* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 90vw;
    max-width: 800px;
    height: 90vh;
    max-height: 600px;
}

#animal {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: opacity 0.8s ease-in-out;
}

#animal.fade-out {
    opacity: 0;
}

#startBtn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px 40px;
    font-size: 24px;
    font-weight: 600;
    color: white;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    border-radius: 50px;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    z-index: 10;
}

#startBtn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%) scale(1.05);
}

#startBtn:active {
    transform: translate(-50%, -50%) scale(0.95);
}

#startBtn.hidden {
    display: none;
}