.ac-head [hidden],
.ac-main [hidden] {
  display: none !important;
}

.ac-head__in {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 32px;
  align-items: end;
}

.ac-meter .panel__body {
  padding: 18px;
}

.ac-meter__text {
  margin: 0;
  font-size: .82rem;
  color: var(--text-2);
}

.ac-bar {
  position: relative;
  height: 10px;
  background: rgba(0, 0, 0, .35);
  border: 1px solid var(--line-2);
  overflow: hidden;
}

.ac-bar i {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: repeating-linear-gradient(135deg, var(--signal) 0 8px, var(--signal-2) 8px 16px);
  box-shadow: 0 0 12px rgba(255, 138, 31, .5);
  transition: width .6s var(--ease);
}

.ac-bar--thin {
  height: 6px;
  max-width: 520px;
}

.ac-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
}

.ac-chapter__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 22px;
  align-items: start;
  margin-bottom: 16px;
}

.ac-chapter__head h2 {
  margin: 0 0 4px;
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
}

.ac-chapter__head .eyebrow {
  margin-bottom: 6px;
}

.ac-chapter__head p {
  margin: 0;
}

.ac-chapter__no {
  font-size: 3rem;
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-3);
  user-select: none;
}

.ac-chapter.is-done .ac-chapter__no {
  -webkit-text-stroke: 1px var(--signal);
}

.ac-lessons {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ac-lesson {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 14px 18px;
  color: var(--text);
  text-decoration: none !important;
  transition: transform .2s var(--ease), border-color .2s;
}

.ac-lesson:hover {
  color: var(--text);
  transform: translateX(4px);
  border-color: var(--line-2);
}

.ac-lesson__no {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-3);
  color: var(--signal-2);
  font-size: .95rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.ac-lesson.is-done .ac-lesson__no {
  background: var(--signal);
  border-color: var(--signal);
  color: #160a00;
}

.ac-lesson__body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.ac-lesson__title {
  font-weight: 650;
}

.ac-lesson__text {
  font-size: .9rem;
  color: var(--text-2);
}

.ac-lesson__meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ac-lesson__min {
  font-size: .72rem;
  color: var(--muted);
  white-space: nowrap;
}

.ac-lesson__done {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  color: transparent;
}

.ac-lesson.is-done .ac-lesson__done {
  border-color: var(--ok);
  color: var(--ok);
  box-shadow: 0 0 10px rgba(95, 224, 138, .35);
}

.ac-side .panel__body {
  padding: 18px;
}

.ac-badges {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
  gap: 14px 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ac-badge {
  display: grid;
  justify-items: center;
  gap: 6px;
  text-align: center;
}

.ac-badge__hex {
  display: grid;
  place-items: center;
  width: 58px;
  height: 64px;
  background: var(--panel-3);
  color: var(--line-3);
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  transition: background .4s, color .4s, filter .4s;
}

.ac-badge__hex .icon {
  width: 26px;
  height: 26px;
}

.ac-badge__name {
  max-width: 100%;
  font: .6rem/1.3 var(--font-mono);
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--muted);
  overflow-wrap: anywhere;
  hyphens: auto;
}

.ac-badge.is-earned .ac-badge__hex {
  background: linear-gradient(160deg, var(--signal-2), var(--signal) 55%, #b85a08);
  color: #160a00;
  filter: drop-shadow(0 0 10px rgba(255, 138, 31, .45));
}

.ac-badge.is-earned .ac-badge__name {
  color: var(--signal-2);
}

.ac-reset {
  justify-self: start;
}

.ac-lesson-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.ac-main {
  min-width: 0;
}

.ac-prose {
  max-width: 78ch;
}

.ac-figure {
  margin: 0;
}

.ac-figure__body {
  padding: 18px 18px 6px;
  background: radial-gradient(600px 260px at 50% 40%, rgba(63, 213, 196, .05), transparent 70%);
}

.ac-figure__cap {
  padding: 10px 20px 16px;
  color: var(--text-2);
  font-size: .9rem;
}

.ac-ex {
  scroll-margin-top: calc(var(--topbar) + 16px);
}

.ac-ex [hidden] {
  display: none !important;
}

.ac-ex.is-passed {
  animation: ac-pass 1.4s var(--ease);
}

@keyframes ac-pass {
  0% {
    box-shadow: 0 0 0 0 rgba(95, 224, 138, .6);
  }
  40% {
    box-shadow: 0 0 0 6px rgba(95, 224, 138, .25), 0 0 40px rgba(95, 224, 138, .25);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(95, 224, 138, 0);
  }
}

.ac-ex__status {
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.ac-ex__task .prose {
  font-size: .98rem;
}

.ac-ex__editor {
  --ic-lh: 21px;
  --ic-fs: 13.5px;
  --ic-pad-y: 10px;
  --ic-pad-x: 14px;
  display: flex;
  height: clamp(280px, 44vh, 440px);
  border: 1px solid var(--line-2);
}

.ac-ex__saved {
  margin-left: auto;
  font-size: .76rem;
}

.ac-findings {
  margin-top: -6px;
}

.ac-findings__ok {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: var(--ok);
}

