/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  transition: background-color var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.header.scrolled .topbar {
  transform: translateY(-100%);
  height: 0;
  overflow: hidden;
  padding: 0;
}

.header.scrolled .nav__link {
  color: var(--color-gray-800);
}

.header.scrolled .nav__link:hover,
.header.scrolled .nav__link.active {
  color: var(--color-primary-dark);
}

/* ---- Top Bar ---- */
.topbar {
  background-color: var(--color-black);
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  height: var(--header-topbar-h);
  transition: all var(--transition);
}

.topbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.topbar__info {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.topbar__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.topbar__item svg {
  width: 14px;
  height: 14px;
  color: var(--color-primary);
}

.topbar__item a:hover {
  color: var(--color-primary);
}

.topbar__social {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar__social a {
  color: var(--color-gray-400);
  transition: color var(--transition);
  display: flex;
}

.topbar__social a:hover {
  color: var(--color-primary);
}

.topbar__social svg {
  width: 16px;
  height: 16px;
}

/* ---- Main Navigation ---- */
.navbar {
  height: var(--header-nav-h);
  background: transparent;
  transition: background-color var(--transition);
}

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

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav__logo img {
  height: 44px;
  width: auto;
}

.header.scrolled .nav__logo-white {
  display: none;
}

.header:not(.scrolled) .nav__logo-dark {
  display: none;
}

/* Nav Links */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-white);
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
}

/* CTA Button */
.nav__cta {
  margin-left: var(--space-4);
}

/* ---- Hamburger (Mobile) ---- */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  z-index: calc(var(--z-mobile-menu) + 1);
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

.header.scrolled .nav__hamburger span {
  background-color: var(--color-black);
}

.nav__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
  background-color: var(--color-white) !important;
}

.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
  background-color: var(--color-white) !important;
}

/* ---- Mobile Menu ---- */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.97);
  z-index: var(--z-mobile-menu);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  transition: right var(--transition-slow);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu__link {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-white);
  padding: var(--space-3) var(--space-6);
  transition: color var(--transition);
}

.mobile-menu__link:hover,
.mobile-menu__link.active {
  color: var(--color-primary);
}

.mobile-menu__cta {
  margin-top: var(--space-8);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .topbar {
    display: none;
  }

  .nav__menu,
  .nav__cta {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .header:not(.scrolled) .nav__logo-dark {
    display: block;
  }

  .header:not(.scrolled) .nav__logo-white {
    display: block;
  }
}

@media (max-width: 768px) {
  .nav__logo img {
    height: 36px;
  }
}