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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* Header */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #333;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo span {
    font-size: 24px;
    font-weight: bold;
}

.nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav ul li {
    position: relative;
}

.nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 5px 10px;
    transition: color 0.3s;
}

.nav ul li a:hover {
    color: #21a6f5;
}

.nav ul li .submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    list-style: none;
    padding: 10px 0;
    min-width: 150px;
}

.nav ul li:hover .submenu {
    display: block;
}

.nav ul li .submenu li a {
    padding: 8px 15px;
    display: block;
}

.lang-switch select {
    padding: 5px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
    cursor: pointer;
}

/* Banner */
.banner {
    background: linear-gradient(135deg, #21a6f5 0%, #1e88e5 100%);
    color: #fff;
    padding: 60px 0;
    text-align: center;
}

.banner-content h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

.banner-content p {
    font-size: 18px;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    padding: 40px 0;
}

.content-section {
    margin-top: 40px;
}

.row {
    display: flex;
    gap: 30px;
}

.col-md-8 {
    flex: 2;
}

.col-md-4 {
    flex: 1;
}

h2, h3 {
    margin-bottom: 20px;
    color: #333;
}

/* Article List */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.article-item {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.article-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.article-item h3 {
    margin-bottom: 10px;
}

.article-item h3 a {
    color: #333;
    text-decoration: none;
    font-size: 20px;
}

.article-item h3 a:hover {
    color: #21a6f5;
}

.summary {
    color: #666;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.meta {
    display: flex;
    gap: 20px;
    color: #999;
    font-size: 14px;
}

/* Sidebar */
.sidebar {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.category-list {
    list-style: none;
}

.category-list li {
    margin-bottom: 10px;
}

.category-list li a {
    text-decoration: none;
    color: #333;
    padding: 8px 10px;
    display: block;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.category-list li a:hover,
.category-list li a.active {
    background-color: #e3f2fd;
    color: #21a6f5;
}

/* Footer */
.footer {
    background-color: #333;
    color: #fff;
    padding: 40px 0;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    gap: 60px;
    margin-bottom: 20px;
}

.footer-section h4 {
    margin-bottom: 15px;
}

.footer-section p {
    color: #999;
    margin-bottom: 5px;
}

.copyright {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
    color: #999;
}

/* Breadcrumb */
.breadcrumb {
    margin-bottom: 20px;
    font-size: 14px;
    color: #666;
}

.breadcrumb a {
    color: #21a6f5;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Page Title */
.page-title {
    font-size: 28px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #21a6f5;
}

/* Pagination */
.pagination {
    margin-top: 30px;
    text-align: center;
}

.pagination a {
    display: inline-block;
    padding: 8px 16px;
    margin: 0 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
}

.pagination a:hover,
.pagination a.active {
    background-color: #21a6f5;
    color: #fff;
    border-color: #21a6f5;
}

/* Article Detail */
.article-detail {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.article-title {
    font-size: 32px;
    margin-bottom: 20px;
    text-align: center;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
    color: #999;
    font-size: 14px;
}

.article-content {
    line-height: 1.8;
    font-size: 16px;
    color: #333;
}

.article-content img {
    max-width: 100%;
    height: auto;
    margin: 15px 0;
}

.article-content h2,
.article-content h3,
.article-content h4 {
    margin: 20px 0 10px;
}

.article-content p {
    margin-bottom: 15px;
}

.article-tags {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.article-tags .tag {
    display: inline-block;
    padding: 5px 12px;
    background-color: #e3f2fd;
    color: #21a6f5;
    border-radius: 20px;
    text-decoration: none;
    margin-right: 10px;
    margin-bottom: 10px;
    font-size: 14px;
}

.article-tags .tag:hover {
    background-color: #21a6f5;
    color: #fff;
}

/* Related Articles */
.related-articles {
    margin-top: 30px;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
}

.related-articles ul {
    list-style: none;
}

.related-articles ul li {
    margin-bottom: 10px;
}

.related-articles ul li a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.related-articles ul li a:hover {
    color: #21a6f5;
}

/* Single Page */
.single-page {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.page-content {
    line-height: 1.8;
    font-size: 16px;
    color: #333;
}

.page-content img {
    max-width: 100%;
    height: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .row {
        flex-direction: column;
    }
    
    .header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 30px;
    }
}