@font-face {
  font-family: "Handlee Local";
  src: url("/assets/fonts/handlee/Handlee-Regular.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

body.free-fall-whiteboard-preview {
  --wb-ink: #11191d;
  --wb-blue: #064fd1;
  --wb-red: #e0201e;
  --wb-green: #087a3c;
  --wb-yellow: #f2b900;
  --wb-hand: "Handlee Local", "Segoe Print", cursive;
  min-height: 100vh;
  background: #fbfcf8;
  color: #112f43;
}

body.free-fall-whiteboard-preview > .site-header,
body.free-fall-whiteboard-preview > .site-footer {
  display: none;
}

body.free-fall-whiteboard-preview main {
  overflow: visible;
}

.wb-lesson {
  width: 100%;
  max-width: none;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  background:
    linear-gradient(96deg, #636d70 0%, #e5e9e8 9%, #7f898b 24%, #f2f4f3 49%, #788184 73%, #dfe4e3 91%, #626b6d 100%);
}

.wb-top-menu {
  position: sticky;
  z-index: 40;
  top: 0;
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  min-height: 78px;
  padding-bottom: 11px;
  background:
    radial-gradient(ellipse at 20% 12%, rgba(39, 89, 74, 0.035), transparent 35%),
    repeating-linear-gradient(1deg, rgba(39, 74, 65, 0.012) 0 1px, transparent 1px 16px),
    #fbfcf8;
  box-shadow: 0 0.25rem 0.8rem rgba(18, 39, 43, 0.13);
  font-family: var(--wb-hand);
}

.wb-top-menu::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 11px;
  background:
    linear-gradient(96deg, #667073 0%, #e8eceb 8%, #7f898b 21%, #f4f6f5 46%, #788184 72%, #dfe4e3 91%, #626b6d 100%);
  content: "";
}

.wb-top-menu__brand {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  border-right: 11px solid #7e888a;
  color: var(--wb-green);
  font-size: 1.55rem;
  line-height: 1;
  text-decoration: none;
}

.wb-top-menu__brand::after {
  display: block;
  width: 2.8rem;
  height: 2px;
  margin: 1.35rem 0 0 -2.8rem;
  background: currentColor;
  content: "";
  transform: rotate(-1deg);
}

.wb-top-menu nav {
  display: flex;
  gap: clamp(1.1rem, 3vw, 3.4rem);
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.5rem;
}

.wb-top-menu nav a {
  position: relative;
  color: #294950;
  font-family: var(--wb-hand);
  font-size: clamp(1.05rem, 1.35vw, 1.38rem);
  line-height: 1;
  text-decoration: none;
}

.wb-top-menu nav a:hover,
.wb-top-menu nav a:focus-visible,
.wb-top-menu nav a.is-active {
  color: var(--wb-blue);
}

.wb-top-menu nav a.is-active::after {
  position: absolute;
  right: -0.2rem;
  bottom: -0.38rem;
  left: -0.2rem;
  height: 2px;
  border-radius: 50%;
  background: var(--wb-blue);
  content: "";
  transform: rotate(-1deg);
}

.wb-top-menu :focus-visible {
  outline: 4px solid var(--wb-yellow);
  outline-offset: 4px;
}

.wb-layout {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  gap: 0;
  align-items: start;
}

.wb-rail {
  position: sticky;
  z-index: 10;
  top: 78px;
  max-height: calc(100vh - 78px);
  overflow: auto;
  border: 0;
  border-right: 11px solid #7e888a;
  border-radius: 0;
  background:
    radial-gradient(ellipse at 20% 12%, rgba(39, 89, 74, 0.035), transparent 35%),
    repeating-linear-gradient(1deg, rgba(39, 74, 65, 0.012) 0 1px, transparent 1px 16px),
    #fbfcf8;
  box-shadow:
    inset -1.1rem 0 1.7rem -1.5rem rgba(25, 47, 46, 0.7),
    0.45rem 0 0 rgba(236, 240, 239, 0.75);
  font-family: var(--wb-hand);
}

.wb-rail__heading {
  padding: 1.25rem 1rem 0.7rem;
  border-bottom: 2px solid rgba(8, 122, 60, 0.65);
}

.wb-rail__heading > p {
  width: fit-content;
  margin: 0 0 0.5rem;
  color: var(--wb-green);
  font-size: 1.55rem;
  letter-spacing: 0.12em;
  line-height: 1;
  transform: rotate(-1deg);
}

.wb-rail__heading > p::after {
  display: block;
  width: 112%;
  height: 3px;
  margin-top: 0.12rem;
  border-radius: 50%;
  background: currentColor;
  content: "";
  transform: rotate(-1.5deg);
}

.wb-rail__unit {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  min-height: auto;
  padding: 0;
  border-bottom: 0;
  color: #075d34;
  font-family: var(--wb-hand);
  font-size: 1.2rem;
  line-height: 1.05;
  text-decoration: none;
}

.wb-rail__unit:hover {
  color: #053e24;
}

.wb-rail__sequence {
  display: grid;
  gap: 0.55rem;
  padding: 0.9rem 0.85rem;
  border-bottom: 2px solid rgba(6, 79, 209, 0.32);
}

