.trace-layout {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  align-items: start;
}
.trace-top {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 16px;
}

.trace-board-card,
.trace-side-card {
  position: relative;
}

.trace-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 4;
  min-height: 460px;
  border-radius: 28px;
  overflow: hidden;
  border: 2px solid rgba(255, 206, 138, 0.38);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.45), transparent 24%),
    radial-gradient(circle at bottom right, rgba(255, 208, 119, 0.3), transparent 20%),
    linear-gradient(180deg, #fff9ec 0%, #fff4dc 100%);
  box-shadow: inset 0 10px 24px rgba(206, 162, 91, 0.12);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.trace-canvas,
.trace-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.trace-canvas {
  z-index: 1;
}

.trace-overlay {
  z-index: 2;
  touch-action: none;
  cursor: crosshair;
}

.trace-side-card {
  display: grid;
  gap: 16px;
  align-content: start;
}

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

.trace-letter-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.trace-number-btn {
  min-height: 74px;
  border: 1px solid rgba(255, 214, 117, 0.24);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(19, 32, 55, 0.96), rgba(11, 20, 37, 0.96));
  color: #fff2c4;
  font-size: 1.9rem;
  font-weight: 900;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.trace-number-btn:hover,
.trace-number-btn:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(255, 214, 117, 0.5);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.26);
}

.trace-number-btn.active {
  background: linear-gradient(180deg, #ffd66d 0%, #ffb85c 100%);
  color: #172742;
  border-color: rgba(255, 230, 170, 0.82);
}

.trace-nav {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 18px;
}

.trace-arrow-btn {
  position: relative;
  width: 88px;
  min-width: 88px;
  min-height: 88px;
  padding: 0;
  border-radius: 999px;
  background: linear-gradient(180deg, #fff4c1 0%, #ffd978 100%);
  border: 4px solid rgba(255, 244, 193, 0.92);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.trace-arrow-btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-top: 16px solid transparent;
  border-bottom: 16px solid transparent;
  transform: translate(-50%, -50%);
}

.trace-arrow-btn-next::before {
  border-left: 24px solid #2f7de1;
  margin-left: 4px;
}

.trace-arrow-btn-prev::before {
  border-right: 24px solid #2f7de1;
  margin-left: -4px;
}

.trace-arrow-btn:hover,
.trace-arrow-btn:focus-visible {
  transform: translateY(-1px) scale(1.02);
}

.trace-arrow-btn:active {
  transform: translateY(1px) scale(0.98);
}

.trace-cheer {
  padding: 16px 18px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255, 221, 121, 0.22), rgba(255, 180, 208, 0.18));
  color: #ffe7a8;
  font-weight: 800;
  border: 1px solid rgba(255, 194, 122, 0.28);
}