/*
 * SITE DESIGN CONTROLS
 * Change the values in this first block to restyle the whole website.
 * Detailed guidance is in SITE_CUSTOMIZATION.md.
 */
:root {
  --site-primary: #315c8c;
  --site-primary-dark: #234365;
  --site-accent: #e8f1f8;
  --site-surface: #ffffff;
  --site-text: #243142;
  --site-muted: #617084;
  --site-border: #dce4ec;

  --site-font: system-ui, -apple-system, "Segoe UI", sans-serif;
  --site-heading-font: var(--site-font);

  --site-content-width: 1180px;
  --site-radius: 0.7rem;
  --site-shadow: 0 0.25rem 1rem rgb(31 51 73 / 8%);
}

/* Typography */
body {
  color: var(--site-text);
  font-family: var(--site-font);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--site-primary-dark);
  font-family: var(--site-heading-font);
}

.page-columns {
  max-width: var(--site-content-width);
}

/* Top navigation */
.navbar {
  background: var(--site-primary);
  box-shadow: 0 1px 0 rgb(0 0 0 / 8%);
}

.navbar .navbar-brand,
.navbar .nav-link {
  color: #fff;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar .nav-link.active {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 0.3rem;
}

/* Institutional marks shown in the upper corners of every Quarto page. */
.site-corner-logos {
  position: fixed;
  inset: 0;
  z-index: 1030;
  pointer-events: none;
  --snake-width: clamp(5.5rem, 10vw, 8.5rem);
  --snake-inset: 0.75rem;
  --snake-top: 4.1rem;
  --snake-bottom: calc(100% - 6.3rem);
}

.site-corner-logos::before,
.site-corner-logos::after {
  position: absolute;
  top: 4.1rem;
  display: block;
  content: "";
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  filter: drop-shadow(0 1px 1px rgb(0 0 0 / 15%));
}

.site-corner-logos::before {
  left: 0.75rem;
  width: clamp(3.5rem, 6vw, 5.25rem);
  aspect-ratio: 1;
  background-image: url("assets/site/school-logo.png");
}

.site-corner-logos::after {
  left: calc(100% - var(--snake-width) - var(--snake-inset));
  width: var(--snake-width);
  aspect-ratio: 472 / 281;
  background-image: url("assets/site/uzh.png");
  /* Paused for now; restore `site-snake-border 28s linear infinite` to re-enable. */
  animation: none;
  transform-origin: center;
  will-change: left, top, transform;
}

/* Move the UZH mark clockwise around the page edge, like a slithering snake. */
@keyframes site-snake-border {
  0%,
  100% {
    left: calc(100% - var(--snake-width) - var(--snake-inset));
    top: var(--snake-top);
    transform: rotate(0deg);
  }

  25% {
    left: calc(100% - var(--snake-width) - var(--snake-inset));
    top: var(--snake-bottom);
    transform: rotate(90deg);
  }

  50% {
    left: var(--snake-inset);
    top: var(--snake-bottom);
    transform: rotate(180deg);
  }

  75% {
    left: var(--snake-inset);
    top: var(--snake-top);
    transform: rotate(270deg);
  }
}

/* Reusable content card: ::: {.site-card} ... ::: */
.site-card {
  height: 100%;
  padding: 1.25rem;
  background: var(--site-surface);
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius);
  box-shadow: var(--site-shadow);
}

.site-card > :last-child {
  margin-bottom: 0;
}

/* Reusable highlighted panel: ::: {.site-highlight} ... ::: */
.site-highlight {
  margin-block: 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--site-accent);
  border-left: 0.3rem solid var(--site-primary);
  border-radius: var(--site-radius);
}

/* Interactive code cells */
.exercise-cell {
  overflow: hidden;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius);
}

/* Inline viewers generated for uploaded HTML and PDF documents. */
.embedded-document {
  display: block;
  width: 100%;
  min-height: 78vh;
  margin-top: 1rem;
  background: #fff;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius);
  box-shadow: var(--site-shadow);
}

.embedded-pdf {
  min-height: 82vh;
}

/* Remove this media block if you want identical desktop/mobile spacing. */
@media (max-width: 768px) {
  :root {
    --site-radius: 0.45rem;
  }

  .site-corner-logos {
    --snake-width: 5.25rem;
    --snake-inset: 0.35rem;
    --snake-top: 3.8rem;
    --snake-bottom: calc(100% - 4.25rem);
  }

  .site-card,
  .site-highlight {
    padding: 1rem;
  }

  .site-corner-logos::before,
  .site-corner-logos::after {
    top: 3.8rem;
  }

  .site-corner-logos::before {
    left: 0.35rem;
    width: 3.25rem;
  }

  .site-corner-logos::after {
    width: 5.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-corner-logos::after {
    animation: none;
    left: calc(100% - var(--snake-width) - var(--snake-inset));
    top: var(--snake-top);
    transform: none;
  }
}