/* =====================================================
   MSIT 111 Research Paper — Stylesheet
   Academic paper look with modern interactivity
   ===================================================== */
:root {
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'Outfit', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --primary: #0038A8;
  --accent: #FCD116;
  --red: #CE1126;
  --bg: #fafbfc;
  --paper: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  color: var(--text);
  background: var(--bg);
  font-size: 1.05rem;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

/* ===== PAPER CONTAINER ===== */
.paper {
  max-width: 860px;
  margin: 0 auto;
  background: var(--paper);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.paper-section {
  padding: 48px 56px;
  border-bottom: 1px solid var(--border);
}

@media (max-width: 768px) {
  .paper-section { padding: 28px 20px; }
}

/* ===== COVER PAGE ===== */
.cover-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  border-bottom: 4px solid var(--primary);
  padding: 60px 40px;
}

.cover-university {
  font-family: var(--sans);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
  margin-bottom: 40px;
}

.cover-title {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.3;
  max-width: 700px;
  margin-bottom: 16px;
}

.cover-subtitle {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 600px;
  margin-bottom: 36px;
  font-style: italic;
}

.cover-meta {
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--text);
  line-height: 2;
}

.cover-meta strong { color: var(--primary); }

.cover-badge {
  display: inline-block;
  padding: 6px 18px;
  background: var(--primary);
  color: #fff;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 4px;
  margin-top: 28px;
}

/* ===== HEADINGS ===== */
h1.section-heading {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

h2.sub-heading {
  font-family: var(--sans);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 28px;
  margin-bottom: 10px;
}

.section-number {
  font-family: var(--mono);
  font-weight: 800;
  color: var(--accent);
  margin-right: 8px;
}

.section-divider {
  width: 50px;
  height: 3px;
  background: var(--accent);
  margin-bottom: 24px;
  border: none;
}

/* ===== TEXT STYLES ===== */
p { text-align: justify; margin-bottom: 1rem; }

blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: #fffef5;
  font-style: italic;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ===== DATA CARDS ===== */
.data-card {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}

.data-card-dark {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
  color: #e2e8f0;
}

.data-card h6 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.stat-inline {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--primary);
}

.stat-red { color: var(--red); }
.stat-green { color: #16a34a; }
.stat-yellow { color: #ca8a04; }

/* ===== TABLES ===== */
.paper-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin: 16px 0;
}

.paper-table thead th {
  background: var(--primary);
  color: #fff;
  padding: 10px 12px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.78rem;
  text-align: left;
  white-space: nowrap;
}

.paper-table tbody td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.paper-table tbody tr:hover { background: #f1f5f9; }

.paper-table .cell-danger { color: var(--red); font-weight: 700; }
.paper-table .cell-warn { color: #f59e0b; font-weight: 700; }
.paper-table .cell-ok { color: #16a34a; font-weight: 700; }

/* ===== CHART CONTAINER ===== */
.chart-wrap {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
}

.chart-wrap h6 {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 12px;
}

/* ===== TABS ===== */
.level-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.level-tab {
  padding: 10px 24px;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

.level-tab:hover { color: var(--primary); }

.level-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ===== SIDEBAR NAV ===== */
.paper-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  background: #0f172a;
  padding: 24px 0;
  overflow-y: auto;
  z-index: 1000;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
}

.paper-nav.open { transform: translateX(0); }

.paper-nav-toggle {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 1001;
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: background 0.2s;
}

.paper-nav-toggle:hover { background: #002a7a; }

.paper-nav .nav-header {
  padding: 0 20px 16px;
  border-bottom: 1px solid #1e293b;
  margin-bottom: 12px;
}

.paper-nav .nav-header h6 {
  font-family: var(--sans);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.paper-nav a {
  display: block;
  padding: 8px 20px;
  color: #94a3b8;
  font-family: var(--sans);
  font-size: 0.82rem;
  text-decoration: none;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.paper-nav a:hover,
.paper-nav a.active {
  color: #f8fafc;
  background: rgba(255,255,255,0.04);
  border-left-color: var(--accent);
}

.paper-nav .nav-section {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: #475569;
  padding: 16px 20px 6px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ===== METHODOLOGY BOX ===== */
.method-box {
  background: linear-gradient(135deg, #eff6ff, #f0fdf4);
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  padding: 24px;
  margin: 20px 0;
}

.method-box h6 {
  font-family: var(--sans);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

/* ===== QUESTION ACCORDION ===== */
.qa-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  overflow: hidden;
}

.qa-question {
  padding: 14px 18px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
  background: #f8fafc;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.qa-question:hover { background: #f1f5f9; }

.qa-answer {
  padding: 0 18px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 0.92rem;
  color: var(--muted);
}

.qa-answer.open {
  max-height: 500px;
  padding: 14px 18px;
}

/* ===== REFERENCES ===== */
.ref-entry {
  font-size: 0.88rem;
  padding: 8px 0;
  border-bottom: 1px solid #f1f5f9;
  line-height: 1.6;
}

.ref-entry a { color: var(--primary); word-break: break-all; }

/* ===== FOOTER ===== */
.paper-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 32px 40px;
  text-align: center;
  font-family: var(--sans);
  font-size: 0.82rem;
}

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

/* ===== REGION SELECTOR ===== */
.region-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.region-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s;
}

.region-btn:hover { border-color: var(--primary); color: var(--primary); }

.region-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== FINDING CALLOUT ===== */
.finding-callout {
  border-left: 4px solid var(--red);
  background: #fef2f2;
  padding: 16px 20px;
  margin: 16px 0;
  border-radius: 0 8px 8px 0;
}

.finding-callout.green {
  border-left-color: #16a34a;
  background: #f0fdf4;
}

.finding-callout.blue {
  border-left-color: var(--primary);
  background: #eff6ff;
}

.finding-callout h6 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.finding-callout p {
  font-size: 0.9rem;
  margin-bottom: 0;
  text-align: left;
}

/* ===== BACK TO PRESENTATION LINK ===== */
.back-link {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  background: var(--primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0,56,168,0.3);
  transition: all 0.2s;
}

.back-link:hover {
  background: #002a7a;
  color: #fff;
  transform: translateY(-2px);
}

/* ===== PRINT ===== */
@media print {
  .paper-nav, .paper-nav-toggle, .back-link { display: none !important; }
  .paper-section { page-break-inside: avoid; }
  body { font-size: 10pt; }
}