/* ============================================
   AegisX - 头部导航样式 v3.0
   全终端响应式 / SEO语义化 / Sticky导航
   ============================================ */

/* 头部容器 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(10, 14, 23, 0.95);
}

/* 浅色主题（控制台/个人中心等深色页面使用） */
.header--light,
.header--light.header--scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: rgba(15, 23, 42, 0.08);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

.header--light .header__logo-text {
  color: #0f172a;
  -webkit-text-fill-color: #0f172a;
  background: none;
}

.header--light .header__nav-link {
  color: #475569;
}

.header--light .header__nav-link:hover,
.header--light .header__nav-link--active {
  color: #0f172a;
  background: rgba(15, 23, 42, 0.05);
}

.header--light .header__menu-toggle {
  color: #0f172a;
}

.header--light .header__menu-toggle:hover {
  background: rgba(15, 23, 42, 0.05);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Logo区域 */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-decoration: none;
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

.header__logo:hover {
  opacity: 0.85;
}

.header__logo img {
  height: 36px;
  width: auto;
}

.header__logo svg {
  height: 36px;
  width: auto;
}

.header__logo-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 主导航菜单 */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
}

.header__nav-link:hover,
.header__nav-link--active {
  color: var(--text-primary);
  background: var(--border-color);
}

.header__nav-link--active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

/* 下拉菜单 */
.header__dropdown {
  position: relative;
}

.header__dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform-origin: top center;
  transition: all var(--transition-base);
  z-index: 10001;
}

.header__dropdown:hover .header__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.header__dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.header__dropdown-item:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.header__dropdown-item .dropdown-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.header__dropdown-item--all {
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-1);
  padding-top: var(--space-4);
  color: var(--primary) !important;
  font-weight: var(--font-weight-semibold);
}

.header__dropdown-item--all:hover {
  background: rgba(0, 212, 255, 0.1) !important;
}

/* 右侧操作区 */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* 移动端汉堡菜单按钮 */
.header__menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.header__menu-toggle:hover {
  background: var(--border-color);
}

.header__menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
  transition: all var(--transition-base);
}

.header__menu-toggle span::before,
.header__menu-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: all var(--transition-base);
}

.header__menu-toggle span::before {
  top: -7px;
}

.header__menu-toggle span::after {
  top: 7px;
}

/* 汉堡菜单激活状态 */
.header__menu-toggle--active span {
  background: transparent;
}

.header__menu-toggle--active span::before {
  top: 0;
  transform: rotate(45deg);
}

.header__menu-toggle--active span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* 移动端导航遮罩 */
.header__mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: calc(var(--z-header) - 1);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.header__mobile-overlay--visible {
  opacity: 1;
}

/* 移动端导航面板 */
.header__mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-secondary);
  z-index: calc(var(--z-header) - 1);
  padding: var(--space-6);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

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

.header__mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  text-decoration: none;
}

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

.header__mobile-sub {
  padding-left: var(--space-4);
}

.header__mobile-sub .header__mobile-nav-link {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  color: var(--text-secondary);
}

/* 头部CTA按钮组 */
.header__cta-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* 用户头像 */
.header__user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header__user-avatar:hover {
  background: var(--primary);
  color: var(--text-inverse);
}

/* 用户菜单 */
.header__cta-group--user {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
}

.header__user-menu { position: relative; }

.header__user-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 3px;
  border-radius: 50%;
  transition: all .2s;
  background: transparent;
  border: 2px solid transparent;
  font-family: inherit;
  font-size: 14px;
  line-height: 1;
}

.header__user-trigger:hover,
.header__user-trigger:focus {
  border-color: rgba(31,111,235,0.3);
  outline: none;
}

.header__user-menu--open .header__user-trigger {
  border-color: var(--primary, #1f6feb);
}

.user-avatar-sm {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 15px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary, #8b5cf6));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform .2s;
}

.header__user-trigger:hover .user-avatar-sm {
  transform: scale(1.05);
}

/* 下拉菜单中的用户信息 */
.header__user-info {
  padding: 12px 16px 8px;
}

.header__user-name {
  font-size: 13px;
  font-weight: 600;
  color: #11243f;
  word-break: break-all;
}

.header__user-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: -8px;
  min-width: 160px;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 12px;
  padding: 0;
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all .2s ease;
  z-index: 10000;
}

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

.header__user-item {
  display: block;
  width: 100%;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 500;
  color: #334155;
  text-decoration: none;
  transition: all .15s;
  white-space: nowrap;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}

.header__user-item:hover,
.header__user-item:focus {
  background: #f1f5f9;
  color: #0f172a;
  outline: none;
}

.header__user-item--danger {
  color: #dc2626;
}

.header__user-item--danger:hover,
.header__user-item--danger:focus {
  background: #fef2f2;
  color: #b91c1c;
}

.header__user-divider {
  height: 1px;
  margin: 4px 12px;
  background: rgba(15, 23, 42, 0.08);
}

@media screen and (max-width: 768px) {
  .header__user-trigger { padding: 2px; }
  .user-avatar-sm { width: 30px; height: 30px; font-size: 13px; }
}

/* ==================================================================
   响应式 - 平板端
   ================================================================== */
@media screen and (max-width: 1024px) {
  .header__nav {
    display: none;
  }

  .header__menu-toggle {
    display: flex;
  }

  .header__mobile-nav {
    display: block;
  }

  .header__mobile-overlay {
    display: block;
  }

  .header__cta-group .btn--outline {
    display: none;
  }
}

@media screen and (max-width: 768px) {
  .header__inner {
    padding: 0 var(--space-4);
  }

  .header__logo-text {
    font-size: var(--font-size-lg);
  }

  .header__cta-group .btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
  }
}

@media screen and (max-width: 480px) {
  .header__logo img,
  .header__logo svg {
    height: 28px;
  }

  .header__logo-text {
    font-size: var(--font-size-base);
  }

  .header__cta-group .btn--primary {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }
}