/* Theme Variables & Font Configuration */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Light Mode Color Palette (Indigo & Slate) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: #e0e7ff;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(226, 232, 240, 0.8);

  /* Mindmap Light Mode Pastel Colors */
  --map-node-r-bg: #e0e7ff; /* Root (Pastel Indigo) */
  --map-node-r-text: #1e1b4b;
  --map-node-r-border: #c7d2fe;
  
  --map-node-1-bg: #e0f2fe; /* Branch Lvl 1 (Pastel Sky) */
  --map-node-1-text: #0c4a6e;
  --map-node-1-border: #bae6fd;
  
  --map-node-2-bg: #ffe4e6; /* Leaf Lvl 2 (Pastel Rose) */
  --map-node-2-text: #881337;
  --map-node-2-border: #fecdd3;
  
  --map-node-s-bg: #d1fae5; /* Studied/Complete (Pastel Emerald) */
  --map-node-s-text: #064e3b;
  --map-node-s-border: #a7f3d0;
  
  --map-edge-color: #cbd5e1;
}

:root.dark {
  /* Dark Mode Color Palette (Slate, Zinc & Indigo) */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #374151;
  --accent-color: #818cf8;
  --accent-hover: #6366f1;
  --accent-light: #312e81;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  --glass-bg: rgba(17, 24, 39, 0.7);
  --glass-border: rgba(55, 65, 81, 0.8);

  /* Mindmap Dark Mode Pastel Colors */
  --map-node-r-bg: #1e1b4b; /* Root */
  --map-node-r-text: #e0e7ff;
  --map-node-r-border: #312e81;
  
  --map-node-1-bg: #0c4a6e; /* Branch Lvl 1 */
  --map-node-1-text: #e0f2fe;
  --map-node-1-border: #0369a1;
  
  --map-node-2-bg: #881337; /* Leaf Lvl 2 */
  --map-node-2-text: #ffe4e6;
  --map-node-2-border: #9f1239;
  
  --map-node-s-bg: #064e3b; /* Studied */
  --map-node-s-text: #a7f3d0;
  --map-node-s-border: #047857;
  
  --map-edge-color: #374151;
}

/* Global Resets */
body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Glassmorphism Classes */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
}

/* Custom Markdown Rendering Styling */
.markdown-body {
  font-size: 0.975rem;
  line-height: 1.625;
  color: var(--text-secondary);
}

.markdown-body h1, 
.markdown-body h2, 
.markdown-body h3, 
.markdown-body h4 {
  color: var(--text-primary);
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.markdown-body h1 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.25rem; }
.markdown-body h3 { font-size: 1.125rem; }
.markdown-body h4 { font-size: 1rem; }

.markdown-body p {
  margin-top: 0;
  margin-bottom: 1em;
}

.markdown-body ul, 
.markdown-body ol {
  margin-top: 0;
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.markdown-body ul {
  list-style-type: disc;
}

.markdown-body ol {
  list-style-type: decimal;
}

.markdown-body li {
  margin-top: 0.25em;
  margin-bottom: 0.25em;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--bg-tertiary);
  color: var(--accent-color);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

.markdown-body pre {
  margin-top: 0;
  margin-bottom: 1em;
  padding: 1rem;
  overflow: auto;
  font-size: 0.9rem;
  line-height: 1.45;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  position: relative;
}

.markdown-body pre code {
  background-color: transparent;
  padding: 0;
  color: var(--text-primary);
  font-size: inherit;
  border-radius: 0;
  border: 0;
  display: block;
}

.markdown-body blockquote {
  margin: 0 0 1rem 0;
  padding: 0.5rem 1rem;
  color: var(--text-muted);
  border-left: 4px solid var(--accent-color);
  background-color: var(--bg-tertiary);
  border-radius: 0 4px 4px 0;
}

.markdown-body table {
  width: 100%;
  margin-bottom: 1rem;
  border-collapse: collapse;
}

.markdown-body th, 
.markdown-body td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border-color);
}

