:root {
  color-scheme: light;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
  --bg-color: #f4f6fb;
  --grid-color: rgba(60, 100, 240, 0.08);
  --grid-thick-color: rgba(60, 100, 240, 0.15);
  --block-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-color);
  color: #1c2540;
}

.app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  max-height: 100vh;
  overflow: hidden;
  position: relative;
}

.palette {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: auto;
  max-width: calc(100% - 32px);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 3;
  pointer-events: none;
}

.palette__header {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.palette__title {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
}

.palette__hint {
  margin: 0;
  font-size: 13px;
  color: #5a6789;
  white-space: nowrap;
}

.palette__list {
  pointer-events: auto;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 6px;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.palette__item {
  flex: 0 0 auto;
  border: none;
  padding: 2px 4px;
  border-radius: 10px;
  background: rgba(107, 142, 255, 0.1);
  cursor: grab;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 120ms ease, box-shadow 120ms ease;
  touch-action: pan-x;
  scroll-snap-align: start;
  box-shadow: 0 2px 6px rgba(31, 59, 187, 0.08);
}

.palette__item:active {
  cursor: grabbing;
}

.palette__item span {
  display: none;
}

.palette__shape {
  position: relative;
  pointer-events: none;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
  transform-origin: center;
}

.palette__trash {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: 16px;
  background: rgba(255, 99, 71, 0.16);
  color: #c0392b;
  font-weight: 600;
  box-shadow: 0 2px 10px rgba(192, 57, 43, 0.18);
  opacity: 0;
  pointer-events: none;
  transform: scale(0.94);
  transition:
    transform 120ms ease,
    box-shadow 120ms ease,
    background-color 120ms ease,
    opacity 120ms ease;
  z-index: 2;
}

.palette__trash-icon {
  font-size: 24px;
}

.palette__trash-label {
  letter-spacing: 1px;
}

.palette--delete-mode .palette__list {
  pointer-events: none;
  visibility: hidden;
}

.palette--delete-mode .palette__trash {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1.05);
  background: rgba(255, 99, 71, 0.28);
  box-shadow: 0 4px 18px rgba(192, 57, 43, 0.22);
}

.palette {
  --palette-scale: 0.52;
}

@media (pointer: coarse) {
  .palette {
    --palette-scale: 0.42;
  }
}

.palette__item .block {
  pointer-events: none;
  width: auto;
  height: auto;
  transform: none;
}

.palette__item .block--square {
  width: calc(120px * var(--palette-scale));
  height: calc(120px * var(--palette-scale));
}

.palette__item .block--rectangle {
  width: calc(180px * var(--palette-scale));
  height: calc(120px * var(--palette-scale));
}

.palette__item .block--equilateral {
  width: calc(120px * var(--palette-scale));
  height: calc(104px * var(--palette-scale));
}

.palette__item .block--isosceles {
  width: calc(120px * var(--palette-scale));
  height: calc(240px * var(--palette-scale));
}

.palette__item .block--right-iso {
  width: calc(120px * var(--palette-scale));
  height: calc(120px * var(--palette-scale));
}

.palette__item .block--semicircle {
  width: calc(240px * var(--palette-scale));
  height: calc(120px * var(--palette-scale));
  border-radius:
    calc(120px * var(--palette-scale))
    calc(120px * var(--palette-scale))
    0
    0;
}

.workspace {
  position: relative;
  flex: 1;
  overflow: hidden;
  background: #eef2ff;
  touch-action: none;
  cursor: grab;
}

.workspace.is-panning {
  cursor: grabbing;
}

.workspace__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(0deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-thick-color) 1px, transparent 1px),
    linear-gradient(0deg, var(--grid-thick-color) 1px, transparent 1px);
  background-size:
    40px 40px,
    40px 40px,
    200px 200px,
    200px 200px;
  pointer-events: none;
  z-index: 0;
}

.canvas {
  position: absolute;
  inset: 0;
  transform: translate3d(0, 0, 0);
  transform-origin: 0 0;
  touch-action: none;
  z-index: 1;
}

.quick-actions {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  z-index: 4;
}

.quick-actions__toggle {
  width: 52px;
  height: 52px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, #6b8eff, #4f63ff);
  color: #fff;
  font-size: 26px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 24px rgba(31, 59, 187, 0.24);
  cursor: pointer;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease;
  position: relative;
}

.quick-actions__toggle:active {
  transform: scale(0.96);
  box-shadow: 0 4px 14px rgba(31, 59, 187, 0.3);
}

.quick-actions__toggle:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.7);
  outline-offset: 3px;
}

.quick-actions__toggle-label {
  position: absolute;
  clip: rect(0, 0, 0, 0);
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  white-space: nowrap;
}

.quick-actions__menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
  transform: translateY(-8px) scale(0.96);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 140ms ease,
    transform 160ms cubic-bezier(0.2, 0.8, 0.3, 1.2);
  min-width: 140px;
}

