:root {
  --primary-color: #4a90e2;
  --success-color: #52c41a;
  --error-color: #f5222d;
  --warning-color: #faad14;
  --info-color: #1890ff;
  --bg-color: #f5f5f5;
  --panel-bg: #ffffff;
  --border-color: #d9d9d9;
  --text-color: #262626;
  --text-secondary: #8c8c8c;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 2rem 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.header p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 1rem;
}

.header-actions {
  display: flex;
  gap: 1rem;
}

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

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

.spinner {
  width: 60px;
  height: 60px;
  margin: 0 auto 1rem;
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-left-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-detail {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Main Content */
.main-content {
  padding: 2rem 0;
}

/* Toolbar */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--panel-bg);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.toolbar-left,
.toolbar-right {
  display: flex;
  gap: 0.5rem;
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
}

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

.btn-primary:hover {
  background: #3a7bc8;
}

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

.btn-success:hover {
  background: #49b318;
}

.btn-secondary {
  background: #fff;
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #fafafa;
}

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

/* Select */
.select {
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.9rem;
  background: white;
  cursor: pointer;
}

/* Workspace */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

@media (max-width: 1024px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

/* Panel */
.panel {
  background: var(--panel-bg);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  background: #fafafa;
}

.panel-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.panel-info {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Tabs */
.output-tabs {
  display: flex;
  gap: 0.5rem;
}

.tab-btn {
  padding: 0.4rem 0.8rem;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

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

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

.tab-content {
  display: none;
  flex: 1;
  overflow: auto;
}

.tab-content.active {
  display: block;
}

/* Editor */
.editor-container {
  height: 500px;
  border-top: 1px solid var(--border-color);
}

/* Output */
.output-content {
  padding: 1rem;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  height: 500px;
  overflow: auto;
}

.placeholder {
  color: var(--text-secondary);
  text-align: center;
  padding: 2rem;
}

/* Diagnostics */
.diagnostic-item {
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border-left: 4px solid;
  background: #fafafa;
  border-radius: 4px;
}

.diagnostic-item.error {
  border-left-color: var(--error-color);
  background: #fff2f0;
}

.diagnostic-item.warning {
  border-left-color: var(--warning-color);
  background: #fffbe6;
}

.diagnostic-item.convention {
  border-left-color: var(--info-color);
  background: #e6f7ff;
}

.diagnostic-item.info {
  border-left-color: var(--text-secondary);
  background: #f0f0f0;
}

.diagnostic-location {
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.25rem;
}

.diagnostic-message {
  color: var(--text-secondary);
}

.diagnostic-rule {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  background: white;
  border-radius: 3px;
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.no-offenses {
  color: var(--success-color);
  font-weight: 600;
  text-align: center;
  padding: 2rem;
}

/* Rules List */
.rule-item {
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: white;
}

.rule-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.rule-name {
  font-weight: 600;
  color: var(--primary-color);
}

.rule-severity {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8rem;
  font-weight: 500;
}

.rule-severity.error {
  background: #fff2f0;
  color: var(--error-color);
}

.rule-severity.warning {
  background: #fffbe6;
  color: var(--warning-color);
}

.rule-severity.convention {
  background: #e6f7ff;
  color: var(--info-color);
}

.rule-severity.info {
  background: #f0f0f0;
  color: var(--text-secondary);
}

.rule-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Info Panel */
.info-panel {
  background: var(--panel-bg);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.info-panel h3 {
  margin-bottom: 1rem;
}

.info-panel p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.info-panel a {
  color: var(--primary-color);
  text-decoration: none;
}

.info-panel a:hover {
  text-decoration: underline;
}