:root {
  color-scheme: light;
  --paper: #f4ecd9;
  --panel: #f8f0e1;
  --ink: #171514;
  --red: #9d312d;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
}

button,
input {
  font: inherit;
}

.app {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr);
  width: 100vw;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  height: 100vh;
  min-height: 0;
  max-height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  color: #231e19;
  background: linear-gradient(180deg, #fff8ec, #e6d8c5);
  border-right: 1px solid rgba(36, 28, 20, 0.14);
  box-shadow: 14px 0 45px rgba(72, 50, 24, 0.12);
  z-index: 2;
}

.panel-scroll {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
}

.panel::-webkit-scrollbar {
  width: 10px;
}

.panel::-webkit-scrollbar-track {
  background: rgba(90, 67, 42, 0.08);
}

.panel::-webkit-scrollbar-thumb {
  background: rgba(87, 61, 36, 0.34);
  border: 2px solid rgba(255, 248, 236, 0.72);
  border-radius: 999px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.panel-window-actions {
  display: none;
  margin-left: auto;
  gap: 6px;
}

.panel-window-actions button,
.panel-reopen {
  min-width: 34px;
  min-height: 34px;
  border: 1px solid rgba(35, 29, 23, 0.18);
  border-radius: 7px;
  color: #241f1a;
  background: rgba(255, 248, 237, 0.92);
}

.stamp {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 7px;
  color: #fff8ec;
  background: var(--red);
  font-family: "Songti SC", "STSong", serif;
  font-size: 27px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 23px;
  letter-spacing: 0;
}

.brand p {
  margin-top: 3px;
  color: #7b6b58;
  font-size: 12px;
}

.brand .build-id {
  color: #9d312d;
  font-weight: 700;
}

.group {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid rgba(35, 29, 23, 0.13);
  border-radius: 8px;
  background: rgba(255, 252, 245, 0.66);
}

.group h2 {
  color: #5e503f;
  font-size: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: #4f4235;
  font-size: 13px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--red);
}

.preset-grid,
.tool-grid,
.edit-grid {
  display: grid;
  gap: 7px;
}

.preset-grid {
  grid-template-columns: repeat(4, 1fr);
}

.tool-grid,
.edit-grid {
  grid-template-columns: repeat(3, 1fr);
}

.tool-grid {
  grid-template-columns: repeat(4, 1fr);
}

.preset-grid button,
.tool-grid button,
.edit-grid button,
.actions button {
  min-height: 34px;
  border: 1px solid rgba(35, 29, 23, 0.18);
  border-radius: 7px;
  color: #241f1a;
  background: #fff8ed;
  cursor: pointer;
}

.tool-grid button.active {
  color: #fff8ed;
  background: #9d312d;
  border-color: #9d312d;
}

.edit-grid button {
  background: #f4ead9;
}

.actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: auto;
  padding-bottom: 2px;
}

.actions button {
  color: #fff8ed;
  background: #1c1a18;
}

.stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--paper);
}

canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

canvas.is-selecting {
  cursor: grab;
}

canvas.is-panning {
  cursor: move;
}

canvas.is-erasing {
  cursor: cell;
}

.version-badge {
  position: absolute;
  z-index: 5;
  right: 14px;
  bottom: 12px;
  padding: 5px 8px;
  border-radius: 5px;
  color: rgba(40, 32, 24, 0.62);
  background: rgba(255, 248, 236, 0.72);
  font-size: 12px;
  pointer-events: none;
}

.panel-reopen {
  display: none;
  position: absolute;
  z-index: 8;
  left: 14px;
  bottom: 14px;
  padding: 0 12px;
  font-weight: 700;
  box-shadow: 0 10px 28px rgba(46, 34, 20, 0.18);
}

@media (max-width: 820px) {
  .app {
    display: block;
  }

  .panel {
    position: fixed;
    z-index: 10;
    right: 12px;
    bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 12px;
    width: min(440px, calc(100vw - 24px));
    height: auto;
    max-height: min(72vh, 620px);
    overflow: hidden;
    border: 1px solid rgba(36, 28, 20, 0.16);
    border-radius: 12px;
    box-shadow: 0 18px 55px rgba(45, 32, 18, 0.28);
    transform-origin: right bottom;
  }

  .brand,
  .actions {
    grid-column: auto;
  }

  .brand {
    flex: 0 0 auto;
  }

  .panel-scroll {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(250px, 82vw);
    gap: 12px;
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
    padding-bottom: 6px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }

  .panel-scroll > .group,
  .panel-scroll > .actions {
    max-height: min(54vh, 480px);
    overflow-y: auto;
    scroll-snap-align: start;
  }

  .panel-window-actions,
  .panel-reopen {
    display: flex;
  }

  .panel.is-minimized {
    width: min(300px, calc(100vw - 24px));
    max-height: none;
    overflow: hidden;
  }

  .panel.is-minimized .group,
  .panel.is-minimized .actions,
  .panel.is-minimized .panel-scroll {
    display: none;
  }

  .panel.is-closed {
    display: none;
  }

  .stage {
    width: 100vw;
    height: 100vh;
  }

  .version-badge {
    right: 12px;
    top: 12px;
    bottom: auto;
  }
}