/* CSS Variables for Theme */
:root {
  /* Primary Colors - Modern Gradient Palette */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  
  /* Background Colors - Glassmorphism Style */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-sidebar: #0f172a;
  --bg-hover: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.95);
  --bg-glass-dark: rgba(15, 23, 42, 0.95);
  --bg-glass-light: rgba(248, 250, 252, 0.95);
  
  /* Text Colors */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-white: #ffffff;
  
  /* Border Colors */
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-dark: #94a3b8;
  --border-glass: rgba(255, 255, 255, 0.2);
  
  /* Status Colors */
  --success: #10b981;
  --success-color: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --error-color: #ef4444;
  --info: #3b82f6;
  --danger-color: #ef4444;
  
  /* Shadows - Enhanced for depth */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  --shadow-neon: 0 0 20px rgba(99, 102, 241, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Dark Theme - Enhanced */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-hover: #334155;
  --bg-glass: rgba(15, 23, 42, 0.95);
  --bg-glass-dark: rgba(30, 41, 59, 0.95);
  --bg-glass-light: rgba(51, 65, 85, 0.95);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --border-light: #334155;
  --border-medium: #475569;
  --border-dark: #64748b;
  --border-glass: rgba(255, 255, 255, 0.1);
  
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -2px rgba(0, 0, 0, 0.5);
  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  --shadow-neon: 0 0 20px rgba(99, 102, 241, 0.4);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--text-white);
  overflow: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* Selection Styles */
::selection {
  background: var(--primary-color);
  color: var(--text-white);
}

::-moz-selection {
  background: var(--primary-color);
  color: var(--text-white);
}

/* Analysis Options */
.analysis-options {
  margin-top: 15px;
  padding: 15px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--primary-color);
}

.analysis-options h4 {
  margin-top: 0;
  color: var(--text-primary);
  font-weight: 600;
}

.analysis-options .btn {
  flex: 1;
  min-width: 120px;
  margin: 5px;
  padding: 10px 15px;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.analysis-options .btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.analysis-options .btn-primary {
  background: var(--primary-gradient);
  color: white;
  border: none;
}

.analysis-options .btn-secondary {
  background: var(--secondary-gradient);
  color: white;
  border: none;
}

.analysis-options .btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.analysis-options .btn-outline:hover {
  background: var(--bg-hover);
}

.analysis-options p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
}

/* App Container */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: none;
  border-radius: 0;
  margin: 0;
  box-shadow: none;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background: var(--bg-glass-dark);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-normal);
  z-index: 1000;
  border-right: 1px solid var(--border-glass);
  position: relative;
}

.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  pointer-events: none;
  z-index: -1;
}

.sidebar.collapsed {
  width: 80px;
}

.sidebar-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--text-white);
  font-size: 1.25rem;
  font-weight: 600;
  position: relative;
  animation: logoGlow 3s ease-in-out infinite alternate;
}

@keyframes logoGlow {
  0% {
    text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
  }
  100% {
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.8), 0 0 30px rgba(139, 92, 246, 0.6);
  }
}

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

.sidebar-nav {
  flex: 1;
  padding: var(--spacing-lg) 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-xl);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  border-radius: var(--radius-lg);
  margin: 0 var(--spacing-md) var(--spacing-sm) var(--spacing-md);
  overflow: hidden;
}

.nav-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left var(--transition-normal);
}

.nav-item:hover::before {
  left: 100%;
}

.nav-item:hover {
  color: var(--text-white);
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(4px);
  box-shadow: var(--shadow-neon);
}

.nav-item.active {
  color: var(--text-white);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3) 0%, rgba(139, 92, 246, 0.3) 100%);
  box-shadow: var(--shadow-neon);
  transform: translateX(4px);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--primary-gradient);
  border-radius: var(--radius-sm);
}

.nav-item i {
  font-size: 1.125rem;
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Sidebar File Upload Section */
.sidebar-upload-section {
  padding: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.upload-section-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-white);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  font-size: 0.95rem;
}

.upload-section-header i {
  color: var(--primary-light);
}

.sidebar-upload-area {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-fast);
}

.sidebar-upload-area:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.sidebar-upload-title {
  color: var(--text-white);
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
}

.sidebar-upload-description {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.sidebar-upload-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  justify-content: center;
}

.sidebar-upload-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.sidebar-file-info {
  margin-top: var(--spacing-sm);
}

.sidebar-file-info .file-info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-white);
}

.sidebar-file-info .file-info-item i {
  color: var(--success);
  font-size: 0.8rem;
}

