.page-about {
  --about-gutter: 20px;
  --about-max: 1100px;
  --about-heading: 42px;
  position: relative;
  padding: var(--about-gutter) var(--about-gutter) 68px;
  font-family: var(--by-body);
  line-height: 1.6;
  color: var(--by-nearwhite);
  background:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    var(--by-deep);
  background-size: 34px 34px, 34px 34px, auto;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .about-crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  color: var(--by-gray);
  margin-bottom: 30px;
}

.page-about .about-crumbs a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  transition: color 0.25s var(--by-ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--by-orange);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-crumbs__sep {
  color: rgba(255, 255, 255, 0.28);
}

.page-about .about-crumbs__current {
  color: var(--by-nearwhite);
  font-weight: 500;
}

.page-about .about-hero {
  position: relative;
  padding: 34px 0 46px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.16);
}

.page-about .about-hero__side {
  position: absolute;
  top: 30px;
  right: 0;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--by-display);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--by-gray);
  border-right: 1px solid var(--by-line);
  padding-right: 9px;
  line-height: 1.3;
}

.page-about .about-hero__bar {
  width: 78px;
  height: 14px;
  background: var(--by-orange);
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
  margin-bottom: 24px;
}

.page-about .about-hero__kicker {
  margin: 0 0 6px;
  font-family: var(--by-display);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--by-gold);
}

.page-about .about-hero__title {
  margin: 0 0 0.12em;
  max-width: 10em;
  font-family: var(--by-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 11vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: 0.02em;
  color: var(--by-nearwhite);
}

.page-about .about-hero__subtitle {
  margin: 0 0 20px;
  padding-left: 14px;
  border-left: 4px solid var(--by-orange);
  font-size: 1.04rem;
  letter-spacing: 0.04em;
  color: var(--by-data);
}

.page-about .about-hero__abstract {
  max-width: 34em;
  margin: 0;
  font-size: 0.97rem;
  color: var(--by-gray);
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.14);
  margin-bottom: 26px;
}

.page-about .about-section-head__num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-family: var(--by-display);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--by-orange);
  border: 2px solid var(--by-orange);
  transform: rotate(-8deg);
}

.page-about .about-section-head__text h2 {
  margin: 0;
  font-family: var(--by-display);
  font-size: 1.7rem;
  line-height: 1.1;
  color: var(--by-nearwhite);
}

.page-about .about-section-head__text p {
  margin: 5px 0 0;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--by-gray);
}

.page-about .about-section-head__side {
  display: none;
}

.page-about .about-who,
.page-about .about-timeline,
.page-about .about-stats,
.page-about .about-operation {
  margin-top: 56px;
}

.page-about .about-who__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-who__main {
  padding: 22px 20px;
  background: var(--by-dark);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--by-shadow);
}

.page-about .about-who__main p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  color: var(--by-gray);
}

.page-about .about-who__main p:last-child {
  margin-bottom: 0;
}

.page-about .about-who__aside {
  align-self: start;
  padding: 16px 18px;
  background: rgba(255, 107, 53, 0.07);
  border-left: 4px solid var(--by-orange);
}

.page-about .about-who__aside-title {
  margin: 0 0 10px;
  font-family: var(--by-display);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--by-gold);
}

.page-about .about-who__tags {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-who__tags li {
  padding: 8px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  font-size: 0.92rem;
  color: var(--by-nearwhite);
}

.page-about .about-who__tags li:last-child {
  border-bottom: 0;
}

.page-about .about-timeline__media {
  margin: 0 0 34px;
  padding: 8px;
  background: var(--by-dark);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 22px;
  border-left: 2px solid rgba(255, 255, 255, 0.14);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 12px;
  left: -6px;
  width: 10px;
  height: 10px;
  background: var(--by-orange);
  transform: rotate(45deg);
}

.page-about .about-timeline__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-timeline__version {
  font-family: var(--by-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 9vw, 3.6rem);
  line-height: 1;
  color: var(--by-orange);
}

.page-about .about-timeline__tag {
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--by-gold);
  border: 1px solid rgba(212, 175, 55, 0.55);
  padding: 3px 9px;
}

.page-about .about-timeline__content {
  margin-top: 14px;
}

.page-about .about-timeline__content h3 {
  margin: 0 0 8px;
  font-family: var(--by-display);
  font-size: 1.32rem;
  line-height: 1.2;
  color: var(--by-nearwhite);
}

.page-about .about-timeline__content > p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--by-gray);
}

.page-about .about-timeline__detail {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--by-gold);
}

.page-about .about-timeline__detail p {
  margin: 0;
  font-size: 0.89rem;
  color: var(--by-gray);
}

.page-about .about-timeline__toggle {
  margin-top: 12px;
  padding: 6px 14px;
  background: transparent;
  border: 1px dashed rgba(255, 255, 255, 0.42);
  color: var(--by-gray);
  font-family: var(--by-body);
  font-size: 0.84rem;
  cursor: pointer;
  transition: border-color 0.25s var(--by-ease), color 0.25s var(--by-ease), background 0.25s var(--by-ease);
}

.page-about .about-timeline__toggle:hover,
.page-about .about-timeline__toggle:focus-visible {
  border-color: var(--by-orange);
  color: var(--by-nearwhite);
  background: rgba(255, 107, 53, 0.08);
}

