:root {
    --primary-color: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --success-color: #10b981;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-sidebar: #1e293b;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-sidebar: #0f172a;
    --bg-overlay: rgba(0, 0, 0, 0.7);
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    
    --border-color: #334155;
    --border-light: #475569;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
    height: 100vh;
    overflow: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 顶部导航栏 */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 1000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}

.nav-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
}

.app-logo i {
    font-size: 1.4rem;
}

.nav-center {
    flex: 1;
    max-width: 600px;
    margin: 0 16px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.nav-center::-webkit-scrollbar {
    display: none;
}

.keyword-nav {
    display: flex;
    gap: 8px;
    padding: 4px;
}

.keyword {
    padding: 6px 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.keyword:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
}

/* 侧边栏 */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    transform: translateX(-100%);
    transition: var(--transition-slow);
    z-index: 900;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.sidebar.active {
    transform: translateX(0);
}

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

.sidebar-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-sidebar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-sidebar:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.sidebar-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.tool-section {
    margin-bottom: 30px;
}

.tool-section h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tool-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tool-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    text-decoration: none;
    border: 1px solid transparent;
}

.tool-item:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
    transform: translateX(4px);
    border-color: var(--border-color);
}

.tool-item.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    font-weight: 500;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tool-item i {
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
}

.history-section {
    margin-bottom: 30px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.section-header h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.icon-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius);
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--danger-color);
}

.history-list {
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    padding: 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    border: 1px solid transparent;
}

.history-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
    transform: translateX(4px);
}

.history-item i {
    color: var(--text-tertiary);
    min-width: 16px;
    font-size: 0.9rem;
}

.user-status {
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border-color);
}

.status-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.status-item:last-child {
    margin-bottom: 0;
}

.status-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.status-icon.mood {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    color: white;
}

.status-icon.stress {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.status-info {
    flex: 1;
}

.status-info span:first-child {
    display: block;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 2px;
}

.status-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 主内容区域 */
.main-content {
    margin-top: 80px;
    margin-left: 0;
    height: calc(100vh - 60px);
    display: flex;
    flex-direction: column;
    transition: var(--transition-slow);
    position: relative;
}

.sidebar.active ~ .main-content {
    margin-left: 280px;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    padding-bottom: 180px;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

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

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

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

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

.message {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease;
    max-width: 85%;
}

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

.user-message {
    flex-direction: row-reverse;
    margin-left: auto;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
    box-shadow: var(--shadow-sm);
}

.user-message .message-avatar {
    background: linear-gradient(135deg, var(--secondary-color), #34d399);
}

.message-content {
    position: relative;
    min-width: 0;
    max-width: calc(100% - 52px);
}

.user-message .message-content {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.message-text {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: var(--radius-lg);
    border-top-left-radius: 4px;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
    border: 1px solid var(--border-color);
}

.user-message .message-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: 4px;
    border-color: var(--primary-color);
}

.message-text p {
    margin-bottom: 8px;
}

.message-text p:last-child {
    margin-bottom: 0;
}

.message-text ul, .message-text ol {
    margin: 12px 0;
    padding-left: 24px;
}

.message-text li {
    margin-bottom: 6px;
}

/* 消息操作按钮 */
.message-actions {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    opacity: 0.6;
    transition: var(--transition);
}

.message-content:hover .message-actions {
    opacity: 1;
}

.action-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.action-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.action-btn.copy-btn:hover {
    background: var(--success-color);
    border-color: var(--success-color);
}

.action-btn.tts-btn:hover {
    background: var(--warning-color);
    border-color: var(--warning-color);
}

.action-btn.regenerate-btn:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.action-btn:disabled:hover {
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-color: var(--border-color);
    transform: none;
    box-shadow: none;
}

.highlight {
    color: var(--primary-color);
    font-weight: 600;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 6px;
    text-align: right;
}

.user-message .message-time {
    color: rgba(255, 255, 255, 0.7);
}

/* 输入区域 */
.input-container {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 16px;
    z-index: 100;
    transition: var(--transition-slow);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.sidebar.active ~ .input-container {
    left: 280px;
}

.upload-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
    gap: 12px;
}

.multimodal-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.modal-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}

.modal-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.text-input-wrapper {
    position: relative;
    display: flex;
    gap: 12px;
}

#message-input {
    flex: 1;
    min-height: 66px;
    max-height: 120px;
    padding: 6px 68px 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    transition: var(--transition);
    font-family: var(--font-sans);
}

#message-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

.send-btn {
    position: absolute;
    right: 12px;
    bottom: 12px;
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    border: none;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
    box-shadow: var(--shadow-sm);
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.ai-mode-selector {
    width: 140px;
    flex-shrink: 0;
}

