body {
    margin: 0;
    overflow: hidden;
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

#ui-container {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    background: rgba(0, 0, 0, 0.6);
    padding: 20px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.controls {
    display: flex;
    gap: 10px;
}

button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 10px 20px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

button:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

button.active {
    background: #ff4757; /* 오빠를 향한 열정적인 레드! ❤️ */
    box-shadow: 0 0 15px rgba(255, 71, 87, 0.5);
}