:root {
  --bg: #0d0d1a;
  --panel: #13132a;
  --toolbar: #1a1a2e;
  --border: #2a2a4a;
  --text: #c0c0d0;
  --text-dim: #6070a0;
  --accent: #7c6af0;
  --accent-glow: rgba(124,106,240,0.25);
  --btn: #222240;
  --btn-hover: #2e2e52;
  --active: rgba(124,106,240,0.2);
  --danger: #7a1515;
  --danger-hover: #9a2020;
}

html { height: 100%; height: 100svh; }

*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 12px;
  height: 100%;
  height: 100svh;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
  height: 100svh;
  min-height: 0;
}

/* ── Toolbar ── */
#toolbar {
  min-height: 36px;
  background: var(--toolbar);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 3px;
  row-gap: 3px;
  padding: 3px 8px;
  flex-shrink: 0;
}

/* ── Main layout ── */
#main { flex: 1 1 0; min-height: 0; display: flex; overflow: hidden; }

/* ── Left panel ── */
#left-panel {
  width: 56px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px;
  gap: 3px;
  flex-shrink: 0;
  overflow-y: auto;
}
#left-panel::-webkit-scrollbar { width: 0; }

/* ── Canvas ── */
#canvas-container {
  flex: 1 1 0;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: #06060f;
  position: relative;
}
#main-canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: top left;
  box-shadow: 0 0 40px rgba(124,106,240,0.15), 0 0 0 1px var(--border);
  z-index: 1;
}
#overlay-canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  cursor: crosshair;
}

/* ── Right panel ── */
#right-panel {
  width: 220px;
  min-height: 0;
  background: var(--panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}
#right-panel::-webkit-scrollbar { width: 4px; }
#right-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── Status bar ── */
#gradient-panel {
  display: none;
  flex-direction: row;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  height: 30px;
}
#gradient-panel.visible { display: flex; }

#gradient-panel select#grad-preset {
  font-size: 11px;
  padding: 2px 4px;
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  height: 24px;
  flex-shrink: 0;
}

.grad-label {
  font-size: 11px;
  opacity: .6;
  white-space: nowrap;
  flex-shrink: 0;
}
.grad-slider { width: 72px; flex-shrink: 0; }
.grad-val { font-size: 11px; min-width: 34px; text-align: right; flex-shrink: 0; opacity: .9; }

#btn-gradient-mode {
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 11px;
  padding: 2px 7px;
  line-height: 1.4;
  white-space: nowrap;
}
#btn-gradient-mode:hover { background: var(--btn-hover); }
#btn-gradient-mode.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── Shape panel ── */
#shape-panel {
  display: none;
  flex-direction: row;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  height: 38px;
  overflow-x: auto;
}
#shape-panel.visible { display: flex; }
#shape-panel #shapep-star-row,
#shape-panel #shapep-poly-row { display: none; flex-direction: row; align-items: center; gap: 5px; }
#shape-panel #shapep-star-row.showing,
#shape-panel #shapep-poly-row.showing { display: flex; }
.shape-num { width: 40px; font-size: 11px; padding: 1px 3px; background: var(--btn); color: var(--text); border: 1px solid var(--border); border-radius: 3px; }
.shape-sel { font-size: 11px; padding: 2px 4px; background: var(--btn); color: var(--text); border: 1px solid var(--border); border-radius: 3px; cursor: pointer; }
.snap-btn { font-size: 10px; padding: 2px 6px; white-space: nowrap; }
.snap-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
#btn-stamp-mode.active { background: var(--accent); color: #fff; border-color: var(--accent); }

#status-bar {
  height: 38px;
  min-height: 38px;
  background: var(--toolbar);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 6px;
  padding: 0 8px;
}

/* ── Buttons ── */
.btn {
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  font-size: 11px;
  white-space: nowrap;
  transition: background 0.1s, border-color 0.1s;
}
.btn:hover { background: var(--btn-hover); }
.btn:active { background: var(--accent); border-color: var(--accent); }

.btn-small {
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 6px;
  cursor: pointer;
  font-size: 10px;
}
.btn-small:hover { background: var(--btn-hover); }

.icon-btn { padding: 3px 6px; font-weight: bold; }

.btn-danger { background: var(--danger); border-color: var(--danger); width: 100%; margin-top: 6px; }
.btn-danger:hover { background: var(--danger-hover); }

/* ── Tool buttons ── */
.tool-btn {
  width: 44px;
  height: 38px;
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.1s;
  flex-shrink: 0;
  font-family: monospace;
  font-weight: bold;
}
.tool-btn:hover { background: var(--btn-hover); border-color: var(--accent); }
.tool-btn.active { background: var(--active); border-color: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }

/* CSS tooltip for left-panel tool buttons */
.tool-btn[title] { position: relative; }
.tool-btn[title]::after {
  content: attr(title);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: #1e1e3a;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 5px 9px;
  border-radius: 5px;
  font-size: 11px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: normal;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s 0.4s;
  z-index: 200;
  max-width: 260px;
  white-space: normal;
  line-height: 1.4;
  text-align: left;
}
.tool-btn[title]:hover::after { opacity: 1; }

