/* ===================================================
   CATEGORY.CSS — Category listing page styles
   =================================================== */

/* ── Category Hero ── */
.cat-hero {
    position: relative;
    z-index: 10;
    padding: calc(var(--nav-height) + 60px) 24px 60px;
    text-align: center;
}

.cat-hero-inner {
    max-width: 680px;
    margin: 0 auto;
}

.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
    transition: color var(--trans-fast);
}

.breadcrumb:hover {
    color: var(--accent-primary);
}

.cat-hero-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    line-height: 1;
}

.cat-badge {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.cat-hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3.2rem);
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 14px;
}

.cat-hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.cat-count-wrap {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 999px;
}

.cat-count {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.cat-count-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ── Filter Bar ── */
.filter-bar {
    position: sticky;
    top: var(--nav-height);
    z-index: 100;
    background: rgba(10, 12, 20, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-card);
    border-top: 1px solid var(--border-card);
}

.filter-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.filter-btn {
    padding: 6px 16px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: all var(--trans-fast);
}

.filter-btn.active,
.filter-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(124, 106, 247, 0.08);
}

.search-wrap {
    position: relative;
    flex: 0 1 280px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 8px 14px 8px 36px;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color var(--trans-fast);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-input:focus {
    border-color: var(--accent-primary);
}

/* ── Blog List ── */
.blog-list-section {
    position: relative;
    z-index: 10;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.blog-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

/* Blog List Item */
.blog-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px;
    background: transparent;
    border-radius: var(--radius-md);
    transition: all var(--trans-base);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    position: relative;
}

.blog-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    border-radius: 2px;
    background: var(--accent-primary);
    opacity: 0;
    transform: scaleY(0);
    transition: all var(--trans-base);
}

.blog-item:hover {
    background: var(--bg-card);
}

.blog-item:hover::before {
    opacity: 1;
    transform: scaleY(1);
}

.blog-item-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 28px;
    padding-top: 4px;
    flex-shrink: 0;
}

.blog-item-body {
    flex: 1;
    min-width: 0;
}

.blog-item-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.blog-item-date {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.blog-item-tag {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 2px 8px;
    border-radius: 4px;
}

.blog-item-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 8px;
    transition: color var(--trans-fast);
}

.blog-item:hover .blog-item-title {
    color: var(--accent-primary);
}

.blog-item-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-item-footer {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 10px;
}

.read-time {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.blog-item-arrow {
    margin-left: auto;
    color: var(--text-muted);
    font-size: 1.2rem;
    flex-shrink: 0;
    transition: transform var(--trans-fast), color var(--trans-fast);
    padding-top: 4px;
}

.blog-item:hover .blog-item-arrow {
    transform: translateX(4px);
    color: var(--accent-primary);
}

/* ── Empty State ── */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.9rem;
}

/* ── Category Color Themes ── */
.theme-ml .cat-badge {
    background: rgba(124, 106, 247, 0.15);
    color: var(--cat-ml);
}

.theme-dl .cat-badge {
    background: rgba(79, 200, 184, 0.15);
    color: var(--cat-dl);
}

.theme-nlp .cat-badge {
    background: rgba(247, 185, 106, 0.15);
    color: var(--cat-nlp);
}

.theme-cv .cat-badge {
    background: rgba(247, 106, 106, 0.15);
    color: var(--cat-cv);
}

.theme-genai .cat-badge {
    background: rgba(208, 106, 247, 0.15);
    color: var(--cat-genai);
}

.theme-ainews .cat-badge {
    background: rgba(106, 180, 247, 0.15);
    color: var(--cat-ainews);
}

.theme-ml .blog-item::before {
    background: var(--cat-ml);
}

.theme-dl .blog-item::before {
    background: var(--cat-dl);
}

.theme-nlp .blog-item::before {
    background: var(--cat-nlp);
}

.theme-cv .blog-item::before {
    background: var(--cat-cv);
}

.theme-genai .blog-item::before {
    background: var(--cat-genai);
}

.theme-ainews .blog-item::before {
    background: var(--cat-ainews);
}

.theme-statistics .cat-badge {
    background: rgba(251, 146, 60, 0.15);
    color: #fb923c;
}

.theme-statistics .blog-item::before {
    background: #fb923c;
}

/* ── Category Schedule Badge ── */
.cat-schedule-badge {
    display: none;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 10px 20px;
    background: rgba(124, 106, 247, 0.06);
    border: 1px solid rgba(124, 106, 247, 0.15);
    border-radius: 999px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    justify-content: center;
    animation: fadeIn 0.4s ease;
}

.cat-schedule-badge strong {
    color: var(--text-primary);
    font-weight: 600;
}

.sched-icon {
    font-size: 1rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .filter-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .search-wrap {
        flex: 1 1 100%;
    }

    .blog-item-num {
        display: none;
    }
}