/*
 * Custom Theme for AI 380: Human-AI Interaction
 * Willamette University · Fall 2026
 * 
 * Design Concept: "Neural Bridge" — connecting human intuition with AI intelligence.
 * Palette: Deep indigo-navy primary, warm gold accent (Willamette-inspired),
 * electric cyan secondary. Clean, academic, yet forward-looking.
 * 
 * Author: Course Team, AI 380
 */

/* ===================================================================
   CSS Custom Properties (Design Tokens)
   =================================================================== */

:root {
  /* Primary Palette — Deep Indigo/Navy */
  --primary-dark:    #0D1B35;
  --primary-main:    #1A2F5E;
  --primary-light:   #2D4A8A;
  --primary-lighter: #4A6CB5;
  --primary-muted:   #8BA3CC;

  /* Accent — Willamette Gold / Warm Amber */
  --accent-dark:     #B8861A;
  --accent-main:     #D4A01F;
  --accent-light:    #F0BC3A;
  --accent-pale:     #FFF3CC;

  /* Secondary — Electric Cyan (AI/tech feel) */
  --cyan-dark:       #0096B4;
  --cyan-main:       #00B4D8;
  --cyan-light:      #48CAE4;
  --cyan-pale:       #CAF0F8;

  /* Semantic Colors */
  --success:         #2D9954;
  --info:            #2B7FD4;
  --warning:         #D48B2B;
  --danger:          #C9362B;

  /* Module Colors */
  --mod1-color:      #4A6CB5;   /* Blue — Module 1 */
  --mod2-color:      #2D9954;   /* Green — Module 2 */
  --mod3-color:      #D48B2B;   /* Amber — Module 3 */
  --mod4-color:      #8B2DC9;   /* Purple — Module 4 */

  /* Text */
  --text-primary:    #1A1F36;
  --text-secondary:  #4A5568;
  --text-muted:      #718096;
  --text-white:      #FFFFFF;
  --text-on-accent:  #1A1F36;

  /* Backgrounds */
  --bg-page:         #F5F7FB;
  --bg-surface:      #FFFFFF;
  --bg-raised:       #F0F4FA;
  --bg-dark:         #1A2F5E;
  --bg-darker:       #0D1B35;

  /* Borders */
  --border-light:    #E2E8F4;
  --border-main:     #C9D3E8;
  --border-strong:   #94A3C4;

  /* Shadows */
  --shadow-xs:       0 1px 3px rgba(13, 27, 53, 0.06);
  --shadow-sm:       0 2px 6px rgba(13, 27, 53, 0.08);
  --shadow-md:       0 4px 12px rgba(13, 27, 53, 0.12);
  --shadow-lg:       0 8px 24px rgba(13, 27, 53, 0.16);
  --shadow-xl:       0 16px 40px rgba(13, 27, 53, 0.22);
  --shadow-glow:     0 0 20px rgba(212, 160, 31, 0.25);

  /* Radius */
  --radius-xs:       3px;
  --radius-sm:       6px;
  --radius-md:       10px;
  --radius-lg:       16px;
  --radius-xl:       24px;
  --radius-full:     9999px;

  /* Spacing */
  --space-1:         0.25rem;
  --space-2:         0.5rem;
  --space-3:         0.75rem;
  --space-4:         1rem;
  --space-5:         1.25rem;
  --space-6:         1.5rem;
  --space-8:         2rem;
  --space-10:        2.5rem;
  --space-12:        3rem;
  --space-16:        4rem;

  /* Typography */
  --font-sans:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif:      'Georgia', 'Times New Roman', serif;
  --font-mono:       'JetBrains Mono', 'Fira Code', 'Monaco', 'Courier New', monospace;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* ===================================================================
   Base & Reset
   =================================================================== */

* {
  box-sizing: border-box;
}

body {
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ===================================================================
   Quarto Layout Overrides
   =================================================================== */