/* Clear button */
.btn-clear { border-color: #5a2a2a; color: #e08080; }
.btn-clear:hover { background: #3a1515; border-color: #8a3a3a; color: #ffaaaa; }

/* ── Helpers ── */
.toolbar-group { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.toolbar-sep { width: 1px; height: 22px; background: var(--border); margin: 0 2px; flex-shrink: 0; }
.panel-sep { height: 1px; background: var(--border); margin: 4px 0; }
.panel-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-dim);
  padding: 6px 8px 2px;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

/* ── Checkbox labels ── */
.checkbox-label { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.checkbox-label input { cursor: pointer; accent-color: var(--accent); }

/* ── Inputs ── */
input[type="range"] {
  accent-color: var(--accent);
  cursor: pointer;
  height: 4px;
}
input[type="color"] {
  width: 26px;
  height: 22px;
  padding: 1px;
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  background: none;
}
input[type="number"], select {
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 4px;
  font-size: 11px;
}
select { cursor: pointer; }

#axes-display { font-weight: bold; min-width: 24px; text-align: center; font-size: 14px; }
#color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: #ff6b9d;
}

/* ── Palette ── */
#palette-drop-zone {
  margin: 6px 8px;
  padding: 14px 8px;
  border: 2px dashed var(--border);
  border-radius: 6px;
  text-align: center;
  color: var(--text-dim);
  font-size: 11px;
  line-height: 1.5;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}
#palette-drop-zone:hover, #palette-drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--text);
}
#palette-list {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 4px 6px;
  flex-shrink: 0;
}
.palette-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: 5px;
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  transition: all 0.1s;
}
.palette-item:hover { background: var(--btn); }
.palette-item.selected { border-color: var(--accent); background: var(--active); }
.palette-thumb {
  width: 36px;
  height: 36px;
  object-fit: contain;
  background: repeating-conic-gradient(#fff1 0% 25%, #fff0 0% 50%) 0 0 / 8px 8px;
  border-radius: 3px;
  display: block;
  flex-shrink: 0;
  image-rendering: pixelated;
}
.palette-info { flex: 1; overflow: hidden; }
.palette-name {
  font-size: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}
.palette-badges { display: flex; gap: 3px; margin-top: 2px; flex-wrap: wrap; }
.badge {
  font-size: 8px;
  background: var(--accent);
  color: #fff;
  padding: 1px 4px;
  border-radius: 2px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.badge-gif { background: #c0801a; }
.badge-ss { background: #1a80c0; }
.badge-trans { background: #1a8040; }
.palette-del-btn {
  background: var(--danger);
  border: none;
  color: #fff;
  border-radius: 3px;
  width: 18px;
  height: 18px;
  cursor: pointer;
  font-size: 11px;
  line-height: 1;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.1s;
}
.palette-item:hover .palette-del-btn { opacity: 1; }

/* ── Properties panel ── */
#sprite-props, #palette-item-props {
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.prop-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 0;
}
.prop-label {
  font-size: 10px;
  color: var(--text-dim);
  width: 55px;
  flex-shrink: 0;
}
.prop-val {
  font-size: 10px;
  color: var(--text);
  min-width: 32px;
  text-align: right;
}
#sprite-props input[type="range"],
#shape-props input[type="range"] { flex: 1; min-width: 0; }

/* ── Mandala list ── */
#mandala-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
}
.mandala-item {
  width: 44px;
  height: 34px;
  border-radius: 5px;
  cursor: pointer;
  border: 2px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: bold;
  transition: all 0.1s;
  position: relative;
  flex-direction: column;
  gap: 1px;
}
.mandala-item:hover { border-color: var(--border); background: var(--btn); }
.mandala-item.active { border-color: var(--accent); background: var(--active); }
.mandala-item-label { font-size: 8px; opacity: .7; }

/* ── Sprite sheet grid ── */
#ss-grid-preview {
  margin: 6px 0;
  border: 1px solid var(--border);
  cursor: pointer;
  max-height: 120px;
  overflow: auto;
}
.ss-grid-inner { display: grid; gap: 1px; background: var(--border); }
.ss-cell {
  aspect-ratio: 1;
  min-height: 18px;
  cursor: pointer;
  position: relative;
  background-size: var(--ss-w) var(--ss-h);
  outline: 1px solid rgba(255,255,255,0.08);
}
.ss-cell::after {
  content: '';
  position: absolute;
  inset: 0;
  transition: background 0.1s;
}
.ss-cell:hover::after { background: rgba(255,255,255,0.15); }
.ss-cell.selected::after { background: rgba(124,106,240,0.45); outline: 2px solid var(--accent); outline-offset: -2px; }

/* ── Scrollbars ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--btn-hover); }

/* ── Generic modal overlay ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
}
.modal-dialog {
  background: var(--toolbar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  min-width: 260px;
  max-width: 90vw;
  display: flex; flex-direction: column; gap: 10px;
}
.modal-dialog h3 { font-size: 13px; color: var(--text); }

