:root {
  --editor-bg: #0b101b;
  --editor-grid: rgba(255, 255, 255, 0.028);
  --accent: #ff6337;
  --accent-soft: rgba(255, 99, 55, 0.2);
  --canvas-width: 1600px;
  --canvas-height: 900px;
  --canvas-scale: 1;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; }
body {
  margin: 0;
  color: #f7f8fb;
  background-color: var(--editor-bg);
  background-image:
    linear-gradient(var(--editor-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--editor-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  user-select: none;
}

button { font: inherit; }

#viewport { position: fixed; inset: 0; overflow: hidden; }
#canvas {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--canvas-width);
  height: var(--canvas-height);
  overflow: visible;
  background: #fff;
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.48), 0 0 0 1px rgba(255,255,255,.12);
  transform: translate(-50%, -50%) scale(var(--canvas-scale));
  transform-origin: center;
}

.slide-mount {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.slide-mount[hidden] { display: none; }
.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.ppt-component {
  position: absolute;
  box-sizing: border-box;
  min-width: 24px;
  min-height: 24px;
}
.ppt-component:not(:has([contenteditable="true"]:focus)) { cursor: default; }
[contenteditable="true"] {
  min-width: 1ch;
  outline: none;
  cursor: text;
  user-select: text;
  caret-color: var(--accent);
}
[contenteditable="true"]:focus {
  border-radius: 2px;
  box-shadow: 0 0 0 2px var(--accent-soft);
}

#selectionOverlay {
  position: absolute;
  z-index: 2147483640;
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 1px rgba(255,255,255,.85) inset;
  pointer-events: none;
}
#selectionOverlay[hidden] { display: none; }
#selectionOverlay i,
#selectionOverlay .move-handle {
  position: absolute;
  display: block;
  margin: 0;
  padding: 0;
  border: 2px solid #fff;
  background: var(--accent);
  box-shadow: 0 1px 4px rgba(0,0,0,.45);
  pointer-events: auto;
  touch-action: none;
}
#selectionOverlay i { width: 13px; height: 13px; }
#selectionOverlay [data-handle="nw"] { left: -8px; top: -8px; cursor: nwse-resize; }
#selectionOverlay [data-handle="n"] { left: 50%; top: -8px; transform: translateX(-50%); cursor: ns-resize; }
#selectionOverlay [data-handle="ne"] { right: -8px; top: -8px; cursor: nesw-resize; }
#selectionOverlay [data-handle="e"] { right: -8px; top: 50%; transform: translateY(-50%); cursor: ew-resize; }
#selectionOverlay [data-handle="se"] { right: -8px; bottom: -8px; cursor: nwse-resize; }
#selectionOverlay [data-handle="s"] { left: 50%; bottom: -8px; transform: translateX(-50%); cursor: ns-resize; }
#selectionOverlay [data-handle="sw"] { left: -8px; bottom: -8px; cursor: nesw-resize; }
#selectionOverlay [data-handle="w"] { left: -8px; top: 50%; transform: translateY(-50%); cursor: ew-resize; }
#selectionOverlay .move-handle {
  left: 50%;
  top: -35px;
  width: 48px;
  height: 20px;
  border-radius: 10px;
  transform: translateX(-50%);
  cursor: move;
}
#selectionOverlay .move-handle::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 4px;
  border-top: 2px dotted #fff;
  border-bottom: 2px dotted #fff;
  transform: translate(-50%, -50%);
}

#slideControls {
  position: fixed;
  z-index: 50;
  left: 50%;
  bottom: 11px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 14px;
  background: rgba(11,16,27,.9);
  box-shadow: 0 10px 32px rgba(0,0,0,.36);
  backdrop-filter: blur(14px);
  transform: translateX(-50%);
}
.slide-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 104px;
  height: 36px;
  padding: 0 14px;
  color: rgba(255,255,255,.9);
  background: rgba(255,255,255,.075);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 9px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: color .15s, background .15s, border-color .15s, transform .15s;
}
.slide-button:hover:not(:disabled) {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.slide-button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.slide-button:disabled { opacity: .32; cursor: not-allowed; }

#saveStatus,
#shortcutHint {
  position: fixed;
  z-index: 40;
  bottom: 12px;
  color: rgba(255,255,255,.58);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: .06em;
  pointer-events: none;
}
#pageCounter {
  min-width: 58px;
  color: rgba(255,255,255,.72);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .08em;
  text-align: center;
}
#saveStatus { right: 18px; text-align: right; }
#saveStatus[data-state="saved"] { color: #9bcf9c; }
#saveStatus[data-state="dirty"] { color: #ffd272; }
#saveStatus[data-state="error"] { color: #ff8768; }
#shortcutHint {
  left: 50%;
  bottom: 68px;
  padding: 5px 9px;
  color: rgba(255,255,255,.42);
  background: rgba(11,16,27,.72);
  transform: translateX(-50%);
  transition: opacity .5s;
}
#shortcutHint.is-hidden { opacity: 0; }

@media (max-width: 700px) {
  #slideControls { bottom: 8px; }
  .slide-button { min-width: 72px; padding: 0 10px; }
  #shortcutHint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}