:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #cbd5e1;
  --text: #0f172a;
  --text-muted: #475569;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --danger: #b91c1c;
  --shadow: 0 10px 30px color-mix(in oklab, var(--text) 10%, transparent);
  --radius: 0.875rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #020617;
    --surface: #0f172a;
    --surface-2: #1e293b;
    --border: #334155;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #2dd4bf;
    --accent-strong: #14b8a6;
    --danger: #f87171;
    --shadow: 0 16px 34px color-mix(in oklab, #000 45%, transparent);
  }
}

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

html, body {
  margin: 0;
  min-height: 100dvh;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(140% 100% at 10% -20%, color-mix(in oklab, var(--accent) 16%, var(--bg)), transparent 70%),
    radial-gradient(120% 80% at 100% 120%, color-mix(in oklab, var(--accent) 8%, var(--bg)), transparent 65%),
    var(--bg);
  color: var(--text);
  padding: 1rem;
}

body.page-dragover {
  outline: 2px dashed color-mix(in oklab, var(--accent) 70%, var(--border));
  outline-offset: -0.6rem;
}

.app {
  max-width: 86rem;
  height: calc(100dvh - 2rem);
  margin-inline: auto;
  display: grid;
  grid-template-rows: minmax(0, 1fr);
  gap: 1rem;
}

.panel {
  background: color-mix(in oklab, var(--surface) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.875rem;
}

.button-row {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 0.625rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background-color 120ms ease;
}

select {
  appearance: none;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  background: var(--surface-2);
  color: var(--text);
  padding: 0.45rem 0.65rem;
  font-size: 0.9rem;
}

button:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.path-context-menu {
  position: fixed;
  z-index: 60;
  min-width: 11.5rem;
  display: grid;
  gap: 0.35rem;
  padding: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  background: color-mix(in oklab, var(--surface) 96%, transparent);
  box-shadow: 0 14px 32px color-mix(in oklab, var(--text) 18%, transparent);

  & button {
    width: 100%;
    justify-content: flex-start;
    text-align: left;
    padding: 0.42rem 0.55rem;
    font-size: 0.84rem;
    transform: none;
  }
}

.path-context-menu.is-hidden {
  display: none;
}

.workspace {
  display: grid;
  gap: 1rem;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.stack {
  display: grid;
  gap: 0.75rem;
  min-height: 0;
}

.section-title {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.canvas-wrap,
.preview-wrap {
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 0.2rem);
  background: linear-gradient(
    45deg,
    color-mix(in oklab, var(--surface-2) 72%, transparent) 25%,
    transparent 25%,
    transparent 50%,
    color-mix(in oklab, var(--surface-2) 72%, transparent) 50%,
    color-mix(in oklab, var(--surface-2) 72%, transparent) 75%,
    transparent 75%,
    transparent
  ) 0 0 / 16px 16px,
  var(--surface);
  min-height: 14rem;
  overflow: hidden;
}

.canvas-wrap.dragover {
  border-color: var(--accent);
  background:
    linear-gradient(
      45deg,
      color-mix(in oklab, var(--accent) 18%, var(--surface-2)) 25%,
      transparent 25%,
      transparent 50%,
      color-mix(in oklab, var(--accent) 18%, var(--surface-2)) 50%,
      color-mix(in oklab, var(--accent) 18%, var(--surface-2)) 75%,
      transparent 75%,
      transparent
    ) 0 0 / 16px 16px,
    var(--surface);
}

#sourceCanvas {
  display: block;
  width: 100%;
  max-height: 100%;
  object-fit: contain;
  margin-inline: auto;
  background: white;
}

.controls {
  display: grid;
  gap: 0.75rem;

  & .control {
    display: grid;
    gap: 0.35rem;
  }

  & label {
    cursor: pointer;
    user-select: none;
    display: flex;
    gap: 0.75rem;
    font-size: 0.9rem;
  }

  & .value {
    font-variant-numeric: tabular-nums;
    color: var(--text-muted);
  }

  & input[type="range"] {
    width: 100%;
  }

  & input[type="color"] {
    width: 100%;
    min-height: 2rem;
    display: block;
    border: 1px solid var(--border);
    border-radius: 0.625rem;
    background: var(--surface-2);
    padding: 0.15rem;
  }

  & .checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);

