body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    color: #111;
    transition: background-color 0.3s, color 0.3s;
}

body.dark {
    background-color: #1a1a2e;
    color: #e0e0e0;
}

.container {
    text-align: center;
}

.number-container {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #fff;
    border: 2px solid #ccc;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 5px;
    font-size: 20px;
    font-weight: bold;
    color: #111;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

body.dark .number {
    background-color: #16213e;
    border-color: #0f3460;
    color: #e0e0e0;
}

#generate-btn {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    background-color: #4a90e2;
    color: #fff;
    transition: background-color 0.3s;
}

#generate-btn:hover {
    background-color: #357abd;
}

body.dark #generate-btn {
    background-color: #0f3460;
}

body.dark #generate-btn:hover {
    background-color: #1a5276;
}

#theme-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    border: 2px solid #ccc;
    border-radius: 20px;
    background-color: #fff;
    color: #111;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body.dark #theme-toggle {
    background-color: #16213e;
    color: #e0e0e0;
    border-color: #0f3460;
}

.contact-link {
    display: inline-block;
    margin-top: 24px;
    padding: 8px 20px;
    font-size: 14px;
    color: #4a90e2;
    border: 1.5px solid #4a90e2;
    border-radius: 20px;
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
}

.contact-link:hover {
    background-color: #4a90e2;
    color: #fff;
}

body.dark .contact-link {
    color: #7eb8f7;
    border-color: #7eb8f7;
}

body.dark .contact-link:hover {
    background-color: #0f3460;
    color: #e0e0e0;
    border-color: #0f3460;
}