/* ============================================================
   ISSS626 Coursework design system
   CSS variables are defined per-theme in theme-light.scss /
   theme-dark.scss (scss:rules block). Everything else lives here.
   ============================================================ */

html {
  scroll-behavior: auto;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-size: 16.5px;
  line-height: 1.7;
}

#quarto-content > * {
  background-color: var(--bg);
}

/* ---------- Navbar ---------- */

.navbar {
  min-height: var(--nav-height);
  border-bottom: 1px solid var(--border);
  box-shadow: none !important;
}

.navbar-brand {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.navbar .nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary) !important;
  transition: color 150ms ease;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--text-primary) !important;
}

/* ---------- Sidebar (left nav) ---------- */

#quarto-sidebar {
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border);
}

.sidebar-navigation .sidebar-section .sidebar-item-container,
.sidebar-navigation > .sidebar-item .sidebar-item-container {
  font-size: 0.88rem;
}

.sidebar-navigation .sidebar-item .sidebar-item-text {
  color: var(--text-secondary);
  transition: color 150ms ease;
}

.sidebar-navigation .sidebar-item .sidebar-item-text:hover {
  color: var(--text-primary);
}

.sidebar-navigation .sidebar-item.active > .sidebar-item-container .sidebar-item-text,
.sidebar-navigation .sidebar-item-container.active .sidebar-item-text {
  color: var(--accent);
  font-weight: 600;
}

.sidebar-section .sidebar-item-container {
  padding-top: 0.15rem;
  padding-bottom: 0.15rem;
}

/* ---------- Right TOC ---------- */

#quarto-margin-sidebar .toc-actions,
nav#TOC {
  font-size: 0.82rem;
}

nav#TOC ul li a {
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  padding-left: 0.6rem;
  transition: color 150ms ease, border-color 150ms ease;
}

nav#TOC ul li a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 500;
}

nav#TOC > h2, nav#TOC > .toc-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  font-weight: 600;
}

/* ---------- Main article width & headings ---------- */

#quarto-document-content {
  max-width: var(--max-content-width);
}

h1.title {
  font-size: clamp(1.8rem, 1.6rem + 1vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 0.2rem;
}

/* Kicker: repurpose the YAML `subtitle` field to sit ABOVE the title */
#title-block-header.quarto-title-block {
  display: flex;
  flex-direction: column;
}

#title-block-header .subtitle {
  order: -1;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

#title-block-header .quarto-title-meta {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 0.35rem;
}

#title-block-header .quarto-title-meta-heading {
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: none;
  font-size: 0.78rem;
}

.quarto-title-affiliation, .quarto-title-author-affiliation {
  color: var(--text-secondary);
  font-weight: 400;
}

h2 {
  font-size: 1.4rem;
  font-weight: 650;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

h1.title + p + h2:first-of-type,
#title-block-header + h2 {
  border-top: none;
  padding-top: 0;
  margin-top: 2rem;
}

h3 {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 2rem;
}

p {
  color: var(--text-primary);
}

/* ---------- Breadcrumb ---------- */

p.breadcrumb, .breadcrumb {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* ---------- Pills / tags ---------- */

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.75rem;
}

.pill {
  display: inline-block;
  font-family: var(--bs-font-monospace, "JetBrains Mono", monospace);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background-color: var(--surface);
}

/* ---------- Links ---------- */

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

#quarto-document-content a:not(.pill):not(.sidebar-item-text):not(.nav-link):not(.btn) {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 2px;
  transition: color 150ms ease, text-decoration-color 150ms ease;
}

#quarto-document-content a:not(.pill):not(.sidebar-item-text):not(.nav-link):not(.btn):hover {
  color: var(--accent-hover);
  text-decoration-color: var(--accent-hover);
}

/* ---------- Page prev/next ---------- */

.page-nav-next, .page-nav-prev {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-weight: 500;
}

.page-nav-next { text-align: right; }

/* ---------- Code blocks ---------- */

div.sourceCode {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--code-bg);
  overflow-x: auto;
}

div.sourceCode pre {
  margin: 0;
  padding: 0.85rem 1rem;
}

pre code, code {
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, Menlo, monospace;
  font-size: 0.84rem;
}

pre.sourceCode {
  white-space: pre;
}

.code-copy-button {
  opacity: 0.55;
}

.code-copy-button:hover {
  opacity: 1;
}

/* ---------- R console output ---------- */

.cell-output,
.cell-output-stdout {
  position: relative;
  margin-top: -0.35rem;
}

.cell-output pre,
.cell-output-stdout pre {
  background-color: var(--output-bg);
  border: none;
  border-left: 3px solid var(--border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0.7rem 1rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.cell-output-stdout pre code {
  color: var(--text-secondary);
}

/* ---------- Figures ---------- */

.cell {
  margin-top: 1rem;
  margin-bottom: 1.75rem;
}

.cell-output-display {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.cell-output-display img,
.cell-output-display svg {
  max-width: 100%;
}

figcaption, .figure-caption {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.6rem;
}

/* leaflet / htmlwidget frames get a bit of breathing room */
.cell-output-display .leaflet,
.cell-output-display iframe {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* ---------- Tables ---------- */

.table {
  font-size: 0.86rem;
  border-collapse: collapse;
  width: 100%;
}

.table thead th {
  border-bottom: 2px solid var(--border);
  border-top: none;
  font-weight: 600;
  text-align: left;
  color: var(--text-primary);
  background-color: transparent;
}

.table td, .table th {
  border-top: none;
  border-bottom: 1px solid var(--border);
  padding: 0.55rem 0.75rem;
}

