/* Certificates Section */
#certificates {
    padding: 60px 0;
    background: var(--bg-card);
}

#certificates .section-title {
    text-align: center;
    margin-bottom: 10px;
}

#certificates .section-subtitle {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 40px;
    color: var(--text-muted);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.certificate-card {
    background: var(--bg-light);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid var(--border-soft);
}

.certificate-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.certificate-card img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
}

.certificate-card-caption {
    padding: 16px;
    text-align: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
}

/* Certificate Modal */
.certificate-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.certificate-modal.is-open {
    display: flex;
}

.certificate-modal-content {
    background: #fff;
    border-radius: 12px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
}

.certificate-modal-img {
    width: 100%;
    height: auto;
    max-height: 80vh;
    object-fit: contain;
    display: block;
}

.certificate-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
    z-index: 10;
}

.certificate-modal-close:hover {
    background: rgba(0, 0, 0, 0.8);
}

.certificate-modal-close svg {
    width: 20px;
    height: 20px;
    fill: #fff;
}

/* Responsive: Tablet */
@media (max-width: 900px) {
    .certificates-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Responsive: Mobile */
@media (max-width: 520px) {
    #certificates {
        padding: 40px 0;
    }

    .certificates-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .certificate-card img {
        height: 220px;
    }

    .certificate-modal-content {
        max-width: 100%;
    }

    .certificate-modal-close {
        top: 12px;
        right: 12px;
        width: 36px;
        height: 36px;
    }
}