/* ==========================================================
   BioRevive Lab — Knowledge Hub (blog.css)
   Premium Dark Mode | Category Filter | Modal System
   ========================================================== */

/* ---- Hero ---- */
.blog-hero {
    position: relative;
    padding: 110px 0 70px;
    overflow: hidden;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}
.blog-hero-title {
    font-size: 46px;
    line-height: 1.25;
    margin-bottom: 18px;
    font-weight: 700;
}
.blog-hero-desc {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 760px;
    margin: 0 auto 0;
    line-height: 1.8;
}
.blog-stats-row {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 36px;
    flex-wrap: wrap;
}
.blog-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.blog-stat-num {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gold-primary), #a8f0c6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.blog-stat-label {
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-en);
    letter-spacing: 0.5px;
}

/* ---- Filter Bar ---- */
.filter-section {
    position: sticky;
    top: 68px;
    z-index: 80;
    background: rgba(250, 248, 245, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-color);
    padding: 14px 0;
}
.filter-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.filter-label {
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-en);
    font-weight: 600;
    letter-spacing: 0.5px;
    white-space: nowrap;
}
.filter-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: var(--font-th), var(--font-en), sans-serif;
    white-space: nowrap;
}
.filter-btn:hover {
    border-color: var(--gold-primary);
    color: var(--gold-primary);
}
.filter-btn.active {
    background: linear-gradient(135deg, var(--gold-primary), #b8882a);
    border-color: transparent;
    color: #0a0d18;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.25);
}
.filter-count {
    background: rgba(11, 25, 44, 0.12);
    padding: 1px 6px;
    border-radius: 999px;
    font-size: 10px;
    font-family: var(--font-en);
}

/* ---- Main Content ---- */
.blog-content-section {
    padding: 56px 0 80px;
}
.blog-content-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ---- Section Labels ---- */
.section-label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
}
.section-label-line {
    flex: 1;
    height: 1px;
    background: var(--border-color);
}
.section-label-text {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-en);
    font-weight: 700;
    letter-spacing: 1.5px;
    white-space: nowrap;
}

/* ---- Featured Article ---- */
.featured-card {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    background: var(--bg-card);
    margin-bottom: 56px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 400px;
}
.featured-card:hover {
    border-color: var(--border-glow-gold);
    box-shadow: 0 20px 60px rgba(212, 175, 55, 0.08);
    transform: translateY(-4px);
}
.featured-img-wrap {
    position: relative;
    overflow: hidden;
}
.featured-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
    display: block;
}
.featured-card:hover .featured-img-wrap img {
    transform: scale(1.04);
}
.featured-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    background: linear-gradient(135deg, var(--gold-primary), #b8882a);
    color: #0a0d18;
    font-size: 10px;
    font-weight: 800;
    font-family: var(--font-en);
    letter-spacing: 1.5px;
    padding: 5px 14px;
    border-radius: 999px;
    text-transform: uppercase;
}
.featured-cat-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 11px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 999px;
    backdrop-filter: blur(8px);
}
.featured-content {
    padding: 40px 44px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.featured-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.meta-tag {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-en);
}
.featured-title {
    font-size: 26px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: 18px;
    transition: color 0.25s;
}
.featured-card:hover .featured-title { color: var(--gold-primary); }
.featured-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 32px;
    flex-grow: 1;
}
.btn-read-article {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(212,175,55,0.12), rgba(212,175,55,0.05));
    border: 1px solid var(--border-glow-gold);
    color: var(--gold-primary);
    padding: 13px 28px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.25s;
    cursor: pointer;
    align-self: flex-start;
}
.btn-read-article:hover {
    background: var(--gold-primary);
    color: #0a0d18;
    box-shadow: 0 6px 20px rgba(212,175,55,0.3);
}
.btn-read-article i { font-size: 16px; }

/* ---- Article Row Cards ---- */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}
.article-card:hover {
    border-color: var(--border-glow-gold);
    box-shadow: 0 12px 40px rgba(212, 175, 55, 0.07);
    transform: translateY(-5px);
    background: var(--bg-card-hover);
}
.article-img-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: rgba(0,0,0,0.3);
    flex-shrink: 0;
}
.article-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.45s ease;
    display: block;
}
.article-card:hover .article-img-wrap img { transform: scale(1.06); }
.article-cat-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 10px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
    letter-spacing: 0.3px;
}
.cat-home {
    background: rgba(46,204,113,0.2);
    border: 1px solid rgba(46,204,113,0.4);
    color: #2ecc71;
}
.cat-business {
    background: rgba(212,175,55,0.18);
    border: 1px solid var(--border-glow-gold);
    color: var(--gold-primary);
}
.cat-science {
    background: rgba(139,92,246,0.18);
    border: 1px solid rgba(139,92,246,0.4);
    color: #a78bfa;
}
.article-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}
.article-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.article-date {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-en);
}
.article-readtime {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-en);
}
.article-title {
    font-size: 16px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: 12px;
    transition: color 0.25s;
}
.article-card:hover .article-title { color: var(--gold-primary); }
.article-excerpt {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-footer {
    border-top: 1px solid rgba(255,255,255,0.04);
    padding-top: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.btn-read-more {
    font-size: 13px;
    font-weight: 600;
    color: var(--gold-primary);
    display: flex;
    align-items: center;
    gap: 5px;
    transition: gap 0.2s;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-th), sans-serif;
    padding: 0;
}
.btn-read-more:hover { gap: 10px; }

