.course-page {
  --cs-rule-dark: #5b4a43;
  --cs-ink-on-dark: #fffaf6;
  --cs-ink-soft-dark: #d0c2ba;
  overflow-x: clip;
}

.course-page main {
  overflow: clip;
}

.course-page .site-header {
  background: color-mix(in srgb, var(--paper) 96%, transparent);
}

.course-page .site-nav a:first-child {
  color: var(--brand-dark);
}

.course-page h1,
.course-page h2,
.course-page h3,
.course-page p {
  text-wrap: pretty;
}

.course-page .button,
.cs-text-action,
.cs-button-dark {
  border-radius: 7px;
}

.course-page .button svg,
.cs-text-action svg,
.cs-button-dark svg {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.cs-hero {
  position: relative;
  border-inline: 1px solid var(--line);
  background: var(--paper);
}

.cs-hero::before {
  content: "";
  position: absolute;
  inset: 0 48% 0 auto;
  width: 1px;
  background: linear-gradient(to bottom, transparent 5%, var(--line) 30%, var(--line) 70%, transparent 95%);
  opacity: 0.52;
  pointer-events: none;
}

.cs-hero-grid {
  min-height: min(760px, calc(100vh - 72px));
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(620px, 1.05fr);
  align-items: center;
  gap: clamp(2.5rem, 4vw, 4.5rem);
  padding: clamp(3.5rem, 6vw, 6.5rem) clamp(1.2rem, 4vw, 4.25rem);
}

.cs-hero-copy {
  position: relative;
  z-index: 2;
}

.cs-hero-copy h1 {
  max-width: 11.5ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.5rem, 5vw, 5.35rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.cs-hero-copy h1 span {
  color: var(--brand);
}

.cs-hero-copy > p:not(.cs-availability) {
  max-width: 56ch;
  margin: clamp(1.7rem, 3vw, 2.5rem) 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.02rem, 1.25vw, 1.18rem);
  line-height: 1.62;
}

.cs-hero-actions,
.cs-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.cs-text-action {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  border: 1px solid transparent;
  padding: 0.8rem 0.2rem;
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.cs-text-action span {
  border-bottom: 1px solid currentColor;
  padding-bottom: 0.18rem;
}

.cs-text-action svg,
.cs-button-dark svg {
  transition: transform 180ms var(--ease-out);
}

.cs-text-action:hover svg,
.cs-button-dark:hover svg {
  transform: translateX(4px);
}

.cs-availability {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 1.25rem 0 0;
  color: var(--ink-soft);
  font-size: 0.76rem;
  font-weight: 600;
}

.cs-availability::before {
  content: "";
  width: 0.48rem;
  height: 0.48rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--brand);
}

.cs-handoff {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 118px minmax(0, 1fr);
  align-items: center;
  gap: 0.65rem;
  padding-top: 2rem;
}

.cs-handoff::before,
.cs-handoff::after {
  content: "";
  position: absolute;
  z-index: -1;
  border: 1px solid var(--brand-wash);
  border-radius: 50%;
  pointer-events: none;
}

.cs-handoff::before {
  width: 460px;
  height: 460px;
  right: 2%;
  top: -13%;
}

.cs-handoff::after {
  width: 290px;
  height: 290px;
  right: 14%;
  top: 3%;
}

.cs-illustrative-note {
  position: absolute;
  top: 0;
  right: 0;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.cs-app-window {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--paper-bright);
  box-shadow: 0 18px 34px rgba(74, 35, 17, 0.16);
}

.cs-app-window--seller {
  transform: translateY(18px) rotate(-0.6deg);
}

.cs-app-window--learner {
  transform: translateY(-20px) rotate(0.45deg);
}

.cs-app-bar {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0.65rem 0.8rem;
  background: var(--paper-bright);
  font-size: 0.66rem;
}

.cs-app-bar > span {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.cs-app-bar > span i {
  width: 0.45rem;
  height: 0.45rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--brand);
}

.cs-app-bar small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.52rem;
  white-space: nowrap;
}

.cs-seller-body,
.cs-learner-body {
  min-height: 336px;
  padding: 1rem;
}

.cs-course-title,
.cs-reader-head,
.cs-source-state,
.cs-note-state,
.cs-panel-title,
.cs-feedback-strip article > div:first-child,
.cs-outcome-before,
.cs-outcome-after {
  display: flex;
  align-items: center;
}

