:root {
    --bg-color: #f0f0f0;
    --container-bg: #ffffff;
    --text-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --button-bg: #4CAF50;
    --button-hover: #45a049;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --button-bg: #66bb6a;
    --button-hover: #81c784;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px var(--shadow-color);
    text-align: center;
    width: 90%;
    max-width: 400px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background-color: var(--text-color);
    color: var(--bg-color);
}

h1 {
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.menu-display {
    min-height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-color);
}

.menu-item {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

#generate-btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    font-weight: bold;
}

#generate-btn:hover {
    background-color: var(--button-hover);
}

#generate-btn:active {
    transform: scale(0.98);
}