/* CSS Custom Properties (Light Theme) */
:root {
  /* Colors - Light Theme */
  --primary-color: #1d61b9;
  --primary-dark: #0a2264;
  --primary-light: #5779af;
  
  --secondary-color: #64748b;
  --secondary-dark: #475569;
  --secondary-light: #94a3b8;
  
  --success-color: #059669;
  --warning-color: #d97706;
  --error-color: #dc2626;
  
  --background-color: #ffffff;
  --background-secondary: #f8fafc;
  --background-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --shadow-color: rgba(15, 23, 42, 0.1);
  --shadow-hover: rgba(15, 23, 42, 0.15);
  
  /* 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: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --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;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* Header */
.header {
  background: var(--background-color);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
/* Textual logo block for NineRiver */
.logo-block {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-md);
}
.logo-block .logo {
  font-family: 'Rubik', sans-serif;
  font-weight: 500;
  font-size: var(--font-size-3xl);
  color: var(--primary-color);
  margin: 0;
  line-height: 1;
}
.logo-block .title {
  font-family: 'Rubik', sans-serif;
  font-weight: 500;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  margin: 0;
  line-height: 1;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  height: 40px;
  width: auto;
}

.logo-text {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

/* Status Indicator */
.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success-color);
  animation: pulse 2s infinite;
}

.status-dot.scanning {
  background: var(--warning-color);
}

.status-dot.error {
  background: var(--error-color);
  animation: none;
}

/* Status spinner for refreshing state */
.status-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

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

.btn-secondary:hover {
  background: var(--background-tertiary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow-color);
}

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

.btn-icon {
  font-size: var(--font-size-base);
}

/* Floating Refresh Button */
.floating-refresh-btn {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  border: none;
  box-shadow: 0 4px 12px var(--shadow-hover);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all var(--transition-normal);
  z-index: 50;
}

.floating-refresh-btn:hover {
  background: var(--primary-dark);
  transform: scale(1.1) rotate(15deg);
  box-shadow: 0 6px 20px var(--shadow-hover);
}

.floating-refresh-btn:active {
  transform: scale(0.95) rotate(-15deg);
}

.floating-refresh-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

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

/* Loading Screen */
.loading-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  text-align: center;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.spinner {
  width: 64px;
  height: 64px;
  border: 4px solid var(--background-tertiary);
  border-left: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.spinner.small {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.loading-subtext {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* Error Screen */
.error-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  text-align: center;
}

.error-content {
  max-width: 400px;
}

.error-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.error-content h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.error-content p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

/* Gallery */
.gallery-container {
  animation: fadeIn 0.5s ease;
}

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

.gallery-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.gallery-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.gallery-subtitle {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

/* Case Study Cards */
.case-study-card {
  background: var(--background-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 3px var(--shadow-color);
  aspect-ratio: 4 / 5;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: var(--spacing-md);
}

.case-study-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px var(--shadow-hover);
  border-color: var(--border-hover);
}

.card-content {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  margin-top: auto;
}

.card-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
}

.card-meta {
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-sm);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.empty-state p {
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-base);
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--background-color);
  border-radius: var(--radius-xl);
  max-width: 800px;
  max-height: 90vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  line-height: 1;
}

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

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
}

.modal-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-secondary);
}

.modal-text {
  line-height: 1.7;
  color: var(--text-primary);
}

.modal-text h1, .modal-text h2, .modal-text h3, .modal-text h4, .modal-text h5, .modal-text h6 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.modal-text h1:first-child,
.modal-text h2:first-child,
.modal-text h3:first-child,
.modal-text h4:first-child,
.modal-text h5:first-child,
.modal-text h6:first-child {
  margin-top: 0;
}

.modal-text p {
  margin-bottom: var(--spacing-md);
}

.modal-text ul, .modal-text ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

.modal-text li {
  margin-bottom: var(--spacing-xs);
}

.modal-text code {
  background: var(--background-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9em;
}

.modal-text pre {
  background: var(--background-secondary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--border-color);
}

.modal-text pre code {
  background: none;
  padding: 0;
}

.modal-text blockquote {
  border-left: 4px solid var(--primary-color);
  background: var(--background-secondary);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.modal-error {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--error-color);
}

/* Footer */
.footer {
  background: var(--background-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

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

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

/* Utility Classes */
.hidden {
  display: none !important;
}

.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;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header {
    padding: var(--spacing-sm) 0;
  }
  
  .header .container {
    gap: var(--spacing-sm);
  }
  
  .logo-block {
    gap: var(--spacing-sm);
  }
  
  .logo-block .logo {
    font-size: var(--font-size-2xl);
  }
  
  .logo-block .title {
    font-size: var(--font-size-base);
  }
  
  .header-actions {
    width: auto;
    justify-content: flex-end;
  }
  
  .floating-refresh-btn {
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
  }
  
  .gallery-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .modal {
    padding: var(--spacing-md);
  }
  
  .modal-content {
    max-height: 95vh;
  }
  
  .modal-header, .modal-body {
    padding: var(--spacing-lg);
  }
  
  .gallery-title {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-xs);
  }
  
  .header {
    padding: var(--spacing-xs) 0;
  }
  
  .logo-block .logo {
    font-size: var(--font-size-xl);
  }
  
  .logo-block .title {
    font-size: var(--font-size-sm);
  }
  
  .floating-refresh-btn {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
  }
  
  .case-study-card {
    margin: 0 -var(--spacing-sm);
  }
  
  .card-image {
    height: 160px;
  }
  
  .btn {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}