body {
    font-family: Arial, sans-serif;
    background-color: #121212;
    color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px;
}
h1 { color: #e0e0e0; }
.info { color: #888; margin-bottom: 20px; font-size: 14px; }

.heatmap-container {
    display: grid;
    grid-template-columns: 60px repeat(5, 80px);
    gap: 4px;
    margin-top: 10px;
}
.cell {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 60px;
    font-size: 14px;
    font-weight: bold;
    border-radius: 4px;
    transition: transform 0.2s;
}
.cell:hover {
    transform: scale(1.05);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255,255,255,0.2);
}
.header { background-color: #333333; color: #aaaaaa; }
.empty { background-color: transparent; }
.neutral { background-color: #424242; color: #777777; }

button {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #1976d2;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
button:hover { background-color: #1565c0; }