.page-about {
  --about-rotate: rotate(2deg);
  background: var(--color-page);
}

.page-about > .breadcrumb {
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 20px 0;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-version {
  position: relative;
  padding-top: 48px;
}

.page-about .about-version__head {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

.page-about .about-version__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 10px;
}

.page-about .about-version h1 {
  font-family: var(--font-head);
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 800;
  line-height: 1.28;
  color: var(--color-text);
  margin: 0 0 12px;
}

.page-about .about-version__lead {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
  max-width: 760px;
  margin: 0;
}

.page-about .about-version__stamp {
  display: none;
}

.page-about .version-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .version-card {
  background: var(--color-card);
  border: 2px solid var(--color-border);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .version-card--primary {
  border-color: var(--color-accent);
  box-shadow: 0 0 24px rgba(200, 255, 0, 0.16);
}

.page-about .version-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 10px 28px rgba(200, 255, 0, 0.12);
}

.page-about .version-card__label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.page-about .version-card__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}

.page-about .version-card__note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}

.page-about .about-version__img {
  margin: 28px 0 0;
  max-width: 640px;
}

.page-about .about-structure {
  padding-top: 48px;
}

.page-about .about-structure__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-structure__aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-structure__img {
  margin: 0;
}

.page-about .about-structure__note {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
  border-left: 2px solid var(--color-accent);
  padding-left: 12px;
  margin: 0;
}

.page-about .tree-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px 40px;
}

.page-about .tree-grid__col {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .tree-branch {
  position: relative;
}

.page-about .tree-branch__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-left: 3px solid var(--color-accent);
  padding: 4px 0 4px 10px;
  margin-bottom: 6px;
  transition: background 0.15s ease;
}

.page-about .tree-branch__head:hover {
  background: rgba(200, 255, 0, 0.07);
}

.page-about .tree-branch__name {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--color-text);
}

.page-about .tree-branch__count {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  color: var(--color-accent);
  white-space: nowrap;
}

.page-about .tree-branch__children {
  list-style: none;
  margin: 0;
  padding: 0 0 0 14px;
  border-left: 1px dashed var(--color-border);
}

.page-about .tree-branch__children li {
  position: relative;
  padding: 3px 0 3px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.55;
}

.page-about .tree-branch__children li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 1px;
  background: var(--color-border);
}

.page-about .tree-branch__children li:hover {
  color: var(--color-text);
}

.page-about .about-timeline {
  padding-top: 48px;
}

.page-about .about-timeline__list {
  position: relative;
  display: flex;
  flex-direction: column;
  margin-top: 28px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 28px;
  bottom: 28px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-new), var(--color-hot), var(--color-done));
  opacity: 0.55;
  z-index: 0;
}

.page-about .timeline-item {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 16px;
  padding: 18px 0;
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 58, 69, 0.55);
  transition: background 0.15s ease;
}

.page-about .timeline-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.page-about .timeline-item__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-done);
  box-shadow: 0 0 8px rgba(0, 230, 118, 0.4);
  flex-shrink: 0;
  margin-top: 5px;
}

.page-about .timeline-item__dot--new {
  background: var(--color-new);
  box-shadow: 0 0 8px rgba(255, 59, 59, 0.4);
}

.page-about .timeline-item__dot--hot {
  background: var(--color-hot);
  box-shadow: 0 0 8px rgba(255, 196, 0, 0.4);
}

.page-about .timeline-item__dot--done {
  background: var(--color-done);
  box-shadow: 0 0 8px rgba(0, 230, 118, 0.4);
}

.page-about .timeline-item__body {
  flex: 1;
}

.page-about .timeline-item__top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .timeline-item__batch {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  color: var(--color-accent);
  background: rgba(200, 255, 0, 0.1);
  padding: 2px 8px;
  transition: color 0.15s ease, background 0.15s ease;
}

.page-about .timeline-item:hover .timeline-item__batch {
  color: var(--color-page);
  background: var(--color-accent);
}

.page-about .timeline-item__title {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin: 5px 0 4px;
}

.page-about .timeline-item__meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.page-about .about-devices {
  padding-top: 48px;
}

.page-about .about-devices__img {
  margin: 28px 0 0;
}

.page-about .about-devices__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 28px;
}

.page-about .device-card {
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-top-width: 4px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .device-card:nth-child(1) {
  border-top-color: var(--color-yellow);
}

.page-about .device-card:nth-child(2) {
  border-top-color: var(--color-cyan);
}

.page-about .device-card:nth-child(3) {
  border-top-color: var(--color-orange);
}

.page-about .device-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.page-about .device-card:nth-child(1) .device-card__icon {
  color: var(--color-yellow);
}

.page-about .device-card:nth-child(2) .device-card__icon {
  color: var(--color-cyan);
}

.page-about .device-card:nth-child(3) .device-card__icon {
  color: var(--color-orange);
}

.page-about .device-card__icon {
  display: flex;
  justify-content: center;
  padding: 8px 0 4px;
}

.page-about .device-card__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--color-text);
  text-align: center;
  margin: 0;
}

.page-about .device-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .device-card__list li {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-muted);
  padding-left: 16px;
  position: relative;
}

.page-about .device-card__list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.page-about .about-links {
  padding-top: 48px;
}

.page-about .about-links__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-links__grid .tile {
  text-decoration: none;
  min-height: 120px;
}

.page-about .about-links__grid .tile:hover {
  transform: translateY(-4px);
}

@media (min-width: 768px) {
  .page-about .version-card-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-structure__grid {
    grid-template-columns: 300px 1fr;
    align-items: start;
  }

  .page-about .tree-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-devices__grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (min-width: 1024px) {
  .page-about .about-version__head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .about-version__stamp {
    display: block;
    font-family: var(--font-head);
    font-size: 68px;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
    text-shadow: 0 0 28px rgba(200, 255, 0, 0.35);
    border: 3px solid var(--color-accent);
    padding: 12px 22px;
    transform: var(--about-rotate);
    white-space: nowrap;
  }

  .page-about .about-structure__img {
    position: sticky;
    top: 24px;
  }
}