/* --- 1. CSS 变量定义 (主题颜色) --- */
:root {
    /* 浅色主题 (默认) */
    --bg-color: #ffffff;
    --text-color: #333333;
    --sidebar-bg: #f8f9fa;
    --link-color: #007bff;
    --link-hover: #0056b3;
    --border-color: #e9ecef;
    --meta-color: #666;
    --heading-color: #222;
}

/* 深色主题类 */
body.dark-mode {
    --bg-color: #1e1e1e;
    --text-color: #e0e0e0;
    --sidebar-bg: #252a34;
    --link-color: #61dafb;
    --link-hover: #21a1c4;
    --border-color: #333;
    --meta-color: #a0a0a0;
    --heading-color: #fff;
}

/* --- 2. 全局样式 --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

ul,
ol {
    list-style-position: outside;
    padding-left: 1.2em;
    margin-left: 0;
}

li {
    margin-top: 0.5em;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

h1,
h2 {
    color: var(--heading-color);
    margin-bottom: 1rem;
}

h3 {
    color: var(--heading-color);
    margin-top: 1rem;
    margin-bottom: 1rem;
}

/* --- 3. 布局 (Grid Layout) --- */
.container {
    display: grid;
    grid-template-columns: 280px 1fr;
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
}

/* --- 4. 侧边栏样式 --- */
.sidebar {
    background-color: var(--sidebar-bg);
    padding: 2rem;
    border-right: 1px solid var(--border-color);
    text-align: center;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    transition: background-color 0.3s;
}

.avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1rem;
    border: 4px solid var(--bg-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.name {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.bio {
    font-size: 0.9rem;
    color: var(--meta-color);
    margin-bottom: 1rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.9rem;
    margin-top: 1.5rem;
}

.contact-links a {
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.contact-links a:hover {
    color: var(--link-color);
}

.btn-cv {
    margin-top: 10px;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
}

/* --- 5. 主内容区样式 --- */
.main-content {
    padding: 3rem 4rem;
    max-width: 800px;
}

.highlight-content {
    font-style: italic;
    font-weight: bold;
}

.highlight-content:lang(zh) {
    font-style: normal;
    font-family: "Baskerville", "Georgia", "KaiTi", "STKaiti", "Songti SC",
        "Noto Serif CJK SC", serif;
}

/* --- 6. 主题切换按钮 --- */
.theme-toggle-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
}

#theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
}

#theme-toggle:hover {
    background-color: var(--border-color);
}

/* --- 7. 移动端响应式 --- */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr; /* 变为单列 */
    }

    .sidebar {
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 2rem 1rem;
    }

    .main-content {
        padding: 2rem 1.5rem;
    }
}