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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 800px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 2rem;
}

.animation-container {
    width: 100%;
    height: 400px;
    background-color: #f8f8f8;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    overflow: hidden;
}

#animation {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

label {
    font-weight: 500;
    color: #555;
}

input[type="range"] {
    width: 100%;
    max-width: 400px;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: #4CAF50;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: #45a049;
}

#interval-value {
    font-size: 0.9rem;
    color: #666;
}