/* CSS Custom Properties */
:root {
  /* Colors - Dark Theme */
  --bg-primary: #000000;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-quaternary: #222222;
  --bg-card: #161616;
  --bg-hover: #2a2a2a;
  
  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-tertiary: #737373;
  --text-muted: #525252;
  
  --border-primary: #262626;
  --border-secondary: #404040;
  --border-hover: #525252;
  
  --accent-primary: #8b5cf6;
  --accent-primary-hover: #7c3aed;
  --accent-secondary: #06b6d4;
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  
  /* Language Colors */
  --python: #3776ab;
  --javascript: #f7df1e;
  --typescript: #3178c6;
  --html: #e34f26;
  --other: #8b5cf6;
  
  /* 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;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', 'Source Code Pro', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
}

/* Light Theme */
.theme-light {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-quaternary: #e5e7eb;
  --bg-card: #ffffff;
  --bg-hover: #f3f4f6;
  
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-tertiary: #6b7280;
  --text-muted: #9ca3af;
  
  --border-primary: #e5e7eb;
  --border-secondary: #d1d5db;
  --border-hover: #9ca3af;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 50%;
  right: var(--spacing-lg);
  transform: translateY(-50%);
  z-index: 1000;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-primary);
  border-radius: 50%;
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.theme-icon {
  transition: opacity 0.3s ease;
}

.theme-dark .theme-icon-light,
.theme-light .theme-icon-dark {
  display: none;
}

/* Utility Classes */
.min-h-screen { min-height: 100vh; }
.hidden { display: none; }
.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; }

/* Background Gradient */
.bg-gradient {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
  min-height: 100vh;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(0, 0, 0, 0.8);
  border-bottom: 1px solid var(--border-primary);
  padding: var(--spacing-md) 0;
}

.theme-light .header {
  background: rgba(255, 255, 255, 0.8);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* Hero Section */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradient-shift 3s ease-in-out infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

/* Language Badges */
.language-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.language-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: 9999px;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  transition: all 0.3s ease;
}

.language-badge:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.bg-python { background-color: var(--python); }
.bg-javascript { background-color: var(--javascript); }
.bg-typescript { background-color: var(--typescript); }
.bg-html { background-color: var(--html); }
.bg-other { background-color: var(--other); }

/* Main Content */
.main-content {
  padding: var(--spacing-xl) 0;
}

/* Upload Section */
.upload-section {
  margin-bottom: var(--spacing-xl);
}

.upload-area {
  border: 2px dashed var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  background: var(--bg-card);
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--accent-primary);
  background: var(--bg-hover);
}

.upload-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.upload-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: transform 0.3s ease;
}

.upload-area:hover .upload-icon {
  transform: scale(1.1);
}

.upload-text h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.upload-text p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.upload-text small {
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.upload-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  background: transparent;
}

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

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

.btn-primary:hover:not(:disabled) {
  background: var(--accent-primary-hover);
}

.btn-outline {
  border-color: var(--border-secondary);
  color: var(--text-secondary);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-hover);
}

.btn-ghost {
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--text-primary);
  background: var(--bg-hover);
}

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

.btn-success:hover:not(:disabled) {
  background: #059669;
}

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

.btn-warning:hover:not(:disabled) {
  background: #d97706;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
}

/* Cards and Sections */
.selected-files,
.processing,
.results,
.code-preview {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  animation: slide-up 0.5s ease-out;
}

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

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

.section-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 600;
}

.file-count {
  background: rgba(139, 92, 246, 0.2);
  color: var(--accent-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-left: var(--spacing-sm);
}

.section-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* File List */
.file-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  max-height: 400px;
  overflow-y: auto;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: between;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.3s ease;
}

.file-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.file-item-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
}

.file-icon {
  width: 40px;
  height: 40px;
  background: rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
}

.file-info h4 {
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.file-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

/* Cleaning Options */
.cleaning-options {
  margin-bottom: var(--spacing-lg);
}

.options-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.option-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.3s ease;
}

.option-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.option-item input[type="checkbox"] {
  display: none;
}

.checkmark {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: all 0.3s ease;
}

.option-item input[type="checkbox"]:checked + .checkmark {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.option-item input[type="checkbox"]:checked + .checkmark::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.option-text {
  flex: 1;
  font-weight: 500;
}

.beta-tag {
  background: var(--accent-warning);
  color: white;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: var(--spacing-sm);
}

.process-actions {
  text-align: center;
}

/* Processing */
.processing-header,
.results-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.processing-icon,
.results-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin: 0 auto var(--spacing-md);
}

.processing-icon .spin {
  animation: spin 1s linear infinite;
}

.results-icon {
  background: var(--accent-success);
  animation: bounce 1s ease-in-out;
}

