/* 基本重置 */
:root {
    --bg-color: #f5f5f5;
    --text-color: #333;
    --header-bg: #fff;
    --nav-text: #34495e;
    --nav-hover: #3498db;
    --card-bg: #f9f9f9;
    --card-hover-bg: #fff;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --border-color: #eee;
    --border-focus: #3498db;
    --title-color: #2c3e50;
    --meta-color: #7f8c8d;
    --content-text: #555;
    --footer-bg: #2c3e50;
    --footer-text: #fff;
    --code-bg: #f8f9fa;
    --modal-bg: rgba(0, 0, 0, 0.5);
    --input-border: #ddd;
    --btn-primary-bg: #fff;
    --btn-primary-text: #667eea;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --header-bg: #1e1e1e;
    --nav-text: #b3b3b3;
    --nav-hover: #64b5f6;
    --card-bg: #1e1e1e;
    --card-hover-bg: #2c2c2c;
    --card-shadow: rgba(0, 0, 0, 0.5);
    --border-color: #333;
    --border-focus: #64b5f6;
    --title-color: #ffffff;
    --meta-color: #9e9e9e;
    --content-text: #cccccc;
    --footer-bg: #111111;
    --footer-text: #e0e0e0;
    --code-bg: #2d2d2d;
    --modal-bg: rgba(0, 0, 0, 0.8);
    --input-border: #444;
    --btn-primary-bg: #2c2c2c;
    --btn-primary-text: #64b5f6;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* 头部样式 */
.header {
    background-color: var(--header-bg);
    box-shadow: 0 2px 10px var(--card-shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background-color 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--title-color);
}

.nav-list {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-item {
    margin-left: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--nav-text);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--nav-hover);
}

/* 主要内容区域 */
.main {
    margin-top: 80px;
}

/* 英雄区域 */
.hero {
    /* 直接设置背景图片，不带任何颜色遮罩 */
    background: url('hero-bg.png') center/cover no-repeat;
    color: #fff;
    padding: 120px 0;
    text-align: center;
    position: relative;
    /* 关键：使用 mask-image 让图片本身向底部渐变淡出，融入背景 */
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 60%, rgba(0,0,0,0) 100%);
    mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 60%, rgba(0,0,0,0) 100%);
}

.hero-title {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.6);
    min-height: 30px; /* 防止打字机动画时高度塌陷 */
}

/* 打字机光标动画 */
.typewriter-cursor {
    display: inline-block;
    width: 3px;
    background-color: #fff;
    margin-left: 2px;
    animation: blink 0.7s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--card-shadow);
}

.btn-secondary {
    background-color: #3498db;
    color: #fff;
}

.btn-secondary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

/* 章节标题 */
.section-title {
    font-size: 36px;
    margin-bottom: 40px;
    text-align: center;
    color: var(--title-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--nav-hover);
}

/* 博客区域 */
.blog-section {
    padding: 80px 0;
    background-color: var(--header-bg);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.blog-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px var(--card-shadow);
    background-color: var(--card-hover-bg);
}

.blog-card-content {
    padding: 30px;
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    color: var(--meta-color);
    font-size: 14px;
}

.blog-title {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--title-color);
}

.blog-link {
    text-decoration: none;
    color: var(--title-color);
    transition: color 0.3s ease;
}

.blog-link:hover {
    color: var(--nav-hover);
}

.blog-excerpt {
    color: var(--content-text);
    margin-bottom: 20px;
    line-height: 1.8;
}

/* 知识专栏区域 */
.categories-section {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.category-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 30px 20px;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    box-shadow: 0 5px 15px var(--card-shadow);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-10px);
    border-color: var(--nav-hover);
    box-shadow: 0 15px 30px rgba(52, 152, 219, 0.2);
}

.category-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.category-name {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--title-color);
}

.category-desc {
    font-size: 14px;
    color: var(--meta-color);
}

/* 关于我区域 */
.about-section {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text {
    font-size: 18px;
    line-height: 1.8;
    color: var(--content-text);
}

.about-text p {
    margin-bottom: 20px;
}

.skills-list {
    list-style: none;
    background-color: var(--header-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--card-shadow);
}

.skills-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--nav-text);
}

.skills-list li:last-child {
    border-bottom: none;
}

/* 联系区域 */
.contact-section {
    padding: 80px 0;
    background-color: var(--header-bg);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    font-size: 18px;
    line-height: 2;
    color: var(--content-text);
}

