:root {
    --main-color: #0d9488;
    --submain-color: #f0fdfa;
    --main-dark: color-mix(in srgb, var(--main-color), black 15%);
    --main-darker: color-mix(in srgb, var(--main-color), black 30%);
    --main-light: color-mix(in srgb, var(--main-color), white 25%);
    --main-lighter: color-mix(in srgb, var(--main-color), white 85%);
    --main-lightest: color-mix(in srgb, var(--main-color), white 95%);
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 6px 16px rgba(0, 0, 0, 0.06);
    --card-shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.08), 0 12px 28px rgba(0, 0, 0, 0.1);
    --nav-height: 60px;
    /* 主题相关变量 */
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #1a1a2e;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --table-border: #e2e8f0;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --font-serif: 'Playfair Display', 'Noto Serif SC', Georgia, 'Times New Roman', serif;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== 暗色主题 ========== */
[data-theme="dark"] {
    --main-color: #2dd4bf;
    --submain-color: #0f172a;
    --main-dark: color-mix(in srgb, var(--main-color), black 20%);
    --main-darker: color-mix(in srgb, var(--main-color), black 40%);
    --main-light: color-mix(in srgb, var(--main-color), black 30%);
    --main-lighter: color-mix(in srgb, var(--main-color), black 75%);
    --main-lightest: color-mix(in srgb, var(--main-color), black 85%);
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 8px 24px rgba(0, 0, 0, 0.25);
    --card-shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.3), 0 16px 36px rgba(0, 0, 0, 0.35);
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --table-border: #334155;
}

/* ========== 全局基础样式 ========== */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    overflow-y: scroll;
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.body-container {
    margin: auto;
    min-height: 100vh;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal);
}

/* ========== 欢迎横幅 ========== */
.welcome {
    width: 100%;
    height: 100px;
    background: linear-gradient(135deg, var(--main-color), var(--main-light));
    color: white;
    font-family: var(--font-serif);
    font-weight: 700;
    font-style: italic;
    font-size: 36px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

/* ========== 导航栏 ========== */
nav {
    width: 100%;
    height: var(--nav-height);
    background: linear-gradient(135deg, var(--main-color), var(--main-dark));
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: white;
    margin-bottom: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    position: sticky; /* sticky 自带 relative 定位上下文 */
    top: 0;
    z-index: 1000;
}

nav > ul {
    list-style-type: none;
    width: calc(100% - 60px); /* 为右侧主题切换按钮留出空间 */
    height: 100%;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-around;
}

nav > ul > li {
    position: relative; /* 为绝对定位的二级菜单提供参照物 */
    width: 15%;
    background-color: transparent;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

/* 链接通用样式 */
nav ul li a {
    color: white;
    width: 100%;
    height: var(--nav-height);
    padding: 0;
    font-size: 18px;
    font-weight: 500;
    text-decoration: none;
    display: flex;
    justify-content: center;
    align-items: center;
    letter-spacing: 0.3px;
    transition: background-color var(--transition-fast), opacity var(--transition-fast);
}

nav > ul > li > a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
}

nav ul ul {
    display: none;
    position: absolute; /* 绝对定位，脱离文档流 */
    top: 100%;           /* 位于父元素底部 */
    background: linear-gradient(180deg, var(--main-dark), color-mix(in srgb, var(--main-dark), black 10%));
    list-style-type: none;
    width: 100%;
    padding: 6px 0;
    z-index: 1000;       /* 确保浮在其他内容之上 */
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: hidden;
}

nav ul ul li {
    width: 100%;
}

nav ul ul li a {
    font-size: 15px;
    font-weight: 400;
    padding: 0 16px;
    height: 44px;
    transition: background-color var(--transition-fast), padding-left var(--transition-fast);
}

nav ul ul li a:hover {
    background-color: rgba(255, 255, 255, 0.12);
    padding-left: 24px;
}

nav ul li:hover > ul {
    display: block;
}

/* ========== 主内容区域 ========== */
.main-container {
    width: 100%;
    display: flex;
    justify-content: space-evenly;
    flex: 1;
}

/* ========== 左侧目录栏 ========== */
.left-container {
    width: 20%;
    height: min-content;
    border-radius: var(--radius-lg);
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    display: inline-block;
    position: sticky;
    top: calc(var(--nav-height) + 40px);
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 2;
    padding: 8px 0;
    transition: box-shadow var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
}

.left-container:hover {
    box-shadow: var(--card-shadow-hover);
}

.left-container a {
    text-decoration: none;
    color: var(--main-darker);
    transition: color var(--transition-fast), font-weight var(--transition-fast);
}

.left-container a:hover {
    font-weight: 600;
    color: var(--main-color);
}

/* ========== 中间内容区 ========== */
.middle-container {
    width: 45%;
    height: 100%;
    padding: 32px 36px;
    border-radius: var(--radius-lg);
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    display: inline-block;
    font-size: 16px;
    transition: box-shadow var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
}

