.articles-filter {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(to bottom, var(--background-color), white);
}

.filter-btn {
    background: white;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.8rem 1.5rem;
    margin: 0.5rem;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn.active, .filter-btn:hover {
    background: var(--primary-color);
    color: white;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.article-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 2rem;
}

.article-icon {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

.article-icon i {
    position: relative;
    z-index: 2;
    font-size: 2.5rem;
    color: var(--primary-color);
    background: white;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
}

.icon-background {
    position: absolute;
    top: -10%;
    left: -10%;
    right: -10%;
    bottom: -10%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    opacity: 0.1;
    transition: all 0.3s;
}

.article-card:hover {
    transform: translateY(-10px);
}

.article-card:hover .article-icon i {
    color: white;
    background: var(--primary-color);
}

.article-card:hover .icon-background {
    transform: scale(1.2);
    opacity: 0.2;
}

.article-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.category-tag {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

.article-content {
    padding: 1.5rem;
}

.article-content h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.article-content p {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    color: #888;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

.read-more:hover {
    color: var(--primary-color);
}

.page-header {
    text-align: center;
    padding: 3rem 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.article-logo {
    position: absolute;
    top: -25px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    z-index: 1;
}

.article-logo i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    background: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.back-to-top:hover {
    transform: translateY(-5px);
    background: var(--secondary-color);
}

.site-title {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.english-title {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 0.2rem;
}

.footer-title {
    text-align: center;
    margin-bottom: 1rem;
}

.footer-title h3 {
    margin-bottom: 0.2rem;
}

.footer-title .english-title {
    font-size: 0.8rem;
    opacity: 0.8;
}