:root {
  --bg: #f8fbff;
  --ink: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-strong: #7c3aed;
  --line: #e2e8f0;
}

* {
  box-sizing: border-box;
}

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

body {
  overflow: hidden;
  background:
    linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #eef6ff 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

.top-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  width: 100vw;
  height: 5px;
  overflow: hidden;
  background: rgba(226, 232, 240, .82);
}

.top-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 420ms cubic-bezier(.22, 1, .36, 1);
}

.deck {
  position: relative;
  width: 100vw;
  height: 100dvh;
}

.slide {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: max-content minmax(0, 1fr);
  gap: clamp(14px, 2vh, 24px);
  height: 100dvh;
  padding: clamp(34px, 5vh, 58px) clamp(20px, 4.8vw, 74px) clamp(20px, 4vh, 42px);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition:
    opacity 180ms ease,
    transform 220ms ease;
}

.slide.active {
  z-index: 2;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.slide-header {
  width: 100%;
  margin: 0;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 30px;
  margin-bottom: 16px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .86);
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  box-shadow: 0 10px 26px rgba(15, 23, 42, .05);
}

h1 {
  margin: 0;
  font-size: clamp(42px, 5vw, 72px);
  font-weight: 900;
  letter-spacing: -0.055em;
  line-height: .96;
}

.subtitle {
  margin: 18px auto 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 25px);
  font-weight: 650;
  line-height: 1.35;
}

.visual {
  display: flex;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 0;
}

.visual img {
  display: block;
  width: auto;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.notes {
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 20;
  width: min(1060px, calc(100vw - 60px));
  max-height: 38vh;
  overflow: auto;
  padding: 22px 26px;
  border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 24px;
  background: rgba(15, 23, 42, .94);
  box-shadow: 0 24px 60px rgba(2, 6, 23, .35);
  color: #e2e8f0;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(24px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.notes.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.notes h2 {
  margin: 0 0 10px;
  color: #fff;
  font-size: 18px;
  letter-spacing: .01em;
}

.notes ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 22px;
}

.notes li {
  color: #cbd5e1;
  font-size: 15px;
  line-height: 1.5;
}

.notes code {
  padding: 1px 5px;
  border: 1px solid rgba(147, 197, 253, .15);
  border-radius: 6px;
  background: rgba(37, 99, 235, .16);
  color: #bfdbfe;
}

@media (max-width: 800px) {
  .slide {
    padding: 34px 24px 24px;
  }

  .visual img {
    height: 100%;
    max-width: 100%;
  }
}

@media (max-width: 1536px), (max-height: 850px) {
  .eyebrow {
    height: 28px;
    margin-bottom: 12px;
    font-size: 11px;
  }

  h1 {
    font-size: clamp(32px, 4.1vw, 56px);
  }

  .subtitle {
    margin-top: 12px;
    font-size: clamp(15px, 1.55vw, 20px);
  }
}

@media (max-height: 720px) {
  .slide {
    gap: 12px;
    padding-top: 28px;
    padding-bottom: 18px;
  }

  .eyebrow {
    height: 26px;
    margin-bottom: 10px;
    font-size: 11px;
  }

  h1 {
    font-size: clamp(30px, 6vh, 48px);
  }

  .subtitle {
    margin-top: 10px;
    font-size: clamp(14px, 2.4vh, 18px);
  }
}

@media (max-height: 560px) {
  .slide {
    padding-top: 18px;
    padding-bottom: 14px;
  }

  .eyebrow {
    display: none;
  }

  h1 {
    font-size: clamp(28px, 7vh, 42px);
  }

  .subtitle {
    font-size: clamp(14px, 3vh, 17px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .top-progress span,
  .slide,
  .notes {
    transition: none;
  }
}

@media print {
  body {
    overflow: visible;
    background: #fff;
  }

  .top-progress,
  .notes {
    display: none;
  }

  .deck {
    height: auto;
  }

  .slide {
    position: relative;
    min-height: 100vh;
    page-break-after: always;
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }
}