.contact-info a {
    color: var(--nav-hover);
    text-decoration: none;
}

.contact-info a:hover {
    text-decoration: underline;
}

.contact-form {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--card-shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--nav-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    font-size: 16px;
    font-family: inherit;
    background-color: var(--header-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

/* 页脚 */
.footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 40px 0;
}

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

.social-links {
    display: flex;
    gap: 20px;
}

.social-link {
    color: var(--footer-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--nav-hover);
}

/* 文章详情页面样式 */
.article-detail {
    padding: 80px 0;
    background-color: var(--header-bg);
}

.article-header {
    text-align: center;
    margin-bottom: 50px;
}

.article-title {
    font-size: 42px;
    color: var(--title-color);
    margin-bottom: 20px;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 30px;
    color: var(--meta-color);
    font-size: 16px;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 18px;
    line-height: 1.8;
    color: var(--content-text);
    /* 关键属性：保留源码中的空格和换行符，实现所见即所得 */
    white-space: pre-wrap;
    word-wrap: break-word;
}

.article-content h2 {
    font-size: 32px;
    color: var(--title-color);
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.article-content h3 {
    font-size: 26px;
    color: var(--nav-text);
    margin: 30px 0 15px;
}

.article-content p {
    margin-bottom: 20px;
}

.article-content ul {
    margin-bottom: 20px;
    padding-left: 30px;
}

.article-content li {
    margin-bottom: 10px;
}

.article-content pre {
    background-color: var(--code-bg);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.article-content code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 16px;
    color: var(--text-color);
}

.article-nav {
    max-width: 800px;
    margin: 50px auto 0;
    display: flex;
    justify-content: space-between;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

.article-nav-link {
    color: var(--nav-hover);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.article-nav-link:hover {
    color: var(--border-focus);
    text-decoration: underline;
}

/* 文章列表页面样式 */
.articles-section {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.articles-container {
    width: 100%;
    padding: 0 40px; /* 左右留一点边距 */
    margin: 0 auto;
}

/* 左右分栏布局 -> 三栏布局 */
.articles-layout {
    display: grid;
    /* 左侧列表300px，中间内容自适应，右侧大纲250px */
    grid-template-columns: 300px 1fr 250px;
    gap: 40px;
    margin-top: 40px;
}

/* 左侧文章列表 */
.articles-sidebar {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px var(--card-shadow);
    height: fit-content;
    position: sticky;
    top: 120px;
}

.articles-list h3 {
    font-size: 20px;
    color: var(--title-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.article-item {
    margin-bottom: 15px;
}

.article-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background-color: var(--header-bg);
    border-radius: 8px;
    text-decoration: none;
    color: var(--nav-text);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.article-link:hover {
    background-color: var(--card-hover-bg);
    border-color: var(--nav-hover);
    transform: translateX(5px);
}

.article-link.active {
    background-color: var(--card-hover-bg);
    border-color: var(--nav-hover);
    color: var(--nav-hover);
}

.article-item-title {
    font-weight: 500;
    flex: 1;
}

.article-item-date {
    font-size: 14px;
    color: var(--meta-color);
    margin-left: 15px;
}

/* 中间文章内容 */
.articles-content {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px var(--card-shadow);
    min-height: 500px;
}

.article-modify {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
    color: var(--meta-color);
    font-size: 16px;
}

.article-actions {
    margin-top: 20px;
    display: flex;
    gap: 15px;
}

/* 右侧 TOC 大纲 */
.articles-toc {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px var(--card-shadow);
    height: fit-content;
    position: sticky;
    top: 120px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.toc-container h3 {
    font-size: 18px;
    color: var(--title-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

#toc-list {
    list-style: none;
    padding: 0;
}

.toc-item {
    margin-bottom: 10px;
}

.toc-h2 {
    margin-left: 0;
}

.toc-h3 {
    margin-left: 15px;
    font-size: 0.9em;
}

.toc-item a {
    color: var(--nav-text);
    text-decoration: none;
    transition: color 0.3s ease;
    display: block;
    line-height: 1.4;
}

.toc-item a:hover,
.toc-item a.active {
    color: var(--nav-hover);
    font-weight: 500;
}

