/* =====================================================
   Lonely Researcher - Modern UI Stylesheet
   Based on professional UI design system
   ===================================================== */

/* Import Inter font from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;900&display=swap');

/* =====================================================
   1. ROOT VARIABLES & BASE STYLES
   ===================================================== */

:root {
  --color-primary: #0d141c;
  --color-secondary: #49709c;
  --color-accent: #0d78f2;
  --color-background: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e7edf4;
  --color-border-strong: #cedae8;
  --color-muted: #e7edf4;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --border-radius: 0.5rem;
  --border-radius-lg: 0.75rem;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

/* =====================================================
   2. LAYOUT & STRUCTURE
   ===================================================== */

.container-fluid {
  background-color: var(--color-background);
}

/* Sidebar Navigation */
.sidebar {
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  min-height: 100vh;
  padding: 1.5rem 1rem;
}

.content-area {
  background-color: var(--color-background);
  min-height: 100vh;
  padding: 0;
}

/* Header styling */
.border-bottom {
  border-bottom: 1px solid var(--color-border) !important;
}

/* =====================================================
   3. USER INTERFACE COMPONENTS
   ===================================================== */

/* User Info Box */
.user-info {
  background: linear-gradient(135deg, var(--color-accent), #1e40af);
  color: white;
  border-radius: var(--border-radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
}

.logout-btn {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
}

.logout-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  color: white;
  transform: translateY(-1px);
}

/* =====================================================
   4. CARDS & CONTENT CONTAINERS
   ===================================================== */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.card-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
  font-weight: 600;
  color: var(--color-primary);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.5rem;
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* Paper Cards */
.paper-card {
  transition: all 0.2s ease;
  border: 1px solid var(--color-border);
}

.paper-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

/* Project Cards */
.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  transition: all 0.2s ease;
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

/* =====================================================
   5. BUTTONS & FORM ELEMENTS
   ===================================================== */

.btn {
  border-radius: var(--border-radius);
  font-weight: 500;
  font-size: 0.875rem;
  line-height: 1.5;
  padding: 0.5rem 1rem;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: #0c70e0;
  border-color: #0c70e0;
  color: white;
}

.btn-outline-primary {
  background-color: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

.btn-secondary {
  background-color: var(--color-muted);
  border-color: var(--color-border);
  color: var(--color-primary);
}

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

.btn-outline-secondary {
  background-color: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-secondary);
}

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

.btn-success {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: white;
}

.btn-outline-success {
  background-color: transparent;
  border-color: var(--color-success);
  color: var(--color-success);
}

.btn-danger {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: white;
}

.btn-outline-danger {
  background-color: transparent;
  border-color: var(--color-error);
  color: var(--color-error);
}

.btn-warning {
  background-color: var(--color-warning);
  border-color: var(--color-warning);
  color: white;
}

.btn-outline-warning {
  background-color: transparent;
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.btn-info {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.btn-outline-info {
  background-color: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Form Controls */
.form-control,
.form-select {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-primary);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(13, 120, 242, 0.1);
}

.form-label {
  color: var(--color-primary);
  font-weight: 500;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.form-text {
  color: var(--color-secondary);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

/* =====================================================
   6. AUTHENTICATION PAGES
   ===================================================== */

.auth-body {
  background: linear-gradient(135deg, var(--color-accent) 0%, #1e40af 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 2rem 0;
}

.login-card,
.register-card {
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-width: 400px;
  margin: 0 auto;
}

.register-card {
  max-width: 450px;
}

.login-header,
.register-header {
  background: linear-gradient(135deg, var(--color-accent) 0%, #1e40af 100%);
  color: white;
  text-align: center;
  padding: 2.5rem 2rem;
}

.login-header h3,
.login-header p,
.register-header h3,
.register-header p {
  color: white !important;
}

.login-body,
.register-body {
  padding: 2rem;
}

.btn-login,
.btn-register {
  background: linear-gradient(135deg, var(--color-accent) 0%, #1e40af 100%);
  border: none;
  border-radius: var(--border-radius-lg);
  padding: 0.875rem 1.5rem;
  font-weight: 500;
  color: white;
  width: 100%;
}