#quarto-content {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-12) var(--space-10);
  margin: var(--space-6) auto;
  max-width: 1400px;
}

main.content {
  max-width: 900px;
}

/* Navbar — always-visible fixed header.
   Override Quarto headroom.js so the bar never hides on scroll-down. */
#quarto-header.headroom,
#quarto-header.headroom--pinned,
#quarto-header.headroom--unpinned {
  transform: translateY(0) !important;
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  z-index: 1030 !important;
  will-change: unset !important;
  transition: none !important;
}

.navbar {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-main) 60%, var(--primary-light) 100%) !important;
  box-shadow: var(--shadow-md) !important;
  border-bottom: 3px solid var(--accent-main) !important;
  padding: 0.6rem 1.5rem !important;
}

.navbar-brand {
  font-weight: 700 !important;
  font-size: 1.1rem !important;
  color: var(--text-white) !important;
  letter-spacing: -0.3px;
}

.navbar-nav .nav-link {
  color: rgba(255, 255, 255, 0.88) !important;
  font-weight: 500 !important;
  font-size: 0.9rem !important;
  padding: 0.4rem 0.85rem !important;
  border-radius: var(--radius-sm) !important;
  transition: all var(--transition-fast) !important;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--accent-light) !important;
  background-color: rgba(255, 255, 255, 0.1) !important;
}

/* TOC sidebar */
#quarto-sidebar,
.sidebar {
  background-color: var(--bg-raised) !important;
  border-right: 2px solid var(--border-light) !important;
}

#TOC .active {
  color: var(--primary-light) !important;
  font-weight: 600 !important;
  border-left: 3px solid var(--accent-main) !important;
}

/* Page footer */
.nav-footer {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-main)) !important;
  color: rgba(255, 255, 255, 0.7) !important;
  border-top: 3px solid var(--accent-main) !important;
  padding: var(--space-6) var(--space-8) !important;
  font-size: 0.85rem !important;
}

.nav-footer a {
  color: var(--accent-light) !important;
  border-bottom: none !important;
}

/* ===================================================================
   Typography
   =================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  line-height: 1.3;
  font-weight: 700;
}

h1.title {
  color: var(--primary-dark);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  padding-bottom: var(--space-4);
  border-bottom: 4px solid var(--accent-main);
  margin-bottom: var(--space-6);
}

p.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 400;
  margin-top: -var(--space-4);
}

h2 {
  color: var(--primary-main);
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--border-light);
  position: relative;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(to right, var(--accent-main), var(--cyan-main));
  border-radius: var(--radius-full);
}

h3 {
  color: var(--primary-light);
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

h4 {
  color: var(--primary-main);
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

a {
  color: var(--primary-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
}

a:hover {
  color: var(--accent-dark);
  border-bottom-color: var(--accent-main);
}

strong {
  color: var(--primary-dark);
  font-weight: 600;
}

hr {
  border: none;
  height: 2px;
  background: linear-gradient(to right, var(--accent-main), var(--cyan-main), var(--primary-lighter));
  margin: var(--space-8) 0;
  border-radius: var(--radius-full);
  opacity: 0.6;
}

ul, ol {
  margin-left: var(--space-6);
  margin-bottom: var(--space-4);
}

li {
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

/* ===================================================================
   Tables
   =================================================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  background-color: var(--bg-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
}

thead {
  background: linear-gradient(135deg, var(--primary-main), var(--primary-light));
  color: var(--text-white);
}

th {
  padding: var(--space-4) var(--space-5);
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

td {
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
}

tbody tr:hover {
  background-color: var(--bg-raised);
  transition: background-color var(--transition-fast);
}

tbody tr:last-child td {
  border-bottom: none;
}

/* ===================================================================
   Code
   =================================================================== */

code {
  background-color: var(--bg-raised);
  color: var(--primary-light);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.88em;
  border: 1px solid var(--border-light);
}

pre {
  background-color: var(--bg-darker);
  color: #e2e8f0;
  padding: var(--space-6);
  border-radius: var(--radius-md);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--accent-main);
  margin: var(--space-4) 0;
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
  border: none;
  font-size: 0.9em;
}

