:root {
  --background: 26 15 8;
  --foreground: 255 247 236;
  --primary: 255 113 25;
  --accent: 255 220 25;
  --muted: 90 64 48;
  --muted-foreground: 232 213 196;
  --border: 61 42 28;
  --card: 26 15 8;
  --radius: 0.65rem;
}

html,
body {
  min-height: 100%;
  margin: 0;
  background: rgb(var(--background));
  color: rgb(var(--foreground));
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.reveal {
  color: rgb(var(--foreground));
  font-size: clamp(18px, 2.15vw, 31px);
}

.reveal .slides {
  text-align: left;
}

.reveal .slides section {
  box-sizing: border-box;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  padding: clamp(1.15rem, 3.8vw, 2rem);
  padding-bottom: clamp(3rem, 7vw, 4.5rem);
  border: 1px solid rgb(var(--border) / 0.85);
  border-radius: var(--radius);
  background: rgb(var(--card) / 0.78);
  box-shadow: 0 1rem 4rem rgb(0 0 0 / 0.24);
  scrollbar-gutter: stable;
}

.pass-track-slide-copy {
  position: relative;
  z-index: 1;
}

.pass-track-slide-logo {
  margin: 0 0 1rem;
  text-align: left;
}

.pass-track-slide-logo img {
  display: block;
  width: auto;
  max-width: min(13rem, 48%);
  height: auto;
  max-height: 2.5rem;
  margin-right: auto;
  margin-left: 0;
  object-fit: contain;
}

.reveal .pass-track-slide-copy ul {
  margin: 0.65rem 0;
  padding-left: 1.25em;
}

.reveal .pass-track-slide-copy ul li {
  margin: 0.42rem 0;
  line-height: 1.48;
}

.pass-track-deck-header {
  position: fixed;
  top: max(0.75rem, env(safe-area-inset-top));
  left: clamp(9rem, 18vw, 14rem);
  right: max(0.75rem, env(safe-area-inset-right));
  z-index: 39;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-sizing: border-box;
  min-height: 3rem;
  padding: 0.56rem 0.74rem;
  border: 1px solid rgb(var(--foreground) / 0.16);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgb(var(--card) / 0.7), rgb(var(--background) / 0.44));
  box-shadow: 0 0.9rem 2.4rem rgb(0 0 0 / 0.22);
  color: rgb(var(--foreground));
  line-height: 1.08;
  backdrop-filter: blur(18px) saturate(145%);
}

.pass-track-deck-header__title,
.pass-track-deck-header__meta {
  display: grid;
  gap: 0.12rem;
}

.pass-track-deck-header__title span {
  font-size: clamp(0.78rem, 1.25vw, 1rem);
  font-weight: 700;
}

.pass-track-deck-header__title small,
.pass-track-deck-header__meta {
  color: rgb(var(--muted-foreground) / 0.9);
  font-size: clamp(0.56rem, 0.9vw, 0.72rem);
}

.pass-track-deck-header__meta {
  justify-items: end;
  text-align: right;
}

.pass-track-deck-header a,
.pass-track-calendar-note a {
  color: rgb(var(--accent));
}

.pass-track-calendar-note {
  margin-top: 1rem;
  padding: 0.62rem 0.78rem;
  border: 1px solid rgb(var(--foreground) / 0.14);
  border-radius: var(--radius);
  background: rgb(var(--background) / 0.44);
  box-shadow: 0 0.65rem 1.8rem rgb(0 0 0 / 0.18);
  color: rgb(var(--foreground) / 0.9);
  font-size: 0.56em;
  line-height: 1.25;
  backdrop-filter: blur(16px) saturate(135%);
}

.pass-track-calendar-note div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
}

.pass-track-calendar-note p {
  margin: 0.28rem 0 0;
  color: rgb(var(--muted-foreground) / 0.96);
}