    &:has([disabled]) {
      color: #ccc;
    }
  }
}

.controls.compact {
  gap: 0.6rem;
}

.palette-control {
  position: relative;
}

.palette-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.palette-swatch {
  --swatch: #000000;
  width: 1.7rem;
  height: 1.7rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--text) 25%, var(--border));
  background: var(--swatch);
  position: relative;
  display: inline-grid;
  place-items: center;
  transform: none;

  & .palette-swatch-index {
    color: color-mix(in oklab, var(--text) 85%, #fff 15%);
    font-size: 0.58rem;
    font-weight: 700;
    text-shadow: 0 1px 1px color-mix(in oklab, #000 30%, transparent);
    pointer-events: none;
  }
}

.palette-swatch:hover {
  transform: translateY(-1px);
}

.palette-swatch.is-locked {
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--accent) 42%, transparent);
}

.palette-swatch.is-dominant:not(.is-locked) {
  opacity: 0.65;
}

.palette-picker-input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
  inset: auto auto 0 0;
}

.path-editor {
  display: grid;
  gap: 0.65rem;
}

.path-editor-content {
  display: grid;
  gap: 0.65rem;
}

.path-editor-content.is-hidden {
  display: none;
}

.path-editor-hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.path-editor-hint.is-hidden {
  display: none;
}

.smooth-node-hint {
  font-variant-numeric: tabular-nums;
}

.control-group {
  display: grid;
  gap: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.55rem;
  background: color-mix(in oklab, var(--surface-2) 54%, transparent);
}

.control-group.is-hidden {
  display: none;
}

.group-title {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.button-row.compact {
  margin-top: 0;
  gap: 0.4rem;
}

.path-list {
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  background: color-mix(in oklab, var(--surface-2) 72%, transparent);
  min-height: 4.5rem;
  max-height: 12rem;
  overflow: auto;
  display: grid;
  gap: 0.35rem;
  padding: 0.45rem;
}

.path-list.is-dragging .path-item {
  transition: border-color 90ms ease, background-color 90ms ease;
}

.path-list-empty {
  color: var(--text-muted);
  font-size: 0.84rem;
  text-align: center;
  align-self: center;
}

.path-item {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 0.45rem;
  padding: 0.35rem 0.45rem;
  cursor: pointer;
  color: var(--text);
  text-align: left;
  font-size: 0.83rem;
  display: grid;
  gap: 0.18rem;

  & strong {
    font-size: 0.84rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
  }

  & .meta {
    color: var(--text-muted);
    font-size: 0.78rem;
  }

  & .swatch {
    width: 0.72rem;
    height: 0.72rem;
    border-radius: 999px;
    border: 1px solid color-mix(in oklab, var(--text) 22%, var(--border));
    background: var(--swatch, #000000);
    display: inline-block;
  }

  & .drag-handle {
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    margin-right: 0.1rem;
    cursor: grab;
    user-select: none;
  }
}

.path-item:hover {
  transform: none;
  border-color: var(--accent);
}

.path-item:active {
  transform: none;
}

.path-item.active {
  border-color: var(--accent);
  background: color-mix(in oklab, var(--accent) 14%, var(--surface));
}

.path-item.is-hovered:not(.active) {
  border-color: color-mix(in oklab, var(--accent) 65%, var(--border));
  background: color-mix(in oklab, var(--accent) 8%, var(--surface));
}

.path-item.is-dragging {
  opacity: 0.48;
}

.path-item.drop-before {
  box-shadow: inset 0 2px 0 color-mix(in oklab, var(--accent) 88%, var(--border));
}

.path-item.drop-after {
  box-shadow: inset 0 -2px 0 color-mix(in oklab, var(--accent) 88%, var(--border));
}

.preview-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;

  & .toolbar-slider {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-muted);
    font-size: 0.84rem;

    & input[type="range"] {
      width: 7rem;
    }
  }

  & .preview-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;

    & .svg-size {
      color: var(--text-muted);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 0.25rem 0.45rem;
      border: 1px solid var(--border);
      border-radius: 0.45rem;
      background: color-mix(in oklab, var(--surface-2) 72%, transparent);
      white-space: nowrap;
    }
  }
}

.preview-wrap {
  position: relative;
  min-height: 0;
  height: 100%;
  cursor: grab;
  touch-action: none;

