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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #292929;
    background-color: #fff;
}

.container {
    max-width: 728px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.site-header {
    padding: 48px 0 32px;
    border-bottom: 1px solid #e7e7e7;
    margin-bottom: 32px;
}

.site-title {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.site-subtitle {
    font-size: 16px;
    color: #757575;
}

/* Filters */
.filters {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 16px;
    border: 1px solid #e7e7e7;
    background: #fff;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    color: #757575;
    transition: all 0.2s;
}

.filter-btn:hover {
    border-color: #292929;
    color: #292929;
}

.filter-btn.active {
    background: #292929;
    color: #fff;
    border-color: #292929;
}

/* Articles List */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.article-card {
    padding-bottom: 32px;
    border-bottom: 1px solid #e7e7e7;
    cursor: pointer;
    transition: opacity 0.2s;
}

.article-card:hover {
    opacity: 0.8;
}

.article-card:last-child {
    border-bottom: none;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 14px;
    color: #757575;
}

.article-category {
    color: #292929;
    font-weight: 500;
}

.article-title {
    font-size: 24px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 12px;
    line-height: 1.3;
}

.article-summary {
    font-size: 16px;
    color: #757575;
    line-height: 1.5;
    margin-bottom: 12px;
}

.article-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 12px;
    background: #f5f5f5;
    border-radius: 12px;
    font-size: 12px;
    color: #757575;
}

/* Article Detail */
.article-detail {
    padding: 32px 0;
}

.article-header {
    margin-bottom: 32px;
}

.article-header .article-title {
    font-size: 36px;
    margin-bottom: 16px;
}

.article-header .article-meta {
    margin-bottom: 16px;
}

.article-content {
    font-size: 18px;
    line-height: 1.8;
    color: #292929;
}

.article-content p {
    margin-bottom: 24px;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 24px 0;
}

.article-content h2 {
    font-size: 24px;
    margin: 32px 0 16px;
}

.article-content h3 {
    font-size: 20px;
    margin: 24px 0 12px;
}

.back-to-home {
    margin: 48px 0;
    text-align: center;
}

.back-link {
    color: #292929;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
}

.back-link:hover {
    text-decoration: underline;
}

/* Footer */
.site-footer {
    padding: 32px 0;
    border-top: 1px solid #e7e7e7;
    margin-top: 64px;
    text-align: center;
    color: #757575;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .site-title {
        font-size: 24px;
    }

    .article-title {
        font-size: 20px;
    }

    .article-header .article-title {
        font-size: 28px;
    }

    .article-content {
        font-size: 16px;
    }
}