/*
 * number-line-jumps activity styles.
 *
 * The number line and jump arcs are rendered as an SVG so we get
 * crisp scaling on any IWB or tablet. Forward jumps draw an arc
 * above the line in primary blue; back-jumps draw an arc below in
 * accent orange. Each arc carries its size label at the apex.
 */

.nlj-mode-chip {
    display: inline-block;
    padding: 0.3rem 0.7rem;
    background: var(--maths-surface-alt);
    color: var(--maths-primary-dark);
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.nlj-target-label {
    font-weight: 800;
    color: #8a5a00;
    font-size: 0.95rem;
    margin-right: 0.5rem;
}

.nlj-target-prompt {
    flex: 1 1 auto;
    color: #6b4500;
    font-weight: 700;
    font-size: 1rem;
}

.nlj-controls {
    background: var(--maths-surface);
    border: 1px solid var(--maths-border);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    margin-bottom: 1rem;
}

.nlj-control-row {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-wrap: wrap;
    margin-bottom: 0.65rem;
}

.nlj-control-label {
    font-weight: 700;
    color: var(--maths-ink);
}

.nlj-stepper {
    display: inline-flex;
    align-items: stretch;
    border: 2px solid var(--maths-border);
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
}

.nlj-step-btn {
    min-width: 48px;
    min-height: 44px;
    border: 0;
    background: var(--maths-surface-alt);
    color: var(--maths-primary-dark);
    font-weight: 800;
    font-size: 1.05rem;
    cursor: pointer;
    padding: 0 0.45rem;
    border-right: 1px solid var(--maths-border);
}

.nlj-step-btn:last-of-type { border-right: 0; }
.nlj-step-btn:hover { background: var(--maths-surface); }
.nlj-step-btn:active { background: var(--maths-primary); color: #fff; }

.nlj-step-value {
    min-width: 3.6rem;
    min-height: 44px;
    border: 0;
    border-right: 1px solid var(--maths-border);
    background: #fff;
    color: var(--maths-primary-dark);
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 1.4rem;
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    padding: 0 0.6rem;
}

.nlj-step-value:hover { background: var(--maths-surface-alt); }

.nlj-equation {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--maths-primary-dark);
    padding: 0.25rem 0.8rem;
    background: var(--maths-surface-alt);
    border-radius: 8px;
    font-variant-numeric: tabular-nums;
}

.nlj-strategy-hint {
    color: var(--maths-accent-dark);
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.25rem 0.65rem;
    background: #FFF7DE;
    border-radius: 8px;
}

.nlj-strategy-hint[hidden] { display: none; }

.nlj-jump-buttons {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.nlj-jump-group {
    flex: 1 1 280px;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
    border: 1px solid var(--maths-border);
    background: #FAFCFE;
    padding: 0.5rem 0.65rem;
    border-radius: 10px;
}

.nlj-jump-group-label {
    font-weight: 800;
    color: var(--maths-primary-dark);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: 0.4rem;
}

.nlj-jump-btn {
    background: var(--maths-primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.55rem 0.9rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 1.05rem;
    cursor: pointer;
    min-width: 56px;
    min-height: 44px;
    font-variant-numeric: tabular-nums;
    transition: background-color 160ms ease, transform 80ms ease;
}

.nlj-jump-btn:hover { background: var(--maths-primary-dark); }
.nlj-jump-btn:active { transform: translateY(1px); }
.nlj-jump-btn:disabled { background: #b5bcc8; cursor: not-allowed; }

.nlj-jump-btn-back {
    background: var(--maths-accent);
}

.nlj-jump-btn-back:hover { background: var(--maths-accent-dark); }

.nlj-stage {
    background: var(--maths-surface);
    border: 1px solid var(--maths-border);
    border-radius: 12px;
    padding: 0.5rem 0.7rem;
    margin-bottom: 1rem;
}

.nlj-line-svg {
    width: 100%;
    height: auto;
    display: block;
    max-height: 280px;
}

.nlj-line { stroke: var(--maths-ink); stroke-width: 2; }
.nlj-tick { stroke: var(--maths-ink-muted); stroke-width: 1.5; }
.nlj-tick-major { stroke: var(--maths-ink); stroke-width: 2; }
.nlj-tick-label { fill: var(--maths-ink); font-family: 'Nunito', sans-serif; font-weight: 700; font-size: 18px; }

