.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition-normal);
}

.nav--scrolled {
  background-color: var(--color-white);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  padding: 12px 0;
}

.nav__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.nav__logo-text {
  font-family: var(--font-en);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
}

.nav__logo-sub {
  font-size: 14px;
  color: var(--color-secondary);
}

/* Menu */
.nav__menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  font-size: 15px;
  color: var(--color-text);
  position: relative;
  padding: 8px 0;
  transition: var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: var(--transition-normal);
}

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

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

/* Language Switcher */
.nav__lang {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--color-text);
  padding: 8px 12px;
  border-radius: var(--radius-btn);
  transition: var(--transition-fast);
}

.nav__lang:hover {
  background-color: var(--color-bg-1);
}

.nav__lang-zh.active,
.nav__lang-en.active {
  color: var(--color-primary);
  font-weight: 700;
}

.nav__lang-divider {
  color: var(--color-accent);
}

/* Mobile Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.nav__toggle-bar {
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition-normal);
}

/* Mobile Menu Open State */
.nav__toggle--active .nav__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

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

/* Mobile Styles */
@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: calc(100vh - 60px);
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 40px;
    gap: 0;
    background-color: var(--color-white);
    transform: translateX(-100%);
    transition: var(--transition-normal);
  }

  .nav__menu--open {
    transform: translateX(0);
  }

  .nav__item {
    width: 100%;
    text-align: center;
  }

  .nav__link {
    display: block;
    padding: 16px 24px;
    font-size: 18px;
  }

  .nav__link::after {
    display: none;
  }

  .nav__link--active {
    background-color: var(--color-bg-2);
  }

  .nav__toggle {
    display: flex;
  }

  .nav__lang {
    order: -1;
    margin-right: 16px;
  }
}