:root {
  --bg: oklch(0.984 0.003 255);
  --ink: oklch(0.21 0.02 262);
  --ink-soft: oklch(0.42 0.02 262);
  --muted: oklch(0.55 0.015 262);
  --line: oklch(0.9 0.01 262);
  --primary: oklch(0.52 0.2 266);
  --primary-soft: oklch(0.94 0.03 266);
  --sand: oklch(0.97 0.005 255);
  --elevated: #fff;
  --dark: oklch(0.21 0.02 262);
  --w: 1280px;
  --h: 720px;
  --font: 'Archivo', ui-sans-serif, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--dark);
  font-family: var(--font);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

.deck {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.slide {
  position: absolute;
  width: var(--w);
  height: var(--h);
  background: var(--elevated);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s;
  display: flex;
  flex-direction: column;
  padding: 56px 72px 48px;
}

.slide.active {
  opacity: 1;
  visibility: visible;
}

.slide::after {
  content: attr(data-num);
  position: absolute;
  right: 32px;
  bottom: 22px;
  font-size: 13px;
  color: var(--muted);
}

.slide.center { justify-content: center; }

.slide.dark {
  background: var(--dark);
  color: #fff;
}

.slide.dark .kicker { color: color-mix(in oklab, var(--primary) 80%, white); }
.slide.dark .lead,
.slide.dark p { color: rgb(255 255 255 / 72%); }
.slide.dark .card {
  background: rgb(255 255 255 / 6%);
  border-color: rgb(255 255 255 / 12%);
  color: #fff;
}
.slide.dark .card p { color: rgb(255 255 255 / 68%); }

.title-slide {
  background:
    radial-gradient(ellipse 70% 50% at 80% 10%, color-mix(in oklab, var(--primary) 28%, transparent), transparent 55%),
    var(--dark);
  color: #fff;
  justify-content: space-between;
}

.title-slide .kicker { color: color-mix(in oklab, var(--primary) 70%, white); }
.title-slide .lead { color: rgb(255 255 255 / 72%); max-width: 34rem; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand .logo {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

.kicker {
  margin: 0 0 0.65rem;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0 0 1rem;
  font-size: 3.2rem;
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h2 {
  margin: 0 0 1rem;
  font-size: 2.35rem;
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.15;
  max-width: 22ch;
}

h2 b { color: var(--primary); }
.slide.dark h2 b { color: color-mix(in oklab, var(--primary) 75%, white); }

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  font-weight: 650;
}

.lead {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1.55;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.grow { flex: 1; }

.card {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--elevated);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.45;
}

.icon {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.65rem;
  border-radius: 8px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.85rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.step {
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--sand);
}

.step .num {
  display: inline-grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  margin-bottom: 0.65rem;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}

.step .time {
  display: inline-block;
  margin-top: 0.75rem;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 650;
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
}

.compare ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.compare li + li { margin-top: 0.4rem; }

.shot {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--sand);
  box-shadow: 0 18px 48px oklch(0.21 0.02 262 / 0.1);
}

.shot img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top left;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 650;
}

.nav, .progress {
  position: fixed;
  z-index: 20;
  color: #fff;
  font-family: var(--font);
}

.nav {
  right: 24px;
  bottom: 24px;
  display: flex;
  gap: 0.5rem;
}

.nav button {
  appearance: none;
  border: 1px solid rgb(255 255 255 / 25%);
  background: rgb(0 0 0 / 35%);
  color: #fff;
  border-radius: 8px;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}

.progress {
  left: 24px;
  bottom: 28px;
  font-size: 0.85rem;
  opacity: 0.7;
}

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