:root {
  --bg: #0f1115;
  --bg-panel: #171a21;
  --bg-elevated: #1f2430;
  --border: #2a3040;
  --text: #e4e6ea;
  --text-muted: #8b92a3;
  --accent: #5b8cff;
  --accent-hover: #7aa0ff;
  --danger: #ff6b6b;
  --radius: 6px;
}

* { 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, Arial, sans-serif;
  font-size: 13px;
  height: 100vh;
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 16px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 14px;
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.5px;
}

.variant-picker {
  display: flex; align-items: center; gap: 6px;
  margin-left: 18px;
  padding-left: 18px;
  border-left: 1px solid var(--border);
}
.variant-picker label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.6px; }
.variant-picker select {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 6px;
  font-size: 12px;
  font-family: inherit;
  min-width: 120px;
}
.variant-picker button {
  padding: 4px 8px;
  font-size: 12px;
  min-width: 26px;
  line-height: 1;
}

.topbar-actions { display: flex; gap: 8px; align-items: center; }
.topbar-spacer { width: 12px; display: inline-block; border-left: 1px solid var(--border); height: 24px; }

button.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: transparent;
  border: 1px solid var(--border);
}
button.toggle .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-muted);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.25);
}
button.toggle.on { color: var(--text); }
button.toggle.on .dot { background: var(--accent); }

.panel-actions { margin-top: 8px; display: flex; gap: 6px; }
.panel-actions button { font-size: 11px; padding: 4px 8px; }
.panel-actions button:disabled { opacity: 0.4; cursor: not-allowed; }

button.icon {
  padding: 4px 8px;
  font-size: 15px;
  line-height: 1;
  min-width: 28px;
}
button.icon:disabled { opacity: 0.35; cursor: not-allowed; }

.preset-row { display: flex; gap: 6px; margin-top: 6px; align-items: center; }
.preset-row input[type="text"],
.preset-row select {
  flex: 1;
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 6px;
  font-size: 11px;
  font-family: inherit;
}
.preset-row input[type="text"]:disabled,
.preset-row select:disabled { opacity: 0.45; }
.preset-row button { font-size: 11px; padding: 4px 8px; }

button {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s;
  font-family: inherit;
}
button:hover { background: #2a3040; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button.linklike {
  background: none;
  border: none;
  color: var(--accent);
  padding: 0;
  text-decoration: underline;
  font-size: inherit;
}

.workspace {
  display: grid;
  grid-template-columns: 280px 1fr 300px;
  height: calc(100vh - 48px);
}

.sidebar {
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}
.sidebar-right { border-right: none; border-left: 1px solid var(--border); }

.panel { padding: 12px 16px; border-bottom: 1px solid var(--border); }
.panel h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin: 0 0 8px;
  font-weight: 600;
}
.panel-footer { margin-top: 8px; font-size: 11px; color: var(--text-muted); }

.dropzone {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 12px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
}
.dropzone.dragover { border-color: var(--accent); background: rgba(91,140,255,0.08); }
.dropzone p { margin: 0; }
#master-preview img { max-width: 100%; margin-top: 8px; border-radius: 4px; display: block; }
#master-preview .muted { margin-top: 4px; }

.layer-upload-list {
  list-style: none; padding: 0; margin: 8px 0 0;
  display: flex; flex-direction: column; gap: 6px;
}
.layer-upload-list li {
  display: grid;
  grid-template-columns: 24px 1fr auto auto 20px;
  gap: 6px;
  align-items: center;
  padding: 4px 6px;
  background: var(--bg-elevated);
  border-radius: 4px;
  font-size: 11px;
  position: relative;
}
.layer-upload-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 4px 0 0 4px;
  background: transparent;
}
.layer-upload-list li[data-group="A"]::before { background: #5b8cff; }
.layer-upload-list li[data-group="B"]::before { background: #ff6b6b; }
.layer-upload-list li[data-group="C"]::before { background: #27ae60; }
.layer-upload-list li[data-group="D"]::before { background: #ffb857; }
.layer-upload-list li[data-group="E"]::before { background: #c678dd; }
.layer-upload-list li[data-group="F"]::before { background: #29d6d6; }
.layer-upload-list img { width: 24px; height: 24px; object-fit: contain; background: #000; border-radius: 3px; box-shadow: inset 0 0 0 1px transparent; }
.layer-upload-list li.aligned img { box-shadow: 0 0 0 1px var(--accent); }
.layer-upload-list li.aligned span { color: var(--text); }
.layer-upload-list span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.layer-upload-list select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 11px;
  padding: 2px 4px;
  font-family: inherit;
}
.layer-upload-list .remove {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; font-size: 14px; padding: 0;
}
.layer-upload-list .remove:hover { color: var(--danger); }