.cs-course-title {
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.cs-course-mark {
  width: 42px;
  height: 42px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 9px 3px 9px 3px;
  background: var(--brand);
  color: var(--white);
  font-family: var(--display);
  font-size: 1rem;
}

.cs-course-title > span:last-child,
.cs-reader-head > span,
.cs-source-state span,
.cs-note-state span,
.cs-panel-title span,
.cs-feedback-strip article > div:first-child span,
.cs-outcome-before span,
.cs-outcome-after span {
  min-width: 0;
  display: grid;
  gap: 0.12rem;
}

.cs-course-title strong,
.cs-reader-head strong {
  font-size: 0.8rem;
}

.cs-course-title small,
.cs-reader-head small {
  color: var(--ink-soft);
  font-size: 0.6rem;
}

.cs-module-list {
  display: grid;
  gap: 0;
  margin-top: 0.8rem;
}

.cs-module-list > span {
  min-height: 45px;
  display: grid;
  grid-template-columns: 22px 7px 1fr;
  align-items: center;
  gap: 0.55rem;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 65%, transparent);
  color: var(--ink-soft);
}

.cs-module-list b {
  font-family: var(--mono);
  font-size: 0.53rem;
  font-weight: 400;
}

.cs-module-list i {
  width: 7px;
  height: 7px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
}

.cs-module-list small {
  overflow: hidden;
  font-size: 0.63rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cs-module-list .is-complete i {
  border-color: var(--brand);
  background: var(--brand);
}

.cs-module-list .is-current {
  color: var(--ink);
  font-weight: 600;
}

.cs-module-list .is-current i {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(195, 66, 13, 0.12);
}

.cs-source-state,
.cs-note-state {
  gap: 0.65rem;
  margin-top: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.65rem;
  background: var(--paper);
}

.cs-source-state svg,
.cs-note-state svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.5;
}

.cs-source-state strong,
.cs-note-state strong {
  font-size: 0.65rem;
}

.cs-source-state small,
.cs-note-state small {
  color: var(--ink-soft);
  font-size: 0.54rem;
}

.cs-protected-link {
  display: grid;
  justify-items: center;
  gap: 0.48rem;
  text-align: center;
}

.cs-link-line {
  position: absolute;
  z-index: -1;
  right: 26%;
  left: 26%;
  height: 1px;
  background: var(--brand);
}

.cs-link-line::before,
.cs-link-line::after {
  content: "";
  position: absolute;
  top: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

.cs-link-line::before {
  left: 0;
}

.cs-link-line::after {
  right: 0;
}

.cs-link-packet {
  position: absolute;
  top: -4px;
  left: 0;
  width: 9px;
  height: 9px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 5px 15px rgba(195, 66, 13, 0.38);
  animation: cs-handoff-packet 3.8s var(--ease-out) infinite;
}

.cs-link-badge {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border: 1px solid var(--brand);
  border-radius: 14px 5px 14px 5px;
  background: var(--paper-bright);
  color: var(--brand);
  box-shadow: 0 10px 22px rgba(84, 55, 17, 0.14);
}

.cs-link-badge svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.cs-protected-link strong {
  font-size: 0.68rem;
}

.cs-protected-link small {
  max-width: 14ch;
  color: var(--ink-soft);
  font-size: 0.56rem;
  line-height: 1.35;
}

.cs-reader-head {
  justify-content: space-between;
  gap: 1rem;
}

.cs-reader-head svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.45;
}

.cs-progress-row,
.cs-reader-preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 0.54rem;
}

.cs-progress-row strong,
.cs-reader-preview-head strong {
  color: var(--brand);
  font-weight: 400;
}

.cs-progress-track,
.cs-reader-preview-progress {
  height: 4px;
  display: block;
  overflow: hidden;
  margin-top: 0.45rem;
  border-radius: 999px;
  background: var(--paper-muted);
}

.cs-progress-track i,
.cs-reader-preview-progress i {
  width: 42%;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: var(--brand);
}

.cs-reader-sheet {
  min-height: 146px;
  display: grid;
  align-content: start;
  gap: 0.5rem;
  margin-top: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8rem;
  background: var(--white);
}

.cs-reader-sheet small {
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.5rem;
}

