frontend/src/App.css

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#root {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.App {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 20px;
  width: 100%;
  max-width: 1400px;
}

.header-row-1 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.header-row-2 {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.header-selector {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-selector label {
  font-weight: 600;
  color: #374151;
  font-size: 0.9rem;
  white-space: nowrap;
}

.header-selector select {
  padding: 8px 12px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 0.95rem;
  background: white;
  transition: all 0.2s;
  color: #374151;
  font-weight: 500;
  min-width: 120px;
}

.header-selector select:hover {
  border-color: #9ca3af;
}

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

.app-header h1 {
  font-size: 2.2rem;
  margin: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.header-nav {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-button {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
  padding: 0.6rem 1.4rem;
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.nav-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.nav-button.active {
  background: linear-gradient(135deg, #764ba2, #667eea);
  box-shadow: 0 6px 20px rgba(118, 75, 162, 0.4);
}

.nav-link {
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  color: white;
  padding: 0.6rem 1.4rem;
  border-radius: 25px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(238, 90, 36, 0.3);
}

.nav-link:hover {
  background: linear-gradient(135deg, #ee5a24, #ff6b6b);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(238, 90, 36, 0.4);
}

.nav-link.course-link {
  background: linear-gradient(135deg, #10ac84, #00d2d3);
  box-shadow: 0 4px 15px rgba(16, 172, 132, 0.3);
  position: relative;
  overflow: hidden;
}

.nav-link.course-link:hover {
  background: linear-gradient(135deg, #00d2d3, #10ac84);
  box-shadow: 0 6px 20px rgba(16, 172, 132, 0.4);
  transform: translateY(-2px);
}

.nav-link.course-link::before {
  content: '📚';
  margin-right: 0.5rem;
}

.app-header p {
  font-size: 1.1rem;
  color: #64748b;
  font-weight: 400;
}

.main-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  width: 100%;
  max-width: 1400px;
}

@media (max-width: 968px) {
  .main-container {
    grid-template-columns: 1fr;
    max-width: 600px;
  }
}

.input-panel, .result-panel {
  background: white;
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  height: 550px;
  display: flex;
  flex-direction: column;
}

.result-panel {
  overflow-y: auto;
  overflow-x: hidden;
}

/* Custom scrollbar for result panel */
.result-panel::-webkit-scrollbar {
  width: 8px;
}

.result-panel::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

.result-panel::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 4px;
}

.result-panel::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Category Selector Styles */
.category-selector {
  margin-bottom: 20px;
}

.category-selector label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #374151;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.category-select {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 1rem;
  background-color: white;
  transition: all 0.2s;
  color: #374151;
  font-weight: 500;
}

.category-select:hover {
  border-color: #9ca3af;
}

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

.category-select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: #f9fafb;
}

/* Agent Selector Styles */
.agent-selector {
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.agent-selector label {
  font-weight: 600;
  color: #374151;
  font-size: 0.95rem;
  min-width: 100px;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.agent-select {
  flex: 1;
  max-width: 300px;
  padding: 10px 14px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 1rem;
  background: white;
  transition: all 0.2s;
  color: #374151;
  font-weight: 500;
}

.agent-select:hover:not(:disabled) {
  border-color: #9ca3af;
}

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

.agent-select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: #f9fafb;
}

.agent-badge {
  padding: 4px 10px;
  border-radius: 12px;
  color: white;
  font-weight: bold;
  font-size: 0.8rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.text-input {
  margin-bottom: 24px;
}

.text-input textarea {
  width: 100%;
  padding: 14px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 1rem;
  line-height: 1.6;
  resize: vertical;
  min-height: 350px;
  max-height: 400px;
  transition: all 0.2s;
  font-family: inherit;
  color: #1f2937;  /* Darker text color for better visibility */
  background-color: white;
}

.text-input textarea::placeholder {
  color: #9ca3af;
}

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

.text-input textarea:disabled {
  background: #f9fafb;
  cursor: not-allowed;
}

.action-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}

.btn {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 100px;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 6px -1px rgba(102, 126, 234, 0.25);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 15px -3px rgba(102, 126, 234, 0.3);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: #f3f4f6;
  color: #4b5563;
  border: 1px solid #e5e7eb;
}

