html, body { height: 100%; overflow: hidden; }

.deck {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
}
.slides { position: relative; overflow: hidden; }
.slide {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  display: none;
}
.slide { touch-action: pan-y pinch-zoom; }
.slide.is-active { display: block; animation: slide-in 0.3s cubic-bezier(0.2, 0.7, 0.2, 1); }
.slide.is-active[data-enter="prev"] { animation-name: slide-in-prev; }
.slide.is-active[data-enter="none"] { animation: none; }
.slide.is-peek { display: block; }
@keyframes slide-in { from { opacity: 0; transform: translateX(28px); } }
@keyframes slide-in-prev { from { opacity: 0; transform: translateX(-28px); } }

.slide-inner {
  min-height: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: clamp(22px, 4vw, 60px) clamp(16px, 4vw, 60px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
}
.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(22px, 4vw, 56px);
  align-items: center;
}
.split.even { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.slide-inner.split { align-content: center; }
.stack { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
@media (max-width: 900px) {
  .split, .split.even { grid-template-columns: minmax(0, 1fr); align-items: start; }
}

.slide h2 { font-size: clamp(1.6rem, 2.2vw + 0.8rem, 2.6rem); max-width: 22ch; }
.slide .lead { font-size: 1.08em; color: var(--muted); max-width: 60ch; }
.slide .note { font-size: 0.92em; color: var(--muted); max-width: 60ch; }
.points { margin: 0; padding-left: 1.1em; display: grid; gap: 0.55em; max-width: 60ch; }
.points li::marker { color: var(--accent); }

.deck-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto auto;
  align-items: center;
  gap: 12px;
  padding: 8px clamp(10px, 2vw, 22px) calc(8px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: var(--paper);
}
.deck-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.85em;
  font-weight: 600;
  min-height: 44px;
  padding-right: 6px;
}
.deck-home svg { width: 20px; height: 20px; }
.deck-progress { height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; }
.deck-progress span { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.3s; }
.deck-count { font-family: var(--mono); font-size: 0.8em; color: var(--muted); min-width: 4.2em; text-align: center; }
.deck-nav {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  background: var(--panel);
  color: var(--ink);
  font-size: 1.1em;
  cursor: pointer;
  touch-action: manipulation;
}
.deck-nav.next { background: var(--ink); color: #fff; }
.deck-nav:disabled { opacity: 0.3; cursor: default; }
@media (max-width: 600px) {
  .deck-home span { display: none; }
}