.wb-rail__sequence > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  min-height: 2.65rem;
  padding: 0.45rem 0.2rem;
  border-bottom: 2px solid rgba(6, 79, 209, 0.55);
  border-radius: 0;
  background: transparent;
  color: var(--wb-blue);
  font-size: 0.9rem;
  font-weight: 400;
  line-height: 1.15;
  text-decoration: none;
  transform: rotate(-0.35deg);
}

.wb-rail__sequence > a:hover {
  color: #03348b;
  border-bottom-color: var(--wb-red);
}

.wb-rail__sequence small {
  display: block;
  margin-bottom: 0.12rem;
  color: var(--wb-red);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.wb-rail nav {
  padding: 1rem 0.85rem;
}

.wb-rail nav h2 {
  width: fit-content;
  margin: 0 0 0.65rem;
  color: var(--wb-blue);
  font-family: var(--wb-hand);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  text-transform: none;
  transform: rotate(-1deg);
}

.wb-rail nav h2::after {
  display: block;
  width: 108%;
  height: 2px;
  margin-top: 0.06rem;
  background: currentColor;
  content: "";
  transform: rotate(1deg);
}

.wb-rail nav ol {
  display: grid;
  gap: 0.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.wb-rail nav a {
  display: grid;
  grid-template-columns: 1.55rem 1fr;
  gap: 0.35rem;
  align-items: center;
  padding: 0.39rem 0.35rem;
  border-radius: 0.18rem;
  color: #28454c;
  font-size: 0.88rem;
  font-weight: 400;
  text-decoration: none;
}

.wb-rail nav a span {
  color: var(--wb-red);
  font-family: var(--wb-hand);
  font-size: 0.82rem;
}

.wb-rail nav a:hover,
.wb-rail nav a[aria-current="true"] {
  background: rgba(8, 122, 60, 0.1);
  color: #075b48;
}

.wb-rail nav a[aria-current="true"] {
  outline: 2px solid rgba(8, 122, 60, 0.58);
  outline-offset: -2px;
  transform: rotate(-0.5deg);
}

.wb-rail__course {
  padding: 0.85rem;
  border-top: 2px solid rgba(224, 32, 30, 0.42);
}

.wb-rail__course .ffx-early-course-cta {
  padding: 0.8rem;
  border: 2px solid var(--wb-blue);
  border-radius: 48% 52% 49% 51% / 4% 3% 5% 4%;
  background: transparent;
  color: #173e4b;
  box-shadow: none;
  transform: rotate(0.35deg);
}

.wb-rail__course .ffx-early-course-cta__eyebrow {
  margin: 0 0 0.3rem;
  color: var(--wb-red);
  font-size: 0.7rem;
}

.wb-rail__course .ffx-early-course-cta h2 {
  margin: 0;
  color: var(--wb-blue);
  font-size: 1.02rem;
}

.wb-rail__course .ffx-early-course-cta p {
  margin: 0.35rem 0;
  color: #294950;
  font-size: 0.82rem;
}

.wb-rail__course .ffx-early-course-cta a {
  color: var(--wb-blue);
  font-size: 0.84rem;
}

.wb-deck {
  display: grid;
  gap: 0;
  min-width: 0;
  background: #8d9698;
}

.wb-frame {
  position: relative;
  min-width: 0;
  padding: 12px;
  scroll-margin-top: 5.6rem;
  border: 1px solid #565e61;
  border-radius: 0;
  background:
    linear-gradient(96deg, #6b7376 0%, #e9eded 7%, #878f92 18%, #f3f5f5 38%, #737b7e 57%, #e0e4e5 77%, #656d70 100%),
    #92989a;
  box-shadow:
    0 0.6rem 1.4rem rgba(18, 39, 43, 0.2),
    0 0.2rem 0.4rem rgba(18, 39, 43, 0.18);
}

.wb-frame::before,
.wb-frame::after {
  position: absolute;
  z-index: 3;
  left: 12px;
  right: 12px;
  height: 1px;
  background: rgba(255, 255, 255, 0.72);
  content: "";
  pointer-events: none;
}

.wb-frame::before {
  top: 5px;
}

.wb-frame::after {
  bottom: 5px;
}

.wb-corner {
  position: absolute;
  z-index: 6;
  width: 23px;
  height: 23px;
  border: 1px solid #202628;
  background: linear-gradient(135deg, #424a4d, #171c1e 72%);
  pointer-events: none;
}

.wb-corner--tl {
  top: -1px;
  left: -1px;
  border-radius: 0.22rem 0 0;
}

.wb-corner--tr {
  top: -1px;
  right: -1px;
  border-radius: 0 0.22rem 0 0;
  transform: rotate(90deg);
}

.wb-corner--bl {
  bottom: -1px;
  left: -1px;
  border-radius: 0 0 0 0.22rem;
  transform: rotate(-90deg);
}

.wb-corner--br {
  right: -1px;
  bottom: -1px;
  border-radius: 0 0 0.22rem;
  transform: rotate(180deg);
}

