.page-about {
  background-color: var(--c-deep);
  color: var(--c-text);
  position: relative;
  overflow-x: hidden;
  --about-grid: rgba(255, 248, 231, 0.07);
  --about-grid-strong: rgba(255, 248, 231, 0.16);
  --about-purple-mask: rgba(112, 48, 160, 0.3);
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 48px 48px;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h-mobile) + 20px);
  margin-bottom: 0;
}
.page-about .breadcrumb__item {
  font-size: 13px;
}
.page-about .breadcrumb__item a {
  color: var(--c-text-dim);
  text-decoration: none;
}
.page-about .breadcrumb__item a:hover {
  color: var(--c-green);
}
.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--c-green);
}

.page-about .section__label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-green);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.page-about .section__label::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--c-green);
  flex: 0 0 auto;
}
.page-about .section__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-dim);
  max-width: 72ch;
}

.page-about .figure {
  border: 1px solid var(--c-line);
  background: rgba(255, 248, 231, 0.02);
}
.page-about .figure__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
  padding: 10px 12px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-hero {
  padding-top: calc(var(--header-h-mobile) + 48px);
  padding-bottom: 56px;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}
.page-about .about-hero__content {
  min-width: 0;
}
.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-green);
  margin: 0 0 18px;
}
.page-about .about-hero__kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--c-green);
  flex: 0 0 auto;
}
.page-about .about-hero__title-wrap {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 24px;
}
.page-about .about-hero__title-wrap h1 {
  margin: 0;
  min-width: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.08;
  letter-spacing: 0;
}
.page-about .about-hero__title-wrap .vertical-text {
  font-size: 12px;
  letter-spacing: 0.28em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: var(--c-orange);
  padding-top: 6px;
  flex: 0 0 auto;
}
.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text-dim);
  margin-bottom: 32px;
  max-width: 58ch;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-bottom: 32px;
}
.page-about .about-hero__meta-item {
  font-size: 14px;
  color: var(--c-text-dim);
}
.page-about .about-hero__meta-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--c-text);
  margin-bottom: 2px;
}
.page-about .about-hero__visual {
  min-width: 0;
}
.page-about .about-hero__visual svg {
  width: 100%;
  height: auto;
  display: block;
  background:
    radial-gradient(circle at 50% 50%, var(--about-purple-mask), transparent 70%),
    rgba(255, 248, 231, 0.03);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
}
.page-about .about-hero__visual polyline {
  stroke-dasharray: 10 6;
  animation: about-scan 12s linear infinite;
}

@keyframes about-scan {
  to {
    stroke-dashoffset: -240;
  }
}

.page-about .about-mission {
  border-top: 1px solid var(--c-line);
  padding: 48px 0;
}
.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.page-about .about-mission__text h2 {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 0 0 20px;
}
.page-about .about-mission__text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-dim);
  margin: 0 0 20px;
}
.page-about .about-mission__note {
  display: flex;
  gap: 16px;
  border-left: 2px solid var(--c-orange);
  padding: 16px 0 16px 20px;
  background: rgba(255, 106, 0, 0.06);
}
.page-about .about-mission__note .mono {
  color: var(--c-orange);
  font-size: 13px;
  flex: 0 0 auto;
}
.page-about .about-mission__note p {
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
  color: var(--c-text);
}
.page-about .about-mission__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
}
.page-about .about-stat {
  border: 1px solid var(--c-line);
  background: rgba(43, 27, 61, 0.42);
  padding: 20px;
  position: relative;
}
.page-about .about-stat::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  border-bottom: 14px solid var(--c-green);
  border-left: 14px solid transparent;
}
.page-about .about-stat__num {
  display: block;
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  color: var(--c-green);
  line-height: 1;
  margin-bottom: 10px;
}
.page-about .about-stat__label {
  font-size: 14px;
  color: var(--c-text-dim);
  line-height: 1.5;
}

