.expert__articles {
    --transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    width: 100%;
    margin: 0 auto;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    color: var(--dark);
    min-height: 100vh;
}
.expert-heading {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}
.expert-title {
    font-size: 3.2rem;
    margin-bottom: 1.2rem;
    background: linear-gradient(135deg, var(--primary), var(--dark));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
    letter-spacing: -1px;
    position: relative;
    display: inline-block;
    padding-bottom: 1rem;
}
.expert-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}
.expert-subtitle {
    font-size: 1.4rem;
    color: #64748b;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}
.category-selector {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.2rem;
    margin-bottom: 3.5rem;
}
.category-option {
    padding: 0.9rem 2rem;
    border-radius: 50px;
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.05rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
}
.category-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #3a7bd5);
    transition: var(--transition);
    z-index: -1;
}
.category-option:hover, .category-option.active {
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(44, 93, 155, 0.3);
}
.category-option.active::before, .category-option:hover::before {
    width: 100%;
}
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}
.knowledge-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    transform: translateY(20px);
    opacity: 0;
    animation: fadeUp 0.6s forwards;
}
@keyframes fadeUp {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
.knowledge-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.12);
}
.card-visual {
    position: relative;
    height: 240px;
    overflow: hidden;
}
.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}
.knowledge-card:hover .card-image {
    transform: scale(1.08);
}
.card-tag {
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
    background: var(--accent);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 700;
    z-index: 2;
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}
.card-details {
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}
.card-meta {
    display: flex;
    align-items: center;
    color: #64748b;
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
    gap: 1.5rem;
}
.card-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.card-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.author-icon {
    color: var(--primary);
    font-size: 1.1rem;
}
.card-title {
    font-size: 1.7rem;
    margin: 0 0 1.2rem;
    line-height: 1.4;
    color: var(--dark);
    font-weight: 800;
}
.card-description {
    color: #475569;
    line-height: 1.8;
    margin-bottom: 2rem;
    flex-grow: 1;
}
.card-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.1rem;
    width: fit-content;
    padding: 0.7rem 1.5rem;
    border-radius: 50px;
    background: rgba(44, 93, 155, 0.1);
}
.card-link:hover {
    color: white;
    background: var(--primary);
    transform: translateX(5px);
}
.card-link i {
    margin-left: 0.8rem;
    transition: var(--transition);
}
.card-link:hover i {
    transform: translateX(5px);
}
.knowledge-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    gap: 2rem;
    margin-bottom: 4vh;
}
.stat-item {
    text-align: center;
}
@media (max-width: 992px) {
    .knowledge-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: 2.5rem;
    }
    .expert-title {
        font-size: 2.8rem;
    }
}
@media (max-width: 768px) {
    .expert-title {
        font-size: 2.4rem;
    }
    .expert-subtitle {
        font-size: 1.2rem;
    }
    .category-selector {
        gap: 0.8rem;
    }
    .category-option {
        padding: 0.7rem 1.5rem;
        font-size: 0.95rem;
    }
    .knowledge-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    .stat-item {
        padding: 1rem 0;
    }
}
@media (max-width: 480px) {
    .expert-title {
        font-size: 2rem;
    }
    .expert-articles {
        padding: 0;
    }
    .expert-subtitle {
        font-size: 1.1rem;
    }
    .knowledge-grid {
        grid-template-columns: 1fr;
        padding: 2vh;
    }
}