/* main.css - Professional Light Mode Stylesheet
   Optimized for Performance, SEO, and International Users
   No Dark Mode, Minimal Hovers, Clean & Fast
*/

:root {
  /* Primary Color System - Professional & Trustworthy */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --primary-soft: #eff6ff;
  
  /* Secondary Colors */
  --secondary: #3b82f6;
  --secondary-dark: #2563eb;
  --accent: #10b981;
  --accent-hover: #059669;
  
  /* Neutral Colors - Clean & Readable */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-overlay: rgba(0, 0, 0, 0.05);
  --bg-hover: #f1f5f9;
  
  /* Text Colors - High Contrast for Accessibility */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-disabled: #94a3b8;
  --text-light: #ffffff;
  
  /* Border Colors - Subtle & Defined */
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-heavy: #94a3b8;
  --border-focus: var(--primary);
  
  /* Shadows - Minimal & Professional */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.02), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.03), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-focus: 0 0 0 3px rgba(37, 99, 235, 0.1);
  
  /* Gradients - Subtle & Clean */
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--primary-dark));
  --gradient-secondary: linear-gradient(135deg, var(--secondary), var(--primary-dark));
  --gradient-accent: linear-gradient(135deg, var(--accent), #059669);
  --gradient-hero: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
  
  /* Typography - Modern & Readable */
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Roboto Mono', monospace;
  
  /* Font Sizes - Responsive & Accessible */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Spacing - Consistent Rhythm */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius - Rounded but Professional */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions - Fast & Performant */
  --transition-fast: 0.1s ease;
  --transition-normal: 0.15s ease;
  --transition-slow: 0.2s ease;
  
  /* Z-index Layers */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
  
  /* Layout Constants */
  --header-height: 4rem;
  --sidebar-width: 22rem;
  --max-width: 1280px;
  --container-padding: 1.5rem;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  padding-top: 70px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

h1 { font-size: var(--text-4xl); letter-spacing: -0.02em; }
h2 { font-size: var(--text-3xl); letter-spacing: -0.01em; }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

/* Utility Text Classes */
small, .text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }

/* Container System */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

.container-fluid {
  width: 100%;
  padding: 0 var(--container-padding);
}

/* Header Section */
.head-cont {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6) 0;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  gap: var(--space-4);
  border-bottom: 1px solid var(--border-light);
}

.header-content {
  flex: 1;
  min-width: 280px;
}

.header-content h1 {
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.header-content .subtitle {
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: 1.5;
}

.header-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
}

.conversion-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.conversion-links a:hover {
  color: var(--primary);
}

/* Main Layout Grid */
.main-layout {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-8);
  align-items: start;
  margin-bottom: var(--space-12);
}

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

/* Loading State */
.loading {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.5rem;
  height: 1.5rem;
  margin: -0.75rem 0 0 -0.75rem;
  border: 2px solid var(--border-light);
  border-top-color: var(--primary);
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

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

/* Focus Ring for Accessibility */
.focus-ring:focus-visible,
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
    padding-top: 0;
  }
  
  .no-print,
  .header-actions,
  .toolbar,
  .ad-container,
  .hero-section,
  .cta-section,
  .sidebar-ad-container {
    display: none !important;
  }
  
  .card {
    border: 1px solid #ccc;
    box-shadow: none;
    break-inside: avoid;
  }
  
  .file-list {
    max-height: none;
    overflow: visible;
  }
}

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

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

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

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

/* Selection Styling */
::selection {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  border-color: var(--border-medium);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-light);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  margin-bottom: var(--space-6);
  background: var(--bg-secondary);
}

.drop-zone.active {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.drop-content {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex: 1;
}

.drop-icon {
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-lg);
  background: var(--primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.5rem;
}

.drop-text h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.drop-text p {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin: 0;
}

.drop-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: flex-end;
  min-width: 250px;
}

