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

.App {
  text-align: center;
}

.App-logo {
  height: 40vmin;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  .App-logo {
    animation: App-logo-spin infinite 20s linear;
  }
}

.App-header {
  background-color: #282c34;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  color: white;
  text-align: center;
  padding: 2rem 1rem;
  color: white;
  background: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
}

.App-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.App-header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

.App-link {
  color: #61dafb;
}

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

/* Progress Steps */
.progress-container {
  padding: 2rem 1rem;
  display: flex;
  justify-content: center;
}

.progress-steps {
  display: flex;
  align-items: center;
  gap: 2rem;
  background: white;
  padding: 1rem 2rem;
  border-radius: 50px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0.5;
  transition: all 0.3s ease;
}

.step.active {
  opacity: 1;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #e0e0e0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  transition: all 0.3s ease;
}

.step.active .step-number {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
}

.step-label {
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.content-section {
  background: white;
  border-radius: 15px;
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.5rem;
  overflow: hidden;
  transition: all 0.3s ease;
}

.content-section.collapsed {
  background: rgba(255, 255, 255, 0.7);
}

.section-header {
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, #f8f9ff, #e8ecff);
  border-bottom: 1px solid #e0e0e0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.section-header:hover {
  background: linear-gradient(135deg, #f0f4ff, #dde4ff);
}

.section-header h2 {
  font-size: 1.3rem;
  color: #333;
  font-weight: 600;
}

.toggle-icon {
  font-size: 1.2rem;
  color: #666;
  transition: transform 0.3s ease;
}

.section-content {
  padding: 2rem;
}

.content-section.collapsed .section-content {
  display: none;
}

/* Puzzle Selection */
.puzzle-selector {
  margin-bottom: 2rem;
}

.puzzle-selector label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #555;
}

.input-group {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.number-input {
  padding: 0.75rem 1rem;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 1rem;
  width: 150px;
  transition: border-color 0.3s ease;
}

.number-input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.puzzle-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 768px) {
  .puzzle-display {
    grid-template-columns: 1fr;
  }
}

.puzzle-text, .expected-solution {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 1.5rem;
}

.puzzle-text h3, .expected-solution h3 {
  margin-bottom: 1rem;
  color: #333;
  font-size: 1.1rem;
}

.text-display, .json-display {
  background: white;
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid #e0e0e0;
  white-space: pre-wrap;
  max-height: 300px;
  overflow-y: auto;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* System Configuration */
.sys-content-editor h3 {
  margin-bottom: 0.5rem;
  color: #333;
}

.description {
  margin-bottom: 1rem;
  color: #666;
  line-height: 1.6;
}

.sys-content-textarea {
  width: 100%;
  min-height: 300px;
  padding: 1rem;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.3s ease;
}

.sys-content-textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

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

.btn-primary {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: #6c757d;
  color: white;
}

.btn-secondary:hover:not(:disabled) {
  background: #5a6268;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: #667eea;
  border: 2px solid #667eea;
}

.btn-outline:hover:not(:disabled) {
  background: #667eea;
  color: white;
}

.solve-btn {
  font-size: 1.1rem;
  padding: 1rem 2rem;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  display: flex;
}

.solve-btn.loading {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Results */
.solve-section {
  text-align: center;
  margin-bottom: 2rem;
}

.result-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.result-item {
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-label {
  font-weight: 500;
  color: #555;
}

.result-value {
  font-weight: 600;
}

.result-value.success {
  color: #28a745;
}

.result-value.error {
  color: #dc3545;
}

.result-value.pending {
  color: #ffc107;
}

.issues-section, .code-section {
  margin-top: 2rem;
}

.issues-section h3, .code-section h3 {
  margin-bottom: 1rem;
  color: #333;
}

.issues-display, .code-display {
  background: #f8f9fa;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 1rem;
  max-height: 400px;
  overflow-y: auto;
}

