:root {
  /* 定义卡片背景颜色（透明度可调） */
  --card-bg-alpha: 0.75;
  --card-bg: rgba(255, 255, 255, var(--card-bg-alpha));
}

[data-theme="dark"] {
  --card-bg: rgba(25, 25, 25, 0.6);
}

/* 1. 卡片背景透明化（首页文章、侧边栏、说说等） */
#recent-posts .recent-post-item,
#aside-content .card-widget,
.layout .pagination > *:not(.space),
#article-container .shuoshuo-item {
  background: var(--card-bg) !important;
  border-radius: 15px !important;
}

/* 2. 顶部横幅透明化（去背景图、去蓝色、去遮罩） */
#page-header {
  background-color: transparent !important;
  background-image: none !important;
}

#page-header::before {
  background: transparent !important;
}

/* 3. 导航栏布局调整（使其更紧凑） */
#nav {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
}

#nav #blog-info {
    flex: 0 0 auto;
    margin-right: 20px;
}

#nav #menus {
    flex: 1;
    display: flex !important;
    align-items: center;
    justify-content: flex-start; /* 菜单左对齐 */
}

#nav .menus_items {
    display: inline-flex !important;
}

#nav #search-button {
    margin-left: auto;
}

#nav #toggle-menu {
    display: none;
}

@media screen and (max-width: 768px) {
    #nav .menus_items {
        display: none !important;
    }
    #nav #toggle-menu {
        display: block !important;
    }
}
/* --- Category Cards Style --- */
.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.category-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    height: 180px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: all 0.3s;
    display: block !important;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

.category-card-bg {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform 0.5s;
}

.category-card:hover .category-card-bg {
    transform: scale(1.1);
}

.category-card-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff !important;
    text-shadow: 0 2px 4px rgba(0,0,0,0.6);
    z-index: 2;
    pointer-events: none;
}

.category-card-name {
    font-size: 1.8em;
    font-weight: bold;
    margin-bottom: 5px;
}

.category-card-count {
    font-size: 1em;
    opacity: 0.9;
}

/* Add a dark overlay to make text readable */
.category-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.25);
    transition: background 0.3s;
}

.category-card:hover::after {
    background: rgba(0,0,0,0.1);
}

/* =======================================
   手机端专属排版优化：直接换用竖屏壁纸
   ======================================= */
@media screen and (max-width: 768px) {
    /* 让首页顶部和全局背景都强制换成竖版图 */
    #page-header, #web_bg {
        background-image: url('/img/mobile_bg.jpeg') !important;
        background-position: center center !important;
    }
}