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

/* CSS变量定义 */
:root {
    --primary-color: #10a37f;
    --secondary-color: #202123;
    --sidebar-bg: #202123;
    --main-bg: #343541;
    --message-bg: #444654;
    --user-message-bg: #0a7ea4;
    --text-color: #e5e5e5;
    --text-light: #9ca3af;
    --border-color: #444654;
    --hover-color: #343541;
    --error-color: #ef4444;
    --input-bg: #40414f;
    --input-text: #e5e5e5;
    --welcome-bg: #343541;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--main-bg);
    color: var(--text-color);
    line-height: 1.6;
    overflow: hidden;
}

/* 整体布局 */
.app-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    height: 100vh;
    overflow: hidden;
}

/* 侧边栏样式 */
.sidebar {
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.new-chat-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.new-chat-btn:hover {
    background-color: var(--hover-color);
    border-color: var(--primary-color);
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-list::-webkit-scrollbar {
    width: 6px;
}

.chat-list::-webkit-scrollbar-track {
    background: transparent;
}

.chat-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.chat-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

.chat-item {
    background-color: transparent;
    color: var(--text-color);
    border: none;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
    width: 100%;
    cursor: pointer;
    font-size: 14px;
    text-align: left;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    transition: all 0.2s ease;
    position: relative;
}

.chat-item:hover {
    background-color: var(--hover-color);
}

.chat-item.active {
    background-color: var(--hover-color);
    border-left: 3px solid var(--primary-color);
}

.chat-item-preview {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.delete-chat-btn {
    background: transparent;
    color: var(--text-light);
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.2s ease;
}

.chat-item:hover .delete-chat-btn {
    opacity: 1;
}

.delete-chat-btn:hover {
    color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.1);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.settings-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.settings-btn:hover {
    background-color: var(--hover-color);
    border-color: var(--primary-color);
}

/* 主内容区域样式 */
.main-content {
    background-color: var(--main-bg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-color);
}

.clear-chat-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.clear-chat-btn:hover {
    background-color: var(--hover-color);
    border-color: var(--error-color);
    color: var(--error-color);
}

/* 对话消息区域 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

/* 欢迎消息样式 */
.welcome-message {
    text-align: center;
    padding: 60px 20px;
    background-color: var(--welcome-bg);
    border-radius: 12px;
    color: var(--text-light);
}

.welcome-message i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.welcome-message h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.welcome-message p {
    font-size: 16px;
    color: var(--text-light);
}

/* 消息样式 */
.message {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-avatar {
    background-color: var(--user-message-bg);
}

.ai-avatar {
    background-color: var(--primary-color);
}

.message-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
}

.user-message-header {
    color: var(--text-color);
}

.ai-message-header {
    color: var(--primary-color);
}

.message-text {
    font-size: 16px;
    color: var(--text-color);
    line-height: 1.6;
    white-space: pre-wrap;
}

.message-bubble {
    background-color: var(--message-bg);
    padding: 16px;
    border-radius: 8px;
    max-width: 100%;
}

.user-message .message-bubble {
    background-color: var(--user-message-bg);
}

/* 加载状态 */
.loading-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
    font-size: 14px;
}

.loading-dots {
    display: flex;
    gap: 4px;
}

.loading-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-light);
    animation: loading 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes loading {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* 输入区域样式 */
.chat-input-container {
    padding: 24px;
    background-color: var(--main-bg);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    background-color: var(--input-bg);
    border-radius: 12px;
    padding: 8px;
    display: flex;
    align-items: flex-end;
    gap: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    position: relative;
}

#messageInput {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--input-text);
    font-size: 16px;
    padding: 12px 16px;
    resize: none;
    max-height: 200px;
    overflow-y: auto;
}

#messageInput::placeholder {
    color: var(--text-light);
}

#messageInput::-webkit-scrollbar {
    width: 6px;
}

#messageInput::-webkit-scrollbar-track {
    background: transparent;
}

#messageInput::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.send-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.send-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.send-btn:disabled {
    background-color: var(--text-light);
    cursor: not-allowed;
    transform: none;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--secondary-color);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-color);
}

.close-btn {
    background: transparent;
    color: var(--text-light);
    border: none;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.close-btn:hover {
    background-color: var(--hover-color);
    color: var(--text-color);
}

.modal-body {
    padding: 24px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--input-bg);
    color: var(--input-text);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(16, 163, 127, 0.2);
}

.input-with-toggle {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    color: var(--text-light);
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.toggle-password:hover {
    color: var(--text-color);
    background-color: var(--hover-color);
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.cancel-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.cancel-btn:hover {
    background-color: var(--hover-color);
}

.save-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.save-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* 错误提示样式 */
.error-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--error-color);
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    max-width: 90%;
}

.error-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.close-error {
    background: transparent;
    color: white;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    font-size: 16px;
    transition: all 0.2s ease;
}

.close-error:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: none;
    }
    
    .sidebar.mobile-show {
        display: flex;
        position: fixed;
        left: 0;
        top: 0;
        width: 100%;
        height: 100vh;
        z-index: 1000;
    }
    
    .chat-header {
        padding: 16px;
    }
    
    .chat-messages {
        padding: 16px;
    }
    
    .chat-input-container {
        padding: 16px;
    }
    
    .welcome-message {
        padding: 40px 16px;
    }
    
    .modal-content {
        margin: 16px;
    }
}

@media (max-width: 480px) {
    .chat-title {
        font-size: 18px;
    }
    
    .message-text {
        font-size: 14px;
    }
    
    .send-btn {
        padding: 10px 14px;
    }
    
    .clear-chat-btn {
        padding: 6px 12px;
        font-size: 13px;
    }
}