:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #f0f2f5;
    --text-color: #333;
    --white: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme='dark'] {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --white: #1e1e1e;
    --shadow-color: rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    margin: 0;
    padding: 40px 0;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    gap: 40px;
}

.contact-form {
    background-color: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    width: 320px;
}

.contact-form h2 {
    color: var(--primary-color);
    margin-top: 0;
    text-align: center;
}

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

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

.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: var(--background-color);
    color: var(--text-color);
    box-sizing: border-box;
}

.contact-form button {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.3s;
}

.contact-form button:hover {
    opacity: 0.9;
}

#comments-container {
    width: 90%;
    max-width: 600px;
    background-color: var(--white);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    box-sizing: border-box;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--white);
    color: var(--text-color);
    border: 1px solid var(--primary-color);
    padding: 10px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: all 0.3s;
}

.theme-toggle:hover {
    transform: scale(1.05);
}