.page-about {
  --about-purple-glow: rgba(139, 92, 246, 0.35);
  --about-green-glow: rgba(182, 255, 61, 0.2);
  --about-timeline-w: 240px;
  background: var(--color-bg);
  color: var(--color-text);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 48px;
  background: var(--gradient-night);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.42;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(11, 16, 32, 0.7), rgba(11, 16, 32, 0.35) 58%, var(--color-bg) 96%);
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--color-text-2);
  margin: 0;
}

.page-about .breadcrumb__link {
  color: var(--color-text-2);
  text-decoration: none;
  transition: color 0.25s;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus {
  color: var(--color-accent);
}

.page-about .about-hero__grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 48px;
}

.page-about .about-hero__main h1 {
  font-family: var(--font-display);
  font-size: clamp(2.7rem, 9vw, 6rem);
  line-height: 0.96;
  letter-spacing: 0.01em;
  margin: 14px 0 20px;
  max-width: 13ch;
}

.page-about .about-hero__lead {
  max-width: 58ch;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-text-2);
  margin: 0;
}

.page-about .about-hero__aside {
  align-self: flex-start;
  border-left: 2px solid var(--color-purple);
  padding-left: 12px;
  color: var(--color-accent);
  font-size: 0.82rem;
  letter-spacing: 0.28em;
  line-height: 1.6;
  text-transform: uppercase;
  margin: 6px 0 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  margin: 44px 0 0;
}

.page-about .about-stats__item {
  background: var(--color-bg-2);
  padding: 16px 18px;
}

.page-about .about-stats__item dt {
  font-size: 0.78rem;
  color: var(--color-text-2);
  letter-spacing: 0.04em;
}

.page-about .about-stats__item dd {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-accent);
}

.page-about .about-stats__item dd .num {
  font-family: inherit;
}

.page-about .section-head {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: start;
  gap: 0 14px;
  margin-bottom: 8px;
}

.page-about .section-head__num {
  grid-row: 1 / 3;
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-purple);
}

.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  line-height: 1.02;
  color: var(--color-text);
}

.page-about .section-head__note {
  margin: 6px 0 0;
  font-size: 0.84rem;
  color: var(--color-text-2);
  letter-spacing: 0.06em;
  border-left: 2px solid var(--color-accent);
  padding-left: 10px;
}

.page-about .about-milestones {
  padding: 72px 0 32px;
}

.page-about .about-timeline-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 32px 0 44px;
}

.page-about .about-timeline-nav a {
  display: inline-block;
  padding: 6px 16px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid var(--color-line);
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}

.page-about .about-timeline-nav a:hover,
.page-about .about-timeline-nav a:focus {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(182, 255, 61, 0.07);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 52px 26px;
}

.page-about .timeline-item__year {
  font-family: var(--font-display);
  font-size: 3.2rem;
  line-height: 0.9;
  color: var(--color-text);
  margin-bottom: 10px;
  transition: color 0.3s, transform 0.3s;
}

.page-about .timeline-item__line {
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: -8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-purple), var(--color-accent));
  opacity: 0.55;
  border-radius: 2px;
}

.page-about .timeline-item:last-child .timeline-item__line {
  display: none;
}

.page-about .timeline-item__content {
  background: var(--color-bg-3);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-purple);
  padding: 20px 20px 18px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.page-about .timeline-item__content h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--color-text);
}

.page-about .timeline-item__content p {
  margin: 8px 0;
  color: var(--color-text-2);
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-about .timeline-item__details {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--color-text-2);
  border-top: 1px dashed var(--color-line);
  padding-top: 10px;
}

.page-about .timeline-item__details summary {
  cursor: pointer;
  color: var(--color-accent);
  font-weight: 600;
  list-style: none;
  transition: opacity 0.25s;
}

.page-about .timeline-item__details summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-item__details summary::before {
  content: "＋ ";
}

.page-about .timeline-item__details[open] summary::before {
  content: "－ ";
}

.page-about .timeline-item__details p {
  margin: 10px 0 0;
  font-size: 0.9rem;
}

.page-about .timeline-item:hover .timeline-item__year {
  color: var(--color-accent);
  transform: translateX(4px);
}

.page-about .timeline-item:hover .timeline-item__content {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--about-green-glow), 0 16px 32px rgba(0, 0, 0, 0.28);
}

.page-about .about-team {
  padding: 72px 0;
  background: var(--color-bg-2);
  border-top: 1px solid var(--color-line);
}

.page-about .about-team__grid {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .about-team__text p {
  margin: 0 0 16px;
  color: var(--color-text-2);
  line-height: 1.75;
  font-size: 0.98rem;
  max-width: 58ch;
}