.quick-actions--open .quick-actions__menu {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: auto;
}

.quick-actions__option {
  display: flex;
  align-items: center;
  gap: 8px;
  border: none;
  background: transparent;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 14px;
  color: #1c2540;
  cursor: pointer;
  transition: background 120ms ease;
}

.quick-actions__option:hover,
.quick-actions__option:focus-visible {
  background: rgba(107, 142, 255, 0.15);
  outline: none;
}

.quick-actions__option-icon {
  width: 24px;
  height: 24px;
  border-radius: 12px;
  background: linear-gradient(135deg, #6b8eff, #4f63ff);
  flex-shrink: 0;
  position: relative;
}

.quick-actions__option-icon::before,
.quick-actions__option-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.quick-actions__option-icon::before {
  width: 12px;
  height: 8px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.92);
}

.quick-actions__option-icon::after {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #4f63ff;
}

.quick-actions__toggle-icon {
  line-height: 1;
}

.block {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  font-size: 14px;
  font-weight: 600;
  pointer-events: none;
}

.palette__item .block {
  pointer-events: none;
}

.canvas-block {
  position: absolute;
  cursor: grab;
  pointer-events: auto;
  touch-action: none;
  box-shadow: var(--block-shadow);
  transform-origin: center;
}

.canvas-block.is-deleting {
  pointer-events: none;
}

.canvas-block:active {
  cursor: grabbing;
}

.block--square {
  width: 120px;
  height: 120px;
  background: #6b8eff;
}

.block--rectangle {
  width: 180px;
  height: 120px;
  background: #ffa768;
}

.block--equilateral {
  width: 120px;
  height: 104px;
  background: #74d483;
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}

.block--isosceles {
  width: 120px;
  height: 240px;
  background: #ff8194;
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}

.block--right-iso {
  width: 120px;
  height: 120px;
  background: #b88cff;
  clip-path: polygon(0% 100%, 100% 100%, 0% 0%);
}

.block--semicircle {
  width: 240px;
  height: 120px;
  background: #6cc8ff;
  border-radius: 120px 120px 0 0;
}

.canvas-block.is-snapping {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.6), 0 4px 18px rgba(0, 0, 0, 0.18);
}

.canvas-block.block--square.is-snapping,
.canvas-block.block--rectangle.is-snapping {
  box-shadow: var(--block-shadow);
}

.block--preview {
  position: absolute;
  pointer-events: none;
  transform-origin: center;
  z-index: 3;
  display: block;
}

.block--preview svg {
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

.radial-menu {
  position: fixed;
  display: flex;
  align-items: stretch;
  gap: 8px;
  padding: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px) scale(0.92);
  transition:
    opacity 150ms ease,
    transform 180ms cubic-bezier(0.2, 0.8, 0.3, 1.2);
  z-index: 20;
}

.radial-menu--visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.radial-menu__bg {
  display: none;
}

.radial-menu__panel {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

.radial-menu__panel--actions {
  gap: 8px;
}

.radial-menu__panel--colors {
  gap: 6px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 32px rgba(60, 100, 240, 0.18);
}

.radial-menu__item {
  position: relative;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6b8eff, #4f63ff);
  box-shadow: 0 2px 8px rgba(31, 59, 187, 0.24);
  cursor: pointer;
  transition:
    box-shadow 120ms ease,
    background 160ms ease;
  opacity: 0;
  transform: translateY(14px) scale(0.85);
}

.radial-menu__item:active {
  box-shadow: 0 6px 16px rgba(31, 59, 187, 0.3);
}

.radial-menu__item--color {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.9);
  background: var(--radial-color, #ffffff);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  transition:
    box-shadow 160ms ease,
    transform 160ms ease;
}

.radial-menu__item--color:active {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
  transform: translateY(1px);
}

.radial-menu--visible .radial-menu__item {
  animation: radial-menu-pop-in 200ms cubic-bezier(0.2, 0.8, 0.3, 1.4) forwards;
}

.radial-menu--visible .radial-menu__item:nth-of-type(1) {
  animation-delay: 0ms;
}

.radial-menu--visible .radial-menu__item:nth-of-type(2) {
  animation-delay: 40ms;
}

.radial-menu--visible .radial-menu__item:nth-of-type(3) {
  animation-delay: 80ms;
}

.radial-menu--leaving .radial-menu__item {
  animation: radial-menu-pop-out 150ms cubic-bezier(0.4, 0, 0.6, 1) forwards;
}

@keyframes radial-menu-pop-in {
  0% {
    opacity: 0;
    transform: translateY(14px) scale(0.85);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes radial-menu-pop-out {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(10px) scale(0.9);
  }
}

.radial-menu__item--ccw {
  background: linear-gradient(135deg, #ffa86c, #ff7f50);
}

.radial-menu__item--cw {
}