.ac-findings__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ac-finding {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 8px;
  width: 100%;
  padding: 5px 6px;
  background: rgba(0, 0, 0, .2);
  border: 0;
  border-left: 2px solid var(--warn);
  color: var(--text-2);
  font: .86rem/1.45 var(--font-body);
  text-align: left;
  cursor: pointer;
}

.ac-finding--error {
  border-left-color: var(--err);
}

.ac-finding .tag {
  height: 20px;
  padding: 0 6px;
  font-size: .6rem;
}

.ac-finding__line {
  font-size: .72rem;
  color: var(--muted);
  white-space: nowrap;
}

.ac-hints {
  display: grid;
  gap: 6px;
}

.ac-hints .eyebrow {
  margin-bottom: 2px;
}

.ac-hint {
  background: rgba(0, 0, 0, .2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--hazard);
}

.ac-hint summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  list-style: none;
  cursor: pointer;
  font: .76rem var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--hazard);
}

.ac-hint summary::-webkit-details-marker {
  display: none;
}

.ac-hint .prose {
  padding: 0 14px 10px;
}

.ac-hint .prose p:last-child {
  margin-bottom: 0;
}

.ac-solution__box {
  display: grid;
  gap: 8px;
  padding: 14px;
  background: rgba(63, 213, 196, .04);
  border: 1px solid rgba(63, 213, 196, .3);
}

.ac-solution__box .eyebrow {
  margin: 0;
}

.ac-solution__code {
  margin: 0;
  font-size: .8rem;
}

.ac-solution__box .btn {
  justify-self: start;
}

.ac-results:empty {
  display: none;
}

.ac-results {
  display: grid;
  gap: 10px;
}

.ac-results > .eyebrow {
  margin: 4px 0 0;
}

.ac-results .alert {
  margin: 0;
}

.ac-checks,
.ac-tests {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ac-checks li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 6px 10px;
  background: rgba(255, 90, 79, .06);
  border-left: 2px solid var(--err);
  font-size: .92rem;
}

.ac-checks .icon {
  color: var(--err);
  flex: none;
}

.ac-test {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 4px 10px;
  align-items: center;
  padding: 9px 12px;
  background: rgba(0, 0, 0, .25);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-3);
}

.ac-test.is-pass {
  border-left-color: var(--ok);
}

.ac-test.is-fail {
  border-left-color: var(--err);
}

.ac-test__icon {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
}

.ac-test.is-pass .ac-test__icon {
  color: var(--ok);
}

.ac-test.is-fail .ac-test__icon {
  color: var(--err);
}

.ac-test__name {
  font-weight: 600;
  font-size: .94rem;
}

.ac-test__state {
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.ac-test__detail {
  grid-column: 2 / -1;
  display: grid;
  gap: 4px;
}

.ac-test__msg {
  margin: 0;
  color: #ffb3ac;
  font-size: .92rem;
}

.ac-test__ctx {
  margin: 0;
}

.ac-snapbox summary {
  cursor: pointer;
  font: .68rem var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.ac-snapbox .eyebrow {
  margin: 8px 0 4px;
  font-size: .62rem;
}

.ac-snap {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .8rem;
}

.ac-snap li {
  display: grid;
  grid-template-columns: minmax(110px, auto) 1fr;
  gap: 10px;
}

.ac-snap__k {
  color: var(--text-2);
}

.ac-snap .mono,
.ac-snap__regs {
  color: var(--cyan);
  overflow-wrap: anywhere;
  margin: 0;
}

.ac-pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

.ac-pager .btn {
  white-space: normal;
  text-align: left;
  min-height: 48px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.ac-pager [data-ac-next].is-ready {
  animation: ac-next 1.6s var(--ease) 2;
}

@keyframes ac-next {
  50% {
    box-shadow: 0 0 0 4px rgba(255, 138, 31, .35), 0 0 30px rgba(255, 138, 31, .4);
  }
}

.ac-toc__panel {
  position: sticky;
  top: calc(var(--topbar) + 20px);
  max-height: calc(100vh - var(--topbar) - 40px);
  display: flex;
  flex-direction: column;
}

.ac-toc__body {
  padding: 12px 14px 16px;
  overflow-y: auto;
  scrollbar-width: thin;
}

.ac-toc__chapter {
  margin: 12px 0 4px;
  font-size: .64rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.ac-toc__chapter:first-child {
  margin-top: 0;
}

.ac-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.ac-toc__list a {
  display: grid;
  grid-template-columns: 22px 1fr auto;
  gap: 6px;
  align-items: baseline;
  padding: 4px 6px;
  border-left: 1px solid var(--line);
  color: var(--text-2);
  font-size: .86rem;
  line-height: 1.35;
  text-decoration: none !important;
}

.ac-toc__list a:hover {
  color: var(--text);
  border-left-color: var(--line-3);
}

.ac-toc__list a[aria-current="page"] {
  color: var(--signal-2);
  border-left: 2px solid var(--signal);
  background: var(--signal-dim);
}