.btn-login:hover,
.btn-register:hover {
  background: linear-gradient(135deg, #0c70e0 0%, #1d4ed8 100%);
  transform: translateY(-1px);
  color: white;
}

.auth-form-control {
  border-radius: var(--border-radius-lg);
  padding: 0.875rem 1.25rem;
  border: 2px solid var(--color-border);
  background-color: var(--color-surface);
}

.auth-form-control:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(13, 120, 242, 0.15);
}

.register-link,
.login-link {
  color: var(--color-accent);
  font-weight: 500;
  text-decoration: none;
}

.register-link:hover,
.login-link:hover {
  color: #0c70e0;
  text-decoration: underline;
}

/* =====================================================
   7. NAVIGATION & SIDEBAR
   ===================================================== */

.nav-link {
  color: var(--color-secondary);
  border-radius: var(--border-radius);
  padding: 0.75rem 1rem;
  margin: 0.25rem 0;
  transition: all 0.2s ease;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 500;
}

.nav-link:hover {
  background-color: var(--color-muted);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--color-accent);
  color: white;
}

/* =====================================================
   8. ALERTS & NOTIFICATIONS
   ===================================================== */

.alert {
  border: none;
  border-radius: var(--border-radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.alert-success {
  background-color: #dcfce7;
  color: #166534;
  border-left: 4px solid var(--color-success);
}

.alert-danger {
  background-color: #fef2f2;
  color: #dc2626;
  border-left: 4px solid var(--color-error);
}

.alert-warning {
  background-color: #fffbeb;
  color: #d97706;
  border-left: 4px solid var(--color-warning);
}

.alert-info {
  background-color: #eff6ff;
  color: #2563eb;
  border-left: 4px solid var(--color-accent);
}

/* =====================================================
   9. PROGRESS & LOADING COMPONENTS
   ===================================================== */

/* Enhanced Progress Bars */
.progress {
  background-color: var(--color-muted);
  border-radius: var(--border-radius);
  height: 0.625rem;
  overflow: hidden;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar {
  background: linear-gradient(135deg, var(--color-accent) 0%, #1e40af 100%);
  border-radius: var(--border-radius);
  transition: width 0.6s ease-in-out;
  position: relative;
  overflow: hidden;
}

.progress-bar.bg-success {
  background: linear-gradient(135deg, var(--color-success) 0%, #059669 100%);
}

.progress-bar.bg-danger {
  background: linear-gradient(135deg, var(--color-error) 0%, #dc2626 100%);
}

.progress-bar.bg-warning {
  background: linear-gradient(135deg, var(--color-warning) 0%, #d97706 100%);
}

/* Animated Progress Bar */
.progress-bar-animated {
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-size: 1rem 1rem;
  animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
  0% {
    background-position: 1rem 0;
  }
  100% {
    background-position: 0 0;
  }
}

/* Import Progress Specific Styles */
#import-progress {
  margin: 1.5rem 0;
}

#import-progress .alert {
  border-left: 4px solid var(--color-accent);
  background: linear-gradient(135deg, #eff6ff 0%, #f0f9ff 100%);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

#import-progress .alert h6 {
  margin-bottom: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#progress-icon {
  font-size: 1.1rem;
}

#progress-text {
  color: var(--color-secondary);
  font-weight: 500;
}

#progress-details {
  color: var(--color-secondary);
  font-size: 0.8rem;
  opacity: 0.8;
}

/* Smooth progress bar for imports */
#import-progress .progress-bar {
  transition: width 0.8s ease-out;
  background: linear-gradient(135deg, var(--color-accent) 0%, #1e40af 100%);
}

#import-progress .progress-bar:not(.bg-success):not(.bg-danger) {
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.1) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.1) 75%,
    transparent 75%,
    transparent
  );
  background-size: 1rem 1rem;
  animation: progress-bar-stripes 2s linear infinite;
}

/* Step Progress Indicator */
.step-progress {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.step-progress .step {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-muted);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.step-progress .step.active {
  background-color: var(--color-accent);
  color: white;
  box-shadow: 0 0 0 3px rgba(13, 120, 242, 0.2);
}

.step-progress .step.completed {
  background-color: var(--color-success);
  color: white;
}

