/* Layout and Responsive Grid */

:root {
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --border-radius: 8px;
  --border-radius-sm: 4px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--color-bg);
  color: var(--color-text);
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

header nav {
  display: flex;
  gap: var(--spacing-md);
}

header nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  transition: background 0.2s;
}

header nav a:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Main Playground Layout */
.playground {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
  overflow: hidden;
}

/* Input Panel */
.input-panel {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  min-height: 0;
}

.editor-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  flex: 1;
  min-height: 0;
}

.editor-container label {
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.config-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  flex: 0 0 auto;
}

.config-container h3 {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.config-presets {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

/* Output Panel */
.output-panel {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  min-height: 0;
  position: relative;
}

.tabs {
  display: flex;
  gap: var(--spacing-xs);
  border-bottom: 2px solid var(--color-border);
}

.tab-content {
  display: none;
  flex-direction: column;
  gap: var(--spacing-sm);
  flex: 1;
  min-height: 0;
  overflow: auto;
}

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

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
}

.output-header h4 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.output-code {
  flex: 1;
  margin: 0;
  overflow: auto;
  min-height: 0;
}

/* Info Content */
.info-content {
  padding: var(--spacing-md);
  overflow: auto;
}

.info-content h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.info-content h4 {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.info-content p {
  margin: var(--spacing-xs) 0;
}

.info-list {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-md);
}

.info-list li {
  margin: var(--spacing-xs) 0;
}

.info-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

/* Error Container */
.error-container {
  position: absolute;
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 50;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-radius: var(--border-radius);
  overflow: hidden;
  animation: slideUp 0.3s ease-out;
}

.error-container.hidden {
  display: none;
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.error-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
}

.error-message {
  margin: 0;
  padding: var(--spacing-md);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.error-details {
  padding: 0 var(--spacing-md) var(--spacing-md);
}

/* Footer */
footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: center;
}

footer p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

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

footer a:hover {
  text-decoration: underline;
}

/* Responsive Breakpoints */

/* Tablet */
@media (max-width: 1024px) {
  .playground {
    gap: var(--spacing-md);
    padding: var(--spacing-md);
  }

  header h1 {
    font-size: 1.25rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .playground {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  header h1 {
    font-size: 1.125rem;
  }

  header nav {
    width: 100%;
    justify-content: space-between;
  }

  .config-presets {
    justify-content: stretch;
  }

  .preset-btn {
    flex: 1;
    min-width: 0;
  }

  .error-container {
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    bottom: var(--spacing-sm);
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  header {
    padding: var(--spacing-sm);
  }

  .playground {
    padding: var(--spacing-xs);
  }

  .tabs {
    overflow-x: auto;
  }

  .info-content {
    padding: var(--spacing-sm);
  }
}