.wb-board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(220px, auto));
  gap: 1.45rem 1.9rem;
  min-height: 760px;
  overflow: hidden;
  padding: 2.25rem 2.35rem 2rem;
  background:
    radial-gradient(ellipse at 16% 11%, rgba(72, 104, 96, 0.035), transparent 28%),
    radial-gradient(ellipse at 83% 45%, rgba(30, 75, 114, 0.025), transparent 30%),
    repeating-linear-gradient(2deg, rgba(51, 84, 78, 0.01) 0 1px, transparent 1px 15px),
    #fcfdfa;
  box-shadow:
    inset 0 0 2.8rem rgba(45, 67, 62, 0.11),
    inset 0 0 0 1px rgba(46, 63, 61, 0.22);
  color: var(--wb-ink);
  font-family: var(--wb-hand);
  line-height: 1.32;
}

.wb-board::after {
  position: absolute;
  inset: 0;
  z-index: 20;
  background:
    linear-gradient(96deg, transparent 0 48%, rgba(62, 91, 84, 0.018) 50%, transparent 52%),
    linear-gradient(3deg, transparent 0 63%, rgba(45, 79, 73, 0.012) 65%, transparent 67%);
  content: "";
  pointer-events: none;
}

.wb-scene-content,
.wb-board-title,
.wb-scene-marker {
  position: relative;
  z-index: 2;
}

.wb-scene-marker {
  position: absolute;
  z-index: 2;
  top: 1rem;
  right: 2.7rem;
  width: fit-content;
  margin: 0;
  color: var(--wb-red);
  font-size: 1.18rem;
  letter-spacing: 0.04em;
  transform: rotate(-1deg);
}

.wb-scene-marker::after {
  display: block;
  width: 112%;
  height: 2px;
  margin-top: 0.08rem;
  border-radius: 50%;
  background: currentColor;
  content: "";
}

.wb-scene-content {
  display: contents;
}

.wb-item {
  position: relative;
  z-index: 2;
  min-width: 0;
}

.wb-board-title {
  grid-column: 1 / 3;
  grid-row: 1;
  align-self: start;
  padding: 0.35rem 0 0 0.35rem;
}

.wb-board-title p {
  margin: 0 0 0.15rem;
  color: var(--wb-green);
  font-size: 1.3rem;
  letter-spacing: 0.14em;
}

.wb-board-title h1 {
  width: fit-content;
  margin: 0;
  color: var(--wb-blue);
  font-family: var(--wb-hand);
  font-size: clamp(3.1rem, 5vw, 5rem);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 0.9;
  transform: rotate(-1deg);
}

.wb-board-title h1::after {
  display: block;
  width: 105%;
  height: 0.18rem;
  margin-top: 0.22rem;
  border-radius: 50%;
  background: var(--wb-blue);
  content: "";
}

.wb-board-title > span {
  display: block;
  margin: 0.45rem 0 0 1.2rem;
  color: var(--wb-red);
  font-size: 1.25rem;
  transform: rotate(-1deg);
}

.wb-board--model .wb-item--definition-gravity-alone {
  grid-column: 1 / 3;
  grid-row: 2;
}

.wb-board--model .wb-item--model-check {
  grid-column: 3;
  grid-row: 1 / 3;
  align-self: center;
  transform: rotate(0.55deg);
}

.wb-board--mass .wb-item--different-masses-same-drop {
  grid-column: 1 / -1;
  grid-row: 1 / 3;
  align-self: center;
}

.wb-board--air .wb-item--hammer-feather-air-resistance {
  grid-column: 1 / 3;
  grid-row: 1;
}

.wb-board--air .wb-item--mass-independence-summary {
  grid-column: 3;
  grid-row: 1;
  align-self: center;
  transform: rotate(-0.55deg);
}

.wb-board--air .wb-item--air-lab {
  grid-column: 1 / -1;
  grid-row: 2;
}

.wb-board--g .wb-item--g-value-and-sign {
  grid-column: 1;
  grid-row: 1 / 3;
}

.wb-board--g .wb-item--g-is-an-approximation {
  grid-column: 2 / 4;
  grid-row: 1 / 3;
}

.wb-board--upward .wb-item--thrown-up-still-free-fall {
  grid-column: 1 / 3;
  grid-row: 1;
}

.wb-board--upward .wb-item--free-fall-concept-check {
  grid-column: 3;
  grid-row: 1;
  align-self: center;
  transform: rotate(0.45deg);
}

.wb-board--upward .wb-item--upward-reasoning-check {
  grid-column: 1;
  grid-row: 2;
}

.wb-board--upward .wb-item--ap-quantitative-check {
  grid-column: 2 / 4;
  grid-row: 2;
}

.wb-board--explorer .wb-item--motion-explorer,
.wb-board--practice .wb-item--practice-support {
  grid-column: 1 / -1;
  grid-row: 1 / 3;
}

.wb-board--practice .wb-item--course-path-card {
  grid-column: 1 / -1;
  grid-row: 3;
}

.wb-board :where(h1, h2, h3, h4, p, li, label, button, input, select, summary, caption, th, td, dt, dd, output) {
  font-family: var(--wb-hand) !important;
}