/* ===================================================================
   Blockquotes
   =================================================================== */

blockquote {
  border-left: 4px solid var(--accent-main);
  background-color: var(--accent-pale);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-6) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

blockquote p {
  margin-bottom: 0;
  color: var(--text-secondary);
}

/* ===================================================================
   Images
   =================================================================== */

img {
  border-radius: var(--radius-md);
  max-width: 100%;
  height: auto;
}

/* ===================================================================
   Callout Boxes (Quarto native)
   =================================================================== */

.callout {
  border-radius: var(--radius-md) !important;
  box-shadow: var(--shadow-xs) !important;
  margin: var(--space-6) 0 !important;
}

.callout-note {
  border-left-color: var(--info) !important;
  background-color: rgba(43, 127, 212, 0.06) !important;
}

.callout-tip {
  border-left-color: var(--success) !important;
  background-color: rgba(45, 153, 84, 0.06) !important;
}

.callout-warning {
  border-left-color: var(--warning) !important;
  background-color: rgba(212, 139, 43, 0.06) !important;
}

.callout-important {
  border-left-color: var(--danger) !important;
  background-color: rgba(201, 54, 43, 0.06) !important;
}

/* ===================================================================
   Hero Banner (index page)
   =================================================================== */

.hero-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-main) 50%, var(--primary-light) 100%);
  margin: calc(-1 * var(--space-12)) calc(-1 * var(--space-10)) var(--space-10);
  padding: var(--space-16) var(--space-10);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(212, 160, 31, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 180, 216, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.hero-badge {
  display: inline-block;
  background: rgba(212, 160, 31, 0.2);
  color: var(--accent-light);
  border: 1px solid rgba(212, 160, 31, 0.4);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.hero-title {
  color: var(--text-white) !important;
  font-size: 3rem !important;
  font-weight: 800 !important;
  line-height: 1.1 !important;
  letter-spacing: -1px !important;
  margin-bottom: var(--space-3) !important;
  border-bottom: none !important;
  padding-bottom: 0 !important;
}

.hero-title::after {
  display: none !important;
}

.hero-subtitle {
  color: var(--accent-light);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.hero-tagline {
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.0rem;
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: var(--space-8);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.btn-hero-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-main), var(--accent-light));
  color: var(--text-on-accent) !important;
  border-bottom: none !important;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(212, 160, 31, 0.4);
  color: var(--text-on-accent) !important;
}

.btn-hero-secondary {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-white) !important;
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3) !important;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  backdrop-filter: blur(8px);
}

.btn-hero-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  color: var(--text-white) !important;
}

.btn-hero-discord {
  display: inline-block;
  background: rgba(88, 101, 242, 0.25);
  color: #b9beff !important;
  border: 1px solid rgba(88, 101, 242, 0.4) !important;
  border-bottom: 1px solid rgba(88, 101, 242, 0.4) !important;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
}

.btn-hero-discord:hover {
  background: rgba(88, 101, 242, 0.4);
  transform: translateY(-2px);
  color: #d0d3ff !important;
}

/* ===================================================================
   Key Info Grid (index page)
   =================================================================== */

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.info-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-4);
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.info-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--accent-main), var(--cyan-main));
}

.info-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-muted);
}

.info-icon {
  font-size: 1.8rem;
  margin-bottom: var(--space-2);
  line-height: 1;
}

.info-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.info-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-main);
  margin-bottom: var(--space-1);
}

.info-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===================================================================
   Quick Links Grid (index page)
   =================================================================== */

.quick-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.quick-link-card {
  background: var(--bg-raised);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  overflow: hidden;
}

.quick-link-card:hover {
  background: var(--primary-main);
  border-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.quick-link-card:hover .ql-desc {
  color: rgba(255,255,255,0.7);
}

