/*
 * shape-measurer — 2D/3D/Pythagoras measuring widget with a grid canvas,
 * live readouts, and mode-tab switching.
 */

.maths-activity .sm-scenario-chip {
    display: inline-block;
    margin-top: 0.4rem;
    padding: 0.3rem 0.75rem;
    background: var(--maths-surface-alt);
    color: var(--maths-primary-dark);
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.9rem;
}

/* Mode tabs */
.maths-activity .sm-mode-tabs {
    display: flex;
    gap: 0.35rem;
    margin-bottom: 0.9rem;
    border-bottom: 2px solid var(--maths-border);
}

.maths-activity .sm-mode-tab {
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    padding: 0.6rem 1.1rem 0.65rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    color: var(--maths-ink-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 48px;
    margin-bottom: -2px;
}

.maths-activity .sm-mode-tab i {
    font-size: 1rem;
    color: var(--maths-primary);
}

.maths-activity .sm-mode-tab .sm-mode-hint {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--maths-ink-muted);
    text-transform: none;
}

.maths-activity .sm-mode-tab[aria-selected="true"] {
    color: var(--maths-primary);
    border-bottom-color: var(--maths-primary);
    background: var(--maths-surface);
}

.maths-activity .sm-mode-tab:hover:not([aria-selected="true"]) {
    background: var(--maths-surface-alt);
}

.maths-activity .sm-mode-tab:focus-visible {
    outline: 3px solid var(--maths-focus-ring);
    outline-offset: 2px;
}

/* Prompt card */
.maths-activity .sm-prompt {
    background: var(--maths-surface);
    border: 1px solid var(--maths-border);
    border-left: 6px solid var(--maths-accent);
    border-radius: 10px;
    padding: 0.8rem 1.1rem;
    margin-bottom: 0.9rem;
}

.maths-activity .sm-prompt-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--maths-accent-dark);
    margin-bottom: 0.3rem;
}

.maths-activity .sm-prompt-label i {
    margin-right: 0.35rem;
}

.maths-activity .sm-prompt-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--maths-ink);
    line-height: 1.35;
}

/* Shape picker */
.maths-activity .sm-shape-picker {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
}

.maths-activity .sm-shape-btn {
    background: var(--maths-surface);
    border: 2px solid var(--maths-border);
    color: var(--maths-ink);
    border-radius: 8px;
    padding: 0.5rem 0.95rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.maths-activity .sm-shape-btn i {
    color: var(--maths-primary);
}

.maths-activity .sm-shape-btn:hover {
    border-color: var(--maths-primary);
    background: var(--maths-surface-alt);
}

.maths-activity .sm-shape-btn[aria-pressed="true"] {
    background: var(--maths-primary);
    border-color: var(--maths-primary);
    color: #fff;
}

.maths-activity .sm-shape-btn[aria-pressed="true"] i {
    color: #fff;
}

.maths-activity .sm-add-shape {
    margin-left: auto;
    border-style: dashed;
    color: var(--maths-accent);
    border-color: var(--maths-accent);
}

.maths-activity .sm-add-shape i {
    color: var(--maths-accent);
}

.maths-activity .sm-add-shape:hover {
    background: #FFF2EA;
    border-color: var(--maths-accent);
}

/* Workspace: canvas + readout side-by-side */
.maths-activity .sm-workspace {
    display: grid;
    grid-template-columns: minmax(320px, 1fr) minmax(260px, 320px);
    gap: 1rem;
    align-items: start;
}

.maths-activity .sm-canvas-wrap {
    background: var(--maths-surface);
    border: 1px solid var(--maths-border);
    border-radius: 10px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: stretch;
}

.maths-activity .sm-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: 420px;
    touch-action: none;
    border-radius: 6px;
}

.maths-activity .sm-legend {
    font-size: 0.85rem;
    color: var(--maths-ink-muted);
}

.maths-activity .sm-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.maths-activity .sm-swatch {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 2px;
    border: 1px solid var(--maths-grid-line);
}

.maths-activity .sm-swatch-grid {
    background: repeating-linear-gradient(
        90deg,
        var(--maths-surface) 0 3px,
        var(--maths-grid-line) 3px 4px
    ),
    repeating-linear-gradient(
        0deg,
        var(--maths-surface) 0 3px,
        var(--maths-grid-line) 3px 4px
    );
}

/* Readout panel */
.maths-activity .sm-readout {
    background: var(--maths-surface);
    border: 1px solid var(--maths-border);
    border-radius: 10px;
    padding: 1rem 1.1rem;
}

.maths-activity .sm-readout-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--maths-ink-muted);
    margin-bottom: 0.6rem;
}

/* Per-shape list (2D) */
.maths-activity .sm-shapes-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.7rem;
}

.maths-activity .sm-shape-row {
    --shape-colour: var(--maths-primary);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.55rem;
    padding: 0.45rem 0.6rem;
    background: var(--maths-surface-alt);
    border-radius: 6px;
    border-left: 4px solid var(--shape-colour);
}