.networks-list { display: flex; flex-direction: column; gap: 6px; }
.network-group { background: var(--bg-elevated); border-radius: 4px; overflow: hidden; }
.network-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 10px; cursor: pointer; font-weight: 600; font-size: 12px;
  user-select: none;
}
.network-head .caret { font-size: 10px; color: var(--text-muted); }
.network-sizes { display: none; flex-direction: column; padding: 4px 10px 10px; gap: 4px; }
.network-group.open .network-sizes { display: flex; }
.network-sizes label {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; cursor: pointer; color: var(--text);
}
.network-sizes label .muted { color: var(--text-muted); }

.canvas-area {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  overflow: hidden;
  min-width: 0;
}
.canvas-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 32px 16px 16px;
  position: relative;
  min-height: 0;
}
.canvas-main .empty-state {
  color: var(--text-muted);
  text-align: center;
  font-size: 13px;
}
.canvas-wrap {
  position: relative;
  box-shadow: 0 0 0 1px var(--border), 0 20px 60px rgba(0,0,0,0.5);
  background-image:
    linear-gradient(45deg, #2b2b2b 25%, transparent 25%),
    linear-gradient(-45deg, #2b2b2b 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2b2b2b 75%),
    linear-gradient(-45deg, transparent 75%, #2b2b2b 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-color: #222;
}
.canvas-label {
  position: absolute;
  top: -22px; left: 0;
  font-size: 11px; color: var(--text-muted);
  white-space: nowrap;
}

.canvas-previews {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 132px;
  align-items: flex-end;
}
.preview-tile {
  flex: 0 0 auto;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 72px;
  transition: border-color 0.1s;
}
.preview-tile:hover { border-color: #3a4256; }
.preview-tile.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.preview-tile canvas { background: #000; display: block; border-radius: 2px; }
.preview-tile .size-name { font-size: 10px; font-weight: 600; color: var(--text); max-width: 90px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preview-tile .size-label { font-size: 10px; color: var(--text-muted); }

.layers-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 4px;
}
.layers-list li {
  display: grid;
  grid-template-columns: 22px 1fr 20px 20px 22px 22px;
  gap: 4px;
  align-items: center;
  padding: 6px 8px;
  background: var(--bg-elevated);
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
}
.layers-list li.locked { background: #23252f; }
.layers-list li.locked .layer-name { font-style: italic; }
.layers-list li.selected { outline: 1px solid var(--accent); }
.layers-list .layer-name {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  display: flex; flex-direction: column; gap: 1px;
}
.layers-list .layer-role { color: var(--text-muted); font-size: 10px; }
.layers-list .icon-btn {
  background: none; border: none; color: var(--text-muted);
  padding: 2px 4px; cursor: pointer; font-size: 12px;
  display: flex; align-items: center; justify-content: center;
}
.layers-list .icon-btn:hover { color: var(--text); }
.layers-list li.hidden-layer .layer-name { opacity: 0.45; text-decoration: line-through; }
.layers-list li.auto-hidden .layer-role { color: #ffb857; }

.group-badge {
  display: inline-block;
  min-width: 14px;
  padding: 0 4px;
  font-size: 9px;
  font-weight: 700;
  text-align: center;
  border-radius: 3px;
  background: #444;
  color: #fff;
  margin-right: 4px;
  vertical-align: baseline;
  line-height: 14px;
}
.group-badge[data-group="A"] { background: #5b8cff; }
.group-badge[data-group="B"] { background: #ff6b6b; }
.group-badge[data-group="C"] { background: #27ae60; }
.group-badge[data-group="D"] { background: #ffb857; color: #222; }
.group-badge[data-group="E"] { background: #c678dd; }
.group-badge[data-group="F"] { background: #29d6d6; color: #222; }

.transform-panel .row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 6px;
  align-items: center;
  margin-bottom: 6px;
}
.transform-panel input[type="number"] {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 6px;
  font-size: 11px;
  width: 100%;
  font-family: inherit;
}
.transform-panel label { color: var(--text-muted); font-size: 11px; }
.transform-panel .actions { display: flex; gap: 6px; margin-top: 8px; }

.muted { color: var(--text-muted); font-size: 11px; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  font-size: 12px;
  z-index: 1000;
  transition: opacity 0.3s;
}
.toast.error { border-color: var(--danger); color: #ffb3b3; }

.modal {
  position: fixed; inset: 0; z-index: 900;
  display: flex; align-items: center; justify-content: center;
}
.modal[hidden] { display: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.55);
}
.modal-dialog {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  width: min(520px, 90vw);
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 30px 70px rgba(0,0,0,0.6);
}
.modal-dialog h3 {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
}
.modal-row {
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.modal-row label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.modal-row input[type="text"] {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.modal-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.modal-hint code {
  background: var(--bg-elevated);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 10px;
}
.modal-check {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; margin-bottom: 12px;
}
.export-canvas-list {
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  display: flex; flex-direction: column; gap: 4px;
}
.export-canvas-list label {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: 8px;
  font-size: 11px;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  align-items: center;
}
.export-canvas-list .filename {
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px;
  margin-left: 12px;
  display: block;
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 12px;
}