:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --card-background-color: #ffffff;
    --text-color: #212529;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(0, 123, 255, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    background-image: subtle-noise-texture.png;
}

#app {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

main {
    background-color: var(--card-background-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px var(--shadow-color);
}

image-uploader, loading-spinner, results-card {
    display: block;
    margin: 0 auto;
}

loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--secondary-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}