:root {
  color-scheme: light;
  --slide-bg: #fbfaf7;
  --slide-text: #171717;
  --slide-muted: #5d5d5d;
  --slide-accent: #2457a6;
  --slide-border: #dedbd2;
  --slide-code-bg: #f1efe9;
  --slide-shadow: rgba(23, 23, 23, 0.08);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }

body.presentation-body {
  margin: 0;
  background: var(--slide-bg);
  color: var(--slide-text);
  font-family: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  line-height: 1.45;
}

.presentation-shell { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; }
.presentation-topbar, .presentation-footer {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1rem 1.4rem; color: var(--slide-muted); font-size: .95rem;
}
.presentation-topbar a { color: var(--slide-accent); text-decoration: none; font-weight: 700; }
.slide-counter { font-variant-numeric: tabular-nums; }
.deck { position: relative; min-height: 0; }
.slide { display: none; min-height: calc(100vh - 7.2rem); padding: clamp(2rem, 5vw, 5rem); place-items: center; }
.slide.is-active { display: grid; }
.slide-content { width: min(1120px, 100%); }
.slide-kicker { margin: 0 0 1rem; color: var(--slide-accent); font-size: clamp(1rem, 1.8vw, 1.35rem); font-weight: 800; }
.slide h1, .slide h2 { margin: 0; max-width: 17ch; font-weight: 850; line-height: 1.04; }
.slide h1 { font-size: clamp(3rem, 7vw, 6.4rem); }
.slide h2 { font-size: clamp(2.4rem, 5.4vw, 5rem); }
.slide p, .slide li { max-width: 64ch; font-size: clamp(1.45rem, 2.25vw, 2.2rem); }
.slide p { margin: 1.4rem 0 0; }
.slide ul, .slide ol { display: grid; gap: 1rem; margin: 1.8rem 0 0; padding-left: 1.4em; }
.fragment { opacity: 0; transform: translateY(10px); transition: opacity 180ms ease, transform 180ms ease; }
.fragment.is-visible { opacity: 1; transform: translateY(0); }
.fragment.is-dimmed { color: #8a8a8a; }
.code-block {
  display: block; width: min(900px, 100%); margin: 2rem 0 0; padding: 1.4rem;
  border: 1px solid var(--slide-border); border-radius: 10px; background: var(--slide-code-bg);
  color: var(--slide-text); font: clamp(1.25rem, 2vw, 1.95rem)/1.35 "SFMono-Regular", Consolas, monospace;
  overflow-x: auto; box-shadow: 0 14px 34px var(--slide-shadow);
}
.code-block.compact-code { font-size: clamp(1rem, 1.5vw, 1.45rem); }
.code-step { margin-top: 1.2rem; }
.code-step .code-block { margin-top: 0; }
.code-step p { margin-top: .75rem; font-size: clamp(1.1rem, 1.7vw, 1.55rem); color: var(--slide-muted); }
.two-column { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(1.5rem, 4vw, 4rem); align-items: start; }
.two-column.diagram-emphasis { grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr); align-items: center; }
.diagram-emphasis .slide-figure img { width: 100%; max-height: 62vh; object-fit: contain; }
.prompt-card { margin-top: 2rem; padding: 1.4rem; border: 1px solid var(--slide-border); border-radius: 12px; background: #fff; }
.prompt-card p { margin-top: .6rem; font-size: clamp(1.1rem, 1.7vw, 1.35rem); }
.presentation-index-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.presentation-index-card { margin-top: 0; padding: 1rem 1.15rem; }
.presentation-index-card h2 { font-size: clamp(1.35rem, 2vw, 1.8rem); }
.presentation-index-card p { margin-top: .4rem; font-size: clamp(1rem, 1.35vw, 1.15rem); }
.presentation-index-card a { color: var(--slide-accent); font-weight: 700; }
.slide-figure { margin: 1.5rem 0 0; }
.slide-figure img { display: block; max-width: 100%; max-height: 48vh; border: 1px solid var(--slide-border); border-radius: 10px; box-shadow: 0 14px 34px var(--slide-shadow); }
.slide-figure figcaption { margin-top: .55rem; color: var(--slide-muted); font-size: clamp(.9rem, 1.3vw, 1.15rem); }
.comparison { width: 100%; margin-top: 2rem; border-collapse: collapse; background: #fff; font-size: clamp(1rem, 1.6vw, 1.45rem); }
.comparison th, .comparison td { padding: 1rem; border: 1px solid var(--slide-border); text-align: left; vertical-align: top; }
.comparison th { color: var(--slide-accent); }
.flow { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; margin-top: 2rem; }
.flow span { padding: .8rem 1rem; border: 2px solid var(--slide-text); border-radius: 10px; background: #fff; font-size: clamp(1rem, 1.5vw, 1.35rem); font-weight: 800; }
.flow b { color: var(--slide-accent); font-size: 1.8rem; }
.decision-simulator { display: grid; grid-template-columns: minmax(15rem, .8fr) minmax(0, 1.2fr); gap: 1.5rem; margin-top: 1.5rem; align-items: start; }
.decision-controls, .decision-output { display: grid; gap: .8rem; padding: 1.2rem; border: 1px solid var(--slide-border); border-radius: 10px; background: #fff; }
.decision-controls label { font-size: 1.15rem; font-weight: 700; }
.decision-controls input { width: 100%; padding: .7rem; border: 1px solid var(--slide-border); border-radius: 6px; font: inherit; font-size: 1.1rem; }
.decision-controls button { padding: .7rem 1rem; border: 0; border-radius: 6px; background: var(--slide-accent); color: #fff; font: inherit; font-weight: 800; cursor: pointer; }
.decision-output pre { min-height: 5rem; margin: 0; white-space: pre-wrap; font: 1.1rem/1.5 "SFMono-Regular", Consolas, monospace; }

@media (max-width: 760px) {
  .two-column { grid-template-columns: 1fr; }
  .two-column.diagram-emphasis { grid-template-columns: 1fr; }
  .decision-simulator { grid-template-columns: 1fr; }
  .presentation-topbar, .presentation-footer { align-items: flex-start; flex-direction: column; }
  .slide { min-height: calc(100vh - 9rem); padding: 1.5rem; }
  .slide p, .slide li { font-size: clamp(1.15rem, 4.3vw, 1.65rem); }
}