.page-about .about-stats__grid {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-stat-card {
  position: relative;
  min-height: 116px;
  padding: 18px 14px 14px;
  background: rgba(31, 58, 95, 0.62);
  border: 1px solid rgba(154, 174, 191, 0.3);
  overflow: hidden;
  transition: background 0.25s var(--by-ease), transform 0.25s var(--by-ease), box-shadow 0.25s var(--by-ease);
}

.page-about .about-stat-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--by-orange);
}

.page-about .about-stat-card:hover,
.page-about .about-stat-card:focus-within {
  background: rgba(31, 58, 95, 0.84);
  transform: translateY(-2px);
  box-shadow: var(--by-shadow);
}

.page-about .about-stat-card__label {
  margin: 0 0 8px;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--by-gray);
  order: 2;
}

.page-about .about-stat-card__num {
  margin: 0;
  font-family: var(--by-display);
  font-weight: 700;
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1;
  color: var(--by-nearwhite);
  order: 1;
}

.page-about .about-stat-card__unit {
  margin-left: 2px;
  color: var(--by-orange);
}

.page-about .about-stats__content {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.page-about .about-stats__figure {
  margin: 0;
  padding: 8px;
  background: var(--by-dark);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.page-about .about-stats__figure figcaption,
.page-about .about-operation__figure figcaption {
  margin-top: 6px;
  padding: 7px 10px;
  background: rgba(31, 58, 95, 0.35);
  border-left: 3px solid var(--by-orange);
  font-size: 0.8rem;
  color: var(--by-gray);
}

.page-about .about-stats__text p {
  margin: 0 0 14px;
  font-size: 0.94rem;
  color: var(--by-gray);
}

.page-about .about-stats__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-operation__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-operation__info {
  padding: 24px 20px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08), transparent 52%), var(--by-steel);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--by-shadow);
}

.page-about .about-operation__info > p {
  margin: 0 0 18px;
  font-size: 0.94rem;
  color: var(--by-gray);
}

.page-about .about-operation__list {
  margin: 0;
  padding: 0;
}

.page-about .about-operation__row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.16);
}

.page-about .about-operation__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-operation__row dt {
  flex: 0 0 auto;
  font-size: 0.88rem;
  color: var(--by-gray);
}

.page-about .about-operation__row dd {
  margin: 0;
  text-align: right;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--by-nearwhite);
  word-break: break-word;
}

.page-about .about-operation__figure {
  margin: 0;
  padding: 8px;
  background: var(--by-dark);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.page-about .about-links {
  margin-top: 58px;
  padding-top: 30px;
  border-top: 2px solid var(--by-line);
}

.page-about .about-links h2 {
  margin: 0 0 20px;
  font-family: var(--by-display);
  font-size: 1.6rem;
  line-height: 1.2;
  color: var(--by-nearwhite);
}

.page-about .about-links__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-links__list a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 16px;
  background: rgba(31, 58, 95, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--by-nearwhite);
  font-size: 0.92rem;
  text-decoration: none;
  transition: background 0.25s var(--by-ease), transform 0.25s var(--by-ease), box-shadow 0.25s var(--by-ease), border-color 0.25s var(--by-ease);
}

.page-about .about-links__list a span {
  flex: 0 0 auto;
  min-width: 4.5em;
  font-family: var(--by-display);
  font-weight: 700;
  color: var(--by-orange);
}

.page-about .about-links__list a:hover,
.page-about .about-links__list a:focus-visible {
  background: rgba(31, 58, 95, 0.78);
  border-color: rgba(255, 107, 53, 0.6);
  transform: translateX(3px);
  box-shadow: var(--by-shadow);
}

.page-about :focus-visible {
  outline: 3px solid var(--by-orange);
  outline-offset: 3px;
}

@media (min-width: 768px) {
  .page-about {
    --about-gutter: 30px;
    padding: 38px 32px 76px;
  }

  .page-about .about-hero__title {
    font-size: clamp(3rem, 7vw, 5.2rem);
  }

  .page-about .about-section-head {
    margin-bottom: 34px;
  }

  .page-about .about-section-head__side {
    display: block;
    margin-left: auto;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--by-display);
    font-size: 0.7rem;
    letter-spacing: 0.24em;
    color: var(--by-gray);
    border-right: 1px solid var(--by-line);
    padding-right: 9px;
    line-height: 1.3;
    height: 66px;
  }

  .page-about .about-who__grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-stats__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .about-stats__content {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-operation__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    align-items: start;
  }

  .page-about .about-links__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-gutter: 40px;
    max-width: var(--about-max);
    margin: 0 auto;
    padding: 48px 52px 92px;
  }

  .page-about .about-hero {
    padding: 44px 0 58px;
  }

  .page-about .about-hero__abstract {
    margin-left: 12%;
  }

  .page-about .about-who,
  .page-about .about-timeline,
  .page-about .about-stats,
  .page-about .about-operation {
    margin-top: 84px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-timeline__meta {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    padding-top: 4px;
  }

  .page-about .about-timeline__content {
    margin-top: 0;
    padding-right: 8%;
  }

  .page-about .about-stats__grid {
    gap: 18px;
  }

  .page-about .about-operation__info {
    padding: 30px 28px;
  }

  .page-about .about-links {
    margin-top: 78px;
  }
}