/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

/* 认证页面样式 */
.auth-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 20px;
}

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

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

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

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

.success {
    background-color: #e8f5e9;
    color: #2e7d32;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}

/* 聊天界面样式 */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.chat-header {
    background-color: #4CAF50;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logout-btn {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.chat-main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 250px;
    background-color: #f9f9f9;
    border-right: 1px solid #ddd;
    padding: 15px;
    overflow-y: auto;
}

.sidebar h3 {
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #ddd;
}

.user {
    display: flex;
    align-items: center;
    padding: 8px 0;
}

.status {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 10px;
}

.status.online {
    background-color: #4CAF50;
}

.status.offline {
    background-color: #ccc;
}

.chat-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.messages-container {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    background-color: white;
}

.message {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 4px;
    background-color: #f9f9f9;
}

.message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 14px;
}

.sender {
    font-weight: bold;
}

.time {
    color: #888;
}

.message-input {
    padding: 15px;
    background-color: #f9f9f9;
    border-top: 1px solid #ddd;
}

#message-form {
    display: flex;
    gap: 10px;
}

#message-input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .chat-main {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #ddd;
        max-height: 150px;
    }
    
    .auth-container {
        margin: 20px;
        width: auto;
    }
}