/* Design System - AI in Education Training Microsite */

:root {
  --primary-color: #1e3a8a; /* Deep Royal Blue */
  --secondary-color: #10b981; /* Emerald Green */
  --accent-color: #3b82f6; /* Blue Accent */
  --bg-color: #0f172a; /* Slate Dark Background */
  --card-bg: rgba(30, 41, 59, 0.7); /* Translucent Card */
  --text-main: #f8fafc;
  --text-dim: #94a3b8;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-lg: 16px;
  --border-radius-md: 12px;
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem 0;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-weight: 500;
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-main);
}

/* Hero Section */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: -10%;
  width: 50%;
  height: 80%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  filter: blur(60px);
}

.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  line-height: 1.1;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.subtitle {
  font-size: 1.25rem;
  color: var(--text-dim);
  max-width: 800px;
  margin: 0 auto 3rem;
}

/* Buttons */
.btn {
  padding: 0.8rem 2rem;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  color: white;
  box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -1px rgba(59, 130, 246, 0.4);
}

/* URL Card Premium Styling */
.url-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.9));
    backdrop-filter: blur(20px);
    border: 2px solid var(--accent-color) !important;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.url-card:hover {
    transform: scale(1.02);
    border-color: var(--secondary-color) !important;
    box-shadow: 0 0 50px rgba(16, 185, 129, 0.2);
}

.url-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(transparent, var(--accent-color), transparent 30%);
    animation: rotate-border 4s linear infinite;
    z-index: -1;
    opacity: 0.3;
}

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

/* Sections */
section {
  padding: 6rem 0;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 3rem;
  text-align: center;
}

/* Module Grid */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius-lg);
  padding: 2.5rem;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-5px);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-color);
}

.card-number {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 3rem;
  font-weight: 900;
  opacity: 0.1;
  line-height: 1;
}

/* Footer */
footer {
  padding: 4rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: var(--text-dim);
}

/* Part Headers & Labels */
.part-label {
  color: var(--accent-color);
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  display: block;
  margin-bottom: 0.5rem;
}

.part-header {
  border-left: 4px solid var(--accent-color);
  padding-left: 1rem;
  margin-bottom: 2rem;
}

/* Hero Image Styling */
.hero-image-container {
  margin-top: -1rem;
  margin-bottom: 2rem;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0px); }
}

/* Meta Items */
.meta-item {
  background: rgba(255, 255, 255, 0.03);
  padding: 1.5rem 2rem;
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  min-width: 200px;
}

.meta-item h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

/* Active Link Styling */
.nav-links a.active {
  color: var(--secondary-color);
  border-bottom: 2px solid var(--secondary-color);
}

/* Long-form Reading Styles */
.content-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.content-section p {
  font-size: 1.15rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  text-align: justify;
}

.content-section h2 {
  text-align: left;
  font-size: 2.8rem;
  margin-top: 4rem;
  background: linear-gradient(to right, var(--text-main), var(--accent-color));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.content-section h3 {
  font-size: 1.8rem;
  margin: 2.5rem 0 1rem;
  color: var(--secondary-color);
}

.content-section h4 {
  font-size: 1.3rem;
  margin: 1.5rem 0 0.8rem;
  color: var(--accent-color);
}

.content-section ul, .content-section ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-dim);
}

.content-section li {
  margin-bottom: 0.8rem;
}

.highlight-box {
  background: rgba(59, 130, 246, 0.1);
  border-left: 4px solid var(--accent-color);
  padding: 2rem;
  margin: 2rem 0;
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

.warning-box {
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid #ef4444;
  padding: 2rem;
  margin: 2rem 0;
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

/* Sidebar Navigation for Manual */
.course-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
}

.sidebar-nav {
  position: sticky;
  top: 100px;
  height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 1rem;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

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

.sidebar-nav a {
  display: block;
  padding: 0.8rem 1rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: 8px;
  transition: var(--transition-smooth);
}

.sidebar-nav a:hover, .sidebar-nav a.active {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

/* Responsive Course Layout */
@media (max-width: 1024px) {
  .course-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-nav {
    display: none;
  }
}

/* Quiz Styles */
.quiz-container {
  max-width: 800px;
  margin: 4rem auto;
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  padding: 3rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg);
}

.question-text {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text-main);
}

.options-list {
  display: grid;
  gap: 1rem;
  list-style: none;
}

.option-item {
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.option-item:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--accent-color);
}

.option-item.selected {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

.quiz-footer {
  margin-top: 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#quiz-results {
  text-align: center;
  padding: 4rem 2rem;
}

.score-display {
  font-size: 4rem;
  font-weight: 900;
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

/* ==========================================================================
   PIVOT: PROFESSIONAL ACADEMIC PRINT SYSTEM (V6.0)
   Eliminates blank pages, fixes spacing, ensures continuous flow.
   ========================================================================== */

@media print {
  /* Reset and Basic Setup */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  
  html, body {
    background: white !important;
    color: black !important;
    margin: 0 !important;
    padding: 0 !important;
    font-size: 11pt;
    font-family: 'Inter', serif;
    line-height: 1.5;
  }

  /* Hide UI Elements */
  header, footer, .no-print, #pdf-export-btn, .sidebar-nav, .btn, #quiz-cta, .hero-image-container, .url-card::before {
    display: none !important;
  }

  /* Layout & Container */
  .container {
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 1cm 1.5cm !important;
    display: block !important;
  }

  main {
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
    display: block !important;
  }

  /* Typography & Spacing */
  section {
    page-break-inside: auto;
    margin-bottom: 0 !important;
    padding-bottom: 0.5cm !important;
    border-bottom: 0.5pt solid #eee;
  }

  h1 { 
    font-size: 26pt !important; 
    margin-top: 0 !important; 
    margin-bottom: 0.5cm !important; 
    text-align: center;
    color: #1e3a8a !important;
  }

  h2 {
    page-break-before: page !important; /* Starts new modules on new pages */
    margin-top: 1cm !important;
    margin-bottom: 0.4cm !important;
    font-size: 20pt !important;
    color: #1e3a8a !important;
    border-bottom: 2pt solid #1e3a8a;
    padding-bottom: 0.2cm;
  }

  h3 { 
    font-size: 14pt !important; 
    margin-top: 0.6cm !important; 
    margin-bottom: 0.2cm !important;
    color: #333 !important;
  }

  p { 
    margin: 0 0 0.3cm 0 !important; 
    text-align: justify;
    widows: 3;
    orphans: 3;
  }

  ul, ol {
    margin-bottom: 0.3cm !important;
  }

  li {
    margin-bottom: 0.1cm !important;
  }

  /* Blocks & Cards */
  .card, .highlight-box, .warning-box {
    background: #f9f9f9 !important;
    border: 1pt solid #ddd !important;
    padding: 0.5cm !important;
    margin: 0.4cm 0 !important;
    page-break-inside: avoid;
    border-radius: 4pt !important;
  }

  .part-label {
    font-size: 9pt !important;
    color: #10b981 !important;
    font-weight: 800 !important;
    margin-top: 1cm !important;
    display: block;
  }

  /* Links */
  a {
    text-decoration: none !important;
    color: black !important;
  }

  /* Footer for Print */
  .print-footer {
    display: block !important;
    position: running(footer);
    font-size: 8pt;
    text-align: center;
    color: #777;
    margin-top: 2cm;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .nav-links { display: none; }
  .meta-item { width: 100%; }
  .quiz-container { padding: 1.5rem; }
}