/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* 登录页面 */
.login-container {
    width: 100%;
    max-width: 400px;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.login-box h1 {
    color: #333;
    margin-bottom: 8px;
    font-size: 28px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin-bottom: 30px;
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: #333;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.error-message {
    color: #e74c3c;
    font-size: 14px;
    margin-bottom: 15px;
    display: none;
}

.error-message.show {
    display: block;
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-small {
    padding: 8px 12px;
    font-size: 16px;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: opacity 0.3s;
}

.btn-small:hover {
    opacity: 0.7;
}

/* 聊天页面 */
.chat-container {
    width: 100%;
    max-width: 800px;
    height: 90vh;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.header-actions .btn-small {
    color: white;
}

/* 消息区域 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #f8f9fa;
}

.message {
    margin-bottom: 16px;
    display: flex;
}

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
    background: white;
    color: #333;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.message.system .message-content {
    background: #fff3cd;
    color: #856404;
    text-align: center;
    max-width: 100%;
    font-size: 13px;
}

.message.command .message-content {
    background: #e7f3ff;
    color: #004085;
    text-align: center;
    max-width: 100%;
    font-size: 13px;
    white-space: pre-wrap;
}

.message.proactive .message-content {
    background: #fff;
    color: #333;
    border-left: 3px solid #667eea;
    font-style: italic;
}

/* 输入区域 */
.chat-input-container {
    border-top: 1px solid #e0e0e0;
    padding: 16px;
    background: white;
}

.system-message {
    color: #667eea;
    font-size: 13px;
    text-align: center;
    margin-bottom: 8px;
    min-height: 20px;
}

.chat-form {
    display: flex;
    gap: 12px;
}

.chat-form input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 24px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.chat-form input:focus {
    outline: none;
    border-color: #667eea;
}

.chat-form .btn-primary {
    width: auto;
    padding: 12px 24px;
}

/* 加载状态 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    border-top-color: #667eea;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 0;
    }
    
    .chat-container {
        height: 100vh;
        border-radius: 0;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .chat-header h2 {
        font-size: 18px;
    }
}

/* 滚动条样式 */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}