/* References Section */
#references {
    background: #f8f9fa;
    padding: 60px 20px;
    border-top: 1px solid #e2e8f0;
}

.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
    align-items: center;
    justify-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.ref-logo {
    width: 100%;
    height: 100px;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: all 0.3s ease;
    filter: grayscale(100%);
    opacity: 0.7;
    cursor: pointer;
}

.ref-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    border-color: var(--primary-color);
}

.ref-logo svg {
    max-width: 100%;
    max-height: 100%;
    fill: #4a5568;
    transition: fill 0.3s ease;
}

.ref-logo:hover svg {
    fill: var(--secondary-color);
}

/* Placeholder Style */
.ref-placeholder {
    font-weight: 700;
    color: #cbd5e0;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

.ref-logo:hover .ref-placeholder {
    color: var(--primary-color);
}