.nlj-jump-arc-forward { fill: none; stroke: var(--maths-primary); stroke-width: 2.5; }
.nlj-jump-arc-back { fill: none; stroke: var(--maths-accent); stroke-width: 2.5; stroke-dasharray: 5 4; }

.nlj-jump-label {
    fill: #fff;
    stroke: none;
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 17px;
    text-anchor: middle;
}

.nlj-jump-pill-forward { fill: var(--maths-primary); }
.nlj-jump-pill-back { fill: var(--maths-accent); }

.nlj-marker { fill: var(--maths-primary); }
.nlj-marker-end { fill: var(--maths-success); }
.nlj-marker-label {
    fill: var(--maths-ink);
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 19px;
    text-anchor: middle;
}

.nlj-summary {
    background: var(--maths-surface);
    border: 1px solid var(--maths-border);
    border-radius: 12px;
    padding: 0.7rem 1rem;
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.nlj-summary-row {
    display: flex;
    gap: 0.5rem;
    align-items: baseline;
}

.nlj-summary-label {
    font-weight: 700;
    color: var(--maths-ink-muted);
    text-transform: uppercase;
    font-size: 1rem;
    letter-spacing: 0.05em;
}

.nlj-summary-value {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    color: var(--maths-ink);
    font-size: 1.1rem;
}

.nlj-summary-total {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--maths-primary-dark);
}

.nlj-your-turn {
    background: #FFF7DE;
    border: 1px solid #F0C14B;
    border-radius: 12px;
    padding: 0.9rem 1.1rem;
    margin-top: 1rem;
}

.nlj-your-turn-label { font-weight: 800; color: #8a5a00; margin-bottom: 0.4rem; }
.nlj-your-turn-list { margin: 0; padding-left: 1.2rem; color: #5e3c00; font-weight: 600; }

/* Display mode strips the jump-button bank entirely — the line already
 * shows the strategy as labelled arcs, the button bank is just clutter
 * for a teacher-led snapshot. The start-value stepper becomes bare text. */
body.display-mode .nlj-jump-buttons {
    display: none;
}

body.display-mode .nlj-step-btn { display: none; }
body.display-mode .nlj-step-value {
    background: transparent;
    border: 0;
    color: var(--maths-primary-dark);
    cursor: default;
    pointer-events: none;
}
body.display-mode .nlj-stepper {
    border: 2px solid transparent;
    background: transparent;
}

body.display-mode .nlj-controls {
    padding-bottom: 0.85rem;
}

/* Numeric keypad popover (same pattern as area-model / equal-groups) */
.nlj-keypad {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    background: #fff;
    border: 2px solid var(--maths-primary);
    border-radius: 14px;
    box-shadow: 0 10px 32px rgba(15, 23, 42, 0.18);
    padding: 0.8rem;
    width: min(360px, 92vw);
}

.nlj-keypad[hidden] { display: none; }

.nlj-keypad-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.nlj-keypad-prompt {
    font-weight: 800;
    color: var(--maths-primary-dark);
}

.nlj-keypad-close {
    border: 0;
    background: transparent;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--maths-ink-muted);
}

.nlj-keypad-display {
    text-align: center;
    background: var(--maths-surface-alt);
    border-radius: 10px;
    padding: 0.6rem;
    font-size: 2rem;
    font-weight: 800;
    color: var(--maths-primary-dark);
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.6rem;
}

.nlj-keypad-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.4rem;
}

.nlj-key {
    min-height: 54px;
    border: 2px solid var(--maths-border);
    border-radius: 10px;
    background: #fff;
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--maths-primary-dark);
    cursor: pointer;
}

.nlj-key:hover { background: var(--maths-surface-alt); }
.nlj-key:active { background: var(--maths-primary); color: #fff; }
.nlj-key-back { color: var(--maths-danger); border-color: var(--maths-danger); }
.nlj-key-ok {
    color: #fff;
    background: var(--maths-primary);
    border-color: var(--maths-primary-dark);
}

/* "Type your own jump" buttons — dashed outline so they read as free entry,
   not another fixed size. Placed after the .nlj-jump-btn rules so the
   transparent fill wins on equal specificity. */
.nlj-jump-custom {
    background: transparent;
    color: var(--maths-primary);
    border: 2px dashed var(--maths-primary);
}
.nlj-jump-custom:hover { background: var(--maths-surface-alt); }
.nlj-jump-btn-back.nlj-jump-custom {
    color: var(--maths-accent);
    border-color: var(--maths-accent);
}