.g4-shell .g4-hero h1 { font-size: clamp(34px,4vw,52px); }
.g4-shell .g4-hero-art { background: var(--cream); transform: rotate(-1deg); }
.g4-shell .g4-hero-art svg { max-height: 300px; }
.g4-shell .g4-small { color: var(--muted); font-size: 14px; }
.g4-shell .g4-topic-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
.g4-shell .g4-check-rule { max-width: 85ch; color: var(--muted); margin-bottom: var(--space-5); }
.g4-shell .g4-section-status { color: var(--blue-dark); font-weight: 700; margin: 0 0 var(--space-3); }
.g4-shell .g4-passed { color: var(--green-strong); }
.g4-skill-details { margin-bottom: var(--space-4); font-size: 14px; }
.g4-skill-details summary { min-height: 44px; padding: var(--space-3) 0; }
.g4-skill-details ul { list-style: none; padding: 0; margin: 0; }
.g4-skill-details li { display: flex; gap: var(--space-2); justify-content: space-between; padding: var(--space-2) 0; }
.g4-skill-details strong { white-space: nowrap; }
.g4-shell .g4-filters { grid-template-columns: 1fr 1.5fr; }
.g4-answer-controls { border: 0; min-width: 0; padding: 0; margin: 0; }
.g4-sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.g4-builder > p { color: var(--muted); font-size: 15px; }
.g4-builder [data-g4-board] { position: sticky; top: calc(var(--space-7) * 3); z-index: 2; box-shadow: var(--elevation-soft); }
.g4-builder [data-g4-board] svg { max-height: 220px; }
.g4-builder-controls input, .g4-builder-controls select { scroll-margin-top: calc(var(--space-7) * 8); }
.g4-builder-controls { display: grid; gap: var(--space-4); margin-top: var(--space-4); }
.g4-builder-fields { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: var(--space-3); }
.g4-builder label { display: flex; flex-direction: column; gap: var(--space-2); font-size: 14px; font-weight: 700; }
.g4-builder input[type=text], .g4-builder select { min-width: 0; width: 100%; min-height: 48px; padding: var(--space-2) var(--space-3); border: 1px solid var(--muted); border-radius: var(--radius-sm); background: var(--paper); color: var(--ink); font: inherit; }
.g4-builder input[type=text] { text-transform: uppercase; font-size: 22px; }
.g4-builder input[type=range] { width: 100%; height: 44px; accent-color: var(--blue-dark); }
.g4-builder .g4-crossing-label { max-width: 220px; }
.g4-object-controls, .g4-edge-choices { min-width: 0; border: 1px solid var(--line); border-radius: var(--radius-md); margin: 0; padding: var(--space-4); }
.g4-object-controls legend, .g4-edge-choices legend { font-weight: 700; padding: 0 var(--space-2); }
.g4-object-controls > label { margin-top: var(--space-3); }
.g4-edge-choices { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.g4-edge-choices label { flex-direction: row; align-items: center; min-height: 48px; min-width: 84px; gap: var(--space-2); padding: var(--space-2) var(--space-3); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.g4-edge-choices input { width: 20px; height: 20px; accent-color: var(--blue-dark); }
.g4-shell .g4-line { stroke: var(--blue-dark); stroke-width: 4; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.g4-shell .g4-coral { stroke: var(--coral-strong); }
.g4-shell .g4-dot { fill: var(--blue-dark); }
.g4-shell .g4-dot.g4-coral { fill: var(--coral-strong); }
.g4-shell .g4-angle-fill { fill: var(--yellow); stroke: var(--line); stroke-width: 1; }
.g4-shell .g4-right-mark { fill: none; stroke: var(--green-strong); stroke-width: 3; }
.g4-shell svg text { font-size: 24px; }
.g4-shell .rsm-step-tabs { grid-template-columns: repeat(auto-fit,minmax(150px,1fr)); }
.g4-exchange-buttons { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
.g4-exchange-buttons .rsm-button { font-size: 14px; }
.g4-exchange-buttons [aria-pressed=true] { background: var(--blue-dark); color: var(--paper); }
.g4-place-value { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: var(--space-2); }
