/* Certificate Vault */
.vault-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.cert-card {
    position: relative;
    height: 200px;
    perspective: 1000px;
    cursor: none;
}

.cert-front, .cert-back {
    position: absolute;
    width: 100%; height: 100%;
    backface-visibility: hidden;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center; flex-direction: column;
}

.cert-front {
    background: linear-gradient(135deg, rgba(20,25,40,1) 0%, rgba(10,15,25,1) 100%);
    border: 1px solid rgba(255,255,255,0.05);
    box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}

.lock-icon {
    font-size: 3rem;
    margin-bottom: 10px;
    filter: drop-shadow(0 0 10px rgba(255,255,255,0.2));
}

.cert-front p {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.cert-back {
    background: rgba(0, 217, 255, 0.05);
    border: 1px solid var(--primary);
    transform: rotateY(180deg);
    box-shadow: 0 0 30px rgba(0, 217, 255, 0.1);
}

.cert-inner {
    padding: 20px;
    text-align: center;
}

.cert-badge {
    display: inline-block;
    padding: 5px 10px;
    background: var(--primary);
    color: #000;
    font-weight: bold;
    font-size: 0.7rem;
    border-radius: 4px;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.cert-inner h4 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.cert-inner p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.cert-card:hover .cert-front {
    transform: rotateY(-180deg);
}

.cert-card:hover .cert-back {
    transform: rotateY(0deg);
}