.code-display {
  background: #282c34;
  color: #abb2bf;
}

.code-display pre {
  margin: 0;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* Navigation */
.navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.step-indicator {
  color: white;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  backdrop-filter: blur(10px);
}

/* Page Navigation */
.page-navigation {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  justify-content: center;
}

.nav-tab {
  padding: 0.75rem 2rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.nav-tab:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

.nav-tab.active {
  background: white;
  color: #667eea;
  border-color: white;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Custom Puzzle Page */
.custom-puzzle-editor h3 {
  margin-bottom: 0.5rem;
  color: #333;
}

.puzzle-input-container {
  margin-bottom: 2rem;
}

.custom-puzzle-textarea {
  width: 100%;
  min-height: 400px;
  padding: 1rem;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.3s ease;
}

.custom-puzzle-textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.puzzle-examples {
  background: #f8f9ff;
  border-radius: 8px;
  padding: 1.5rem;
  border-left: 4px solid #667eea;
}

.puzzle-examples h4 {
  margin-bottom: 1rem;
  color: #333;
}

.puzzle-examples ul {
  margin-left: 1.5rem;
  color: #555;
  line-height: 1.6;
}

.puzzle-examples li {
  margin-bottom: 0.5rem;
}

/* Solution Navigator */
.solution-navigator {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.solution-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.solution-header h3 {
  margin: 0;
  color: #333;
}

.solution-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.solution-pagination {
  display: flex;
  gap: 0.25rem;
}

.pagination-btn {
  width: 35px;
  height: 35px;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: white;
  color: #666;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.pagination-btn:hover {
  background: #f0f0f0;
}

.pagination-btn.active {
  background: #667eea;
  color: white;
  border-color: #667eea;
}

.solution-display {
  background: white;
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid #e0e0e0;
}

.solution-info {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #eee;
}

.solution-counter {
  color: #666;
  font-weight: 500;
}

.solution-table-container {
  overflow-x: auto;
}

.solution-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.solution-table th,
.solution-table td {
  padding: 0.75rem;
  text-align: left;
  border: 1px solid #ddd;
}

.solution-table th {
  background: #f8f9fa;
  font-weight: 600;
  color: #333;
}

.solution-table tr:nth-child(even) {
  background: #f9f9f9;
}

.solution-table tr:hover {
  background: #f0f4ff;
}

.solution-json {
  background: #f8f9fa;
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
}

.solution-json pre {
  margin: 0;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.4;
}

/* Error Section */
.error-section {
  margin-top: 2rem;
}

.error-section h3 {
  margin-bottom: 1rem;
  color: #dc3545;
}

.error-display {
  background: #fff5f5;
  border: 1px solid #fed7d7;
  border-radius: 8px;
  padding: 1rem;
  max-height: 300px;
  overflow-y: auto;
}

.error-display pre {
  margin: 0;
  color: #c53030;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

.result-value.warning {
  color: #f56500;
}

/* Responsive Design */
@media (max-width: 768px) {
  .app-header h1 {
    font-size: 2rem;
  }
  
  .progress-steps {
    flex-direction: column;
    gap: 1rem;
  }
  
  .step {
    flex-direction: row;
    gap: 1rem;
  }
  
  .section-content {
    padding: 1rem;
  }
  
  .input-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .navigation {
    flex-direction: column;
    gap: 1rem;
  }
  
  .page-navigation {
    flex-direction: column;
    align-items: center;
  }
  
  .nav-tab {
    width: 200px;
    text-align: center;
  }
  
  .solution-header {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }
  
  .solution-controls {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .solution-pagination {
    max-width: 100%;
    overflow-x: auto;
    padding: 0.5rem 0;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 0 0.5rem 1rem;
  }
  
  .section-header {
    padding: 1rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  
  .custom-puzzle-textarea {
    min-height: 300px;
    font-size: 0.8rem;
  }
  
  .solution-table {
    font-size: 0.8rem;
  }
  
  .solution-table th,
  .solution-table td {
    padding: 0.5rem;
  }
}