/* ========== 右侧个人信息卡片 ========== */
.right-container {
    width: 20%;
    height: min-content;
    border-radius: var(--radius-lg);
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    position: sticky;
    top: calc(var(--nav-height) + 40px);
    padding: 32px 16px 24px;
    transition: box-shadow var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
}

.right-container:hover {
    box-shadow: var(--card-shadow-hover);
}

.right-container > img {
    width: 150px;
    height: 150px;
    transition: transform var(--transition-normal);
}

.right-container > img:hover {
    transform: scale(1.05);
}

.right-container > p {
    font-size: 24px;
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: 0.5px;
}

/* ========== 个人简介 ========== */
.profile-bio {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: -8px;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

/* ========== 技能标签 ========== */
.profile-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    padding: 0 16px;
    margin-bottom: 8px;
}

.tag {
    display: inline-block;
    padding: 4px 14px;
    font-size: 12px;
    font-weight: 500;
    color: var(--main-color);
    background-color: var(--main-lightest);
    border: 1px solid var(--main-lighter);
    border-radius: 20px;
    letter-spacing: 0.3px;
    cursor: default;
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.tag:hover {
    background-color: var(--main-color);
    color: white;
    transform: translateY(-1px);
}

/* ========== 分隔线 ========== */
.profile-divider {
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: 12px 0;
}

/* ========== 个人格言 ========== */
.profile-quote {
    padding: 0 20px;
    text-align: center;
}

.profile-quote p {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.personl-info {
    margin-inline: auto;
    width: 80%;
    height: auto;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 4px 0;
}

.personl-info .info-ico,
.personl-info .info-text {
    width: 50%;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.personl-info a {
    text-decoration: none;
    color: var(--main-darker);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.personl-info a:hover {
    font-weight: 700;
    color: var(--main-color);
}

/* ========== 页脚 ========== */
footer {
    margin-top: 40px;
    width: 100%;
    height: 56px;
    background: linear-gradient(135deg, var(--main-color), var(--main-dark));
    color: rgba(255, 255, 255, 0.9);
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.3px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: sticky;
    top: calc(100vh - 80px);
}

/* ========== 文章排版 ========== */
.middle-container h1 {
    font-family: var(--font-serif);
    font-weight: 800;
    font-size: 42px;
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--main-darker), var(--main-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.middle-container h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 30px;
    letter-spacing: -0.3px;
    margin-top: 40px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--main-lighter);
}

.middle-container h3 {
    font-weight: 600;
    font-size: 22px;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--main-dark);
}

.middle-container h4 {
    font-weight: 600;
    font-size: 18px;
    margin-top: 24px;
    margin-bottom: 8px;
}

/* 修复锚点跳转时标题被 sticky 导航栏遮挡的问题 */
.middle-container h1,
.middle-container h2,
.middle-container h3,
.middle-container h4,
.middle-container h5,
.middle-container h6 {
    scroll-margin-top: calc(var(--nav-height) + 20px);
}

.middle-container p {
    margin-bottom: 16px;
    color: var(--text-color);
}

.middle-container a {
    color: var(--main-color);
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--main-color), transparent 60%);
    text-underline-offset: 3px;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.middle-container a:hover {
    color: var(--main-darker);
    text-decoration-color: var(--main-darker);
    text-decoration-thickness: 2px;
}

/* ========== 行内代码 ========== */
.middle-container code:not(pre code) {
    margin-inline: 2px;
    padding: 2px 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--main-lightest);
    font-family: var(--font-mono);
    font-size: 0.88em;
    color: var(--main-darker);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

/* ========== 代码块 ========== */
.middle-container .hljs {
    display: block;
    overflow: auto;
    padding: 20px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--main-lightest);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

/* ========== 表格 ========== */
.middle-container table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: 20px 0;
    border: 1px solid var(--table-border);
}

.middle-container th {
    padding: 14px 16px;
    background-color: var(--main-lighter);
    font-weight: 600;
    font-size: 15px;
    text-align: left;
    border-bottom: 2px solid var(--main-color);
    color: var(--text-color);
}

.middle-container td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--table-border);
    font-size: 15px;
    transition: background-color var(--transition-fast);
}

.middle-container tr:last-child td {
    border-bottom: none;
}

.middle-container tbody tr:hover td {
    background-color: var(--main-lightest);
}

.middle-container td:first-child,
.middle-container th:first-child {
    border-left: none;
}

.middle-container td:last-child,
.middle-container th:last-child {
    border-right: none;
}

/* ========== 引用块 ========== */
.middle-container blockquote {
    background-color: var(--main-lightest);
    border-left: 4px solid var(--main-color);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 16px 20px;
    margin: 20px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.middle-container blockquote p {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.middle-container blockquote p:last-child {
    margin-bottom: 0;
}

/* ========== 水平线 ========== */
.middle-container hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--main-lighter), var(--main-color), var(--main-lighter), transparent);
    margin: 40px 0;
}

/* ========== 列表 ========== */
.middle-container ul,
.middle-container ol {
    padding-left: 24px;
    margin-bottom: 16px;
}

