body {
    margin: 0;
    padding: 0;
    background-color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: 'Arial', sans-serif;
    color: white;
}

#game-container {
    width: 400px;
    background-color: #000;
    border: 2px solid #fff;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

h1 {
    font-size: 2em;
    margin: 0 0 20px;
}

#counter {
    font-size: 3em;
    margin-bottom: 20px;
    letter-spacing: 10px;
}

#count-button {
    font-size: 1.5em;
    padding: 15px 30px;
    background-color: #f39c12;
    color: #fff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
}

#count-button:hover {
    background-color: #e67e22;
}

#fireworks {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

#special-counter {
    margin-top: 20px;
    text-align: center;
}

#special-icons {
    display: flex;
    justify-content: space-between;
    gap: 5px;
}

.special-icon {
    text-align: center;
    font-size: 0.8em;
}

.special-icon img {
    width: auto;
    height: 30px;
}

.flying {
    position: absolute;
    width: 50px;
    height: auto
}

/* アニメーション用 */
@keyframes flying-random {
    from {
        transform: translate(var(--start-x), var(--start-y));
    }
    to {
        transform: translate(var(--end-x), var(--end-y));
    }
}