.quick-link-card:hover .ql-text,
.quick-link-card:hover .ql-icon {
  color: var(--text-white);
}

.ql-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-5);
  text-decoration: none !important;
  border-bottom: none !important;
  color: var(--text-primary) !important;
  width: 100%;
  height: 100%;
}

.ql-inner:hover {
  color: var(--text-white) !important;
  border-bottom: none !important;
}

.ql-icon {
  font-size: 1.6rem;
  line-height: 1;
}

.ql-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: inherit;
}

.ql-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

/* ===================================================================
   Instructor Card (index page)
   =================================================================== */

.instructor-card {
  display: flex;
  gap: var(--space-8);
  align-items: flex-start;
  background: linear-gradient(135deg, var(--bg-raised), var(--bg-surface));
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  margin: var(--space-6) 0;
}

.instructor-photo-wrap {
  flex-shrink: 0;
}

.instructor-photo {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: var(--radius-full);
  border: 4px solid var(--primary-main);
  box-shadow: var(--shadow-md);
}

.instructor-name {
  font-size: 1.4rem !important;
  font-weight: 700 !important;
  color: var(--primary-dark) !important;
  margin-top: 0 !important;
  margin-bottom: var(--space-1) !important;
}

.instructor-title {
  font-size: 0.95rem;
  color: var(--accent-dark);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.instructor-dept {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.instructor-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.instructor-meta a {
  color: var(--primary-light);
  border-bottom: none;
}

.instructor-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.instructor-links a {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--primary-main);
  color: var(--text-white) !important;
  border: none !important;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.instructor-links a:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

/* ===================================================================
   Learning Objectives Grid (index page)
   =================================================================== */

.objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-5);
  margin: var(--space-6) 0;
}

.objective-card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  position: relative;
  transition: all var(--transition-base);
}

.objective-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.obj-number {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--space-3);
  opacity: 0.15;
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
}

.objective-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: var(--space-3);
}

.objective-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

.obj-research { border-top: 4px solid var(--primary-light); }
.obj-research .obj-number { color: var(--primary-light); }
.obj-design   { border-top: 4px solid var(--success); }
.obj-design .obj-number   { color: var(--success); }
.obj-eval     { border-top: 4px solid var(--accent-main); }
.obj-eval .obj-number     { color: var(--accent-main); }
.obj-collab   { border-top: 4px solid var(--cyan-main); }
.obj-collab .obj-number   { color: var(--cyan-main); }

/* ===================================================================
   Course Modules Timeline (index page)
   =================================================================== */

.modules-timeline {
  margin: var(--space-6) 0;
  position: relative;
}

.modules-timeline::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--mod1-color), var(--mod2-color), var(--mod3-color), var(--mod4-color));
  border-radius: var(--radius-full);
}

.module-item {
  display: flex;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

.mod-marker {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-white);
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.mod1 .mod-marker { background: var(--mod1-color); }
.mod2 .mod-marker { background: var(--mod2-color); }
.mod3 .mod-marker { background: var(--mod3-color); }
.mod4 .mod-marker { background: var(--mod4-color); }

.mod-content {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  flex: 1;
  transition: all var(--transition-base);
}

.mod-content:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.mod-content h4 {
  margin: 0 0 var(--space-1);
  font-size: 1.05rem;
  font-weight: 700;
}

.mod-weeks {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.mod-content > p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

.mod-topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.mod-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-raised);
  color: var(--primary-main);
  border: 1px solid var(--border-main);
}

/* ===================================================================
   Grade Overview Bar (index page)
   =================================================================== */

.grade-overview {
  margin: var(--space-6) 0;
}

.grade-bar-wrap {
  display: flex;
  height: 52px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-4);
}

.grade-segment {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: all var(--transition-base);
  cursor: default;
}

