:root {
  --bg: #111418;
  --panel: #1b1f24;
  --panel-2: #242a32;
  --text: #e6e8eb;
  --muted: #9aa3ad;
  --accent: #00bfff;
  --border: #2e343c;
  --danger: #e25555;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  min-height: 100vh;
}

.app-header {
  padding: 12px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.app-header h1 {
  font-size: 18px;
  margin: 0;
  letter-spacing: 0.02em;
}

main {
  padding: 16px;
}

.view {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

@media (max-width: 860px) {
  .view {
    grid-template-columns: 1fr;
  }
}

.canvases {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.canvas-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  display: flex;
  justify-content: center;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  max-width: 600px;
  aspect-ratio: 1 / 1;
  touch-action: none;
  image-rendering: pixelated;
  background: #000;
  border-radius: 4px;
}

#preview-canvas {
  max-width: 800px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

fieldset {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

legend {
  padding: 0 6px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  margin: 6px 0;
}

label input[type="color"] {
  width: 42px;
  height: 28px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  padding: 0;
  border-radius: 4px;
  cursor: pointer;
}

input[type="text"],
textarea {
  flex: 1;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

textarea {
  width: 100%;
  resize: vertical;
  word-break: break-all;
}

input[type="range"] {
  flex: 1;
}

.btn-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 8px;
}

button,
.file-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

button:hover,
.file-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

button.danger {
  color: var(--danger);
}

button.danger:hover {
  border-color: var(--danger);
}

.palette-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin: 6px 0 8px;
}

.swatch-wrap {
  position: relative;
  width: 26px;
  height: 26px;
}

.swatch {
  width: 26px;
  height: 26px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  background-clip: padding-box;
}

.swatch:hover {
  border-color: var(--accent);
}

.swatch[aria-pressed="true"] {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.swatch-remove {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 16px;
  height: 16px;
  padding: 0;
  line-height: 12px;
  font-size: 12px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.swatch-wrap:hover .swatch-remove,
.swatch-remove:focus {
  display: inline-flex;
}

.swatch-remove:hover {
  color: var(--danger);
  border-color: var(--danger);
}

.swatch-add {
  width: 26px;
  height: 26px;
  padding: 0;
  border: 1px dashed var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

.swatch-add:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.hint {
  color: var(--muted);
  font-size: 12px;
  margin: 6px 0 0 0;
}

.gallery-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.gallery-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.gallery-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.gallery-item canvas {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 4px;
}

.gallery-item .name {
  font-size: 14px;
  font-weight: 600;
  word-break: break-all;
}

.gallery-item .meta {
  font-size: 11px;
  color: var(--muted);
}

.gallery-item .actions {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.gallery-item .actions button {
  padding: 4px 8px;
  font-size: 12px;
  flex: 1;
}

.empty-msg {
  color: var(--muted);
  text-align: center;
  padding: 24px;
}

.empty-msg[hidden] {
  display: none;
}

.app-footer {
  padding: 12px 16px;
  color: var(--muted);
  text-align: center;
  font-size: 12px;
  border-top: 1px solid var(--border);
  margin-top: 24px;
}

.app-footer a {
  color: var(--muted);
}