.pass-track-art__caption {
  position: fixed;
  right: clamp(0.7rem, 2vw, 1.25rem);
  bottom: clamp(3.2rem, 7vw, 4.5rem);
  z-index: 35;
  display: grid;
  max-width: min(42rem, 68%);
  gap: 0.18rem;
  padding: 0.58rem 0.72rem;
  border: 1px solid rgb(var(--foreground) / 0.16);
  border-radius: 0.65rem;
  background: rgb(var(--background) / 0.48);
  box-shadow: 0 0.65rem 2rem rgb(0 0 0 / 0.2);
  color: rgb(var(--foreground) / 0.9);
  font-size: clamp(0.52rem, 1.05vw, 0.72rem);
  font-weight: 400;
  line-height: 1.28;
  text-align: right;
  backdrop-filter: blur(14px) saturate(125%);
  pointer-events: none;
}

.pass-track-art__title,
.pass-track-art__formula {
  font-weight: 500;
}

.pass-track-art__formula {
  color: rgb(var(--accent));
}

.pass-track-art__description,
.pass-track-art__source,
.pass-track-art__credit {
  color: rgb(var(--muted-foreground) / 0.88);
}

.student-media-slide {
  display: grid;
  align-content: start;
  min-height: min(62vh, 34rem);
  max-width: min(46rem, 76%);
  gap: 0.7rem;
  padding: clamp(1.1rem, 3vw, 2rem);
  border: 1px solid rgb(var(--foreground) / 0.18);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgb(var(--card) / 0.9), rgb(var(--background) / 0.68));
  box-shadow: 0 1rem 3rem rgb(var(--background) / 0.32);
}

.student-media-deck .reveal .slides section {
	border: 0;
	background: transparent;
	box-shadow: none;
}

/* Reading mode: the image bleeds behind the card. */
.student-media-deck .slide-background-content {
	background-repeat: no-repeat;
	background-color: rgb(var(--background));
	transition: background-size 280ms ease, background-position 280ms ease;
}

/* Image mode: hide the card and reveal the complete image at natural ratio. */
.student-media-deck.student-media-card-hidden .slide-background.present .slide-background-content {
	background-size: contain !important;
	background-position: center !important;
	background-color: rgb(var(--background));
}

.student-media-card-hidden .student-media-slide {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.98);
}

.student-media-card-hidden .student-media-caption {
	opacity: 0;
	visibility: hidden;
	pointer-events: none;
}

.student-media-controls {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 60;
  display: flex;
  gap: 0.45rem;
}

.student-media-controls button {
  border: 1px solid rgb(var(--foreground) / 0.2);
  border-radius: 999px;
  padding: 0.48rem 0.7rem;
  background: rgb(var(--card) / 0.68);
  color: rgb(var(--foreground));
  box-shadow: 0 0.5rem 1.5rem rgb(var(--background) / 0.22);
  backdrop-filter: blur(16px) saturate(135%);
  cursor: pointer;
}

.student-media-controls button:hover,
.student-media-controls button:focus-visible {
  background: rgb(var(--accent) / 0.22);
  outline: 2px solid rgb(var(--accent) / 0.68);
  outline-offset: 2px;
}

.student-media-slide__unit,
.student-media-slide__credit,
.student-media-slide__prompt,
.student-media-caption {
  color: rgb(var(--muted-foreground) / 0.95);
}

.student-media-slide__unit,
.student-media-slide__credit {
  margin: 0;
  font-size: 0.55em;
}

.student-media-slide__citation {
  margin: 0;
  font-size: 0.7em;
}

.student-media-slide__citation a { color: rgb(var(--accent)); }

.student-media-slide__quote {
  margin: 0.35em 0 0;
  padding: 0.35em 0.7em;
  max-width: 34rem;
  border-left: 3px solid rgb(var(--accent) / 0.85);
  background: rgb(var(--foreground) / 0.06);
  font-size: 0.72em;
  font-weight: 400;
  font-style: italic;
  line-height: 1.35;
}

.student-media-slide__quote p {
  margin: 0;
}

.student-media-slide__prompt {
  margin: 0;
  font-size: 0.76em;
  font-style: italic;
}