.sidebar-file-info .file-info-item span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
}

.sidebar-file-info .remove-file-btn {
  background: none;
  border: none;
  color: var(--error-color);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 2px;
  font-size: 0.7rem;
  transition: all var(--transition-fast);
}

.sidebar-file-info .remove-file-btn:hover {
  background: var(--error-color);
  color: white;
}

/* Collapsed sidebar adjustments */
.sidebar.collapsed .sidebar-upload-section {
  display: none;
}

/* File Management Layout - Three columns side by side */
.file-management-layout-three {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr; /* 三列：上传1 | 上传2 | 文件列表 */
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-shrink: 0;
  align-items: start;
}

.file-management-layout-four {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-shrink: 0;
  align-items: start;
}

@media (max-width: 1400px) {
  .file-management-layout-four {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .file-management-layout-four {
    grid-template-columns: 1fr;
  }
}

/* Upload column wrapper */
.upload-column {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Upload area styling */
.upload-area {
  background: var(--bg-primary);
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 320px; /* 固定高度 */
  box-sizing: border-box;
  box-shadow: var(--shadow-sm);
}

.upload-area:hover {
  border-color: var(--primary-color);
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.upload-area.dragover {
  border-color: var(--primary-color);
  background: var(--primary-color);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(37, 99, 235, 0.05) 100%);
}

.upload-title {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
}

.upload-description {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1.4;
}

.upload-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  white-space: nowrap;
}

.upload-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.upload-btn:active {
  transform: translateY(0);
}

.file-info {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  display: none;
  font-size: 0.8rem;
  flex-shrink: 0; /* 防止被压缩 */
}

.file-info.show {
  display: block;
}

.file-info-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

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

.file-info-item i {
  color: var(--primary-color);
  width: 16px;
  text-align: center;
}

.file-info-item .file-name {
  font-weight: 500;
  flex: 1;
}

.file-info-item .file-size {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.file-info-item .file-status {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

.file-info-item .file-status.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.file-info-item .file-status.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

.file-info-item .file-status.uploading {
  background: rgba(59, 130, 246, 0.1);
  color: var(--info);
}

.model-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-white);
  font-size: 0.875rem;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

/* Main Content Area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 0;
  margin: 0;
  box-shadow: none;
  min-height: 0; /* 确保flex容器可以收缩 */
}

/* Top Bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-glass);
  height: 70px;
  position: relative;
  overflow: visible;
  flex-shrink: 0; /* 防止头部被压缩 */
  z-index: 10000; /* Ensure header is above hero section and content */
}

.top-bar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
  opacity: 0.7;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.top-bar-right {
  display: flex;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  z-index: 10002; /* Ensure user info menu is above other elements */
}

.user-info:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.user-info i {
  font-size: 1.5rem;
}

/* View Containers */
.view-container {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0; /* 确保flex容器可以收缩 */
}

/* Chat View - Removed Smart Chat styles, keeping shared message styles */

.message {
  display: flex;
  gap: var(--spacing-md);
  animation: fadeInUp 0.3s ease-out;
}

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

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

.message-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-gradient);
  color: white;
  font-size: 1.125rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-md), var(--shadow-neon);
  border: 2px solid rgba(255, 255, 255, 0.2);
  animation: float 3s ease-in-out infinite;
}

.message.user-message .message-avatar {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 2px solid var(--primary-color);
  animation: float 3s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-5px); }
}

.message-content {
  max-width: 70%;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md), var(--shadow-glass);
  border: 1px solid var(--border-glass);
  position: relative;
  overflow: hidden;
}

.message.user-message .message-content {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-lg), var(--shadow-neon);
  border: none;
}

.message-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
}

.message-author {
  font-weight: 500;
}

.message.user-message .message-author {
  color: rgba(255, 255, 255, 0.9);
}

.message-time {
  color: var(--text-muted);
  font-size: 0.75rem;
}

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

.message-text {
  line-height: 1.6;
  word-wrap: break-word;
}

/* 正在分析消息样式 */
.analyzing-message {
  opacity: 0.8;
}

.analyzing-text {
  color: var(--text-secondary);
  font-style: italic;
}

.analyzing-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary-color);
  font-weight: 500;
}

.analyzing-indicator i {
  color: var(--primary-color);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Chat Input - Removed Smart Chat input container, keeping shared input styles */

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

.file-upload-area {
  border: 2px dashed var(--border-glass);
  border-radius: var(--radius-2xl);
  padding: 30px;
  text-align: center;
  transition: all var(--transition-bounce);
  cursor: pointer;
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm), var(--shadow-glass);
}

