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

:root {
  --bg: #08080e;
  --bg-2: #10101a;
  --bg-3: #18182a;
  --border: #252535;
  --border-2: #353550;
  --text: #e0e0f0;
  --text-muted: #70708a;
  --accent: #00d4ff;
  --accent-dim: #005878;
  --accent-hover: #33ddff;
  --radius: 8px;
  --transition: 0.12s ease;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 13px;
  line-height: 1.5;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ── Header ──────────────────────────────────────────────────────────────── */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 48px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
}

.app-header h1 {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent) 0%, #aa44ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.project-name-input {
  height: 30px;
  min-width: 180px;
  max-width: 240px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 0 10px;
  font-size: 12px;
}

.project-name-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.16);
}

#export-filename {
  height: 30px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 0 10px;
  font-size: 12px;
}

#export-filename:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.16);
}

/* ── Body ────────────────────────────────────────────────────────────────── */

.app-body {
  display: grid;
  grid-template-columns: 200px 185px 1fr minmax(300px, 22vw);
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.app-body.app-body--layers-collapsed {
  grid-template-columns: 44px 185px 1fr minmax(300px, 22vw);
}

/* ── Content layers panel ───────────────────────────────────────────────── */

.layers-panel {
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  overflow: hidden;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 0;
  position: relative;
}

.layers-panel-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 10px 12px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.layers-panel--collapsed .layers-panel-inner {
  display: none;
}

.layers-panel-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 2px;
}

.layers-panel-topbar h2 {
  flex: 1;
}

.layers-panel h2 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0;
  padding: 0;
}

.layers-panel-minimize {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.layers-panel-minimize:hover {
  background: var(--border);
  color: var(--text);
}

/* Narrow strip when collapsed (desktop): expand control */
.layers-panel-edge {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  width: 100%;
  flex: 1;
  min-height: 0;
  padding: 12px 6px 12px;
  margin: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  line-height: 1.2;
}

.layers-panel-edge:hover {
  background: var(--bg-3);
  color: var(--accent);
}

.layers-panel-edge-icon {
  font-size: 11px;
  opacity: 0.85;
}

.layers-panel-edge-label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  white-space: nowrap;
  font-weight: 600;
}

.layers-panel--collapsed .layers-panel-edge {
  display: flex;
}

.layers-panel-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.35;
  margin: 0;
}

.mask-shapes-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.mask-shapes-list {
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}

.mask-shapes-list .mask-shapes-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 8px;
  font-size: 12px;
  background: var(--bg-3);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
}

.mask-shapes-list .mask-shapes-list__item--selected {
  border-color: var(--accent);
  background: rgba(0, 212, 255, 0.08);
}

.mask-shapes-list .mask-shapes-list__item--selected .mask-shape-label {
  color: var(--text);
}

.mask-shapes-list .mask-shape-label {
  flex: 1;
  min-width: 0;
  color: var(--text-muted);
}

.layer-toolbar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
}

.layer-toolbar .btn {
  width: 100%;
  padding: 3px 4px;
  font-size: 10px;
  line-height: 1.2;
}

.layer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: 0;
  flex: 1;
  min-height: 0;
}

.layer-row {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  padding: 8px 8px 10px;
  border-radius: var(--radius);
  background: var(--bg-3);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
}

.layer-row-title-row {
  width: 100%;
  min-width: 0;
}

.layer-row-toolbar {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

.layer-row-toolbar > .layer-row-btn:last-child {
  margin-left: auto;
}

.layer-row:hover {
  border-color: var(--border-2);
}

.layer-row.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-dim);
}

.layer-row.is-hidden {
  opacity: 0.45;
}

.layer-row-empty {
  opacity: 0.55;
  font-size: 13px;
  font-weight: 400;
  flex-shrink: 0;
}

.layer-row-move {
  display: flex;
  flex-direction: column;
  gap: 2px;
  justify-content: center;
}

