/**
 * Modern Responsive CSS Framework
 * Mobile-first design for Transparent Video Creator
 */

/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary-color: #10b981;
  --secondary-dark: #059669;
  --secondary-light: #34d399;

  --background-primary: #ffffff;
  --background-secondary: #f8fafc;
  --background-tertiary: #f1f5f9;
  --background-dark: #0f172a;
  --background-dark-secondary: #1e293b;

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-color-hover: #cbd5e1;
  --border-radius: 0.75rem;
  --border-radius-sm: 0.375rem;
  --border-radius-lg: 1rem;

  --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);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Status Colors */
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --info-color: #3b82f6;

  --success-bg: #dcfdf7;
  --error-bg: #fee2e2;
  --warning-bg: #fef3c7;
  --info-bg: #dbeafe;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;

  /* Layout */
  --container-max-width: 1200px;
  --header-height: 4rem;
  --sidebar-width: 16rem;

  /* Z-index scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 500ms ease;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --background-primary: #0f172a;
    --background-secondary: #1e293b;
    --background-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --border-color-hover: #475569;
  }
}

/* ===== RESET AND BASE STYLES ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font-family-base);
  font-size: 16px;
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--background-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Better font rendering */
body {
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Remove default margins */
h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

/* Lists */
ul, ol {
  list-style: none;
}

/* Links */
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: var(--primary-dark);
}

/* Images */
img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ===== LAYOUT COMPONENTS ===== */

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

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

/* Grid system */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Responsive grid */
@media (min-width: 640px) {
  .sm\\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .sm\\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .sm\\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .sm\\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 768px) {
  .md\\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .md\\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1024px) {
  .lg\\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .lg\\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .lg\\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Flex utilities */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.gap-2 { gap: var(--spacing-sm); }
.gap-4 { gap: var(--spacing-md); }
.gap-6 { gap: var(--spacing-lg); }
.gap-8 { gap: var(--spacing-xl); }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); margin-bottom: var(--spacing-lg); }
h2 { font-size: var(--font-size-3xl); margin-bottom: var(--spacing-md); }
h3 { font-size: var(--font-size-2xl); margin-bottom: var(--spacing-md); }
h4 { font-size: var(--font-size-xl); margin-bottom: var(--spacing-sm); }
h5 { font-size: var(--font-size-lg); margin-bottom: var(--spacing-sm); }
h6 { font-size: var(--font-size-base); margin-bottom: var(--spacing-sm); }

@media (max-width: 640px) {
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-white { color: var(--text-inverse); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Button sizes */
.btn-sm {
  padding: calc(var(--spacing-xs) + 2px) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
}

.btn-xl {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* Button variants */
.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  border-color: var(--primary-color);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--secondary-dark);
  border-color: var(--secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

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

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

/* Button full width */
.btn-full {
  width: 100%;
}

/* ===== FORMS ===== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: var(--background-secondary);
}

.form-input::placeholder {
  color: var(--text-muted);
}

/* Form input sizes */
.form-input-sm {
  padding: calc(var(--spacing-xs) + 2px) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.form-input-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
}

/* ===== CARDS ===== */
.card {
  background-color: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

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

.card-header {
  padding: var(--spacing-lg) var(--spacing-lg) 0;
}

.card-footer {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Feature Cards */
.feature-card {
  background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
  border: 1px solid #374151;
  border-radius: 1rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

.feature-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  border-color: var(--primary-color);
  background: linear-gradient(135deg, #374151 0%, #1f2937 100%);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), #8b5cf6);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
  border-radius: 1rem 1rem 0 0;
}

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

.feature-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover::after {
  opacity: 1;
}

/* Hero Card */
.hero-card {
  background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
  border: 1px solid #374151;
  border-radius: 1rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

.hero-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  border-color: var(--primary-color);
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 1rem 1rem 0 0;
}

.hero-badge {
  background: rgba(55, 65, 81, 0.8);
  border: 1px solid rgba(75, 85, 99, 0.6);
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #e5e7eb;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  transition: all var(--transition-normal);
}

.hero-badge:hover {
  background: rgba(75, 85, 99, 0.8);
  transform: translateY(-1px);
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-container {
  position: relative;
  max-width: 28rem;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  z-index: 10000;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.show .modal-container {
  transform: scale(1) translateY(0);
}

.modal-content {
  background: linear-gradient(145deg, rgba(31, 41, 55, 0.95), rgba(17, 24, 39, 0.95));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(55, 65, 81, 0.5);
  border-radius: 1rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid rgba(55, 65, 81, 0.3);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  margin: 0;
}

.modal-close {
  background: transparent;
  border: none;
  color: #9ca3af;
  font-size: 1.5rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.modal-close:hover {
  background: rgba(55, 65, 81, 0.5);
  color: #ffffff;
}