.g4-place-table { width: 100%; border-collapse: collapse; text-align: center; table-layout: fixed; }
.g4-place-table caption { font-weight: 700; padding-bottom: var(--space-4); }
.g4-place-table th { font-size: 13px; text-transform: capitalize; background: var(--paper); padding: var(--space-3) var(--space-1); }
.g4-place-table td { padding: var(--space-3) var(--space-1); border: 1px solid var(--line); font-size: 26px; }
.g4-place-table tfoot td { border-top: 3px solid var(--ink); font-weight: 700; color: var(--blue-dark); }
.g4-place-value > div { padding: var(--space-3) var(--space-2); border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); text-align: center; }
.g4-place-value strong { display: block; font-size: 14px; text-transform: capitalize; }
.g4-unit-count { display: block; font: 34px var(--font-display); color: var(--blue-dark); margin: var(--space-3) 0; }
.g4-counters { display: grid; grid-template-columns: repeat(5,8px); justify-content: center; gap: var(--space-1); }
.g4-counters i { width: 8px; height: 8px; border-radius: var(--radius-round); background: var(--blue-dark); }
.g4-trade-note { font-size: 16px; text-align: center; padding: 0 var(--space-2); }
.g4-addition-model { display: grid; gap: var(--space-3); padding: var(--space-3); }
.g4-addition-model strong { display: block; font-size: 16px; margin-bottom: var(--space-2); }
.g4-amount-track { height: 24px; border: 1px solid var(--ink); border-radius: var(--radius-sm); background: var(--yellow); }
.g4-addition-total { border-top: 2px solid var(--ink); padding-top: var(--space-3); }
.g4-addition-total .g4-amount-track { background: var(--paper); }
.g4-result-skills { padding: var(--space-3) var(--space-4); border: 1px solid var(--line); border-radius: var(--radius-md); }
.g4-result-skills p { display: flex; gap: var(--space-3); justify-content: space-between; flex-wrap: wrap; }
.g4-entry { border-color: var(--green-strong); }
@media(max-width:1000px) { .g4-shell .g4-topic-grid { grid-template-columns: repeat(2,minmax(0,1fr)); } }
@media(max-width:650px) {
  .g4-shell .g4-hero-art { transform: none; }
  .g4-shell .g4-topic-grid, .g4-shell .g4-filters { grid-template-columns: 1fr; }
  .g4-shell .g4-topic-grid .rsm-topic-card .rsm-actions { flex-direction: row; }
  .g4-shell .g4-topic-grid .rsm-topic-card .rsm-button { width: auto; }
  .g4-shell .g4-topic-grid .rsm-topic-card { padding: var(--space-5); }
  .g4-builder-fields { grid-template-columns: 1fr 1fr; }
  .g4-builder-fields > label:first-child { grid-column: 1 / -1; }
  .g4-shell .rsm-step-tabs { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .g4-place-value { gap: var(--space-1); }
  .g4-place-value > div { padding: var(--space-3) var(--space-1); }
  .g4-place-value strong { font-size: 11px; }
  .g4-place-table th { font-size: 11px; }
  .g4-counters { grid-template-columns: repeat(5,6px); }
  .g4-counters i { width: 6px; height: 6px; }
  .g4-exchange-buttons .rsm-button { flex: 1 1 45%; }
}

/* One purpose per page. Normal reflow stays available at narrow widths and zoom. */
.page-view[data-page="math-grade4-unit1"] { min-height: 0; }
.g4-shell { max-width: 1120px; padding-top: var(--space-2); padding-bottom: var(--space-4); }
#math-grade4-unit1-app { scroll-margin-top: 128px; }
.g4-shell .rsm-breadcrumb { min-height: 44px; padding: 0; margin-bottom: var(--space-2); gap: var(--space-3); flex-wrap: wrap; }
.g4-shell .rsm-breadcrumb .rsm-button { padding-block: var(--space-2); }
.g4-screen { display: grid; gap: var(--space-3); }
.g4-screen h1 { font-size: 27px; line-height: 1.2; margin: 0; }
.g4-screen h2 { font-size: 24px; margin: 0; }
.g4-screen p { margin: 0; line-height: 1.45; }
.g4-page-heading { display: grid; gap: var(--space-2); }
.g4-page-heading .rsm-eyebrow { font-size: 12px; }
