* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 默认颜色（亮色主题） */
    --bg: #f7f9fc;
    --text: #1a2332;
    --heading: #0a1220;
    --primary: #3b7fbd;
    --accent: #1f5a8e;
    --border: #c0cfde;
    --table-bg: #ffffff;
    --input-bg: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.85);
    --font-size: 16px;
    --border-radius: 6px;
    --nav-bg: rgba(255, 255, 255, 0.92);
    --nav-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
    --nav-height: 64px;
}

body {
    font-family: 'Segoe UI', Roboto, system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    font-size: var(--font-size);
    padding: calc(var(--nav-height) + 24px) 40px 30px;
    transition: background-color 0.2s, color 0.2s;
    min-height: 100vh;
    line-height: 1.6;
}

h1, h2, h3, h4 {
    color: var(--heading);
    margin: 16px 0 8px 0;
}

p { margin: 6px 0; }

table {
    border-collapse: collapse;
    margin: 12px 0;
    width: 100%;
    max-width: 600px;
    background-color: var(--table-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
th, td {
    border: 1px solid var(--border);
    padding: 10px 14px;
    text-align: center;
}
th {
    background-color: var(--primary);
    color: #fff;
}

a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}
a:hover { text-decoration: underline; }

button, input[type="submit"], input[type="reset"] {
    background-color: var(--primary);
    color: #fff;
    border: none;
    padding: 8px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: calc(var(--font-size) * 0.9);
    transition: filter 0.2s, transform 0.1s;
    margin: 4px 0;
}
button:hover { filter: brightness(0.85); }
button:active { transform: scale(0.97); }

input[type="text"], input[type="password"], input[type="number"] {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background-color: var(--input-bg);
    color: var(--text);
    font-size: var(--font-size);
}

ul, ol { padding-left: 24px; }

img {
    max-width: 300px;
    border-radius: var(--border-radius);
    border: 2px solid var(--border);
    margin: 8px 0;
}

blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 16px;
    margin: 12px 0;
    font-style: italic;
    color: var(--text);
    opacity: 0.8;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--nav-shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    z-index: 2000;
    transition: background 0.3s, border-color 0.3s;
    gap: 16px;
    flex-wrap: nowrap;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--heading);
    user-select: none;
    white-space: nowrap;
}
.navbar-brand .brand-icon { font-size: 1.6rem; }

.navbar-links {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    flex-shrink: 0;
}
.navbar-links li a {
    padding: 6px 14px;
    border-radius: var(--border-radius);
    color: var(--text);
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
    text-decoration: none;
    font-size: 0.95rem;
}
.navbar-links li a:hover {
    background: var(--primary);
    color: #fff;
    text-decoration: none;
}
.navbar-links li a.active {
    background: var(--primary);
    color: #fff;
}

/* 右侧操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* 搜索框 */
.search-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 2px 4px 2px 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.search-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 127, 189, 0.2);
}
.search-wrapper input[type="text"] {
    border: none;
    background: transparent;
    padding: 6px 0;
    font-size: 0.95rem;
    color: var(--text);
    outline: none;
    width: 140px;
    transition: width 0.2s;
}
.search-wrapper input[type="text"]:focus { width: 180px; }
.search-wrapper input[type="text"]::placeholder {
    color: var(--border);
    opacity: 0.7;
}
.search-wrapper .search-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 6px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: filter 0.2s;
    white-space: nowrap;
}
.search-wrapper .search-btn:hover { filter: brightness(0.88); }

/* 自定义按钮 */
.customize-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 8px 20px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: filter 0.2s, transform 0.15s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 8px rgba(59, 127, 189, 0.25);
    white-space: nowrap;
}
.customize-btn:hover {
    filter: brightness(0.88);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(59, 127, 189, 0.35);
}
.customize-btn:active { transform: scale(0.96); }

/* 自定义面板 */
.customize-panel {
    position: fixed;
    top: calc(var(--nav-height) + 12px);
    right: 32px;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 20px 24px;
    width: 300px;
    max-height: calc(100vh - var(--nav-height) - 40px);
    overflow-y: auto;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
    z-index: 1999;
    display: none;
    color: var(--text);
    transition: opacity 0.25s ease;
}
.customize-panel.open { display: block; }

.customize-panel h3 {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: 1.15rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.customize-panel h3 .close-panel-btn {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text);
    opacity: 0.5;
    padding: 0 4px;
    margin: 0;
    transition: opacity 0.2s;
}
.customize-panel h3 .close-panel-btn:hover {
    opacity: 1;
    filter: none;
    transform: none;
}

.ctrl-group { margin-bottom: 14px; }
.ctrl-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 3px;
}
.ctrl-group input[type="color"] {
    width: 100%;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background: transparent;
    cursor: pointer;
}
.ctrl-group input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}
.ctrl-group .value-display {
    float: right;
    font-size: 0.8rem;
    opacity: 0.7;
}