.cs-reader-sheet strong {
  margin-bottom: 0.25rem;
  font-size: 0.72rem;
}

.cs-reader-sheet > i,
.cs-reader-preview-page > i {
  width: 100%;
  height: 5px;
  display: block;
  border-radius: 999px;
  background: var(--paper-muted);
}

.cs-reader-sheet > i:last-of-type,
.cs-reader-preview-page > i:nth-of-type(3) {
  width: 68%;
}

@keyframes cs-handoff-packet {
  0%,
  12% {
    transform: translateX(0);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  78% {
    opacity: 1;
  }
  88%,
  100% {
    transform: translateX(calc(100% - 9px));
    opacity: 0;
  }
}

.cs-problems {
  border-block: 1px solid var(--cs-rule-dark);
  background: var(--graphite);
  color: var(--cs-ink-on-dark);
}

.cs-problems-inner {
  border-inline: 1px solid var(--cs-rule-dark);
  padding: var(--section-space) clamp(1.2rem, 4vw, 4.25rem);
}

.cs-section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.72fr);
  align-items: end;
  gap: clamp(2rem, 6vw, 7rem);
  margin-bottom: clamp(3rem, 6vw, 5.5rem);
}

.cs-section-heading h2 {
  max-width: 16ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.65rem, 4.6vw, 4.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.94;
}

.cs-section-heading p {
  max-width: 58ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.25vw, 1.13rem);
  line-height: 1.66;
}

.cs-section-heading--dark p {
  color: var(--cs-ink-soft-dark);
}

.cs-problem-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-block: 1px solid var(--cs-rule-dark);
  padding: 0;
  list-style: none;
  counter-reset: cs-problem;
}

.cs-problem-track li {
  position: relative;
  min-height: 285px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-content: start;
  gap: clamp(1.15rem, 2.4vw, 2rem);
  border-left: 1px solid var(--cs-rule-dark);
  padding: clamp(1.6rem, 3vw, 2.5rem);
  counter-increment: cs-problem;
}

.cs-problem-track li:nth-child(odd) {
  border-left: 0;
}

.cs-problem-track li:nth-child(n + 3) {
  border-top: 1px solid var(--cs-rule-dark);
}

.cs-problem-node {
  position: relative;
  z-index: 1;
  width: 66px;
  height: 66px;
  display: grid;
  place-items: center;
  border: 1px solid var(--cs-rule-dark);
  border-radius: 50%;
  background: var(--graphite);
  color: var(--brand-light);
}

.cs-problem-node::after {
  content: counter(cs-problem, decimal-leading-zero);
  position: absolute;
  right: -0.55rem;
  bottom: -0.35rem;
  min-width: 28px;
  min-height: 22px;
  display: grid;
  place-items: center;
  border-radius: 4px;
  background: var(--brand);
  color: var(--white);
  font-family: var(--mono);
  font-size: 0.52rem;
}

.cs-problem-node svg {
  width: 25px;
  height: 25px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.45;
}

.cs-problem-track li > div {
  display: grid;
  align-content: start;
  gap: 0.9rem;
}

.cs-problem-track strong {
  max-width: 27ch;
  font-size: clamp(1.18rem, 1.65vw, 1.5rem);
  line-height: 1.2;
}

.cs-problem-track p {
  max-width: 58ch;
  margin: 0;
  color: var(--cs-ink-soft-dark);
  font-size: clamp(0.9rem, 1.05vw, 0.98rem);
  line-height: 1.65;
}

.cs-problem-cost {
  display: grid;
  grid-template-columns: minmax(88px, auto) minmax(0, 1fr);
  align-items: start;
  gap: 0.9rem;
  border-top: 1px solid var(--cs-rule-dark);
  margin-top: 0.2rem;
  padding-top: 0.9rem;
}

.cs-problem-cost > span {
  color: var(--brand-light);
  font-family: var(--mono);
  font-size: 0.56rem;
  line-height: 1.45;
  text-transform: uppercase;
}

.cs-problem-cost small {
  color: var(--brand-light);
  font-size: 0.76rem;
  line-height: 1.55;
}

.cs-product {
  border-inline: 1px solid var(--line);
  padding: var(--section-space) clamp(1.2rem, 4vw, 4.25rem);
}

