/* css/evolution.css */
.biomass-text {
    color: #00ffaa;
    font-weight: 900;
    font-size: 1.5rem;
    text-shadow: 0 0 10px rgba(0, 255, 170, 0.3);
}

.skill-tree-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.skill-card {
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 250px;
}

.skill-card:hover {
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-5px);
}

.skill-card.unlocked {
    border-color: #00ffaa;
    box-shadow: 0 0 15px rgba(0, 255, 170, 0.2);
    background: rgba(0, 255, 170, 0.05);
}

.skill-card.unlocked .skill-title {
    color: #00ffaa;
    text-shadow: 0 0 10px rgba(0, 255, 170, 0.5);
}

.skill-title {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    color: #fff;
}

.skill-desc {
    color: #bbb;
    font-size: 0.9rem;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.skill-status {
    margin-top: 1rem;
    font-weight: 900;
    font-size: 1.1rem;
}

.status-owned {
    color: #00ffaa;
}

.status-cost {
    color: gold;
}

.btn-buy {
    margin-top: 1rem;
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid #00ffaa;
    background: rgba(0, 255, 170, 0.1);
    color: #00ffaa;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s ease;
    width: 100%;
    text-transform: uppercase;
}

.btn-buy:hover:not(:disabled) {
    background: rgba(0, 255, 170, 0.3);
    box-shadow: 0 0 15px rgba(0, 255, 170, 0.6);
}

.btn-buy:disabled {
    border-color: #555;
    color: #555;
    background: rgba(0, 0, 0, 0.5);
    cursor: not-allowed;
    box-shadow: none;
}