:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --container-bg: transparent;
    --circle-bg: #fff;
    --circle-border: #ccc;
    --btn-bg: #e0e0e0;
    --btn-text: #000;
}

body.dark {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --circle-bg: #333;
    --circle-border: #555;
    --btn-bg: #444;
    --btn-text: #fff;
}

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;
}

.container {
    text-align: center;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 20px;
    border: 1px solid var(--circle-border);
    background-color: var(--btn-bg);
    color: var(--btn-text);
}

#generator-btn {
    padding: 10px 20px;
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 8px;
    border: 1px solid var(--circle-border);
    background-color: var(--btn-bg);
    color: var(--btn-text);
}

#numbers-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 20px;
    margin-bottom: 40px;
}

.contact-section {
    margin-top: 50px;
    padding: 30px;
    border: 1px solid var(--circle-border);
    border-radius: 12px;
    background-color: var(--circle-bg);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.contact-section h2 {
    margin-bottom: 20px;
}

.form-group {
    text-align: left;
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--circle-border);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
}

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

.submit-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: 1px solid var(--circle-border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.2s;
}

.submit-btn:hover {
    opacity: 0.8;
}

.form-notice {
    font-size: 0.8rem;
    margin-top: 15px;
    color: var(--text-color);
    opacity: 0.7;
}

.number-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--circle-bg);
    border: 2px solid var(--circle-border);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    margin: 5px;
    color: var(--text-color);
}