.wb-board :where(p, li, label, th, td, dd, figcaption) {
  font-size: 1.13rem;
}

.wb-board :where(.knowledge-block, .knowledge-enhancement, .knowledge-check, .ffx-air-lab, .ffx-explorer, .ffx-study-sheet, .ffx-course-path-card, .ffx-mistakes) {
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.wb-board :where(.knowledge-block, .knowledge-enhancement) {
  margin: 0;
  padding: 0;
}

.wb-board :where(.knowledge-block, .knowledge-enhancement) > h2,
.wb-board :where(.knowledge-block, .knowledge-enhancement) > div > h2 {
  width: fit-content;
  max-width: 100%;
  margin: 0 0 0.65rem;
  color: var(--wb-blue);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.02;
  transform: rotate(-0.35deg);
}

.wb-board :where(.knowledge-block, .knowledge-enhancement) > h2::after,
.wb-board :where(.knowledge-block, .knowledge-enhancement) > div > h2::after {
  display: block;
  width: 104%;
  height: 0.16rem;
  margin-top: 0.14rem;
  border-radius: 50%;
  background: currentColor;
  content: "";
  opacity: 0.72;
  transform: rotate(0.8deg);
}

.wb-board h3 {
  margin-block: 0.45rem;
  color: var(--wb-green);
  font-size: 1.35rem;
  font-weight: 400;
}

.wb-board a {
  color: var(--wb-blue);
  text-decoration-thickness: 0.11em;
  text-underline-offset: 0.15em;
}

.wb-board :focus-visible {
  outline: 4px solid #e4a900;
  outline-offset: 4px;
}

.wb-board .knowledge-table-scroll-hint {
  display: none;
}

.wb-board .knowledge-table-scroll {
  overflow-x: auto;
  border: 0;
}

.wb-board table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
}

.wb-board table caption {
  margin-bottom: 0.55rem;
  color: var(--wb-blue);
  font-size: 1.8rem;
  font-weight: 400;
  text-align: left;
}

.wb-board :where(th, td) {
  padding: 0.5rem 0.62rem;
  border: 1.5px solid rgba(20, 33, 39, 0.64);
  background: rgba(255, 255, 255, 0.08);
  line-height: 1.17;
  vertical-align: top;
}

.wb-board th {
  color: var(--wb-blue);
  font-weight: 400;
}

.wb-board figcaption {
  margin-top: 0.45rem;
  color: #344a51;
  line-height: 1.2;
}

.wb-board .knowledge-worked-example {
  padding: 0.4rem 0.6rem;
}

.wb-board .knowledge-worked-example > h2 {
  font-size: 2.55rem;
}

.wb-board .worked-steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 2.1rem;
  margin-top: 1rem;
}

.wb-board .worked-steps li {
  position: relative;
  padding: 0.7rem 0.9rem;
  border: 2px solid var(--wb-blue);
  border-radius: 48% 52% 49% 51% / 4% 3% 5% 4%;
}

.wb-board .worked-steps li::marker {
  color: var(--wb-red);
  font-size: 1.35rem;
}

.wb-board :where(.knowledge-check, .ffx-checkpoint, .ffx-investigation, .ffx-reasoning-check) {
  padding: 0.9rem 1rem;
  border: 2.5px solid var(--wb-green);
  border-radius: 48% 52% 49% 51% / 4% 3% 5% 4%;
}

.wb-board .knowledge-check h2,
.wb-board .knowledge-check h3 {
  color: var(--wb-green);
}

.wb-board .ffx-checkpoint__label {
  margin: 0;
  color: var(--wb-red);
  font-size: 1.22rem;
}

.wb-board fieldset {
  margin: 0.45rem 0;
  padding: 0;
  border: 0;
}

.wb-board fieldset label {
  margin-block: 0.25rem;
}

.wb-board .button,
.wb-board button {
  padding: 0.48rem 0.72rem;
  border: 2px solid var(--wb-blue);
  border-radius: 0.25rem;
  background: rgba(255, 255, 255, 0.42);
  color: var(--wb-blue);
  box-shadow: none;
  font-size: 1.04rem;
}

.wb-board .button:hover,
.wb-board button:hover {
  background: rgba(6, 79, 209, 0.08);
}

.wb-board .knowledge-prose {
  position: relative;
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--wb-green);
}

.wb-board :where(.knowledge-equation, .knowledge-definition, .knowledge-ap-focus) {
  padding: 0.9rem 1.05rem;
  border: 2.5px solid var(--wb-blue);
  border-radius: 46% 54% 49% 51% / 4% 3% 5% 4%;
}

.wb-board .knowledge-math {
  margin-block: 0.45rem;
  color: var(--wb-blue);
  font-size: 1.65rem;
}

.wb-board .knowledge-math code {
  color: inherit;
  font-family: var(--wb-hand);
  white-space: normal;
}

.wb-board .knowledge-variables {
  display: grid;
  gap: 0.35rem;
}

.wb-board .knowledge-variables > div {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem;
}