.step-progress .separator {
  flex: 1;
  height: 2px;
  background-color: var(--color-muted);
  margin: 0 0.25rem;
}

.step-progress .separator.completed {
  background-color: var(--color-success);
}

/* Loading States */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(2px);
}

.loading-spinner {
  width: 3rem;
  height: 3rem;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Pulse Animation for Loading */
.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

/* =====================================================
   10. CHAT INTERFACE
   ===================================================== */

/* Legacy chat styles - kept for compatibility */
#chat-messages.border.rounded {
  height: 400px;
  overflow-y: auto;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1rem;
}

/* Chat message styling */
.bg-primary {
  background-color: var(--color-accent) !important;
}

.bg-light {
  background-color: var(--color-muted) !important;
}

.text-light {
  color: rgba(255, 255, 255, 0.8) !important;
}

.text-muted {
  color: var(--color-secondary) !important;
}

/* AI Response Content */
.ai-response-content {
  line-height: 1.6;
  color: var(--color-primary);
}

.ai-response-content h1,
.ai-response-content h2,
.ai-response-content h3,
.ai-response-content h4,
.ai-response-content h5,
.ai-response-content h6 {
  margin-top: 1em;
  margin-bottom: 0.5em;
  color: var(--color-primary);
}

.ai-response-content pre {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1rem;
  overflow-x: auto;
  margin: 1em 0;
}

.ai-response-content code {
  background-color: var(--color-muted);
  padding: 0.2em 0.4em;
  border-radius: 0.25rem;
  font-size: 0.9em;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

.ai-response-content blockquote {
  border-left: 4px solid var(--color-border-strong);
  margin: 1em 0;
  padding-left: 1em;
  color: var(--color-secondary);
}

.ai-response-content a {
  color: var(--color-accent);
  text-decoration: none;
}

.ai-response-content a:hover {
  text-decoration: underline;
}

/* Suggested Questions (Legacy) */
.suggested-question:not(.suggested-btn) {
  background-color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-primary);
  text-align: left !important;
  white-space: normal !important;
  transition: all 0.2s ease;
}

.suggested-question:not(.suggested-btn):hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* =====================================================
   11. SETTINGS PAGE
   ===================================================== */

.settings-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.settings-section {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.section-header {
  background: var(--color-background);
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
}

.section-body {
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.prompt-textarea {
  min-height: 120px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 13px;
  resize: vertical;
}

.btn-reset {
  margin-left: 0.75rem;
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  background-color: var(--color-muted);
  border-color: var(--color-border);
  color: var(--color-secondary);
}

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

.temperature-input {
  max-width: 100px;
}

.model-temp-row {
  display: flex;
  gap: 1rem;
  align-items: end;
}

.model-temp-row .form-group {
  margin-bottom: 0;
  flex: 1;
}

.model-temp-row .temp-group {
  flex: 0 0 120px;
}

.sticky-save {
  position: sticky;
  bottom: 1.5rem;
  background: var(--color-surface);
  padding: 1.25rem;
  border-top: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin: 1.5rem -1.5rem -1.5rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

/* =====================================================
   12. UTILITY CLASSES & COMPONENTS
   ===================================================== */

/* Relevance Scores */
.relevance-score {
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius);
  font-size: 0.75rem;
}

.score-high {
  background-color: #dcfce7;
  color: #166534;
}

.score-medium {
  background-color: #fef3c7;
  color: #d97706;
}

.score-low {
  background-color: #fef2f2;
  color: #dc2626;
}

/* Question Items */
.question-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: all 0.2s ease;
}

.question-item:hover {
  background-color: var(--color-background);
  border-color: var(--color-border-strong);
}

/* Badges */
.badge {
  border-radius: var(--border-radius);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.5rem;
}

