.page-about {
  background: var(--color-surface);
}

.page-about__crumb {
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 1.25rem 1.5rem 0;
  font-size: 0.85rem;
  color: var(--color-primary);
}

.page-about__brand {
  display: grid;
  grid-template-columns: 1fr;
}

.page-about__brand-rail {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: 2.25rem 1.5rem 2.5rem;
  position: relative;
  overflow: hidden;
}

.page-about__brand-rail::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-lime), var(--color-accent));
}

.page-about__brand-rail::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -30px;
  width: 180px;
  height: 180px;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 8px,
    var(--color-lime) 8px 9px,
    transparent 9px 18px
  );
  opacity: 0.14;
  pointer-events: none;
}

.page-about__brand-rail > * {
  position: relative;
  z-index: 1;
}

.page-about__brand-rail .chapter-label {
  color: var(--color-lime);
  font-family: var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.82rem;
  margin-bottom: 0.75rem;
}

.page-about__brand-rail h1 {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.7rem, 5vw, 2.8rem);
  line-height: 1.08;
  margin: 0 0 1.1rem;
  color: #ffffff;
}

.page-about__brand-lead {
  font-size: 1.05rem;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 1rem;
}

.page-about__brand-desc {
  font-size: 0.95rem;
  line-height: 1.66;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 1.5rem;
}

.page-about__badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.6rem;
}

.page-about__badge {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.8rem;
  background: rgba(255, 255, 255, 0.08);
  border-left: 3px solid var(--color-lime);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #ffffff;
  white-space: nowrap;
}

.page-about__brand-img {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__journey {
  padding: 2.25rem 1.5rem 2.75rem;
  background: var(--color-surface);
}

.page-about__journey-head {
  margin-bottom: 1.85rem;
}

.page-about__journey-head .section-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-about__journey-head h2 {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 2rem);
  color: var(--color-primary);
  line-height: 1.22;
  margin: 0;
}

.page-about__timeline {
  position: relative;
  padding-left: 1.4rem;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary) 0%, var(--color-accent) 58%, var(--color-lime) 100%);
}

.page-about__tl-item {
  position: relative;
  margin-bottom: 0.9rem;
}

.page-about__tl-summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.85rem;
  padding: 0.85rem 1rem;
  background: #ffffff;
  border: 1px solid var(--color-surface-alt);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.page-about__tl-summary::-webkit-details-marker {
  display: none;
}

.page-about__tl-summary:hover,
.page-about__tl-item[open] .page-about__tl-summary {
  border-color: var(--color-accent);
  box-shadow: 0 2px 10px rgba(10, 27, 61, 0.08);
}

.page-about__tl-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #ffffff;
  box-shadow: 0 0 0 2px var(--color-primary);
  flex-shrink: 0;
}

.page-about__tl-item.is-highlight .page-about__tl-dot {
  background: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.page-about__tl-version {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-about__tl-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.page-about__tl-badge {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  background: var(--color-accent);
  color: #ffffff;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  text-transform: uppercase;
  white-space: nowrap;
}

.page-about__tl-body {
  background: #ffffff;
  border-left: 3px solid var(--color-accent);
  padding: 0.9rem 1rem;
  margin: 0.35rem 0 0 0.35rem;
  font-size: 0.9rem;
  line-height: 1.66;
  color: var(--color-text);
}

.page-about__tl-body p {
  margin: 0;
}

.page-about__journey-foot {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.6rem;
}

.page-about__link-arrow {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color 150ms ease, color 150ms ease;
  align-self: flex-start;
}

.page-about__link-arrow:hover {
  border-color: var(--color-accent);
}

.page-about__tech {
  padding: 3rem 1.5rem;
  background: #ffffff;
}

.page-about__tech-head {
  max-width: 760px;
}

.page-about__tech-head .section-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-about__tech-head h2 {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 2.2rem);
  color: var(--color-primary);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.page-about__tech-head > p {
  color: var(--color-text);
  font-size: 0.98rem;
  line-height: 1.66;
  margin: 0;
}

.page-about__tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.page-about__tech-card {
  background: var(--color-surface);
  border-top: 4px solid var(--color-primary);
  padding: 1.5rem 1.25rem 1.35rem;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.page-about__tech-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(10, 27, 61, 0.1);
}

.page-about__tech-icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin-bottom: 0.9rem;
}

.page-about__tech-icon svg {
  width: 100%;
  height: 100%;
}

.page-about__tech-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--color-primary);
  margin: 0 0 0.6rem;
}

.page-about__tech-card p {
  font-size: 0.9rem;
  line-height: 1.66;
  color: var(--color-text);
  margin-bottom: 0.85rem;
}

