body {
  margin: 0;
  background: #f3f3f3;
}

.page {
  max-width: 400px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-item: center;
}

#puzzle {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0 auto 16px;
  width: fit-content;
}

#submit-puzzle {
  display: block;
  margin: 16px auto 24px;
  padding: 8px 14px;
  font-size: 16px;
}

#clues h1 {
  text-align: left;
}

.clues-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(240px, 1fr));
  gap: 32px;
}


#puzzle {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
}

.puzzle-row {
  display: flex;
  gap: 2px;
}

.puzzle-block {
  position: relative;
  width: 56px;
  height: 56px;
  border: 2px solid #000;
  box-sizing: border-box;
  background: white;
}

.puzzle-block--filled {
  background: black;
}

.puzzle-block--active {
  outline: 5px solid #4a90e2;
  outline-offset: -4px;
  z-index: 1;
}

.puzzle-clue-number {
  position: absolute;
  top: 3px;
  left: 4px;
  font-size: 12px;
  line-height: 1;
  font-weight: 700;
  color: #000;
  pointer-events: none;
}

.puzzle-input {
  width: 100%;
  height: 100%;
  border: 0;
  outline: none;
  text-align: center;
  font-size: 36px;
  line-height: 1;
  box-sizing: border-box;
  caret-color: transparent;
  background: transparent;
  padding: 10px 4px 4px;
}

.puzzle-input--wrong {
  background: #fee2e2;
  color: #991b1b;
  box-shadow: inset 0 0 0 2px #f87171;
}

.puzzle-input--correct {
  background: #dcfce7;
  color: #166534;
  box-shadow: inset 0 0 0 2px #4ade80;
}

#submit-puzzle {
  margin: 16px 0 24px;
  padding: 8px 14px;
  font-size: 16px;
}

#clues h1 {
  margin: 0 0 16px;
}

.clues-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(240px, 1fr));
  gap: 32px;
}

.clues-section h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.clue-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.clue-item {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  line-height: 1.35;
}

.clue-number {
  min-width: 28px;
  font-weight: 700;
}

.clue-text {
  flex: 1;
}