.cs-system-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(280px, 1fr);
  align-items: end;
  gap: clamp(2rem, 6vw, 7rem);
  margin: clamp(4rem, 7vw, 7rem) 0 clamp(1.5rem, 3vw, 2.25rem);
  border-top: 1px solid var(--line-strong);
  padding-top: clamp(1.5rem, 3vw, 2.5rem);
}

.cs-system-intro h3 {
  max-width: 21ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.65rem, 2.6vw, 2.55rem);
  letter-spacing: -0.035em;
  line-height: 1;
}

.cs-system-intro p {
  max-width: 62ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.65;
}

.cs-system {
  overflow: hidden;
  max-width: 1220px;
  margin-inline: auto;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--paper-bright);
  box-shadow: 0 22px 48px rgba(74, 35, 17, 0.1);
}

.cs-system-bar {
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 1.1rem;
}

.cs-system-bar strong {
  font-size: 0.9rem;
}

.cs-system-bar > span {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.6rem;
}

.cs-system-bar > span i,
.cs-secure-chip i {
  width: 0.48rem;
  height: 0.48rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--brand);
}

.cs-system-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 82px minmax(230px, 0.82fr) 82px minmax(0, 1fr);
  align-items: stretch;
  padding: clamp(1.2rem, 2.5vw, 2.4rem);
}

.cs-system-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--paper);
}

.cs-panel-title {
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.cs-panel-title > svg,
.cs-feedback-strip article > div:first-child > svg {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.4;
}

.cs-panel-title small,
.cs-feedback-strip article > div:first-child small {
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.54rem;
}

.cs-panel-title strong,
.cs-feedback-strip article > div:first-child strong {
  font-size: 0.85rem;
}

.cs-library-list {
  display: grid;
  margin-top: 0.8rem;
}

.cs-library-list > span {
  min-height: 46px;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.55rem;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
}

.cs-library-list svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.45;
}

.cs-library-list b {
  overflow: hidden;
  font-size: 0.64rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cs-library-list small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.49rem;
}

.cs-system-panel > p {
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.55;
}

.cs-system-connector {
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 0.65rem;
}

.cs-system-connector > span {
  position: relative;
  width: 100%;
  height: 1px;
  background: var(--brand);
}

.cs-system-connector > span::after {
  content: "";
  position: absolute;
  top: -4px;
  right: 0;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--brand);
  border-right: 1px solid var(--brand);
  transform: rotate(45deg);
}

.cs-system-connector > span i {
  position: absolute;
  top: -3px;
  left: 45%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

.cs-system-connector small {
  max-width: 10ch;
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.48rem;
  line-height: 1.35;
  text-align: center;
}

.cs-system-guard {
  display: grid;
  align-content: center;
  justify-items: center;
  border-color: var(--brand-light);
  background: var(--brand-wash);
  text-align: center;
}

.cs-guard-mark {
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  border: 1px solid var(--brand);
  border-radius: 17px 5px 17px 5px;
  background: var(--paper-bright);
  color: var(--brand);
}

.cs-guard-mark svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.cs-system-guard > small {
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.54rem;
}

.cs-system-guard > strong {
  max-width: 16ch;
  margin-top: 0.45rem;
  font-size: 1rem;
  line-height: 1.25;
}

.cs-system-guard ul {
  width: 100%;
  display: grid;
  gap: 0.6rem;
  margin: 1.2rem 0;
  padding: 0;
  list-style: none;
  text-align: left;
}

.cs-system-guard li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.65rem;
}

.cs-system-guard li svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.7;
}

.cs-secure-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--brand-light);
  border-radius: 999px;
  padding: 0.45rem 0.6rem;
  background: var(--paper-bright);
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.5rem;
}

.cs-reader-preview {
  margin-top: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8rem;
  background: var(--white);
}

.cs-reader-preview-head {
  margin-top: 0;
}

.cs-reader-preview-page {
  min-height: 150px;
  display: grid;
  align-content: start;
  gap: 0.55rem;
  margin-top: 1rem;
}

.cs-reader-preview-page > small {
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.52rem;
}

.cs-reader-preview-page > span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.45rem;
  border-top: 1px solid var(--line);
  padding-top: 0.7rem;
  color: var(--ink-soft);
  font-size: 0.6rem;
}

.cs-reader-preview-page > span svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.4;
}

.cs-feedback-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line-strong);
}

.cs-feedback-strip article {
  position: relative;
  min-height: 240px;
  padding: clamp(1.25rem, 3vw, 2.25rem);
}