.page-about__tech-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
}

.page-about__tech-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
}

.page-about__tech-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 2px;
  background: var(--color-accent);
}

.page-about__tech-figure {
  margin: 2rem 0 0;
  padding: 1.25rem;
  background: var(--color-surface-alt);
  border-left: 4px solid var(--color-lime);
}

.page-about__tech-figure img {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  border-radius: 4px;
}

.page-about__tech-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-primary);
  margin-top: 0.75rem;
}

.page-about__stats {
  background: var(--color-primary);
  padding: 3rem 1.5rem 3.25rem;
}

.page-about__stats-inner {
  max-width: var(--container-width);
  margin-inline: auto;
}

.page-about__stats-head .section-label {
  color: var(--color-lime);
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-about__stats-head h2 {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 2.2rem);
  color: #ffffff;
  line-height: 1.2;
  margin: 0 0 1.6rem;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}

.page-about__stat-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 1.25rem 1rem;
}

.page-about__stat-card .data-card-label {
  display: block;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.82rem;
  margin-bottom: 0.4rem;
}

.page-about__stat-card .data-card-value {
  display: block;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1.1;
}

.page-about__stat-note {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.62);
  line-height: 1.45;
}

.page-about__stat-hover {
  display: none;
  margin-top: 0.45rem;
  font-size: 0.78rem;
  color: var(--color-lime);
  line-height: 1.45;
}

@media (hover: hover) {
  .page-about__stat-card:hover {
    border-color: var(--color-accent);
  }

  .page-about__stat-card:hover .page-about__stat-note {
    display: none;
  }

  .page-about__stat-card:hover .page-about__stat-hover {
    display: block;
  }
}

.page-about__stats-media {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: center;
}

.page-about__stats-media img {
  display: block;
  width: 100%;
  max-width: 450px;
  height: auto;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.page-about__stats-caption {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
  line-height: 1.65;
  border-left: 3px solid var(--color-lime);
  padding-left: 1rem;
}

.page-about__stats-caption p {
  margin: 0.3rem 0;
}

.page-about__support {
  padding: 3rem 1.5rem;
  background: var(--color-surface-alt);
}

.page-about__support-copy .section-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-about__support-copy h2 {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 2rem);
  color: var(--color-primary);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.page-about__support-lead {
  font-size: 0.98rem;
  line-height: 1.66;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.page-about__support-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}

.page-about__support-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.page-about__support-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about__support-contacts {
  background: #ffffff;
  padding: 1.25rem 1.35rem;
  border-radius: 4px;
  border-left: 4px solid var(--color-accent);
  margin-bottom: 1.5rem;
}

.page-about__support-contacts p {
  margin: 0.65rem 0;
  font-size: 0.9rem;
  color: var(--color-text);
  word-break: break-word;
}

.page-about__contact-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.page-about__support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.page-about__support-btn {
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
}

.page-about__support-aside {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-top: 2rem;
}

.page-about__support-card {
  background: var(--color-primary);
  padding: 1.25rem 0.75rem;
  text-align: center;
  color: #ffffff;
  transition: background 150ms ease, transform 150ms ease;
}

.page-about__support-card:hover {
  background: var(--color-primary-light);
  transform: translateY(-3px);
}

.page-about__support-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-accent);
  line-height: 1.2;
}

.page-about__support-card p {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.78);
  margin: 0.35rem 0 0;
  line-height: 1.45;
}

@media (min-width: 768px) {
  .page-about__brand {
    grid-template-columns: 5fr 7fr;
  }

  .page-about__brand-rail {
    padding: 3.5rem 2.5rem;
  }

  .page-about__journey {
    padding: 3.5rem 2.5rem;
  }

  .page-about__journey-head h2 {
    font-size: clamp(1.4rem, 2.5vw, 2rem);
  }

  .page-about__tech {
    padding: 3.75rem 2rem;
  }

  .page-about__tech-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about__stats {
    padding: 3.75rem 2rem;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__stats-media {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__support {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 2.5rem;
    align-items: start;
    padding: 3.75rem 2rem;
  }

  .page-about__support-aside {
    grid-template-columns: 1fr;
    margin-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about__tech {
    padding: 4.5rem 2.5rem;
  }

  .page-about__stats {
    padding: 4.5rem 2.5rem;
  }

  .page-about__support {
    padding: 4.5rem 2.5rem;
  }

  .page-about__tech-figure {
    max-width: 720px;
  }
}

@media (min-width: 1440px) {
  .page-about__brand-rail {
    position: sticky;
    top: calc(var(--header-height) + 1rem);
    align-self: start;
  }
}