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

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% { transform: translateY(0); }
  40%, 43% { transform: translateY(-30px); }
  70% { transform: translateY(-15px); }
  90% { transform: translateY(-4px); }
}

.processing-header h3,
.results-header h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.processing-header p,
.results-header p {
  color: var(--text-secondary);
}

/* Progress Bar */
.progress-container {
  margin-bottom: var(--spacing-lg);
}

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

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 9999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 9999px;
  transition: width 0.3s ease;
  width: 0%;
}

/* Processing List */
.processing-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 300px;
  overflow-y: auto;
}

.processing-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.3s ease;
}

.processing-item.active {
  border-color: var(--accent-primary);
  background: rgba(139, 92, 246, 0.1);
}

.processing-item.completed {
  border-color: var(--accent-success);
  background: rgba(16, 185, 129, 0.1);
}

.processing-item-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.processing-status {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
}

.processing-status.waiting {
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
}

.processing-status.active {
  background: var(--accent-primary);
  color: white;
  animation: pulse 1.5s ease-in-out infinite;
}

.processing-status.completed {
  background: var(--accent-success);
  color: white;
}

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

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all 0.3s ease;
}

.stat-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.stat-card svg {
  color: var(--accent-primary);
  margin-bottom: var(--spacing-md);
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Download Section */
.download-section {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* Cleaning Log */
.cleaning-log {
  border-top: 1px solid var(--border-primary);
  padding-top: var(--spacing-lg);
}

.log-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.log-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  max-height: 200px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
}

.log-entry {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.log-entry:last-child {
  margin-bottom: 0;
}

.log-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.log-icon.success { color: var(--accent-success); }
.log-icon.warning { color: var(--accent-warning); }
.log-icon.info { color: var(--accent-secondary); }

/* Code Preview */
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-primary);
  padding-bottom: var(--spacing-md);
}

.preview-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.preview-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.preview-panel {
  display: flex;
  flex-direction: column;
  min-height: 400px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.panel-header h4 {
  font-weight: 600;
}

.line-count {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.code-block {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  overflow: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal.hidden {
  display: none !important;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: scale-in 0.3s ease-out;
}

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

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

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

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

.modal-body p {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.modal-body p:last-child {
  margin-bottom: 0;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-primary);
}

/* Notifications */
.notifications {
  position: fixed;
  top: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-width: 400px;
  width: 100%;
}

.notification {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  animation: notification-in 0.3s ease-out;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.notification.success {
  border-color: var(--accent-success);
}

.notification.error {
  border-color: var(--accent-danger);
}

.notification.warning {
  border-color: var(--accent-warning);
}

.notification.info {
  border-color: var(--accent-secondary);
}

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

.notification-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.notification.success .notification-icon { color: var(--accent-success); }
.notification.error .notification-icon { color: var(--accent-danger); }
.notification.warning .notification-icon { color: var(--accent-warning); }
.notification.info .notification-icon { color: var(--accent-secondary); }

.notification-content {
  flex: 1;
}

.notification-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.notification-message {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Feature Cards */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all 0.3s ease;
  animation: slide-up 0.5s ease-out;
}

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

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  color: white;
}

.feature-icon.security {
  background: linear-gradient(135deg, #10b981, #059669);
}

.feature-icon.performance {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.feature-icon.languages {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

.feature-icon.open-source {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.feature-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

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

/* Features Section */
.features-section {
  padding: var(--spacing-4xl) 0;
  margin-top: var(--spacing-4xl);
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
}

.footer-content {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-content p {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.heart {
  color: #ef4444;
  font-size: 1rem;
  animation: heartbeat 1.5s ease-in-out infinite;
  filter: drop-shadow(0 0 6px rgba(239, 68, 68, 0.5));
}

@keyframes heartbeat {
  0%, 50%, 100% {
    transform: scale(1);
  }
  25%, 75% {
    transform: scale(1.1);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .upload-area {
    padding: var(--spacing-lg);
  }
  
  .upload-actions {
    flex-direction: column;
  }
  
  .section-header {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: flex-start;
  }
  
  .options-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .preview-content {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    margin: var(--spacing-md);
  }
  
  .notifications {
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    transform: none;
  }
  
  .feature-cards {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .theme-toggle {
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    transform: none;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .language-badges {
    flex-direction: column;
    align-items: center;
  }
  
  .file-item-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .modal-footer {
    flex-direction: column;
  }
}

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

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

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

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

/* Focus States */
.btn:focus,
input:focus,
button:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .theme-toggle,
  .notifications,
  .modal {
    display: none !important;
  }
}