.wb-board .knowledge-variables dt {
  color: var(--wb-blue);
}

.wb-board :where(.knowledge-figure, .knowledge-inline-animation, .knowledge-inline-media, .ffx-source-figure) {
  width: min(100%, 480px);
  margin: 0.8rem auto;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.wb-board :where(.knowledge-figure, .knowledge-inline-animation, .knowledge-inline-media, .ffx-source-figure) img {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: 350px;
  margin: auto;
  border: 2px solid var(--wb-blue);
  border-radius: 1.5% 1% 2% 1%;
  background: #fff;
  object-fit: contain;
}

.wb-board .knowledge-figure-credit,
.wb-board .ffx-figure-source,
.wb-board .knowledge-inline-animation small {
  color: #51636a;
  font-family: system-ui, sans-serif !important;
  font-size: 0.65rem;
}

.wb-board .ffx-air-lab,
.wb-board .ffx-explorer {
  position: relative;
  padding: 1rem 1.2rem;
  border: 2.5px solid var(--wb-blue);
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.17);
}

.wb-board .ffx-air-lab::before,
.wb-board .ffx-explorer::before {
  position: absolute;
  top: -0.9rem;
  right: 1.5rem;
  padding: 0 0.35rem;
  background: #fcfdfa;
  color: var(--wb-red);
  content: "try it";
  font-size: 1.15rem;
  transform: rotate(3deg);
}

.wb-board :where(.ffx-drop-track, .ffx-motion-visual, .ffx-readouts, .ffx-controls, .ffx-parameter-table-wrap, .ffx-graphs figure) {
  border-color: rgba(22, 39, 46, 0.34);
  background: rgba(255, 255, 255, 0.38);
  box-shadow: none;
}

.wb-board .ffx-graphs {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.wb-board .ffx-graphs svg {
  background: rgba(255, 255, 255, 0.3);
}

.wb-mousseau-tip {
  width: fit-content;
  margin: 0 0 -0.2rem auto;
  color: var(--wb-red);
  font-size: 1.35rem;
  transform: rotate(2deg);
}

.wb-mousseau-tip span {
  display: inline-block;
  margin-right: 0.25rem;
  font-size: 1.7rem;
}

.wb-full-notes,
.wb-board .knowledge-table-notes {
  margin-top: 0.8rem;
  border: 1.5px dashed rgba(6, 79, 209, 0.62);
  border-radius: 0.3rem;
  background: rgba(255, 255, 255, 0.18);
}

.wb-full-notes > summary,
.wb-board .knowledge-table-notes > summary {
  padding: 0.55rem 0.75rem;
  color: var(--wb-blue);
  cursor: pointer;
  font-size: 1.08rem;
}

.wb-board .knowledge-table-notes figcaption {
  padding: 0 0.75rem 0.7rem;
}

.wb-full-notes__body,
.wb-study-notes > .ffx-study-sheet {
  padding: 0.9rem;
}

.wb-board .ffx-challenge-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}

.wb-board .ffx-challenge-card {
  padding: 0.75rem 0.85rem;
}

.wb-board .ffx-mistakes {
  margin: 1.2rem 0 0.8rem;
  padding: 0.8rem 1rem;
  border: 2.5px solid var(--wb-red);
  border-radius: 51% 49% 53% 47% / 4% 5% 3% 4%;
}

.wb-board .ffx-mistakes h3 {
  color: var(--wb-red);
}

.wb-board .ffx-study-sheet {
  margin: 0;
  padding-top: 0;
  border: 0;
}

.wb-board .ffx-study-grid {
  gap: 1rem;
}

.wb-board .ffx-study-grid article {
  border: 0;
  background: transparent;
}

.wb-board .ffx-course-path-card {
  margin-top: 0;
  padding: 0.9rem 1.1rem;
  border: 2.5px solid var(--wb-green);
  border-radius: 49% 51% 48% 52% / 5% 4% 6% 3%;
}

.wb-board .ffx-course-path-card__eyebrow {
  color: var(--wb-red);
}

.wb-lesson > .kp-curriculum-nav {
  width: calc(100% - 248px);
  margin: 1.2rem 0 0 auto;
}

@media (max-width: 1160px) {
  .wb-top-menu {
    grid-template-columns: 195px minmax(0, 1fr);
  }

  .wb-layout {
    grid-template-columns: 195px minmax(0, 1fr);
  }

  .wb-board {
    gap: 1.8rem 1.5rem;
    padding-inline: 2rem;
  }

  .wb-board :where(p, li, label, th, td, dd, figcaption) {
    font-size: 1rem;
  }

  .wb-lesson > .kp-curriculum-nav {
    width: calc(100% - 195px);
  }
}

@media (max-width: 820px) {
  .wb-top-menu {
    position: relative;
    display: block;
    min-height: 0;
  }

  .wb-top-menu__brand {
    justify-content: center;
    border-right: 0;
    border-bottom: 2px solid rgba(8, 122, 60, 0.4);
  }

  .wb-top-menu nav {
    flex-wrap: wrap;
    gap: 0.85rem 1.2rem;
    justify-content: center;
    padding: 0.8rem 1rem 1rem;
  }

  .wb-layout {
    display: block;
  }

  .wb-rail {
    position: static;
    max-height: none;
    margin-bottom: 0.75rem;
    border-right: 1px solid #c8d0cd;
    border-radius: 0.5rem;
  }

