/* AI TechStep Challenge - Mobile-First Responsive Styles */

/* Base responsive typography and spacing */
:root {
  --mobile-padding: 1rem;
  --tablet-padding: 1.5rem;
  --desktop-padding: 2rem;
  --mobile-text-base: 0.875rem;
  --tablet-text-base: 1rem;
  --desktop-text-base: 1.125rem;
}

/* Mobile-first base styles */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-size: var(--mobile-text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom animations and effects */
@keyframes bounce-in {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.05); }
  70% { transform: scale(0.9); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes slide-in-up {
  0% { transform: translateY(100px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); }
  100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

/* Mobile-optimized container styles */
.container-mobile {
  padding-left: var(--mobile-padding);
  padding-right: var(--mobile-padding);
  margin-left: auto;
  margin-right: auto;
}

/* Mobile-first button styles */
.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 0.75rem;
  text-align: center;
  display: inline-block;
  width: 100%;
  border: none;
  cursor: pointer;
  min-height: 48px; /* Touch-friendly minimum */
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Mobile-optimized quiz styles */
.quiz-option {
  transition: all 0.3s ease;
  cursor: pointer;
  padding: 1rem;
  margin-bottom: 0.75rem;
  border-radius: 0.75rem;
  border: 2px solid #e5e7eb;
  background: white;
  min-height: 60px; /* Touch-friendly */
  display: flex;
  align-items: center;
  font-size: 0.9rem;
  line-height: 1.4;
}

.quiz-option:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: #3b82f6;
}

.quiz-option.selected {
  animation: bounce-in 0.3s ease;
  border-color: #3b82f6;
  background-color: #eff6ff;
}

/* Mobile-optimized progress bar */
.progress-bar {
  transition: width 0.5s ease-in-out;
  height: 0.5rem;
  border-radius: 0.25rem;
}

/* Mobile-optimized form inputs */
.form-input {
  width: 100%;
  padding: 0.875rem;
  border: 2px solid #e5e7eb;
  border-radius: 0.75rem;
  font-size: 1rem;
  line-height: 1.4;
  background: white;
  transition: all 0.2s ease;
  min-height: 48px; /* Touch-friendly */
}

.form-input:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Mobile navigation optimizations */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid #e5e7eb;
  padding: 1rem;
  z-index: 50;
}

/* Touch-friendly spacing */
.touch-target {
  min-height: 44px;
  min-width: 44px;
  padding: 0.5rem;
}

/* Mobile-first responsive breakpoints */

/* Small mobile (320px+) */
@media (min-width: 20rem) {
  .quiz-option {
    font-size: 0.95rem;
  }
}

/* Large mobile (480px+) */
@media (min-width: 30rem) {
  :root {
    --mobile-text-base: 0.9375rem;
  }
  
  .quiz-option {
    padding: 1.25rem;
    font-size: 1rem;
  }
  
  .btn-primary {
    padding: 1rem 2rem;
    font-size: 1.125rem;
  }
}

/* Tablet (768px+) */
@media (min-width: 48rem) {
  :root {
    --mobile-padding: var(--tablet-padding);
  }
  
  body {
    font-size: var(--tablet-text-base);
  }
  
  .quiz-option {
    padding: 1.5rem;
    font-size: 1.125rem;
    margin-bottom: 1rem;
  }
  
  .btn-primary {
    width: auto;
    min-width: 200px;
    padding: 1.125rem 2.5rem;
  }
  
  /* Two-column layouts on tablets */
  .tablet-cols-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

/* Small desktop (1024px+) */
@media (min-width: 64rem) {
  :root {
    --mobile-padding: var(--desktop-padding);
  }
  
  body {
    font-size: var(--desktop-text-base);
  }
  
  .quiz-option:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
  }
  
  .btn-primary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
  }
}

/* Large desktop (1280px+) */
@media (min-width: 80rem) {
  .quiz-option {
    padding: 2rem;
    font-size: 1.25rem;
  }
}

/* Mobile-specific layout adjustments */
@media (max-width: 47.9375rem) {
  /* Hide desktop-only elements */
  .desktop-only {
    display: none !important;
  }
  
  /* Stack elements vertically on mobile */
  .mobile-stack {
    flex-direction: column;
  }
  
  .mobile-stack > * {
    width: 100%;
    margin-bottom: 1rem;
  }
  
  /* Full-width cards on mobile */
  .mobile-full-width {
    width: 100vw;
    margin-left: calc(-1 * var(--mobile-padding));
    margin-right: calc(-1 * var(--mobile-padding));
    padding-left: var(--mobile-padding);
    padding-right: var(--mobile-padding);
  }
  
  /* Simplified mobile headers */
  .mobile-header {
    text-align: center;
    padding: 2rem 1rem;
  }
  
  .mobile-header h1 {
    font-size: 1.75rem;
    line-height: 1.2;
    margin-bottom: 0.5rem;
  }
  
  .mobile-header p {
    font-size: 1rem;
    opacity: 0.8;
  }
  
  /* Mobile payment optimization */
  .payment-mobile {
    padding: 1rem;
    margin: 0;
  }
  
  .payment-mobile .form-input {
    margin-bottom: 1rem;
  }
  
  /* Mobile quiz progress */
  .quiz-progress-mobile {
    position: sticky;
    top: 0;
    background: white;
    padding: 1rem;
    border-bottom: 1px solid #e5e7eb;
    z-index: 10;
  }
}

/* Tablet-specific adjustments */
@media (min-width: 48rem) and (max-width: 63.9375rem) {
  .tablet-only {
    display: block !important;
  }
  
  /* Optimized tablet grid layouts */
  .tablet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
  }
}

/* Desktop-specific enhancements */
@media (min-width: 64rem) {
  .mobile-only {
    display: none !important;
  }
  
  .desktop-only {
    display: block !important;
  }
  
  /* Desktop hover effects */
  .desktop-hover:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15);
  }
}

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

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

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

::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.05);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

/* Dashboard styles */
.dashboard-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
  border-radius: 1rem;
  padding: 1.5rem;
}

.dashboard-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

/* Track-specific colors */
.track-digital-product {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.track-service {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.track-ecommerce {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.track-consulting {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

/* Accessibility improvements */
.focus-visible {
  outline: 3px solid #667eea;
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .quiz-option {
    border: 3px solid currentColor;
  }
  
  .btn-primary {
    border: 3px solid currentColor;
  }
}

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

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  .quiz-option {
    background: #1f2937;
    border-color: #374151;
    color: #f9fafb;
  }
  
  .quiz-option.selected {
    background-color: #1e40af;
    border-color: #3b82f6;
  }
}

/* Print styles */
@media print {
  .no-print {
    display: none !important;
  }
  
  .quiz-option {
    break-inside: avoid;
  }
}

/* Performance optimizations */
.will-change-transform {
  will-change: transform;
}

.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Mobile-specific PayPal button container */
.paypal-mobile {
  width: 100%;
  min-height: 60px;
  margin: 1rem 0;
}

.paypal-mobile iframe {
  border-radius: 0.75rem !important;
}

/* Mobile form validation */
.form-error {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: block;
}

.form-input:invalid {
  border-color: #ef4444;
}

.form-input:valid {
  border-color: #10b981;
}

/* Mobile toast notifications */
.mobile-toast {
  position: fixed;
  bottom: 2rem;
  left: 1rem;
  right: 1rem;
  background: #1f2937;
  color: white;
  padding: 1rem;
  border-radius: 0.75rem;
  z-index: 100;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
}

.mobile-toast.show {
  transform: translateY(0);
  opacity: 1;
}