:root {
  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-code: "Roboto Mono", "SF Mono", "Consolas", "Menlo", monospace;

  --color-background: #111827;
  --color-panel: #1f2937;
  --color-panel-header: #374151;
  --color-border: #4b5563;
  --color-primary: #38bdf8;
  --color-primary-hover: #7dd3fc;
  --color-secondary: #4b5563;
  --color-secondary-hover: #6b7280;

  --text-light: #f9fafb;
  --text-medium: #d1d5db;
  --text-dark: #9ca3af;

  --status-success: #22c55e;
  --status-error: #ef4444;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.15);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.2), 0 2px 4px -2px rgb(0 0 0 / 0.2);
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

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

.header {
  background: linear-gradient(
    135deg,
    var(--color-panel) 0%,
    var(--color-background) 100%
  );
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 2.5rem;
  text-align: center;
}
.header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}
.header p {
  font-size: 1.1rem;
  color: var(--text-dark);
  max-width: 700px;
  margin: 0 auto;
}

.main-container {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1.5fr;
  gap: 1.5rem;
  padding: 1.5rem;
  flex-grow: 1;
  width: 100%;
  max-width: 1800px;
  margin: 0 auto;
}

.panel {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  padding: 1rem 1.5rem;
  background-color: var(--color-panel-header);
  border-bottom: 1px solid var(--color-border);
}
.panel-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-light);
}

.panel-content {
  padding: 1.5rem;
  overflow-y: auto;
  flex-grow: 1;
}

.input-section {
  padding: 15px;
  margin-bottom: 2rem;
}
.input-section:last-child {
  margin-bottom: 0;
}
.input-section h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-medium);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.file-upload {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  background-color: rgba(75, 85, 99, 0.2);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}
.file-upload:hover,
.file-upload.dragover {
  border-color: var(--color-primary);
  background-color: rgba(56, 189, 248, 0.1);
}
.file-upload-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.file-upload-text .file-icon {
  font-size: 1.5rem;
}
.file-upload-text span {
  color: var(--text-light);
  font-weight: 500;
}
.file-upload-text small {
  color: var(--text-dark);
}

.status-message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
}
.status-message.success {
  background-color: rgba(34, 197, 94, 0.1);
  color: var(--status-success);
  border: 1px solid var(--status-success);
}
.status-message.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--status-error);
  border: 1px solid var(--status-error);
}

#raInput {
  width: 100%;
  min-height: 250px;
  padding: 1rem;
  font-family: var(--font-code);
  font-size: 1rem;
  background-color: var(--color-background);
  color: var(--text-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}
#raInput:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3);
}

.button-group {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}
.btn {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-background);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(56, 189, 248, 0.2);
}
.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--text-light);
}
.btn-secondary:hover {
  background-color: var(--color-secondary-hover);
}

.operator-guide {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
}
.operator {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  font-family: var(--font-code);
  font-size: 1.1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}
.operator:hover {
  background-color: var(--color-secondary-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.operator strong {
  font-size: 1.5rem;
  color: var(--color-primary);
}
.operator small {
  font-family: var(--font-primary);
  font-size: 0.75rem;
  color: var(--text-dark);
}

.examples {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.example {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-family: var(--font-code);
  cursor: pointer;
  transition: all 0.2s ease;
}
.example:hover {
  background-color: var(--color-secondary-hover);
  border-color: var(--color-primary);
}
.output-section h3{
  margin-top: 15px;
  margin-bottom: 10px;
  margin-left: 10px;
}
#sqlOutput {
  background-color: var(--color-background);
  color: var(--text-light);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-code);
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 250px;
  border: 1px solid var(--color-border);
  margin: 10px;
}
.tips-list {
  list-style-type: none;
  padding-left: 0;
  color: var(--text-dark);
}
.tips-list li {
  background-color: rgba(75, 85, 99, 0.2);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}
.tips-list li::before {
  content: "💡";
  margin-right: 0.75rem;
}
.tips-list code {
  font-family: var(--font-code);
  color: var(--color-primary-hover);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

#schemaDisplay {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.table-schema {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
}
.table-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}
.column {
  font-size: 0.9rem;
  font-family: var(--font-code);
  color: var(--text-medium);
  margin-bottom: 0.25rem;
}
.column .type {
  color: var(--text-dark);
}

.footer {
  padding: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-dark);
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

@media (max-width: 1200px) {
  .main-container {
    grid-template-columns: 1fr 2fr;
    grid-template-areas:
      "db input"
      "db output";
  }
  .left-panel {
    grid-area: db;
  }
  .center-panel {
    grid-area: input;
  }
  .right-panel {
    grid-area: output;
  }
}

@media (max-width: 900px) {
  .main-container {
    grid-template-columns: 1fr;
    grid-template-areas:
      "db"
      "input"
      "output";
  }
}