.page-about .about-team__roster {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-team__roster-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px;
  background: var(--color-bg-3);
  border: 1px solid var(--color-line);
  transition: border-color 0.25s, box-shadow 0.25s;
}

.page-about .about-team__roster-item:hover {
  border-color: var(--color-purple);
  box-shadow: 0 0 18px var(--about-purple-glow);
}

.page-about .about-team__roster-item strong {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-accent);
}

.page-about .about-team__roster-item span {
  font-size: 0.9rem;
  color: var(--color-text);
}

.page-about .about-team__figure {
  margin: 0;
  align-self: start;
}

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
  display: block;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--color-text-2);
  letter-spacing: 0.03em;
}

.page-about .about-tech {
  padding: 72px 0;
}

.page-about .about-tech__grid {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .about-tech__figure {
  margin: 0;
  align-self: start;
}

.page-about .about-tech__figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
  display: block;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}

.page-about .about-tech__figure figcaption {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--color-text-2);
}

.page-about .about-tech__content {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-tech__item {
  background: var(--color-bg-3);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-purple);
  padding: 18px 20px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.page-about .about-tech__item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 22px var(--about-green-glow);
}

.page-about .about-tech__index {
  font-family: var(--font-display);
  font-size: 0.82rem;
  color: var(--color-accent);
  letter-spacing: 0.12em;
}

.page-about .about-tech__item h3 {
  margin: 8px 0 6px;
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--color-text);
}

.page-about .about-tech__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--color-text-2);
}

.page-about .about-responsibility {
  padding: 72px 0;
  background: var(--gradient-night);
  border-top: 1px solid var(--color-line);
}

.page-about .about-responsibility__grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.page-about .about-responsibility__item {
  position: relative;
  padding: 26px 22px 22px;
  background: rgba(17, 26, 51, 0.88);
  border: 1px solid var(--color-line);
}

.page-about .about-responsibility__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 3px;
  background: var(--gradient-crystal);
}

.page-about .about-responsibility__item h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.page-about .about-responsibility__item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--color-text-2);
}

.page-about .about-responsibility__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-responsibility__link {
  display: inline-block;
  padding: 10px 20px;
  font-size: 0.92rem;
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid var(--color-line);
  transition: border-color 0.25s, color 0.25s, background 0.25s;
}

.page-about .about-responsibility__link:hover,
.page-about .about-responsibility__link:focus {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(182, 255, 61, 0.06);
}

.page-about .about-responsibility__outro {
  margin-top: 28px;
  font-size: 0.95rem;
  color: var(--color-text-2);
  line-height: 1.8;
}

.page-about .about-responsibility__outro a {
  color: var(--color-purple);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.25s;
}

.page-about .about-responsibility__outro a:hover {
  color: var(--color-accent);
}

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

@media (min-width: 992px) {
  .page-about .about-hero {
    padding: 88px 0 64px;
  }

  .page-about .about-hero__bg {
    opacity: 0.5;
  }

  .page-about .about-hero__grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px;
    padding-top: 72px;
  }

  .page-about .about-hero__main h1 {
    font-size: clamp(3.6rem, 6vw, 6.4rem);
  }

  .page-about .about-hero__aside {
    writing-mode: vertical-rl;
    border-left: none;
    border-right: 1px solid var(--color-line);
    padding-right: 12px;
    padding-left: 0;
    margin-top: 0;
  }

  .page-about .about-stats__item {
    padding: 20px 22px;
  }

  .page-about .about-stats__item dd {
    font-size: 2.4rem;
  }

  .page-about .about-milestones {
    padding: 96px 0 48px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: var(--about-timeline-w) 72px 1fr;
    padding: 0 0 72px 0;
  }

  .page-about .timeline-item__year {
    text-align: right;
    font-size: 5rem;
    margin-bottom: 0;
  }

  .page-about .timeline-item__line {
    left: var(--about-timeline-w);
    top: 14px;
    bottom: -18px;
  }

  .page-about .timeline-item__content {
    padding: 24px 28px;
  }

  .page-about .timeline-item:hover .timeline-item__year {
    transform: translateX(-4px);
  }

  .page-about .about-team {
    padding: 96px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1fr 0.92fr;
    gap: 56px;
    margin-top: 44px;
  }

  .page-about .about-tech {
    padding: 96px 0;
  }

  .page-about .about-tech__grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    margin-top: 44px;
  }

  .page-about .about-tech__content {
    padding-top: 12px;
  }

  .page-about .about-responsibility {
    padding: 96px 0;
  }

  .page-about .about-responsibility__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}