/* =====================================
   Puzzle Engine — visual system
   ===================================== */

.puzzleScreen {
    --puzzle-ui-surface: #ffffff;
    --puzzle-ui-text: #172033;
    --puzzle-ui-muted: #667085;
    width: min(760px, calc(100% - 32px));
    margin: 0 auto;
    padding: 24px 0 32px;
    color: var(--puzzle-ui-text);
    text-align: center;
}

.puzzleScreen h1 { margin: 0 0 12px; }
.puzzleInstruction { margin: 10px auto 20px; color: var(--puzzle-ui-muted); line-height: 1.8; }

.puzzleItems,
.sequenceItems,
.visualMathEquation,
.visualComparisonArea,
.visualMathCountingGroup {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin: 18px auto;
}

.puzzleItem,
.visualComparisonBtn {
    min-width: 72px;
    min-height: 54px;
    padding: 12px 16px;
    border: 2px solid #dbe4ef;
    border-radius: 15px;
    background: #fff;
    color: var(--puzzle-ui-text);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 5px 14px rgba(15,23,42,.06);
}

.puzzleItem:hover,
.visualComparisonBtn:hover { transform: translateY(-1px); }
.puzzleImageItem { padding: 6px; overflow: hidden; }
.puzzleImageItem img { display: block; max-width: 100px; max-height: 100px; object-fit: contain; border-radius: 10px; }

.puzzleControls,
.sequenceAnswerArea,
.visualMathAnswerArea,
.visualComparisonChoices,
.puzzleStandardControls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px auto;
}

.puzzleControls button,
.sequenceAnswerArea button,
.visualMathAnswerArea button,
.puzzleScreen input,
.puzzleResetBtn {
    min-height: 48px;
    padding: 10px 16px;
    border: 1px solid #d5deea;
    border-radius: 13px;
    background: #fff;
    color: var(--puzzle-ui-text);
    font: inherit;
}

.puzzleControls button,
.sequenceAnswerArea button,
.visualMathAnswerArea button,
.puzzleResetBtn { cursor: pointer; font-weight: 700; }
.puzzleScreen input { min-width: 130px; text-align: center; }

.puzzleMessage { min-height: 32px; margin: 12px auto; font-weight: 800; }
.puzzleMoves { margin-top: 12px; color: var(--puzzle-ui-muted); font-weight: 700; }
.sequenceItem,
.sequenceMissing,
.visualMathQuestion,
.visualMathOperator,
.visualComparisonSeparator { padding: 10px 14px; border-radius: 12px; background: #f4f7fb; font-weight: 800; }
.sequenceMissing,
.visualMathQuestion { min-width: 42px; }
.visualMathGroup { padding: 10px; border-radius: 15px; background: #f8fafc; }
.visualComparisonGroup { min-width: 120px; padding: 14px; border-radius: 15px; background: #f8fafc; }
.ioRow { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; width: min(520px,100%); margin: 10px auto; }
.ioInputValue,
.ioOutputValue,
.ioAnswerInput { padding: 12px; border: 1px solid #dbe4ef; border-radius: 12px; background: #fff; }

@media (max-width: 480px) {
    .puzzleScreen { width: min(100% - 20px, 760px); padding-top: 16px; }
    .puzzleItems { gap: 8px; }
    .puzzleItem { min-width: 60px; }
    .ioRow { grid-template-columns: 1fr auto 1fr; gap: 6px; }
}