.table tbody tr:hover {
  background-color: color-mix(in srgb, var(--accent) 4%, transparent);
}

.table-responsive, div.cell-output table {
  overflow-x: auto;
  display: block;
}

/* ---------- Callouts ---------- */

.callout.callout-style-default {
  border: none !important;
  border-left: 3px solid var(--border) !important;
  border-radius: var(--radius-sm) !important;
  background-color: var(--surface) !important;
  padding: 0.9rem 1.1rem !important;
  box-shadow: none !important;
}

.callout.callout-style-default > div.callout-body-container,
.callout.callout-style-default > .callout-header {
  background-color: transparent !important;
  padding: 0 !important;
}

.callout.callout-style-default.callout-note { border-left-color: var(--accent) !important; background-color: color-mix(in srgb, var(--accent) 6%, var(--surface)) !important; }
.callout.callout-style-default.callout-tip { border-left-color: #2E8B57 !important; background-color: color-mix(in srgb, #2E8B57 6%, var(--surface)) !important; }
.callout.callout-style-default.callout-important { border-left-color: #B45309 !important; background-color: color-mix(in srgb, #B45309 6%, var(--surface)) !important; }
.callout.callout-style-default.callout-warning { border-left-color: #B42318 !important; background-color: color-mix(in srgb, #B42318 6%, var(--surface)) !important; }

.callout-icon::before {
  display: none !important;
}

.callout-title-container {
  font-weight: 600;
  font-size: 0.88rem;
}

/* ---------- Homepage hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
  padding: 2.5rem 0 3rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.hero-kicker {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.hero h1 {
  font-size: clamp(2rem, 1.6rem + 2vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.12;
  margin-bottom: 1.1rem;
}

.hero p.hero-lede {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 46ch;
  margin-bottom: 1.5rem;
}

.hero-byline {
  font-size: 0.92rem;
  margin-bottom: 1.75rem;
}

.hero-byline .name {
  font-weight: 600;
  color: var(--text-primary);
}

.hero-byline .affiliation {
  color: var(--text-secondary);
  display: block;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  background-color: var(--accent);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  transition: background-color 150ms ease, transform 150ms ease;
}

.hero-cta:hover {
  background-color: var(--accent-hover);
  transform: translateX(2px);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual svg {
  width: 100%;
  height: auto;
  max-width: 420px;
}

.hero-coords {
  position: relative;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  color: var(--text-secondary);
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 1.5rem;
  }
  .hero-visual {
    order: -1;
    max-width: 280px;
    margin: 0 auto 1rem auto;
  }
}

/* ---------- Coursework index rows ---------- */

.coursework-group {
  margin-bottom: 2.5rem;
}

.coursework-group-header {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin-bottom: 0.25rem;
}

.coursework-number {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.coursework-group-title {
  font-size: 1.15rem;
  font-weight: 650;
  margin: 0;
}

.coursework-group-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0.15rem 0 1rem 0;
}

.exercise-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0.25rem;
  border-top: 1px solid var(--border);
  text-decoration: none !important;
  color: inherit;
  transition: background-color 150ms ease, padding-left 150ms ease;
}

.coursework-group:last-child .exercise-row:last-child {
  border-bottom: 1px solid var(--border);
}

.exercise-row:hover {
  background-color: color-mix(in srgb, var(--accent) 5%, transparent);
  padding-left: 0.6rem;
}

.exercise-row-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  min-width: 4.5rem;
}

.exercise-row-title {
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}

.exercise-row-arrow {
  color: var(--text-secondary);
  transition: transform 150ms ease;
}

.exercise-row:hover .exercise-row-arrow {
  transform: translateX(3px);
  color: var(--accent);
}

/* ---------- Footer ---------- */

.page-footer {
  border-top: 1px solid var(--border) !important;
  color: var(--text-secondary);
  font-size: 0.82rem;
  padding-top: 1.5rem !important;
  padding-bottom: 1.5rem !important;
}

.page-footer strong {
  color: var(--text-primary);
}

/* ---------- Misc ---------- */

::selection {
  background-color: color-mix(in srgb, var(--accent) 25%, transparent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

@media (max-width: 767px) {
  #quarto-document-content {
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* ---------- Hero geospatial SVG ---------- */

.geo-grid-line { stroke: var(--border); stroke-width: 1; }
.geo-region { fill: var(--accent); opacity: 0.14; }
.geo-region-outline { fill: none; stroke: var(--accent); stroke-width: 1.25; opacity: 0.55; }
.geo-node { fill: var(--accent); }
.geo-node-muted { fill: var(--text-secondary); opacity: 0.5; }
.geo-line { stroke: var(--text-secondary); stroke-width: 1; opacity: 0.4; stroke-dasharray: 2 3; }

/* ---------- Take-home Exercise 1 ---------- */
/* A definition list used for stating analytical assumptions, each with the reason
   it might fail. Styled as a ruled list rather than a boxed callout, so a long run
   of them does not turn the page into a stack of cards. */

.assump {
  font-size: 0.92rem;
  border-top: 1px solid var(--border);
  padding-top: 0.9rem;
  margin: 2rem 0;
}

.assump dt {
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-top: 1.1rem;
}

.assump dd {
  margin-left: 0;
  color: var(--text-primary);
  line-height: 1.6;
}

/* Figures in this report are wider than the 780px body column; they are allowed
   to breathe without forcing the page to scroll horizontally. */
.quarto-figure, .cell-output-display { overflow-x: auto; }