/* ---- Empty State ---- */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
    display: none;
}
.empty-state i { font-size: 48px; margin-bottom: 16px; color: var(--border-color); display: block; }
.empty-state p { font-size: 15px; }

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(250, 248, 245, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
}
.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}
.modal-panel {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    width: 100%;
    max-width: 800px;
    margin: auto;
    overflow: hidden;
    transform: translateY(30px) scale(0.97);
    transition: transform 0.35s cubic-bezier(0.25,0.8,0.25,1);
    position: relative;
}
.modal-overlay.active .modal-panel {
    transform: translateY(0) scale(1);
}
.modal-hero-img {
    width: 100%;
    aspect-ratio: 16 / 7;
    object-fit: cover;
    object-position: center;
    display: block;
}
.modal-close-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    z-index: 10;
}
.modal-close-btn:hover {
    background: rgba(212,175,55,0.2);
    border-color: var(--gold-primary);
    color: var(--gold-primary);
}
.modal-body {
    padding: 40px 48px 48px;
}
.modal-cat-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.modal-title {
    font-size: 28px;
    font-weight: 800;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: 18px;
}
.modal-meta-row {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}
.modal-meta-item {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-en);
}
.modal-article-content {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.9;
}
.modal-article-content h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin: 28px 0 12px;
    font-weight: 700;
}
.modal-article-content p { margin-bottom: 18px; }
.modal-article-content ul {
    padding-left: 20px;
    margin-bottom: 18px;
}
.modal-article-content ul li {
    margin-bottom: 10px;
    line-height: 1.8;
}
.modal-article-content .highlight-box {
    background: rgba(212,175,55,0.07);
    border: 1px solid rgba(212,175,55,0.2);
    border-left: 4px solid var(--gold-primary);
    border-radius: 10px;
    padding: 18px 22px;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}
.modal-article-content .danger-box {
    background: rgba(239,68,68,0.07);
    border: 1px solid rgba(239,68,68,0.2);
    border-left: 4px solid #ef4444;
    border-radius: 10px;
    padding: 18px 22px;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}
.modal-article-content .science-box {
    background: rgba(139,92,246,0.07);
    border: 1px solid rgba(139,92,246,0.2);
    border-left: 4px solid #a78bfa;
    border-radius: 10px;
    padding: 18px 22px;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}
.modal-cta {
    margin-top: 40px;
    padding: 28px;
    background: linear-gradient(135deg, rgba(212,175,55,0.08), rgba(16,185,129,0.05));
    border: 1px solid rgba(212,175,55,0.2);
    border-radius: 16px;
    text-align: center;
}
.modal-cta p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px !important;
}
.btn-line-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #06C755;
    color: #fff;
    padding: 13px 28px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.25s;
}
.btn-line-cta:hover {
    background: #05b04a;
    box-shadow: 0 6px 20px rgba(6,199,85,0.3);
    transform: translateY(-2px);
}

/* ---- Env-Law Related Articles Strip ---- */
.related-articles-strip {
    padding: 64px 0;
    border-top: 1px solid var(--border-color);
}
.related-articles-strip .section-title { margin-bottom: 8px; font-size: 1.4rem; }
.related-strip-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 36px;
}
.related-strip-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    text-decoration: none;
    transition: all 0.3s;
    display: block;
}
.related-strip-card:hover {
    border-color: var(--border-glow-gold);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(212,175,55,0.08);
}
.related-strip-card img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    display: block;
}
.related-strip-body {
    padding: 18px 20px;
}
.related-strip-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 8px;
    transition: color 0.2s;
}
.related-strip-card:hover .related-strip-title { color: var(--gold-primary); }
.related-strip-meta {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}
.btn-view-all-blog {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 32px;
    background: transparent;
    border: 1px solid var(--border-glow-gold);
    color: var(--gold-primary);
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s;
}
.btn-view-all-blog:hover {
    background: var(--gold-primary);
    color: #0a0d18;
}

/* ---- Responsive ---- */
@media (max-width: 1100px) {
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .related-strip-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .blog-hero-title { font-size: 30px; }
    .filter-inner { padding: 0 20px; gap: 8px; }
    .blog-content-inner { padding: 0 20px; }
    .featured-card { grid-template-columns: 1fr; min-height: auto; }
    .featured-img-wrap { height: 220px; }
    .featured-content { padding: 28px 24px; }
    .featured-title { font-size: 20px; }
    .articles-grid { grid-template-columns: 1fr; }
    .related-strip-grid { grid-template-columns: 1fr; }
    .modal-body { padding: 28px 24px 36px; }
    .modal-title { font-size: 22px; }
    .blog-stats-row { gap: 24px; }
}
@media (max-width: 480px) {
    .featured-card { border-radius: 14px; }
    .filter-btn { font-size: 12px; padding: 7px 14px; }
}