/* ==========================================================================
   Header Styles
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  transition: box-shadow var(--transition-base);
}

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

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

.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo img {
  display: block;
  height: 40px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
}

/* Burger Button */
.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 1001;
}

.header__burger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

/* Burger animation — open state (lines transform to X) */
.header__burger--open .header__burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__burger--open .header__burger-line:nth-child(2) {
  opacity: 0;
}

.header__burger--open .header__burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Navigation Menu */
.header__menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-lg);
}

.header__menu-item {
  margin: 0;
  padding: 0;
}

.header__menu-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  padding: var(--spacing-sm) 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.header__menu-link:hover,
.header__menu-link:focus-visible {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
  outline: none;
}

.header__menu-link--active {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

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

  .header__menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    gap: var(--spacing-md);
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    z-index: 999;
  }

  .header__menu--open {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }

  .header__menu-link {
    display: block;
    font-size: var(--font-size-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .header__menu-link:hover,
  .header__menu-link--active {
    border-bottom-color: transparent;
    border-left-color: var(--color-secondary);
  }
}

/* Body scroll lock when menu is open */
body.no-scroll {
  overflow: hidden;
}