  &:active {
    cursor: grabbing;
  }
}

.preview-wrap.is-space-pan,
.preview-wrap.is-space-pan * {
  cursor: grab;
}

.preview-wrap.is-space-pan:active,
.preview-wrap.is-space-pan:active *,
.preview-wrap.is-panning,
.preview-wrap.is-panning * {
  cursor: grabbing;
}

.preview-wrap.use-light-bg {
  background: linear-gradient(
    45deg,
    #f1f5f9 25%,
    transparent 25%,
    transparent 50%,
    #f1f5f9 50%,
    #f1f5f9 75%,
    transparent 75%,
    transparent
  ) 0 0 / 16px 16px,
  #ffffff;
}

body.is-node-dragging #previewWrap,
body.is-node-dragging #previewWrap *,
body.is-node-dragging #previewStage,
body.is-node-dragging #previewStage *,
body.is-node-dragging #previewStage .trace-node {
  cursor: none;
}

#previewViewport {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
  transform-origin: 0 0;
}

.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  height: 100%;
  min-height: 0;
}

.controls-panel .path-editor {
  flex: 1 0 16rem;
}

.controls-panel .path-list {
  min-height: 0;
  max-height: 50vh;
}

.workspace > .stack:not(.controls-panel) {
  height: 100%;
  min-height: 20rem;
  grid-template-rows: auto auto minmax(20rem, 1fr);
}

.onion-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  opacity: 0;
  transition: opacity 120ms ease;
}

.onion-image.visible {
  opacity: 0.3;
}

#previewStage {
  position: absolute;
  inset: 0;
  min-height: 20rem;

  & svg {
    display: block;
    width: 100%;
    height: 100%;
  }

  & .trace-shape {
    cursor: pointer;
  }

  & .trace-hit {
    cursor: pointer;
  }

  & .trace-selection {
    pointer-events: none;
  }

  & .trace-node {
    cursor: grab;
  }

  & .trace-node:active {
    cursor: grabbing;
  }

  & .trace-shape.is-selected {
    stroke: #ef4444;
    stroke-width: 1.4;
    vector-effect: non-scaling-stroke;
  }

  & .trace-shape.is-hovered:not(.is-selected) {
    stroke: #f59e0b;
    stroke-width: 1.2;
    vector-effect: non-scaling-stroke;
  }

  & .trace-hit.is-hovered:not(.is-selected) {
    fill: none;
    stroke: #f59e0b;
    stroke-width: 1.2;
    vector-effect: non-scaling-stroke;
  }

  & .trace-node.is-hovered {
    stroke: #f59e0b;
    stroke-width: 1.6;
  }

  & .trace-node.is-smooth-selected:not(.is-dragging) {
    fill: #34d399;
    stroke: #047857;
    stroke-width: 1.65;
  }

  & .trace-node.is-dragging {
    fill: #f59e0b;
    stroke: #b45309;
    stroke-width: 1.8;
  }

  & .placeholder {
    height: 100%;
    min-height: 20rem;
    display: grid;
    place-items: center;
    color: var(--text-muted);
    font-size: 0.95rem;
    padding: 1rem;
    text-align: center;
  }
}

.toast-root {
  position: fixed;
  top: 0.9rem;
  right: 0.9rem;
  z-index: 120;
  display: grid;
  gap: 0.45rem;
  width: min(26rem, calc(100vw - 1.8rem));
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  border: 1px solid var(--border);
  border-left: 3px solid color-mix(in oklab, var(--accent) 70%, var(--border));
  border-radius: 0.6rem;
  padding: 0.55rem 0.65rem;
  background: color-mix(in oklab, var(--surface) 94%, transparent);
  color: var(--text);
  box-shadow: 0 14px 30px color-mix(in oklab, var(--text) 16%, transparent);
  font-size: 0.82rem;
  line-height: 1.35;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 140ms ease, transform 140ms ease;
}

.toast.is-error {
  border-left-color: color-mix(in oklab, var(--danger) 80%, var(--border));
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 56rem) {
  body {
    padding: 1.5rem;
    overflow: hidden;
  }

  .app {
    height: calc(100dvh - 3rem);
  }

  .workspace {
    grid-template-columns: minmax(18rem, 24rem) minmax(0, 1fr);
    align-items: stretch;
  }

  .panel {
    padding: 1rem;
  }

  .controls-panel {
    height: 100%;
    overflow: auto;
    overscroll-behavior: contain;
  }

  .workspace > .panel {
    height: 100%;
    min-height: 0;
  }

}