/**
 * Header Section — Bird Capital Website
 * Static header with logo left, nav right (Left Lane inspired)
 */

.header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: var(--space-md);
  background-color: transparent;
}

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

/* Logo */
.header__logo {
  display: block;
  width: 100px;
  height: auto;
  transition: opacity var(--transition-fast);
}

.header__logo:hover {
  opacity: 0.8;
}

.header__logo img {
  width: 100%;
  height: auto;
}

/* Navigation */
.header__nav {
  display: none;
}

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

.header__link {
  font-family: var(--font-secondary);
  font-size: 0.875rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-background-white);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity var(--transition-fast);
}

.header__link:hover {
  opacity: 0.7;
  color: var(--color-background-white);
}

/* Language switcher */
.header__lang {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: var(--space-md);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--color-background-white);
  font-family: var(--font-secondary);
  font-size: 0.75rem;
  font-weight: var(--font-weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
  padding: 0;
}

.lang-btn:hover,
.lang-btn.is-active {
  opacity: 1;
}

.lang-divider {
  color: var(--color-background-white);
  opacity: 0.4;
  font-size: 0.75rem;
}

/* Mobile toggle button */
.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}

.header__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-background-white);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Toggle active state */
.header__toggle.is-active .header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__toggle.is-active .header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.header__toggle.is-active .header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay */
.header__nav.is-open {
  display: flex;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--color-background-dark);
  z-index: 99;
}

.header__nav.is-open .header__menu {
  flex-direction: column;
  gap: var(--space-lg);
}

.header__nav.is-open .header__link {
  font-size: 1.5rem;
}

/* ===== RESPONSIVE ===== */

@media (min-width: 768px) {
  .header {
    padding-block: var(--space-lg);
  }

  .header__logo {
    width: 120px;
  }

  /* Show desktop nav, hide toggle */
  .header__nav {
    display: block;
  }

  .header__toggle {
    display: none;
  }
}

@media (min-width: 1024px) {
  .header__logo {
    width: 140px;
  }

  .header__link {
    font-size: 0.9375rem;
  }

  .header__menu {
    gap: var(--space-xl);
  }
}