body {
  overflow-x: hidden;
}

button {
  background: transparent;
  cursor: pointer;
}

.flow-app {
  min-height: 100svh;
}

.flow-mast {
  position: relative;
  z-index: 20;
  display: grid;
  min-height: 4.25rem;
  grid-template-columns: minmax(14rem, 1fr) auto minmax(14rem, 1fr) auto;
  align-items: stretch;
  border-bottom: 1px solid var(--line-strong);
  background: var(--canvas);
}

.flow-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0 1.25rem;
  font: 700 0.84rem/1 var(--font-display);
  letter-spacing: -0.03em;
  text-decoration: none;
  text-transform: uppercase;
}

.flow-logo {
  display: block;
  width: 1.8rem;
  height: 1.8rem;
  flex: 0 0 auto;
  background: var(--accent-strong);
  -webkit-mask: url("../logo/syntax-monument-mark.svg") center / contain no-repeat;
  mask: url("../logo/syntax-monument-mark.svg") center / contain no-repeat;
}

.flow-brand small {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--muted);
  font: 600 0.55rem var(--font-mono);
  letter-spacing: 0.14em;
}

.flow-location,
.view-switch,
.manifest-open {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.flow-location {
  display: grid;
  place-items: center;
  color: var(--dim);
}

.view-switch {
  display: flex;
  justify-self: end;
  border-left: 1px solid var(--line);
}

.view-switch a,
.manifest-open {
  display: grid;
  place-items: center;
  padding: 0 0.9rem;
  border-left: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
}

.view-switch a:first-child {
  border-left: 0;
}

.view-switch a[aria-current="page"] {
  background: var(--accent);
  color: var(--ink);
}

.view-switch a:hover,
.manifest-open:hover {
  background: var(--panel-raised);
  color: var(--ink);
}

.manifest-open {
  border-top: 0;
  border-right: 0;
  border-bottom: 0;
}

.lesson-content {
  min-height: calc(100svh - 4.25rem);
  padding-bottom: 16rem;
  overflow: hidden;
}

.lesson-hero {
  display: grid;
  min-height: 34rem;
  grid-template-columns: minmax(0, 1.45fr) minmax(20rem, 0.65fr);
  border-bottom: 1px solid var(--line-strong);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(2.5rem, 6vw, 6rem) clamp(1.25rem, 6vw, 6rem);
}

.eyebrow {
  margin-bottom: 1.2rem;
  color: var(--accent-strong);
  font: 700 0.7rem var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.lesson-hero h1 {
  max-width: 10ch;
  margin: 0;
  font: 700 clamp(4rem, 9vw, 9rem)/0.76 var(--font-display);
  letter-spacing: -0.078em;
  text-transform: uppercase;
  view-transition-name: lesson-title;
}

.deck {
  max-width: 48rem;
  margin: 2rem 0 0;
  color: var(--dim);
  font-size: clamp(1.25rem, 2.4vw, 2.2rem);
  line-height: 1.08;
}

.artifact-band {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: flex-end;
  padding: clamp(1.5rem, 3vw, 3rem);
  background: var(--surface);
  color: var(--on-surface);
}

.artifact-duration {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  color: var(--dim);
  font: 600 0.62rem var(--font-mono);
  letter-spacing: 0.12em;
  text-align: right;
  text-transform: uppercase;
}

.artifact-duration strong {
  display: block;
  color: var(--ink);
  font: 500 4.8rem/0.8 var(--font-display);
  letter-spacing: -0.07em;
}

.artifact-label {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line-strong);
  font: 600 0.65rem var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.artifact-band pre {
  max-width: 100%;
  margin: 1rem 0 0;
  overflow: auto;
}

.artifact-band code {
  color: var(--ink);
  font: 0.76rem/1.7 var(--code-font);
  white-space: pre-wrap;
}

.reading-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding: clamp(2.5rem, 6vw, 6rem);
  border-bottom: 1px solid var(--line-strong);
}

.reading-copy {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.reading-copy p {
  margin: 0;
  color: var(--dim);
  font-size: 1.06rem;
}

.reading-copy p:first-child {
  grid-column: 1 / 3;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 1.22rem;
}

.reading-grid blockquote {
  align-self: center;
  margin: 0;
  padding-left: 1.3rem;
  border-left: 0.5rem solid var(--accent-strong);
  font: 600 clamp(2rem, 4vw, 4rem)/0.96 var(--font-display);
  letter-spacing: -0.052em;
}

.flow-checks {
  padding: 0 clamp(1.25rem, 6vw, 6rem) clamp(3rem, 6vw, 6rem);
}

.flow-checks > header {
  display: flex;
  min-height: 3.5rem;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font: 600 0.68rem var(--font-mono);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.flow-check-row {
  display: grid;
  min-height: 4.25rem;
  grid-template-columns: 4rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  border-top: 1px solid var(--line);
}

.flow-check-row:last-child {
  border-bottom: 1px solid var(--line);
}

.flow-check-row > span,
.flow-check-row > em {
  color: var(--muted);
  font: 600 0.68rem var(--font-mono);
  font-style: normal;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.flow-check-row > em {
  color: var(--accent-strong);
}

