/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #ffffff;
    padding-top: 76px; /* 为固定导航栏留出空间 */
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%) !important;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff !important;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9) !important;
    transition: all 0.3s ease;
    border-radius: 6px;
    margin: 0 2px;
    padding: 8px 12px !important;
}

.navbar-nav .nav-link:hover {
    color: #ffffff !important;
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: 12px;
    padding: 8px;
}

.dropdown-item {
    border-radius: 8px;
    padding: 8px 12px;
    transition: all 0.2s ease;
}

.dropdown-item:hover {
    background-color: var(--bg-light);
    transform: translateX(4px);
}

/* 主要内容区域 */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* 卡片样式 */
.card {
    border: none;
    box-shadow: var(--shadow);
    border-radius: 16px;
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-img-top {
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-img-top {
    transform: scale(1.05);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.card-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.card-text {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* 文章元信息 */
.post-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.post-meta a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.post-meta a:hover {
    text-decoration: underline;
}

.post-meta .separator {
    margin: 0 8px;
    color: var(--border-color);
}

/* 标签样式 */
.tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    text-decoration: none;
    margin: 2px;
    transition: all 0.3s ease;
}

.tag:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* 分类标签 */
.category-badge {
    background: linear-gradient(135deg, var(--accent-color), #f59e0b);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}

.category-badge:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

/* 按钮样式 */
.btn {
    border-radius: 10px;
    font-weight: 500;
    padding: 10px 20px;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

/* 分页样式 */
.pagination {
    justify-content: center;
    margin-top: 3rem;
}

.page-link {
    border: none;
    color: var(--text-muted);
    font-weight: 500;
    padding: 12px 16px;
    margin: 0 4px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.page-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-light);
    transform: translateY(-2px);
}

.page-item.active .page-link {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border: none;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* 侧边栏样式 */
.sidebar {
    background: var(--bg-light);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.sidebar h5 {
    color: var(--text-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.sidebar .list-unstyled li {
    margin-bottom: 0.75rem;
}

.sidebar .list-unstyled a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
}

.sidebar .list-unstyled a:hover {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
    transform: translateX(4px);
}

/* 文章内容样式 */
.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.post-content h2 {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content blockquote {
    border-left: 4px solid var(--primary-color);
    background: var(--bg-light);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

.post-content code {
    background: var(--bg-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary-color);
}

.post-content pre {
    background: #1e293b;
    border-radius: 12px;
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.post-content pre code {
    background: none;
    padding: 0;
    color: #e2e8f0;
}

/* 评论样式 */
.comment {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
}

.comment-author {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.comment-date {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

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

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

/* 表单样式 */
.form-control {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-label {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

/* 页脚样式 */
footer {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%) !important;
}

footer h5,
footer h6 {
    color: #ffffff;
}

footer .text-muted {
    color: rgba(255, 255, 255, 0.7) !important;
}

footer a.text-muted:hover {
    color: #ffffff !important;
}

.social-links a {
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--primary-color) !important;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding-top: 60px;
    }
    
    .main-content {
        padding: 1rem 0;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .sidebar {
        padding: 1.5rem;
    }
    
    .comment-reply {
        margin-left: 1rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(37, 99, 235, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 搜索结果高亮 */
.search-highlight {
    background-color: #fef3c7;
    padding: 2px 4px;
    border-radius: 4px;
    font-weight: 500;
}

/* 特色文章样式 */
.featured-post {
    position: relative;
    overflow: hidden;
}

.featured-post::before {
    content: '推荐';
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(135deg, var(--accent-color), #f59e0b);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    z-index: 10;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* 夜间模式样式 */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #94a3b8;
    --accent-color: #f59e0b;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --bg-light: #1e293b;
    --border-color: #334155;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] body {
    background-color: #0f172a;
    color: var(--text-color);
}

[data-theme="dark"] .card {
    background-color: #1e293b;
    border-color: var(--border-color);
}

[data-theme="dark"] .card-title {
    color: var(--text-color);
}

[data-theme="dark"] .card-text {
    color: var(--text-muted);
}

[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .form-control {
    background-color: #1e293b;
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .form-control:focus {
    background-color: #1e293b;
    border-color: var(--primary-color);
    color: var(--text-color);
}

[data-theme="dark"] .dropdown-menu {
    background-color: #1e293b;
    border-color: var(--border-color);
}

[data-theme="dark"] .dropdown-item {
    color: var(--text-color);
}

[data-theme="dark"] .dropdown-item:hover {
    background-color: #334155;
    color: var(--text-color);
}

[data-theme="dark"] .list-group-item {
    background-color: #1e293b;
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .sidebar {
    background-color: #1e293b;
    border-color: var(--border-color);
}

[data-theme="dark"] .pagination .page-link {
    background-color: #1e293b;
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .pagination .page-link:hover {
    background-color: #334155;
    color: var(--text-color);
}

[data-theme="dark"] .pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: white;
}

[data-theme="dark"] .btn-outline-secondary {
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

[data-theme="dark"] .btn-outline-secondary:hover {
    background-color: var(--secondary-color);
    color: white;
}

[data-theme="dark"] .navbar {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%) !important;
}

[data-theme="dark"] footer {
    background-color: #0f172a !important;
}

[data-theme="dark"] .comment {
    background-color: #1e293b;
    border-color: var(--border-color);
}

[data-theme="dark"] .comment-author {
    color: var(--text-color);
}

[data-theme="dark"] .comment-content {
    color: var(--text-muted);
}

[data-theme="dark"] .post-content {
    color: var(--text-color);
}

[data-theme="dark"] .post-content h1,
[data-theme="dark"] .post-content h2,
[data-theme="dark"] .post-content h3,
[data-theme="dark"] .post-content h4,
[data-theme="dark"] .post-content h5,
[data-theme="dark"] .post-content h6 {
    color: var(--text-color);
}

[data-theme="dark"] .post-content blockquote {
    border-left-color: var(--primary-color);
    background-color: #1e293b;
}

[data-theme="dark"] .post-content code {
    background-color: #334155;
    color: #fbbf24;
}

[data-theme="dark"] .post-content pre {
    background-color: #1e293b;
    border-color: var(--border-color);
}

[data-theme="dark"] .tag {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
}

[data-theme="dark"] .category-badge {
    background: linear-gradient(135deg, var(--accent-color), #f59e0b);
}

/* 主题切换按钮样式 */
#theme-toggle {
    transition: all 0.3s ease;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    transform: scale(1.1);
}

#theme-icon {
    transition: transform 0.3s ease;
}

[data-theme="dark"] #theme-icon {
    transform: rotate(180deg);
}