body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: #1a1a1a;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    text-align: center;
    padding: 20px 0;
    background-color: rgba(26, 26, 26, 0.9);
}

h1 {
    color: #ffffff;
    margin: 0;
    font-family:Consolas, monospace;
    font-size: 1.2em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    font-weight: 500;
}

#sigma-container {
    width: 100%;
    height: 100%;
    background-color: #f5f5f5;
}

#graph-container {
    width: 100%;
    height: 100%;
}

#filter-buttons {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    gap: 10px;
    background-color: rgba(26, 26, 26, 0.8);
    padding: 10px;
    border-radius: 20px;
}

.filter-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 15px;
    background-color: #333;
    color: white;
    cursor: pointer;
    font-size: 14px;
    font-family: Consolas, monospace;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background-color: #444;
}

.filter-btn.active {
    background-color: #666;
}

/* スマートフォン向けのスタイル */
@media screen and (max-width: 768px) {
    h1 {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 5px;
    }
    
    #graph-container text {
        font-size: 10px !important;
    }
    
    #graph-container image {
        transform: scale(0.6);
    }
}