/* ============================================
   Header CSS - 导航栏
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition-base);
  padding: 1rem 0;
}

/* 透明状态（首页Hero时） */
.header-transparent {
  background-color: transparent;
}

.header-transparent .header-logo-text,
.header-transparent .nav-link,
.header-transparent .lang-switch {
  color: #ffffff;
}

.header-transparent .nav-link:hover {
  color: var(--color-primary);
}

/* 滚动后深色固定状态 */
.header-scrolled {
  background-color: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 0.625rem 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.header-logo-icon {
  width: 42px;
  height: 42px;
}

.header-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.2;
  transition: color var(--transition-base);
}

.header-logo-text small {
  display: block;
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-top: 2px;
}

/* 主导航 */
.header-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  font-size: 0.9375rem;
  color: #ffffff;
  font-weight: 500;
  transition: color var(--transition-base);
  position: relative;
  white-space: nowrap;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

.nav-link:hover {
  color: var(--color-primary-light);
}

.nav-link.active {
  color: var(--color-primary-light);
}

/* 右侧操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 语言切换 */
.lang-switch {
  display: flex;
  align-items: center;
  font-size: 0.8125rem;
  color: #ffffff;
  cursor: pointer;
  transition: color var(--transition-base);
  white-space: nowrap;
}

.lang-switch:hover {
  color: var(--color-primary-light);
}

.lang-switch .divider {
  margin: 0 0.375rem;
  opacity: 0.4;
}

.lang-switch .active-lang {
  color: var(--color-primary-light);
  font-weight: 600;
}

/* CTA 按钮 */
.header-cta {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.header-cta:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(212, 35, 42, 0.3);
}

/* 汉堡菜单按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #ffffff;
  transition: all var(--transition-base);
  border-radius: 2px;
}

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

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

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

/* 移动端导航内的操作按钮（桌面端隐藏） */
.mobile-actions {
  display: none;
}

@media (max-width: 1023px) {
  .hamburger {
    display: flex;
  }

  .header-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 360px;
    height: 100vh;
    background-color: var(--color-bg-dark);
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem 2rem 2rem;
    gap: 0;
    transition: right var(--transition-base);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.2);
  }

  .header-nav.open {
    right: 0;
  }

  .nav-link {
    width: 100%;
    padding: 0.875rem 0;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-link::after {
    display: none;
  }

  .header-actions {
    display: none;
  }

  /* 移动端导航内的操作按钮 */
  .mobile-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .mobile-actions .header-cta {
    text-align: center;
    justify-content: center;
    width: 100%;
    padding: 0.75rem;
  }

  .mobile-actions .lang-switch {
    color: rgba(255, 255, 255, 0.6);
    justify-content: center;
  }
}

/* 遮罩层 */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}