.board{
  display:grid;
  grid-template-rows:repeat(6, 1fr);
  gap:10px;
  max-width:280px;
  margin:36px auto 0;
}
.board-row{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:10px;
}
.tile{
  aspect-ratio:1/1;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:'Noto Sans KR',sans-serif;
  font-weight:800;
  font-size:26px;
  color:#fff;
  background:rgba(63,242,255,0.05);
  border:1px solid rgba(63,242,255,0.25);
  border-radius:4px;
  transition:transform .3s ease;
}
.tile.pop{
  animation:pop .15s ease;
}
@keyframes pop{
  0%{transform:scale(1);}
  50%{transform:scale(1.08);}
  100%{transform:scale(1);}
}
.tile.flip{
  animation:flip .5s ease;
}
@keyframes flip{
  0%{transform:rotateX(0);}
  50%{transform:rotateX(90deg);}
  100%{transform:rotateX(0);}
}
.tile.correct{
  background:rgba(77,255,160,0.18);
  border-color:var(--success);
  color:var(--success);
  box-shadow:0 0 14px rgba(77,255,160,0.35);
}
.tile.present{
  background:rgba(255,210,63,0.16);
  border-color:var(--warn);
  color:var(--warn);
  box-shadow:0 0 14px rgba(255,210,63,0.3);
}
.tile.absent{
  background:rgba(255,255,255,0.03);
  border-color:rgba(255,255,255,0.12);
  color:#5c7784;
}

.hint-box{
  margin-top:22px;
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:10px 20px;
  font-family:'Orbitron',sans-serif;
  font-size:13px;
  letter-spacing:.1em;
  color:var(--warn);
  border:1px solid rgba(255,210,63,0.4);
  background:rgba(255,210,63,0.08);
  border-radius:2px;
}
.hint-box .hint-chars{
  font-family:'Noto Sans KR',sans-serif;
  font-size:20px;
  font-weight:800;
  letter-spacing:.4em;
  color:#fff;
}

.guess-form{
  display:flex;
  gap:12px;
  justify-content:center;
  flex-wrap:wrap;
  margin-top:30px;
}
.guess-input{
  width:180px;
  padding:14px 18px;
  background:rgba(63,242,255,0.06);
  border:1px solid rgba(63,242,255,0.35);
  border-radius:2px;
  color:#fff;
  font-family:'Noto Sans KR',sans-serif;
  font-size:18px;
  letter-spacing:.3em;
  text-align:center;
  outline:none;
  transition:border-color .25s, box-shadow .25s;
}
.guess-input:focus{
  border-color:var(--cyan);
  box-shadow:0 0 18px rgba(63,242,255,0.4);
}

.restart-btn{
  display:none;
  margin:30px auto 0;
}
.restart-btn.show{display:inline-flex;}