.file-upload-area:hover {
  border-color: var(--primary-color);
  background: var(--bg-glass-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), var(--shadow-glass);
}

.file-upload-area.dragover {
  border-color: var(--primary-color);
  background: var(--bg-glass-light);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
  transform: scale(1.02);
}

.upload-area-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 10px;
  font-weight: 600;
  color: var(--text-primary);
}

.upload-area-header i {
  font-size: 1.2em;
  color: var(--primary-color);
}

.upload-area-description {
  color: var(--text-secondary);
  font-size: 0.9em;
  margin-bottom: 15px;
}

.upload-area-btn {
  background: var(--primary-gradient);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: var(--radius-xl);
  cursor: pointer;
  font-size: 0.9em;
  transition: all var(--transition-bounce);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-md), var(--shadow-neon);
  position: relative;
  overflow: hidden;
}

.upload-area-btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
}

.upload-area-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.upload-area-btn:hover::before {
  left: 100%;
}

.uploaded-file-info {
  margin-top: 15px;
}

.file-info-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  background: var(--bg-primary);
  border-radius: 8px;
  font-size: 0.9em;
}

.file-info-item i {
    color: var(--success);
  }

.file-info-item span {
  flex: 1;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.remove-file-btn {
  background: none;
  border: none;
  color: var(--error-color, #ef4444);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.remove-file-btn:hover {
  background: var(--error-color, #ef4444);
  color: white;
}

.input-group {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

/* Removed #messageInput styles - Smart Chat specific */

/* Input Actions - Right side buttons */
.input-actions {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.upload-btn {
  min-width: 44px;
  height: 44px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm), var(--shadow-glass);
  position: relative;
  overflow: hidden;
}

.upload-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  background: var(--bg-glass-light);
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md), var(--shadow-glass);
}

.upload-btn:active {
  transform: translateY(-1px) scale(0.98);
}

.upload-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.2), transparent);
  transition: left 0.5s ease;
}

.upload-btn:hover::before {
  left: 100%;
}

.send-btn {
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-xl);
  padding: var(--spacing-md);
  cursor: pointer;
  transition: all var(--transition-bounce);
  min-width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md), var(--shadow-neon);
  position: relative;
  overflow: hidden;
}

.send-btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
}

.send-btn:active {
  transform: translateY(-1px) scale(0.98);
}

.send-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.send-btn:hover::before {
  left: 100%;
}

/* Analysis View */
.analysis-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-xl);
}

.analysis-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.analysis-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.analysis-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.btn {
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
}

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

.analysis-content {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  overflow-y: auto;
}

/* Files View */
.files-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-xl);
  overflow-y: auto; /* 允许容器滚动 */
  overflow-x: hidden; /* 隐藏横向滚动 */
  min-height: 0; /* 确保flex容器可以收缩 */
  height: 100%; /* 确保占满容器高度 */
}

.files-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-shrink: 0; /* 防止header被压缩 */
}

.files-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

/* Uploaded files grid */
.uploaded-files-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  overflow-y: auto; /* 允许内部滚动 */
  overflow-x: hidden; /* 隐藏横向滚动 */
  flex: 1; /* 占据剩余空间 */
  min-height: 0; /* 允许收缩 */
  padding-right: var(--spacing-xs); /* 为滚动条留空间 */
}

/* 自定义滚动条样式 */
.uploaded-files-grid::-webkit-scrollbar {
  width: 6px;
}

.uploaded-files-grid::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

.uploaded-files-grid::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 3px;
}

.uploaded-files-grid::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Uploaded files section */
.uploaded-files-section {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  height: 320px; /* 固定高度，与上传区域一致 */
}

/* My Datasets section */
.my-datasets-section {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  flex-shrink: 0; /* 防止被压缩 */
}

.my-datasets-section .files-grid {
  max-height: none; /* 不限制高度，让容器滚动 */
}

/* Section headers */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-shrink: 0; /* 防止被压缩 */
}

.section-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-header h3 i {
  color: var(--primary-color);
}

.section-header .btn {
  flex-shrink: 0;
}

/* Empty state styling */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}

.empty-state i {
  font-size: 3rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.empty-state p {
  font-size: 1rem;
  margin: var(--spacing-sm) 0;
}

.empty-state small {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Loading state */
.loading-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}

.loading-state i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

/* Settings View */
.settings-container {
  flex: 1;
  padding: var(--spacing-xl);
  max-width: 800px;
}