.student-media-caption {
	position: fixed;
	left: 1rem;
	right: 1rem;
	bottom: clamp(4.2rem, 8vw, 5.4rem);
	z-index: 35;
	display: block;
	max-width: min(58rem, calc(100% - 2rem));
	padding: 0.7rem 0.9rem;
	border-top: 1px solid rgb(var(--foreground) / 0.42);
	border: 1px solid rgb(var(--foreground) / 0.2);
	border-radius: var(--radius);
	background: linear-gradient(135deg, rgb(var(--card) / 0.9), rgb(var(--background) / 0.78));
	box-shadow: 0 0.8rem 2rem rgb(0 0 0 / 0.24);
	font-size: clamp(0.62rem, 1vw, 0.82rem);
	line-height: 1.35;
	letter-spacing: 0.015em;
	text-transform: uppercase;
	white-space: normal;
	overflow: hidden;
	text-overflow: ellipsis;
	backdrop-filter: blur(16px) saturate(135%);
}

.student-media-caption span,
.student-media-caption a {
	min-width: 0;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: normal;
}

.student-media-caption a { color: rgb(var(--accent)); }

.reveal h1,
.reveal h2,
.reveal h3 {
  color: rgb(var(--foreground));
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  line-height: 1.08;
}

.reveal h1 { font-size: clamp(1.85rem, 5.8vw, 2.7rem); }
.reveal h2 { font-size: clamp(1.4rem, 4.8vw, 2.1rem); }
.reveal h3 { font-size: clamp(1.08rem, 3.8vw, 1.55rem); }

.reveal a { color: rgb(var(--accent)); }
.reveal table {
  display: block;
  width: 100%;
  margin: 1rem 0;
  overflow-x: auto;
  border-collapse: collapse;
}
.reveal th,
.reveal td {
  min-width: 8rem;
  padding: 0.48rem 0.75rem;
  border: 1px solid rgb(var(--border));
  text-align: left;
}
.reveal th {
  background: rgb(var(--muted) / 0.82);
  font-weight: 500;
}
.reveal li { margin: 0.42rem 0; line-height: 1.48; }

.track-back {
  position: fixed;
  z-index: 40;
  background: rgb(var(--card) / 0.86);
  backdrop-filter: blur(10px);
}

.deck-logo {
  position: fixed;
  z-index: 40;
  /* No card chrome — logo floats on the fractal background */
  background: transparent;
  backdrop-filter: none;
  padding: 0;
  border-radius: 0;
  box-shadow: none;
}

.track-back {
  top: max(0.75rem, env(safe-area-inset-top));
  left: max(0.75rem, env(safe-area-inset-left));
  padding: 0.58rem 0.82rem;
  border-radius: var(--radius);
  color: rgb(var(--foreground));
  font-size: clamp(0.8rem, 2.5vw, 0.95rem);
  line-height: 1;
  text-decoration: none;
}

.deck-logo {
  left: max(0.75rem, env(safe-area-inset-left));
  bottom: max(0.75rem, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
}

.deck-logo img {
  display: block;
  width: auto;
  max-width: 11rem;
  height: clamp(1.5rem, 3.8vw, 2.2rem);
  object-fit: contain;
}

@media (max-width: 720px) {
  .pass-track-deck-header {
    top: max(3.7rem, env(safe-area-inset-top));
    left: 0.7rem;
    right: 0.7rem;
    align-items: start;
  }

  .pass-track-deck-header__meta {
    display: none;
  }

  .reveal .slides section {
    max-height: calc(100vh - 3rem);
    padding: 1rem;
    padding-bottom: 4.25rem;
  }
  .reveal ul { padding-left: 1.15em; }
  .deck-logo {
    left: 0.65rem;
    right: auto;
    bottom: 0.65rem;
  }
  .deck-logo img { max-width: 7.8rem; }
  .pass-track-art__caption {
    right: 0.7rem;
    bottom: 3.45rem;
    max-width: calc(100% - 1.4rem);
  }
}