/**
 * Vibe Web Compare - Production-Ready Styles
 * Modern, responsive, accessible design
 */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--gray-50);
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
header {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 1.5rem 0;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--gray-100);
  color: var(--gray-700);
}

/* Input Section */
.input-section {
  background: white;
  border-radius: var(--border-radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

.input-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--gray-800);
}

.textarea-wrapper {
  position: relative;
  margin-bottom: 1rem;
}

textarea {
  width: 100%;
  min-height: 150px;
  padding: 1rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.2s;
}

textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.char-count {
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  font-size: 0.75rem;
  color: var(--gray-500);
  background: white;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

/* Model Selection */
.model-selection {
  margin-bottom: 1.5rem;
}

.model-selection h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.model-checkboxes {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.checkbox-label:hover {
  border-color: var(--primary);
  background: var(--gray-50);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"]:checked + span {
  font-weight: 600;
  color: var(--primary);
}

.model-info {
  display: flex;
  flex-direction: column;
}

.model-name {
  font-weight: 500;
  color: var(--gray-800);
}

.model-provider {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* Buttons */
.button-group {
  display: flex;
  gap: 1rem;
  align-items: center;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

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

.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-300);
}

/* Loading State */
.loading {
  display: none;
  align-items: center;
  gap: 0.75rem;
  color: var(--gray-600);
  font-size: 0.875rem;
}

.loading.active {
  display: flex;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--gray-300);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Results Section */
.results-section {
  display: none;
}

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

.results-header {
  background: white;
  border-radius: var(--border-radius);
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.results-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 0.75rem;
}

.prompt-echo {
  padding: 1rem;
  background: var(--gray-50);
  border-left: 4px solid var(--primary);
  border-radius: 4px;
  color: var(--gray-700);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.stat-item {
  text-align: center;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
}

/* Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.model-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s;
}

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

.model-card-header {
  padding: 1.25rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

.model-card-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.model-card-header .provider {
  font-size: 0.875rem;
  opacity: 0.9;
}

.model-card-meta {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.75rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.125rem;
}

.meta-value {
  font-weight: 600;
  color: var(--gray-900);
}

.model-card-body {
  padding: 1.25rem;
  flex: 1;
}

.response-text {
  line-height: 1.8;
  color: var(--gray-700);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.error-card {
  border: 2px solid var(--danger);
}

.error-card .model-card-header {
  background: var(--danger);
}

.error-message {
  padding: 1rem;
  background: #fef2f2;
  border-left: 4px solid var(--danger);
  color: #991b1b;
  border-radius: 4px;
}

/* Alert Messages */
.alert {
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-error {
  background: #fef2f2;
  border-left: 4px solid var(--danger);
  color: #991b1b;
}

.alert-success {
  background: #f0fdf4;
  border-left: 4px solid var(--success);
  color: #166534;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .header-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .button-group {
    flex-direction: column;
    width: 100%;
  }

  button {
    width: 100%;
    justify-content: center;
  }

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

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

/* BLEU/ROUGE Similarity Metrics Styles */
.similarity-section {
  background: white;
  border-radius: var(--border-radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  border-left: 4px solid #667eea;
}

.similarity-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.similarity-card {
  background: var(--gray-50);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  border: 1px solid var(--gray-200);
  transition: all 0.3s ease;
}

.similarity-card:hover {
  border-color: #667eea;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.similarity-card.average-card {
  border-left: 4px solid #28a745;
  background: linear-gradient(135deg, #f0fff4 0%, #d1fae5 100%);
}

.metrics-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.metric-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--gray-200);
}

.metric-item:last-child {
  border-bottom: none;
}

.metric-label {
  font-size: 0.9rem;
  color: var(--gray-600);
  font-weight: 500;
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  min-width: 60px;
  text-align: center;
}

.metric-value.excellent {
  background: #d4edda;
  color: #155724;
}

.metric-value.good {
  background: #d1ecf1;
  color: #0c5460;
}

.metric-value.fair {
  background: #fff3cd;
  color: #856404;
}

.metric-value.poor {
  background: #f8d7da;
  color: #721c24;
}

/* Print Styles */
@media print {
  .input-section,
  .button-group {
    display: none;
  }

  .model-card,
  .similarity-card {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}

/* Mobile Responsive for Similarity Metrics */
@media (max-width: 768px) {
  .similarity-grid {
    grid-template-columns: 1fr;
  }

  .similarity-section {
    padding: 1.5rem;
  }
}