  .wb-rail__sequence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .wb-rail nav,
  .wb-rail__course {
    display: none;
  }

  .wb-board {
    display: block;
    min-height: 0;
    padding: 2.3rem 1rem;
  }

  .wb-board-title {
    margin-bottom: 2.5rem;
  }

  .wb-board-title h1 {
    font-size: clamp(3.5rem, 17vw, 5rem);
  }

  .wb-item {
    margin-bottom: 2.5rem;
    transform: none !important;
  }

  .wb-board .worked-steps,
  .wb-board .ffx-challenge-grid,
  .wb-board .ffx-study-grid,
  .wb-board .ffx-graphs {
    grid-template-columns: 1fr;
  }

  .wb-board table {
    min-width: 600px;
  }

  .wb-lesson > .kp-curriculum-nav {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .wb-lesson *,
  .wb-lesson *::before,
  .wb-lesson *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Build 11: one fixed whiteboard with stationary handwritten menus. */
body.free-fall-whiteboard-preview {
  height: 100vh;
  overflow: hidden;
}

body.free-fall-whiteboard-preview main {
  height: 100vh;
  overflow: hidden;
}

.wb-lesson {
  position: relative;
  box-sizing: border-box;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
  padding: 12px;
}

.wb-surface {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: 66px minmax(0, 1fr);
  height: 100%;
  overflow: hidden;
  border: 1px solid rgba(46, 63, 61, 0.28);
  background:
    radial-gradient(ellipse at 16% 11%, rgba(72, 104, 96, 0.035), transparent 28%),
    radial-gradient(ellipse at 83% 45%, rgba(30, 75, 114, 0.025), transparent 30%),
    repeating-linear-gradient(2deg, rgba(51, 84, 78, 0.01) 0 1px, transparent 1px 15px),
    #fcfdfa;
  box-shadow:
    inset 0 0 2.8rem rgba(45, 67, 62, 0.11),
    inset 0 0 0 1px rgba(46, 63, 61, 0.16);
}

.wb-top-menu {
  position: relative;
  z-index: 4;
  top: auto;
  grid-template-columns: 238px minmax(0, 1fr);
  min-height: 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.wb-top-menu::after {
  right: 1.25rem;
  bottom: 0;
  left: 1.25rem;
  height: 2px;
  background: rgba(6, 79, 209, 0.25);
  transform: rotate(-0.08deg);
}

.wb-top-menu__brand {
  padding: 0.65rem 1rem;
  border: 0;
  color: var(--wb-green);
  font-size: 1.45rem;
}

.wb-top-menu nav {
  gap: clamp(1rem, 2.8vw, 3rem);
  padding: 0.55rem 1.5rem;
}

.wb-layout {
  display: grid;
  grid-template-columns: 238px minmax(0, 1fr);
  min-height: 0;
  overflow: hidden;
  background: transparent;
}

body.free-fall-whiteboard-preview .wb-rail {
  position: relative;
  z-index: 3;
  top: auto;
  align-self: stretch;
  height: auto;
  min-height: 0;
  max-height: none;
  overflow: hidden;
  border: 0;
  border-right: 2px solid rgba(8, 122, 60, 0.22);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  scrollbar-color: rgba(8, 122, 60, 0.28) transparent;
  scrollbar-width: thin;
}

.wb-rail__heading {
  padding: 0.55rem 0.8rem 0.45rem;
}

.wb-rail__heading:has(> .wb-rail__unit) {
  padding-top: 0.9rem;
}

.wb-rail__heading > p {
  margin-bottom: 0.3rem;
  font-size: 1.35rem;
}

.wb-rail__unit {
  width: fit-content;
  color: var(--wb-green);
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  transform: rotate(-0.75deg);
}

.wb-rail__unit::after {
  display: block;
  width: 108%;
  height: 2px;
  margin-top: 0.08rem;
  background: currentColor;
  content: "";
}

.wb-rail__sequence {
  gap: 0.25rem;
  padding: 0.45rem 0.7rem;
}

.wb-rail__sequence--next {
  border-top: 2px solid rgba(6, 79, 209, 0.32);
  border-bottom: 2px solid rgba(6, 79, 209, 0.32);
}

.wb-rail__sequence > a {
  min-height: 2rem;
  padding: 0.25rem 0.1rem;
  font-size: 0.8rem !important;
}

.wb-rail__sequence small {
  font-size: 0.64rem;
}

.wb-rail nav {
  padding: 0.5rem 0.7rem;
}

.wb-rail nav h2 {
  margin-bottom: 0.35rem;
  font-size: 1.08rem;
}

.wb-rail nav a {
  padding: 0.27rem 0.25rem;
  font-size: 0.8rem;
}

.wb-rail__course {
  padding: 0.45rem 0.7rem;
}

.wb-rail__course .ffx-early-course-cta {
  padding: 0.5rem 0.65rem;
}

.wb-rail__course .ffx-early-course-cta p {
  display: none;
}

.wb-rail__course .ffx-early-course-cta h2 {
  font-size: 0.9rem;
}

.wb-rail__course .ffx-early-course-cta a {
  font-size: 0.76rem;
}

body.free-fall-whiteboard-preview .wb-deck {
  display: block;
  align-self: stretch;
  min-width: 0;
  height: auto;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
  background: transparent;
  scrollbar-color: rgba(6, 79, 209, 0.35) transparent;
  scrollbar-width: thin;
  white-space: normal !important;
}

