:root {
    --bg-color: #f0f2f5;
    --container-bg: white;
    --text-color: #333;
    --button-bg: #007bff;
    --button-hover: #0056b3;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #18191a;
    --container-bg: #242526;
    --text-color: #e4e6eb;
    --button-bg: #2d88ff;
    --button-hover: #4e9eff;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    padding: 20px 0;
}

.container {
    position: relative;
    text-align: center;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
    width: 100%;
    max-width: 450px;
}

/* ... (h1 and #theme-toggle remains same) */

.contact-section {
    margin-top: 40px;
    text-align: left;
}

.contact-section hr {
    border: none;
    border-top: 1px solid var(--shadow-color);
    margin-bottom: 30px;
}

.contact-section h3 {
    text-align: center;
    margin-bottom: 20px;
}

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

.form-group input, 
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background-color: var(--container-bg);
    color: var(--text-color);
    box-sizing: border-box;
    font-size: 1rem;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    border-color: #444;
}

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

.submit-button {
    width: 100%;
    padding: 12px;
    background-color: var(--text-color);
    color: var(--container-bg);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: opacity 0.3s;
}

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

.comments-section {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--shadow-color);
}

#numbers-container {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    justify-content: center;
    min-height: 70px;
}

#generate-button {
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

#generate-button:hover {
    background-color: var(--button-hover);
}

#generate-button:active {
    transform: scale(0.98);
}