/* ===========================
   A4 Estudio — Header
   =========================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: background-color var(--transition);
}

.site-header.scrolled {
  background: var(--color-white);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--container-padding);
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  z-index: 1001;
}

.header-logo .logo-img {
  height: 32px;
  width: auto;
  transition: filter var(--transition);
}

.header-logo .logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  transition: color var(--transition);
}

/* On dark backgrounds (home), logo and text are white */
body.home .site-header:not(.scrolled) .logo-img {
  filter: brightness(0) invert(1);
}

body.home .site-header:not(.scrolled) .logo-text {
  color: var(--color-white);
}

.site-header.scrolled .logo-text {
  color: var(--color-black);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.main-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.main-nav .nav-list li a {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  color: var(--color-white);
  transition: color var(--transition), opacity var(--transition);
  position: relative;
}

.main-nav .nav-list li a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--transition);
}

.main-nav .nav-list li a:hover {
  opacity: 1;
}

.main-nav .nav-list li a:hover::after {
  width: 100%;
}

body.home .site-header:not(.scrolled) .nav-list li a {
  color: var(--color-white);
}

.site-header.scrolled .nav-list li a {
  color: var(--color-black);
}

/* On non-home pages, header starts with dark text */
body:not(.home) .site-header .logo-text {
  color: var(--color-black);
}

body:not(.home) .site-header .nav-list li a {
  color: var(--color-black);
}

body:not(.home) .site-header {
  background: var(--color-white);
}

/* Contacto CTA button (last menu item) */
.main-nav .nav-list li:last-child a {
  background: var(--color-white);
  color: var(--color-black) !important;
  padding: 10px 24px;
  border-radius: 50px;
  transition: background var(--transition), color var(--transition), opacity var(--transition);
}

.main-nav .nav-list li:last-child a::after {
  display: none;
}

.main-nav .nav-list li:last-child a:hover {
  opacity: 0.85;
}

.site-header.scrolled .nav-list li:last-child a,
body:not(.home) .nav-list li:last-child a {
  background: var(--color-black);
  color: var(--color-white) !important;
}

/* Language Switch — glassmorphism button */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 20px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 8px 16px;
  border-radius: 50px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: background var(--transition), border-color var(--transition);
}

.site-header.scrolled .lang-switch,
body:not(.home) .lang-switch {
  background: rgba(0, 0, 0, 0.06);
  border-color: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.lang-btn {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  color: var(--color-white);
  opacity: 0.6;
  transition: color var(--transition), opacity var(--transition);
  padding: 0;
  cursor: pointer;
}

.lang-btn.active {
  opacity: 1;
  font-weight: 500;
}

.lang-btn:hover {
  opacity: 1;
}

.lang-divider {
  font-size: 14px;
  color: var(--color-white);
  opacity: 0.3;
  transition: color var(--transition);
}

body.home .site-header:not(.scrolled) .lang-btn,
body.home .site-header:not(.scrolled) .lang-divider {
  color: var(--color-white);
}

.site-header.scrolled .lang-btn,
.site-header.scrolled .lang-divider {
  color: var(--color-black);
}

body:not(.home) .lang-btn,
body:not(.home) .lang-divider {
  color: var(--color-black);
}

/* Hamburger Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  z-index: 1001;
  padding: 0;
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-white);
  transition: transform var(--transition), opacity var(--transition), background var(--transition);
}

.site-header.scrolled .hamburger-line,
body:not(.home) .hamburger-line {
  background: var(--color-black);
}

/* Hamburger active state (X) */
.menu-toggle.active .hamburger-line:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active .hamburger-line:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

.menu-toggle.active .hamburger-line {
  background: var(--color-white);
}

/* Tablet + Mobile: hamburger menu */
@media (max-width: 1024px) {
  .menu-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-gray-900);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
    z-index: 1000;
  }

  .main-nav.open {
    opacity: 1;
    visibility: visible;
  }

  .main-nav .nav-list {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }

  .main-nav .nav-list li a {
    font-size: 16px;
    color: var(--color-white) !important;
  }

  .main-nav .nav-list li:last-child a {
    background: var(--color-white) !important;
    color: var(--color-black) !important;
  }

  .lang-switch {
    margin-left: 0;
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
  }

  .lang-btn,
  .lang-divider {
    color: var(--color-white) !important;
  }
}

/* Mobile: touch-optimized sizes */
@media (max-width: 768px) {
  .main-nav .nav-list li:last-child a {
    padding: 14px 28px;
  }

  .lang-switch {
    padding: 10px 18px;
  }
}