/* === Site Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-darker-bg);
  border-bottom: 1px solid var(--color-border-dark);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header--scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
}

.site-header__logo img {
  height: 36px;
  width: auto;
}

/* Desktop Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  color: var(--color-text-white-muted);
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

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

.nav__arrow {
  font-size: 0.625rem;
  transition: transform var(--transition-fast);
}

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--color-dark-card);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-xl);
}

.nav__item:hover > .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__item:hover > .nav__link .nav__arrow {
  transform: rotate(180deg);
}

.nav__dropdown-link {
  display: block;
  padding: 0.5rem 1.25rem;
  color: var(--color-text-white-muted);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.nav__dropdown-link:hover {
  color: var(--color-primary);
  background: rgba(29, 185, 84, 0.05);
}

.nav__dropdown-link--active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav__dropdown-link--external::after {
  content: ' ↗';
  font-size: 0.7rem;
  opacity: 0.6;
}

/* Nav CTA Button */
.nav__cta {
  margin-left: 1rem;
  flex-shrink: 0;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  z-index: 1010;
}

.hamburger__line {
  width: 100%;
  height: 2px;
  background: var(--color-text-white);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.hamburger.active .hamburger__line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger__line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-darker-bg);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .nav.active {
    transform: translateX(0);
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__link {
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    justify-content: space-between;
    border-bottom: 1px solid var(--color-border-dark);
  }

  /* Mobile dropdown: click-triggered via JS */
  .nav__dropdown {
    position: static;
    background: rgba(0, 0, 0, 0.2);
    border: none;
    border-radius: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: max-height var(--transition-base);
    box-shadow: none;
  }

  .nav__item:hover > .nav__dropdown {
    /* Disable hover on mobile; JS handles it */
    max-height: 0;
  }

  .nav__dropdown.active {
    max-height: 600px;
  }

  .nav__dropdown-link {
    padding: 0.6rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .nav__cta {
    margin: 1rem 0 0;
    margin-left: 0;
    text-align: center;
    justify-content: center;
  }
}