:root {
  color-scheme: dark;
  --bg: #0a0a0b;
  --bg-elev: #121214;
  --bg-subtle: #1a1a1e;
  --fg: #f4f4f5;
  --mut: #a1a1aa;
  --subtle: #71717a;
  --border: color-mix(in oklab, var(--fg) 14%, transparent);
  --accent: #c8ccd4;
  --accent-fg: #0a0a0b;
  --paper: #e7dfd2;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --motion-fast: 250ms;
  --motion-quick: 150ms;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
* { box-sizing: border-box; }
html, body {
  height: 100%;
  margin: 0;
  background: var(--paper);
  color: var(--fg);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}
.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}
#host, #overlay {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}
#host { z-index: 1; touch-action: none; cursor: crosshair; }
#overlay { z-index: 2; pointer-events: none; background: transparent; }
.hud { position: fixed; inset: 0; pointer-events: none; z-index: 4; }

.topbar, .dock, .panel, .toast, .hint, .sheetInner, .sheetBack { pointer-events: auto; }

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  padding: max(10px, env(safe-area-inset-top)) 12px 10px;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--border);
}
.grow { flex: 1; min-width: 8px; }

.toggle {
  appearance: none;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg);
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.toggle .toggleState {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mut);
}
.toggle.on {
  background: var(--fg);
  color: var(--accent-fg);
  border-color: transparent;
}
.toggle.on .toggleState { color: var(--accent-fg); }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg);
  min-height: 44px;
  min-width: 44px;
  padding: 0 12px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.4; }
.btnPrimary { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
.btnSmall { min-height: 36px; min-width: 36px; padding: 0 10px; font-size: 12px; }
.tool.on, .well.on, .layerRow.on {
  box-shadow: inset 0 0 0 2px var(--fg);
}

.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px max(12px, env(safe-area-inset-bottom));
  background: color-mix(in oklab, var(--bg) 94%, transparent);
  border-top: 1px solid var(--border);
}
.toolRow, .colorRow, .sliderRow {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.well {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  border: 2px solid color-mix(in oklab, var(--fg) 35%, transparent);
  padding: 0;
  cursor: pointer;
}
.well[data-color="#000000"] { background: #000000; }
.well[data-color="#E69F00"] { background: #E69F00; }
.well[data-color="#56B4E9"] { background: #56B4E9; }
.well[data-color="#009E73"] { background: #009E73; }
.well[data-color="#F0E442"] { background: #F0E442; }
.well[data-color="#0072B2"] { background: #0072B2; }
.well[data-color="#D55E00"] { background: #D55E00; }
.well[data-color="#CC79A7"] { background: #CC79A7; }
.well[data-color="#FFFFFF"] { background: #FFFFFF; }
.well[data-color="#e7dfd2"] { background: #e7dfd2; }
.pickerWrap {
  width: 32px;
  height: 32px;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.pickerWrap input {
  width: 48px;
  height: 48px;
  border: 0;
  padding: 0;
  transform: translate(-8px, -8px);
  cursor: pointer;
}
.colorName {
  font-size: 12px;
  color: var(--mut);
  min-width: 72px;
}
.slider {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--mut);
  flex: 1;
  min-width: 140px;
}
.slider input { flex: 1; min-height: 44px; }
.slider strong { color: var(--fg); font-variant-numeric: tabular-nums; min-width: 2.4em; }

.toast {
  position: fixed;
  left: 50%;
  top: max(64px, calc(env(safe-area-inset-top) + 52px));
  transform: translateX(-50%);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 13px;
}
.hint {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  padding: 0.7rem 1rem;
  max-width: min(360px, calc(100vw - 32px));
  text-align: center;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  color: var(--fg);
  font-size: 14px;
  line-height: 1.45;
  pointer-events: none;
}
.hint.gone { opacity: 0; transition: opacity var(--motion-fast) var(--ease); }
.hidden { display: none !important; }

.panel {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(400px, 92vw);
  background: var(--bg);
  border-left: 1px solid var(--border);
  transform: translateX(100%);
  transition: transform var(--motion-fast) var(--ease);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px 16px max(18px, env(safe-area-inset-bottom));
  pointer-events: none;
  overflow: auto;
  z-index: 5;
}
.panel.open { transform: translateX(0); pointer-events: auto; }
.panelHead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  padding-top: env(safe-area-inset-top);
}
.panelLead, .panelFoot { margin: 0; color: var(--mut); font-size: 13px; line-height: 1.5; }
.panelFoot { margin-top: auto; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.label { min-width: 96px; color: var(--mut); font-size: 13px; }
.layerList { display: flex; flex-direction: column; gap: 8px; }
.layerRow {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 6px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-elev);
}
.layerName {
  flex: 1;
  text-align: left;
  background: none;
  border: 0;
  color: var(--fg);
  min-height: 36px;
  cursor: pointer;
  font-size: 14px;
}

.sheetBack {
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 0.55);
  z-index: 6;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-fast) var(--ease);
}
.sheetBack.open { opacity: 1; pointer-events: auto; }
.sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 7;
  pointer-events: none;
  transform: translateY(18px);
  opacity: 0;
  transition: transform var(--motion-fast) var(--ease), opacity var(--motion-fast) var(--ease);
}
.sheet.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.sheetInner {
  margin: 0 auto;
  max-width: 440px;
  padding: 24px 20px max(24px, env(safe-area-inset-bottom));
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-bottom: 0;
  border-radius: 24px 24px 0 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sheetIcon { width: 72px; height: 72px; border-radius: 16px; object-fit: cover; }
.sheetKicker {
  margin: 4px 0 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mut);
}
.sheet h2 { margin: 0; font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; }
.sheetLead { margin: 0; color: var(--mut); font-size: 14px; line-height: 1.5; }
.steps { margin: 4px 0 8px; padding-left: 1.2rem; color: var(--fg); font-size: 14px; line-height: 1.55; }
.sheetInner .btn { width: 100%; }

@media (prefers-reduced-motion: reduce) {
  .panel, .hint, .sheet, .sheetBack { transition: none; }
}
@media (max-width: 520px) {
  .topbar .btn { padding: 0 10px; }
}