.maths-activity .sm-shape-swatch {
    width: 14px;
    height: 14px;
    background: var(--shape-colour);
    border-radius: 3px;
}

.maths-activity .sm-shape-name {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--maths-ink);
}

.maths-activity .sm-shape-metrics {
    font-size: 0.85rem;
    color: var(--maths-ink-muted);
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-top: 0.1rem;
}

.maths-activity .sm-shape-metrics strong {
    color: var(--maths-ink);
    font-variant-numeric: tabular-nums;
}

.maths-activity .sm-shape-remove {
    background: transparent;
    border: none;
    color: var(--maths-ink-muted);
    cursor: pointer;
    width: 28px;
    height: 28px;
    border-radius: 4px;
    font-size: 0.9rem;
}

.maths-activity .sm-shape-remove:hover {
    background: #FBEAE7;
    color: var(--maths-danger);
}

/* Totals (2D) */
.maths-activity .sm-totals {
    border-top: 1px solid var(--maths-border);
    padding-top: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.maths-activity .sm-total-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.maths-activity .sm-total-label {
    font-weight: 700;
    color: var(--maths-ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.85rem;
}

.maths-activity .sm-total-value {
    font-weight: 800;
    color: var(--maths-primary);
    font-variant-numeric: tabular-nums;
    font-size: 1.5rem;
}

.maths-activity .sm-total-area .sm-total-value {
    color: var(--maths-accent);
}

/* 3D mode */
.maths-activity .sm-dim-sliders {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.maths-activity .sm-dim-slider {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
    align-items: center;
}

.maths-activity .sm-dim-slider > span:first-child {
    font-weight: 600;
    color: var(--maths-ink);
    font-size: 0.95rem;
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
}

.maths-activity .sm-dim-slider strong {
    color: var(--maths-primary);
    font-variant-numeric: tabular-nums;
}

.maths-activity .sm-dim-slider input[type="range"] {
    grid-column: 1 / -1;
}

.maths-activity .sm-calc-row {
    display: grid;
    grid-template-columns: 1fr auto;
    row-gap: 0.15rem;
    column-gap: 0.5rem;
    align-items: baseline;
    margin-bottom: 0.7rem;
}

.maths-activity .sm-calc-label {
    font-weight: 700;
    color: var(--maths-ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-size: 0.8rem;
}

.maths-activity .sm-calc-value {
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--maths-accent);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

.maths-activity .sm-calc-formula {
    grid-column: 1 / -1;
    font-size: 0.9rem;
    color: var(--maths-ink);
    font-variant-numeric: tabular-nums;
}

.maths-activity .sm-net-wrap {
    margin-top: 1rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--maths-border);
}

.maths-activity .sm-net-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--maths-ink-muted);
    margin-bottom: 0.5rem;
}

.maths-activity .sm-net-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: 220px;
    border-radius: 4px;
    background: var(--maths-surface-alt);
}

.maths-activity .sm-net-hint {
    margin-top: 0.4rem;
    font-size: 0.85rem;
    color: var(--maths-ink-muted);
}

/* Pythagoras mode */
.maths-activity .sm-pyth-equation {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.9rem;
    font-size: 1rem;
    font-weight: 700;
    color: var(--maths-ink);
    margin-bottom: 0.7rem;
}

.maths-activity .sm-pyth-leg {
    color: var(--maths-primary);
    font-variant-numeric: tabular-nums;
}

.maths-activity .sm-pyth-formula {
    color: var(--maths-success);
}

.maths-activity .sm-pyth-working {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--maths-ink);
    padding: 0.6rem 0.8rem;
    background: #E6F2EE;
    border-radius: 6px;
    border-left: 4px solid var(--maths-success);
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.7rem;
}

.maths-activity .sm-pyth-working strong {
    color: var(--maths-success);
    font-size: 1.25rem;
}

.maths-activity .sm-pyth-hint {
    font-size: 0.9rem;
    color: var(--maths-ink-muted);
    line-height: 1.4;
}

@media (max-width: 760px) {
    .maths-activity .sm-workspace {
        grid-template-columns: 1fr;
    }
    .maths-activity .sm-mode-tab .sm-mode-hint {
        display: none;
    }
}

/* Display mode — content-step snapshot. Strip all interactive chrome:
 * mode tabs, shape picker, add/remove buttons, dimension sliders, the
 * prompt card. Keep the canvas and totals/readout visible so the
 * labelled shape tells the story. Interaction handlers are already
 * short-circuited in JS. */
body.display-mode .sm-mode-tabs,
body.display-mode .sm-shape-picker,
body.display-mode .sm-shape-btn,
body.display-mode .sm-add-shape,
body.display-mode [data-remove-shape],
body.display-mode .sm-prompt,
body.display-mode .sm-dim-slider,
body.display-mode input[type="range"] {
    display: none !important;
}

body.display-mode canvas {
    cursor: default;
}