.ac-toc__no {
  font-size: .72rem;
  color: var(--muted);
}

.ac-toc__check {
  width: 13px;
  height: 13px;
  color: transparent;
}

.ac-toc__list a.is-done .ac-toc__check {
  color: var(--ok);
}

.ac-toc__links {
  display: grid;
  gap: 8px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.ac-gloss {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.ac-terms {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 10px;
  margin: 0;
}

.ac-term {
  padding: 14px 16px;
}

.ac-term dt {
  font: 600 .95rem var(--font-mono);
  color: var(--signal-2);
}

.ac-term dd {
  margin: 4px 0 0;
  color: var(--text-2);
  font-size: .9rem;
}

.ac-term dd p {
  margin: 0 0 6px;
}

.ac-gloss__cat {
  margin: 22px 0 8px;
  font: .78rem var(--font-mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.ac-ops__syn {
  white-space: nowrap;
  font-size: .84rem;
  color: var(--text-2);
}

.dg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
}

.dg-box {
  fill: #0b1016;
  stroke: var(--line-3);
  stroke-width: 1.2;
}

.dg-box--acc {
  stroke: var(--signal);
}

.dg-box--cyan {
  stroke: var(--cyan);
}

.dg-box--ok {
  stroke: var(--ok);
}

.dg-box--err {
  stroke: var(--err);
}

.dg-chip {
  fill: #160c03;
  stroke: var(--signal);
  stroke-width: 1.5;
}

.dg-pin {
  fill: var(--panel-3);
  stroke: var(--signal-2);
  stroke-width: 1.2;
}

.dg-line {
  fill: none;
  stroke: var(--line-3);
  stroke-width: 1.4;
}

.dg-line--acc {
  stroke: var(--signal);
}

.dg-line--cyan {
  stroke: var(--cyan);
}

.dg-line--dash {
  stroke-dasharray: 5 4;
}

.dg-head {
  fill: var(--text-2);
}

.dg-t {
  fill: var(--text-2);
  font: 13px var(--font-body);
}

.dg-k {
  fill: var(--text);
  font: 600 13px var(--font-body);
}

.dg-m {
  fill: var(--text);
  font: 13px var(--font-mono);
}

.dg-s {
  fill: var(--muted);
  font: 11.5px var(--font-body);
}

.dg-big {
  font-size: 26px;
}

.dg-acc { fill: var(--signal-2); }
.dg-cyan { fill: var(--cyan); }
.dg-err { fill: #ff8a80; }
.dg-ok { fill: var(--ok); }
.dg-reg { fill: #6ed8ff; }
.dg-op { fill: #ff9f4a; }
.dg-lt { fill: #4ee0cc; }
.dg-num { fill: #8fe3a5; }
.dg-str { fill: #f2d06b; }
.dg-com { fill: #6b7886; font-style: italic; }
.dg-lbl { fill: #ff7ab3; }
.dg-def { fill: #ffd59c; }
.dg-ali { fill: #9fdcff; font-style: italic; }

.dg-fill--cyan { fill: rgba(63, 213, 196, .35); }
.dg-fill--acc { fill: rgba(255, 138, 31, .55); }
.dg-fill--err { fill: rgba(255, 90, 79, .55); }
.dg-fill--ok { fill: rgba(95, 224, 138, .5); }
.dg-fill--warn { fill: rgba(245, 197, 24, .55); }

.dg-band {
  fill: rgba(255, 255, 255, .03);
}

.dg-curve {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2.2;
  stroke-linejoin: round;
}

.dg-curve--acc {
  stroke: var(--signal);
}

.dg-zone--base {
  fill: rgba(95, 224, 138, .07);
  stroke: rgba(95, 224, 138, .35);
}

.dg-zone--space {
  fill: rgba(90, 169, 255, .05);
  stroke: rgba(90, 169, 255, .3);
  stroke-dasharray: 4 4;
}

.dg-door {
  fill: var(--panel-3);
  stroke: var(--hazard);
  stroke-width: 1.4;
}

@media (max-width: 1100px) {
  .ac-head__in,
  .ac-overview,
  .ac-lesson-grid,
  .ac-gloss {
    grid-template-columns: minmax(0, 1fr);
  }

  .ac-toc__panel {
    position: static;
    max-height: none;
  }

  .ac-meter {
    max-width: 520px;
  }
}

@media (max-width: 640px) {
  .ac-lesson {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 12px 14px;
  }

  .ac-lesson__meta {
    grid-column: 2;
  }

  .ac-chapter__no {
    font-size: 2.2rem;
  }

  .ac-ex__editor {
    --ic-fs: 13px;
    --ic-lh: 20px;
    --ic-pad-x: 10px;
    height: 340px;
  }

  .ac-ex__saved {
    display: none;
  }

  .ac-figure__body {
    overflow-x: auto;
    padding: 12px 12px 4px;
  }

  .ac-figure__body .dg {
    min-width: 560px;
  }

  .ac-ops__syn {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ac-ex.is-passed,
  .ac-pager [data-ac-next].is-ready {
    animation: none;
  }
}