:root {
  /* Color palette */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #f1f3f5;
  --color-text: #212529;
  --color-text-secondary: #495057;
  --color-text-tertiary: #868e96;
  --color-border: #dee2e6;
  --color-border-light: #e9ecef;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: #dbeafe;
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-error: #ef4444;
  --color-error-light: #fee2e2;
  --color-code-bg: #f8f9fa;
  --color-code-text: #212529;
  --color-stage-number: #e9ecef;
  --color-stage-number-text: #495057;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans",
    "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", Courier, monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
}

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

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1.125rem;
}

p {
  margin-bottom: var(--space-4);
}

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

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

pre,
code {
  font-family: var(--font-mono);
}

code {
  background-color: var(--color-bg-tertiary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

button {
  cursor: pointer;
  font-family: var(--font-sans);
}

/* Layout */
.app-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-4);
  width: 100%;
  flex: 1;
}

.app-header {
  padding: var(--space-6) 0;
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.app-header h1 {
  margin-bottom: var(--space-2);
}

.app-header p {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.app-footer {
  text-align: center;
  padding: var(--space-6);
  margin-top: var(--space-8);
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.social-links {
  display: flex;
  gap: var(--space-4);
}

.social-links a {
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.social-links a:hover {
  color: var(--color-primary);
}

/* Tabs */
.app-tabs {
  display: flex;
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-2);
}

.tab-button {
  background: none;
  border: none;
  padding: var(--space-4) var(--space-6);
  font-size: 1rem;
  color: var(--color-text-secondary);
  border-bottom: 3px solid transparent;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tab-button:hover {
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
}

.tab-button.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 500;
}

.tab-button svg {
  opacity: 0.7;
}

.tab-button.active svg {
  opacity: 1;
}

.tab-content {
  display: none;
}

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

/* Workspace layout */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  height: calc(100vh - 250px);
  min-height: 600px;
}

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

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.panel-header h2 {
  margin-bottom: 0;
  font-size: 1.25rem;
}

.panel-actions {
  display: flex;
  gap: var(--space-2);
}

/* Editor */
.editor-container {
  flex: 1;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.CodeMirror {
  height: 100% !important;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}

.input-section {
  padding: var(--space-4) var(--space-6);
  background-color: var(--color-bg-secondary);
}

.input-section h3 {
  margin-bottom: var(--space-2);
  font-size: 1rem;
}

.input-hint {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  margin-bottom: var(--space-2);
}

#inputData {
  width: 100%;
  height: 100px;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  resize: vertical;
  background-color: var(--color-bg);
  transition: border-color var(--transition-fast);
}

#inputData:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

/* Compilation stages */
.compilation-panel {
  overflow: hidden;
}

.compilation-stages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.stage {
  margin-bottom: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.stage:hover {
  box-shadow: var(--shadow-sm);
}

.stage-header {
  background-color: var(--color-bg-secondary);
  padding: var(--space-4) var(--space-6);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.stage-header:hover {
  background-color: var(--color-bg-tertiary);
}

.stage-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.stage-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--color-stage-number);
  color: var(--color-stage-number-text);
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 600;
}

.stage-title h3 {
  margin-bottom: 0;
  font-size: 1rem;
}

.stage-toggle {
  transition: transform var(--transition-fast);
}

.stage-toggle .icon-chevron {
  transition: transform var(--transition-normal);
}

.stage.collapsed .stage-toggle .icon-chevron {
  transform: rotate(-90deg);
}

.stage-content {
  padding: var(--space-4) var(--space-6);
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border-light);
  max-height: 400px;
  overflow-y: auto;
  transition: max-height var(--transition-normal), opacity var(--transition-normal);
}

.stage.collapsed .stage-content {
  max-height: 0;
  padding: 0 var(--space-6);
  overflow: hidden;
  border-top: none;
  opacity: 0;
}

.stage-description {
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg-secondary);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.stage-description p {
  margin-bottom: 0;
}

.code-output {
  background-color: var(--color-code-bg);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  color: var(--color-code-text);
}

.error-output {
  background-color: var(--color-error-light);
  color: var(--color-error);
  border-color: var(--color-error);
}

/* Optimization log */
.optimization-log {
  background-color: var(--color-success-light);
  border: 1px solid var(--color-success);
  color: var(--color-success);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* Execution Results */
.execution-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.execution-metric {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.execution-metric svg {
  color: var(--color-primary);
}

.output-section,
.error-section {
  margin-bottom: var(--space-4);
}

.output-section h4,
.error-section h4 {
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.error-section {
  display: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
}

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

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

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

.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
}

.btn-text {
  background: none;
  color: var(--color-text-secondary);
  padding: var(--space-1) var(--space-2);
}

.btn-text:hover {
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
}

/* Status indicators */
.success {
  color: var(--color-success) !important;
}

.error {
  color: var(--color-error) !important;
}

.info {
  color: var(--color-primary) !important;
}

.warning {
  color: var(--color-warning) !important;
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-bg);
  border-top: 2px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Documentation styles */
.documentation-container {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

.doc-sidebar {
  position: sticky;
  top: var(--space-6);
  height: fit-content;
}

.doc-nav {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.doc-nav h3 {
  font-size: 1rem;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-light);
}

.doc-nav ul {
  list-style: none;
}

.doc-nav li {
  margin-bottom: var(--space-1);
}

.doc-nav a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.doc-nav a:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

.doc-nav a.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 500;
}

.doc-content {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.doc-section {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
}

.doc-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.doc-section h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-light);
}

.doc-section h3 {
  font-size: 1.25rem;
  margin-top: var(--space-6);
  margin-bottom: var(--space-4);
}

.code-example {
  margin-bottom: var(--space-6);
}

.code-block {
  background-color: var(--color-code-bg);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  margin-bottom: 0;
}

.code-example .code-output {
  background-color: var(--color-bg-tertiary);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  padding: var(--space-4);
}

.code-example .code-output h4 {
  margin-bottom: var(--space-2);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
}

.code-example .code-output pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.simple-list {
  list-style: none;
  margin-bottom: var(--space-6);
  padding-left: var(--space-4);
}

.simple-list li {
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.feature-list {
  list-style: none;
  margin-bottom: var(--space-6);
  padding-left: var(--space-4);
}

.feature-list li {
  margin-bottom: var(--space-3);
  position: relative;
  padding-left: var(--space-4);
}

.feature-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* Responsive styles */
@media (max-width: 1200px) {
  .workspace {
    grid-template-columns: 1fr;
    height: auto;
  }

  .editor-panel,
  .compilation-panel {
    height: 600px;
  }
}

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

  .doc-sidebar {
    position: static;
  }

  .app-tabs {
    overflow-x: auto;
    padding-bottom: var(--space-2);
  }

  .tab-button {
    padding: var(--space-3) var(--space-4);
    white-space: nowrap;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .panel-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .execution-info {
    flex-direction: column;
    gap: var(--space-2);
  }
}

@media (max-width: 480px) {
  .app-container {
    padding: var(--space-2);
  }

  .feature-list {
    padding-left: var(--space-2);
  }
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}