/* 搜索框样式 */
.search-box {
    margin-bottom: 20px;
}

.search-box input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 14px;
    background-color: var(--header-bg);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* 主题切换按钮 */
.theme-toggle {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    margin-left: 20px;
    color: var(--nav-text);
    transition: color 0.3s ease;
}

.theme-toggle:hover {
    color: var(--nav-hover);
}

/* 编辑模式样式 */
.article-content.editing {
    background-color: var(--header-bg);
    padding: 20px;
    border-radius: 8px;
    outline: 2px solid var(--nav-hover);
}

.article-content.editing:focus {
    outline: 2px solid var(--border-focus);
}

/* 新文章编辑器样式 */
#new-article-editor {
    background-color: var(--header-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--card-shadow);
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.editor-header h3 {
    margin: 0;
    color: var(--title-color);
    font-size: 24px;
}

#new-article-editor .form-group {
    margin-bottom: 25px;
}

#new-article-editor .form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--nav-text);
    font-size: 16px;
}

#new-article-editor .form-group input,
#new-article-editor .form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    background-color: var(--header-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease;
}

#new-article-editor .form-group input:focus,
#new-article-editor .form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

#new-article-editor .form-group textarea {
    resize: vertical;
    min-height: 300px;
    line-height: 1.6;
}

#new-article-editor .form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
}

#new-article-editor .form-actions .btn {
    padding: 12px 30px;
    font-size: 16px;
    cursor: pointer;
}

/* 响应式设计 */
@media (max-width: 768px) {
    #new-article-editor {
        padding: 20px;
    }
    
    .editor-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    #new-article-editor .form-actions {
        flex-direction: column;
    }
}

/* 创建新文章按钮样式 */
.create-article-btn {
    display: block;
    width: 100%;
    margin-bottom: 20px;
    padding: 12px;
    font-size: 16px;
    cursor: pointer;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-bg);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--header-bg);
    margin: 5% auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px var(--card-shadow);
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 2px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--title-color);
    font-size: 24px;
}

.close-modal {
    font-size: 30px;
    font-weight: bold;
    color: var(--meta-color);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-modal:hover {
    color: var(--nav-text);
}

.modal-body {
    padding: 30px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--nav-text);
    font-size: 16px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    background-color: var(--header-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 200px;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.form-actions .btn {
    padding: 12px 30px;
    font-size: 16px;
    cursor: pointer;
}

/* 悬浮快捷菜单 */
.floating-menu {
    position: fixed;
    bottom: 40px;
    right: 40px;
    z-index: 1500;
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: 15px;
}

.floating-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background-color: var(--card-bg);
    color: var(--text-color);
    box-shadow: 0 4px 15px var(--card-shadow);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.floating-btn.main-btn {
    width: 60px;
    height: 60px;
    background-color: var(--nav-hover);
    color: white;
    font-size: 30px;
    z-index: 2;
}

.floating-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.floating-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
    position: absolute;
    bottom: 70px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.floating-menu.active .floating-actions {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.floating-menu.active .main-btn {
    transform: rotate(45deg);
}

/* 标签样式 */
.blog-tags span {
    display: inline-block;
    padding: 2px 8px;
    background: var(--nav-hover);
    color: #fff;
    border-radius: 4px;
    font-size: 12px;
}

/* 友情链接悬浮效果 */
.friend-card:hover {
    transform: translateY(-5px) !important;
    box-shadow: 0 5px 15px var(--card-shadow) !important;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .modal-header,
    .modal-body {
        padding: 20px;
    }
    
    .form-actions {
        flex-direction: column;
    }
}

/* 响应式设计 */
@media (max-width: 992px) {
    .articles-layout {
        grid-template-columns: 1fr;
    }
    
    .articles-sidebar,
    .articles-toc {
        position: static;
        height: auto;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 解决移动端导航栏遮挡问题：取消固定定位，改为随页面滚动 */
    .header {
        position: static;
    }

    .main {
        margin-top: 0;
    }

    .header-content {
        flex-direction: column;
        gap: 15px;
        padding: 15px 0;
    }

    .nav-list {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }

    .nav-item {
        margin: 0 8px;
    }

    .nav-link {
        font-size: 14px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }

    .blog-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0;
    }

    .hero-title {
        font-size: 28px;
    }

    .blog-section,
    .about-section,
    .contact-section {
        padding: 50px 0;
    }

    .blog-card-content {
        padding: 20px;
    }
}