:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --btn-generate: #007bff;
    --btn-copy: #28a745;
    --btn-text: #ffffff;
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

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

.container {
    text-align: center;
    background-color: var(--container-bg);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 20px var(--shadow-color), 0 6px 6px var(--shadow-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    color: var(--text-color);
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.button-container {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

#generate-btn, #copy-btn, #theme-toggle {
    padding: 0.8rem 2rem;
    font-size: 1rem;
    color: var(--btn-text);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

#generate-btn {
    background-color: var(--btn-generate);
    box-shadow: 0 4px 6px rgba(0, 123, 255, 0.3);
}

#copy-btn {
    background-color: var(--btn-copy);
    box-shadow: 0 4px 6px rgba(40, 167, 69, 0.3);
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: #6c757d;
    padding: 0.5rem 1rem;
}

#generate-btn:hover, #copy-btn:hover, #theme-toggle:hover {
    transform: translateY(-2px);
}

#generate-btn:active, #copy-btn:active, #theme-toggle:active {
    transform: translateY(0);
}

#generate-btn:hover {
    box-shadow: 0 6px 12px rgba(0, 123, 255, 0.4);
}

#copy-btn:hover {
    box-shadow: 0 6px 12px rgba(40, 167, 69, 0.4);
}