.cs-feedback-strip article + article {
  border-left: 1px solid var(--line-strong);
}

.cs-feedback-strip article > div:first-child {
  gap: 0.8rem;
}

.cs-feedback-strip article > p {
  max-width: 60ch;
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.58;
}

.cs-activity-bars {
  height: 70px;
  display: flex;
  align-items: end;
  gap: 0.5rem;
  margin-top: 1.3rem;
  border-bottom: 1px solid var(--line);
  padding-inline: 0.5rem;
}

.cs-activity-bars i {
  width: min(44px, 12%);
  height: 28%;
  display: block;
  border-radius: 4px 4px 0 0;
  background: var(--paper-muted);
}

.cs-activity-bars i:nth-child(2) {
  height: 52%;
}

.cs-activity-bars i:nth-child(3) {
  height: 43%;
}

.cs-activity-bars i:nth-child(4) {
  height: 78%;
  background: var(--brand-light);
}

.cs-activity-bars i:nth-child(5) {
  height: 64%;
}

.cs-activity-bars i:nth-child(6) {
  height: 92%;
  background: var(--brand);
}

.cs-version-flow {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.65rem;
}

.cs-version-flow span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.6rem;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.54rem;
}

.cs-version-flow span.is-current {
  border-color: var(--brand);
  background: var(--brand);
  color: var(--white);
}

.cs-version-flow i {
  position: relative;
  height: 1px;
  background: var(--brand-light);
}

.cs-version-flow i::after {
  content: "";
  position: absolute;
  top: -3px;
  right: 0;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--brand);
  border-right: 1px solid var(--brand);
  transform: rotate(45deg);
}

.cs-version-flow b {
  min-width: 30px;
  min-height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.55rem;
  font-weight: 400;
}

.cs-capability-rail {
  display: grid;
  margin: 0;
  border-block: 1px solid var(--line-strong);
  padding: 0;
  list-style: none;
}

.cs-capability-rail > li {
  min-height: 240px;
  display: grid;
  grid-template-columns: minmax(190px, 0.72fr) minmax(320px, 1.35fr) minmax(230px, 0.8fr);
  align-items: start;
  gap: clamp(1.5rem, 3.6vw, 4rem);
  padding: clamp(1.75rem, 3.2vw, 3rem) clamp(0.25rem, 1vw, 1rem);
}

.cs-capability-rail > li + li {
  border-top: 1px solid var(--line);
}

.cs-capability-rail > li:nth-child(even) {
  background: color-mix(in srgb, var(--paper-bright) 42%, transparent);
}

.cs-pillar-title {
  display: grid;
  gap: 1.2rem;
}

.cs-pillar-title > span {
  color: var(--brand);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.cs-pillar-title h3 {
  max-width: 18ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2vw, 1.95rem);
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.cs-pillar-main > p,
.cs-pillar-result p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.66;
}

.cs-pillar-main > p {
  max-width: 62ch;
  font-size: clamp(0.94rem, 1.1vw, 1.02rem);
}

.cs-pillar-main ul {
  display: grid;
  gap: 0.55rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.cs-pillar-main li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--ink);
  font-size: 0.78rem;
  line-height: 1.5;
}

.cs-pillar-main li::before {
  content: "";
  position: absolute;
  top: 0.56em;
  left: 0;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--brand);
}

.cs-pillar-result {
  border-left: 1px solid var(--line);
  padding-left: clamp(1.25rem, 2.5vw, 2.5rem);
}

.cs-pillar-result small {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.56rem;
  text-transform: uppercase;
}

.cs-pillar-result p {
  color: var(--ink);
  font-size: 0.88rem;
}

.cs-outcomes {
  border-block: 1px solid var(--line-strong);
  background: var(--brand-wash);
}

.cs-outcomes-inner {
  border-inline: 1px solid var(--line-strong);
  padding: var(--section-space) clamp(1.2rem, 4vw, 4.25rem);
}

.cs-outcome-ledger {
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--paper-bright) 62%, transparent);
}

.cs-outcome-head,
.cs-outcome-ledger article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1fr);
  align-items: stretch;
}

.cs-outcome-head {
  min-height: 52px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.cs-outcome-head > span {
  display: flex;
  align-items: center;
  padding: 0.7rem clamp(1rem, 2.2vw, 2rem);
}

