/*
 * drag-sort — sort cards into labelled buckets. Pointer-event drag
 * (works on touch + mouse). Card → bucket → if it matches the
 * bucket's accept rule it sticks; otherwise it bounces back. Use
 * cases: numbers by parity / multiple-of / prime; shapes by sides
 * / symmetry; fractions by size; times in order.
 */

.maths-activity [hidden] { display: none !important; }

.maths-activity .ds-stage {
    background: #fffaf0;
    border: 1px solid var(--maths-border, #e0e7ef);
    border-radius: 14px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(20, 40, 80, 0.05);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.maths-activity .ds-section-label {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--maths-text-muted, #6b7280);
    margin-bottom: 0.4rem;
}

.maths-activity .ds-source {
    background: #fff;
    border: 1px solid var(--maths-border, #e0e7ef);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    box-shadow: 0 2px 8px rgba(20, 40, 80, 0.04);
}

.maths-activity .ds-source-tray {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    min-height: 64px;
    align-items: center;
}

.maths-activity .ds-buckets {
    display: grid;
    gap: 0.75rem;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.maths-activity .ds-bucket {
    background: #fff;
    border: 2px dashed #cfd8dc;
    border-radius: 12px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 140px;
    transition: background-color 120ms ease-out, border-color 120ms ease-out;
}

.maths-activity .ds-bucket.ds-bucket-active {
    background: #fff8e1;
    border-color: #f0c14b;
    border-style: solid;
}

.maths-activity .ds-bucket-label {
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    color: var(--maths-primary-dark, #1b5e20);
    text-align: center;
    font-size: 0.95rem;
}

.maths-activity .ds-bucket-tray {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    min-height: 56px;
    align-content: flex-start;
    flex: 1;
}

/* Cards */
.maths-activity .ds-card {
    background: #fff;
    border: 2px solid #455a64;
    border-radius: 10px;
    padding: 0.5rem 0.875rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--maths-ink, #1F2933);
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    font-variant-numeric: tabular-nums;
    min-width: 56px;
    text-align: center;
    transition: transform 120ms ease-out, box-shadow 120ms ease-out;
}

.maths-activity .ds-card:hover { box-shadow: 0 2px 6px rgba(20, 40, 80, 0.12); }
.maths-activity .ds-card:active { cursor: grabbing; }

.maths-activity .ds-card.ds-dragging {
    opacity: 0.85;
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.18);
    z-index: 1000;
    position: fixed;
    pointer-events: none;
}

.maths-activity .ds-card.ds-correct {
    border-color: #2E7D32;
    background: #e8f5e9;
}

.maths-activity .ds-card.ds-wrong {
    border-color: #c62828;
    background: #ffebee;
}

/* Status + check */
.maths-activity .ds-status-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
}

.maths-activity .ds-score {
    background: #fff;
    border: 1px solid var(--maths-border, #e0e7ef);
    border-radius: 12px;
    padding: 0.5rem 0.875rem;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    font-family: 'Nunito', sans-serif;
}

.maths-activity .ds-score-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--maths-text-muted, #6b7280);
}

.maths-activity .ds-score-value {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--maths-primary-dark, #1b5e20);
    font-variant-numeric: tabular-nums;
}

.maths-activity .ds-mode-chip {
    display: inline-block;
    background: var(--maths-primary, #2E7D32);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.625rem;
    border-radius: 999px;
    margin-top: 0.25rem;
}


.maths-activity .ds-your-turn {
    margin-top: 1.25rem;
    background: #f1f8e9;
    border: 1px solid #aed581;
    border-radius: 14px;
    padding: 1rem 1.25rem;
}

.maths-activity .ds-your-turn-label {
    font-weight: 800;
    color: #33691e;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.maths-activity .ds-your-turn-list { margin: 0; padding-left: 1.25rem; color: #1f2937; font-weight: 600; }
.maths-activity .ds-your-turn-list li { margin-bottom: 0.25rem; }

/* Display mode — pin the buckets, hide controls */
body.display-mode .activity-header .controls-container,
body.display-mode .ds-status-row,
body.display-mode .ds-your-turn { display: none !important; }
body.display-mode .ds-card { cursor: default !important; pointer-events: none; }