:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f2f4;
  --ink: #13294b;
  --muted: #707372;
  --accent: #ff5f05;
  --accent-2: #c84113;
  --shadow: 0 14px 35px rgba(19, 41, 75, 0.14);
  --radius: 14px;
}

body {
  position: relative;
  isolation: isolate;
  color: var(--ink);
  background: var(--bg);
  font-family: "Avenir Next", "Segoe UI", "Trebuchet MS", sans-serif;
  line-height: 1.65;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58rem 34rem at 12% -10%, rgba(19, 41, 75, 0.2), transparent 64%),
    radial-gradient(50rem 30rem at 88% 0%, rgba(255, 95, 5, 0.18), transparent 66%),
    linear-gradient(180deg, #f8fafd 0%, #f3f5f8 52%, #eef1f6 100%);
}

.nav-footer {
  background-color: transparent;
}

/* Make article pages wider while preserving responsive behavior. */
.page-layout-article main.content {
  max-width: min(1400px, 96vw);
}

/* Keep side-by-side code panes at equal height with independent scrolling. */
.sync-code-panels div.sourceCode pre.sourceCode {
  min-height: 320px;
  max-height: 320px;
  overflow: auto;
}

/* Language tabs and code blocks for paired R/Python lecture examples. */
.panel-tabset {
  --uiuc-blue-soft: rgba(19, 41, 75, 0.08);
  --uiuc-blue-border: rgba(19, 41, 75, 0.24);
  --uiuc-orange-soft: rgba(255, 95, 5, 0.10);
  --uiuc-orange-border: rgba(255, 95, 5, 0.28);
}

.panel-tabset .nav-tabs {
  display: flex;
  border-bottom: 0;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.panel-tabset .nav-tabs .nav-item {
  flex: 1 1 0;
}

.panel-tabset .nav-tabs .nav-link {
  border-radius: 999px;
  border: 1px solid rgba(19, 41, 75, 0.12);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  width: 100%;
}

.lang-tab-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
}

.lang-tab-icon-r {
  color: #13294b;
}

.lang-tab-icon-python {
  color: #c84113;
}

.lang-tab-logo {
  display: inline-block;
  width: 1.05rem;
  height: 1.05rem;
  object-fit: contain;
}

.lang-tab-logo-r {
  width: 1.12rem;
  height: 1.12rem;
}

.lang-tab-logo-python {
  width: 1.12rem;
  height: 1.12rem;
}

.panel-tabset .nav-tabs .nav-link.active,
.panel-tabset .nav-tabs .nav-link:hover,
.panel-tabset .nav-tabs .nav-link:focus {
  color: var(--ink);
}

.panel-tabset .nav-tabs li:first-child .nav-link.active,
.panel-tabset .nav-tabs li:first-child .nav-link:hover,
.panel-tabset .nav-tabs li:first-child .nav-link:focus {
  background: var(--uiuc-blue-soft);
  border-color: var(--uiuc-blue-border);
}

.panel-tabset .nav-tabs li:last-child .nav-link.active,
.panel-tabset .nav-tabs li:last-child .nav-link:hover,
.panel-tabset .nav-tabs li:last-child .nav-link:focus {
  background: var(--uiuc-orange-soft);
  border-color: var(--uiuc-orange-border);
}

.panel-tabset .code-copy-outer-scaffold {
  border-radius: 12px;
}

.panel-tabset pre.sourceCode {
  border-radius: 12px;
  border: 1px solid rgba(17, 37, 58, 0.1);
  box-shadow: 0 10px 24px rgba(19, 41, 75, 0.08);
}

.panel-tabset pre.sourceCode.r,
.panel-tabset pre.sourceCode.r code.sourceCode {
  background: linear-gradient(180deg, rgba(19, 41, 75, 0.06), rgba(29, 88, 167, 0.05));
}

.panel-tabset pre.sourceCode.python,
.panel-tabset pre.sourceCode.python code.sourceCode {
  background: linear-gradient(180deg, rgba(255, 95, 5, 0.09), rgba(200, 65, 19, 0.06));
}

main.content a:not(.btn-hero):not(.btn-ghost) {
  color: #ff5f05;
}

main.content a:not(.btn-hero):not(.btn-ghost):hover,
main.content a:not(.btn-hero):not(.btn-ghost):focus {
  color: #c84113;
}

.navbar {
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(17, 37, 58, 0.08);
}

.navbar .navbar-brand,
.navbar .navbar-title,
.navbar .nav-link,
.navbar .nav-link .menu-text,
.navbar .nav-link i {
  color: var(--ink) !important;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus {
  color: var(--accent) !important;
}

.navbar .nav-link[href*="canvas.illinois.edu"] .menu-text {
  font-weight: 800;
}

.navbar .nav-link[href*="canvas.illinois.edu"] i {
  color: var(--accent) !important;
}

.navbar-nav {
  margin: 0 auto;
}

.quarto-title-banner {
  background: linear-gradient(118deg, rgba(19, 41, 75, 0.84) 0%, rgba(29, 88, 167, 0.78) 48%, rgba(255, 95, 5, 0.72) 100%);
  color: #ffffff;
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow);
}

.quarto-title-banner h1.title {
  color: #ffffff;
}

.quarto-title-banner .subtitle {
  color: rgba(255, 255, 255, 0.94);
}

h1,
h2,
h3 {
  letter-spacing: 0.2px;
}

.hero {
  background: linear-gradient(132deg, rgba(19, 41, 75, 0.82), rgba(29, 88, 167, 0.7));
  border-radius: var(--radius);
  color: #ffffff;
  padding: 1.25rem 1.4rem;
  margin-bottom: 1.4rem;
  box-shadow: var(--shadow);
}

.hero .hero-more {
  margin-top: 0.7rem;
}

.hero .hero-more summary {
  cursor: pointer;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.95);
}

.hero .hero-more[open] {
  margin-bottom: 0.5rem;
}

.hero-actions {
  margin-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn-hero,
.btn-ghost {
  display: inline-block;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn-hero {
  background: rgba(255, 95, 5, 0.8);
  color: #ffffff;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.75);
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
  margin: 1rem 0 1.2rem;
}

.card-block {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid rgba(17, 37, 58, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.95rem;
}

.card-block h3 {
  margin-top: 0;
  color: #13294b;
}

table {
  background: var(--surface);
  border-radius: 8px;
  overflow: hidden;
}

@media (max-width: 700px) {
  body {
    font-size: 0.97rem;
  }

  .sync-code-panels div.sourceCode pre.sourceCode {
    min-height: 220px;
    max-height: 220px;
  }

  .hero {
    padding: 1rem;
  }
}