/* Learning roadmap and about pages. */
.md-main__inner:has(.journey-page),
.md-main__inner:has(.about-page) {
  max-width: 66rem;
}

.journey-page,
.about-page {
  font-size: .8rem;
  line-height: 1.8;
}

.journey-hero,
.about-hero {
  position: relative;
  overflow: hidden;
  margin-bottom: 2.4rem;
  padding: 2.8rem;
  border: 1px solid var(--notes-border);
  border-radius: 1.35rem;
  background:
    radial-gradient(circle at 88% 12%, rgba(124, 131, 255, .2), transparent 16rem),
    linear-gradient(135deg, rgba(124, 131, 255, .09), transparent 52%),
    var(--notes-surface);
}

.about-hero {
  background:
    radial-gradient(circle at 84% 15%, rgba(51, 207, 184, .16), transparent 15rem),
    linear-gradient(135deg, rgba(124, 131, 255, .08), transparent 56%),
    var(--notes-surface);
}

.journey-page .journey-hero h1,
.about-page .about-hero h1 {
  max-width: none;
  margin: .45rem 0 1rem;
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  line-height: 1.12;
}

.journey-lead,
.about-lead {
  max-width: 43rem;
  margin: 0;
  color: var(--md-default-fg-color--light);
  font-size: clamp(.92rem, 2vw, 1.12rem);
  line-height: 1.75;
}

.journey-stats {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.5rem;
}

.journey-stats span,
.about-tags span {
  display: inline-flex;
  align-items: baseline;
  gap: .35rem;
  padding: .38rem .65rem;
  border: 1px solid var(--notes-border);
  border-radius: 999px;
  background: rgba(8, 13, 24, .28);
  color: var(--md-default-fg-color--light);
  font-size: .68rem;
}

[data-md-color-scheme="default"] .journey-stats span,
[data-md-color-scheme="default"] .about-tags span {
  background: rgba(255, 255, 255, .55);
}

.journey-stats strong {
  color: var(--md-default-fg-color);
  font-size: .85rem;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-top: 1.5rem;
}

.journey-page h2,
.about-page h2 {
  margin: 2.8rem 0 1rem;
  font-size: 1.4rem;
}

.journey-page h2::before,
.about-page h2::before {
  display: none;
}

.path-selector {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .8rem;
}

.path-choice {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--notes-border);
  border-top: 2px solid #8b93ff;
  border-radius: var(--notes-radius);
  background: var(--notes-surface);
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.path-choice--application { border-top-color: #41c7ad; }
.path-choice--engineering { border-top-color: #e09a55; }

.path-choice:hover,
.path-choice:focus-within {
  border-color: var(--md-accent-fg-color);
  background: var(--notes-surface-strong);
  transform: translateY(-2px);
}

.path-choice__number {
  color: var(--notes-kicker);
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .09em;
}

.journey-page .path-choice h3 {
  margin: .7rem 0 .45rem;
  font-size: 1.05rem;
}

.path-choice h3 a { color: var(--md-default-fg-color); }

.path-choice h3 a::after {
  position: absolute;
  inset: 0;
  border-radius: var(--notes-radius);
  content: "";
}

.path-choice p {
  flex: 1;
  margin: 0 0 1rem;
  color: var(--md-default-fg-color--light);
}

.path-choice__result {
  padding-top: .8rem;
  border-top: 1px solid var(--notes-border);
  color: var(--md-default-fg-color--light);
  font-size: .67rem;
}

.path-intro {
  max-width: 45rem;
  margin: -.4rem 0 1.2rem;
  color: var(--md-default-fg-color--light);
}

.learning-track {
  position: relative;
  display: grid;
  gap: .65rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.learning-track::before {
  position: absolute;
  top: 1.5rem;
  bottom: 1.5rem;
  left: 1.55rem;
  width: 1px;
  background: linear-gradient(#8b93ff, rgba(139, 147, 255, .08));
  content: "";
}

.learning-track--application::before { background: linear-gradient(#41c7ad, rgba(65, 199, 173, .08)); }
.learning-track--engineering::before { background: linear-gradient(#e09a55, rgba(224, 154, 85, .08)); }

.learning-track > li {
  position: relative;
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr);
  gap: .9rem;
  margin: 0;
  padding: 1.05rem 1.2rem 1.05rem 0;
  border: 1px solid var(--notes-border);
  border-radius: .9rem;
  background: var(--notes-surface);
}