.grade-segment:hover {
  filter: brightness(1.1);
}

.g-participation { background: var(--mod1-color); }
.g-hw            { background: var(--mod2-color); }
.g-project       { background: linear-gradient(to right, var(--accent-dark), var(--accent-main)); }
.g-essay         { background: var(--mod4-color); }

.gs-pct {
  color: var(--text-white);
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1;
}

.gs-label {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.68rem;
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 90%;
}

.grade-note {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===================================================================
   Schedule Page Styles
   =================================================================== */

/* Module headers */
.module-header {
  color: var(--text-white) !important;
  border-radius: var(--radius-md) !important;
  padding: var(--space-4) var(--space-6) !important;
  margin: var(--space-10) 0 var(--space-6) !important;
  border-bottom: none !important;
  box-shadow: var(--shadow-md) !important;
}

.module-header::after { display: none !important; }

/* Week heading label — dark strip with white text for Schedule page */
.week-label {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-main));
  color: #ffffff !important;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: var(--space-8) 0 var(--space-4);
  font-size: 1.1rem;
  font-weight: 700;
  display: block;
}
.week-label a.anchor-section { display: none; }

/* Grade bar quiz segment */
.g-quiz { background: #D97706; }


.mod1-header { background: linear-gradient(135deg, var(--mod1-color), #2D4A8A); }
.mod2-header { background: linear-gradient(135deg, var(--mod2-color), #1E6B3E); }
.mod3-header { background: linear-gradient(135deg, var(--mod3-color), #A0621A); }
.mod4-header { background: linear-gradient(135deg, var(--mod4-color), #5A1A9A); }

/* Schedule legend */
.schedule-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-4) 0;
  padding: var(--space-4) var(--space-5);
  background: var(--bg-raised);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  color: var(--text-white);
}

.legend-lecture     { background: var(--primary-light); }
.legend-activity    { background: var(--success); }
.legend-presentation{ background: var(--mod4-color); }
.legend-noclass     { background: var(--text-muted); }
.legend-due         { background: var(--danger); }

/* Week cards */
.week-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-xs);
}

.session-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
}

.session-lecture    { background: rgba(74, 108, 181, 0.14); border-left: 4px solid var(--mod1-color); }
.session-activity   { background: rgba(45, 153, 84, 0.14);  border-left: 4px solid var(--success); }
.session-presentation { background: rgba(139, 45, 201, 0.14); border-left: 4px solid var(--mod4-color); }
.session-noclass    { background: rgba(113, 128, 150, 0.14); border-left: 4px solid var(--text-muted); }

.session-date {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  font-weight: 800;
  min-width: 140px;
  flex-shrink: 0;
}

.session-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary-dark);
  flex: 1;
}

.session-tags {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

.session-detail {
  padding: var(--space-4) var(--space-5);
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-bottom: 1px solid var(--border-light);
}

.week-readings {
  padding: var(--space-4) var(--space-5);
  background: var(--bg-raised);
  border-bottom: 1px dashed var(--border-light);
  font-size: 0.85rem;
}

.week-readings strong,
.week-readings p strong {
  color: var(--primary-main);
  display: block;
  margin-bottom: var(--space-2);
}

.week-due {
  padding: var(--space-3) var(--space-5);
  background: rgba(212, 139, 43, 0.08);
  border-top: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--warning);
  border-bottom: 2px solid rgba(212, 139, 43, 0.25);
}

/* Session type tags */
.tag-lecture, .tag-activity, .tag-presentation, .tag-noclass, .tag-due {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-white);
}

.tag-lecture      { background: var(--primary-light); }
.tag-activity     { background: var(--success); }
.tag-presentation { background: var(--mod4-color); }
.tag-noclass      { background: var(--text-muted); }
.tag-due          { background: var(--danger); }

.no-show-badge {
  display: inline-block;
  background: rgba(43, 127, 212, 0.15);
  color: var(--info);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(43, 127, 212, 0.3);
  margin-left: var(--space-2);
}

