:root {
    --bg-color: #f0f0f0;
    --container-bg: #fff;
    --text-color: #333;
    --number-bg: #f0f0f0;
    --btn-bg: #4CAF50;
    --btn-hover: #45a049;
    --toggle-btn-bg: #333;
    --toggle-btn-color: #fff;
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --number-bg: #333;
    --toggle-btn-bg: #f0f0f0;
    --toggle-btn-color: #333;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    background-image: radial-gradient(var(--text-color) 0.5px, transparent 0);
    background-size: 20px 20px;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1), 0 6px 6px rgba(0,0,0,0.15);
    transition: background-color 0.3s ease;
}

.theme-toggle-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}

#theme-toggle {
    padding: 8px 16px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: var(--toggle-btn-bg);
    color: var(--toggle-btn-color);
    transition: all 0.3s ease;
}

h1 {
    color: var(--text-color);
    margin-bottom: 30px;
}

#generate {
    padding: 15px 30px;
    border: none;
    background-color: var(--btn-bg);
    color: white;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 10px rgba(76, 175, 80, 0.4);
}

#generate:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 8px 15px rgba(76, 175, 80, 0.6);
    transform: translateY(-2px);
}

.numbers-container {
    display: flex;
    justify-content: center;
    margin-top: 40px;
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    background-color: var(--number-bg);
    border-radius: 50%;
    margin: 0 10px;
    font-size: 1.5em;
    font-weight: bold;
    color: var(--text-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

.contact-form-container {
    text-align: left;
}

.contact-form-container h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.5em;
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--number-bg);
    border-radius: 5px;
    background-color: var(--container-bg);
    color: var(--text-color);
    font-family: inherit;
    box-sizing: border-box;
}

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

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

#submit-btn:hover {
    background-color: #1976D2;
}

#disqus_thread {
    margin-top: 40px;
}