.presentation-outline {
  position: fixed;
  z-index: 30;
  bottom: 0;
  left: 0;
  padding: 10px;
  color: var(--text-primary);
  font: 14px/1.4 var(--font-body);
}

.presentation-outline [hidden],
.presentation-outline[hidden] { display: none !important; }

.presentation-outline button {
  border: 1px solid var(--border-hairline);
  border-radius: 0;
  background: var(--surface-page);
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
}

.presentation-outline .deck-outline-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 7px 10px;
  font: 12px/1.4 var(--font-mono);
}

.deck-outline-trigger svg { width: 16px; height: 16px; }

.deck-outline-panel {
  position: absolute;
  bottom: calc(100% - 10px);
  left: 10px;
  display: flex;
  flex-direction: column;
  width: min(430px, calc(100vw - 20px));
  /* Collapsing a branch must not move the panel away from the pointer. */
  height: min(580px, calc(100vh - 66px));
  height: min(580px, calc(100dvh - 66px));
  border: 1px solid var(--border-mid);
  background: var(--surface-page);
}

.deck-outline-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-hairline);
}

.deck-outline-heading h2 {
  max-width: none;
  margin: 0;
  color: var(--text-primary);
  font: 600 14px/1.3 var(--font-body);
  letter-spacing: normal;
}

.presentation-outline .deck-outline-close {
  width: 32px;
  height: 32px;
  font-size: 20px;
}

.deck-outline-tree,
.deck-outline-children { margin: 0; padding: 0; list-style: none; }

.deck-outline-tree {
  flex: 1;
  min-height: 0;
  padding: 8px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.deck-outline-children {
  margin-left: 14px;
  padding-left: 9px;
  border-left: 1px solid var(--border-hairline);
}

.deck-outline-row { display: flex; align-items: start; }

.presentation-outline .deck-outline-toggle {
  flex: 0 0 28px;
  width: 28px;
  height: 34px;
  border-color: transparent;
  background: transparent;
  font-size: 22px;
  line-height: 1;
}

.deck-outline-toggle[aria-expanded="true"] { transform: rotate(90deg); }

.deck-outline-link {
  display: flex;
  flex: 1;
  min-width: 0;
  gap: 9px;
  margin-left: 28px;
  padding: 8px 6px;
  border-left: 2px solid transparent;
  color: var(--text-primary);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.deck-outline-toggle + .deck-outline-link { margin-left: 0; font-weight: 600; }
.deck-outline-number { flex: 0 0 auto; white-space: nowrap; color: var(--text-muted); font: 11px/1.8 var(--font-mono); }
.deck-outline-link:hover { background: var(--blue-100); color: var(--blue-700); }
.deck-outline-link[aria-current="page"] { background: var(--blue-100); color: var(--blue-700); border-left-color: var(--blue-600); }
.deck-outline-link[aria-current="page"] .deck-outline-number { flex: 0 0 auto; white-space: nowrap; color: inherit; }
.presentation-outline button:hover { color: var(--blue-700); border-color: var(--blue-600); }
.presentation-outline :is(button, a):focus-visible { outline: 2px solid var(--blue-600); outline-offset: -2px; }

/* Keep the corner as a hover target without visible chrome during a talk.
   Keyboard focus reveals it too; touch devices retain their visible control. */
@media (hover: hover) {
  .presentation-outline:not(:hover):not(:has(:focus-visible)) {
    opacity: 0;
  }
}

@media (pointer: coarse) {
  .presentation-outline .deck-outline-trigger,
  .presentation-outline .deck-outline-toggle,
  .presentation-outline .deck-outline-close { min-height: 44px; min-width: 44px; }
  .deck-outline-link { min-height: 44px; align-items: center; }
}

@media print {
  .presentation-outline { display: none !important; }
}