/* Toolbar */
.toolbar {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Buttons - Clean & Minimal */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-medium);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
  line-height: 1;
}

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

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

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

/* Button Variants */
.btn-primary {
  background: var(--gradient-primary);
  border: none;
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  filter: brightness(0.95);
}

.btn-secondary {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
}

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

.btn-accent {
  background: var(--gradient-accent);
  border: none;
  color: var(--text-light);
}

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

.btn-outline:hover {
  background: var(--primary-soft);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
}

.btn-icon {
  padding: var(--space-3);
  width: 2.5rem;
  height: 2.5rem;
}

.btn-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* Progress Bar */
.progress {
  height: 0.5rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  width: 100%;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 0.2s ease;
}

/* File List */
.file-list {
  max-height: 24rem;
  overflow-y: auto;
  border-radius: var(--radius-lg);
}

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

.file-item {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  margin-bottom: var(--space-3);
  transition: border-color var(--transition-fast);
  background: var(--bg-card);
}

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

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

.file-thumb {
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-md);
  object-fit: cover;
  border: 1px solid var(--border-light);
  flex-shrink: 0;
}

.file-meta {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-weight: 600;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.file-details {
  color: var(--text-muted);
  font-size: var(--text-xs);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
}

.file-status {
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-queued {
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.status-processing {
  background: #eff6ff;
  color: var(--primary);
}

.status-done {
  background: #ecfdf5;
  color: var(--accent);
}

.status-error {
  background: #fef2f2;
  color: #ef4444;
}

.file-progress {
  margin-top: var(--space-2);
}

.file-actions {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* Preview Area */
.preview-area {
  min-height: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  border: 2px dashed var(--border-light);
  padding: var(--space-6);
  transition: border-color var(--transition-fast);
}

.preview-area.has-content {
  border-style: solid;
  background: var(--bg-card);
}

.preview-image {
  max-width: 100%;
  max-height: 20rem;
  border-radius: var(--radius-md);
}

/* Form Controls */
.control-group {
  margin-bottom: var(--space-5);
}

.control-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.control-row {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

select,
input[type="range"],
input[type="number"],
input[type="text"],
input[type="color"],
textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-medium);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--text-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  font-family: var(--font-family);
}

select:focus,
input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--shadow-focus);
}

input[type="range"] {
  padding: var(--space-3) 0;
}

input[type="color"] {
  height: 2.5rem;
  padding: var(--space-2);
  cursor: pointer;
}

input[type="checkbox"] {
  width: 1.125rem;
  height: 1.125rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-medium);
  background: var(--bg-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  position: relative;
}

input[type="checkbox"]:checked {
  background: var(--primary);
  border-color: var(--primary);
}

input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: var(--text-xs);
  font-weight: 700;
}

/* Format Grid */
.format-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(8rem, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.format-option {
  padding: var(--space-3) var(--space-2);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-light);
  font-size: var(--text-sm);
  font-weight: 500;
}

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

.format-option.active {
  background: var(--primary);
  color: var(--text-light);
  border-color: var(--primary);
}

.format-option.popular {
  position: relative;
}

.format-option.popular::after {
  content: 'Popular';
  position: absolute;
  top: -0.5rem;
  right: -0.5rem;
  background: var(--accent);
  color: var(--text-light);
  font-size: var(--text-xs);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* Stats Section */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.stat-item {
  text-align: center;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  transition: border-color var(--transition-fast);
}

.stat-item:hover {
  border-color: var(--border-medium);
}

.stat-value {
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--primary);
  display: block;
  margin-bottom: var(--space-1);
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 500;
}

/* Advanced Toggle */
.advanced-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  margin-top: var(--space-4);
  padding: var(--space-3) 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.advanced-toggle:hover {
  color: var(--text-primary);
}

.advanced-toggle i {
  transition: transform var(--transition-fast);
  font-size: var(--text-xs);
}

.advanced-toggle.expanded i {
  transform: rotate(180deg);
}

.advanced-options {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease;
  border-top: 1px solid transparent;
}