.settings-container h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
}

.settings-grid {
  display: grid;
  gap: var(--spacing-xl);
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.setting-item label {
  font-weight: 500;
  color: var(--text-primary);
}

.setting-item select {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
}

.theme-switcher {
  display: flex;
  gap: var(--spacing-sm);
}

.theme-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
}

.theme-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.theme-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-muted);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.empty-state small {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Loading Overlay - Now only for input area */
.loading-overlay {
  display: none; /* Hide full-screen overlay */
}

/* Removed Smart Chat input loading state */

.loading-spinner {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-light);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideIn {
  from { 
    opacity: 0;
    transform: translateY(-30px) scale(0.95);
  }
  to { 
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.loading-spinner p {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Responsive Design */
/* Medium screens (like 13" MacBook) - optimize vertical space */
@media (max-width: 1366px) and (max-height: 900px) {
  .files-container {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .file-management-layout-three {
    grid-template-columns: 1fr 1fr 1.5fr; /* 保持三列布局 */
    gap: var(--spacing-sm);
  }
  
  .upload-area,
  .uploaded-files-section {
    padding: var(--spacing-sm);
    height: 280px; /* 13寸屏幕高度稍小 */
  }
  
  .upload-title {
    font-size: 0.9rem;
    margin-bottom: 4px;
  }
  
  .upload-description {
    font-size: 0.75rem;
    margin-bottom: var(--spacing-sm);
  }
  
  .upload-btn {
    padding: 8px 16px;
    font-size: 0.85rem;
  }
  
  .my-datasets-section {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
  }
  
  .section-header h3 {
    font-size: 0.9rem;
  }
  
  .files-header {
    margin-bottom: var(--spacing-md);
  }
  
  .files-header h2 {
    font-size: 1.25rem;
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -280px;
    height: 100vh;
  }
  
  .sidebar.show {
    left: 0;
  }
  
  .sidebar-toggle {
    display: block;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .top-bar {
    padding: var(--spacing-md);
  }
  
  .project-chat-messages {
    padding: var(--spacing-md);
  }
  
  .message-content {
    max-width: 85%;
  }
  
  .project-chat-input-container {
    padding: var(--spacing-md);
  }
  
  .analysis-container,
  .files-container,
  .settings-container {
    padding: var(--spacing-md);
  }
  
  /* Files view optimizations for small screens */
  .files-container {
    padding: var(--spacing-sm);
  }
  
  .files-header h2 {
    font-size: 1.25rem;
  }
  
  /* Stack three columns vertically on mobile */
  .file-management-layout-three {
    grid-template-columns: 1fr; /* 单列布局 */
    gap: var(--spacing-md);
  }
  
  .upload-area,
  .uploaded-files-section {
    padding: var(--spacing-md);
    height: auto; /* 移动端自动高度 */
    min-height: 250px; /* 最小高度 */
  }
  
  .files-grid {
    grid-template-columns: 1fr;
  }
  
  .my-datasets-section {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }
}

/* Authentication Styles */
.auth-buttons {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: relative;
}

.user-menu {
  position: relative;
  z-index: 10002; /* Ensure menu is above all other elements */
}

.user-menu-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.user-menu-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.user-menu-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 150px;
  z-index: 10003; /* Higher z-index to ensure visibility */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  margin-top: 5px;
}

.user-menu:hover .user-menu-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-menu-dropdown a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.user-menu-dropdown a:hover {
  background: var(--bg-hover);
  color: var(--primary-color);
}

/* Modal Styles */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  animation: fadeIn 0.3s ease;
}

.modal-content {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl), var(--shadow-glass);
  border: 1px solid var(--border-glass);
  max-width: 400px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideIn 0.3s ease;
  position: relative;
}

.modal-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
  opacity: 0.8;
}

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

.modal-header h2 {
  margin: 0;
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  text-align: center;
}

.modal-footer p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.modal-footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.modal-footer a:hover {
  text-decoration: underline;
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.875rem;
}

.form-group input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all var(--transition-fast);
  box-sizing: border-box;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input:invalid {
  border-color: var(--error);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* Verification code styles */
.verification-input-group {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.verification-input-group input {
  flex: 1;
}

.verification-input-group button {
  white-space: nowrap;
  min-width: 100px;
}

.verification-hint {
  display: block;
  margin-top: var(--spacing-xs);
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Countdown button styles */
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Modal transitions and animations */
.modal {
  transition: opacity 0.3s ease;
  opacity: 0;
}