.learning-track__step {
  z-index: 1;
  align-self: start;
  justify-self: center;
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  border: 1px solid rgba(139, 147, 255, .55);
  border-radius: 50%;
  background: var(--notes-surface-strong);
  color: var(--notes-kicker);
  font-size: .59rem;
  font-weight: 750;
}

.journey-page .learning-track h3 {
  margin: 0 0 .25rem;
  font-size: .94rem;
}

.learning-track p {
  margin: 0 0 .45rem;
  color: var(--md-default-fg-color--light);
}

.learning-track a {
  position: relative;
  z-index: 2;
  display: inline-block;
  margin: .15rem .85rem .1rem 0;
  font-size: .72rem;
  font-weight: 650;
}

.theory-grid,
.about-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
}

.theory-grid a,
.about-map a,
.about-starts a {
  display: grid;
  gap: .28rem;
  min-width: 0;
  padding: 1.05rem 1.15rem;
  border: 1px solid var(--notes-border);
  border-radius: .8rem;
  background: var(--notes-surface);
  color: var(--md-default-fg-color);
  transition: border-color 160ms ease, background 160ms ease;
}

.theory-grid a:hover,
.theory-grid a:focus-visible,
.about-map a:hover,
.about-map a:focus-visible,
.about-starts a:hover,
.about-starts a:focus-visible {
  border-color: var(--md-accent-fg-color);
  background: var(--notes-surface-strong);
}

.theory-grid span,
.about-map span,
.about-starts span {
  color: var(--notes-kicker);
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.theory-grid strong,
.about-map strong,
.about-starts strong { font-size: .84rem; }

.theory-grid small,
.about-map small {
  color: var(--md-default-fg-color--light);
  font-size: .68rem;
  line-height: 1.6;
}

.journey-note {
  margin: 2rem 0 0;
  padding: 1.1rem 1.25rem;
  border: 1px solid rgba(124, 131, 255, .28);
  border-left: 3px solid var(--md-accent-fg-color);
  border-radius: .75rem;
  background: linear-gradient(90deg, rgba(124, 131, 255, .08), transparent), var(--notes-surface);
}

.journey-note strong { color: var(--md-default-fg-color); }
.journey-note p { margin: .25rem 0 0; color: var(--md-default-fg-color--light); }

.journey-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin: 1.3rem 0 0;
}

.journey-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.35rem;
  padding: .5rem 1rem;
  border: 1px solid var(--notes-border);
  border-radius: .55rem;
  background: var(--notes-surface);
  color: var(--md-default-fg-color) !important;
  font-size: .72rem;
  font-weight: 700;
}

.journey-button--primary {
  border-color: #a6adff;
  background: #a6adff;
  color: #111827 !important;
}

[data-md-color-scheme="default"] .journey-button--primary {
  border-color: #565fde;
  background: #565fde;
  color: #fff !important;
}

.journey-button:hover,
.journey-button:focus-visible { border-color: var(--md-accent-fg-color); }

.about-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
}

.about-principles article {
  padding: 1.2rem;
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
  background: var(--notes-surface);
}

.about-principles span {
  color: #55cbb5;
  font-size: .63rem;
  font-weight: 750;
  letter-spacing: .08em;
}

.about-page .about-principles h3 {
  margin: .65rem 0 .4rem;
  font-size: .94rem;
}

.about-principles p { margin: 0; color: var(--md-default-fg-color--light); }

.about-method {
  padding: 1.1rem 1.35rem;
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
  background: var(--notes-surface);
}

.about-method ol { margin: 0; padding-left: 1.2rem; }
.about-method li { padding-left: .35rem; }
.about-method li::marker { color: var(--notes-kicker); font-weight: 750; }

.about-starts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .7rem;
}

.journey-page a:focus-visible,
.about-page a:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 3px;
}

@media (max-width: 60em) {
  .journey-hero,
  .about-hero { padding: 2rem; }
  .path-selector,
  .about-principles { grid-template-columns: 1fr; }
  .about-starts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 40em) {
  .journey-hero,
  .about-hero { padding: 1.25rem; border-radius: 1rem; }
  .theory-grid,
  .about-map,
  .about-starts { grid-template-columns: 1fr; }
  .learning-track > li { grid-template-columns: 2.65rem minmax(0, 1fr); padding-right: .8rem; }
  .learning-track::before { left: 1.32rem; }
  .journey-actions { display: grid; grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .journey-page *,
  .about-page * { transition: none !important; }
}