.layer-row-btn--move {
  width: 22px;
  height: 13px;
  min-height: 13px;
  font-size: 10px;
  line-height: 1;
}

.layer-row-btn--move:disabled {
  opacity: 0.25;
  cursor: default;
}

.layer-row-title-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  width: 100%;
}

.layer-row-name-input {
  flex: 1;
  min-width: 0;
  width: 100%;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: 6px;
  padding: 7px 10px;
  margin: 0;
  cursor: text;
  user-select: text;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.layer-row-name-input:hover {
  border-color: var(--text-muted);
}

.layer-row-name-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-dim);
}

.layer-row-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0;
}

.layer-row-btn:hover {
  background: var(--border);
  color: var(--text);
}

.layer-row-btn.is-off {
  opacity: 0.35;
}

.layer-row-btn.is-on {
  color: var(--accent);
}

/* ── Pattern Panel ───────────────────────────────────────────────────────── */

.pattern-panel {
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px;
}

.pattern-panel h2 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 0 2px;
}

.pattern-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.pattern-card {
  background: var(--bg-3);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.pattern-card:hover { border-color: var(--accent-dim); transform: scale(1.02); }
.pattern-card.active { border-color: var(--accent); }
.pattern-card.active .pattern-card-label { color: var(--accent); }

.pattern-card canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1;
}

.pattern-card-label {
  font-size: 10px;
  text-align: center;
  padding: 3px 4px 4px;
  color: var(--text-muted);
  background: rgba(0,0,0,0.4);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Canvas Area ─────────────────────────────────────────────────────────── */

.canvas-area {
  display: flex;
  flex-direction: column;
  background: #040408;
  overflow: hidden;
  min-height: 0;
}

.canvas-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 20px;
  min-height: 0;
}

.canvas-stack {
  position: relative;
  display: inline-block;
  max-width: 100%;
  max-height: 100%;
  vertical-align: middle;
}

.canvas-wrapper.drag-over { background: rgba(0, 212, 255, 0.06); }

#main-canvas,
#mask-paint-overlay {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 0 60px rgba(0,0,0,0.8), 0 0 0 1px var(--border);
  display: block;
}

#mask-paint-overlay {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: multiply;
  box-shadow: none;
}

#mask-paint-overlay.mask-paint-overlay--active {
  pointer-events: auto;
  cursor: crosshair;
}

#mask-shapes-overlay {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
  mix-blend-mode: normal;
  box-shadow: none;
}

#mask-shapes-overlay.mask-shapes-overlay--active {
  pointer-events: auto;
}

.playback-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

#time-scrubber {
  flex: 1;
}

.time-display {
  font-size: 12px;
  color: var(--text-muted);
  min-width: 42px;
  font-variant-numeric: tabular-nums;
}

/* ── Controls Panel ──────────────────────────────────────────────────────── */

.controls-panel {
  background: var(--bg-2);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  min-height: 0;
  min-width: 0;
}

.control-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.control-section h3 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* Collapsible section titles (init adds .section-header to h3) */
.control-section h3.section-header {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text);
  margin-bottom: 0;
}

.section-header {
  margin-bottom: 0 !important;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  padding: 8px 10px 8px 12px;
  margin: 0 -4px 0 -4px;
  border-radius: var(--radius);
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  color: var(--text);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.section-header::after {
  content: '▾';
  color: var(--accent);
  font-size: 13px;
  line-height: 1;
  flex-shrink: 0;
  transform: rotate(0deg);
  transition: transform var(--transition), color var(--transition);
}
.control-section.collapsed .section-header {
  border-left-color: var(--border-2);
  background: var(--bg-2);
}
.control-section.collapsed .section-header::after {
  transform: rotate(-90deg);
  color: var(--text-muted);
}
.section-header:hover,
.section-header:focus {
  background: #1a1a2e;
  border-color: var(--border-2);
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.12);
  outline: none;
}
.section-header:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.section-body {
  margin-top: 12px;
}
.control-section.collapsed .section-body {
  display: none;
}