.btn-secondary:hover:not(:disabled) {
  background: #e5e7eb;
}

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

.error-message {
  padding: 12px 16px;
  background: #fef2f2;
  color: #dc2626;
  border-radius: 8px;
  border-left: 4px solid #dc2626;
  font-weight: 500;
  margin-top: 12px;
  font-size: 0.95rem;
}

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px;
  height: 100%;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid #e5e7eb;
  border-top: 3px solid #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 20px;
}

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

.loading p {
  color: #6b7280;
  font-size: 1rem;
}

.result-container {
  height: 100%;
}

.result-container h2 {
  color: #1f2937;
  margin-bottom: 24px;
  font-size: 1.5rem;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 12px;
}

.result-section {
  margin-bottom: 28px;
}

.result-section h3 {
  color: #374151;
  margin-bottom: 16px;
  font-size: 1.2rem;
  font-weight: 600;
}

.result-section p {
  line-height: 1.8;
  color: #4b5563;
  font-size: 1rem;
}

.summary-content {
  margin-top: 12px;
}

.evaluation-category {
  margin-bottom: 20px;
  padding: 16px;
  background: #f9fafb;
  border-radius: 8px;
  border-left: 3px solid #667eea;
}

.category-title {
  color: #667eea;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.category-content {
  color: #4b5563;
  line-height: 1.7;
  white-space: pre-wrap;
}

.inline-edits {
  padding: 16px;
  background: #f9fafb;
  border-radius: 8px;
  line-height: 1.7;
  color: #374151;
  border: 1px solid #e5e7eb;
}

.inline-edits pre {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: #374151;
}

/* Detailed feedback styles */
.detailed-feedback {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feedback-item {
  padding: 14px;
  background: #f9fafb;
  border-radius: 8px;
  border-left: 3px solid #667eea;
}

.feedback-title {
  color: #667eea;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feedback-content {
  color: #4b5563;
  line-height: 1.7;
  margin: 0;
}

/* Correction item styles */
.suggestions-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.correction-item {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.2s;
}

.correction-item:hover {
  border-color: #9ca3af;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.correction-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 8px 14px;
}

.correction-label {
  color: white;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.correction-content {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.correction-original,
.correction-revised,
.correction-reason {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.correction-original strong,
.correction-revised strong,
.correction-reason strong {
  color: #1f2937;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.correction-original span {
  color: #6b7280;
  line-height: 1.6;
  padding-left: 16px;
}

.correction-revised span {
  line-height: 1.6;
  padding-left: 16px;
}

.corrected-text {
  color: #059669;
  font-weight: 500;
  background: #ecfdf5;
  padding: 6px 10px;
  border-radius: 4px;
  display: inline-block;
}

.correction-reason span {
  color: #6b7280;
  font-style: italic;
  line-height: 1.6;
  padding-left: 16px;
}

.suggestion-item {
  padding: 14px;
  background: #fefce8;
  border-radius: 8px;
  border-left: 3px solid #eab308;
}

.suggestion-item strong {
  color: #a16207;
  margin-right: 8px;
}

/* Score table styles */
.score-table {
  margin-top: 20px;
  overflow-x: auto;
}

.score-table table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
}

.score-table th {
  background: #f9fafb;
  color: #374151;
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  border-bottom: 2px solid #e5e7eb;
}

.score-table td {
  padding: 14px 16px;
  border-bottom: 1px solid #f3f4f6;
  color: #374151;
  font-size: 0.95rem;
}

.score-table tr:last-child td {
  border-bottom: none;
}

.score-table tr:hover:not(.overall-row) {
  background: #fafbfc;
}

.criteria-name {
  font-weight: 600;
  color: #4b5563;
  min-width: 120px;
}

.criteria-grade {
  font-weight: bold;
  font-size: 1.2rem;
  color: #667eea;
  text-align: center;
  min-width: 80px;
}

.criteria-explanation {
  color: #6b7280;
  line-height: 1.6;
}

.overall-row {
  background: #f9fafb;
  font-weight: bold;
}

.overall-row td {
  padding: 16px;
  border-top: 2px solid #667eea;
}

.overall-emoji {
  font-size: 1.5rem;
  margin-right: 8px;
  vertical-align: middle;
}

.overall-score-number {
  font-size: 1.1rem;
  color: #1f2937;
  font-weight: bold;
  vertical-align: middle;
}