/* ===================================================================
   Assignment Cards
   =================================================================== */

.assignment-card {
  background: var(--bg-raised);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  margin: var(--space-4) 0;
  box-shadow: var(--shadow-xs);
  border-left: 4px solid var(--primary-light);
}

.assignment-card h4 {
  color: var(--primary-main);
  margin-top: 0;
}

/* ===================================================================
   Readings Page
   =================================================================== */

.reading-annotation {
  background: linear-gradient(135deg, rgba(0, 180, 216, 0.06), rgba(0, 150, 180, 0.03));
  border: 1px solid rgba(0, 180, 216, 0.25);
  border-left: 4px solid var(--cyan-main);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-4) 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* ===================================================================
   Project Page
   =================================================================== */

.project-domains-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
  margin: var(--space-5) 0;
}

.domain-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-xs);
  transition: all var(--transition-base);
}

.domain-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-muted);
}

.domain-icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
  line-height: 1;
}

.domain-card h4 {
  margin: 0 0 var(--space-2);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary-main);
}

.domain-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.5;
}

/* Project Timeline */
.project-timeline {
  margin: var(--space-6) 0;
  position: relative;
}

.project-timeline::before {
  content: '';
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--mod1-color), var(--mod2-color), var(--mod3-color), var(--mod4-color));
  border-radius: var(--radius-full);
}

.timeline-item {
  display: flex;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
  position: relative;
  z-index: 1;
}

.tl-marker {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--primary-main);
  color: var(--text-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.tl-active .tl-marker {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent-main));
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.tl-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  flex: 1;
  box-shadow: var(--shadow-xs);
}

.tl-content h4 {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  color: var(--primary-main);
}

.tl-due {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--warning);
  margin-bottom: var(--space-3);
}

.tl-content p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

.tl-content ul {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ===================================================================
   Responsive Adjustments
   =================================================================== */

@media (max-width: 1200px) {
  #quarto-content {
    padding: var(--space-8) var(--space-6);
  }
}

@media (max-width: 768px) {
  .hero-banner {
    margin: calc(-1 * var(--space-8)) calc(-1 * var(--space-6)) var(--space-8);
    padding: var(--space-10) var(--space-6);
  }

  .hero-title { font-size: 2.2rem !important; }
  .hero-subtitle { font-size: 1.1rem; }

  .info-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .quick-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .instructor-card {
    flex-direction: column;
  }

  .objectives-grid {
    grid-template-columns: 1fr;
  }

  .grade-segment .gs-label {
    display: none;
  }

  .session-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .session-date {
    min-width: unset;
  }

  #quarto-content {
    padding: var(--space-5) var(--space-4);
    margin: var(--space-2);
    border-radius: var(--radius-md);
  }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem !important; }
  .hero-cta-group { flex-direction: column; }
  .info-grid { grid-template-columns: 1fr 1fr; }
  .quick-links-grid { grid-template-columns: 1fr; }
  .modules-timeline::before { display: none; }
  .project-timeline::before { display: none; }
}

/* ===================================================================
   Animations
   =================================================================== */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.week-card,
.info-card,
.objective-card,
.quick-link-card,
.module-item,
.domain-card {
  animation: fadeInUp 0.4s ease-out both;
}

/* ===================================================================
   Print Styles
   =================================================================== */

@media print {
  body { background: white; }
  .hero-banner { background: var(--primary-main) !important; }
  #quarto-content { box-shadow: none; }
  .week-card, .info-card { box-shadow: none; border: 1px solid #ddd; }
  .navbar, .nav-footer { display: none; }
}

/* ===================================================================
   Accessibility
   =================================================================== */

:focus-visible {
  outline: 3px solid var(--accent-main);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: high) {
  :root {
    --primary-dark:  #000033;
    --primary-main:  #00007A;
    --text-primary:  #000000;
    --bg-page:       #FFFFFF;
    --bg-surface:    #FFFFFF;
  }
}