.bg-secondary {
  background-color: var(--color-secondary) !important;
}

.bg-success {
  background-color: var(--color-success) !important;
}

.bg-warning {
  background-color: var(--color-warning) !important;
}

.bg-danger {
  background-color: var(--color-error) !important;
}

.bg-info {
  background-color: var(--color-accent) !important;
}

/* File upload styling */
#file-list {
  margin-top: 1rem;
}

#upload-progress {
  margin-top: 1.5rem;
}

/* File Analysis Preview */
#file-analysis {
  margin-top: 1rem;
}

#file-analysis .alert {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
}

#analysis-content {
  margin-top: 0.75rem;
}

#analysis-content h6 {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

#analysis-content small {
  color: var(--color-secondary);
  font-weight: 500;
}

/* =====================================================
   13. TYPOGRAPHY IMPROVEMENTS
   ===================================================== */

h1, .h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

h2, .h2 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

h3, .h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

h4, .h4 {
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

h5, .h5 {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

h6, .h6 {
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

p {
  line-height: 1.6;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.text-primary {
  color: var(--color-primary) !important;
}

.text-secondary {
  color: var(--color-secondary) !important;
}

/* =====================================================
   14. RESPONSIVE DESIGN
   ===================================================== */

@media (max-width: 768px) {
  .sidebar {
    position: static;
    min-height: auto;
    margin-bottom: 1rem;
    padding: 1rem;
  }
  
  .content-area {
    margin-left: 0 !important;
  }
  
  .model-temp-row {
    flex-direction: column;
    gap: 1rem;
  }
  
  .model-temp-row .temp-group {
    flex: 1;
    max-width: 100%;
  }
  
  .temperature-input {
    max-width: 100%;
  }
  
  .settings-container {
    padding: 1rem;
  }
  
  .sticky-save {
    position: relative;
    bottom: auto;
  }
  
  .card-body {
    padding: 1rem;
  }
  
  .user-info {
    margin-bottom: 1rem;
    padding: 1rem;
  }

  /* Progress components responsive */
  #import-progress {
    margin: 1rem 0;
  }

  #import-progress .alert {
    padding: 1rem;
  }

  .step-progress {
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .step-progress .step {
    width: 20px;
    height: 20px;
    font-size: 0.6rem;
  }
}

@media (max-width: 576px) {
  .login-card,
  .register-card {
    margin: 0 1rem;
  }
  
  .auth-body {
    padding: 1rem;
  }
  
  #chat-messages.border.rounded {
    height: 300px;
  }
  
  .login-header,
  .register-header {
    padding: 2rem 1.5rem;
  }
  
  .login-body,
  .register-body {
    padding: 1.5rem;
  }

  /* Small screen progress adjustments */
  #progress-text {
    font-size: 0.8rem;
  }

  #progress-details {
    font-size: 0.7rem;
  }
}

/* =====================================================
   15. ANIMATIONS & TRANSITIONS
   ===================================================== */

/* Smooth transitions for interactive elements */
.btn,
.card,
.form-control,
.form-select,
.nav-link {
  transition: all 0.2s ease;
}

/* Loading spinner animation */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.fa-spinner {
  animation: spin 1s linear infinite;
}

/* Progress bar animation */
.progress-bar-animated {
  animation: progress-bar-stripes 1s linear infinite;
}

/* Fade in animation for progress components */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#import-progress {
  animation: fadeIn 0.3s ease;
}

/* Success animation */
@keyframes checkmark {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.success-checkmark {
  animation: checkmark 0.5s ease;
}

/* Hover effects */
.card:hover,
.paper-card:hover,
.project-card:hover {
  transform: translateY(-2px);
}

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

/* =====================================================
   16. SCROLLBAR STYLING
   ===================================================== */

/* General scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-background);
  border-radius: var(--border-radius);
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--color-secondary);
}

/* Legacy chat scrollbar (for old pages) */
#chat-messages.border.rounded::-webkit-scrollbar {
  width: 8px;
}

#chat-messages.border.rounded::-webkit-scrollbar-track {
  background: var(--color-background);
  border-radius: var(--border-radius);
}

#chat-messages.border.rounded::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--border-radius);
}

#chat-messages.border.rounded::-webkit-scrollbar-thumb:hover {
  background: var(--color-secondary);
}

/* =====================================================
   17. PRINT STYLES
   ===================================================== */

@media print {
  .sidebar,
  .btn-toolbar,
  .sticky-save,
  .logout-btn,
  #import-progress {
    display: none !important;
  }
  
  .content-area {
    margin: 0 !important;
    padding: 0 !important;
  }
  
  .card {
    border: 1px solid #000 !important;
    page-break-inside: avoid;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
}