.reset-btn {
    background: #e74c3c;
    color: #fff;
    border: none;
    padding: 6px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    margin-top: 4px;
    font-size: 0.9rem;
    transition: filter 0.2s;
}
.reset-btn:hover { filter: brightness(0.85); }

.customize-panel::-webkit-scrollbar {
    width: 5px;
}
.customize-panel::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

/* 搜索高亮（如果你保留了当前页高亮） */
.search-highlight {
    background-color: #ffff99 !important;
    color: #1a2332 !important;
    border-radius: 2px;
    padding: 0 2px;
}

/* 搜索结果提示 */
#searchResultInfo {
    position: fixed;
    top: calc(var(--nav-height) + 12px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    padding: 8px 24px;
    border-radius: 50px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    z-index: 3000;
    font-size: 0.95rem;
    display: none;
    color: var(--text);
    transition: opacity 0.3s;
    pointer-events: none;
}
#searchResultInfo.show { display: block; }

/* 响应式 */
@media (max-width: 850px) {
    .navbar {
        padding: 0 16px;
        flex-wrap: wrap;
        height: auto;
        min-height: var(--nav-height);
        padding-top: 8px;
        padding-bottom: 8px;
    }
    body { padding-top: calc(var(--nav-height) + 60px); }
    .navbar-links {
        order: 3;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 4px;
        margin-top: 4px;
    }
    .nav-actions { flex: 1; justify-content: flex-end; }
    .search-wrapper input[type="text"] { width: 100px; }
    .search-wrapper input[type="text"]:focus { width: 130px; }
}

@media (max-width: 500px) {
    .navbar-brand span { display: none; }
    .navbar-links li a { padding: 4px 8px; font-size: 0.8rem; }
    .search-wrapper input[type="text"] { width: 70px; font-size: 0.8rem; }
    .search-wrapper input[type="text"]:focus { width: 100px; }
    .search-wrapper .search-btn { padding: 4px 10px; font-size: 0.75rem; }
    .customize-btn { padding: 4px 12px; font-size: 0.8rem; }
    .customize-btn span { display: none; }
}
/* ==========================================
   卡片样式 (Card Styles)
   ========================================== */

/* 1. 单个卡片容器 */
.card {
    background: var(--card-bg);          /* 跟随主题背景 */
    border: 1px solid var(--border);      /* 跟随主题边框 */
    border-radius: var(--border-radius);  /* 跟随主题圆角 */
    padding: 0;                           /* 内边距由内部元素控制 */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06); /* 轻微阴影增加立体感 */
    transition: transform 0.25s ease, box-shadow 0.3s ease;
    overflow: hidden;                    /* 保证圆角裁切图片 */
    display: flex;
    flex-direction: column;              /* 内容垂直排列 */
    height: 100%;                        /* 保证同一网格内等高 */
}

/* 2. 鼠标悬停效果（提升交互感） */
.card:hover {
    transform: translateY(-6px);         /* 轻轻浮起 */
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
    border-color: var(--primary);        /* 边框变为主色 */
}

/* 3. 卡片图片（铺满顶部） */
.card-img {
    width: 100%;
    height: 200px;                       /* 固定高度，方便统一 */
    object-fit: cover;                  /* 图片裁剪居中，不变形 */
    display: block;
    background-color: var(--border);    /* 图片加载前的占位色 */
}

/* 4. 卡片内容区域（文字部分） */
.card-body {
    padding: 18px 20px 20px;
    flex: 1;                            /* 自动撑满剩余空间 */
    display: flex;
    flex-direction: column;
}

.card-body h3 {
    margin: 0 0 8px 0;
    font-size: 1.2rem;
    color: var(--heading);
}

.card-body p {
    margin: 0 0 12px 0;
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.5;
    flex: 1;                            /* 把按钮推向底部 */
}

/* 5. 卡片上的按钮（如果有） */
.card-body .card-btn {
    align-self: flex-start;             /* 按钮左对齐，不拉伸 */
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 6px 18px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: filter 0.2s;
    text-decoration: none;
    display: inline-block;
}
.card-body .card-btn:hover {
    filter: brightness(0.85);
    text-decoration: none;
}

/* ===== 卡片网格布局 ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;                          /* 卡片之间的间距 */
    margin: 20px 0 30px;
}

/* 针对小屏幕优化 */
@media (max-width: 600px) {
    .card-grid {
        grid-template-columns: 1fr;      /* 手机上一列显示 */
        gap: 16px;
    }
    .card-img {
        height: 160px;
    }
}

/* 1. 现代浏览器顶级过渡（Chrome/Edge） */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: 0.3s ease-out both fade-out; }
::view-transition-new(root) { animation: 0.35s ease-in both fade-in; }

/* 2. 全浏览器兜底入场动画（Firefox/Safari/旧版） */
@keyframes pageFadeIn {
    0% { opacity: 0; transform: translateY(8px); }
    100% { opacity: 1; transform: translateY(0); }
}
body {
    animation: pageFadeIn 0.35s ease-out forwards;
}

