:root {
    /* 主色调 */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;

    /* 文字颜色 */
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #484f58;

    /* 强调色 */
    --accent-primary: #58a6ff;
    --accent-green: #3fb950;
    --accent-purple: #bc8cff;
    --accent-orange: #d29922;
    --accent-pink: #f778ba;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #58a6ff 0%, #bc8cff 100%);

    /* 阴影 */
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 12px 40px rgba(88, 166, 255, 0.15);

    /* 边框 */
    --border-color: #30363d;
    --border-hover: #58a6ff;
}

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

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

/* 导航栏 */
.navbar {
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 0;
    transition: all 0.3s ease;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary) !important;
    text-decoration: none;
}

.brand-icon {
    font-size: 1.8rem;
}

.brand-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.nav-link:hover {
    color: var(--accent-primary) !important;
}

.search-input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    min-width: 200px;
}

.search-input:focus {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(88, 166, 255, 0.25);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* 主内容区 */
.main-content {
    min-height: calc(100vh - 200px);
    padding-top: 80px;
}

/* Hero区域 */
.hero-section {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(88, 166, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(188, 140, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* 文章卡片 */
.article-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--border-hover);
}

.article-card:hover::before {
    transform: scaleX(1);
}

.card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-category {
    margin-bottom: 0.75rem;
}

.card-category .badge {
    font-size: 0.75rem;
    padding: 0.35em 0.65em;
    background: var(--accent-purple);
    color: #fff;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.card-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.card-title a:hover {
    color: var(--accent-primary);
}

.card-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    font-size: 0.75rem;
    padding: 0.2em 0.6em;
    background: var(--bg-tertiary);
    color: var(--accent-green);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.tag:hover {
    border-color: var(--accent-green);
    background: rgba(63, 185, 80, 0.1);
}

.btn-read-more {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: gap 0.3s ease;
}

.btn-read-more:hover {
    gap: 0.6rem;
    color: var(--accent-primary);
}

/* 侧边栏 */
.sidebar {
    position: sticky;
    top: 100px;
}

.sidebar-widget {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.sidebar-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-title i {
    color: var(--accent-primary);
}

/* 分类列表 */
.category-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-list li {
    margin-bottom: 0.5rem;
}

.category-list a {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.category-list a:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
}

.category-count {
    background: var(--bg-tertiary);
    padding: 0.15em 0.5em;
    border-radius: 10px;
    font-size: 0.8rem;
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-cloud a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.3em 0.6em;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.tag-cloud a:hover {
    background: var(--accent-primary);
    color: #fff;
}

/* 最近文章 */
.recent-posts {
    list-style: none;
    padding: 0;
    margin: 0;
}

.recent-posts li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.recent-posts li:last-child {
    border-bottom: none;
}

.recent-posts a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.recent-posts a:hover {
    color: var(--accent-primary);
}

.recent-posts .post-date {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* 分页 */
.pagination {
    justify-content: center;
    margin-top: 2rem;
}

.page-link {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    margin: 0 0.25rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.page-link:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.page-item.active .page-link {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* 文章详情 */
.article-detail {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.article-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.article-body {
    line-height: 1.8;
}

.article-body h2,
.article-body h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 1rem;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.article-body a {
    color: var(--accent-primary);
    text-decoration: none;
}

.article-body a:hover {
    text-decoration: underline;
}

/* 代码块 */
.article-body pre {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    overflow-x: auto;
    position: relative;
}

.article-body code {
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9rem;
}

.article-body p code {
    background: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.85em;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    border-radius: 8px 8px 0 0;
    margin: -1rem -1rem 1rem -1rem;
}

.code-lang {
    font-size: 0.8rem;
    color: var(--accent-primary);
}

.btn-copy {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.btn-copy:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* 目录 */
.toc {
    position: sticky;
    top: 100px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.toc-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-primary);
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin-bottom: 0.5rem;
}

.toc-list a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    display: block;
    padding: 0.3rem 0.5rem;
    border-left: 2px solid transparent;
    transition: all 0.3s ease;
}

.toc-list a:hover,
.toc-list a.active {
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    background: rgba(88, 166, 255, 0.05);
}

.toc-list .toc-h3 {
    padding-left: 1.5rem;
}

/* 评论区 */
.comments-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.comments-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.comment-form {
    margin-bottom: 2rem;
}

.comment-form .form-control {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.comment-form .form-control:focus {
    background: var(--bg-primary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(88, 166, 255, 0.25);
}

.comment-item {
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    background: var(--bg-tertiary);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.comment-author {
    font-weight: 600;
    color: var(--accent-primary);
}

.comment-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.comment-content {
    color: var(--text-secondary);
    line-height: 1.6;
}

.comment-reply {
    margin-left: 2rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border-color);
}

/* 页脚 */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-primary);
}

/* 返回顶部按钮 */
.btn-back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 45px;
    height: 45px;
    background: var(--accent-primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
    transition: all 0.3s ease;
    z-index: 1000;
}

.btn-back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
}

.btn-back-to-top.show {
    display: flex;
}

/* 响应式 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .article-title {
        font-size: 1.5rem;
    }

    .sidebar {
        margin-top: 2rem;
    }

    .toc {
        position: static;
        margin-bottom: 1.5rem;
    }
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.5s ease forwards;
}

/* 归档页面 */
.archive-list {
    list-style: none;
    padding: 0;
}

.archive-item {
    display: flex;
    align-items: flex-start;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.archive-date {
    min-width: 120px;
    color: var(--accent-orange);
    font-weight: 500;
}

.archive-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.archive-title a:hover {
    color: var(--accent-primary);
}

/* 统计卡片 */
.stats-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stats-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.stats-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.stats-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0.25rem;
}

.stats-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}