + .hamburger span:first-child {
    transform: rotate(45deg) translateY(-1px);
    width: 26px;
  }
  .nav-toggle:checked ~ .hamburger span:nth-child(2),
  .nav-toggle:checked + .hamburger span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }
  .nav-toggle:checked ~ .hamburger span:last-child,
  .nav-toggle:checked + .hamburger span:last-child {
    transform: rotate(-45deg) translateY(1px);
    width: 26px;
  }
}

/* ---- Extra small mobile (≤480px) ---- */
@media (max-width: 480px) {
  .nav-container {
    height: 65px;
  }

  .nav-logo-img {
    width: 32px;
    height: 32px;
  }

  .logo-text {
    font-size: 1.1rem;
  }

  .logo-tagline {
    font-size: 0.6rem;
  }

  .hamburger {
    width: 40px;
    height: 40px;
  }

  .hamburger span {
    height: 1.5px;
  }

  .hamburger span:first-child { width: 24px; }
  .hamburger span:nth-child(2) { width: 18px; }
  .hamburger span:last-child { width: 24px; }

  .nav-menu {
    top: 65px;
  }

  .nav-link {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
  }
}