:root,
html[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0e0b14;
  --color-bg-deep: #09070e;
  --color-surface: #171225;
  --color-ink: #f4f0ff;
  --color-ink-dim: #b4a8c9;
  --color-line: #3d3354;
  --color-accent: #a78bfa;
  --color-accent-deep: #7c3aed;
  --color-code-bg: #120e1c;
  --color-track: rgb(244 240 255 / 0.08);
  --color-section-mix: #2a1848;
  --color-section-ink: #f8f4ff;
  --shadow-deck: 0 28px 80px rgb(76 29 149 / 0.35);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2.25rem;
  --space-7: 3.25rem;
  --space-8: 4.5rem;
  --pad: clamp(2.1rem, 5.4vw, 4.6rem);
  --radius: 0.85rem;
  --slide-w: 16;
  --slide-h: 9;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI",
    "Yu Gothic", "Noto Sans JP", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas,
    monospace;
  --fs-display: clamp(2.5rem, 5.8vw, 4.4rem);
  --fs-section: clamp(2.2rem, 5.2vw, 3.8rem);
  --fs-h1: clamp(1.7rem, 3.4vw, 2.45rem);
  --fs-h2: clamp(1.2rem, 2.2vw, 1.55rem);
  --fs-body: clamp(1.05rem, 1.7vw, 1.32rem);
  --fs-caption: clamp(0.85rem, 1.3vw, 1rem);
  --lh-heading: 1.35;
  --lh-body: 1.75;
  --track-heading: 0.04em;
  --track-body: 0.02em;
}

html[data-theme="light"] {
  color-scheme: light;
  --color-bg: #f6f2fb;
  --color-bg-deep: #e4dcf2;
  --color-surface: #ffffff;
  --color-ink: #1b1328;
  --color-ink-dim: #5c5270;
  --color-line: #d9d0ea;
  --color-accent: #7c3aed;
  --color-accent-deep: #5b21b6;
  --color-code-bg: #ece6f6;
  --color-track: rgb(27 19 40 / 0.1);
  --color-section-mix: #4c1d95;
  --color-section-ink: #f8f4ff;
  --shadow-deck: 0 24px 80px rgb(76 29 149 / 0.14);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--color-bg-deep);
  color: var(--color-ink);
  font-family: var(--font);
}

body {
  letter-spacing: var(--track-body);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.slide-body {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--track-body);
}

.slide-body h1,
.slide-body h2,
.slide-body h3 {
  font-weight: 700;
  line-height: var(--lh-heading);
  letter-spacing: var(--track-heading);
  margin: 0 0 var(--space-4);
}

.slide-body h1 {
  font-size: var(--fs-h1);
}

.slide-body h2 {
  font-size: var(--fs-h2);
  color: var(--color-ink);
}

.slide-body h3 {
  font-size: var(--fs-body);
}

.slide-body p,
.slide-body ul,
.slide-body ol,
.slide-body table,
.slide-body pre {
  margin: 0 0 var(--space-4);
}

.slide-body > :last-child {
  margin-bottom: 0;
}

.slide-body ul,
.slide-body ol {
  padding-left: 1.3em;
}

.slide-body li + li {
  margin-top: 0.35em;
}

.slide-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95em;
}

.slide-body th,
.slide-body td {
  text-align: left;
  padding: 0.55em 0.7em;
  border-bottom: 1px solid var(--color-line);
}

.slide-body th {
  color: var(--color-ink-dim);
  font-weight: 600;
}

.slide-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0;
}

.slide-body :not(pre) > code {
  background: var(--color-surface);
  border-radius: 0.3em;
  padding: 0.1em 0.35em;
}

.slide-body pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-5);
  overflow: auto;
  font-size: 0.86em;
  line-height: 1.55;
}

.slide-body pre code {
  font-size: inherit;
  background: none;
  padding: 0;
}

.slide-body blockquote {
  margin: 0;
  font-size: 1.35em;
  line-height: 1.6;
  letter-spacing: 0.03em;
  font-weight: 600;
}