.wb-deck:focus-visible {
  outline: 3px solid rgba(242, 185, 0, 0.85);
  outline-offset: -5px;
}

.wb-scene {
  position: relative;
  min-width: 0;
  padding: 0;
  scroll-margin-top: 1.25rem;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.wb-board {
  min-height: min(760px, calc(100vh - 80px));
  overflow: visible;
  background: transparent;
  box-shadow: none;
}

.wb-board::after {
  display: none;
}

.wb-scene + .wb-scene {
  margin-top: 1rem;
}

.wb-lesson > .kp-curriculum-nav {
  display: none;
}

@media (max-width: 820px) and (orientation: landscape) {
  .wb-surface {
    grid-template-rows: auto minmax(0, 1fr);
  }

  .wb-top-menu {
    display: block;
  }

  .wb-layout {
    display: grid;
    grid-template-columns: 11rem minmax(0, 1fr);
  }

  .wb-rail nav,
  .wb-rail__course {
    display: none;
  }

  .wb-board {
    display: block;
    min-height: 0;
  }
}

@media (max-width: 500px) {
  .wb-surface {
    grid-template-rows: auto minmax(0, 1fr);
  }

  .wb-layout {
    display: block;
  }

  .wb-rail {
    position: static;
    width: auto;
    max-height: none;
  }

  body.free-fall-whiteboard-preview .wb-deck,
  .wb-board {
    width: 100%;
    min-width: 0;
  }
}

/* Shared Knowledge lesson whiteboard conversion. The LMS pilot remains the visual source. */
.wb-knowledge-lesson .kp-content-grid {
  display: grid;
  grid-template-columns: 238px minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
  min-height: 0;
  overflow: hidden;
  background: transparent;
}

.wb-knowledge-lesson .kp-page-rail-inner {
  display: block;
  position: static;
  top: auto;
}

.wb-knowledge-lesson .kp-curriculum-top {
  display: grid;
}

.wb-knowledge-lesson .kp-reading-column {
  grid-column: auto;
  grid-row: auto;
}

.wb-knowledge-lesson .knowledge-body,
.wb-knowledge-lesson .kp-body {
  display: block;
  max-width: none;
  padding: 0;
}

.wb-knowledge-lesson .kp-chapter {
  display: block !important;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.wb-knowledge-lesson .kp-chapter::after {
  display: none !important;
}

.wb-knowledge-lesson .wb-frame {
  box-sizing: border-box;
  width: 100%;
}

.wb-knowledge-lesson .kp-chapter + .kp-chapter {
  margin-top: 1rem;
}

.wb-knowledge-lesson .wb-sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
}

.wb-knowledge-lesson .wb-board--generic {
  grid-template-rows: repeat(2, minmax(190px, auto));
  grid-auto-rows: minmax(150px, auto);
  gap: 1rem 1.35rem;
  align-items: start;
}

.wb-knowledge-lesson .wb-board-title--generic {
  grid-column: 1 / 2;
  grid-row: 1;
}

.wb-knowledge-lesson .wb-board-title--generic h1 {
  font-size: clamp(2.05rem, 2.55vw, 3.15rem);
  line-height: 0.98;
  overflow-wrap: anywhere;
}

.wb-knowledge-lesson .wb-board-title--generic p {
  font-size: 0.88rem;
}

.wb-knowledge-lesson .wb-scene-content > .wb-item {
  min-width: 0;
  max-width: 100%;
}

.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.knowledge-prose),
.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.knowledge-table),
.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.knowledge-worked-example),
.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.kp-tool-embed) {
  grid-column: span 2;
}

.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.knowledge-table):only-child,
.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.knowledge-worked-example):only-child,
.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.kp-tool-embed):only-child {
  grid-column: 1 / -1;
}

.wb-knowledge-lesson .wb-scene-content > .wb-item:has(.knowledge-figure) {
  justify-self: center;
}

.wb-knowledge-lesson .wb-board--generic .knowledge-block {
  max-width: 100%;
}

.wb-knowledge-lesson .wb-board--generic :where(p, li, label, th, td, dd, figcaption) {
  font-size: clamp(0.88rem, 0.82vw, 1.02rem);
  line-height: 1.2;
}

.wb-knowledge-lesson .wb-board--generic :where(.knowledge-block, .knowledge-enhancement) > h2,
.wb-knowledge-lesson .wb-board--generic :where(.knowledge-block, .knowledge-enhancement) > div > h2 {
  margin-bottom: 0.4rem;
  font-size: clamp(1.35rem, 1.8vw, 2rem);
}

.wb-knowledge-lesson .wb-board--generic :where(th, td) {
  padding: 0.34rem 0.45rem;
}

