* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #fafafa;
  color: #222;
}
.topbar {
  background: #1a1a1a;
  color: #fff;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.topbar .brand { color: #fff; text-decoration: none; font-weight: bold; }
main { max-width: 1680px; margin: 0 auto; padding: 16px; }
.hidden { display: none; }

/* gallery */
.gallery h1 { margin-bottom: 12px; }
.gallery #btn-new {
  padding: 6px 12px; background: #2563eb; color: #fff; border: none; cursor: pointer; margin-bottom: 12px;
}
#canvas-list { list-style: none; }
#canvas-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 8px; border-bottom: 1px solid #eee;
}
#canvas-list .name { flex: 1; color: #1a1a1a; }
#canvas-list button { padding: 4px 8px; cursor: pointer; }

/* editor */
.editor-toolbar {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  margin-bottom: 12px;
  padding: 8px; background: #fff; border: 1px solid #e5e7eb; border-radius: 4px;
}
.editor-toolbar input#canvas-name {
  padding: 4px 8px; font-size: 13px; width: 200px;
  border: 1px solid #d1d5db; border-radius: 3px;
}
.editor-toolbar button {
  padding: 4px 12px; font-size: 13px;
  background: #f3f4f6; border: 1px solid #d1d5db; border-radius: 3px; cursor: pointer;
}
.editor-toolbar button:hover { background: #e5e7eb; }

.editor-main {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 16px;
  align-items: start;
}
.editor-canvas-area {
  display: flex; flex-direction: column; gap: 8px;
  align-items: center;
}
.editor canvas#board {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background-color: #fff;
  background-image:
    linear-gradient(to right, rgba(0,0,0,0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,0,0,0.12) 1px, transparent 1px);
  background-size: calc(100% / var(--cell-count, 32)) calc(100% / var(--cell-count, 32));
  border: 1px solid #ccc;
  aspect-ratio: 1 / 1;
  height: min(calc(100vh - 180px), calc(100vw - 320px));
  width: auto;
  max-height: calc(100vh - 180px);
  max-width: 100%;
  cursor: crosshair;
  touch-action: none;
  display: block;
}
.editor-infobar {
  display: flex; gap: 16px; align-items: center; flex-wrap: wrap;
  padding: 6px 10px; background: #fff; border: 1px solid #e5e7eb; border-radius: 4px;
  font-size: 13px; color: #4b5563;
  min-height: 32px;
}
#coord-display { font-family: "SF Mono", Consolas, monospace; color: #1f2937; }
#status-text { color: #059669; }
#share-url-display { color: #2563eb; word-break: break-all; }

.editor-sidebar {
  display: flex; flex-direction: column; gap: 16px;
  padding: 12px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  position: sticky; top: 16px;
}
.sidebar-section { display: flex; flex-direction: column; gap: 8px; }
.sidebar-label {
  font-size: 12px; color: #6b7280; font-weight: 500; letter-spacing: 0.5px;
  text-transform: uppercase;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(8, 20px);
  gap: 3px;
}
.color-item {
  width: 20px; height: 20px;
  border: 1px solid rgba(0,0,0,0.15);
  cursor: pointer;
  border-radius: 2px;
  transition: transform 0.08s;
}
.color-item:hover { transform: scale(1.15); border-color: rgba(0,0,0,0.4); }
.color-item.active {
  box-shadow: 0 0 0 2px #1a1a1a;
  transform: scale(1.1);
  border-color: transparent;
}

.brush-row { display: flex; gap: 6px; }
.brush-item {
  width: 32px; height: 32px;
  background: #f3f4f6; border: 1px solid #d1d5db; border-radius: 3px;
  cursor: pointer; font-size: 13px; font-weight: 500;
}
.brush-item:hover { background: #e5e7eb; }
.brush-item.active {
  background: #1a1a1a; color: #fff; border-color: #1a1a1a;
}

.sidebar-hint {
  font-size: 12px; color: #6b7280; line-height: 1.6;
  padding-top: 8px; border-top: 1px solid #e5e7eb;
}

/* viewer */
.viewer canvas#board {
  image-rendering: pixelated;
  width: min(720px, 100%);
  height: auto;
  background: #fff;
  border: 1px solid #ccc;
}