.flow-check-row strong {
  font: 600 1.1rem var(--font-display);
}

.curriculum-transport {
  position: fixed;
  z-index: 30;
  inset: auto 0 0;
  display: grid;
  height: 15rem;
  grid-template-rows: 2.1rem minmax(0, 1fr) 3.2rem;
  border-top: 1px solid var(--line-strong);
  background: var(--canvas);
  user-select: none;
}

.phase-scale {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr) auto;
  align-items: stretch;
  border-bottom: 1px solid var(--line-strong);
}

.phase-scale > strong,
.phase-scale > span {
  display: grid;
  place-items: center start;
  padding: 0 0.9rem;
  color: var(--muted);
  font: 600 0.58rem var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.phase-scale > span {
  place-items: center end;
}

.phase-bars {
  display: flex;
  min-width: 0;
}

.phase-bar {
  min-width: 1.5rem;
  border-left: 1px solid var(--line-strong);
  color: transparent;
  font-size: 0;
}

.phase-bar.is-complete {
  background: var(--accent-through);
}

.phase-bar.is-current {
  background: var(--accent);
}

.phase-bar.is-sealed {
  border-color: var(--quiet);
}

.track-window {
  position: relative;
  overflow: hidden;
  touch-action: pan-y;
  cursor: grab;
}

.track-window.is-dragging {
  cursor: grabbing;
}

.lesson-track {
  position: absolute;
  top: 0;
  left: 50%;
  display: flex;
  height: 100%;
  will-change: transform;
  transition: transform 340ms cubic-bezier(0.22, 1, 0.36, 1);
}

.track-window.is-dragging .lesson-track {
  transition: none;
}

.lesson-clip {
  position: relative;
  display: grid;
  min-width: var(--clip-width);
  max-width: var(--clip-width);
  grid-template-rows: auto 1fr auto;
  padding: 0.85rem;
  overflow: hidden;
  border-right: 1px solid var(--line-strong);
  background: var(--canvas);
  text-align: left;
}

.lesson-clip:first-child {
  border-left: 1px solid var(--line-strong);
}

.lesson-clip small,
.lesson-clip span {
  color: var(--muted);
  font: 600 0.58rem var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-clip strong {
  z-index: 1;
  align-self: center;
  max-width: 12rem;
  font: 650 clamp(1rem, 1.8vw, 1.45rem)/0.98 var(--font-display);
  letter-spacing: -0.035em;
}

.lesson-clip-index {
  position: absolute;
  z-index: 0;
  top: 0.3rem;
  right: 0.5rem;
  color: color-mix(in srgb, var(--ink) 12%, var(--canvas));
  font: 600 3.3rem/1 var(--font-display);
  letter-spacing: -0.08em;
}

.lesson-clip.is-complete {
  background: var(--accent-wash);
}

.lesson-clip.is-current {
  background: var(--accent);
  color: var(--ink);
}

.lesson-clip.is-current small,
.lesson-clip.is-current span {
  color: var(--ink);
}

.lesson-clip.is-next {
  border-color: var(--accent-strong);
}

.lesson-clip:hover:not(.is-current) {
  background: var(--panel-raised);
}

.fixed-playhead {
  position: absolute;
  z-index: 4;
  top: 2.1rem;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--quiet);
  pointer-events: none;
}

.fixed-playhead::after {
  position: absolute;
  top: 1.1rem;
  left: -0.35rem;
  width: 0.7rem;
  height: 0.7rem;
  content: "";
  background: var(--quiet);
  clip-path: circle(50%);
}

.fixed-playhead span {
  position: absolute;
  top: 0.2rem;
  left: 0.55rem;
  color: var(--quiet-strong);
  font: 700 0.54rem var(--font-mono);
  letter-spacing: 0.12em;
  white-space: nowrap;
  text-transform: uppercase;
}

.transport-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto;
  border-top: 1px solid var(--line-strong);
}

.transport-step,
.flow-complete,
.transport-map {
  min-width: 0;
  padding: 0 1rem;
  border-right: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.transport-step {
  display: grid;
  grid-template-columns: auto 4rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: center;
  text-align: left;
}

.transport-step.next {
  grid-template-columns: 4rem minmax(0, 1fr) auto;
  text-align: right;
}

.transport-step span,
.flow-complete span {
  color: var(--muted);
  font-size: 0.55rem;
  letter-spacing: 0.1em;
}

.transport-step strong,
.flow-complete strong {
  overflow: hidden;
  font-size: 0.68rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.transport-step:hover,
.transport-map:hover {
  background: var(--panel-raised);
  color: var(--ink);
}

.flow-complete {
  min-width: 13rem;
  background: var(--accent);
  color: var(--ink);
}

.flow-complete span,
.flow-complete strong {
  display: block;
}

.flow-complete:hover {
  background: var(--accent-strong);
  color: var(--canvas);
}

.transport-map {
  border-right: 0;
  font-size: 0.58rem;
  letter-spacing: 0.08em;
}

.course-manifest {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  grid-template-rows: auto 1fr;
  background: var(--canvas);
  opacity: 0;
  pointer-events: none;
  transform: translateY(100%);
  visibility: hidden;
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1), opacity 180ms ease;
}

