* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid #ddd;
    margin-bottom: 20px;
}

.login-section {
    text-align: right;
}

main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.comments-section {
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h1, h2, h3 {
    margin-bottom: 15px;
}

.btn {
    display: inline-block;
    background-color: #4CAF50;
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
}

.btn:hover {
    background-color: #45a049;
}

.add-comment {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.add-comment textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    min-height: 100px;
    margin-bottom: 10px;
    resize: vertical;
}

.comments-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.comment {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 4px;
    border-left: 3px solid #4CAF50;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 14px;
}

.username {
    font-weight: bold;
    color: #4CAF50;
}

.date {
    color: #888;
}

.comment-body {
    line-height: 1.5;
}

.login-form {
    max-width: 500px;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

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

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

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.error-message {
    background-color: #ffebee;
    color: #c62828;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}

footer {
    margin-top: 30px;
    text-align: center;
    color: #888;
    padding: 20px 0;
    border-top: 1px solid #ddd;
}