.presentation-host-page {
  width: min(1180px, calc(100% - 2rem));
  margin: 2rem auto;
}

.presentation-preview-notice {
  margin-bottom: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid #1c8ef9;
  border-radius: 12px;
  background: color-mix(in srgb, #1c8ef9 10%, #f8fafc);
  color: #0b132b;
}

.presentation {
  --presentation-ink: #0b132b;
  --presentation-accent: #1c8ef9;
  --presentation-aqua: #4fd1c5;
  --presentation-border: #e2e8f0;
  --presentation-bg: #f8fafc;
  color: var(--presentation-ink);
}

.presentation__shell {
  overflow: hidden;
  border: 1px solid var(--presentation-border);
  border-radius: 24px;
  background: var(--presentation-bg);
  box-shadow: 0 20px 55px rgb(11 19 43 / 12%);
}

.presentation--fullscreen {
  position: fixed;
  inset: 0;
  z-index: 10000;
  overflow: auto;
  background: var(--presentation-bg);
}

.presentation--fullscreen .presentation__shell {
  min-height: 100vh;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.presentation__header,
.presentation__navigation,
.presentation__presenter-controls,
.presentation__progress-copy,
.presentation__utility-actions,
.presentation__completion-actions {
  display: flex;
  align-items: center;
}

.presentation__header {
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.4rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--presentation-border);
}

.presentation__header h1 {
  margin: 0;
  font-size: clamp(1.25rem, 2.4vw, 2rem);
}

.presentation__description {
  max-width: 68ch;
  margin: 0.35rem 0 0;
}

.presentation__eyebrow,
.presentation__scene-number {
  margin: 0 0 0.35rem;
  color: #31536f;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.presentation__utility-actions,
.presentation__completion-actions {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.6rem;
}

.presentation__progress-block {
  padding: 0.8rem clamp(1rem, 4vw, 3rem) 0;
}

.presentation__progress-copy {
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.4rem;
  color: #31536f;
  font-size: 0.9rem;
}

.presentation__progress-block progress {
  display: block;
  width: 100%;
  height: 0.45rem;
  overflow: hidden;
  border: 0;
  border-radius: 999px;
  background: var(--presentation-border);
  accent-color: var(--presentation-accent);
}

.presentation__progress-block progress::-webkit-progress-bar { background: var(--presentation-border); }
.presentation__progress-block progress::-webkit-progress-value { background: linear-gradient(90deg, var(--presentation-accent), var(--presentation-aqua)); }
.presentation__progress-block progress::-moz-progress-bar { background: linear-gradient(90deg, var(--presentation-accent), var(--presentation-aqua)); }

.presentation__analytics-note {
  margin: 0.45rem 0 0;
  color: #31536f;
  font-size: 0.78rem;
}

.presentation__presenter-controls {
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.9rem clamp(1rem, 4vw, 3rem) 0;
}

.presentation__scenes {
  min-height: clamp(360px, 52vh, 620px);
}

.presentation__scene {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  max-width: 1000px;
  min-height: clamp(360px, 52vh, 620px);
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 4rem);
}

.presentation__scene[hidden] { display: none; }

.presentation__scene h2 {
  max-width: 23ch;
  margin: 0 0 1rem;
  font-size: clamp(1.8rem, 5vw, 3.8rem);
  line-height: 1.08;
}

.presentation__body {
  max-width: 72ch;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  line-height: 1.65;
}

.presentation__body blockquote {
  margin: 1.5rem 0;
  padding: 0.8rem 1.2rem;
  border-left: 5px solid var(--presentation-aqua);
  background: color-mix(in srgb, var(--presentation-aqua) 10%, transparent);
  font-size: 1.15em;
  font-weight: 600;
}

.presentation__interaction {
  max-width: 760px;
  margin-top: 1.5rem;
  padding: 1.2rem;
  border: 1px solid color-mix(in srgb, var(--presentation-accent) 35%, var(--presentation-border));
  border-radius: 16px;
  background: color-mix(in srgb, var(--presentation-accent) 7%, var(--presentation-bg));
}

.presentation__interaction h3 { margin-top: 0; }

.presentation__options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.65rem;
}

.presentation__option {
  min-height: 48px;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--presentation-accent);
  border-radius: 12px;
  background: var(--presentation-bg);
  color: var(--presentation-ink);
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.presentation__option:hover,
.presentation__option:focus-visible,
.presentation__option.is-selected {
  outline: 3px solid color-mix(in srgb, var(--presentation-accent) 30%, transparent);
  background: var(--presentation-accent);
  color: #fff;
}

.presentation__privacy-note {
  margin-bottom: 0;
  color: #31536f;
  font-size: 0.85rem;
}

.presentation__reveal { margin-top: 1rem; }

.presentation__media img,
.presentation__media video { max-width: 100%; height: auto; border-radius: 14px; }
.presentation__media audio { width: 100%; }

.presentation__notes {
  align-self: start;
  padding: 1rem 1.2rem;
  border: 1px dashed var(--presentation-accent);
  border-radius: 14px;
  background: color-mix(in srgb, var(--presentation-accent) 8%, var(--presentation-bg));
}

.presentation__notes h3 { margin-top: 0; }

.presentation.has-visible-notes .presentation__scene { grid-template-columns: minmax(0, 2fr) minmax(240px, 1fr); }

.presentation__navigation {
  justify-content: space-between;
  gap: 1rem;
  min-height: 78px;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-top: 1px solid var(--presentation-border);
}

.presentation__navigation button:disabled { cursor: not-allowed; opacity: 0.45; }

@media (prefers-color-scheme: dark) {
  .presentation {
    --presentation-ink: #f8fafc;
    --presentation-border: #1e293b;
    --presentation-bg: #0b132b;
  }
  .presentation__eyebrow,
  .presentation__scene-number,
  .presentation__progress-copy,
  .presentation__analytics-note,
  .presentation__privacy-note { color: #a9c4d8; }
  .presentation-preview-notice { background: #102443; color: #f8fafc; }
}

@media (max-width: 760px) {
  .presentation-host-page { width: min(100% - 1rem, 1180px); margin: 0.5rem auto; }
  .presentation__shell { border-radius: 16px; }
  .presentation__header { align-items: flex-start; flex-direction: column; }
  .presentation__utility-actions { justify-content: flex-start; }
  .presentation__scene { padding: 1.5rem 1rem; }
  .presentation.has-visible-notes .presentation__scene { grid-template-columns: 1fr; }
  .presentation__navigation { align-items: stretch; flex-wrap: wrap; }
  .presentation__completion-actions { order: 3; width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: no-preference) {
  .presentation__scene.is-active { animation: presentation-scene-in 180ms ease-out; }
  @keyframes presentation-scene-in { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }
}

@media print {
  .presentation__utility-actions,
  .presentation__presenter-controls,
  .presentation__navigation { display: none; }
  .presentation__scene[hidden] { display: block; }
}