.cs-outcome-head > span:nth-child(2) {
  border-inline: 1px solid var(--line);
  background: var(--brand-wash);
}

.cs-outcome-head > span:first-child {
  background: color-mix(in srgb, var(--graphite) 7%, var(--paper));
  color: var(--ink-soft);
}

.cs-outcome-head > span:nth-child(3) {
  background: var(--brand);
  color: var(--white);
}

.cs-outcome-ledger article {
  min-height: 150px;
  border-bottom: 1px solid var(--line-strong);
}

.cs-outcome-ledger article:last-child {
  border-bottom: 0;
}

.cs-outcome-before,
.cs-outcome-after {
  gap: clamp(0.9rem, 2vw, 1.4rem);
  padding: clamp(1rem, 2.2vw, 2rem);
}

.cs-outcome-before > svg,
.cs-outcome-after > svg {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  box-sizing: border-box;
  border-radius: 50%;
  padding: 9px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.cs-outcome-before {
  background: color-mix(in srgb, var(--graphite) 6%, var(--paper));
  color: var(--ink-soft);
}

.cs-outcome-after {
  background: var(--paper-bright);
  color: var(--brand-dark);
}

.cs-outcome-before > svg {
  border: 1px solid var(--line-strong);
  color: var(--line-strong);
}

.cs-outcome-after > svg {
  background: var(--brand);
  color: var(--white);
}

.cs-outcome-before strong,
.cs-outcome-after strong {
  color: var(--ink);
  font-size: clamp(0.9rem, 1.2vw, 1.08rem);
}

.cs-outcome-before strong {
  color: var(--ink-soft);
}

.cs-outcome-before small,
.cs-outcome-after small {
  color: inherit;
  font-size: 0.76rem;
  line-height: 1.5;
}

.cs-outcome-before .cs-outcome-side-label,
.cs-outcome-after .cs-outcome-side-label {
  display: none;
  color: var(--brand-dark);
  font-family: var(--mono);
  font-size: 0.55rem;
  text-transform: uppercase;
}

.cs-outcome-arrow {
  display: grid;
  place-items: center;
  border-inline: 1px solid var(--line);
  background: var(--brand-wash);
  color: var(--brand);
}

.cs-outcome-arrow svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.cs-cta {
  border-bottom: 1px solid var(--cs-rule-dark);
  background: var(--graphite);
  color: var(--cs-ink-on-dark);
}

.cs-cta-grid {
  min-height: 570px;
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(460px, 1.14fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 8rem);
  border-inline: 1px solid var(--cs-rule-dark);
  padding: var(--section-space) clamp(1.2rem, 4vw, 4.25rem);
}

.cs-cta-copy h2 {
  max-width: 14ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.65rem, 4.7vw, 4.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.94;
}

.cs-cta-copy > p:not(.cs-cta-status) {
  max-width: 57ch;
  margin: 1.6rem 0 0;
  color: var(--cs-ink-soft-dark);
  font-size: 1rem;
  line-height: 1.65;
}

.cs-button-dark {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1.3rem;
  border: 1px solid var(--cs-rule-dark);
  padding: 0.8rem 1rem;
  background: var(--graphite-raised);
  color: var(--cs-ink-on-dark);
  font-family: var(--mono);
  font-size: 0.75rem;
  transition: border-color 180ms var(--ease-out), background-color 180ms var(--ease-out);
}

.cs-button-dark:hover {
  border-color: var(--brand-light);
  background: #3a2924;
}

.cs-cta-status {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 1.25rem 0 0;
  color: var(--brand-light);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.cs-cta-status i {
  width: 0.48rem;
  height: 0.48rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--brand);
}

.cs-cta-loop {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 70px minmax(0, 1fr) 70px minmax(0, 1fr);
  align-items: center;
}

.cs-cta-loop::before {
  content: "";
  position: absolute;
  inset: -70px -40px;
  border: 1px solid var(--cs-rule-dark);
  border-radius: 50%;
  opacity: 0.58;
}

.cs-cta-loop article {
  position: relative;
  z-index: 1;
  min-height: 180px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 1rem;
  border: 1px solid var(--cs-rule-dark);
  border-radius: 14px 5px 14px 5px;
  padding: 1rem;
  background: var(--graphite-raised);
  text-align: center;
}

.cs-cta-loop article:nth-of-type(2) {
  border-color: var(--brand);
  background: var(--brand-dark);
  transform: translateY(-28px);
}