.course-manifest.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: none;
  visibility: visible;
}

.manifest-mast {
  display: flex;
  min-height: 5rem;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--line-strong);
}

.manifest-mast span,
.manifest-mast button {
  color: var(--muted);
  font: 600 0.65rem var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.manifest-mast h2 {
  margin: 0.2rem 0 0;
  font: 650 1.7rem/1 var(--font-display);
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.manifest-mast button {
  align-self: stretch;
  padding: 0 1.5rem;
  border-left: 1px solid var(--line-strong);
}

.manifest-list {
  overflow: auto;
}

.manifest-phase {
  display: grid;
  grid-template-columns: minmax(10rem, 0.28fr) 1fr;
  border-bottom: 1px solid var(--line-strong);
}

.manifest-phase > h3 {
  margin: 0;
  padding: 1.5rem;
  color: var(--muted);
  font: 600 0.75rem/1.4 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.manifest-module {
  display: grid;
  grid-template-columns: 4rem minmax(12rem, 0.65fr) 1fr auto;
  gap: 1rem;
  align-items: center;
  min-height: 6rem;
  padding: 0 1.5rem;
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.manifest-module.is-current {
  background: var(--accent);
}

.manifest-module-number,
.manifest-module-meta {
  color: var(--muted);
  font: 600 0.65rem var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.manifest-module-title {
  font: 650 clamp(1.4rem, 2.8vw, 2.8rem)/0.95 var(--font-display);
  letter-spacing: -0.045em;
}

.manifest-lessons {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.manifest-lesson {
  padding: 0.55rem 0.75rem;
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.78rem;
  text-align: left;
}

.manifest-lesson[aria-current="step"] {
  background: var(--accent);
  color: var(--ink);
}

.manifest-lesson[aria-disabled="true"],
.manifest-module-meta.is-sealed {
  color: var(--quiet-strong);
}

.manifest-lesson[aria-disabled="true"] {
  cursor: not-allowed;
}

@media (max-width: 1000px) {
  .flow-mast { grid-template-columns: minmax(12rem, 1fr) auto auto; }
  .flow-location { display: none; }
  .view-switch { display: none; }
  .lesson-hero { grid-template-columns: 1fr; }
  .artifact-band { min-height: 24rem; }
  .reading-grid { grid-template-columns: 1fr; }
  .phase-scale { grid-template-columns: 6.5rem minmax(0, 1fr); }
  .phase-scale > span { display: none; }
  .transport-map { display: none; }
  .transport-controls { grid-template-columns: 1fr auto 1fr; }
  .manifest-module { grid-template-columns: 3rem 1fr auto; }
  .manifest-lessons { grid-column: 2 / 4; }
}

@media (max-width: 650px) {
  .flow-mast { min-height: 3.5rem; grid-template-columns: 1fr auto; }
  .flow-brand { padding-inline: 0.8rem; }
  .flow-logo { width: 1.45rem; height: 1.45rem; }
  .manifest-open { padding-inline: 0.75rem; }
  .lesson-content { padding-bottom: 14.25rem; }
  .lesson-hero { min-height: 0; }
  .hero-copy { min-height: 31rem; padding: 2rem 1rem; }
  .lesson-hero h1 { font-size: clamp(3.7rem, 18vw, 6rem); }
  .artifact-band { min-height: 21rem; padding: 1rem; }
  .reading-grid { padding: 2.5rem 1rem; }
  .reading-copy { grid-template-columns: 1fr; }
  .reading-copy p:first-child { grid-column: 1; }
  .flow-checks { padding-inline: 1rem; }
  .flow-check-row { grid-template-columns: 2.5rem 1fr; }
  .flow-check-row > em { grid-column: 2; }
  .curriculum-transport { height: 13.5rem; grid-template-rows: 1.8rem minmax(0, 1fr) 3.4rem; }
  .phase-scale { grid-template-columns: 4.7rem minmax(0, 1fr); }
  .phase-scale > strong { padding-inline: 0.45rem; font-size: 0.5rem; }
  .lesson-clip { min-width: min(10.5rem, var(--clip-width)); max-width: min(10.5rem, var(--clip-width)); padding: 0.65rem; }
  .lesson-clip strong { font-size: 0.95rem; }
  .fixed-playhead { top: 1.8rem; }
  .transport-step { grid-template-columns: auto 1fr; padding-inline: 0.6rem; }
  .transport-step.next { grid-template-columns: 1fr auto; }
  .transport-step span { display: none; }
  .transport-step strong { max-width: 5rem; font-size: 0.58rem; }
  .flow-complete { min-width: 9.5rem; padding-inline: 0.7rem; }
  .flow-complete strong { font-size: 0.58rem; white-space: normal; }
  .manifest-phase { grid-template-columns: 1fr; }
  .manifest-phase > h3 { border-bottom: 1px solid var(--line); }
  .manifest-module { grid-template-columns: 2.5rem 1fr; padding: 1rem; }
  .manifest-module-meta { grid-column: 2; }
  .manifest-lessons { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  .course-manifest { transform: none; }
}