.modal-body {
  padding: 1.5rem;
}

.modal-description {
  color: #d1d5db;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.modal-input {
  background: rgba(55, 65, 81, 0.5);
  border: 1px solid rgba(75, 85, 99, 0.6);
  color: #ffffff;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
  background: rgba(75, 85, 99, 0.6);
}

.modal-input::placeholder {
  color: #9ca3af;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
}

.modal-actions .btn {
  flex: 1;
}

/* ===== ALERTS & NOTIFICATIONS ===== */
.alert {
  padding: var(--spacing-md);
  border: 1px solid;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
}

.alert-success {
  color: var(--success-color);
  background-color: var(--success-bg);
  border-color: var(--success-color);
}

.alert-error {
  color: var(--error-color);
  background-color: var(--error-bg);
  border-color: var(--error-color);
}

.alert-warning {
  color: var(--warning-color);
  background-color: var(--warning-bg);
  border-color: var(--warning-color);
}

.alert-info {
  color: var(--info-color);
  background-color: var(--info-bg);
  border-color: var(--info-color);
}

/* Toast notifications */
.toast {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background-color: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-md);
  max-width: 400px;
  z-index: var(--z-toast);
  animation: slideIn 0.3s ease;
}

.toast.fade-out {
  animation: slideOut 0.3s ease;
}

.toast-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.toast-close {
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  cursor: pointer;
  color: var(--text-muted);
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
}

.toast-close:hover {
  background-color: var(--background-secondary);
  color: var(--text-primary);
}

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

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

/* ===== PROGRESS ===== */
.progress {
  width: 100%;
  height: 0.5rem;
  background-color: var(--background-secondary);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
  border-radius: inherit;
}

.progress-lg {
  height: 1rem;
}

.progress-sm {
  height: 0.25rem;
}

/* ===== DROPZONE ===== */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  background-color: var(--background-secondary);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.dropzone:hover {
  border-color: var(--primary-color);
  border-width: 3px;
  background-color: var(--background-secondary);
  box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.1);
}

.dropzone.drag-over {
  border-color: var(--primary-color);
  border-width: 3px;
  background-color: rgba(99, 102, 241, 0.05);
  transform: scale(1.02);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

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

.dropzone-icon {
  font-size: var(--font-size-4xl);
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.dropzone-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.dropzone-subtext {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ===== RESPONSIVE UTILITIES ===== */

/* Display utilities */
.hidden { display: none !important; }
.block { display: block !important; }
.inline-block { display: inline-block !important; }

/* Responsive display */
@media (max-width: 640px) {
  .sm\\:hidden { display: none !important; }
  .sm\\:block { display: block !important; }
}

@media (min-width: 641px) and (max-width: 768px) {
  .md\\:hidden { display: none !important; }
  .md\\:block { display: block !important; }
}

@media (min-width: 769px) {
  .lg\\:hidden { display: none !important; }
  .lg\\:block { display: block !important; }
}

/* Spacing utilities */
.m-0 { margin: 0 !important; }
.m-1 { margin: var(--spacing-xs) !important; }
.m-2 { margin: var(--spacing-sm) !important; }
.m-4 { margin: var(--spacing-md) !important; }
.m-6 { margin: var(--spacing-lg) !important; }
.m-8 { margin: var(--spacing-xl) !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-xs) !important; }
.p-2 { padding: var(--spacing-sm) !important; }
.p-4 { padding: var(--spacing-md) !important; }
.p-6 { padding: var(--spacing-lg) !important; }
.p-8 { padding: var(--spacing-xl) !important; }

/* Margin/padding directions */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.ml-0 { margin-left: 0 !important; }
.mr-0 { margin-right: 0 !important; }

.pt-0 { padding-top: 0 !important; }
.pb-0 { padding-bottom: 0 !important; }
.pl-0 { padding-left: 0 !important; }
.pr-0 { padding-right: 0 !important; }

/* Text alignment */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

/* ===== DEVICE-SPECIFIC STYLES ===== */

/* Mobile devices */
.mobile-device {
  --container-max-width: 100%;
}

.mobile-device .btn {
  min-height: 44px; /* iOS touch target */
  padding: var(--spacing-sm) var(--spacing-lg);
}

.mobile-device .form-input,
.mobile-device .form-select {
  min-height: 44px;
  font-size: 16px; /* Prevent zoom on iOS */
}

.mobile-device .dropzone {
  padding: var(--spacing-lg);
}

/* Tablet devices */
.tablet-device .container {
  padding: 0 var(--spacing-lg);
}

/* Touch devices */
.touch-device .btn:hover {
  transform: none; /* Disable hover effects on touch */
}

.touch-device .card:hover {
  transform: none;
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .btn {
    border-width: 0.5px;
  }
}

