/*
  Living Tree — styles
  --------------------
  The page is a calm, gallery-like frame for the artwork. The canvases are
  absolutely stacked and centered; the panel floats quietly until summoned.
*/

:root {
  --bg: #f4f1ea;          /* warm paper tone behind the painting   */
  --ink: #3a3a36;         /* muted ink for UI text                 */
  --panel-bg: rgba(244, 241, 234, 0.86);
  --panel-line: rgba(58, 58, 54, 0.18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  overflow: hidden;          /* the artwork owns the whole viewport */
  cursor: crosshair;
}

/* The stage holds all four stacked canvas layers. */
#stage {
  position: fixed;
  inset: 0;
  display: block;
}

.layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  /* layers are positioned/scaled in JS via the device-pixel canvas size */
}

/* ---- Hidden controls -------------------------------------------------- */

#panel-toggle {
  position: fixed;
  left: 18px;
  bottom: 18px;
  width: 14px;
  height: 14px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(58, 58, 54, 0.28);
  cursor: pointer;
  z-index: 20;
  transition: background 0.4s ease, transform 0.4s ease;
}
#panel-toggle:hover { background: rgba(58, 58, 54, 0.6); transform: scale(1.25); }

#panel {
  position: fixed;
  left: 18px;
  bottom: 44px;
  width: 248px;
  padding: 18px 20px 14px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-line);
  border-radius: 10px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  z-index: 21;
  transition: opacity 0.45s ease, transform 0.45s ease;
}
#panel.hidden {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}

#panel h1 {
  margin: 0 0 2px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
#panel .hint { margin: 0 0 14px; font-size: 12.5px; opacity: 0.7; font-style: italic; }

#panel label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  opacity: 0.78;
  margin-bottom: 12px;
}

#panel input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  margin-top: 7px;
  border-radius: 3px;
  background: rgba(58, 58, 54, 0.25);
  outline: none;
}
#panel input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #6b7a4f;          /* sage-olive accent */
  cursor: pointer;
  border: 2px solid var(--bg);
}
#panel input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border: 2px solid var(--bg);
  border-radius: 50%; background: #6b7a4f; cursor: pointer;
}

#panel .row { display: flex; gap: 8px; margin-top: 4px; }
#panel button {
  flex: 1;
  font: inherit;
  font-size: 12px;
  padding: 8px 6px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--panel-line);
  border-radius: 7px;
  cursor: pointer;
  transition: background 0.25s ease;
}
#panel button:hover { background: rgba(107, 122, 79, 0.18); }
#panel button.active { background: rgba(107, 122, 79, 0.35); border-color: #6b7a4f; }

#panel .credit {
  margin: 14px 0 0;
  font-size: 11px;
  opacity: 0.55;
}
#panel kbd {
  font-family: ui-monospace, monospace;
  background: rgba(58, 58, 54, 0.12);
  padding: 1px 5px;
  border-radius: 4px;
}
#panel code, #missing code {
  font-family: ui-monospace, monospace;
  font-size: 0.92em;
}

/* ---- Missing image notice -------------------------------------------- */
#missing {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  z-index: 30;
  background: var(--bg);
}
#missing p { margin: 0; max-width: 420px; line-height: 1.5; }

.hidden { display: none !important; }
/* panel uses opacity-based hide, so override the generic .hidden for it */
#panel.hidden { display: block !important; }