h1 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-dim);
}

.substance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.substance-card {
    background-color: var(--bg-alt);
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    display: flex;
    align-content: center;
    justify-content: center;
    flex-wrap: wrap;
    min-height: 80px;
}

.substance-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.substance-name {
    font-size: 20px;
    font-weight: bold;
    margin: 10px 0;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    word-break: break-word;
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    .substance-name { font-size: 16px; }
    .substance-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
}