.panel {
    text-align: center;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    justify-content: center;
    align-items: center;
    margin-bottom: 12px;
}

.controls label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #ffffff;
    border: 1px solid #ddd;
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 14px;
}

.controls button {
    font-size: 14px;
    padding: 8px 14px;
}

#simulationCanvas {
    width: 100%;
    max-width: 900px;
    height: auto;
    border: 1px solid #b7b7b7;
    border-radius: 8px;
    background: linear-gradient(180deg, #f9fff7, #eef7ff);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.stats {
    margin-top: 12px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 14px;
    font-size: 14px;
}

.stats span {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 999px;
    padding: 4px 10px;
}

.description {
    margin: 14px auto;
    max-width: 880px;
}

.graphPanel {
    margin-top: 14px;
}

.graphPanel h2 {
    margin: 10px 0 8px;
    font-size: 18px;
}

#historyCanvas {
    width: 100%;
    max-width: 900px;
    height: auto;
    border: 1px solid #b7b7b7;
    border-radius: 8px;
    background: #fbfcff;
}

.legend {
    margin-top: 8px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 10px;
    font-size: 13px;
}

.lg {
    border: 1px solid #ddd;
    border-radius: 999px;
    background: #fff;
    padding: 3px 10px;
}

.lg.herb {
    border-color: #23a647;
    color: #1b7a35;
}

.lg.carn {
    border-color: #d44949;
    color: #a23434;
}

.lg.plant {
    border-color: #1f7f7f;
    color: #145959;
}

.lg.hs {
    border-color: #6a58cc;
    color: #4a3ba5;
}

.lg.cs {
    border-color: #d99625;
    color: #9a6813;
}