/* 环球软件集市 · 头部导航样式 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}
.header-inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-4);
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}
.logo__img { width: 36px; height: 36px; }
.logo__text {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

/* 导航 */
.nav-wrapper { flex: 1; }
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.nav-item { position: relative; }
.nav-link {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: all 0.2s;
}
.nav-link:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}
.nav-link--special {
  color: var(--color-primary);
  font-weight: 600;
}
.nav-item--special {
  border-left: 1px solid var(--border-color);
  margin-left: var(--space-2);
  padding-left: var(--space-2);
}
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all 0.2s;
  z-index: 200;
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown__inner { padding: var(--space-4); }
.nav-dropdown__placeholder {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
  padding: var(--space-4);
}

/* 右侧功能区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}
.search-box {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.search-input {
  width: 200px;
  transition: width 0.3s;
}
.search-input:focus { width: 260px; }

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .header-actions {
    display: none;
  }
  .nav-wrapper {
    display: none;
  }
  .nav-wrapper.open {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-surface);
    z-index: 99;
    padding: var(--space-4);
    overflow-y: auto;
  }
  .nav-wrapper.open .main-nav {
    flex-direction: column;
    align-items: stretch;
  }
  .nav-wrapper.open .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--space-4);
  }
  .hamburger {
    display: flex;
  }
}