.modal.show {
  opacity: 1;
}

.modal-content {
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform: translateY(-20px);
  opacity: 0;
}

.modal.show .modal-content {
  transform: translateY(0);
  opacity: 1;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateY(-30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Responsive modal styles */
@media (max-width: 480px) {
  .modal-content {
    width: 95%;
    margin: var(--spacing-md);
  }
  
  .verification-input-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .verification-input-group button {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .message {
    gap: var(--spacing-sm);
  }
  
  .message-avatar {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }
  
  .message-content {
    max-width: 90%;
    padding: var(--spacing-sm);
  }
  
  .input-group {
    gap: var(--spacing-xs);
  }
  
  .send-btn {
    min-width: 44px;
    height: 44px;
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 6px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--border-dark);
}

/* Code Block Styling */
.code-block {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  overflow-x: auto;
  margin: var(--spacing-sm) 0;
}

/* Chart Container */
.chart-container {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin: var(--spacing-md) 0;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.chart-container img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

/* Data Display View */
.data-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--spacing-xl);
  background: var(--bg-secondary);
}

.data-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.data-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.data-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.data-filters {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md), var(--shadow-glass);
  border: 1px solid var(--border-glass);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.filter-group label {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.875rem;
}

.filter-group select,
.filter-group input {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-size: 0.875rem;
  min-width: 150px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--shadow-glass);
}

.filter-group select:focus,
.filter-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2), var(--shadow-glass);
  background: var(--bg-glass-light);
  transform: translateY(-1px);
}

/* Data Table Styles */
.data-table-container {
  flex: 1;
  overflow: hidden;
  padding: var(--spacing-md);
}

.data-table-wrapper {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md), var(--shadow-glass);
  border: 1px solid var(--border-glass);
  overflow: hidden;
  height: 100%;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
}

.data-table thead {
  background: var(--bg-tertiary);
  position: sticky;
  top: 0;
  z-index: 10;
}

.data-table th {
  padding: var(--spacing-md) var(--spacing-sm);
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-light);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table td {
  padding: var(--spacing-md) var(--spacing-sm);
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: all var(--transition-smooth);
}

.data-table tbody tr:hover {
  background: var(--bg-hover);
  transform: scale(1.01);
}

.data-table tbody tr.selected {
  background: var(--bg-glass-light);
  border-left: 3px solid var(--primary-color);
}

.data-table .empty-state {
  text-align: center;
  padding: var(--spacing-4xl);
  color: var(--text-muted);
}

.data-table .empty-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.data-table .empty-state p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.data-table .empty-state small {
  font-size: 0.875rem;
}

/* Table Selection */
.table-selection {
  display: flex;
  align-items: center;
  justify-content: center;
}

.dataset-checkbox {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  cursor: pointer;
  transition: all var(--transition-smooth);
  position: relative;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

.dataset-checkbox:hover {
  border-color: var(--primary-color);
  transform: scale(1.1);
}

.dataset-checkbox:checked {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.dataset-checkbox:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.dataset-checkbox:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* Download Links */
.download-link {
  color: var(--success);
  text-decoration: none;
  font-size: 0.875rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.1);
  transition: all var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.download-link:hover {
  background: var(--success);
  color: white;
  transform: translateY(-1px);
}

.download-link i {
  font-size: 0.75rem;
}

/* Add to Chat Button States */
.btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn.disabled:hover {
  transform: none;
  box-shadow: var(--shadow-md);
}

/* Responsive Table */
@media (max-width: 768px) {
  .data-table-container {
    padding: var(--spacing-sm);
  }
  
  .data-table th,
  .data-table td {
    padding: var(--spacing-sm) var(--spacing-xs);
    font-size: 0.75rem;
  }
  
  .data-table th:nth-child(2),
  .data-table td:nth-child(2),
  .data-table th:nth-child(4),
  .data-table td:nth-child(4) {
    display: none;
  }
}

.data-card {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md), var(--shadow-glass);
  transition: all var(--transition-bounce);
  cursor: pointer;
  border: 1px solid var(--border-glass);
  position: relative;
  overflow: hidden;
}

.data-card:hover {
  box-shadow: var(--shadow-lg), var(--shadow-neon);
  transform: translateY(-5px) scale(1.02);
  border-color: var(--primary-color);
}

.data-card.selected {
  border-color: var(--primary-color);
  background: var(--bg-glass-light);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
  transform: translateY(-3px);
}

.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.data-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.data-card-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.data-card-type {
  font-size: 0.75rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.data-card-info {
  margin-bottom: var(--spacing-md);
}

