:root {
  --slide-bg: #f7f9fc;
  --slide-panel: #ffffff;
  --slide-ink: #111827;
  --slide-muted: #6b7280;
  --slide-accent: #6366f1;
  --slide-outline: #e5e7eb;
}

.slide-wrap.light {
  background: var(--slide-bg);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 12px 36px rgba(15, 23, 42, .14);
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
}

.slide-viewer {
  background: var(--slide-panel);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 14px 36px rgba(15, 23, 42, .12);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 380px;
}

.slide-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.slide-menu {
  margin-right: 4px;
}

.slide-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--slide-ink);
  flex: 1 1 auto;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slide-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slide-actions2 {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slide-toolbar .slide-actions2 {
  margin-left: 12px;
}

.slide-more {
  position: relative;
}

.slide-more-toggle {
  font-size: 1.35rem;
}

.slide-more-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  background: var(--slide-panel);
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 18px 44px rgba(15, 23, 42, .18);
  display: none;
  z-index: 120;
  min-width: 240px;
}

.slide-more-menu.is-open {
  display: block;
}

.slide-more-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  justify-items: center;
}

.slide-more-menu .slide-btn {
  width: 3rem;
  height: 3rem;
}

.slide-more-grid .shareqr-button:not(.slide-btn) {
  border: 0;
  background: var(--slide-panel);
  color: var(--slide-ink);
  border-radius: .65rem;
  width: 2.7rem;
  height: 2.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--slide-outline);
  transition: background .15s ease, color .15s ease, transform .08s ease;
}

.slide-more-grid .shareqr-button:not(.slide-btn):hover {
  background: #eef2ff;
  color: var(--slide-accent);
}

.slide-more-grid .shareqr-button:not(.slide-btn):focus {
  outline: 2px solid var(--slide-accent);
  outline-offset: 2px;
}

.slide-more-grid .shareqr-button:not(.slide-btn):active {
  transform: translateY(1px);
}

.slide-more-grid .shareqr-button:not(.slide-btn)[disabled] {
  opacity: .4;
  cursor: not-allowed;
  background: #f3f4f6;
  color: var(--slide-muted);
}

.slide-btn {
  border: 0;
  background: var(--slide-panel);
  color: var(--slide-ink);
  border-radius: .65rem;
  width: 2.7rem;
  height: 2.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--slide-outline);
  transition: background .15s ease, color .15s ease, transform .08s ease;
}

.slide-btn:hover {
  background: #eef2ff;
  color: var(--slide-accent);
}

.slide-btn:focus {
  outline: 2px solid var(--slide-accent);
  outline-offset: 2px;
}

.slide-btn:active {
  transform: translateY(1px);
}

.slide-btn[disabled] {
  opacity: .4;
  cursor: not-allowed;
  background: #f3f4f6;
  color: var(--slide-muted);
  box-shadow: inset 0 0 0 1px #d1d5db;
}

.slide-btn.slide-audio.active {
  background: #eef2ff;
  color: var(--slide-accent);
  box-shadow: inset 0 0 0 1px var(--slide-accent);
}

.slide-btn.slide-marker-toggle.active {
  background: #fef3c7;
  color: #b45309;
  box-shadow: inset 0 0 0 1px #f59e0b;
}

.slide-link {
  text-decoration: none;
  color: inherit;
}

.slide-stage-outer {
  position: relative;
  width: 100%;
  height: clamp(360px, 72vh, 720px);
  background: radial-gradient(circle at center, #f3f4ff, #e0e7ff 45%, #c7d2fe 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .4);
}

.slide-stage-outer::after {
  content: '';
  position: absolute;
  inset: 18px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, .5);
  pointer-events: none;
}

.slide-stage {
  width: 960px;
  height: 540px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  touch-action: pan-y;
  transform: scale(var(--slide-stage-scale, 1));
  transform-origin: center;
}

.slide-stage.marker-mode {
  cursor: crosshair;
}

html.slide-immersive-active,
body.slide-immersive-active {
  margin: 0;
  background: radial-gradient(circle at top, #0f172a, #020617 70%);
  color-scheme: dark;
}

.slide-wrap.is-immersive {
  position: relative;
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-wrap.is-immersive .slide-viewer {
  position: relative;
  width: 100%;
  height: 100%;
  background: transparent;
  padding: 0;
  box-shadow: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-wrap.is-immersive .slide-stage-outer {
  width: min(100vw, 177.777vh);
  height: min(56.25vw, 100vh);
  border-radius: 0;
  background: radial-gradient(circle at center, #f3f4ff, #e0e7ff 45%, #c7d2fe 100%);
  box-shadow: none;
}

.slide-wrap.is-immersive .slide-stage-outer::after {
  display: none;
}

.slide-wrap.is-immersive .slide-stage {
  max-width: min(100vw, 177.777vh);
  max-height: min(56.25vw, 100vh);
}

.slide-wrap.is-immersive .slide-toolbar {
  position: absolute;
  top: 32px;
  left: 32px;
  transform: none;
  background: rgba(15, 23, 42, 0.35);
  padding: 10px 18px;
  border-radius: 999px;
  backdrop-filter: blur(14px);
  box-shadow: 0 18px 40px rgba(2, 6, 23, 0.3);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 80;
  pointer-events: auto;
}