/* =====================================================
   18. ACCORDION & COLLAPSIBLE CONTENT
   ===================================================== */

.accordion-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: 0.5rem;
}

.accordion-button {
  background-color: var(--color-surface);
  color: var(--color-primary);
  border: none;
  padding: 1rem 1.25rem;
  font-weight: 500;
}

.accordion-button:focus {
  box-shadow: 0 0 0 3px rgba(13, 120, 242, 0.1);
  border-color: var(--color-accent);
}

.accordion-button:not(.collapsed) {
  background-color: var(--color-muted);
  color: var(--color-primary);
}

.accordion-body {
  padding: 1rem 1.25rem;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

/* =====================================================
   19. TABLES
   ===================================================== */

.table {
  background-color: var(--color-surface);
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table th {
  background-color: var(--color-background);
  color: var(--color-primary);
  font-weight: 600;
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.table td {
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-primary);
}

.table tbody tr:hover {
  background-color: var(--color-background);
}

/* =====================================================
   20. CUSTOM COMPONENTS
   ===================================================== */

/* Stats Cards */
.stats-card {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-background) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

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

.stats-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.stats-label {
  font-size: 0.875rem;
  color: var(--color-secondary);
  font-weight: 500;
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--color-secondary);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h4 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

/* Real-time Status Indicators */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-lg);
  font-size: 0.8rem;
  font-weight: 500;
}

.status-indicator.processing {
  background-color: #eff6ff;
  color: #2563eb;
  border: 1px solid #bfdbfe;
}

.status-indicator.success {
  background-color: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.status-indicator.error {
  background-color: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.status-indicator .icon {
  font-size: 0.9em;
}

/* Connection Status */
.connection-status {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-lg);
  font-size: 0.8rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  display: none;
}

.connection-status.connected {
  background-color: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.connection-status.disconnected {
  background-color: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

/* Import specific progress enhancements */
.import-step-indicator {
  display: flex;
  justify-content: space-between;
  margin: 1rem 0;
  padding: 1rem;
  background: var(--color-background);
  border-radius: var(--border-radius);
}

.import-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  position: relative;
}

.import-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 12px;
  right: -50%;
  width: 100%;
  height: 2px;
  background-color: var(--color-muted);
  z-index: 1;
}

.import-step.completed:not(:last-child)::after {
  background-color: var(--color-success);
}

.import-step-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-muted);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  z-index: 2;
  position: relative;
}

.import-step.active .import-step-icon {
  background-color: var(--color-accent);
  color: white;
  animation: pulse 2s infinite;
}

.import-step.completed .import-step-icon {
  background-color: var(--color-success);
  color: white;
}

.import-step-label {
  font-size: 0.7rem;
  color: var(--color-secondary);
  font-weight: 500;
}

.import-step.active .import-step-label,
.import-step.completed .import-step-label {
  color: var(--color-primary);
  font-weight: 600;
}

/* =====================================================
   21. EXPORT SELECTION INTERFACE STYLES
   ===================================================== */

/* Export Selection Interface Styles */
.export-container {
    padding: 1rem 0;
}

.papers-container {
    max-height: 500px;
    overflow-y: auto;
    border: 1px solid #e5e5e7;
    border-radius: 8px;
    padding: 0.5rem;
}

.papers-container::-webkit-scrollbar {
    width: 8px;
}

.papers-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

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

.papers-container::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* Paper selection cards */
.paper-selection-card {
    transition: all 0.2s ease;
    border: 1px solid #e9ecef;
}

.paper-selection-card:hover {
    border-color: #007bff;
    box-shadow: 0 2px 4px rgba(0, 123, 255, 0.1);
}

.paper-selection-card .form-check-input:checked ~ .form-check-label {
    color: #007bff;
}

/* Field selection styling */
.field-selection-card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
}

.field-checkbox:checked ~ .form-check-label {
    font-weight: 500;
    color: #007bff;
}

/* Export summary section */
.export-summary {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1rem;
}

.export-summary h6 {
    color: #495057;
    margin-bottom: 0.75rem;
}

.export-summary .row > div {
    text-align: center;
    padding: 0.5rem;
}

.export-summary strong {
    color: #007bff;
    font-size: 1.25rem;
}

/* Progress styling */
#export-progress {
    border: 1px solid #007bff;
    border-radius: 8px;
    background: #f8f9fa;
}

