/* Imports nature-inspired Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Anton&family=Marcellus&family=Bebas+Neue&family=Fira+Code:wght@400;500;700&display=swap');

:root {
  /* Color Palette */
  --forest-canopy: #2d7d32;
  --sunset-amber: #ff8f00;
  --bg-white: #ffffff;
  --morning-mist: #f4f6fc;
  --text-dark: #000000;
  --spring-meadow: #c8e6c9;
  
  /* 8px Base Grid scale */
  --space-1: 8px;
  --space-1-5: 12px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-8: 64px;
  --space-16: 128px;
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  
  /* Layout Transitions */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Core Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Marcellus', Georgia, serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--morning-mist);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Typography Classes */
h1, h2, h3, h4 {
  font-family: 'Anton', Impact, sans-serif;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dark);
}

.label {
  font-family: 'Bebas Neue', Impact, sans-serif;
  letter-spacing: 3.6px;
  font-weight: 400;
  text-transform: uppercase;
}

/* Scrollbar styles */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--morning-mist);
}
::-webkit-scrollbar-thumb {
  background: var(--spring-meadow);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--forest-canopy);
}

/* Main Container & Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header & Navigation Bar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  background-color: var(--bg-white);
  border-bottom: 2px solid var(--morning-mist);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-1-5);
}

.nav-logo-svg {
  width: 32px;
  height: 32px;
  fill: var(--forest-canopy);
}

.nav-title {
  font-family: 'Anton', sans-serif;
  font-size: 26px;
  color: var(--forest-canopy);
  letter-spacing: 1px;
}

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

.nav-btn {
  background: none;
  border: none;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 16px;
  letter-spacing: 2px;
  padding: var(--space-1) var(--space-2);
  color: var(--text-dark);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
}

.nav-btn:hover, .nav-btn.active {
  background-color: var(--morning-mist);
  color: var(--forest-canopy);
}

.cta-btn {
  background-color: var(--forest-canopy);
  color: var(--bg-white);
  border: none;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 15px;
  letter-spacing: 2px;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  transition: var(--transition-smooth);
}

.cta-btn:hover {
  background-color: var(--sunset-amber);
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  background-color: var(--bg-white);
  padding: var(--space-4) var(--space-4);
  text-align: center;
  border-bottom: 2px solid var(--morning-mist);
  position: relative;
  overflow: hidden;
}

/* Organic silhouettes as background decor */
.hero::before {
  content: '';
  position: absolute;
  top: -40px;
  left: -40px;
  width: 160px;
  height: 160px;
  background-color: var(--spring-meadow);
  opacity: 0.25;
  clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
  z-index: 1;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -40px;
  right: -40px;
  width: 200px;
  height: 200px;
  background-color: var(--spring-meadow);
  opacity: 0.25;
  clip-path: circle(50% at 50% 50%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
}

.hero-tag {
  color: var(--forest-canopy);
  font-size: 14px;
  margin-bottom: var(--space-1);
}

.hero-title {
  font-size: 48px;
  margin-bottom: var(--space-1-5);
  color: var(--text-dark);
}

.hero-desc {
  font-size: 18px;
  margin-bottom: var(--space-3);
  color: var(--text-dark);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.search-box-container {
  max-width: 500px;
  margin: 0 auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: 'Marcellus', serif;
  font-size: 16px;
  border: 2px solid var(--spring-meadow);
  border-radius: var(--radius-md);
  background-color: var(--morning-mist);
  outline: none;
  transition: var(--transition-smooth);
}

.search-input:focus {
  border-color: var(--forest-canopy);
  background-color: var(--bg-white);
  box-shadow: 0 0 0 3px rgba(45, 125, 50, 0.1);
}

/* Dashboard Workspace layout */
.dashboard {
  display: flex;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  gap: var(--space-3);
}

/* Left Sidebar Directory */
.sidebar {
  width: 320px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.category-group {
  margin-bottom: var(--space-2);
}

.category-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 14px;
  color: var(--forest-canopy);
  letter-spacing: 3px;
  padding: var(--space-1) var(--space-1-5);
  border-bottom: 1px solid var(--morning-mist);
  margin-bottom: var(--space-1);
}

