/* Shared layout, reading measure, controls and accessibility. Always loaded. */
:root {
  --reading-width: calc(65ch + 40px);
  --focus-ring: #925000;
  --nav-focus-ring: #ffe3a0;
  --control-track: rgba(0, 0, 0, 0.05);
  --control-border: rgba(0, 0, 0, 0.18);
  --control-icon: #734f1c;
}

:root[data-theme="modern"] {
  color-scheme: dark;
  --focus-ring: #b5a8ff;
  --nav-focus-ring: #c9c0ff;
  --control-track: rgba(255, 255, 255, 0.08);
  --control-border: rgba(184, 174, 255, 0.3);
  --control-icon: #d3caff;
}

:root[data-theme="classic"] { color-scheme: light; }

html { scroll-padding-top: calc(var(--nav-height, 60px) + 20px); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
  border-radius: 3px;
}

.navbar a:focus-visible,
.navbar button:focus-visible { outline-color: var(--nav-focus-ring); }

.style-switcher-nav {
  position: relative;
  display: flex;
  align-items: center;
  margin-left: 0.75rem;
}

.toggle-switch {
  appearance: none;
  box-sizing: border-box;
  position: relative;
  display: inline-block;
  flex: 0 0 auto;
  width: 44px;
  height: 24px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--control-border);
  border-radius: 14px;
  background: var(--control-track);
  color: var(--control-icon);
  font: inherit;
  line-height: 1;
  cursor: pointer;
  vertical-align: middle;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.toggle-switch:hover { border-color: currentColor; }

.toggle-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ffd700, #ffa500);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform 180ms ease, background-color 180ms ease;
}

[data-theme="modern"] .toggle-slider {
  transform: translateX(20px);
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.toggle-icon {
  position: absolute;
  z-index: 1;
  top: 50%;
  width: 12px;
  height: 12px;
  transform: translateY(-50%);
  opacity: 0.65;
  pointer-events: none;
}

.toggle-icon svg { display: block; width: 100%; height: 100%; }
.toggle-icon.classic { left: 5px; }
.toggle-icon.modern { right: 5px; }
[data-theme="classic"] .toggle-icon.classic { color: #614000; opacity: 1; }
[data-theme="modern"] .toggle-icon.modern { color: #fff; opacity: 1; }

.theme-tooltip {
  position: absolute;
  z-index: 1001;
  top: calc(100% + 12px);
  right: 0;
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 5px;
  background: #292329;
  color: #fff;
  font: 400 12px/1.4 Arial, sans-serif;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 150ms ease, visibility 150ms ease;
}

.toggle-switch:hover + .theme-tooltip,
.toggle-switch:focus-visible + .theme-tooltip { opacity: 1; visibility: visible; }

/* Theme styles supply the dimensions; component structure is defined once. */
.hero-content {
  display: grid;
  grid-template-columns: var(--hero-columns);
  gap: var(--hero-gap);
  align-items: start;
}
.article-content {
  display: grid;
  grid-template-columns: var(--section-columns);
  gap: var(--section-gap);
}
.title-section h1 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 12px;
}
.title-section,
.article-content > div { min-width: 0; }
.social ul { display: flex; flex-wrap: wrap; gap: 8px 24px; list-style: none; padding: 0; margin: 0; }

.administrative-roles { margin-top: 0.75rem; }
.affiliations { margin-top: 1rem; }

.course-list { list-style: none; padding: 0; }
article .course-list { margin: 0; }

/* One reading measure for prose, teaching rows and program descriptions. */
.article-content p,
.archive-notice p,
.article-content .course-list,
#development .article-content > div > ul {
  max-width: var(--reading-width);
}

/* The archived-document notice uses the current theme's existing surfaces. */
.archive-page .container { max-width: 52rem; }
.archive-notice { margin: 0; }
.archive-notice h1 { margin: 0 0 1rem; }
.archive-actions { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; margin-top: 1.5rem; }

article .course-list li {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr) minmax(7rem, 10rem);
  gap: 0.25rem 1rem;
  align-items: baseline;
  margin: 0;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-color);
  line-height: 1.6;
}

article .course-list li:last-child { border-bottom: 0; }
article .course-list li::before { content: none; }
article .course-list li:hover { transform: none; }
.course-code { color: var(--text-primary); font-weight: 600; font-size: 0.9em; }
.course-title { min-width: 0; overflow-wrap: break-word; }
.course-term {
  color: var(--text-secondary);
  font-size: 0.875em;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.course-term-part { display: inline; overflow-wrap: normal; }
.course-year { white-space: nowrap; }

.mouse-trail {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 180ms ease, width 180ms ease, height 180ms ease;
}

.mouse-trail.is-visible { opacity: 1; }
.mouse-trail.is-pressed { width: 26px; height: 26px; }

/* The static page is immediately usable; no loading overlay is needed. */
.page-loader { display: none !important; }

body, .container, article, .navbar, .navbar-inner {
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

@media (max-width: 760px) {
  article .course-list li { grid-template-columns: 7.5rem minmax(0, 1fr); column-gap: 0.75rem; }
  .course-term { grid-column: 2; text-align: left; }
}

@media (max-width: 420px) {
  article .course-list li { grid-template-columns: 6.5rem minmax(0, 1fr); }
}

@media (hover: none), (pointer: coarse) {
  .mouse-trail { display: none; }
  .theme-tooltip { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0s !important;
    scroll-behavior: auto !important;
  }
  .particles, .mouse-trail { display: none !important; }
}