.cs-cta-loop article svg {
  width: 34px;
  height: 34px;
  fill: none;
  stroke: var(--brand-light);
  stroke-width: 1.35;
}

.cs-cta-loop article span {
  display: grid;
  gap: 0.4rem;
}

.cs-cta-loop article small {
  color: var(--brand-light);
  font-family: var(--mono);
  font-size: 0.52rem;
}

.cs-cta-loop article strong {
  font-size: 0.77rem;
  line-height: 1.4;
}

.cs-cta-path {
  position: relative;
  z-index: 2;
  height: 1px;
  background: var(--brand);
}

.cs-cta-path::after {
  content: "";
  position: absolute;
  top: -4px;
  right: 0;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--brand);
  border-right: 1px solid var(--brand);
  transform: rotate(45deg);
}

.cs-cta-path i {
  position: absolute;
  top: -3px;
  left: 40%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-light);
}

@media (max-width: 1260px) {
  .cs-hero-grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(570px, 1.12fr);
    gap: 2rem;
  }

  .cs-hero-copy h1 {
    font-size: clamp(3.25rem, 5vw, 4.8rem);
  }

  .cs-handoff {
    grid-template-columns: minmax(0, 1fr) 92px minmax(0, 1fr);
  }

  .cs-seller-body,
  .cs-learner-body {
    padding: 0.85rem;
  }

  .cs-system-flow {
    grid-template-columns: minmax(0, 1fr) 54px minmax(210px, 0.82fr) 54px minmax(0, 1fr);
  }

  .cs-system-connector small {
    display: none;
  }

  .cs-cta-grid {
    gap: 3rem;
  }
}

@media (max-width: 1080px) {
  .cs-hero::before {
    display: none;
  }

  .cs-hero-grid {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 3.25rem;
  }

  .cs-hero-copy {
    max-width: 850px;
  }

  .cs-hero-copy h1 {
    max-width: 12ch;
  }

  .cs-handoff {
    grid-template-columns: minmax(0, 1fr) 120px minmax(0, 1fr);
    max-width: 830px;
    width: 100%;
    margin-inline: auto;
  }

  .cs-problem-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cs-problem-track li {
    min-height: 0;
    gap: 1.25rem;
    padding: 1.6rem;
  }

  .cs-problem-track li:nth-child(odd) {
    border-left: 0;
  }

  .cs-problem-node {
    width: 56px;
    height: 56px;
  }

  .cs-system-flow {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .cs-system-panel {
    min-height: 0;
  }

  .cs-system-connector {
    min-height: 82px;
  }

  .cs-system-connector > span {
    width: 1px;
    height: 100%;
  }

  .cs-system-connector > span::after {
    top: auto;
    right: -4px;
    bottom: 0;
    transform: rotate(135deg);
  }

  .cs-system-connector > span i {
    top: 46%;
    left: -3px;
  }

  .cs-system-connector small {
    position: absolute;
    display: block;
    margin-left: 5.5rem;
  }

  .cs-system-guard {
    padding-block: 2rem;
  }

  .cs-capability-rail > li {
    grid-template-columns: minmax(170px, 0.65fr) minmax(0, 1.35fr);
  }

  .cs-pillar-result {
    grid-column: 2;
    border-top: 1px solid var(--line);
    border-left: 0;
    padding: 1.25rem 0 0;
  }

  .cs-cta-grid {
    grid-template-columns: 1fr;
  }

  .cs-cta-copy {
    max-width: 760px;
  }

  .cs-cta-loop {
    max-width: 760px;
    width: 100%;
    margin-inline: auto;
  }
}

@media (max-width: 760px) {
  .cs-hero-grid,
  .cs-problems-inner,
  .cs-product,
  .cs-outcomes-inner,
  .cs-cta-grid {
    padding-inline: 1rem;
  }

  .cs-section-heading {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.4rem;
  }

  .cs-section-heading h2 {
    max-width: 18ch;
  }

  .cs-problem-track {
    grid-template-columns: 1fr;
  }

  .cs-problem-track li,
  .cs-problem-track li:nth-child(odd),
  .cs-problem-track li:nth-child(even) {
    grid-template-columns: auto minmax(0, 1fr);
    border-top: 1px solid var(--cs-rule-dark);
    border-left: 0;
    padding: 1.5rem 0;
  }

