/**
 * OpenGraph Preview Simulator Styles
 * Clean, modern design with platform-specific social media card styling
 */

/* CSS Custom Properties */
:root {
  /* Colors - Light theme with gradient header */
  --color-primary: #667eea;
  --color-primary-hover: #5a67d8;
  --color-secondary: #6b7280;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-border: #e5e7eb;
  --color-text-primary: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;

  /* Platform Colors */
  --color-facebook: #1877f2;
  --color-twitter: #1da1f2;
  --color-linkedin: #0077b5;
  --color-pinterest: #e60023;

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

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --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: 2rem;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 200ms ease-in-out;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: var(--line-height-normal);
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding: var(--spacing-2xl) 0;
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 150px 120px, rgba(255, 255, 255, 0.08) 180px, transparent 181px),
    radial-gradient(circle at calc(100% - 150px) calc(100% - 120px), rgba(255, 255, 255, 0.08) 140px, transparent 141px),
    radial-gradient(circle at 80px 60%, rgba(255, 255, 255, 0.08) 100px, transparent 101px),
    radial-gradient(circle at calc(100% - 120px) 90px, rgba(255, 255, 255, 0.08) 80px, transparent 81px);
  pointer-events: none;
}

.app-header .container {
  position: relative;
  z-index: 1;
}

.app-title {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 3rem;
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  justify-content: center;
  text-align: center;
}

.app-icon {
  font-size: 2.5rem;
}

.app-subtitle {
  margin: 0;
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
  font-weight: 400;
  text-align: center;
}

/* Main Content */
.app-main {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

/* URL Input Section */
.url-input-section {
  margin-bottom: var(--spacing-2xl);
}

.input-group {
  margin-bottom: var(--spacing-lg);
}

.input-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.input-container {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 600px;
}

.url-input {
  flex: 1;
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
  background-color: var(--color-background);
  color: var(--color-text-primary);
}

.url-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

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

.fetch-button {
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-width: 100px;
  justify-content: center;
}

.fetch-button:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.fetch-button:disabled {
  background-color: var(--color-text-muted);
  cursor: not-allowed;
}

.fetch-button.loading .button-text {
  opacity: 0;
}

.fetch-button.loading .button-spinner {
  opacity: 1;
}

.button-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  opacity: 0;
  position: absolute;
}

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

/* Error and Loading States */
.error-display {
  display: none;
  padding: var(--spacing-md);
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  color: var(--color-error);
  max-width: 600px;
}

.error-display.visible {
  display: block;
}

.loading-display {
  display: none;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.loading-display.visible {
  display: flex;
}

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Results Section */
.results-section {
  display: none;
  margin-bottom: var(--spacing-2xl);
}

.results-section.visible {
  display: block;
}

/* Platform Previews */
.platform-previews {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.platform-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-surface);
  transition: box-shadow var(--transition-fast);
}

.platform-section:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.platform-header {
  background-color: var(--color-background);
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.platform-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.platform-icon {
  font-size: 1.2em;
}

.platform-content {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: var(--spacing-xl);
  padding: var(--spacing-lg);
}

@media (max-width: 1024px) {
  .platform-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

/* Platform Preview */
.platform-preview {
  background-color: var(--color-surface);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.preview-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

/* Social Media Cards */
.social-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-background);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  transition: box-shadow var(--transition-fast);
  max-width: 500px;
  width: 100%;
}

.social-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.social-card__container {
  display: flex;
  flex-direction: column;
}

.social-card__image {
  position: relative;
  overflow: hidden;
}

.social-card__image img {
  width: 100%;
  height: auto;
  display: block;
}

/* Platform-specific card styles */
.social-card--facebook .social-card__image {
  aspect-ratio: 1.91 / 1;
}

.social-card--twitter .social-card__image {
  aspect-ratio: 16 / 9;
}

.social-card--twitter .social-card__image--summary {
  aspect-ratio: 1 / 1;
  max-width: 125px;
  float: right;
  margin-left: var(--spacing-md);
}

