/* ========================================
   CATEGORY PAGE SHARED STYLES
   ======================================== */

/* Category Hero Section */
.category-hero {
    position: relative;
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.category-hero > img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
}

.category-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.category-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 var(--spacing-md);
    margin-top: -20px; /* 整体上移20px */
}

.category-hero h1 {
    font-family: var(--font-heading);
    font-size: 54px; /* 从48px增大到54px */
    font-weight: 700;
    margin-bottom: 12px;
    color: #fff; /* 纯白色 */
    text-shadow: 0 2px 10px rgba(0,0,0,0.35); /* 轻微阴影 */
}

.category-hero p {
    font-size: 18px;
    color: rgba(255,255,255,0.92); /* 接近纯白，92%不透明度 */
    text-shadow: 0 2px 8px rgba(0,0,0,0.25); /* 轻微阴影 */
}

/* Filter Bar */
.filter-bar {
    background: white;
    border-bottom: 1px solid #E9ECEF;
    position: sticky;
    top: 100px;
    z-index: 999;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.filter-container,
.sort-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px var(--spacing-lg);
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.sort-container {
    padding-top: 0;
    padding-bottom: 16px;
    border-top: 1px solid #F1F3F5;
}

.filter-label {
    font-weight: 600;
    color: var(--color-contrast-light);
    font-size: 14px;
    white-space: nowrap;
    margin-right: 8px;
    width: 100%;
    flex-basis: 100%;
    margin-bottom: -4px;
}

.filter-btn,
.sort-btn {
    padding: 9px 22px;
    border: 2px solid #E9ECEF;
    background: white;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-contrast-light);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
    white-space: nowrap;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    line-height: 1;
}

.filter-btn:hover,
.sort-btn:hover {
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
    background: rgba(0, 119, 182, 0.05);
}

.filter-btn.active {
    background: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
    color: white;
}

.sort-btn.active {
    background: var(--color-accent-orange);
    border-color: var(--color-accent-orange);
    color: white;
}

/* Articles Grid */
.articles-container {
    background: var(--color-base-light);
    min-height: 60vh;
    padding: var(--spacing-xl) 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* Article Card Styles (分类页面卡片) */
.article-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid rgba(233, 236, 239, 0.8);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.1);
    border-color: transparent;
}

.article-card > a {
    display: block;
    text-decoration: none;
}

.article-image,
img.article-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    object-position: center;
    display: block;
    border-radius: 12px 12px 0 0;
    margin: 0;
}

.article-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.article-meta {
    display: flex;
    gap: 8px;
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.article-category {
    display: inline-block;
    padding: 5px 12px;
    background: var(--color-accent-blue);
    color: white;
    font-size: 13px;
    font-weight: 600;
    border-radius: 4px;
    font-family: var(--font-heading);
}

.article-label {
    display: inline-block;
    padding: 5px 12px;
    background: var(--color-accent-orange);
    color: white;
    font-size: 13px;
    font-weight: 600;
    border-radius: 4px;
    font-family: var(--font-heading);
}

.article-title {
    font-size: 20px;
    margin-bottom: var(--spacing-xs);
    color: var(--color-contrast);
    line-height: 1.3;
    font-family: var(--font-heading);
}

.article-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.article-title a:hover {
    color: var(--color-accent-blue);
}

.article-excerpt {
    font-size: 15px;
    color: var(--color-contrast-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
    flex: 1;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xs);
    border-top: 1px solid #E9ECEF;
    font-size: 13px;
    color: var(--color-contrast-lighter);
    margin-top: auto;
}

/* Loading State */
.loading-message {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-contrast-lighter);
    font-size: 18px;
}

/* Responsive */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-hero h1 {
        font-size: 38px;
    }
}

@media (max-width: 768px) {
    .category-hero {
        height: 200px;
    }
    
    .category-hero h1 {
        font-size: 32px;
    }
    
    .category-hero p {
        font-size: 16px;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-bar {
        top: 80px;
    }
    
    .article-image,
    img.article-image {
        height: auto;
        aspect-ratio: 16 / 9;
        object-fit: cover;
        object-position: center;
    }
}