@media (max-width: 768px) {
  .slide-wrap.is-immersive .slide-toolbar {
    left: 50%;
    transform: translateX(-50%);
  }
}

.slide-wrap.is-immersive .slide-more-menu {
  background: rgba(15, 23, 42, 0.78);
  box-shadow: 0 26px 64px rgba(2, 6, 23, 0.5);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.slide-wrap.is-immersive .slide-actions,
.slide-wrap.is-immersive .slide-actions2 {
  gap: 12px;
}

.slide-wrap.is-immersive .slide-btn {
  background: rgba(255, 255, 255, 0.06);
  color: #f8fafc;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.35);
  transition: background 0.18s ease, transform 0.08s ease, color 0.18s ease;
}

.slide-wrap.is-immersive .slide-btn:hover,
.slide-wrap.is-immersive .slide-btn.slide-audio.active {
  background: rgba(99, 102, 241, 0.18);
  color: #e0e7ff;
}

.slide-wrap.is-immersive .slide-btn[disabled] {
  opacity: 0.5;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.18);
  background: rgba(30, 41, 59, 0.4);
  color: rgba(148, 163, 184, 0.8);
}

.slide-wrap.is-immersive .slide-title,
.slide-wrap.is-immersive .slide-meta {
  display: none !important;
}

.slide-wrap.is-immersive .slide-panel {
  z-index: 140;
}

.slide-page {
  position: absolute;
  inset: 0;
  padding: 32px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--slide-ink);
  gap: 1.2rem;
  opacity: 0;
  transform: translateX(60px) scale(.98);
  pointer-events: none;
}

.slide-page.active {
  opacity: 1;
  transform: translateX(0) scale(1);
  pointer-events: auto;
  position: relative;
}

.slide-marker-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.slide-marker-layer canvas {
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

.slide-page.enter-forward {
  animation: slide-enter-forward .32s ease forwards;
}

.slide-page.enter-backward {
  animation: slide-enter-backward .32s ease forwards;
}

.slide-page.leave-forward {
  animation: slide-leave-forward .32s ease forwards;
  pointer-events: none;
}

.slide-page.leave-backward {
  animation: slide-leave-backward .32s ease forwards;
  pointer-events: none;
}

@keyframes slide-enter-forward {
  from { opacity: 0; transform: translateX(60px) scale(.96); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes slide-enter-backward {
  from { opacity: 0; transform: translateX(-60px) scale(.96); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes slide-leave-forward {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(-60px) scale(.96); }
}

@keyframes slide-leave-backward {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(60px) scale(.96); }
}

.slide-heading {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin: 0;
}

.slide-subheading {
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 600;
  margin: 0;
}

.slide-text {
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  line-height: 1.5;
  margin: 0;
  color: var(--slide-ink);
  max-width: 52ch;
}

.slide-stage .slide-loading,
.slide-stage .slide-empty {
  position: relative;
  z-index: 2;
  font-size: 1.1rem;
  color: var(--slide-muted);
}

.slide-meta {
  display: flex;
  justify-content: center;
  color: var(--slide-muted);
  font-size: .95rem;
}

.slide-panel {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .45);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
  z-index: 110;
}

.slide-panel.visible {
  opacity: 1;
  pointer-events: auto;
}

.slide-panel-inner {
  width: min(420px, 88vw);
  max-height: 80vh;
  background: var(--slide-panel);
  border-radius: 18px;
  box-shadow: 0 20px 48px rgba(15, 23, 42, .24);
  display: flex;
  flex-direction: column;
  margin: auto;
  overflow: hidden;
}

.slide-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: #eef2ff;
}

.slide-panel-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--slide-ink);
}

.slide-panel-body {
  padding: 18px 20px;
  overflow-y: auto;
  max-height: calc(80vh - 120px);
}

.slide-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.slide-toc-btn {
  width: 100%;
  border: 0;
  background: var(--slide-panel);
  box-shadow: inset 0 0 0 1px var(--slide-outline);
  border-radius: .75rem;
  padding: .65rem .8rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .65rem;
  align-items: center;
  text-align: left;
  font-size: .95rem;
  color: var(--slide-ink);
  cursor: pointer;
  transition: background .15s ease, color .15s ease, box-shadow .15s ease;
}

.slide-toc-btn:hover {
  background: #eef2ff;
  color: var(--slide-accent);
}

.slide-toc-btn:focus {
  outline: 2px solid var(--slide-accent);
  outline-offset: 2px;
}

.slide-toc-btn.active {
  box-shadow: inset 0 0 0 2px var(--slide-accent);
  color: var(--slide-accent);
}

.slide-toc-number {
  font-weight: 700;
  font-size: 1rem;
}

.slide-toc-label {
  line-height: 1.4;
}

@media (max-width: 768px) {
  .slide-wrap.light {
    padding: 16px;
  }

  .slide-stage {
    padding: 24px 18px;
  }

  .slide-page {
    padding: 24px 24px;
  }

  .slide-title {
    font-size: 1.05rem;
  }

  .slide-btn {
    width: 2.4rem;
    height: 2.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .slide-page,
  .slide-page.active {
    animation: none !important;
    transition: none !important;
    transform: translateX(0) scale(1) !important;
    opacity: 1 !important;
  }
}

.slide-browser.empty {
  background: #f8fafc;
  border-radius: 18px;
  padding: 36px;
  text-align: center;
  color: var(--slide-muted);
  font-size: 1rem;
}