.wb-knowledge-lesson .wb-board--generic .knowledge-prose {
  padding-block: 0.45rem;
}

.wb-knowledge-lesson .wb-board--generic .knowledge-common-error {
  padding: 0.9rem 1rem;
  border: 2.5px solid var(--wb-red);
  border-radius: 51% 49% 53% 47% / 4% 5% 3% 4%;
  background: transparent;
}

.wb-knowledge-lesson .wb-board--generic .knowledge-resource-links {
  padding: 0.9rem 1rem;
  border: 2.5px solid var(--wb-blue);
  border-radius: 48% 52% 49% 51% / 4% 3% 5% 4%;
  background: transparent;
}

.wb-knowledge-lesson .wb-board--generic .kp-tool-embed {
  margin: 0;
  background: rgba(255, 255, 255, 0.18);
}

.wb-knowledge-lesson .wb-final {
  padding: 1rem 1.2rem 1.5rem;
  background: transparent;
}

.wb-knowledge-lesson .kp-final-course,
.wb-knowledge-lesson .kp-curriculum-nav {
  max-width: min(980px, calc(100% - 2rem));
  margin-inline: auto;
  font-family: var(--wb-hand);
}

@media (max-width: 820px) {
  .wb-knowledge-lesson .kp-content-grid {
    display: block;
  }

  .wb-knowledge-lesson .wb-board--generic {
    display: block;
  }

  .wb-knowledge-lesson .wb-scene-content > .wb-item {
    margin-bottom: 2.2rem;
  }
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-content-grid {
  display: grid !important;
  grid-template-columns: 238px minmax(0, 1fr) !important;
  gap: 0 !important;
  min-height: 0 !important;
  overflow: hidden !important;
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-reading-column {
  display: block !important;
  padding: 0 !important;
  background: transparent !important;
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-body {
  display: block !important;
  gap: 0 !important;
  max-width: none !important;
  padding: 0 !important;
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-chapter {
  display: block !important;
  min-height: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-chapter::after {
  display: none !important;
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .wb-frame {
  width: 100% !important;
  padding: 0 !important;
  border: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .wb-frame > .wb-corner {
  display: none !important;
}

@media (max-width: 820px) {
  body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-content-grid {
    display: block !important;
  }
}

@media (max-width: 480px) {
  html,
  body.free-fall-whiteboard-preview,
  body.free-fall-whiteboard-preview main,
  body.free-fall-whiteboard-preview .wb-surface,
  body.free-fall-whiteboard-preview .wb-layout,
  body.free-fall-whiteboard-preview .wb-knowledge-lesson,
  body.free-fall-whiteboard-preview .wb-knowledge-lesson .kp-content-grid,
  body.free-fall-whiteboard-preview .wb-knowledge-lesson .kp-reading-column,
  body.free-fall-whiteboard-preview .wb-knowledge-lesson .kp-body,
  body.free-fall-whiteboard-preview .wb-deck,
  body.free-fall-whiteboard-preview .wb-scene,
  body.free-fall-whiteboard-preview .wb-board,
  body.free-fall-whiteboard-preview .wb-scene-content,
  body.free-fall-whiteboard-preview .wb-item {
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    box-sizing: border-box !important;
    overflow-x: hidden !important;
  }

  body.free-fall-whiteboard-preview .wb-top-menu {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) !important;
    width: 100% !important;
    max-width: 100% !important;
  }

  body.free-fall-whiteboard-preview .wb-top-menu__brand {
    max-width: 100% !important;
    padding-inline: 0.75rem !important;
    overflow-wrap: break-word !important;
    text-align: center !important;
  }

  body.free-fall-whiteboard-preview .wb-top-menu nav {
    display: none !important;
  }

  body.free-fall-whiteboard-preview .wb-layout,
  body.free-fall-whiteboard-preview.knowledge-lesson-page .wb-knowledge-lesson .kp-content-grid {
    display: block !important;
  }

  body.free-fall-whiteboard-preview .wb-rail {
    position: static !important;
    width: 100% !important;
    max-width: 100% !important;
    border-right: 0 !important;
    border-bottom: 2px solid rgba(8, 122, 60, 0.22) !important;
  }

  body.free-fall-whiteboard-preview .wb-deck {
    height: auto !important;
    max-height: none !important;
  }

  body.free-fall-whiteboard-preview .wb-board,
  body.free-fall-whiteboard-preview .wb-knowledge-lesson .wb-board--generic {
    display: block !important;
    min-height: 0 !important;
  }

  body.free-fall-whiteboard-preview :where(h1, h2, h3, p, li, a, span, small, strong, td, th, label, button) {
    max-width: 100% !important;
    overflow-wrap: break-word !important;
    word-break: normal !important;
  }

  body.free-fall-whiteboard-preview .wb-board-title h1,
  body.free-fall-whiteboard-preview .wb-knowledge-lesson .wb-board-title--generic h1 {
    font-size: clamp(2.1rem, 13vw, 2.8rem) !important;
    line-height: 0.96 !important;
  }

  body.free-fall-whiteboard-preview :where(img, svg, video, iframe, canvas) {
    max-width: 100% !important;
    height: auto !important;
  }
}