/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
}

/* 登录页面样式 */
.login-container {
    max-width: 400px;
    margin: 50px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.login-container h1 {
    margin-bottom: 20px;
    color: #4285f4;
}

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

.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: 10px;
    background-color: #4285f4;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #3367d6;
}

.error {
    color: #d32f2f;
    margin-bottom: 15px;
}

/* 聊天页面样式 */
.chat-container {
    max-width: 800px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

header {
    padding: 15px;
    background-color: #4285f4;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 20px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logout-btn, .clear-btn {
    color: white;
    text-decoration: none;
    font-size: 14px;
    padding: 5px 10px;
    border-radius: 4px;
    background-color: rgba(255, 255, 255, 0.2);
}

.logout-btn:hover, .clear-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.chat-messages {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    background-color: #f9f9f9;
}

.message {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 8px;
    max-width: 70%;
    word-wrap: break-word;
}

.message.sent {
    background-color: #e3f2fd;
    margin-left: auto;
}

.message.received {
    background-color: #f1f1f1;
    margin-right: auto;
}

.message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 12px;
    color: #666;
}

.message-content {
    font-size: 16px;
}

.message-form {
    display: flex;
    padding: 15px;
    background-color: #fff;
    border-top: 1px solid #ddd;
}

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

.message-form button {
    width: auto;
    margin-left: 10px;
    padding: 10px 20px;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .login-container {
        margin: 20px;
    }
    
    .chat-container {
        max-width: 100%;
    }
    
    .message {
        max-width: 85%;
    }
    
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .user-info {
        width: 100%;
        justify-content: space-between;
    }
}