:root {
  color-scheme: dark;
  --bg: #070b14;
  --panel: #101827;
  --text: #e6edf7;
  --muted: #93a4bc;
  --accent: #34d399;
  --border: #223149;
}

:root.light {
  color-scheme: light;
  --bg: #f7fafc;
  --panel: #ffffff;
  --text: #172033;
  --muted: #5f7088;
  --accent: #0f766e;
  --border: #d8e1ee;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar,
.progress {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  color: var(--muted);
}

.topbar {
  top: 0;
}

.progress {
  bottom: 0;
}

.controls {
  display: flex;
  gap: 8px;
}

button {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 8px 12px;
  font-weight: 700;
  cursor: pointer;
}

.deck {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 72px 5vw;
}

.slide {
  display: none;
  width: min(1120px, 100%);
  min-height: 620px;
  padding: 48px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 24px 80px rgb(0 0 0 / 24%);
}

.slide.active {
  display: grid;
  align-content: center;
  gap: 24px;
}

.split.active {
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
}

.diagram.active {
  align-content: start;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  max-width: 900px;
  font-size: clamp(54px, 7vw, 92px);
  line-height: 0.95;
}

h2 {
  font-size: clamp(36px, 5vw, 62px);
  line-height: 1;
}

.lede {
  max-width: 820px;
  margin: 0;
  color: var(--muted);
  font-size: 24px;
  line-height: 1.45;
}

.tiles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.tiles li {
  min-height: 96px;
  display: grid;
  place-items: center;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  background: color-mix(in srgb, var(--panel), var(--accent) 6%);
  font-size: 20px;
  font-weight: 800;
  text-align: center;
}

img {
  width: 100%;
  max-height: 460px;
  object-fit: contain;
  border-radius: 8px;
  background: #ffffff;
  padding: 12px;
}

@media (max-width: 820px) {
  .slide {
    min-height: 620px;
    padding: 28px;
  }

  .split.active,
  .tiles {
    grid-template-columns: 1fr;
  }
}