/*
 * Header Styles
 * 简洁通栏布局
 */
/*1 楼 Header - 普通布局 */
#header {
    z-index: 100;
    background: var(--bg-primary);
}

/* 滚动置顶状态 */
#header.scrolled {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    animation: slideDown 0.4s ease forwards;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0.5;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
.header-wrapper {
    display: flex;
    height: 36px;
    align-items: center;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--color-border);
}

.header-left {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.header-logo-img {
    height: 18px;
    margin-right: 8px;
}

.header-site-logo {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
    text-decoration: none;
}

.header-site-logo:hover {
    color: var(--color-link-hover);
}

.header-center {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 默认隐藏滚动时的导航菜单 */
.header-nav {
    display: none;
}

.header-nav .nav-container {
    display: flex;
    gap: 8px;
}

.header-nav .nav-container a {
    padding: 0 12px;
    font-size: 14px;
    color: var(--text-primary);
    text-decoration: none;
}

.header-nav .nav-container a:hover {
    color: var(--color-link-hover);
}

.header-nav .nav-container a.current {
    color: var(--text-accent);
}

/* 滚动后的状态 */
#header.scrolled .second-floor-container {
    position: absolute;
    top: -9999px;
    left: -9999px;
}

#header.scrolled .navigation {
    position: absolute;
    top: -9999px;
    left: -9999px;
}

#header.scrolled .header-nav {
    display: flex;
}

.header-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
}
.header-icon {
    color: var(--text-primary);
    font-size: 16px;
    text-decoration: none;
    padding: 8px 0;
    transition: color 0.3s ease;
}
.header-icon:hover {
    color: var(--color-link-hover);
}

/* 搜索容器 */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

/* 搜索表单 */
#search-form {
    position: absolute;
    right: 0;
    bottom: -1px;
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--color-border-bright);
    transition: width 0.3s ease, opacity 0.3s ease;
    opacity: 0;
    overflow: hidden;
    white-space: nowrap;
    z-index: 100;
    width: 0;
    min-width: 250px;
}

#search-form.active {
    opacity: 1;
}

#search-form input {
    border: none;
    outline: none;
    padding: 8px 12px;
    font-size: 14px;
    background: transparent;
    color: var(--text-primary);
    flex: 1;
    min-width: 0;
    box-sizing: border-box;
}

#search-form input::placeholder {
    color: var(--text-muted);
}

#search-form button {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    padding: 8px;
    cursor: pointer;
}

#search-form button:hover {
    color: var(--color-link-hover);
}

/* 搜索切换按钮 */
.search-toggle {
    z-index: 101;
    position: relative;
}

#search-form.active + .search-toggle {
    opacity: 0;
    pointer-events: none;
}
/*2 楼 logo */
.second-floor-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--global-max-width);
  margin: 0 auto;
  width: 100%;
  padding: 20px 0;
}

.second-floor-left {
  flex: 0 0 200px;
  display: flex;
  align-items: center;
}

.second-floor-center {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-link {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  height: 100%;
}

.logo-link:hover {
  opacity: 0.8;
}

.logo-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
  display: block;
}

.logo-link:hover .logo-svg text:first-of-type {
  fill: var(--color-text-primary);
}

.second-floor-right {
  flex: 0 0 200px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* 默认隐藏移动端搜索表单（桌面端不显示） */
.second-floor-left #mobile-search-form {
    display: none;
}

/* 3楼 导航分类 */
.navigation {
  background: var(--bg-primary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* 移动端响应式样式 */
@media screen and (max-width: 767px) {
    /* 隐藏1楼的搜索切换按钮 */
    .header-right .search-toggle {
        display: none;
    }
    
    /* 隐藏2楼的LOGO容器 */
    .second-floor-center {
        display: none;
    }
    
    /* 2楼左侧区域显示搜索框 */
    .second-floor-left {
        flex: 1;
        display: flex;
        justify-content: center;
        padding: 0 15px;
    }
    
    /* 2楼右侧区域隐藏 */
    .second-floor-right {
        display: none;
    }
    
    /* 移动端搜索表单样式 */
    .second-floor-left #mobile-search-form {
        width: 100%;
        max-width: 300px;
        display: flex;
        align-items: center;
        background: var(--bg-secondary);
        border-radius: 20px;
        padding: 6px 12px;
        border: 1px solid var(--color-border);
    }
    
    .second-floor-left #mobile-search-form input {
        flex: 1;
        border: none;
        outline: none;
        background: transparent;
        font-size: 14px;
        color: var(--text-primary);
        padding: 4px 8px;
    }
    
    .second-floor-left #mobile-search-form input::placeholder {
        color: var(--text-muted);
    }
    
    .second-floor-left #mobile-search-form button {
        background: transparent;
        border: none;
        outline: none;
        color: var(--text-primary);
        padding: 4px;
        cursor: pointer;
    }
    
    .second-floor-left #mobile-search-form button:hover {
        color: var(--color-link-hover);
    }
}

.nav-container {
  max-width: var(--global-max-width);
  margin: 0 auto;
  padding: 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.nav-container a {
  display: block;
  padding: 12px 20px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: var(--font-size-base);
  transition: all 0.3s ease;
}

.nav-container a:hover {
  color: var(--color-link-hover);
  background: var(--bg-secondary);
}

.nav-container a.current {
  color: var(--text-accent);
  border-bottom: 1px solid var(--text-accent);
}