/* ========== PRODUCT CARDS (Molecular Formula Layout) ========== */
.product-card {
    background: var(--navy-card);
    border: 1px solid var(--navy-border);
    transition: var(--trans);
    display: flex;
    flex-direction: column;
    height: 100%;
}
.product-card:hover {
    border-color: var(--teal);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 212, 180, 0.1);
}
.product-visual {
    height: 140px;
    background: #0a1f3d;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--navy-border);
}
.visual-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, transparent 0%, rgba(5,20,40,0.8) 100%);
    opacity: 0.6;
}
.product-formula {
    font-size: 2.75rem;
    color: var(--teal);
    font-weight: 800;
    letter-spacing: 0.05em;
    text-shadow: 0 0 20px rgba(0, 212, 180, 0.2);
    font-family: var(--font-heading);
    z-index: 2;
}
.product-formula sub {
    font-size: 0.55em;
    vertical-align: sub;
    bottom: -0.2em;
    opacity: 0.8;
    margin-left: 1px;
}