.page-hero {
    text-align: center;
    padding: 70px 20px 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #fff;
    margin-bottom: 40px;
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    animation: moveBg 20s linear infinite;
}

@keyframes moveBg {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 30px); }
}

.page-hero h1 {
    font-size: 38px;
    margin-bottom: 16px;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.page-hero p {
    font-size: 18px;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

.masonry-grid {
    margin: 0 auto;
    column-count: 3;
    column-gap: 24px;
}

.article-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    break-inside: avoid;
    margin-bottom: 24px;
    display: inline-block;
    width: 100%;
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.card-image {
    display: block;
    position: relative;
    overflow: hidden;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.card-image:hover img {
    transform: scale(1.08);
}

.no-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: rgba(255,255,255,0.4);
}

.card-image .lazy-load {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card-image .lazy-load.loaded {
    opacity: 1;
}

.ai-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: linear-gradient(135deg, var(--secondary-color), #2ecc71);
    color: #fff;
    padding: 5px 12px;
    border-radius: var(--radius-xl);
    font-size: 11px;
    font-weight: bold;
    z-index: 2;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.4);
    text-transform: uppercase;
}

.top-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: #fff;
    padding: 5px 12px;
    border-radius: var(--radius-xl);
    font-size: 11px;
    font-weight: bold;
    z-index: 2;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.4);
}

.recommend-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: linear-gradient(135deg, #f39c12, #e67e22);
    color: #fff;
    padding: 5px 12px;
    border-radius: var(--radius-xl);
    font-size: 11px;
    font-weight: bold;
    z-index: 2;
    box-shadow: 0 2px 8px rgba(243, 156, 18, 0.4);
}

.card-content {
    padding: 22px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.category-tag {
    display: inline-block;
    background: rgba(52, 152, 219, 0.1);
    color: var(--secondary-color);
    padding: 5px 14px;
    border-radius: var(--radius-xl);
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition-fast);
}

.category-tag:hover {
    background: rgba(52, 152, 219, 0.2);
}

.read-time {
    color: var(--text-light);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.read-time i {
    font-size: 12px;
}

.card-title {
    font-size: 18px;
    line-height: 1.45;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-weight: 600;
}

.card-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

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

.card-excerpt {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 18px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-light);
}

.card-footer span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.card-footer i {
    font-size: 13px;
    color: var(--secondary-color);
}

.load-more-wrapper {
    text-align: center;
    margin: 50px 0 30px;
}

.load-more-btn {
    background: linear-gradient(135deg, var(--secondary-color), #2980B9);
    color: #fff;
    border: none;
    padding: 14px 48px;
    border-radius: var(--radius-xl);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.load-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.load-more-btn.loading {
    opacity: 0.75;
    cursor: not-allowed;
    pointer-events: none;
}

.load-more-btn:disabled {
    background: var(--text-light);
    cursor: not-allowed;
    box-shadow: none;
}

.category-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    padding: 50px 30px;
    border-radius: var(--radius-lg);
    margin-bottom: 35px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.category-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
    background-size: 25px 25px;
}

.category-header h1 {
    font-size: 32px;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.category-header p {
    font-size: 16px;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

.sub-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 30px;
    justify-content: center;
}

.sub-category-item {
    background: var(--card-bg);
    padding: 10px 22px;
    border-radius: var(--radius-xl);
    font-size: 14px;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    font-weight: 500;
    border: 2px solid transparent;
}

.sub-category-item:hover,
.sub-category-item.active {
    color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tag-cloud-container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 40px;
}

.tag-cloud-title {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: center;
    align-items: center;
    line-height: 2;
}

.tag-cloud-item {
    display: inline-block;
    padding: 8px 20px;
    border-radius: var(--radius-xl);
    background: rgba(52, 152, 219, 0.08);
    color: var(--secondary-color);
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

.tag-cloud-item:hover {
    background: var(--secondary-color);
    color: #fff;
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.tag-cloud-item.size-xs { font-size: 12px; padding: 5px 12px; }
.tag-cloud-item.size-sm { font-size: 14px; padding: 7px 16px; }
.tag-cloud-item.size-md { font-size: 16px; padding: 9px 20px; }
.tag-cloud-item.size-lg { font-size: 19px; padding: 11px 24px; }
.tag-cloud-item.size-xl { font-size: 23px; padding: 13px 28px; font-weight: 700; }

@media (max-width: 992px) and (min-width: 601px) {
    .masonry-grid {
        column-count: 2;
        column-gap: 20px;
    }

    .page-hero h1 { font-size: 30px; }
    .page-hero { padding: 55px 18px 42px; }
    .category-header h1 { font-size: 28px; }
}

@media (max-width: 600px) {
    .masonry-grid {
        column-count: 1;
        column-gap: 0;
    }

    .page-hero {
        padding: 45px 15px 35px;
    }

    .page-hero h1 {
        font-size: 26px;
    }

    .page-hero p {
        font-size: 15px;
    }

    .card-image {
        height: 180px;
    }

    .card-content {
        padding: 16px;
    }

    .category-header {
        padding: 35px 20px;
    }

    .category-header h1 {
        font-size: 24px;
    }

    .tag-cloud-container {
        padding: 25px 18px;
    }

    .tag-cloud-item.size-xl {
        font-size: 19px;
        padding: 11px 22px;
    }
}