.control-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
  margin: -6px 0 12px;
}
.control-hint strong { color: var(--text); font-weight: 600; }

/* Animation tab: flat subgroup + nested collapsibles */
.control-subgroup {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.control-subgroup-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.control-subsection {
  margin-bottom: 10px;
}
.control-subsection:last-child {
  margin-bottom: 0;
}
.control-subsection--collapsible .subsection-header {
  margin: 0 0 0 0;
  padding: 6px 8px 6px 10px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  border-radius: var(--radius);
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent-dim);
  transition: background var(--transition), border-color var(--transition);
}
.control-subsection--collapsible .subsection-header::after {
  content: '▾';
  color: var(--accent);
  font-size: 11px;
  line-height: 1;
  flex-shrink: 0;
  transition: transform var(--transition), color var(--transition);
}
.control-subsection--collapsible.collapsed .subsection-header {
  border-left-color: var(--border-2);
  background: var(--bg-2);
  color: var(--text-muted);
}
.control-subsection--collapsible.collapsed .subsection-header::after {
  transform: rotate(-90deg);
  color: var(--text-muted);
}
.control-subsection--collapsible .subsection-header:hover,
.control-subsection--collapsible .subsection-header:focus {
  background: #1a1a2e;
  border-color: var(--border-2);
  outline: none;
}
.control-subsection--collapsible .subsection-header:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.control-subsection--collapsible .subsection-body {
  margin-top: 10px;
}
.control-subsection--collapsible.collapsed .subsection-body {
  display: none;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 9px;
}

.control-group:last-child { margin-bottom: 0; }

.control-group label {
  font-size: 12px;
  color: var(--text);
  min-width: 64px;
  flex-shrink: 0;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.slider-row input[type="range"] { flex: 1; min-width: 0; }

.value-display {
  font-size: 11px;
  color: var(--accent);
  min-width: 34px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ── Inputs ──────────────────────────────────────────────────────────────── */

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: var(--bg-3);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  background: white;
  transform: scale(1.25);
}

select {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 8px;
  border-radius: 5px;
  font-size: 12px;
  flex: 1;
  min-width: 0;
  width: 100%;
  min-height: 32px;
  outline: none;
  cursor: pointer;
}
select:focus { border-color: var(--accent); }

/* Full-width field rows (mapping mode, etc.) — avoids a squeezed <select> in the sidebar */
.control-group--block {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}
.control-group--block > label {
  min-width: 0;
  width: 100%;
}
.control-group--block select,
.control-group--block input[type="text"],
.control-group--block input[type="number"],
.control-group--block textarea {
  flex: none;
  width: 100%;
}

.control-group--block textarea {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 5px;
  font-size: 12px;
  line-height: 1.4;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  min-height: 84px;
  resize: vertical;
  outline: none;
}

.control-group--block textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-dim);
}

/* Palette preset row keeps select + random button on one line */
.palette-row select {
  flex: 1;
  width: auto;
  min-width: 0;
}
.palette-row .btn {
  flex-shrink: 0;
}

input[type="color"] {
  width: 36px;
  height: 26px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  padding: 2px;
}
input[type="color"]:hover { border-color: var(--accent-dim); }

input[type="number"] {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 8px;
  border-radius: 5px;
  font-size: 12px;
  width: 66px;
  outline: none;
  -moz-appearance: textfield;
}
input[type="number"]::-webkit-inner-spin-button { display: none; }
input[type="number"]:focus { border-color: var(--accent); }

/* ── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 13px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 12px;
  transition: var(--transition);
  white-space: nowrap;
  line-height: 1.4;
}
.btn:hover { background: var(--border); border-color: var(--border-2); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  font-weight: 600;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.btn-ghost {
  background: transparent;
  border-color: var(--accent-dim);
  color: var(--accent);
}
.btn-ghost:hover { background: rgba(0,212,255,0.08); }

