:root {
  --bg: #121317;
  --panel: #1b1d22;
  --panel-2: #23262d;
  --border: #30343c;
  --text: #e6e7eb;
  --muted: #8b909c;
  --accent: #22b8cf;
  --accent-ink: #06262b;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
}
h1 { font-size: 16px; margin: 0 8px 0 0; }
h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 8px; }
h2 small { text-transform: none; letter-spacing: 0; font-weight: normal; }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: 12px; }
.muted, .hint { color: var(--muted); font-size: 12px; }
.hint { margin-left: auto; }

input, select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 6px;
  font: inherit;
}
input[type=number] { width: 64px; }
input[type=range] { width: 90px; vertical-align: middle; padding: 0; }
input[type=color] { padding: 0; width: 28px; height: 24px; vertical-align: middle; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  font: inherit;
  user-select: none;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.icon { width: 34px; padding: 5px 0; }
.btn.tiny { padding: 1px 6px; font-size: 12px; }

.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 320px 1fr 280px;
}
.panel { padding: 14px; overflow: auto; min-height: 0; }
.left { border-right: 1px solid var(--border); display: flex; flex-direction: column; gap: 18px; }
.right { border-left: 1px solid var(--border); }
.center { display: flex; flex-direction: column; gap: 12px; }

.grid-settings { display: flex; flex-wrap: wrap; gap: 8px; }
.grid-settings label { display: flex; flex-direction: column; gap: 2px; font-size: 12px; color: var(--muted); }

.empty { color: var(--muted); font-size: 13px; }

/* Layers */
.layers { display: flex; flex-direction: column-reverse; gap: 10px; }
.layer {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
}
.layer.hidden-layer { opacity: .5; }
.layer-head { display: flex; align-items: center; gap: 6px; }
.layer-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.layer-sub { display: flex; align-items: center; gap: 8px; margin-top: 6px; font-size: 12px; color: var(--muted); }
.layer-sub input[type=range] { flex: 1; }
.swatches { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }
.swatch {
  width: 44px; height: 44px;
  border: 2px solid transparent;
  border-radius: 6px;
  background: #2c3038;
  image-rendering: pixelated;
  cursor: pointer;
  padding: 0;
}
.swatch.active { border-color: var(--accent); }
.swatch:hover { border-color: #5d6370; }
.swatch.active:hover { border-color: var(--accent); }

/* Stage */
.stage-wrap {
  flex: 1;
  min-height: 220px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: auto;
}
.checker {
  background-color: #2a2d34;
  background-image:
    linear-gradient(45deg, #34383f 25%, transparent 25%),
    linear-gradient(-45deg, #34383f 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #34383f 75%),
    linear-gradient(-45deg, transparent 75%, #34383f 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
canvas { image-rendering: pixelated; }

.controls, .row-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.controls label, .row-meta label { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
#frameInfo { min-width: 64px; text-align: center; }
#rowName { width: 180px; }

.strip { display: flex; flex-wrap: wrap; gap: 4px; }
.strip canvas {
  border: 2px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}
.strip canvas.active { border-color: var(--accent); }

/* Rows */
.rows { display: flex; flex-direction: column; gap: 4px; }
.row-item {
  display: flex; align-items: center; gap: 10px;
  padding: 4px 6px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
}
.row-item:hover { background: var(--panel-2); }
.row-item.active { background: var(--panel-2); border-color: var(--accent); }
.row-item.empty-row { opacity: .4; }
.row-item canvas { flex: none; border-radius: 4px; }
.row-label { flex: 1; min-width: 0; }
.row-label .name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row-label .meta { font-size: 11px; color: var(--muted); }

.drop-overlay {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  background: rgba(10, 30, 35, .8);
  border: 3px dashed var(--accent);
  font-size: 22px; font-weight: 600;
  z-index: 10;
  pointer-events: none;
}
.drop-overlay[hidden] { display: none; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .left, .right { border: 0; border-top: 1px solid var(--border); }
  .center { order: -1; }
  .stage-wrap { min-height: 260px; }
  .hint { display: none; }
}