.social-card--linkedin .social-card__image {
  aspect-ratio: 1.91 / 1;
}

/* LinkedIn 2024 Horizontal Layout */
.social-card__container--horizontal {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.social-card__image--thumbnail {
  flex-shrink: 0;
  width: 120px;
  height: 80px;
}

.social-card__image--thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.social-card--linkedin[data-layout="2024"] .social-card__content {
  padding: 0;
  flex: 1;
}

.social-card--pinterest {
  max-width: 300px;
}

.social-card--pinterest .social-card__image {
  aspect-ratio: 2 / 3;
}

.social-card__content {
  padding: var(--spacing-md);
}

.social-card__title {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

.social-card__description {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  color: var(--color-text-secondary);
}

.social-card__meta {
  margin-top: auto;
}

.social-card__site-name {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-weight: 500;
  letter-spacing: 0.025em;
}

/* Platform Info */
.platform-info {
  background-color: var(--color-background);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  height: fit-content;
}

.platform-info h3 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
}

.platform-description {
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Validation Results */
.validation-results {
  margin-top: var(--spacing-lg);
}

.validation-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.validation-item--success {
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #166534;
}

.validation-item--warning {
  background-color: #fffbeb;
  border: 1px solid #fed7aa;
  color: #92400e;
}

.validation-item--error {
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}

/* Metadata Section */
.metadata-section {
  display: none;
  margin-bottom: var(--spacing-2xl);
}

.metadata-section.visible {
  display: block;
}

.metadata-section h2 {
  margin: 0 0 var(--spacing-lg) 0;
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-text-primary);
}

.metadata-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
  gap: var(--spacing-sm);
}

.metadata-tab {
  background: none;
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
}

.metadata-tab:hover {
  color: var(--color-text-primary);
}

.metadata-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.metadata-display {
  background-color: var(--color-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
}

.metadata-table {
  width: 100%;
  border-collapse: collapse;
}

.metadata-table th,
.metadata-table td {
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.metadata-table th {
  font-weight: 600;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  width: 25%;
}

.metadata-table td {
  color: var(--color-text-secondary);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  font-size: var(--font-size-sm);
  word-break: break-word;
}

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

.export-button,
.clear-cache-button {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  background-color: var(--color-background);
  color: var(--color-text-primary);
}

.export-button:hover,
.clear-cache-button:hover {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
}

/* Footer */
.app-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
  margin-top: auto;
}

.app-footer p {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--color-text-secondary);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .app-title {
    font-size: var(--font-size-2xl);
  }
  
  .app-subtitle {
    font-size: var(--font-size-base);
  }
  
  .input-container {
    flex-direction: column;
  }
  
  
  .social-card {
    max-width: 100%;
  }
  
  .metadata-table th {
    width: 35%;
  }
  
  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: var(--spacing-lg) 0;
  }
  
  .app-main {
    padding: var(--spacing-lg) 0;
  }
  
  .app-title {
    font-size: var(--font-size-xl);
  }
  
  .platform-preview {
    padding: var(--spacing-md);
  }
  
  .platform-info {
    padding: var(--spacing-md);
  }
}

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

/* How to Use Section */
.how-to-use-section {
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
}

.how-to-use-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--color-primary);
  font-size: 2rem;
  font-weight: 700;
}

.instructions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.instruction-step {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
}

.step-content h3 {
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--color-text-primary);
  font-size: 1.25rem;
  font-weight: 600;
}

.step-content p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.step-content code {
  background: var(--color-surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
}

.pro-tips {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.pro-tips h3 {
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--color-text-primary);
  font-size: 1.25rem;
  font-weight: 600;
}

.pro-tips ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.pro-tips li {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.6;
  position: relative;
  padding-left: var(--spacing-lg);
}

.pro-tips li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.pro-tips li:last-child {
  margin-bottom: 0;
}

.pro-tips strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Dark mode support */

/* Focus management for accessibility */
.social-card:focus,
.metadata-tab:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Screen reader only content */
.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;
}