.btn-sm { padding: 3px 8px; font-size: 11px; }
.btn-icon { padding: 5px 10px; font-size: 15px; }

.upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px dashed var(--accent-dim);
  color: var(--accent);
  padding: 5px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 12px;
  transition: var(--transition);
}
.upload-btn:hover { background: rgba(0,212,255,0.08); border-color: var(--accent); }

/* ── Shape Picker ────────────────────────────────────────────────────────── */

.shape-picker { display: flex; gap: 4px; flex-wrap: wrap; }

.shape-btn {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.2;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 26px;
}
.shape-btn:hover, .shape-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,212,255,0.08);
}

.shape-glyph { line-height: 1; }
.shape-icon {
  width: 14px;
  height: 14px;
  object-fit: contain;
  display: block;
}

.shape-ramp-chip {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 5px;
  padding: 3px 8px;
  min-width: 32px;
  min-height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.shape-ramp-chip input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.shape-ramp-check {
  width: 14px;
  height: 14px;
  border: 1px solid var(--border-2);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: transparent;
  background: var(--bg-2);
  transition: var(--transition);
}

.shape-ramp-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.shape-ramp-chip input[type="checkbox"]:checked ~ .shape-ramp-check {
  background: rgba(0,212,255,0.16);
  border-color: var(--accent);
  color: var(--accent);
}

.shape-ramp-chip input[type="checkbox"]:checked ~ .shape-glyph,
.shape-ramp-chip input[type="checkbox"]:checked ~ .shape-icon {
  color: var(--accent);
  filter: brightness(1.15);
}

.shape-ramp-boundary-wrap {
  margin-top: 8px;
}

.shape-ramp-boundary-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 11px;
  margin-bottom: 6px;
}

.shape-ramp-boundary-bar {
  position: relative;
  height: 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: linear-gradient(90deg, var(--bg-3), var(--bg-2));
  overflow: hidden;
}

.shape-ramp-boundary-seg {
  position: absolute;
  top: 0;
  bottom: 0;
  border-right: 1px solid rgba(255, 255, 255, 0.07);
}

.shape-ramp-boundary-handle {
  position: absolute;
  top: -4px;
  width: 10px;
  height: 26px;
  margin-left: -5px;
  border-radius: 6px;
  border: 1px solid var(--border-2);
  background: var(--bg-2);
  cursor: ew-resize;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.25);
}

.shape-ramp-boundary-handle:hover,
.shape-ramp-boundary-handle.is-dragging {
  border-color: var(--accent);
  background: rgba(0, 212, 255, 0.15);
}

/* ── Toggle ──────────────────────────────────────────────────────────────── */

.toggle { position: relative; display: inline-block; width: 34px; height: 18px; cursor: pointer; }
.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 18px;
  transition: var(--transition);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  left: 2px;
  top: 2px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: var(--transition);
}
.toggle input:checked + .toggle-slider { background: var(--accent-dim); border-color: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(16px); background: var(--accent); }

/* ── Canvas Size ─────────────────────────────────────────────────────────── */

.canvas-size-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  margin-bottom: 9px;
}

.size-preset {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 6px 4px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 10px;
  text-align: center;
  line-height: 1.3;
  transition: var(--transition);
}
.size-preset:hover { border-color: var(--accent-dim); color: var(--text); }
.size-preset small { display: block; color: var(--text-muted); font-size: 9px; }

.custom-size { display: flex; align-items: center; gap: 5px; }
.custom-size span { color: var(--text-muted); }

/* ── Export ──────────────────────────────────────────────────────────────── */

.export-section { background: rgba(0,212,255,0.02); }

.export-format-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 11px;
}

.export-btn {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 9px 6px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 10px;
  text-align: center;
  line-height: 1.4;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.export-btn:hover { border-color: var(--accent-dim); color: var(--text); background: rgba(0,212,255,0.04); }

