/* ========================================
   丹江大观苑 - 导航栏
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 88px;
  z-index: 100;
  background-color: var(--color-brand-deep);
  border-bottom: 1px solid rgba(245, 241, 232, 0.08);
  transition: all var(--transition-base);
}

.nav.is-scrolled {
  height: 72px;
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-on-dark);
}

.nav__logo {
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gold);
}

.nav__logo svg {
  width: 20px;
  height: 20px;
}

/* 替换后的真 logo 图片（1018x276 ≈ 3.69:1） */
.nav__logo-img {
  height: 64px;
  width: auto;
  display: block;
}
@media (max-width: 768px) {
  .nav__logo-img { height: 48px; }
}
.nav.is-scrolled .nav__logo-img { height: 56px; }
.nav.is-scrolled .nav__brand-name { font-size: var(--text-lg); }

.nav__brand-name {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.05em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-10);
}

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-text-on-dark-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--space-2) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-gold);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-text-on-dark);
}

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

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

.nav__lang {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-on-dark-secondary);
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  transition: color var(--transition-fast);
}

.nav__lang:hover {
  color: var(--color-text-on-dark);
}

.nav__lang-divider {
  width: 1px;
  height: 16px;
  background-color: rgba(245, 241, 232, 0.2);
}

/* 移动端汉堡菜单 */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
}

.nav__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-on-dark);
  transition: all var(--transition-base);
}

@media (max-width: 1024px) {
  .nav__menu {
    position: fixed;
    top: 88px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-brand-deep);
    padding: var(--space-8) var(--container-padding);
    gap: var(--space-6);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }

  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__toggle {
    display: flex;
  }
}