/* ============================================
   2027AI旗舰版 - Header
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9990;
  transition: var(--transition-normal);
  background: transparent;
}

.header.scrolled {
  background: rgba(247, 243, 238, 0.92);
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  border-bottom: 1px solid rgba(0, 179, 126, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 72px;
  padding: 0 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  width: 100%;
  gap: 24px;
}

.header-inner .nav-menu {
  margin-right: auto;
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.header-logo a {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo img {
  height: 44px;
  width: auto;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.05));
}

/* Navigation */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}

.nav-menu > li {
  position: relative;
}

.nav-menu > li > a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.nav-menu > li > a:hover,
.nav-menu > li.active > a {
  color: var(--text-primary);
  background: rgba(0,179,126,0.06);
}

.nav-menu > li.active > a {
  color: var(--primary);
}

/* Dropdown */
.nav-menu li ul {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-md);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: var(--transition-normal);
  pointer-events: none;
  box-shadow: var(--shadow-lg);
}

.nav-menu li:hover ul {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-menu li ul li a {
  display: block;
  padding: 10px 14px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.nav-menu li ul li a:hover {
  color: var(--primary);
  background: rgba(0,179,126,0.06);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Language Switcher */
.lang-switch {
  position: relative;
}

.lang-switch > a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  color: var(--text-dark-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0,0,0,0.12);
  background: rgba(255,255,255,0.6);
  transition: var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.lang-switch > a:hover {
  color: var(--primary-dark);
  border-color: rgba(0,179,126,0.4);
  background: rgba(0,179,126,0.1);
}

.lang-switch .lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 140px;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: var(--radius-md);
  padding: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: var(--transition-fast);
}

.lang-switch:hover .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-switch .lang-dropdown a {
  display: block;
  padding: 8px 14px;
  color: var(--text-dark-secondary);
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
  border: none;
}

.lang-switch .lang-dropdown a:hover {
  color: var(--primary-dark);
  background: rgba(0,179,126,0.1);
}

/* 移动端汉堡菜单内的语言切换入口（仅在窄屏显示） */
.mobile-lang-switch {
  display: none;
}

/* AI Status */
.ai-status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px 6px 12px;
  background: rgba(0,179,126,0.08);
  border: 1px solid rgba(0,179,126,0.15);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
}

.ai-status-badge:hover {
  background: rgba(0,179,126,0.12);
  border-color: rgba(0,179,126,0.25);
}

.ai-status-dot {
  position: relative;
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: 50%;
  animation: status-pulse 2s ease-in-out infinite;
}

.ai-status-dot::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 1px solid rgba(0,179,126,0.3);
  animation: status-ring 2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes status-ring {
  0% { transform: scale(1); opacity: 0.5; }
  100% { transform: scale(1.5); opacity: 0; }
}

.ai-status-text {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--primary);
  white-space: nowrap;
}

/* Mobile Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-normal);
}

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

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

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

/* Responsive */
/* 中屏：压缩导航与 logo，避免文字换行 */
@media (max-width: 1500px) {
  .header-inner {
    gap: 16px;
  }

  .header-logo img {
    height: 40px;
  }

  .nav-menu > li > a {
    padding: 8px 10px;
    font-size: 0.875rem;
  }

  /* AI 徽标仅保留指示灯，节省横向空间 */
  .ai-status-badge {
    padding: 8px;
  }

  .ai-status-badge .ai-status-text {
    display: none;
  }
}

/* 窄屏：切换为汉堡菜单 */
@media (max-width: 1360px) {
  .nav-toggle {
    display: flex;
  }

  .header-inner {
    gap: 0;
    height: 68px;
  }
  .header-actions {
    margin-left: auto;
  }
  .lang-switch {
    display: none;
  }
  .mobile-lang-switch {
    display: block;
  }
  .mobile-lang-switch a {
    font-weight: 600;
    color: var(--primary-dark) !important;
  }
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    height: calc(100vh - 68px);
    background: rgba(247, 243, 238, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: var(--transition-normal);
  }

  .nav-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-menu > li > a {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav-menu li ul {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: transparent;
    border: none;
    padding: 0 0 0 16px;
    display: none;
    box-shadow: none;
  }

  .nav-menu li.open ul {
    display: block;
  }

  .header-actions {
    gap: 8px;
  }

  .ai-status-badge .ai-status-text {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 12px;
    height: 68px;
  }
  .header-logo img {
    height: 40px;
    max-width: calc(100vw - 124px);
    object-fit: contain;
    object-position: left center;
  }
}