.export-btn-featured {
  grid-column: span 2;
  border-color: var(--accent-dim);
  background: rgba(0,212,255,0.06);
  color: var(--accent);
  flex-direction: row;
  padding: 10px 12px;
  justify-content: center;
  gap: 8px;
  font-size: 12px;
}
.export-btn-featured:hover { background: rgba(0,212,255,0.12); color: var(--accent-hover); }

.export-icon { font-size: 14px; font-weight: 700; color: var(--accent); }

.export-options { display: flex; gap: 10px; }
.export-options .control-group { flex: 1; flex-direction: column; align-items: flex-start; gap: 4px; }
.export-options input[type="number"] { width: 100%; }

/* ── Access gate (soft client-side lockout; replace with server auth for real security) ─ */

.access-gate {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 12, 0.94);
  backdrop-filter: blur(12px);
}

html.access-unlocked .access-gate {
  display: none !important;
}

.access-gate-card {
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: 12px;
  padding: 28px;
  width: min(360px, calc(100vw - 32px));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.75);
}

.access-gate-card h2 {
  margin: 0 0 18px;
  font-size: 1.15rem;
  font-weight: 600;
}

.access-gate-card form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.access-gate-card label {
  font-size: 12px;
  color: var(--text-muted);
}

.access-gate-card input[type="password"] {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.access-gate-card input[type="password"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.15);
}

.access-gate-error {
  color: #f47171;
  font-size: 13px;
  margin: 0;
}

.access-gate-card .btn-primary {
  margin-top: 4px;
}

/* ── Modals ──────────────────────────────────────────────────────────────── */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(6px);
}
.modal[hidden] { display: none; }

.modal-content {
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: 12px;
  padding: 24px;
  min-width: 300px;
  max-width: 90vw;
  box-shadow: 0 24px 80px rgba(0,0,0,0.7);
}

.modal-large {
  width: min(720px, 92vw);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}
.modal-header h3 { font-size: 15px; font-weight: 600; }

.modal-actions { display: flex; gap: 8px; margin-top: 12px; }

#code-output {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  color: #a0e0c0;
  padding: 12px;
  font-family: 'Consolas', 'SF Mono', monospace;
  font-size: 11px;
  line-height: 1.6;
  border-radius: var(--radius);
  resize: none;
  min-height: 280px;
  overflow: auto;
  tab-size: 2;
}

.progress-bar {
  background: var(--bg-3);
  border-radius: 4px;
  height: 6px;
  margin: 14px 0 10px;
  overflow: hidden;
}
.progress-fill {
  background: linear-gradient(90deg, var(--accent), #aa44ff);
  height: 100%;
  width: 0%;
  transition: width 0.08s;
  border-radius: 4px;
}

/* ── Scrollbar ───────────────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  html, body { overflow: auto; height: auto; }
  .app { height: auto; min-height: 100vh; overflow: visible; }
  .app-body { grid-template-columns: 1fr; grid-template-rows: auto auto 1fr auto; overflow: visible; }
  .app-body.app-body--layers-collapsed {
    grid-template-columns: 1fr;
  }
  .layers-panel { border-right: none; border-bottom: 1px solid var(--border); }
  .layers-panel--collapsed {
    flex-direction: row;
    max-height: none;
    min-height: auto;
  }
  .layers-panel--collapsed .layers-panel-edge {
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 10px;
    width: 100%;
    min-height: 44px;
    padding: 8px 12px;
    flex: none;
  }
  .layers-panel-edge-label {
    writing-mode: horizontal-tb;
    transform: none;
    letter-spacing: 0.12em;
  }
  .pattern-panel { border-right: none; border-bottom: 1px solid var(--border); }
  .pattern-grid { grid-template-columns: repeat(6, 1fr); }
  .canvas-area { min-height: 50vw; }
  .controls-panel { border-left: none; border-top: 1px solid var(--border); }
}

@media (max-width: 500px) {
  .pattern-grid { grid-template-columns: repeat(4, 1fr); }
  .app-header h1 { font-size: 15px; }
  .app-body { grid-template-columns: 1fr; }
}