:root {
  --bg: #0b0b0f;
  --panel: rgba(22, 22, 28, 0.72);
  --panel-border: rgba(255, 255, 255, 0.10);
  --fg: #e7e7ea;
  --muted: #9a9aa5;
  --accent: #6d8bff;
  --control-h: 56px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

body {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
}

/* ---- Stage ---- */
.stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  place-items: center;
  padding: clamp(8px, 2vw, 28px);
  touch-action: pan-y;
  user-select: none;
}

#canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
  background: #fff;
  opacity: 0;
  transition: opacity 0.18s ease;
}
#canvas.ready { opacity: 1; }

/* ---- Tap/click zones ---- */
.zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 28%;
  max-width: 240px;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}
.zone-prev { left: 0; cursor: w-resize; }
.zone-next { right: 0; cursor: e-resize; }
.zone:disabled { cursor: default; }

/* ---- Loader & error ---- */
.loader, .error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--muted);
  background: var(--bg);
  text-align: center;
  padding: 24px;
}
.loader[hidden], .error[hidden] { display: none; }
.spinner {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2s; }
  #canvas { transition: none; }
}

/* ---- Controls ---- */
.controls {
  flex: 0 0 auto;
  height: var(--control-h);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 0 16px calc(env(safe-area-inset-bottom, 0px));
  background: var(--panel);
  border-top: 1px solid var(--panel-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  color: var(--fg);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
  transition: background 0.15s ease, transform 0.05s ease;
}
.btn:hover { background: rgba(255, 255, 255, 0.12); }
.btn:active { transform: scale(0.95); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:disabled { opacity: 0.35; cursor: default; }
.btn.icon { width: 40px; height: 40px; padding: 8px; }
.btn.icon svg { width: 100%; height: 100%; }

.counter {
  min-width: 76px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.02em;
}

/* Auto-hide controls in fullscreen until pointer moves */
body.immersive .controls { opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }
body.immersive.show-ui .controls { opacity: 1; pointer-events: auto; }

/* ---- Offline pill & update toast ---- */
.offline-pill {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top, 0px));
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 20;
}
.offline-pill[hidden] { display: none; }
.offline-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #e0a23c;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--control-h) + 16px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 10px 16px;
  font-size: 14px;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 20;
}
.toast[hidden] { display: none; }
.toast-btn { padding: 6px 14px; font-size: 13px; }