.advanced-options.expanded {
  max-height: 32rem;
  border-top-color: var(--border-light);
  padding-top: var(--space-4);
}

/* Ad Containers */
.ad-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-4) 0;
}

.top-ad-container {
  margin: var(--space-6) auto;
  padding: var(--space-4);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
}

.sidebar-ad-container {
  margin: 0 0 var(--space-6) 0;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-overlay);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--space-6);
  backdrop-filter: blur(4px);
}

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  max-width: 32rem;
  width: 100%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
}

.modal-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
  margin: 0;
  font-size: var(--text-xl);
}

.modal-body {
  margin-bottom: var(--space-6);
  color: var(--text-secondary);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* Tooltip */
.tool-tip {
  position: relative;
  display: inline-block;
  cursor: help;
}

.tool-tip .tool-tip-text {
  visibility: hidden;
  width: 12rem;
  background: var(--text-primary);
  color: var(--text-light);
  text-align: center;
  border-radius: var(--radius-md);
  padding: var(--space-3);
  position: absolute;
  z-index: var(--z-tooltip);
  bottom: 125%;
  left: 50%;
  margin-left: -6rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-md);
}

.tool-tip .tool-tip-text::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: var(--text-primary) transparent transparent transparent;
}

.tool-tip:hover .tool-tip-text {
  visibility: visible;
  opacity: 1;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-8);
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

/* Hero Section */
.hero-section {
  background: var(--gradient-hero);
  padding: var(--space-20) 0;
  text-align: center;
  margin-top: var(--space-8);
  border-bottom: 1px solid var(--border-light);
}

.hero-content h2 {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-6);
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  flex-wrap: wrap;
  margin-top: var(--space-12);
  padding: var(--space-8);
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-light);
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-weight: 500;
}

/* Features & Use Cases Sections */
.features-section,
.usecases-section,
.comparison-section,
.workflow-section,
.faq-section {
  padding: var(--space-20) 0;
  border-bottom: 1px solid var(--border-light);
}

.features-section h2,
.usecases-section h2,
.comparison-section h2,
.workflow-section h2,
.faq-section h2 {
  text-align: center;
  margin-bottom: var(--space-12);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.feature-card,
.usecase-column {
  background: var(--bg-card);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  transition: border-color var(--transition-fast);
}

.feature-card:hover,
.usecase-column:hover {
  border-color: var(--border-medium);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.feature-card h3,
.usecase-column h3 {
  margin-bottom: var(--space-4);
}

.feature-card p,
.usecase-column ul {
  color: var(--text-secondary);
  line-height: 1.6;
}

.usecase-column ul {
  list-style: none;
  padding: 0;
}

.usecase-column li {
  padding: var(--space-2) 0;
  padding-left: 1.5rem;
  position: relative;
  border-bottom: 1px solid var(--border-light);
}

.usecase-column li:last-child {
  border-bottom: none;
}

.usecase-column li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

/* Comparison Table */
.comparison-table {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  overflow-x: auto;
  border: 1px solid var(--border-light);
}

.table-header {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr;
  background: var(--bg-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-light);
}

.table-row {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr;
  border-bottom: 1px solid var(--border-light);
}

.table-row:last-child {
  border-bottom: none;
}

.table-cell {
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
}

/* Workflow Steps */
.workflow-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-8);
}

.workflow-step {
  text-align: center;
  padding: var(--space-8);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
}

.step-number {
  width: 4rem;
  height: 4rem;
  background: var(--primary);
  color: var(--text-light);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto var(--space-6);
}

.workflow-step h3 {
  margin-bottom: var(--space-4);
}

.workflow-step p {
  color: var(--text-secondary);
}

/* FAQ Grid */
.faq-grid {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  border: 1px solid var(--border-light);
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-item h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