.data-card-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.data-card-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.data-card-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

.data-card-actions button {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.data-card-actions button:hover {
  background: var(--primary-color);
  color: var(--text-white);
  border-color: var(--primary-color);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.hidden { display: none !important; }
.visible { display: block !important; }

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Projects Section Styles */
.projects-section {
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  padding-top: var(--spacing-md);
}

.projects-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--text-white);
  font-weight: 600;
  font-size: 0.9rem;
}

.projects-header i {
  margin-right: var(--spacing-sm);
  color: var(--primary-light);
}

.add-project-btn {
  background: none;
  border: none;
  color: var(--text-white);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.add-project-btn:hover {
  background: var(--primary-color);
  color: var(--text-white);
}

.projects-list {
  max-height: 200px;
  overflow-y: auto;
}

.empty-projects {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-muted);
}

.empty-projects i {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-muted);
}

.empty-projects p {
  margin: var(--spacing-sm) 0;
  font-weight: 500;
}

.empty-projects small {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.project-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  margin: var(--spacing-xs) 0;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-white);
  text-decoration: none;
}

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

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

.project-item-icon {
  margin-right: var(--spacing-sm);
  color: var(--primary-light);
}

.project-item-info {
  flex: 1;
  min-width: 0;
}

.project-item-name {
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.project-item-datasets {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.project-item-actions {
  display: flex;
  gap: var(--spacing-xs);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.project-item:hover .project-item-actions {
  opacity: 1;
}

.project-item-action {
  background: none;
  border: none;
  color: var(--text-white);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.project-item-action:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Home View Styles */
.home-container {
  padding: 0;
  height: 100%;
  overflow-y: auto;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
}

/* Hero Section */
.hero-section {
  padding: 4rem 2rem;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
  color: white;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  z-index: 1; /* Keep behind header (z-index: 10002+) */
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.3;
  z-index: 1; /* Keep behind header elements */
  pointer-events: none; /* Allow clicks to pass through */
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 0.8s ease-out;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(45deg, #fff, #e0e7ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  opacity: 0.9;
}

.hero-description {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 2.5rem;
  opacity: 0.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

.hero-actions .btn {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-actions .btn-primary {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: white;
  backdrop-filter: blur(10px);
}

.hero-actions .btn-primary:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.hero-actions .btn-outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: white;
}

.hero-actions .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
}

.hero-visual {
  animation: fadeInRight 0.8s ease-out 0.2s both;
}

.feature-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.feature-card i {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: #e0e7ff;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: white;
}

.feature-card p {
  font-size: 0.9rem;
  opacity: 0.8;
  line-height: 1.5;
}

/* Features Section */
.features-section {
  padding: 5rem 2rem;
  background: var(--bg-primary);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-header p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.feature-item:hover::before {
  transform: scaleX(1);
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.feature-icon i {
  font-size: 1.5rem;
  color: white;
}

.feature-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-item p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Technology Section */
.tech-section {
  padding: 5rem 2rem;
  background: var(--bg-secondary);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.tech-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.tech-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.tech-item i {
  font-size: 2.5rem;
  color: var(--primary-color);
}

.tech-item span {
  font-weight: 600;
  color: var(--text-primary);
}

/* Getting Started Section */
.getting-started-section {
  padding: 5rem 2rem;
  background: var(--bg-primary);
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  max-width: 1000px;
  margin: 0 auto;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
}

.step-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.step-number {
  width: 50px;
  height: 50px;
  background: var(--primary-gradient);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.step-content p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* CTA Section */
.cta-section {
  text-align: center;
  margin-top: 4rem;
  padding: 3rem 2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
}

.cta-section h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.cta-section p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-buttons .btn {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
}

.cta-buttons .btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-md);
}

.cta-buttons .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.cta-buttons .btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.cta-buttons .btn-outline:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .steps-container {
    grid-template-columns: 1fr;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-buttons .btn {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: 2rem 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .features-section,
  .getting-started-section {
    padding: 3rem 1rem;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
  
  .feature-cards {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .feature-card {
    padding: 1.5rem;
  }
}

/* Project View Styles */
.project-container {
  height: 100%;
  display: flex;
  flex-direction: column;
  min-height: 0; /* 确保flex容器可以收缩 */
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-primary);
  flex-shrink: 0; /* 防止头部被压缩 */
}

.project-info h2 {
  margin: 0;
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
}