.topic-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.topic-item-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-family: 'Marcellus', serif;
  font-size: 15px;
  padding: var(--space-1-5) var(--space-2);
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--text-dark);
  transition: var(--transition-smooth);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topic-item-btn:hover {
  background-color: var(--morning-mist);
}

.topic-item-btn.active {
  background-color: var(--spring-meadow);
  color: var(--forest-canopy);
  font-weight: 700;
}

/* Right Content Main View */
.main-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 0; /* Prevents flex items from breaking layout overflow */
}

/* Content cards styled with flat surface, clean border */
.content-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  border: 1px solid rgba(0, 0, 0, 0.05);
  position: relative;
  overflow: hidden;
}

.content-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--forest-canopy);
}

.content-card.accent::after {
  background-color: var(--sunset-amber);
}

/* Topic Header */
.topic-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-2);
  flex-wrap: wrap;
  gap: var(--space-1-5);
}

.topic-category-tag {
  background-color: var(--morning-mist);
  color: var(--text-dark);
  padding: 4px var(--space-1-5);
  border-radius: var(--radius-md);
  font-size: 12px;
  border: 1px solid var(--spring-meadow);
}

.topic-title-h2 {
  font-size: 36px;
  color: var(--text-dark);
}

/* Analogy Layout */
.analogy-title-h3 {
  font-size: 20px;
  margin-bottom: var(--space-1-5);
  color: var(--forest-canopy);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.analogy-text {
  font-size: 16px;
  color: var(--text-dark);
  margin-bottom: var(--space-2);
  text-align: justify;
}

.analogy-text strong {
  color: var(--forest-canopy);
}

/* Visualization Display */
.viz-display-box {
  background-color: var(--morning-mist);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  border: 1px solid var(--spring-meadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  width: 100%;
}

/* Interactive Simulator Controls */
.sim-controls {
  display: flex;
  gap: var(--space-1-5);
  margin-top: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}

.sim-input {
  width: 80px;
  padding: var(--space-1) var(--space-1-5);
  border: 2px solid var(--spring-meadow);
  border-radius: var(--radius-sm);
  outline: none;
  font-family: 'Fira Code', monospace;
  font-size: 14px;
}

.sim-btn {
  background-color: var(--bg-white);
  border: 2px solid var(--forest-canopy);
  color: var(--forest-canopy);
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 1.5px;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.sim-btn:hover {
  background-color: var(--forest-canopy);
  color: var(--bg-white);
}

.sim-btn.secondary {
  border-color: var(--sunset-amber);
  color: var(--sunset-amber);
}

.sim-btn.secondary:hover {
  background-color: var(--sunset-amber);
  color: var(--bg-white);
}

/* Subtopics Tabed View */
.subtopics-tab-bar {
  display: flex;
  border-bottom: 2px solid var(--morning-mist);
  margin-bottom: var(--space-2);
  gap: var(--space-1);
  overflow-x: auto;
  scrollbar-width: none;
}
.subtopics-tab-bar::-webkit-scrollbar {
  display: none;
}

.subtopic-tab {
  background: none;
  border: none;
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 2px;
  font-size: 15px;
  padding: var(--space-1) var(--space-2);
  color: var(--text-dark);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.subtopic-tab:hover {
  color: var(--forest-canopy);
}

.subtopic-tab.active {
  color: var(--forest-canopy);
  border-bottom-color: var(--forest-canopy);
}

.subtopic-desc {
  margin-bottom: var(--space-2);
  font-size: 15px;
}

/* Java Code & Syntax layout */
.code-container {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #1e1e1e; /* Visual contrast for code snippet */
  border: 1px solid #333;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  background-color: #2d2d2d;
  color: #c5c5c5;
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 1.5px;
  font-size: 13px;
}

.copy-btn {
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 1px;
}

.copy-btn:hover {
  background-color: var(--forest-canopy);
}

.code-block {
  padding: var(--space-2);
  font-family: 'Fira Code', 'Google Sans Code', monospace;
  font-size: 14px;
  color: #f8f8f2;
  overflow-x: auto;
  max-height: 400px;
  line-height: 1.5;
}

