:root {
    --bg-color: #f0f0f0;
    --container-bg: transparent;
    --text-color: #333;
    --number-bg: #fff;
    --number-border: #ccc;
    --button-bg: #e0e0e0;
    --button-text: #333;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #f0f0f0;
    --number-bg: #1e1e1e;
    --number-border: #444;
    --button-bg: #333;
    --button-text: #f0f0f0;
}

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;
    padding: 20px;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

.numbers {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    justify-content: center;
    flex-wrap: wrap;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    border: 2px solid var(--number-border);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    transition: background-color 0.3s, border-color 0.3s;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    cursor: pointer;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: 1px solid var(--number-border);
    border-radius: 8px;
    transition: background-color 0.3s, color 0.3s;
}

button:hover {
    opacity: 0.9;
}

.divider {
    margin: 40px 0;
    border: 0;
    border-top: 1px solid var(--number-border);
}

.contact-section {
    max-width: 400px;
    margin: 0 auto;
    text-align: left;
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-size: 14px;
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    padding: 10px;
    border-radius: 5px;
    border: 1px solid var(--number-border);
    background-color: var(--number-bg);
    color: var(--text-color);
    font-family: inherit;
}

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

.submit-btn {
    width: 100%;
    margin-top: 10px;
}