#export-progress .alert {
    margin: 0;
    border: none;
    background: transparent;
}

#export-progress .progress {
    height: 8px;
    background: #e9ecef;
}

#export-progress .progress-bar {
    background: linear-gradient(90deg, #007bff, #0056b3);
}

/* Button states */
.btn-export {
    min-width: 200px;
    font-weight: 500;
}

.btn-export:disabled {
    background-color: #6c757d;
    border-color: #6c757d;
    color: #fff;
}

/* Quick action buttons */
.quick-action-btn {
    border-radius: 6px;
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.quick-action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Master checkbox styling */
.master-checkbox {
    font-size: 1.1rem;
}

.master-checkbox .form-check-input {
    transform: scale(1.2);
    margin-right: 0.75rem;
}

/* Field categories */
.field-category {
    border-bottom: 1px solid #e9ecef;
    padding-bottom: 0.5rem;
    margin-bottom: 0.75rem;
}

.field-category:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.field-category h6 {
    color: #495057;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Additional options card */
.additional-options {
    background: #fff;
    border: 1px solid #e9ecef;
    border-radius: 8px;
}

.additional-options .card-header {
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    padding: 0.75rem 1rem;
}

.additional-options .card-body {
    padding: 1rem;
}

/* Instructions section */
.instructions-card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
}

.instructions-card .card-header {
    background: #e9ecef;
    font-weight: 600;
}

.instructions-card ul {
    margin-bottom: 0;
}

.instructions-card li {
    padding: 0.25rem 0;
}

.instructions-card i {
    width: 20px;
    text-align: center;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .papers-container {
        max-height: 300px;
    }
    
    .export-summary .row > div {
        margin-bottom: 0.5rem;
    }
    
    .col-md-7, .col-md-5 {
        margin-bottom: 1rem;
    }
    
    .quick-action-btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}

/* Animation for success state */
@keyframes exportSuccess {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.export-success {
    animation: exportSuccess 0.5s ease-in-out;
}

/* Loading state for form elements */
.loading .form-check-input,
.loading .btn {
    pointer-events: none;
    opacity: 0.6;
}

/* Custom alert styling for export */
.alert-export-info {
    background: #e3f2fd;
    border: 1px solid #90caf9;
    color: #1565c0;
}

.alert-export-warning {
    background: #fff3e0;
    border: 1px solid #ffcc02;
    color: #f57c00;
}

/* Checkbox indeterminate state styling */
.form-check-input:indeterminate {
    background-color: #007bff;
    border-color: #007bff;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10h8'/%3e%3c/svg%3e");
}

/* Paper count badges */
.paper-count-badge {
    background: #007bff;
    color: white;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-weight: 500;
}

.field-count-badge {
    background: #28a745;
    color: white;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-weight: 500;
}

/* Improved form check styling */
.form-check-label {
    cursor: pointer;
    user-select: none;
}

.form-check-input {
    cursor: pointer;
}

.form-check-input:focus {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* Export filename preview */
.filename-preview {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 4px;
    padding: 0.5rem;
    font-family: monospace;
    font-size: 0.875rem;
    color: #495057;
}

/* Export statistics */
.export-stats {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: #fff;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 1rem;
}

.export-stat {
    text-align: center;
}

.export-stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: #007bff;
}

.export-stat-label {
    font-size: 0.875rem;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* =====================================================
   22. AUTHENTICATION-FRIENDLY INTERFACE STYLES
   ===================================================== */

/* Login info section for non-authenticated users */
.login-info {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.login-info .text-muted {
    color: rgba(255, 255, 255, 0.7) !important;
}

.login-info .btn {
    font-weight: 500;
    transition: all 0.2s ease;
}

.login-info .btn:hover {
    transform: translateY(-1px);
}

/* Navigation link disabled state */
.nav-link-disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: auto; /* Allow clicks for our custom handler */
    position: relative;
}

.nav-link-disabled:hover {
    background-color: rgba(255, 255, 255, 0.1) !important;
    color: var(--color-secondary) !important;
}

