/* === VARIABLES GLOBALES === */
:root {
    --primary-gradient: linear-gradient(135deg, #34c7ff 0%, #2b8af9 100%);
    --dark-bg: #0a0f1a;
    --card-bg: #1a1f2e;
    --text-primary: #ffffff;
    --text-secondary: #b0b8c8;
    --accent-cyan: #00E0FF;
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    --transition-fast: 0.3s ease;
    --transition-medium: 0.5s ease;
    --glow-shadow: 0 0 15px rgba(52, 199, 255, 0.5);
}

/* === STYLES GÉNÉRAUX === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Fond animé avec dégradé radial */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(0, 224, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(52, 199, 255, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 40% 80%, rgba(43, 138, 249, 0.06) 0%, transparent 50%);
    z-index: -1;
    animation: bg-shift 20s ease-in-out infinite alternate;
}

@keyframes bg-shift {
    0% { transform: translateX(-10px) translateY(-5px); }
    100% { transform: translateX(10px) translateY(5px); }
}

.knowledge-center-page {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === SECTION HEADER === */
.kc-header {
    padding: 120px 0 80px;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.kc-header.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.kc-header-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.kc-header-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 50px;
    line-height: 1.7;
}

/* === FILTRES === */
.kc-filters {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.filter-btn {
    padding: 12px 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(26, 31, 46, 0.6);
    color: var(--text-secondary);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.filter-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: translateY(-2px);
}

.filter-btn.is-active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
    box-shadow: var(--glow-shadow);
}

/* === GRILLE PRINCIPALE === */
.kc-main-grid {
    display: flex;
    gap: 30px;
    margin: 80px 0;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.kc-main-grid.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Article à la une (60%) */
.kc-article-card.featured {
    flex: 0 0 60%;
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-medium);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.kc-article-card.featured:hover {
    transform: translateY(-10px);
    border-color: var(--accent-cyan);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), var(--glow-shadow);
}

.kc-article-card.featured .card-image-wrapper {
    height: 300px;
    overflow: hidden;
    position: relative;
}

.kc-article-card.featured .card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.kc-article-card.featured:hover .card-image-wrapper img {
    transform: scale(1.05);
}

.kc-article-card.featured .card-content {
    padding: 30px;
}

.kc-article-card.featured .card-content h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 15px 0 20px;
    line-height: 1.4;
}

.kc-article-card.featured .card-content p {
    color: var(--text-secondary);
    margin-bottom: 25px;
    line-height: 1.6;
}

/* Colonne de droite (40%) */
.kc-right-column {
    flex: 0 0 40%;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.kc-right-column .kc-article-card {
    flex: 1;
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: all var(--transition-medium);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.kc-right-column .kc-article-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2), var(--glow-shadow);
}

.kc-right-column .card-image-wrapper {
    height: 150px;
    overflow: hidden;
}

.kc-right-column .card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.kc-right-column .kc-article-card:hover .card-image-wrapper img {
    transform: scale(1.05);
}

.kc-right-column .card-content {
    padding: 20px;
}

.kc-right-column .card-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 10px 0 15px;
    line-height: 1.4;
}

.kc-right-column .card-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

/* === TAGS === */
.card-tag {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag-une {
    background: var(--primary-gradient);
    color: white;
}

.tag-conseils {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

.tag-etude {
    background: rgba(40, 167, 69, 0.2);
    color: #28a745;
    border: 1px solid rgba(40, 167, 69, 0.3);
}

.tag-innovation {
    background: rgba(220, 53, 69, 0.2);
    color: #dc3545;
    border: 1px solid rgba(220, 53, 69, 0.3);
}

.tag-protocole {
    background: rgba(108, 117, 125, 0.2);
    color: #6c757d;
    border: 1px solid rgba(108, 117, 125, 0.3);
}

.tag-guide {
    background: rgba(23, 162, 184, 0.2);
    color: #17a2b8;
    border: 1px solid rgba(23, 162, 184, 0.3);
}

.tag-formation {
    background: rgba(102, 16, 242, 0.2);
    color: #6610f2;
    border: 1px solid rgba(102, 16, 242, 0.3);
}

/* === INFORMATIONS AUTEUR === */
.card-author-info {
    display: flex;
    align-items: center;
    gap: 15px;
    margin: 20px 0;
    padding: 15px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-details {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.publish-date {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.card-read-more {
    color: var(--accent-cyan);
    font-weight: 500;
    font-size: 0.9rem;
}