.middle-container li {
    margin-bottom: 8px;
    line-height: 1.8;
}

/* ========== 主题切换按钮样式 ========== */
.theme-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
    line-height: 1;
    padding: 0;
    transition: border-color var(--transition-fast), transform var(--transition-fast), background-color var(--transition-fast);
    z-index: 1100;
}

.theme-toggle:hover {
    border-color: white;
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1) rotate(15deg);
}

/* 暗色主题下右侧容器图片反色 */
[data-theme="dark"] .right-container > img {
    filter: invert(1);
}

/* 暗色主题下链接颜色调亮 */
[data-theme="dark"] .middle-container a {
    color: color-mix(in srgb, var(--main-color), white 20%);
}

[data-theme="dark"] .left-container a {
    color: color-mix(in srgb, var(--main-color), white 20%);
}

[data-theme="dark"] .personl-info a {
    color: color-mix(in srgb, var(--main-color), white 20%);
}

/* 暗色主题下 h1 渐变色适配 */
[data-theme="dark"] .middle-container h1 {
    background: linear-gradient(135deg, var(--main-color), color-mix(in srgb, var(--main-color), white 30%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 暗色主题下 h3 颜色适配 */
[data-theme="dark"] .middle-container h3 {
    color: var(--main-color);
}

/* ========== 汉堡菜单按钮样式 ========== */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1100;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    margin: 6px 0;
    background-color: white;
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* 汉堡菜单激活状态（X 形） */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* ========== 选中文本样式 ========== */
::selection {
    background-color: color-mix(in srgb, var(--main-color), transparent 70%);
    color: var(--text-color);
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--main-color), transparent 50%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--main-color);
}

/* ========== 响应式设计：平板（≤1024px） ========== */
@media (max-width: 1024px) {
    .left-container {
        display: none;
    }
    .middle-container {
        width: 60%;
    }
    .right-container {
        width: 25%;
    }
    .welcome {
        font-size: 28px;
        height: 80px;
    }
    nav > ul > li {
        width: 18%;
    }
    nav ul li a {
        font-size: 16px;
    }
}

/* ========== 响应式设计：小平板/大手机（≤768px） ========== */
@media (max-width: 768px) {
    :root {
        --nav-height: 50px;
    }
    .welcome {
        font-size: 20px;
        height: 60px;
        flex-direction: column;
        justify-content: center;
        gap: 2px;
    }
    .welcome-item {
        font-size: 16px;
    }
    /* 显示汉堡菜单按钮 */
    .hamburger {
        display: block;
        position: absolute;
        left: 15px;
        top: 50%;
        transform: translateY(-50%);
    }
    nav {
        margin-bottom: 20px;
        justify-content: center;
    }
    /* 导航菜单默认隐藏，变为垂直布局 */
    nav > ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: linear-gradient(180deg, var(--main-color), var(--main-dark));
        box-shadow: 0 12px 28px rgba(0, 0, 0, 0.2);
        z-index: 1000;
    }
    nav > ul.show {
        display: flex;
    }
    nav > ul > li {
        width: 100%;
        border-radius: 0;
    }
    nav ul li a {
        height: var(--nav-height);
        font-size: 16px;
        justify-content: flex-start;
        padding-left: 20px;
    }
    nav ul ul {
        position: static;
        box-shadow: none;
        border-radius: 0;
    }
    nav ul ul li a {
        padding-left: 40px;
        height: 44px;
        font-size: 14px;
    }
    /* 主内容区域改为单栏 */
    .main-container {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    .left-container {
        display: none;
    }
    .middle-container {
        width: 90%;
        padding: 20px;
    }
    .right-container {
        width: 90%;
        height: auto;
        padding: 20px;
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 10px;
    }
    .right-container > img {
        width: 100px;
        height: 100px;
    }
    .right-container > p {
        font-size: 20px;
        margin: 0;
    }
    .personl-info {
        width: auto;
        height: auto;
    }
    .middle-container h1 {
        font-size: 30px;
    }
    .middle-container h2 {
        font-size: 24px;
    }
    footer {
        flex-direction: column;
        height: auto;
        padding: 12px;
        font-size: 13px;
        gap: 4px;
    }
}

/* ========== 响应式设计：手机（≤480px） ========== */
@media (max-width: 480px) {
    .welcome {
        font-size: 15px;
        height: 50px;
    }
    .welcome-item {
        font-size: 13px;
    }
    .middle-container {
        width: 95%;
        padding: 14px;
        font-size: 15px;
    }
    .middle-container h1 {
        font-size: 24px;
    }
    .middle-container h2 {
        font-size: 20px;
    }
    .middle-container .hljs {
        padding: 12px;
        font-size: 13px;
    }
    .right-container {
        width: 95%;
    }
    .right-container > img {
        width: 80px;
        height: 80px;
    }
    .right-container > p {
        font-size: 16px;
    }
    nav ul li a {
        font-size: 14px;
        height: 44px;
    }
    footer {
        font-size: 12px;
    }
}