.markdown-body th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
  text-align: left;
}

.markdown-body tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.02);
}
.dark .markdown-body tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.02);
}

.markdown-body a {
  color: var(--accent-color);
  text-decoration: none;
}
.markdown-body a:hover {
  text-decoration: underline;
}

/* KaTeX Formatting Adjustments */
.katex-display {
  padding: 0.75rem;
  margin: 1rem 0;
  background: var(--bg-tertiary);
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
}

/* Shimmer Loading Animation */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.skeleton-text {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--border-color) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}

/* Custom Modal Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.animate-fade-in {
  animation: fadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Camera Video Mirroring */
.video-preview {
  transform: scaleX(-1);
}

/* Suggestion Card Hover Accent */
.suggestion-card:hover {
  border-color: var(--accent-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.suggestion-card {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -------------------------------------------------------------
   MINDMAP VISUAL DIAGRAM STYLES
   ------------------------------------------------------------- */
.mindmap-node {
  position: absolute;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 2px solid transparent;
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.35;
  width: 220px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  user-select: none;
}

/* Node level styling with pastel colors */
.mindmap-node.level-0 {
  background-color: var(--map-node-r-bg);
  color: var(--map-node-r-text);
  border-color: var(--map-node-r-border);
  font-size: 0.9rem;
  width: 240px;
}

.mindmap-node.level-1 {
  background-color: var(--map-node-1-bg);
  color: var(--map-node-1-text);
  border-color: var(--map-node-1-border);
}

.mindmap-node.level-2 {
  background-color: var(--map-node-2-bg);
  color: var(--map-node-2-text);
  border-color: var(--map-node-2-border);
}

/* Studied/Completed color overrides (Emerald theme) */
.mindmap-node.studied {
  background-color: var(--map-node-s-bg) !important;
  color: var(--map-node-s-text) !important;
  border-color: var(--map-node-s-border) !important;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.15);
}

/* Hover effects */
.mindmap-node:hover {
  transform: translateY(-2.5px) scale(1.03);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.mindmap-node.studied:hover {
  border-color: #10b981;
}

/* Visual Connector SVG Lines (edges) */
.mindmap-edge {
  fill: none;
  stroke: var(--map-edge-color);
  stroke-width: 1.5;
  transition: stroke 0.3s ease;
}

.mindmap-edge.studied {
  stroke: #10b981;
  stroke-width: 2.25;
}

/* Floating custom Tooltip inside Mindmap container */
.mindmap-tooltip {
  position: absolute;
  padding: 0.6rem 0.8rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 8px;
  font-size: 0.725rem;
  max-width: 250px;
  line-height: 1.4;
  box-shadow: var(--shadow-md);
  z-index: 100;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.mindmap-tooltip.visible {
  opacity: 1;
}

/* -------------------------------------------------------------
   AI QUIZ & FLASHCARDS GENERATOR STYLES
   ------------------------------------------------------------- */

/* Tab active styles */
.tab-btn-active {
  color: var(--accent-color) !important;
  border-bottom-color: var(--accent-color) !important;
}

/* Quiz Option Button States */
.quiz-option-btn {
  transition: all 0.2s ease;
}
.quiz-option-btn:not(:disabled):hover {
  border-color: var(--accent-color);
  background-color: rgba(99, 102, 241, 0.05);
}
.quiz-option-btn.correct {
  border-color: #10b981 !important;
  background-color: rgba(16, 185, 129, 0.1) !important;
  color: #10b981 !important;
}
.quiz-option-btn.incorrect {
  border-color: #ef4444 !important;
  background-color: rgba(239, 68, 68, 0.1) !important;
  color: #ef4444 !important;
}

/* 3D Flashcard flip effect */
.flashcard-wrapper {
  perspective: 1000px;
  width: 100%;
  height: 280px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  cursor: pointer;
}
.flashcard-wrapper.flipped .flashcard-inner {
  transform: rotateY(180deg);
}
.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}
.flashcard-front {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}
.flashcard-back {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  transform: rotateY(180deg);
}