:root {
    --bg-color: #f0f2f5;
    --container-bg: #fff;
    --text-color: #333;
    --heading-color: #e63946;
    --display-bg: #f8f9fa;
    --display-border: #ccc;
    --btn-bg: #457b9d;
    --btn-hover: #1d3557;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --heading-color: #ff4d4d;
    --display-bg: #2d2d2d;
    --display-border: #444;
    --btn-bg: #345e77;
    --btn-hover: #5a91b1;
}

@keyframes spin {
    0% { transform: rotateY(0deg); opacity: 0.5; }
    25% { transform: rotateY(90deg); opacity: 1; }
    50% { transform: rotateY(180deg); opacity: 0.5; }
    75% { transform: rotateY(270deg); opacity: 1; }
    100% { transform: rotateY(360deg); opacity: 0.5; }
}

.spinning {
    animation: spin 0.5s infinite linear;
    perspective: 1000px;
    backface-visibility: hidden;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    position: relative;
    text-align: center;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 400px;
    transition: background-color 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
}

#theme-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    padding: 5px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

#theme-btn:hover {
    transform: scale(1.1);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--heading-color);
}

#food-display {
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--display-bg);
    border-radius: 8px;
    border: 2px dashed var(--display-border);
    min-height: 50px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#pick-food {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#pick-food:hover {
    background-color: var(--btn-hover);
    transform: translateY(-2px);
}

#pick-food:active {
    transform: translateY(0);
}

#pick-food:disabled {
    background-color: #666;
    cursor: not-allowed;
    transform: none;
}