/* --- 全局和颜色变量 --- */
:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #bb86fc;
    --text-color: #e0e0e0;
    --text-secondary-color: #a0a0a0;
    --border-color: #333;
    --card-text-color: #ffffff;
    --card-border-color: rgba(255, 255, 255, 0.18);
    /* * --- 卡片透明度 (深色模式) ---
     * 修改 rgba 中的最后一个值 (0.45) 来调整。数值越小，卡片越透明。
     */
    --card-bg-color: rgba(0, 0, 0, 0.45);
    --card-text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

body.light-mode {
    --bg-color: #f0f2f5;
    --surface-color: #ffffff;
    --primary-color: #6200ee;
    --text-color: #000000;
    --text-secondary-color: #5f6368;
    --border-color: #e0e0e0;
    /* * --- 卡片透明度 (浅色模式) ---
     * 修改 rgba 中的最后一个值 (0.55) 来调整。数值越小，卡片越透明。
     */
    --card-text-color: #000000;
    --card-border-color: rgba(0, 0, 0, 0.1);
    --card-bg-color: rgba(255, 255, 255, 0.55);
    --card-text-shadow: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    color: var(--text-color);
    background-color: var(--bg-color);
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    /* * --- 电脑端背景图 ---
     * 修改 url('...') 中的图片地址来更换电脑端的背景。
     */
    background-image: url('https://cdn.jsdelivr.net/gh/xuhxjx/myimg@main/wallpaper_1.jpg');
    background-size: cover;
    background-position: center;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    margin-bottom: 2rem;
}

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

.logo-title {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-logo {
    width: 44px;
    height: 44px;
    background-image: url('/logo.svg');
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}

h1 {
    font-size: 1.2rem;
    color: var(--text-color);
    margin: 0;
}

.main-nav {
    margin-top: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.main-nav li {
    position: relative;
}

.main-nav li a {
    display: block;
    padding: 0.8rem 1rem;
    text-decoration: none;
    color: var(--text-secondary-color);
    font-weight: 500;
    transition: color 0.2s, border-bottom-color 0.2s;
    border-bottom: 2px solid transparent;
    cursor: pointer;
}

.main-nav li a:hover {
    color: var(--primary-color);
}

.main-nav li a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.dropdown-content {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    position: absolute;
    background-color: transparent;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    list-style: none;
    padding: 5px;
    margin-top: -2px;
}
.dropdown-content.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-content a {
    padding: 10px 14px;
    border-bottom: none !important;
    border-radius: 6px;
    text-shadow: var(--card-text-shadow);
}
.dropdown-content a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}
.dropdown-content a.active {
    color: var(--primary-color);
    font-weight: bold;
}

/* --- 搜索区域样式 --- */
.search-section {
    max-width: 600px;
    margin: 2.5rem auto;
}
.search-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.search-tab {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    background: transparent;
    border: 1px solid transparent;
    transition: background-color 0.2s;
}
.search-tab:hover {
    background: rgba(255,255,255,0.1);
}
.search-tab.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
}
.search-tab span {
    color: var(--text-secondary-color);
    font-weight: 500;
}
.search-tab.active span {
    color: var(--text-color);
}
.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}
.search-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border-color);
    border-radius: 12px;
    padding: 15px 60px 15px 20px;
    font-size: 1.1rem;
    color: var(--text-color);
    outline: none;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}
body.light-mode .search-input {
    background: rgba(255, 255, 255, 0.4);
}
.search-button {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    border-radius: 8px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.search-button svg {
    stroke: var(--text-secondary-color);
    transition: stroke 0.2s;
}
.search-button:hover svg {
    stroke: var(--primary-color);
}

