:root {
  --color-bg: #ffffff;
  --color-fg: #1a1a1a;
  --color-accent: #3b5bdb;
  --color-muted: #6b7280;
  --color-border: #e2e2e2;
  --color-code-bg: #f4f4f5;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  --font-size-sm: 0.85rem;
  --font-size-base: 1.25rem;
  --font-size-lg: 1.75rem;
  --font-size-xl: 2.5rem;
  --font-size-xxl: 3.25rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #16171a;
    --color-fg: #f2f2f2;
    --color-accent: #7c9bff;
    --color-muted: #9ca3af;
    --color-border: #33353a;
    --color-code-bg: #222327;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
}

section.slide {
  display: flex;
  position: fixed;
  inset: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  padding: var(--spacing-xl);
  overflow: auto;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 200ms ease, visibility 0s linear 200ms;
}

section.slide.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 200ms ease, visibility 0s linear 0s;
}

@media (prefers-reduced-motion: reduce) {
  section.slide {
    transition: none;
  }
}

.fragment {
  opacity: 0;
  transition: opacity 200ms ease;
}

.fragment.fragment-visible {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .fragment {
    transition: none;
  }
}

section.slide > * {
  max-width: 50rem;
  width: 100%;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.2;
  margin: 0 0 var(--spacing-md);
}

h1 {
  font-size: var(--font-size-xxl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

p,
ul,
ol,
table,
blockquote,
pre {
  margin: 0 0 var(--spacing-md);
}

ul,
ol {
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

blockquote {
  margin-left: 0;
  padding: var(--spacing-sm) var(--spacing-md);
  border-left: 0.25rem solid var(--color-accent);
  color: var(--color-muted);
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.85em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 0.25em;
}

pre {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  background: var(--color-code-bg);
  padding: var(--spacing-md);
  border-radius: 0.5em;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
}

pre.mermaid {
  background: none;
  padding: 0;
  display: flex;
  justify-content: center;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  text-align: left;
}

th {
  background: var(--color-code-bg);
}

.notes {
  display: none;
}

.nav-zone {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 15%;
  z-index: 1;
  cursor: pointer;
}

.nav-zone.prev {
  left: 0;
}

.nav-zone.next {
  right: 0;
}

.nav-button {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-code-bg);
  color: var(--color-fg);
  font-size: var(--font-size-base);
  line-height: 1;
  cursor: pointer;
}

.nav-button.prev {
  left: var(--spacing-md);
}

.nav-button.next {
  right: var(--spacing-md);
}

.progress {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 2;
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

body.grid-mode {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: var(--spacing-md);
  height: auto;
  min-height: 100%;
  padding: var(--spacing-lg);
  align-content: start;
}

body.grid-mode .nav-zone,
body.grid-mode .nav-button,
body.grid-mode .progress {
  display: none;
}

body.grid-mode section.slide {
  position: relative;
  display: block;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: none;
  width: auto;
  height: 12rem;
  padding: var(--spacing-sm);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 0.5em;
  cursor: pointer;
}

body.grid-mode section.slide.active {
  outline: 3px solid var(--color-accent);
}

body.grid-mode section.slide::before {
  content: attr(data-slide);
  position: absolute;
  top: 0.4rem;
  left: 0.4rem;
  z-index: 1;
  background: var(--color-accent);
  color: #fff;
  font-size: var(--font-size-sm);
  line-height: 1;
  padding: 0.2em 0.5em;
  border-radius: 0.25em;
}

body.grid-mode section.slide > * {
  transform: scale(0.35);
  transform-origin: top left;
  max-width: none;
  width: 285%;
}

body.grid-mode .fragment {
  opacity: 1;
}

@page {
  size: landscape;
  margin: 0;
}

@media print {
  .nav-zone,
  .nav-button,
  .progress {
    display: none !important;
  }

  section.slide {
    position: static;
    opacity: 1;
    visibility: visible;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    break-after: page;
    page-break-after: always;
  }

  section.slide:last-of-type {
    break-after: auto;
    page-break-after: auto;
  }

  .fragment {
    opacity: 1;
  }
}