/* Modern CSS Variables with Enhanced Color Palette */
/* =====================================================
   BASE THEME (LIGHT) — DEFAULT
   ===================================================== */
:root {
  /* Primary colors */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #c7d2fe;
  --primary-bg: #eef2ff;
  
  /* Secondary colors */
  --secondary: #f59e0b;
  --secondary-hover: #d97706;
  --secondary-light: #fef3c7;
  
  /* Neutral colors */
  --background: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --border: #e2e8f0;
  --border-dark: #cbd5e1;
  
  /* Functional colors */
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  
  /* Typography */
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Consolas', 'Courier New', monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 6px 12px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.16);
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);

  color-scheme: light;
}

/* =====================================================
   DARK THEME — AUTO (SYSTEM PREFERENCE)
   ===================================================== */
@media (prefers-color-scheme: dark) {
  :root {
    /* Primary colors */
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --primary-light: #312e81;
    --primary-bg: #1e1b4b;
    
    /* Secondary colors */
    --secondary: #fbbf24;
    --secondary-hover: #f59e0b;
    --secondary-light: #78350f;
    
    /* Neutral colors */
    --background: #020617;
    --card: #020617;
    --text: #e5e7eb;
    --text-light: #9ca3af;
    --text-lighter: #6b7280;
    --border: #1e293b;
    --border-dark: #334155;
    
    /* Functional colors */
    --success: #34d399;
    --error: #f87171;
    --warning: #fbbf24;
    --info: #60a5fa;
    
    /* Shadows (subtle in dark mode) */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.7);

    color-scheme: dark;
  }
}

/* =====================================================
   GLOBAL STYLES
   ===================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--background);
  color: var(--text);
  transition: background-color var(--transition),
              color var(--transition);
}


/* Container & Layout */
.container {
  max-width: 1400px;
  margin: 0 auto;
  /* padding: 0 var(--space-4); */
}

/* Header Styles */
header {
  text-align: center;
  margin-bottom: var(--space-8);
  animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.025em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  font-weight: 500;
  margin-bottom: var(--space-6);
}

/* Playground Layout */
.playground {
  display: flex;
  flex-direction: row;
  gap: var(--space-6);
}

@media (max-width: 1024px) {
  .playground {
    flex-direction: column;
  }
}

/* Card Styles */
.card {
  width: 100%;
  background-color: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  height: fit-content;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--border);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-6);
}

label {
  display: block;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-2);
  font-size: 0.95rem;
}

input, select, textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background-color: var(--card);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

input::placeholder, textarea::placeholder {
  color: var(--text-lighter);
}

/* Rich Text Editor */
.rich-text-editor {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 120px;
  padding: var(--space-4);
  margin-bottom: var(--space-2);
  background-color: var(--card);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.rich-text-editor:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.rich-text-editor:empty:before {
  content: attr(placeholder);
  color: var(--text-lighter);
  pointer-events: none;
}

/* Fix for bullet points */
.rich-text-editor ul {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

.rich-text-editor li {
  margin-bottom: 0.25rem;
}

/* Toolbar */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--primary-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.toolbar button {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  transition: all var(--transition);
}

.toolbar button:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary-hover);
}

.icon {
  font-weight: bold;
  font-size: 1rem;
}

/* Code Editor */
.code-editor {
  width: 100%;
  height: 200px;
  font-family: var(--font-mono);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
  resize: vertical;
  line-height: 1.5;
}

.code-editor:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Language Options */
.language-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin: var(--space-3) 0;
}

.language-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.language-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--primary);
}

.language-checkbox label {
  margin-bottom: 0;
  font-weight: 500;
  cursor: pointer;
}

/* Code Sections & Tabs */
.code-sections {
  margin-top: var(--space-4);
}

.code-section {
  margin-bottom: var(--space-4);
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.code-section.active {
  display: block;
}

.lang-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.lang-tab {
  padding: var(--space-2) var(--space-4);
  background-color: var(--primary-bg);
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 500;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.lang-tab:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-light);
}

.lang-tab.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary-hover);
}

/* Buttons */
.generate-btn {
  display: block;
  width: 100%;
  padding: var(--space-4);
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
  margin-top: var(--space-6);
  box-shadow: var(--shadow);
}

.generate-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.generate-btn:active {
  transform: translateY(0);
}

/* Output Section */
.output {
  display: none;
}

.output.active {
  display: block;
  animation: fadeIn 0.5s ease-out;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.output-header h2 {
  font-size: 1.5rem;
  color: var(--primary);
}

.output-content {
  width: 100%;
  height: 400px;
  font-family: var(--font-mono);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  resize: vertical;
  line-height: 1.5;
}

.copy-btn, .download-btn {
  padding: var(--space-2) var(--space-4);
  background-color: var(--secondary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
  margin-left: var(--space-2);
  box-shadow: var(--shadow-sm);
}

.copy-btn:hover, .download-btn:hover {
  background-color: var(--secondary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.button-group {
  display: flex;
  justify-content: flex-end;
}

.difficulty-select {
  width: 100%;
  padding: 10px;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  outline: none;
}

.difficulty-select:focus {
  border-color: #007bff;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Optional: Add colors to the dropdown options */
.difficulty-select option[value="Easy"] {
  color: #28a745;
  font-weight: 500;
}

.difficulty-select option[value="Medium"] {
  color: #ffc107;
  font-weight: 500;
}

.difficulty-select option[value="Hard"] {
  color: #dc3545;
  font-weight: 500;
}

/* Footer */
footer {
  text-align: center;
  margin-top: var(--space-8);
  padding: var(--space-4) 0;
  color: var(--text-light);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  h1 {
    font-size: 1.6rem;
  }
  
  .subtitle {
    font-size: 0.97rem;
  }
  
  .playground {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: var(--space-4);
  }
  
  .language-options {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .toolbar {
    gap: var(--space-1);
    padding: var(--space-2);
  }
  
  .toolbar button {
    padding: var(--space-1) var(--space-2);
    font-size: 0.8rem;
  }
}