/* --- 卡片样式 --- */
.link-group { margin-top: 2rem; }
.link-group ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 15px; }
.link-group a { display: flex; flex-direction: column; align-items: center; justify-content: center; text-decoration: none; color: var(--card-text-color); border-radius: 12px; padding: 15px; height: 110px; box-sizing: border-box; text-align: center; transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    
    background: var(--card-bg-color);
    /* * --- 玻璃模糊度 ---
     * 修改 blur() 中的数值来调整“磨砂”效果。数值越小，背景越清晰。
     */
    backdrop-filter: blur(1px); 
    -webkit-backdrop-filter: blur(1px);
    border: 1px solid var(--card-border-color); box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1); }
.link-group a:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}
.card-icon {
    /* * --- 卡片内图标大小 (电脑端) ---
     * 修改这里的 width 和 height 来调整卡片上图标的大小。
     */
    width: 36px;
    height: 36px;
    margin-bottom: 12px;
    border-radius: 50%;
    background-color: transparent;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-image: none;
}
.card-name {
    font-weight: 500;
    /* * --- 卡片内字体大小 (电脑端) ---
     * 修改这里的数值来调整卡片上网站名称的字体大小。
     */
    font-size: 1rem;
    line-height: 1.2;
    word-break: break-word;
    text-shadow: var(--card-text-shadow);
}
.placeholder { text-align: center; font-size: 1.2rem; color: var(--text-secondary-color); padding: 4rem; }
.placeholder.error { color: var(--error-color); }
.theme-switcher { display: flex; align-items: center; }
.theme-switcher label { width: 30px; height: 30px; cursor: pointer; position: relative; display: flex; align-items: center; justify-content: center; }
.theme-switcher svg { position: absolute; width: 24px; height: 24px; transition: opacity 0.3s ease, transform 0.3s ease; stroke: var(--text-color); }
.theme-switcher .sun-icon { opacity: 0; transform: rotate(-90deg); }
.theme-switcher .moon-icon { opacity: 1; transform: rotate(0deg); }
.theme-switcher input { display: none; }
.theme-switcher input:checked + label .sun-icon { opacity: 1; transform: rotate(0deg); }
.theme-switcher input:checked + label .moon-icon { opacity: 0; transform: rotate(90deg); }

/* --- 响应式设计 --- */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    body::before {
        /* * --- 手机端背景图 ---
         * 修改这里的图片地址来更换手机端的背景。
         */
        background-image: url('https://cdn.jsdelivr.net/gh/xuhxjx/myimg@main/IMG_5251.JPG');
        /* 修复移动端背景闪烁和缩放问题 */
        background-attachment: scroll; 
    }

    h1 {
        font-size: 1.2rem;
    }

    .header-logo {
        width: 36px;
        height: 36px;
    }

    .card-group-title {
        font-size: 1rem;
    }

    .link-group ul {
        /* * --- 手机端卡片宽度 ---
         * 修改这里的 minmax() 中的第一个值 (100px) 来调整卡片宽度。
         * 数值越小，每行能容纳的卡片越多。
         */
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 10px;
    }
    
    .link-group a {
        /* * --- 手机端卡片高度 ---
         * 修改这里的 height 值来调整卡片的高度。
         */
        height: 90px;
        /* 修复：在手机端禁用模糊效果以解决闪烁 */
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    /* 修复：在手机端禁用下拉菜单的模糊效果 */
    .dropdown-content {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        /* 在手机上给下拉菜单一个不透明背景 */
        background-color: var(--surface-color);
    }
    
    /* 修复：在手机端禁用搜索框的模糊效果 */
    .search-input {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .main-nav li a {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }
    
    /* * --- 手机端卡片内图标和字体大小 --- */
    .card-icon {
        width: 30px;
        height: 30px;
        margin-bottom: 8px;
    }
    .card-name {
        font-size: 0.8rem;
    }
    
    .search-section { margin: 1.5rem auto; }
    .search-input { padding: 12px 50px 12px 15px; font-size: 1rem; }
    .search-button { width: 36px; height: 36px; }
    .search-tab { padding: 6px 10px; }
    .search-tab span { font-size: 0.9rem; }
}