.g4-card { min-width: 0; padding: var(--space-4); border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--paper); box-shadow: var(--elevation-soft); }
.g4-home-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: var(--space-4); }
.g4-home-grid .g4-card { display: grid; align-content: start; gap: var(--space-4); }
.g4-home-options .rsm-button { justify-self: start; }
.g4-select-label { display: grid; gap: var(--space-2); font-size: 14px; font-weight: 700; }
.g4-select-label select { width: 100%; min-height: 46px; padding: var(--space-2); border: 1px solid var(--muted); border-radius: var(--radius-sm); color: var(--ink); background: var(--paper); }
.g4-home-progress { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-4); font-size: 15px; }
.g4-home-progress .rsm-button { margin-left: auto; }
.g4-pager, .g4-toolbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-2); }
.g4-pager > span, .g4-toolbar > span { color: var(--muted); font-size: 14px; }
.g4-pager { margin-top: var(--space-3); }
.g4-screen .rsm-button { min-height: 44px; padding: var(--space-2) var(--space-3); }
.g4-screen .rsm-actions { gap: var(--space-3); }
.g4-screen .g4-filters { margin: 0; gap: var(--space-3); }
.g4-bank-card { margin-top: var(--space-3); display: grid; gap: var(--space-4); }
.g4-bank-card h2 { font: 23px/1.35 var(--font-reading); }
.g4-skill-list { padding: 0; margin: 0; list-style: none; }
.g4-skill-list li { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); min-height: 44px; border-bottom: 1px solid var(--line); }
.g4-progress-card { display: grid; gap: var(--space-3); }
.g4-screen .rsm-session-top { margin: 0; }
.g4-screen > progress { width: 100%; height: 6px; accent-color: var(--blue-dark); }
.g4-screen .rsm-question-card { border-radius: var(--radius-md); padding: var(--space-4); }
.g4-screen .rsm-question-card .g4-page-heading { margin-bottom: var(--space-3); }
.g4-screen .rsm-question-card h1 { font-size: 25px; margin: 0; line-height: 1.25; }
.g4-screen .g4-question-layout.g4-has-visual, .g4-screen .g4-builder, .g4-lesson-grid { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: var(--space-5); }
.g4-screen .g4-question-layout:not(.g4-has-visual) .rsm-choices { grid-template-columns: repeat(2,minmax(0,1fr)); }
.g4-screen .rsm-choices { gap: var(--space-2); }
.g4-screen .rsm-choices legend { padding-bottom: var(--space-2); font-size: 16px; }
.g4-screen .rsm-choices label { min-height: 48px; padding: var(--space-2) var(--space-3); font-size: 17px; }
.g4-screen .rsm-choices input { flex-shrink: 0; }
.g4-screen .rsm-answer-label { margin: 0 0 var(--space-2); }
.g4-screen .rsm-answer { min-height: 50px; }
.g4-screen .rsm-input-help { margin-top: var(--space-2); }
.g4-screen .rsm-feedback { margin: var(--space-2) 0; min-height: 0; font-size: 16px; }
.g4-screen .rsm-feedback:empty { display: none; }
.g4-screen #g4-answer-form > .g4-toolbar { margin-top: var(--space-3); }
.g4-screen .rsm-visual { margin: 0; padding: var(--space-3); }
.g4-screen .rsm-visual svg { max-height: 232px; }
.g4-shell .g4-foundation-svg text { font-size: 29px; }
.g4-shell .g4-foundation-svg .g4-foundation-small { font-size: 26px; }
.g4-foundation-ring { fill: none; stroke: var(--coral-strong); stroke-width: 3; }
.g4-foundation-group { fill: var(--cream); stroke: var(--line); stroke-width: 2; }
.g4-foundation-unit { fill: var(--yellow); stroke: var(--ink); stroke-width: 1; }
.g4-imagined-line { stroke-dasharray: 7 7; }
.g4-screen .g4-builder [data-g4-board] { position: static; box-shadow: none; }
.g4-screen .g4-builder-controls { margin: 0; gap: var(--space-2); }
.g4-screen .g4-builder-controls input, .g4-screen .g4-builder-controls select { scroll-margin-top: 140px; }
.g4-screen .g4-builder-fields { gap: var(--space-2); align-items: end; }
.g4-screen .g4-builder-fields input, .g4-screen .g4-builder-fields select { min-height: 44px; }
.g4-screen .g4-object-controls { border: 0; padding: 0; }
