.certificates-page-header {
    padding-top: 140px;
    text-align: center;
    padding-bottom: 40px;
}

.subtitle {
    color: var(--text-muted);
    margin-top: -40px;
    margin-bottom: 40px;
}

.filter-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.filter-btn {
    padding: 10px 25px;
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    border-radius: 30px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    transition: 0.3s;
    white-space: nowrap;
}

.filter-btn:hover, .filter-btn.active {
    background: var(--primary-color);
    color: var(--bg-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}


.certificates-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    padding-bottom: 50px;
}

.certificate-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.certificate-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 25px -5px rgba(56, 189, 248, 0.3);
}

.cert-img-box {
    width: 100%;
    aspect-ratio: 16/9;
    position: relative;
    overflow: hidden;
    background: #0f172a;
}

.cert-img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.certificate-card:hover .cert-img-box img {
    transform: scale(1.05);
    filter: blur(2px) brightness(0.7);
}

.cert-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(2px);
}

.certificate-card:hover .cert-overlay {
    opacity: 1;
}

.cert-btn {
    padding: 12px 24px;
    background: var(--primary-color);
    color: var(--bg-color);
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateY(20px);
    transition: transform 0.3s ease;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
}

.certificate-card:hover .cert-btn {
    transform: translateY(0);
}

.cert-btn:hover {
    background: #fff;
    color: var(--primary-color);
}

.cert-content {
    padding: 25px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.cert-issuer {
    font-size: 0.8rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.cert-content h3 {
    font-size: 1.25rem;
    color: var(--text-color);
    line-height: 1.4;
    margin-bottom: 15px;
    font-weight: 600;
}

.cert-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.cert-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

@media (max-width: 768px) {
    .certificates-container {
        grid-template-columns: 1fr;
        padding: 0 20px;
    }
}