:root {
  --bg: #15171c;
  --panel: #1f232b;
  --panel-2: #282d37;
  --text: #e6e8ee;
  --muted: #9aa1ae;
  --accent: #f0b429;
  --accent-text: #1b1405;
  --border: #353b47;
  --danger: #e5534b;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #eef0f4;
    --panel: #ffffff;
    --panel-2: #f2f4f8;
    --text: #1d2129;
    --muted: #5d6573;
    --accent: #c98a00;
    --accent-text: #ffffff;
    --border: #d4d8e0;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

header h1 { font-size: 18px; margin: 0; }
header .saved { color: var(--muted); font-size: 12px; flex: 1; }

main {
  display: grid;
  grid-template-columns: 240px minmax(320px, 1fr) minmax(320px, 1.1fr);
  gap: 12px;
  padding: 12px;
  align-items: start;
}

@media (max-width: 1100px) {
  main { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  min-width: 0;
}

h2 { font-size: 14px; margin: 4px 0 10px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
h2 + h2, .panel h2:not(:first-child) { margin-top: 18px; }
h3 { font-size: 13px; color: var(--muted); margin: 14px 0 6px; }

label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 12px; }
label input[type=text], label select { display: block; width: 100%; margin-top: 3px; }
label.inline { display: inline-flex; align-items: center; gap: 6px; margin: 0; }

input, select, button {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 5px 8px;
}

input[type=color] { padding: 0; width: 34px; height: 28px; }
input[type=range] { padding: 0; width: 90px; }

button { cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); width: 100%; margin-top: 6px; font-weight: 600; }
button.ghost { background: transparent; }
button.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

.row { display: flex; gap: 6px; margin-bottom: 6px; }
.row > button { flex: 1; }
.row.wrap { flex-wrap: wrap; }

#frames { list-style: none; padding: 0; margin: 0 0 8px; }
#frames li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 5px;
  cursor: pointer;
}
#frames li:hover { background: var(--panel-2); }
#frames li.active { background: var(--panel-2); outline: 1px solid var(--accent); }
#frames canvas { image-rendering: pixelated; width: 32px; height: 48px; border-radius: 3px; background: #3a3a44; }
#frames .badge { margin-left: auto; font-size: 11px; color: var(--muted); }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-bottom: 8px; }
.toolbar .sep { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }
.toolbar button[data-tool] { width: 34px; padding: 4px 0; }

.sheetWrap { display: flex; justify-content: center; overflow: auto; max-height: 70vh; }
canvas { image-rendering: pixelated; display: block; }
#sheet { cursor: crosshair; touch-action: none; }
.status { color: var(--muted); font-size: 12px; margin-top: 6px; min-height: 18px; }

.paletteRow { color: var(--muted); font-size: 12px; margin-top: 4px; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.swatch {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  background-image: conic-gradient(#888 25%, #bbb 0 50%, #888 0 75%, #bbb 0);
  background-size: 8px 8px;
  position: relative;
}
.swatch::after { content: ""; position: absolute; inset: 0; background: var(--c); border-radius: 2px; }
.swatch.big { width: 28px; height: 28px; cursor: default; }

.previewWrap { overflow: auto; max-width: 100%; }
#preview { cursor: pointer; touch-action: none; }
.hint { color: var(--muted); font-size: 12px; margin: 6px 0 0; }
#tiles { max-width: 100%; }

#toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 6px;
  opacity: 0;
  transition: opacity .2s;
  pointer-events: none;
  max-width: calc(100vw - 32px);
}
#toast.show { opacity: 1; }
#toast.error { border-color: var(--danger); }

.gen { display: grid; gap: 8px; }
.gen label.inline { justify-content: flex-start; color: var(--text); font-size: 13px; }
.gen input[type=color] { margin-left: auto; }
.gen input[type=number] { width: 52px; }
#preview.painting { cursor: crosshair; }
#genPresets button.active { background: var(--panel-2); }

.tabs { display: flex; gap: 4px; margin-bottom: 10px; border-bottom: 1px solid var(--border); }
.tabs button { border: none; border-bottom: 2px solid transparent; border-radius: 0; background: transparent; padding: 6px 10px; }
.tabs button.active { border-bottom-color: var(--accent); color: var(--text); font-weight: 600; }
button.small { padding: 2px 8px; }
#demo { cursor: pointer; }
#seamList { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; margin-top: 10px; }
.seam { background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 6px; cursor: pointer; font-size: 11px; color: var(--muted); text-align: center; }
.seam.active { outline: 2px solid #e040fb; }
.seam canvas { margin: 0 auto 4px; }
[hidden] { display: none !important; }
#demo, #preview { max-width: 100%; height: auto; }

footer { padding: 4px 16px 20px; color: var(--muted); font-size: 12px; }
footer a { color: var(--accent); }