* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  min-height: 100%;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
  background: #f5f5f5;
  color: #111;
}
body {
  overflow-x: hidden;
}
button {
  font: inherit;
}
.app {
  min-height: 100vh;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.header {
  width: min(1200px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.header h1 {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.15;
}
.header p {
  margin: 7px 0 0;
  color: #666;
  font-size: 14px;
}
.center-badge {
  min-width: 82px;
  padding: 9px 13px;
  border: 1px solid #ddd;
  border-radius: 14px;
  background: #fff;
  text-align: center;
}
.center-badge span {
  display: block;
  color: #666;
  font-size: 11px;
}
.center-badge strong {
  display: block;
  font-size: 28px;
  line-height: 1.1;
  margin-top: 2px;
}
.stage {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.world {
  --face: min(23vw, 27vh, 300px);
  display: grid;
  grid-template-columns: repeat(3, var(--face));
  grid-template-rows: repeat(3, var(--face));
  grid-template-areas: ". top ." "left center right" ". bottom .";
  gap: clamp(5px, 0.7vw, 10px);
  user-select: none;
}
.face {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: clamp(3px, 0.35vw, 5px);
  padding: clamp(3px, 0.35vw, 5px);
  border: 0;
  background: #101010;
  border-radius: 5px;
  min-width: 0;
  min-height: 0;
  cursor: pointer;
  touch-action: manipulation;
}
.face:focus-visible {
  outline: 3px solid #111;
  outline-offset: 3px;
}
.face-top {
  grid-area: top;
  transform: perspective(150px) rotateX(-45deg) scaleY(0.35);
  transform-origin: center bottom;
}

.face-bottom {
  grid-area: bottom;
  transform: perspective(150px) rotateX(45deg) scaleY(0.35);
  transform-origin: center top;
}

.face-left {
  grid-area: left;
  transform: perspective(150px) rotateY(45deg) scaleX(0.35);
  transform-origin: right center;
}

.face-right {
  grid-area: right;
  transform: perspective(150px) rotateY(-45deg) scaleX(0.35);
  transform-origin: left center;
}

.face-center {
  grid-area: center;
  box-shadow: 0 0 0 2px #101010;
  position: relative;
  z-index: 2;
}
.sticker {
  min-width: 0;
  min-height: 0;
  border-radius: 2px;
  border: 1px solid #0002;
  pointer-events: none;
}
.control-panel {
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: 13px 15px;
  border: 1px solid #ddd;
  border-radius: 15px;
  background: #fff;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}
.gacon-group {
  display: flex;
  align-items: center;
  gap: 13px;
}
.gacon-key {
  width: 82px;
  min-height: 58px;
  border: 1px solid #bbb;
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.gacon-key:active {
  transform: translateY(1px);
}
.gacon-key kbd {
  font-size: 18px;
  font-weight: 800;
  border: 0;
  padding: 0;
  background: transparent;
}
.gacon-key span {
  color: #666;
  font-size: 10px;
}
.gacon-description {
  text-align: center;
}
.gacon-description strong {
  display: block;
}
.gacon-description small {
  display: block;
  margin-top: 2px;
  color: #666;
  font-size: 11px;
}
.help {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  color: #666;
  font-size: 12px;
}
.help span {
  display: flex;
  align-items: center;
  gap: 4px;
}
kbd {
  min-width: 27px;
  padding: 4px 7px;
  border: 1px solid #bbb;
  border-bottom-width: 2px;
  border-radius: 6px;
  background: #fafafa;
  color: #111;
  text-align: center;
  font-size: 12px;
  font-weight: 700;
}

@media (max-width: 700px) {
  .app {
    padding: 14px;
  }
  .header {
    align-items: flex-start;
  }
  .header p {
    font-size: 12px;
  }
  .world {
    --face: min(27vw, 20vh, 170px);
  }
  .control-panel {
    align-items: stretch;
  }
  .gacon-group {
    width: 100%;
    justify-content: space-between;
  }
  .help {
    width: 100%;
    justify-content: center;
  }
}
@media (max-width: 430px) {
  .world {
    --face: min(28vw, 30vh, 360px);
    gap: 4px;
  }
  .header h1 {
    font-size: 21px;
  }
  .center-badge {
    min-width: 62px;
    padding: 7px 9px;
  }
  .center-badge strong {
    font-size: 22px;
  }
  .gacon-key {
    width: 72px;
  }
}