  .cs-problem-track li:first-child {
    border-top: 0;
  }

  .cs-system-intro {
    grid-template-columns: 1fr;
    gap: 1.1rem;
  }

  .cs-capability-rail > li {
    grid-template-columns: 1fr;
    gap: 1.4rem;
    padding: 1.75rem 0.25rem;
  }

  .cs-pillar-title {
    gap: 0.75rem;
  }

  .cs-pillar-title h3 {
    max-width: 24ch;
  }

  .cs-pillar-result {
    grid-column: auto;
    padding-top: 1rem;
  }

  .cs-handoff {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 2.5rem;
  }

  .cs-handoff::before {
    width: 420px;
    height: 420px;
    right: -42%;
    top: 8%;
  }

  .cs-handoff::after {
    display: none;
  }

  .cs-app-window--seller,
  .cs-app-window--learner {
    transform: none;
  }

  .cs-protected-link {
    min-height: 112px;
    align-content: center;
  }

  .cs-link-line {
    top: auto;
    right: auto;
    bottom: 26%;
    left: 50%;
    width: 1px;
    height: 48%;
  }

  .cs-link-line::before,
  .cs-link-line::after {
    top: auto;
    left: -3px;
  }

  .cs-link-line::before {
    top: 0;
  }

  .cs-link-line::after {
    right: auto;
    bottom: 0;
  }

  .cs-link-packet {
    top: 0;
    left: -4px;
    animation-name: cs-handoff-packet-mobile;
  }

  .cs-protected-link strong,
  .cs-protected-link small {
    position: absolute;
    left: calc(50% + 42px);
    text-align: left;
  }

  .cs-protected-link strong {
    transform: translateY(-9px);
  }

  .cs-protected-link small {
    transform: translateY(13px);
  }

  .cs-feedback-strip {
    grid-template-columns: 1fr;
  }

  .cs-feedback-strip article + article {
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .cs-outcome-head {
    display: none;
  }

  .cs-outcome-ledger article {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .cs-outcome-before,
  .cs-outcome-after {
    padding: 1.25rem;
  }

  .cs-outcome-before .cs-outcome-side-label,
  .cs-outcome-after .cs-outcome-side-label {
    display: block;
  }

  .cs-outcome-arrow {
    min-height: 44px;
    border-block: 1px solid var(--line);
    border-inline: 0;
    background: var(--brand-wash);
  }

  .cs-outcome-arrow svg {
    transform: rotate(90deg);
  }

  .cs-cta-loop {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .cs-cta-loop::before {
    inset: -40px 15%;
  }

  .cs-cta-loop article {
    width: min(100%, 320px);
    min-height: 140px;
    justify-self: center;
  }

  .cs-cta-loop article:nth-of-type(2) {
    transform: none;
  }

  .cs-cta-path {
    width: 1px;
    height: 64px;
    justify-self: center;
  }

  .cs-cta-path::after {
    top: auto;
    right: -4px;
    bottom: 0;
    transform: rotate(135deg);
  }

  .cs-cta-path i {
    top: 42%;
    left: -3px;
  }
}

@keyframes cs-handoff-packet-mobile {
  0%,
  12% {
    transform: translateY(0);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  78% {
    opacity: 1;
  }
  88%,
  100% {
    transform: translateY(calc(100% - 9px));
    opacity: 0;
  }
}

@media (max-width: 560px) {
  .cs-hero-copy h1 {
    font-size: clamp(2.75rem, 12.5vw, 3.35rem);
  }

  .cs-hero-actions,
  .cs-cta-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .cs-hero-actions .button,
  .cs-hero-actions .cs-text-action,
  .cs-cta-actions .button,
  .cs-cta-actions .cs-button-dark {
    width: 100%;
  }

  .cs-system-flow {
    padding: 0.75rem;
  }

  .cs-system-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  .cs-version-flow {
    grid-template-columns: auto 1fr auto;
  }

  .cs-version-flow b {
    display: none;
  }

  .cs-section-heading h2,
  .cs-cta-copy h2 {
    font-size: clamp(2rem, 9.5vw, 3.05rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .cs-link-packet {
    left: calc(50% - 5px);
    animation: none;
    opacity: 1;
  }

  .cs-text-action svg,
  .cs-button-dark svg {
    transition: none;
  }
}