.project-info p {
  margin: var(--spacing-xs) 0 0 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.project-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.project-chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0; /* 确保flex子元素可以收缩 */
}

/* Download section styles */
.download-section {
  background: #e8f4fd;
  border: 1px solid #b3d9ff;
  border-radius: 8px;
  padding: 16px;
  margin: 12px 0;
}

.download-section h4 {
  margin: 0 0 8px 0;
  color: #0066cc;
  font-size: 14px;
  font-weight: 600;
}

.download-section p {
  margin: 0 0 12px 0;
  color: #666;
  font-size: 13px;
  line-height: 1.4;
}

.download-csv-btn {
  background: #0066cc;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: background-color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.download-csv-btn:hover {
  background: #0052a3;
}

.download-csv-btn i {
  font-size: 12px;
}

.project-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  min-height: 0; /* 确保可以滚动 */
}

.project-chat-input-container {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-glass);
  padding: var(--spacing-sm);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  flex-shrink: 0; /* 防止输入框被压缩 */
}

/* Ensure Project messages use the same styles as main chat */
.project-chat-messages .message {
  display: flex;
  gap: var(--spacing-md);
  animation: fadeInUp 0.3s ease-out;
}

.project-chat-messages .message-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.project-chat-messages .user-message .message-avatar {
  background: var(--primary-color);
  color: white;
}

.project-chat-messages .ai-message .message-avatar {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.project-chat-messages .message-content {
  flex: 1;
  min-width: 0;
}

.project-chat-messages .message-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.project-chat-messages .message-author {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.project-chat-messages .message-time {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.project-chat-messages .message-text {
  color: var(--text-primary);
  line-height: 1.5;
  word-wrap: break-word;
  max-width: 100%;
  overflow-wrap: break-word;
}

.project-chat-messages .user-message {
  flex-direction: row-reverse;
}

.project-chat-messages .user-message .message-content {
  text-align: right;
}

.project-chat-messages .user-message .message-text {
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-sm);
  display: inline-block;
  max-width: 100%;
  overflow-wrap: break-word;
}

.project-chat-messages .ai-message .message-text {
  background: var(--bg-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  max-width: 100%;
  overflow-wrap: break-word;
}

/* Tip Message Styles */
.tip-message {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-left: 4px solid #f59e0b;
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.15);
  color: #78350f;
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-line;
  position: relative;
}

.tip-message::before {
  content: '💡';
  font-size: 1.5rem;
  position: absolute;
  left: 12px;
  top: 12px;
}

.tip-message strong {
  color: #92400e;
  font-weight: 600;
  display: block;
  margin-bottom: var(--spacing-xs);
  padding-left: 32px;
}

.tip-message p {
  margin: var(--spacing-xs) 0;
  padding-left: 32px;
}

/* 处理列表样式 */
.tip-message ul {
  margin: var(--spacing-xs) 0;
  padding-left: 48px;
  list-style: none;
}

.tip-message li {
  margin: var(--spacing-xs) 0;
  color: #78350f;
  position: relative;
  padding-left: 8px;
}

.tip-message li::before {
  content: '•';
  color: #f59e0b;
  font-weight: bold;
  position: absolute;
  left: -12px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .tip-message {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
  }
  
  .tip-message::before {
    font-size: 1.2rem;
    left: 8px;
    top: 8px;
  }
  
  .tip-message strong,
  .tip-message p {
    padding-left: 28px;
  }
  
  .tip-message ul {
    padding-left: 40px;
  }
}

/* Project Message Input Styles */
#projectMessageInput {
  flex: 1;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-2xl);  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: 0.95rem;
  resize: none;
  min-height: 40px;
  max-height: 100px;
  transition: all var(--transition-normal);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm), var(--shadow-glass);
}

#projectMessageInput:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2), var(--shadow-glass);
  background: var(--bg-glass-light);
  transform: translateY(-2px);
}

#projectMessageInput::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

/* Project Creation Modal */
.project-creation-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.project-creation-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-xl);
}

.project-creation-header {
  margin-bottom: var(--spacing-lg);
}

.project-creation-header h3 {
  margin: 0;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
}

.project-creation-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  transition: all var(--transition-normal);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2), var(--shadow-glass);
  background: var(--bg-glass-light);
  transform: translateY(-1px);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.project-datasets-preview {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  max-height: 200px;
  overflow-y: auto;
}

.dataset-preview-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm);
  margin: var(--spacing-xs) 0;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.dataset-preview-item i {
  margin-right: var(--spacing-sm);
  color: var(--primary-color);
}