#ai-mode {
    width: 100%;
    height: 44px;
    padding: 0 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

#ai-mode:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

.file-previews {
    display: flex;
    gap: 12px;
    margin-top: 12px;
    overflow-x: auto;
    padding: 4px;
    max-width: 100%;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.file-previews::-webkit-scrollbar {
    height: 4px;
}

.file-previews::-webkit-scrollbar-track {
    background: transparent;
}

.file-previews::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.file-preview {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: var(--radius);
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.file-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.audio-preview {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    padding: 10px;
    gap: 8px;
}

.audio-preview i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.audio-preview span {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    width: 100%;
}

.file-icon {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
}

.file-icon i {
    font-size: 2rem;
    color: var(--text-tertiary);
}

.remove-file {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--danger-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 12px;
    opacity: 0.9;
    transition: var(--transition);
    z-index: 10;
    border: 2px solid var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

.remove-file:hover {
    opacity: 1;
    transform: scale(1.1);
}

/* 模态框 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 400px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
    border: 1px solid var(--border-color);
}

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

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

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-modal {
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-modal:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    max-height: calc(90vh - 73px);
}

/* 音频上传模态框 */
.audio-upload-modal {
    padding: 10px 0;
}

.upload-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.upload-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 24px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    background: var(--bg-secondary);
}

.upload-option:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    border-style: solid;
}

.upload-option i {
    font-size: 2rem;
    color: var(--primary-color);
}

.upload-option span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.upload-tips {
    background: var(--bg-tertiary);
    padding: 12px 16px;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary-color);
}

.upload-tips p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.upload-tips p:last-child {
    margin-bottom: 0;
}

/* 打字指示器 */
.typing-indicator {
    position: absolute;
    bottom: 160px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    display: none;
    align-items: center;
    gap: 12px;
    z-index: 99;
    border: 1px solid var(--border-color);
}

.typing-indicator.active {
    display: flex;
    animation: slideUp 0.3s ease;
}

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

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
    animation: typing 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

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

.typing-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 通知 */
.notification {
    position: fixed;
    top: 80px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 12px 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 2001;
    display: none;
    align-items: center;
    gap: 10px;
    animation: slideInRight 0.3s ease;
    max-width: 300px;
    word-wrap: break-word;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

.notification.active {
    display: flex;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
    }
    
    .sidebar.active ~ .main-content,
    .sidebar.active ~ .input-container {
        margin-left: 0;
        left: 0;
    }
    
    .keyword-nav {
        display: none;
    }
    
    .message {
        max-width: 90%;
    }
    
    .upload-area {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .multimodal-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .ai-mode-selector {
        width: 100%;
    }
    
    #ai-mode {
        width: 100%;
    }
    
    .upload-options {
        grid-template-columns: 1fr;
    }
    
    .chat-container {
        padding: 16px;
        padding-bottom: 200px;
    }
    
    .typing-indicator {
        bottom: 180px;
        padding: 10px 20px;
        font-size: 0.85rem;
    }
    
    .notification {
        left: 16px;
        right: 16px;
        max-width: calc(100% - 32px);
        top: 76px;
    }
    
    .input-container {
        padding: 5px;
    }
    
    .modal-content {
        max-height: 85vh;
    }
}

@media (max-width: 480px) {
    .nav-left .app-logo span {
        display: none;
    }
    
    .nav-right {
        gap: 6px;
    }
    
    .nav-btn {
        width: 36px;
        height: 36px;
    }
    
    .message {
        max-width: 100%;
        gap: 8px;
    }
    
    .message-avatar {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .message-text {
        padding: 14px;
        font-size: 0.9rem;
    }
    
    .text-input-wrapper {
        flex-direction: column;
    }
    
    .ai-mode-selector {
        width: 100%;
    }
    
    #ai-mode {
        height: 30px;
    }
    
    .modal-btn {
        width: 30px;
        height: 30px;
        font-size: 1rem;
    }
    
    .chat-container {
        padding: 5px;
        padding-bottom: 220px;
    }
    
    .message-actions {
        gap: 6px;
    }
    
    .action-btn {
        width: 30px;
        height: 30px;
        font-size: 0.85rem;
    }
}

/* 滚动条样式优化 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 打印样式 */
@media print {
    .top-nav,
    .input-container,
    .typing-indicator,
    .notification {
        display: none !important;
    }
    
    .main-content {
        margin-top: 0;
        height: auto;
    }
    
    .chat-container {
        padding: 0;
        overflow: visible;
        height: auto;
    }
}