/* ===== PROGRESS TIMELINE ===== */
.progress-timeline {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) 0;
  position: relative;
  overflow-x: auto;
  min-height: 120px;
}

.timeline-container {
  display: flex;
  align-items: center;
  position: relative;
  min-width: max-content;
}

.timeline-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 2;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.timeline-step:hover .step-circle {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.step-circle {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  transition: all var(--transition-normal);
  position: relative;
  border: 3px solid transparent;
  box-shadow: var(--shadow-sm);
}

.step-number, .step-icon {
  position: absolute;
  transition: all var(--transition-fast);
}

.step-icon {
  opacity: 0;
  transform: scale(0.5);
  font-size: var(--font-size-xl);
}

.step-circle::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.step-label {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-align: center;
  transition: all var(--transition-normal);
  min-width: 80px;
}

.step-description {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-align: center;
  opacity: 0;
  transform: translateY(-5px);
  transition: all var(--transition-normal);
}

/* Timeline connector line */
.timeline-connector {
  height: 3px;
  background: var(--border-color);
  position: relative;
  z-index: 1;
  transition: all var(--transition-slow);
  margin: 0 var(--spacing-md);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
}

.timeline-connector::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
  border-radius: inherit;
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

/* Step states */
.timeline-step.pending .step-circle {
  background: var(--background-secondary);
  color: var(--text-muted);
  border-color: var(--border-color);
}

.timeline-step.active .step-circle {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: var(--text-inverse);
  border-color: var(--primary-color);
  animation: pulse-glow 2s infinite;
}

.timeline-step.active .step-circle::before {
  opacity: 1;
}

.timeline-step.active .step-number {
  opacity: 0;
  transform: scale(0.5);
}

.timeline-step.active .step-icon {
  opacity: 1;
  transform: scale(1);
}

.timeline-step.active .step-label {
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
}

.timeline-step.active .step-description {
  opacity: 1;
  transform: translateY(0);
}

.timeline-step.completed .step-circle {
  background: linear-gradient(135deg, var(--success-color), var(--secondary-light));
  color: var(--text-inverse);
  border-color: var(--success-color);
}

.timeline-step.completed .step-number,
.timeline-step.completed .step-icon {
  opacity: 0;
  transform: scale(0.5);
}

.timeline-step.completed .step-circle::after {
  content: '✓';
  position: absolute;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  opacity: 1;
  transform: scale(1);
  animation: checkmark-pop 0.3s ease;
}

.timeline-step.completed .step-label {
  color: var(--success-color);
}

.timeline-step.completed + .timeline-connector::before {
  transform: translateX(0);
}

.timeline-step.processing .step-circle {
  background: linear-gradient(135deg, var(--warning-color), #fbbf24);
  color: var(--text-inverse);
  border-color: var(--warning-color);
}

.timeline-step.processing .step-number {
  opacity: 0;
  transform: scale(0.5);
}

.timeline-step.processing .step-icon {
  opacity: 1;
  transform: scale(1);
  animation: spin 2s linear infinite;
}

.timeline-step.processing .step-label {
  color: var(--warning-color);
}

/* Mobile responsive timeline */
@media (max-width: 768px) {
  .progress-timeline {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .timeline-container {
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .timeline-connector {
    width: 3px;
    height: 40px;
    margin: 0;
    transform: rotate(90deg);
  }

  .timeline-connector::before {
    transform: translateY(-100%);
  }

  .timeline-step.completed + .timeline-connector::before {
    transform: translateY(0);
  }

  .step-circle {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-base);
  }

  .step-label {
    font-size: var(--font-size-xs);
    min-width: 60px;
  }

  .step-description {
    font-size: 10px;
  }
}

/* Tablet responsive */
@media (min-width: 769px) and (max-width: 1024px) {
  .timeline-connector {
    width: 60px;
  }

  .step-circle {
    width: 55px;
    height: 55px;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

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

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(99, 102, 241, 0);
  }
}

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

@keyframes progress-flow {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(0); }
}

@keyframes checkmark-pop {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Animation classes */
.animate-fadeIn { animation: fadeIn 0.3s ease; }
.animate-slideUp { animation: slideUp 0.3s ease; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Timeline entrance animations */
.timeline-step {
  opacity: 0;
  transform: translateY(20px);
  animation: slideUp 0.4s ease forwards;
}

.timeline-step:nth-child(1) { animation-delay: 0.1s; }
.timeline-step:nth-child(3) { animation-delay: 0.2s; }
.timeline-step:nth-child(5) { animation-delay: 0.3s; }
.timeline-step:nth-child(7) { animation-delay: 0.4s; }

/* ===== ACCESSIBILITY ===== */

/* Screen reader only */
.sr-only {
  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;
}

/* Reduce motion for accessibility */
@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;
  }
}