/* 共用关键帧 */
@keyframes fade-out { from { opacity: 1; } to { opacity: 0; } }
@keyframes fade-in { from { opacity: 0; transform: scale(0.98); } to { opacity: 1; transform: scale(1); } }


#search {
    position: relative;
    display: inline-block;
    /* 保持与之前相同的宽度 */
}




/* 搜索结果下拉面板：绝对定位，脱离文档流 */
.pagefind-ui__drawer {
    position: absolute !important;
    top: calc(100% + 8px) !important;  /* 位于搜索框下方 */
    left: 0 !important;
    right: 0 !important;
    min-width: 300px !important;       /* 确保有足够宽度 */
    background: var(--card-bg) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--border-radius) !important;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15) !important;
    z-index: 9999 !important;
    max-height: 400px !important;
    overflow-y: auto !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 8px 0 !important;
}

/* 调整下拉面板内的文本颜色，跟随主题 */
.pagefind-ui__result {
    color: var(--text) !important;
}
.pagefind-ui__result-link {
    color: var(--accent) !important;
}
.pagefind-ui__result-title {
    color: var(--heading) !important;
}
.pagefind-ui__result-excerpt {
    color: var(--text) !important;
    opacity: 0.8;
}

/* ===== Pagefind 搜索框主题适配 ===== */
/* 搜索框容器 */
#search {
    width: 200px; /* 或根据需要调整 */
}

/* 输入框 */
.pagefind-ui__search-input {
    background: var(--input-bg) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--border-radius) !important;
    outline: none !important;
    box-shadow: none !important;
}

.pagefind-ui__search-input::placeholder {
    color: var(--border) !important;
    opacity: 0.7;
}

.pagefind-ui__search-input:focus {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 3px rgba(59, 127, 189, 0.2) !important;
}

/* 隐藏默认搜索按钮（可选） */
.pagefind-ui__search-button {
    display: none !important;
}

/* 下拉结果面板 */
.pagefind-ui__drawer {
    position: absolute !important;
    top: calc(100% + 8px) !important;
    left: 0 !important;
    right: 0 !important;
    min-width: 280px !important;
    background: var(--card-bg) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--border-radius) !important;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12) !important;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 6px 0 !important;
    max-height: 400px !important;
    overflow-y: auto !important;
    z-index: 9999 !important;
}

/* 结果项 */
.pagefind-ui__result {
    padding: 8px 16px !important;
    color: var(--text) !important;
}

.pagefind-ui__result-link {
    color: var(--accent) !important;
    text-decoration: none;
}

.pagefind-ui__result-title {
    color: var(--heading) !important;
    font-weight: 600;
}

.pagefind-ui__result-excerpt {
    color: var(--text) !important;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 选中/悬停效果 */
.pagefind-ui__result:hover {
    background: var(--primary) !important;
    color: #fff !important;
}
.pagefind-ui__result:hover .pagefind-ui__result-link,
.pagefind-ui__result:hover .pagefind-ui__result-title,
.pagefind-ui__result:hover .pagefind-ui__result-excerpt {
    color: #fff !important;
}

/* 滚动条匹配主题 */
.pagefind-ui__drawer::-webkit-scrollbar {
    width: 6px;
}
.pagefind-ui__drawer::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

.toc {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 20px 28px;
    margin: 20px 0 30px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.toc h2 {
    margin: 0 0 12px 0;
    font-size: 1.2rem;
    color: var(--heading);
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
}

.toc ul li {
    margin: 0;
}

.toc ul li a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s;
}

.toc ul li a:hover {
    border-bottom-color: var(--primary);
    text-decoration: none;
}

/* 小屏幕时目录垂直排列 */
@media (max-width: 600px) {
    .toc ul {
        flex-direction: column;
        gap: 6px;
    }
}

css
html {
    scroll-behavior: smooth;
}

.row {
    display: flex;
    align-items: center;  /* 垂直居中（可选） */
    gap: 10px;            /* 两个元素之间的间距（可选） */
}

.back-top-btn {
    position: fixed;
    bottom: 100px;      /* 在“个性化”按钮上方，避免重叠 */
    right: 30px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 10px 18px;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    z-index: 999;
    transition: opacity 0.3s, transform 0.2s;
    opacity: 0;         /* 默认隐藏 */
    pointer-events: none;
}
.back-top-btn.show {
    opacity: 1;
    pointer-events: auto;
}
.back-top-btn:hover {
    filter: brightness(0.85);
    transform: scale(1.05);
}
.back-btn {
    display: inline-block;
    padding: 8px 20px;
    margin: 16px 0;
    background: var(--primary);
    color: #fff;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s, transform 0.15s;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}
.back-btn:hover {
    filter: brightness(0.85);
    transform: translateX(-4px); /* 向左微移，增加动感 */
    text-decoration: none;
}