/* Revision Cheatsheet View */
.cheatsheet-view {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-2);
}

.cheatsheet-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  border: 1px solid var(--spring-meadow);
  display: flex;
  flex-direction: column;
  gap: var(--space-1-5);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.cheatsheet-card:hover {
  border-color: var(--forest-canopy);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(45, 125, 50, 0.1);
}

.cheatsheet-header {
  font-family: 'Anton', sans-serif;
  font-size: 18px;
  color: var(--forest-canopy);
  border-bottom: 2px solid var(--morning-mist);
  padding-bottom: 4px;
}

.cheatsheet-subname {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 14px;
  letter-spacing: 1.5px;
  color: var(--text-dark);
}

.cheatsheet-syntax {
  background-color: var(--morning-mist);
  padding: var(--space-1-5);
  border-radius: var(--radius-sm);
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  color: #c7254e;
  border: 1px solid rgba(0, 0, 0, 0.05);
  white-space: pre-wrap;
  word-break: break-all;
}

/* AI Tutor Floating Action Button (FAB) */
.ai-tutor-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--forest-canopy);
  color: var(--bg-white);
  border: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: var(--transition-smooth);
}

.ai-tutor-fab:hover {
  background-color: var(--sunset-amber);
  transform: scale(1.08) translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.ai-tutor-fab:active {
  transform: scale(0.95);
}

.fab-icon {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.fab-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background-color: var(--sunset-amber);
  color: var(--text-dark);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 11px;
  letter-spacing: 0.5px;
  padding: 1px 6px;
  border-radius: 10px;
  border: 2px solid var(--bg-white);
  font-weight: bold;
}

/* Slide-out Drawer Panel */
.ai-tutor-drawer {
  position: fixed;
  top: 0;
  right: 0;
  height: 100vh;
  width: 420px;
  background-color: var(--bg-white);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  z-index: 1001;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ai-tutor-drawer.open {
  transform: translateX(0);
}

.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  z-index: 1000;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  border-bottom: 2px solid var(--morning-mist);
  background-color: var(--bg-white);
  flex-shrink: 0;
}

.drawer-title-flex {
  display: flex;
  align-items: center;
  gap: var(--space-1-5);
}

.tutor-logo-svg {
  width: 24px;
  height: 24px;
  fill: var(--forest-canopy);
}

.drawer-close-btn {
  background: none;
  border: none;
  color: var(--text-dark);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.drawer-close-btn:hover {
  background-color: var(--morning-mist);
  color: var(--sunset-amber);
}

.drawer-content {
  flex: 1;
  padding: var(--space-2);
  background-color: var(--morning-mist);
  overflow-y: auto;
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-1);
  min-height: 100%;
}

.chat-msg {
  padding: 8px var(--space-1-5);
  border-radius: var(--radius-md);
  max-width: 85%;
  font-size: 14px;
  line-height: 1.5;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.chat-msg.bot {
  background-color: var(--spring-meadow);
  color: var(--text-dark);
  align-self: flex-start;
  border-top-left-radius: 2px;
}

.chat-msg.user {
  background-color: var(--forest-canopy);
  color: var(--bg-white);
  align-self: flex-end;
  border-top-right-radius: 2px;
}

.drawer-footer {
  padding: var(--space-2) var(--space-3);
  border-top: 2px solid var(--morning-mist);
  background-color: var(--bg-white);
  flex-shrink: 0;
}

.chat-input-row {
  display: flex;
  gap: var(--space-1);
}

.chat-input {
  flex: 1;
  padding: var(--space-1-5) var(--space-2);
  border: 2px solid var(--spring-meadow);
  border-radius: var(--radius-sm);
  outline: none;
  font-family: 'Marcellus', serif;
  font-size: 14px;
  background-color: var(--morning-mist);
  transition: var(--transition-smooth);
}

.chat-input:focus {
  border-color: var(--forest-canopy);
  background-color: var(--bg-white);
}