.page-about .about-milestones {
  padding: 48px 0;
  background: linear-gradient(180deg, rgba(112, 48, 160, 0.16), rgba(11, 27, 61, 0) 40%);
  border-top: 1px solid var(--c-line);
}
.page-about .about-milestones__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .about-milestones__aside {
  display: flex;
  align-items: center;
  gap: 14px;
}
.page-about .about-milestones__aside .vertical-text {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-orange);
  flex: 0 0 auto;
}
.page-about .about-milestones__aside-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-dim);
  margin: 0;
  max-width: 32ch;
}
.page-about .about-milestones__content {
  min-width: 0;
}
.page-about .about-milestones__content h2 {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 0 0 16px;
}
.page-about .about-milestones__content .section__lead {
  margin: 0 0 28px;
}
.page-about .about-milestones__map {
  margin: 0 0 36px;
}
.page-about .about-milestones__map img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}
.page-about .about-timeline {
  border-left: 1px solid var(--c-line-strong);
  margin: 0;
  padding: 6px 0 6px 24px;
  display: grid;
  gap: 16px;
}
.page-about .about-timeline__item {
  position: relative;
  border: 1px solid var(--c-line);
  background: rgba(255, 248, 231, 0.04);
}
.page-about .about-timeline__item[open] {
  border-color: var(--c-line-strong);
  background: rgba(255, 248, 231, 0.07);
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--c-green);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.6);
}
.page-about .about-timeline__item[open]::before {
  background: var(--c-orange);
  box-shadow: 0 0 12px rgba(255, 106, 0, 0.6);
}
.page-about .about-timeline__item summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 6px 14px;
  padding: 16px 18px;
  cursor: pointer;
  position: relative;
}
.page-about .about-timeline__item summary::-webkit-details-marker {
  display: none;
}
.page-about .about-timeline__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--c-orange);
  transition: transform 0.3s var(--ease);
  flex: 0 0 auto;
}
.page-about .about-timeline__item[open] summary::after {
  transform: rotate(45deg);
}
.page-about .about-timeline__mark {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--c-green);
  min-width: 70px;
}
.page-about .about-timeline__head {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-text);
  line-height: 1.5;
  min-width: 0;
}
.page-about .about-timeline__body {
  padding: 0 18px 18px;
}
.page-about .about-timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text-dim);
}

.page-about .about-experts {
  padding: 48px 0;
  border-top: 1px solid var(--c-line);
  background: rgba(43, 27, 61, 0.35);
}
.page-about .about-experts h2 {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 0 0 24px;
}
.page-about .about-experts__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 28px;
}
.page-about .about-experts__intro > p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-dim);
  margin: 0 0 20px;
}
.page-about .about-experts__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-experts__list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-text);
  border: 1px solid var(--c-line);
  background: rgba(11, 27, 61, 0.3);
  padding: 14px 16px;
}
.page-about .about-experts__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--c-green);
  margin-top: 8px;
}
.page-about .about-experts__foot {
  font-size: 14px;
  color: var(--c-text);
  border-left: 2px solid var(--c-purple);
  padding-left: 16px;
}
.page-about .about-experts__figure {
  margin: 0;
}
.page-about .about-experts__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-about .about-architecture {
  padding: 48px 0;
  border-top: 1px solid var(--c-line);
}
.page-about .about-architecture h2 {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 0 0 16px;
}
.page-about .about-architecture .section__lead {
  margin: 0 0 28px;
}
.page-about .about-architecture__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .about-architecture__item {
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-green);
  background: linear-gradient(135deg, rgba(112, 48, 160, 0.24), rgba(11, 27, 61, 0.42));
  padding: 22px 24px;
  position: relative;
}
.page-about .about-architecture__item:nth-child(4) {
  border-top-color: var(--c-orange);
}
.page-about .about-architecture__index {
  display: inline-block;
  font-size: 13px;
  color: var(--c-green);
  letter-spacing: 0.1em;
  padding: 4px 8px;
  border: 1px solid var(--c-line-strong);
  margin-bottom: 16px;
}
.page-about .about-architecture__item:nth-child(4) .about-architecture__index {
  color: var(--c-orange);
}
.page-about .about-architecture__item h3 {
  font-family: var(--font-head);
  font-size: 20px;
  margin: 0 0 10px;
}
.page-about .about-architecture__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text-dim);
}
.page-about .about-architecture__figure {
  margin: 28px 0 0;
  max-width: 640px;
}
.page-about .about-architecture__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-about .about-next {
  padding: 56px 0;
  border-top: 1px solid var(--c-line);
  background: linear-gradient(90deg, rgba(112, 48, 160, 0.32), rgba(11, 27, 61, 0) 80%);
}
.page-about .about-next h2 {
  font-family: var(--font-head);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.15;
  margin: 0 0 12px;
}
.page-about .about-next p {
  margin: 0 0 24px;
  color: var(--c-text-dim);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .about-next__links .btn--primary {
  border: 1px solid var(--c-green);
  color: var(--c-text-dark);
}
.page-about .about-next__links .btn--primary:hover {
  background: var(--c-lime);
}
.page-about .about-next__links .btn--ghost {
  border: 1px solid var(--c-line-strong);
  color: var(--c-text);
}
.page-about .about-next__links .btn--ghost:hover {
  border-color: var(--c-green);
  color: var(--c-green);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--c-green);
  outline-offset: 3px;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }
  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 56px;
  }
  .page-about .about-experts__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
  }
  .page-about .about-architecture__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-milestones__layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
  }
  .page-about .about-milestones__aside {
    position: sticky;
    top: 140px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__visual polyline {
    animation: none;
  }
  .page-about .about-timeline__item[open] summary::after {
    transition: none;
  }
}