:root {
  color-scheme: light;
  --panel: #ffffff;
  --panel-strong: #f7f8fa;
  --line: #d8dde5;
  --text: #20252b;
  --muted: #68717c;
  --amber: #2f343a;
  --amber-soft: #2f343a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f5f7fa;
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
  min-height: 100vh;
  padding: 18px;
}

.stage-panel,
.control-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 24px 70px rgb(30 41 59 / 12%);
}

.stage-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.stage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.1;
  letter-spacing: 0;
}

p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.status-light {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--amber);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  white-space: nowrap;
}

.status-light span {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--amber);
  box-shadow: 0 0 18px rgb(47 52 58 / 28%);
}

.board-wrap {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: 10px;
  background:
    radial-gradient(circle at center, rgb(148 163 184 / 18%), transparent 42%),
    linear-gradient(180deg, #ffffff, #eef1f5);
}

.board {
  display: grid;
  gap: 2px;
  width: 100%;
  max-width: 100%;
  height: auto;
  padding: 4px;
  overflow: hidden;
  border: 1px solid #cbd3dd;
  border-radius: 5px;
  background: #d9dee5;
  aspect-ratio: var(--board-aspect, 54 / 23.6);
}

.flap {
  position: relative;
  contain: strict;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid #b9c1cc;
  border-radius: 3px;
  background: linear-gradient(#ffffff, #e9edf2);
  color: var(--amber-soft);
  font-family: "Courier New", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--tile-font-size, 10px);
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 1px 0 rgb(255 255 255 / 70%);
  transform-style: preserve-3d;
}

.flap::before,
.flap::after {
  position: absolute;
  right: 0;
  left: 0;
  content: "";
  pointer-events: none;
}

.flap::before {
  top: 50%;
  height: 1px;
  background: rgb(72 79 88 / 42%);
  box-shadow: 0 -1px 0 rgb(255 255 255 / 65%);
}

.flap::after {
  top: 0;
  height: 50%;
  background: rgb(255 255 255 / 35%);
}

.flap.block-divider {
  border-left-color: #8f98a3;
  box-shadow: none;
}

.flap span {
  position: relative;
  z-index: 1;
}

.flap.flipping {
  animation: flap-snap 72ms linear;
}

.board.is-dense {
  gap: 1px;
  padding: 2px;
}

.board.is-dense .flap {
  border: 0;
  border-radius: 1px;
  text-shadow: none;
}

.board.is-dense .flap::before,
.board.is-dense .flap::after {
  display: none;
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  padding: 16px;
}

.preview-stack {
  display: grid;
  gap: 10px;
}

.preview-box {
  position: relative;
  overflow: hidden;
  border: 1px solid #d8dde5;
  border-radius: 6px;
  background:
    linear-gradient(45deg, #eef1f5 25%, transparent 25%),
    linear-gradient(-45deg, #eef1f5 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #eef1f5 75%),
    linear-gradient(-45deg, transparent 75%, #eef1f5 75%),
    #ffffff;
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-size: 20px 20px;
}

.preview-box span {
  display: block;
  border-bottom: 1px solid #d8dde5;
  background: rgb(255 255 255 / 58%);
  padding: 7px 9px;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.preview-box canvas {
  display: block;
  width: 100%;
  height: auto;
  opacity: 0.94;
  image-rendering: pixelated;
}

.crop-canvas-wrap {
  position: relative;
}

.crop-canvas-wrap canvas + canvas {
  position: absolute;
  inset: 0;
  cursor: crosshair;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.button-grid #saveWorkBtn {
  grid-column: 1 / -1;
}

button,
select,
input {
  border: 1px solid #cbd3dd;
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
}

button {
  height: 40px;
  cursor: pointer;
  transition:
    border-color 140ms ease,
    background 140ms ease,
    color 140ms ease;
}

button:hover {
  border-color: var(--amber);
  background: #eef1f5;
}

#replayBtn {
  border-color: var(--amber);
  background: var(--amber);
  color: #ffffff;
  font-weight: 700;
}

.share-link {
  overflow: hidden;
  border: 1px solid #cbd3dd;
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  padding: 9px;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.field {
  display: grid;
  gap: 8px;
}

.field span,
.range-pair span {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.field input,
.field select {
  height: 40px;
  width: 100%;
  padding: 0 10px;
}

.range-pair {
  display: grid;
  gap: 14px;
}

.processing-panel {
  display: grid;
  gap: 12px;
  border: 1px solid #d8dde5;
  border-radius: 6px;
  background: #ffffff;
  padding: 12px;
}

.panel-title {
  color: var(--amber-soft);
  font-size: 13px;
  font-weight: 700;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 10px;
}

.control-grid label,
.control-grid .control-row {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.control-grid span {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.inline-check {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.inline-check input {
  accent-color: var(--amber);
}

.toggle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.toggle-grid label {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  border: 1px solid #d8dde5;
  border-radius: 6px;
  padding: 0 9px;
  color: var(--text);
  font-size: 12px;
}

.toggle-grid input {
  accent-color: var(--amber);
}

.compact-field {
  gap: 6px;
}

.spec-panel {
  display: grid;
  gap: 5px;
  border: 1px solid #d8dde5;
  border-radius: 6px;
  background: #ffffff;
  padding: 12px;
}

.spec-panel span {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.spec-panel strong {
  color: var(--amber-soft);
  font-size: 15px;
}

.spec-panel small {
  color: var(--muted);
  line-height: 1.35;
}

.spec-range {
  display: grid;
  gap: 7px;
  margin-top: 6px;
}

.spec-range span {
  display: flex;
  justify-content: space-between;
}

.range-pair label {
  display: grid;
  gap: 8px;
}

.range-pair label > span {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

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

.hint {
  margin-top: auto;
  line-height: 1.45;
}

@keyframes flap-snap {
  0% {
    filter: brightness(0.55);
    transform: perspective(360px) rotateX(0deg);
  }
  45% {
    filter: brightness(1.35);
    transform: perspective(360px) rotateX(-88deg);
  }
  55% {
    transform: perspective(360px) rotateX(88deg);
  }
  100% {
    filter: brightness(1);
    transform: perspective(360px) rotateX(0deg);
  }
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding: 10px;
  }

  .stage-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .board-wrap {
    padding: 10px;
  }
}