.dataset-preview-info {
  flex: 1;
}

.dataset-preview-name {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.dataset-preview-details {
  display: flex;
  gap: var(--spacing-sm);
  margin: var(--spacing-xs) 0;
}

.dataset-preview-details span {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.dataset-preview-files {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
}

.file-badge {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.file-badge.gse {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary-color);
}

.file-badge.clinical {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

/* EDA Results Styles */
.eda-loading {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary-color);
  font-style: italic;
  padding: var(--spacing-sm);
  background: rgba(99, 102, 241, 0.05);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary-color);
}

.eda-results {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-md) 0;
  border: 1px solid var(--border-light);
}

.eda-results h4 {
  color: var(--text-primary);
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.eda-results h5 {
  color: var(--text-secondary);
  margin: var(--spacing-md) 0 var(--spacing-xs) 0;
  font-size: 1rem;
  font-weight: 500;
}

.eda-results ul {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
}

.eda-results li {
  margin: var(--spacing-xs) 0;
  color: var(--text-primary);
}

.eda-results li strong {
  color: var(--text-primary);
  font-weight: 600;
}

.eda-results p {
  color: var(--text-secondary);
  margin: var(--spacing-sm) 0;
  font-size: 0.9rem;
}

.eda-results em {
  color: var(--primary-color);
  font-style: italic;
  font-weight: 500;
}

.project-creation-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
}

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-bounce);
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--primary-gradient);
  color: var(--text-white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-glass-light);
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-danger {
  background: linear-gradient(135deg, var(--error) 0%, #dc2626 100%);
  color: var(--text-white);
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Summary Card Styles */
.summary-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.summary-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.summary-card h4 {
  color: var(--text-primary);
  margin: 0 0 var(--spacing-md) 0;
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.summary-card p {
  color: var(--text-secondary);
  margin: var(--spacing-xs) 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.summary-card strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Dark theme specific adjustments */
[data-theme="dark"] .summary-card {
  background: var(--bg-glass-dark);
  border-color: var(--border-glass);
}

[data-theme="dark"] .summary-card h4 {
  color: var(--text-primary);
}

[data-theme="dark"] .summary-card p {
  color: var(--text-secondary);
}

[data-theme="dark"] .summary-card strong {
  color: var(--text-primary);
}
/* U
pload Progress Bar Animations */
@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

/* Upload Progress Container Styles */
.upload-progress-container {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.upload-progress-container .progress-bar-fill {
    animation: progressPulse 1.5s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

.upload-progress-container .progress-status-icon {
    animation: iconBounce 0.5s ease-in-out;
}

@keyframes iconBounce {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* Error Modal Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Error Modal Styles */
.upload-error-modal button:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    transition: all 0.2s ease;
}

.upload-error-modal button:active {
    transform: translateY(0);
}

/* ========================================
   Stratification Analysis Styles
   ======================================== */

.stratification-plot-card {
    margin: 15px 0;
    max-width: 100%;
    overflow-x: auto;  /* Allow horizontal scroll if needed */
    overflow-y: visible;
}

.stratification-plotly {
    min-height: 500px;
    width: 100%;
    max-width: 100%;
}

.stratification-plotly .plotly-graph-div {
    max-width: 100% !important;
    overflow: visible;
}

/* Stratification modal overlay */
#stratification-modal-overlay,
#stratification-var-modal-overlay {
    z-index: 10000;
    backdrop-filter: blur(5px);
}

/* Variable selection hover effects */
.var-option {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.var-option:hover {
    cursor: pointer;
}

/* Stratification button in quick actions */
.quick-action-btn {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.quick-action-btn:active {
    transform: translateY(0) !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2) !important;
}

/* Interactive plot container */
.message-plots {
    margin-top: 15px;
    overflow: visible !important;
}

/* Inline stratification plot placeholder (inserted in message text) */
.stratification-plot-inline {
    margin: 20px 0;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: visible;
}

.plot-card {
    overflow: visible !important;
}

/* Plotly modebar styling */
.modebar {
    right: 10px !important;
    top: 10px !important;
}

.modebar-btn {
    transition: all 0.2s ease !important;
}

.modebar-btn:hover {
    background: rgba(79, 172, 254, 0.1) !important;
}

/* Responsive adjustments for stratification plots */
@media (max-width: 1200px) {
    .stratification-plotly {
        min-height: 400px;
    }
}

@media (max-width: 768px) {
    .stratification-plotly {
        min-height: 350px;
    }
    
    .var-option {
        padding: 12px !important;
    }
}