.g4-screen .g4-object-controls legend { padding: 0; margin-bottom: var(--space-2); }
.g4-screen .g4-builder label { gap: var(--space-1); }
.g4-screen .g4-build-step { font-size: 14px; color: var(--muted); margin-bottom: var(--space-2); }
.g4-screen .g4-pair-fields { grid-template-columns: repeat(2,minmax(0,1fr)); }
.g4-screen .g4-edge-choices { gap: var(--space-2); padding: var(--space-2); }
.g4-screen .g4-edge-choices label { min-height: 44px; min-width: 76px; padding: var(--space-2); }
.g4-screen .rsm-lesson-copy { display: grid; gap: var(--space-3); }
.g4-screen .rsm-lesson-copy > p { font-size: 18px; line-height: 1.45; }
.g4-screen .rsm-explorer { padding: var(--space-3); }
.g4-screen .rsm-explorer output { font-size: 20px; }
.g4-screen .g4-exchange-buttons { margin: 0; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
.g4-screen .g4-exchange-buttons .rsm-button { font-size: 14px; }
.g4-screen .g4-place-table td { font-size: 24px; padding: var(--space-1); }
.g4-screen .g4-place-table th { padding: var(--space-2) var(--space-1); }
.g4-screen .g4-place-table caption { padding-bottom: var(--space-2); }
.g4-screen .g4-trade-note { font-size: 15px; margin-top: var(--space-2); }
.g4-screen .g4-addition-model { padding: var(--space-2); gap: var(--space-2); }
.g4-screen .g4-addition-model strong { margin-bottom: var(--space-1); }
.g4-screen .g4-amount-track { height: 18px; }
.g4-screen .rsm-check-options { display: grid; gap: var(--space-2); }
.g4-screen .rsm-check-options .rsm-button { min-height: 48px; text-align: left; border: 1px solid var(--line); background: var(--paper); }
.g4-screen .rsm-check-options [aria-pressed=true] { border-color: var(--blue-dark); background: var(--cream); }
.g4-check-card { display: grid; gap: var(--space-3); }
.g4-chosen-answer { font-weight: 700; color: var(--green-strong); }
.g4-summary-overview, .g4-answer-detail { display: grid; gap: var(--space-4); }
.g4-screen .rsm-score { margin: 0; padding: var(--space-4); }
.g4-screen .rsm-score strong { font: 48px var(--font-display); color: var(--blue-dark); }
.g4-screen .rsm-score strong span { font-size: 28px; }
.g4-screen > .rsm-button { justify-self: start; }
@media(max-width:700px) {
  .g4-shell .rsm-breadcrumb .rsm-button { width: auto; padding-inline: var(--space-2); font-size: 14px; }
  .g4-screen h1 { font-size: 25px; }
  .g4-screen .rsm-question-card h1 { font-size: 22px; }
  .g4-home-grid, .g4-screen .g4-question-layout.g4-has-visual, .g4-screen .g4-builder, .g4-lesson-grid { grid-template-columns: 1fr; gap: var(--space-3); }
  .g4-home-grid .g4-card { gap: var(--space-3); }
  .g4-home-options h2, .g4-home-options > p:not(.g4-small) { display: none; }
  .g4-home-options { grid-template-columns: 1fr 1fr; }
  .g4-home-options .g4-small { grid-column: 1 / -1; }
  .g4-home-options .rsm-button { justify-self: stretch; }
  .g4-screen .rsm-visual { padding: var(--space-2); }
  .g4-screen .rsm-visual svg { max-height: 160px; }
  .g4-screen .rsm-lesson-copy > p { font-size: 18px; }
  .g4-screen .g4-pair-fields > label:first-child { grid-column: auto; }
  .g4-screen .g4-builder-fields { grid-template-columns: 1fr 1fr; }
  .g4-screen .g4-question-layout:not(.g4-has-visual) .rsm-choices { grid-template-columns: 1fr; }
  .g4-home-progress { gap: var(--space-2); }
  .g4-home-progress .rsm-button { margin-left: 0; }
  .g4-screen .g4-toolbar { justify-content: space-between; }
  .g4-screen .g4-toolbar > .rsm-link { flex-basis: 100%; }
  .g4-screen nav.g4-toolbar { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
  .g4-screen nav.g4-toolbar > span { grid-column: 1 / -1; grid-row: 1; text-align: center; }
  .g4-screen nav.g4-toolbar .rsm-button { font-size: 16px; }
  .g4-screen .g4-pager .rsm-button { padding-inline: var(--space-3); }
  .g4-screen .g4-place-value strong { font-size: 11px; }
}