.faq-item p {
  color: var(--text-secondary);
  margin: 0;
}

/* CTA Section */
.cta-section {
  padding: var(--space-20) 0;
  background: var(--gradient-hero);
  text-align: center;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.cta-content h2 {
  margin-bottom: var(--space-4);
}

.cta-content p {
  font-size: var(--text-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-8);
}

.cta-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Utility Classes */
.fade-in {
  animation: fadeIn 0.3s ease;
}

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

.slide-up {
  animation: slideUp 0.3s ease;
}

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

.hidden {
  display: none !important;
}

.invisible {
  visibility: hidden;
}

.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

.pointer-events-none {
  pointer-events: none;
}

.cursor-pointer {
  cursor: pointer;
}

.cursor-not-allowed {
  cursor: not-allowed;
}

.select-none {
  user-select: none;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .drop-zone {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .drop-content {
    flex-direction: column;
    text-align: center;
  }
  
  .drop-actions {
    width: 100%;
    align-items: stretch;
  }
  
  .toolbar {
    width: 100%;
  }
  
  .btn {
    flex: 1;
    justify-content: center;
  }
  
  .hero-stats {
    gap: var(--space-6);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 3.5rem;
    --container-padding: 1rem;
  }
  
  body {
    padding-top: 60px;
  }
  
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }
  
  .head-cont {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .card {
    padding: var(--space-4);
  }
  
  .drop-zone {
    padding: var(--space-6);
  }
  
  .file-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .file-actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .stats {
    grid-template-columns: 1fr;
  }
  
  .control-row {
    flex-direction: column;
  }
  
  .hero-section,
  .features-section,
  .usecases-section,
  .comparison-section,
  .workflow-section,
  .faq-section,
  .cta-section {
    padding: var(--space-12) 0;
  }
  
  .hero-content h2 {
    font-size: var(--text-3xl);
  }
  
  .hero-subtitle {
    font-size: var(--text-lg);
  }
  
  .table-header,
  .table-row {
    grid-template-columns: 1fr;
  }
  
  .table-cell {
    justify-content: center;
    text-align: center;
    padding: var(--space-3);
  }
  
  .table-header .table-cell {
    background: var(--bg-secondary);
    font-weight: 700;
  }
  
  .workflow-steps {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .modal-content {
    padding: var(--space-6);
    margin: var(--space-4);
  }
  
  .modal-footer {
    flex-direction: column;
  }
  
  .modal-footer .btn {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .header-actions {
    display: none;
  }
  
  .format-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .usecases-container {
    grid-template-columns: 1fr;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-buttons .btn {
    width: 100%;
    max-width: 280px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .format-grid {
    grid-template-columns: 1fr;
  }
  
  .file-details {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }
  
  .toolbar {
    flex-direction: column;
  }
  
  .toolbar .btn {
    width: 100%;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-6);
  }
  
  .stat {
    border-bottom: 1px solid var(--border-light);
    padding-bottom: var(--space-4);
  }
  
  .stat:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
}
/* File Name Truncation - Hide Long Names */
.file-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: block;
}

/* For better control on different screen sizes */
@media (min-width: 769px) {
  .file-name {
    max-width: 300px;
  }
}

@media (max-width: 768px) {
  .file-name {
    max-width: 200px;
  }
}

@media (max-width: 480px) {
  .file-name {
    max-width: 150px;
  }
}

/* Optional: Show full filename on hover as tooltip */
.file-name[title] {
  cursor: help;
}

/* Alternative: Show full filename on hover by expanding */
.file-name:hover {
  overflow: visible;
  white-space: normal;
  word-break: break-all;
  background: var(--bg-card);
  position: relative;
  z-index: 1;
  padding: 2px 4px;
  margin: -2px -4px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* For touch devices - tap to see full name */
@media (hover: none) {
  .file-name:active {
    overflow: visible;
    white-space: normal;
    word-break: break-all;
    background: var(--bg-card);
    position: relative;
    z-index: 1;
  }
}