.nav-link-disabled::after {
    content: '\f023'; /* Font Awesome lock icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 1rem;
    opacity: 0.5;
    font-size: 0.75rem;
}

/* Demo info section */
.demo-info {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius);
    font-size: 0.85rem;
}

.demo-info h6 {
    color: white;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.demo-info ul li {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.5;
}

.demo-info i {
    width: 16px;
    text-align: center;
}

/* =====================================================
   23. DEMO PAGE STYLES
   ===================================================== */

/* Hero section */
.hero-section {
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.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="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

.hero-section .display-4 {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-section .lead {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Demo cards */
.demo-card {
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.demo-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 49%, rgba(0, 123, 255, 0.05) 50%, transparent 51%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.demo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-color: var(--color-accent);
}

.demo-card:hover::before {
    opacity: 1;
}

.demo-card .card-body {
    position: relative;
    z-index: 2;
}

/* Demo badges */
.demo-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 3;
}

.demo-badge .badge {
    font-size: 0.7rem;
    padding: 0.3rem 0.6rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

/* Feature preview section */
.feature-preview {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin: 2rem 0;
}

/* Call to action improvements */
.cta-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 123, 255, 0.05) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
    pointer-events: none;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

.cta-section .container,
.cta-section > div {
    position: relative;
    z-index: 2;
}

/* =====================================================
   24. MODAL ENHANCEMENTS
   ===================================================== */

/* Login required modal improvements */
#loginRequiredModal .modal-content {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

#loginRequiredModal .modal-header {
    background: linear-gradient(135deg, var(--color-accent) 0%, #1e40af 100%);
    color: white;
    border-bottom: none;
    padding: 1.5rem;
}

#loginRequiredModal .modal-header .btn-close {
    filter: invert(1);
    opacity: 0.8;
}

#loginRequiredModal .modal-header .btn-close:hover {
    opacity: 1;
}

#loginRequiredModal .modal-body {
    padding: 2rem;
}

#loginRequiredModal .modal-body i.fa-user-plus {
    color: var(--color-accent);
    margin-bottom: 1rem;
}

#loginRequiredModal .btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
}

/* =====================================================
   25. RESPONSIVE ENHANCEMENTS
   ===================================================== */

@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 1rem !important;
        margin-bottom: 2rem !important;
    }
    
    .hero-section h1 {
        font-size: 2rem !important;
    }
    
    .hero-section .btn {
        margin-bottom: 0.5rem;
        width: 100%;
    }
    
    .hero-section .d-flex {
        flex-direction: column;
        gap: 0.5rem !important;
    }
    
    .demo-card {
        margin-bottom: 1rem;
    }
    
    .demo-info {
        margin-top: 1rem;
        padding: 1rem;
    }
    
    .login-info {
        margin-bottom: 1rem;
        padding: 1rem;
    }
    
    .feature-preview {
        padding: 1.5rem;
        margin: 1rem 0;
    }
    
    .cta-section {
        padding: 2rem 1rem !important;
    }
    
    #loginRequiredModal .modal-body {
        padding: 1.5rem;
    }
    
    #loginRequiredModal .modal-header {
        padding: 1.25rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 2rem 1rem !important;
    }
    
    .hero-section h1 {
        font-size: 1.75rem !important;
    }
    
    .demo-card .card-body {
        padding: 1rem;
    }
    
    .demo-badge {
        top: 5px;
        right: 5px;
    }
    
    .demo-badge .badge {
        font-size: 0.6rem;
        padding: 0.2rem 0.4rem;
    }
    
    .nav-link-disabled::after {
        right: 0.5rem;
        font-size: 0.7rem;
    }
}

/* =====================================================
   26. ACCESSIBILITY IMPROVEMENTS
   ===================================================== */

/* Focus styles for demo elements */
.demo-card:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Screen reader text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .demo-card {
        border-width: 3px;
    }
    
    .hero-section {
        border: 2px solid var(--color-primary);
    }
    
    .demo-info,
    .login-info {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .demo-card,
    .btn,
    .hero-section::before,
    .cta-section::before {
        transition: none;
        animation: none;
    }
    
    .demo-card:hover {
        transform: none;
    }
}