.slide-body blockquote p {
  margin: 0;
}

.speaker-notes {
  display: none;
}

.stage-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.deck {
  width: min(100vw, calc(100vh * 16 / 9));
  height: min(100vh, calc(100vw * 9 / 16));
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
  box-shadow: var(--shadow-deck);
}

.slide {
  position: absolute;
  inset: 0;
  display: none;
  padding: var(--pad);
}

.slide.is-active,
.deck.is-overview .slide {
  display: flex;
}

.slide[hidden] {
  display: none !important;
}

.slide-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.slide[data-type="cover"] {
  background:
    radial-gradient(
      70rem 28rem at 92% -8%,
      color-mix(in srgb, var(--color-accent) 30%, transparent),
      transparent 58%
    ),
    var(--color-bg);
  box-shadow: inset 0.55rem 0 0 var(--color-accent);
}

.slide[data-type="cover"] .slide-body {
  justify-content: flex-end;
  gap: var(--space-4);
}

.slide[data-type="cover"] h1 {
  font-size: var(--fs-display);
  max-width: 14em;
  margin: 0;
}

.slide[data-type="cover"] h1 + p,
.slide[data-type="cover"] h2 {
  color: var(--color-ink-dim);
  font-size: var(--fs-h2);
  font-weight: 500;
  margin: 0;
}

.slide[data-type="section"] {
  background:
    linear-gradient(
      135deg,
      color-mix(in srgb, var(--color-accent) 88%, var(--color-section-mix)),
      var(--color-accent-deep)
    );
  color: var(--color-section-ink);
}

.slide[data-type="section"] .slide-body {
  justify-content: flex-end;
}

.slide[data-type="section"] h1 {
  font-size: var(--fs-section);
  margin: 0;
  color: inherit;
}

.slide[data-type="body"] h1 {
  display: inline-block;
  padding-bottom: 0.45em;
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-repeat: no-repeat;
  background-size: 100% 0.16em;
  background-position: 0 100%;
}

.slide[data-type="split"] .slide-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: stretch;
}

.split-pane {
  min-width: 0;
  padding-right: var(--space-4);
}

.split-pane + .split-pane {
  padding-right: 0;
  padding-left: var(--space-4);
  border-left: 1px solid var(--color-line);
}

.slide[data-type="quote"] .slide-body {
  justify-content: center;
  max-width: 18em;
}

.slide[data-type="quote"] blockquote::before {
  content: "“";
  display: block;
  font-size: 3.4rem;
  line-height: 0.7;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.slide[data-type="quote"] blockquote + p {
  margin-top: var(--space-5);
  color: var(--color-ink-dim);
  font-size: var(--fs-caption);
  font-weight: 500;
}

.slide[data-type="code"] .slide-body {
  gap: var(--space-3);
}

.slide[data-type="code"] h1,
.slide[data-type="code"] h2 {
  flex: 0 0 auto;
}

.slide[data-type="code"] pre {
  flex: 1;
  margin: 0;
  font-size: 0.95em;
}

.slide[data-type="figure"] .slide-body {
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: var(--space-4);
}

.slide[data-type="figure"] img {
  max-height: 68%;
  width: auto;
  object-fit: contain;
}

.slide[data-type="figure"] p {
  color: var(--color-ink-dim);
  font-size: var(--fs-caption);
  margin: 0;
}

.deck.is-overview {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: var(--space-4);
  padding: var(--space-5);
  overflow: auto;
  box-shadow: none;
}

.deck.is-overview .slide {
  position: relative;
  display: flex;
  inset: auto;
  aspect-ratio: 16 / 9;
  height: auto;
  cursor: pointer;
  outline: 1px solid var(--color-line);
  font-size: 0.42em;
}

.deck.is-overview .slide.is-active {
  outline: 2px solid var(--color-accent);
}