/* === MÉTADONNÉES === */
.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.read-time {
    background: rgba(0, 224, 255, 0.1);
    color: var(--accent-cyan);
    padding: 4px 8px;
    border-radius: 12px;
}

/* === GRILLE SECONDAIRE === */
.kc-secondary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin: 80px 0;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.kc-secondary-grid.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.kc-secondary-grid .kc-article-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: all var(--transition-medium);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.kc-secondary-grid .kc-article-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-cyan);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2), var(--glow-shadow);
}

.kc-secondary-grid .card-image-wrapper {
    height: 200px;
    overflow: hidden;
}

.kc-secondary-grid .card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.kc-secondary-grid .kc-article-card:hover .card-image-wrapper img {
    transform: scale(1.05);
}

.kc-secondary-grid .card-content {
    padding: 25px;
}

.kc-secondary-grid .card-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 10px 0 15px;
    line-height: 1.4;
}

.kc-secondary-grid .card-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* === BOUTON CHARGER PLUS === */
.kc-load-more-container {
    text-align: center;
    margin: 60px 0;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.kc-load-more-container.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.kc-cta-button {
    padding: 15px 30px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--glow-shadow);
}

.kc-cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2), var(--glow-shadow);
    filter: brightness(1.1);
}

/* === SECTION STATISTIQUES === */
.kc-stats-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin: 100px 0;
    padding: 0 20px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.kc-stats-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.kc-stat-card {
    background: rgba(26, 31, 46, 0.4);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: 40px 30px;
    text-align: center;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
    width: 100%;
    box-sizing: border-box;
}

.kc-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: transform 0.8s ease;
}

.kc-stat-card.is-visible::before {
    transform: scaleX(1);
}

.kc-stat-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-shadow);
}

.stat-icon {
    margin-bottom: 20px;
    opacity: 0.8;
}

.stat-wrapper {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-cyan);
    line-height: 1;
}

.stat-suffix {
    font-size: 2rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.kc-stat-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 10px;
    font-weight: 500;
}

/* === CTA FINAL === */
.kc-final-cta {
    text-align: center;
    padding: 80px 0 120px;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.kc-final-cta.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.button-primary {
    display: inline-block;
    padding: 18px 36px;
    background: var(--primary-gradient);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    box-shadow: var(--glow-shadow);
}

.button-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2), var(--glow-shadow);
    filter: brightness(1.1);
}

/* === ANIMATIONS DE FILTRAGE === */
.kc-article-card.is-hidden {
    opacity: 0;
    transform: scale(0.9);
    pointer-events: none;
    transition: all 0.5s ease;
}

.kc-article-card:not(.is-hidden) {
    opacity: 1;
    transform: scale(1);
    transition: all 0.5s ease;
}

/* === RESPONSIVE === */
@media (max-width: 1200px) {
    .knowledge-center-page {
        padding: 0 15px;
    }
    
    .kc-header-content h1 {
        font-size: 3rem;
    }
    
    .kc-main-grid {
        gap: 20px;
    }
    
    .kc-secondary-grid {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .kc-header-content h1 {
        font-size: 2.5rem;
    }
    
    .kc-header-content p {
        font-size: 1.1rem;
    }
    
    .kc-filters {
        gap: 10px;
    }
    
    .filter-btn {
        padding: 10px 18px;
        font-size: 0.8rem;
    }
    
    .kc-main-grid {
        flex-direction: column;
        gap: 20px;
    }
    
    .kc-article-card.featured,
    .kc-right-column {
        flex: none;
    }
    
    .kc-secondary-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .kc-stats-section {
        grid-template-columns: 1fr;
        gap: 30px;
        margin: 60px 0;
        padding: 0 10px;
    }
    
    .kc-stat-card {
        padding: 30px 20px;
        margin: 0;
        width: 100%;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .cta-content h2 {
        font-size: 2rem;
    }
    
    .cta-content p {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .kc-header {
        padding: 80px 0 60px;
    }
    
    .kc-header-content h1 {
        font-size: 2rem;
    }
    
    .kc-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .kc-article-card.featured .card-image-wrapper {
        height: 200px;
    }
    
    .kc-article-card.featured .card-content {
        padding: 20px;
    }
    
    .kc-article-card.featured .card-content h2 {
        font-size: 1.5rem;
    }
    
    .kc-right-column .card-image-wrapper {
        height: 120px;
    }
    
    .kc-secondary-grid .card-image-wrapper {
        height: 150px;
    }
    
    .kc-stat-card {
        padding: 30px 20px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .stat-suffix {
        font-size: 1.5rem;
    }
}