/* ── GIF export modal ── */
.gif-row { display:flex; align-items:center; gap:8px; }
.gif-label { font-size:12px; min-width:72px; opacity:0.8; }
.gif-num { font-size:12px; min-width:24px; text-align:right; }
.gif-unit { font-size:11px; opacity:0.6; white-space:nowrap; }
.gif-dur { opacity:0.6; font-size:11px; }
.gif-hint { font-size:11px; opacity:0.55; margin-left:80px; min-height:14px; margin-bottom:2px; }
#gif-fps { flex:1; }
#gif-modal .modal-dialog input[type=number] { background:var(--panel); border:1px solid var(--border); color:var(--text); border-radius:4px; padding:3px 6px; font-size:12px; }
#gif-modal .modal-dialog select { background:var(--panel); border:1px solid var(--border); color:var(--text); border-radius:4px; padding:3px 6px; font-size:12px; flex:1; }

/* ── Transparency overlay dialog ── */
#trans-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
}
#trans-dialog {
  background: var(--toolbar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  min-width: 260px;
  display: flex; flex-direction: column; gap: 10px;
}
#trans-dialog h3 { font-size: 13px; color: var(--text); }
#trans-canvas-preview {
  max-width: 220px;
  max-height: 180px;
  border: 1px solid var(--border);
  cursor: crosshair;
  display: block;
  background: repeating-conic-gradient(#444 0% 25%, #333 0% 50%) 0 0 / 10px 10px;
}

/* ── Crop badges ── */
.badge-crop { background: #804a1a; }
.badge-webp { background: #308060; }

/* ── Animation ── */
.anim-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1;
  padding: 1px 4px;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.1s;
}
.anim-btn:hover { border-color: var(--accent); color: var(--accent); }
.anim-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }

.anim-panel {
  margin: 0 8px 6px;
  padding: 6px;
  background: rgba(0,0,0,0.25);
  border-left: 2px solid var(--accent);
  border-radius: 0 4px 4px 0;
}
.anim-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 5px;
  flex-wrap: wrap;
}
.anim-label { font-size: 10px; color: var(--text-dim); white-space: nowrap; }
.anim-hint  { font-size: 9px; color: var(--text-dim); opacity: 0.6; line-height: 1.3; margin-top: 3px; }
.anim-controls input[type="number"] { width: 42px; font-size: 11px; }
.anim-preset-sel { font-size: 10px; background: var(--btn); color: var(--text); border: 1px solid var(--border); border-radius: 3px; padding: 1px 2px; flex: 1; min-width: 0; cursor: pointer; }
.anim-ease-sel   { font-size: 10px; background: var(--btn); color: var(--text); border: 1px solid var(--accent); border-radius: 3px; padding: 1px 4px; cursor: pointer; }
.anim-kf-row { display: flex; align-items: center; gap: 5px; margin-top: 4px; padding: 3px 4px; background: rgba(124,106,240,0.1); border-radius: 3px; }
.anim-kf-del { background: none; border: 1px solid #5a2a2a; border-radius: 3px; color: #e08080; cursor: pointer; padding: 2px 4px; flex-shrink: 0; transition: all 0.1s; }
.anim-kf-del:hover { background: #3a1515; border-color: #8a3a3a; color: #ffaaaa; }
canvas[id^="anim-tl-"] {
  display: block;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: crosshair;
}

/* ── Responsive ── */

/* Narrow: collapse right panel, slim left panel */
@media (max-width: 700px) {
  #right-panel {
    width: 160px;
  }
  .palette-name { display: none; }
  .palette-info { display: none; }
  .palette-thumb { width: 28px; height: 28px; }
  .palette-item { padding: 3px; }
}

@media (max-width: 520px) {
  #right-panel { display: none; }
  #left-panel { width: 40px; }
  #left-panel .panel-label { display: none; }
  .tool-btn { width: 36px; height: 32px; font-size: 14px; }
  .mandala-item { width: 36px; height: 28px; }
  #status-bar { gap: 4px; padding: 0 4px; font-size: 11px; }
}

/* Status bar wraps on narrow */
@media (max-width: 420px) {
  #status-bar { flex-wrap: wrap; height: auto; min-height: 34px; padding: 3px 4px; }
}

/* ── Help overlay ─────────────────────────────────── */
#help-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}
#help-overlay.visible { display: flex; }

#help-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 560px;
  max-width: 94vw;
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
}

#help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

#btn-help-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  opacity: .55;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}
#btn-help-close:hover { opacity: 1; background: var(--btn); }

#help-body {
  overflow-y: auto;
  padding: 14px 18px 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 28px;
}

.help-section { display: flex; flex-direction: column; gap: 5px; }
.help-section-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: .5;
  margin-bottom: 2px;
}
.help-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  line-height: 1.4;
}
.help-row span { opacity: .8; }
kbd {
  background: var(--btn);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: inherit;
  font-size: 11px;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 28px;
  text-align: center;
}