/* ============================================
   AI for Urban Health — Course Website Styles
   Drexel University | UHC Summer Institute 2026
   ============================================ */

/* --- Color Variables --- */
:root {
  --primary: #003366;
  --primary-light: #004080;
  --accent: #0066cc;
  --accent-light: #e8f0fe;
  --text-dark: #1a1a2e;
  --text-muted: #555;
  --bg-light: #f8f9fa;
  --border-light: #dee2e6;
  --success: #28a745;
  --warning-bg: #fff3cd;
  --activity-bg: #f0f7ff;
  --activity-border: #0066cc;
}

/* --- Base Typography --- */
body {
  font-family: 'Source Sans Pro', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.7;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--primary);
  font-weight: 600;
}

h1 {
  border-bottom: 3px solid var(--accent);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.4rem;
}

h3 {
  margin-top: 1.8rem;
  color: var(--primary-light);
}

/* --- Links --- */
a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* --- Navbar Overrides --- */
.navbar {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.15rem;
}

/* --- Page Footer --- */
.nav-footer {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.9);
}

/* --- Hero / Banner Section --- */
.hero-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  padding: 3rem 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  text-align: center;
}

.hero-banner h1 {
  color: white;
  border-bottom: none;
  font-size: 2.4rem;
  margin-bottom: 0.5rem;
}

.hero-banner .subtitle {
  font-size: 1.3rem;
  opacity: 0.9;
  margin-bottom: 0.3rem;
}

.hero-banner .tagline {
  font-size: 1rem;
  opacity: 0.8;
}

/* --- Day Header --- */
.day-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  padding: 2rem 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
}

.day-header h1 {
  color: white;
  border-bottom: none;
  margin-bottom: 0.3rem;
}

.day-header .day-subtitle {
  font-size: 1.15rem;
  opacity: 0.9;
}

.day-header .day-time {
  font-size: 0.95rem;
  opacity: 0.75;
  margin-top: 0.5rem;
}

/* --- Activity Sections --- */
.activity {
  background: var(--activity-bg);
  border-left: 4px solid var(--activity-border);
  border-radius: 0 8px 8px 0;
  padding: 1.5rem 1.5rem 1rem 1.5rem;
  margin: 1.5rem 0;
}

.activity h3 {
  color: var(--accent);
  margin-top: 0;
  font-size: 1.2rem;
}

.activity .activity-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-style: italic;
}

/* --- Quick Links Grid --- */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.quick-link-card {
  background: white;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.2rem;
  text-align: center;
  transition: all 0.2s ease;
  text-decoration: none;
  color: var(--text-dark);
}

.quick-link-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.15);
  transform: translateY(-2px);
  text-decoration: none;
}

.quick-link-card .card-day {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.quick-link-card .card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 0.3rem;
}

/* --- Info Box --- */
.info-box {
  background: var(--accent-light);
  border: 1px solid #b8d4f0;
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
}

/* --- Checklist --- */
.checklist ul {
  list-style: none;
  padding-left: 0;
}

.checklist ul li {
  padding: 0.4rem 0 0.4rem 2rem;
  position: relative;
}

.checklist ul li::before {
  content: "☐";
  position: absolute;
  left: 0;
  font-size: 1.1rem;
}

/* --- Tables --- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

th {
  background: var(--primary);
  color: white;
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
}

td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border-light);
}

tr:nth-child(even) {
  background: var(--bg-light);
}

tr:hover {
  background: var(--accent-light);
}

/* --- Scenario Cards (Day 4) --- */
.scenario-card {
  background: white;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1rem 0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.scenario-card h4 {
  color: var(--accent);
  margin-top: 0;
}

/* --- Ethical Dilemma Cards (Day 5) --- */
.dilemma-card {
  background: #fff8f0;
  border-left: 4px solid #e67e22;
  border-radius: 0 8px 8px 0;
  padding: 1.5rem;
  margin: 1rem 0;
}

.dilemma-card h4 {
  color: #d35400;
  margin-top: 0;
}

/* --- Challenge Exercise Sections --- */
.challenge-exercise {
  background: #fffbf0;
  border-left: 4px solid #d4a017;
  border-radius: 0 8px 8px 0;
  padding: 1.5rem 1.5rem 1rem 1.5rem;
  margin: 1.5rem 0;
}

.challenge-exercise h3 {
  color: #b8860b;
  margin-top: 0;
  font-size: 1.2rem;
}

.challenge-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-style: italic;
  padding: 0.4rem 0.8rem;
  background: rgba(212, 160, 23, 0.08);
  border-radius: 4px;
  display: inline-block;
}

.bonus-challenges-section {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px dashed #d4a017;
}

.bonus-challenges-section h2 {
  color: #b8860b;
  border-bottom: 1px solid #e8d48b;
}

.challenge-card {
  background: #fffbf0;
  border: 1px solid #e8d48b;
  border-left: 4px solid #d4a017;
  border-radius: 0 8px 8px 0;
  padding: 1.2rem 1.5rem;
  margin: 1rem 0;
}

.challenge-card h4 {
  color: #b8860b;
  margin-top: 0;
}

.challenge-card .challenge-meta {
  margin-bottom: 0.5rem;
}

/* --- Code Blocks --- */
pre {
  background: #f5f5f5;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
}

code {
  font-size: 0.9em;
}

/* --- Callout Overrides --- */
.callout {
  border-radius: 8px;
  margin: 1.5rem 0;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-banner {
    padding: 2rem 1rem;
  }

  .hero-banner h1 {
    font-size: 1.8rem;
  }

  .quick-links {
    grid-template-columns: 1fr;
  }

  .activity {
    padding: 1rem;
  }

  .challenge-exercise,
  .challenge-card {
    padding: 1rem;
  }
}

/* --- Print Styles --- */
@media print {
  .navbar, .nav-footer, .sidebar {
    display: none !important;
  }

  body {
    font-size: 11pt;
    line-height: 1.5;
    color: black;
  }

  h1, h2, h3 {
    color: black;
    page-break-after: avoid;
  }

  .hero-banner, .day-header {
    background: white !important;
    color: black !important;
    border: 2px solid black;
  }

  .hero-banner h1, .day-header h1 {
    color: black !important;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }

  .activity {
    border-left: 3px solid black;
    background: white;
  }

  .challenge-exercise,
  .challenge-card {
    border-left: 3px solid #999;
    background: white;
  }

  .bonus-challenges-section {
    border-top: 2px dashed #999;
  }

  table {
    page-break-inside: avoid;
  }

  th {
    background: #eee !important;
    color: black !important;
  }
}

/* Slides call-to-action buttons (workshop decks) */
.slides-cta { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1.2rem 0 1.6rem; }
.slides-cta .btn { font-weight: 600; }