body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
    transition: background-color 0.5s, color 0.5s;
}

.main-container {
    text-align: center;
    padding: 2rem;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.number-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 1rem;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #eee;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
}

#generate-btn {
    margin-top: 1.5rem;
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

#generate-btn:hover {
    background-color: #45a049;
}

/* Dark Mode */
body.dark-mode {
    background-color: #333;
    color: #fff;
}

.dark-mode .main-container {
    background-color: #444;
}

.dark-mode .number {
    background-color: #555;
}

.dark-mode #generate-btn, .dark-mode #submit-btn {
    background-color: #555;
}

.dark-mode #generate-btn:hover, .dark-mode #submit-btn:hover {
    background-color: #666;
}

.dark-mode .contact-section input, .dark-mode .contact-section textarea {
    background-color: #555;
    border-color: #666;
    color: #fff;
}

hr {
    margin: 2rem 0;
    border: none;
    border-top: 1px solid #eee;
}

.dark-mode hr {
    border-top: 1px solid #555;
}

.contact-section {
    text-align: left;
    margin-top: 1rem;
}

.contact-section h2 {
    text-align: center;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box;
    font-family: inherit;
}

.form-group textarea {
    height: 100px;
    resize: vertical;
}

#submit-btn {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    background-color: #2196F3;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

#submit-btn:hover {
    background-color: #1e88e5;
}

#form-status {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
}

#form-status.success {
    color: #4CAF50;
}

#form-status.error {
    color: #f44336;
}