.chat-send-btn {
  background-color: var(--forest-canopy);
  color: #fff;
  border: none;
  padding: var(--space-1-5) var(--space-2.5);
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 1.5px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
}

.chat-send-btn:hover {
  background-color: var(--sunset-amber);
}

/* Topic Directory Header & Collapse Styles */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--morning-mist);
  padding: var(--space-1) var(--space-1-5);
  margin-bottom: var(--space-1);
}

.directory-toggle-btn {
  display: none;
  background: none;
  border: none;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--forest-canopy);
  cursor: pointer;
  align-items: center;
  gap: 4px;
  padding: 4px var(--space-1);
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
}

.directory-toggle-btn:hover {
  background-color: var(--morning-mist);
}

/* Hover highlights for active map playground */
.hoverable-part {
  transition: var(--transition-smooth);
}

.hoverable-part:hover {
  stroke: var(--sunset-amber) !important;
  stroke-width: 3px !important;
  fill-opacity: 0.6 !important;
}

/* Dynamic Mind-Map Flowchart interactive styling */
.flow-node:hover rect {
  stroke: var(--sunset-amber) !important;
  stroke-width: 3px !important;
  fill: var(--spring-meadow) !important;
  fill-opacity: 0.8;
  transition: var(--transition-smooth);
}

.flow-relation:hover path {
  stroke: var(--sunset-amber) !important;
  stroke-width: 4px !important;
  marker-end: url(#relation-arrow-hover) !important;
  transition: var(--transition-smooth);
}

/* Node Glowing Synchronizer when hovering relationship paths */
.glow-highlight {
  stroke: var(--sunset-amber) !important;
  stroke-width: 3.5px !important;
  fill: var(--spring-meadow) !important;
  fill-opacity: 0.9 !important;
  filter: drop-shadow(0 0 4px rgba(255, 143, 0, 0.4));
  transition: var(--transition-smooth);
}

/* Animations for Simulator */
@keyframes slideIn {
  from { transform: translateY(15px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.animate-slide {
  animation: slideIn 0.3s ease-out forwards;
}

/* Mobile Styling Rules (Responsive Shift for Android and Small Screen Browsers) */
@media (max-width: 960px) {
  .dashboard {
    flex-direction: column;
    padding: var(--space-2);
    gap: var(--space-2);
  }
  
  .sidebar {
    width: 100%;
  }

  .directory-toggle-btn {
    display: flex; /* Show toggle button on mobile */
  }

  .directory-collapsible {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  }

  .directory-collapsible.open {
    max-height: 2000px;
    transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
    padding-bottom: var(--space-1);
  }

  .sidebar-header {
    border-bottom: none;
    margin-bottom: 0;
  }

  .sidebar-card {
    border: 1px solid var(--spring-meadow);
  }

  .hero {
    padding: var(--space-3) var(--space-2);
  }

  .hero::before, .hero::after {
    display: none; /* Hide background shapes to prevent zoom/overflow */
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 15px;
    margin-bottom: var(--space-2);
  }

  .navbar {
    padding: var(--space-1) var(--space-2);
  }

  .nav-title {
    font-size: 20px;
  }

  /* Make Tutor Drawer cover full height & width on mobile */
  .ai-tutor-drawer {
    width: 100%;
    max-width: 100%;
  }

  /* Optimize simulator box SVGs to scale */
  .viz-display-box svg {
    max-width: 100%;
    height: auto;
  }

  /* Touch-friendly target heights */
  .sim-controls .sim-btn, .sim-controls .sim-input {
    height: 44px;
    font-size: 15px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

/* Small screens: Horizontal nav items scroll */
@media (max-width: 600px) {
  .navbar {
    flex-direction: column;
    gap: var(--space-1.5);
    align-items: center;
    padding: var(--space-1.5);
  }

  .nav-brand {
    justify-content: center;
  }

  .nav-links {
    width: 100%;
    display: flex;
    justify-content: flex-start;
    overflow-x: auto;
    white-space: nowrap;
    padding: var(--space-1) 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-btn {
    flex: 0 0 auto;
    font-size: 14px;
    padding: 6px 12px;
  }
}