.page-about {
  --about-pad: clamp(52px, 8vw, 104px);
  --about-gap: clamp(18px, 2.6vw, 34px);
  --about-card: rgba(17, 29, 66, 0.72);
  background: var(--void-navy);
  color: var(--ice-white);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about .about-hero__title,
.page-about .about-section,
.page-about #about-start {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.about-crumbs {
  padding-top: 20px;
}

.about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--molten-gold);
}

.about-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--molten-gold);
}

.about-hero {
  position: relative;
  padding: 0 0 var(--about-pad);
  border-bottom: var(--hairline);
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(104deg, rgba(36, 52, 95, 0.42) 0 1px, transparent 1px 112px),
    radial-gradient(circle at 82% 14%, rgba(255, 138, 30, 0.16), transparent 56%);
  pointer-events: none;
}

.about-hero .shell {
  position: relative;
  z-index: 1;
}

.about-hero__grid {
  display: grid;
  gap: 26px;
  padding-top: clamp(22px, 4vw, 44px);
}

.about-hero__title {
  font-size: clamp(40px, 9vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 10px 0 0;
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.about-hero__lede {
  max-width: 42ch;
  margin-top: 22px;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: var(--steel-mist);
}

.about-hero__aside {
  display: grid;
  gap: 16px;
  padding-top: 18px;
  border-top: var(--hairline);
}

.about-hero__note {
  display: none;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel-mist);
}

.about-hero__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-hero__index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 2px;
  font-size: 13px;
  color: var(--steel-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.about-hero__index a:hover {
  color: var(--ice-white);
  border-bottom-color: var(--molten-gold);
}

.about-hero__index a:focus-visible {
  outline: 2px solid var(--ice-white);
  outline-offset: 3px;
}

.about-hero__index .mono {
  font-size: 11px;
  color: var(--molten-gold);
}

.about-section {
  position: relative;
  padding-block: var(--about-pad);
  border-bottom: var(--hairline);
}

.about-section:last-of-type {
  border-bottom: none;
}

.about-block-head {
  display: grid;
  gap: 14px;
  max-width: 64ch;
  margin-bottom: var(--about-gap);
}

.about-block__title {
  font-size: clamp(26px, 4.4vw, 44px);
}

.about-block__text {
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel-mist);
}

.about-origin__grid {
  display: grid;
  gap: 24px;
}

.about-origin__body {
  display: grid;
  gap: 16px;
}

.about-origin__body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel-mist);
}

.about-pull-list {
  list-style: none;
  display: grid;
  gap: 2px;
  margin: 8px 0 0;
  padding: 0;
}

.about-pull-list li {
  position: relative;
  padding: 12px 0 12px 20px;
  border-top: var(--hairline);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice-white);
}

.about-pull-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 10px;
  height: 2px;
  background: var(--molten-gold);
}

.about-figure,
.about-tianjin__figure,
.about-records__figure {
  margin: 0;
  min-width: 0;
}

.about-figure .media-frame {
  aspect-ratio: 3 / 2;
}

.about-tianjin__figure .media-frame {
  aspect-ratio: 4 / 3;
}

.about-records__figure .media-frame {
  aspect-ratio: 10 / 7;
}

.about-figure__caption {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel-mist);
}

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

.about-track__item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 26px;
}

.about-track__item::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 42px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-blue), rgba(36, 52, 95, 0.12));
}

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

.about-track__item:last-child::before {
  display: none;
}

.about-track__node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-blue);
  border-radius: 50%;
  background: var(--void-navy);
  color: var(--molten-gold);
  font-size: 12px;
}

.about-track__card {
  padding: 18px;
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(17, 29, 66, 0.78), rgba(10, 18, 48, 0.46));
  box-shadow: var(--shadow-soft);
}

.about-track__item:last-child .about-track__card {
  border-color: rgba(255, 138, 30, 0.45);
}

.about-track__stage {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.about-track__title {
  font-size: clamp(18px, 2.4vw, 22px);
  margin-bottom: 8px;
}

.about-track__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel-mist);
}

.about-system {
  background: var(--deep-space);
}

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

.about-columns__item {
  display: grid;
  gap: 6px;
  padding: 16px;
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  background: rgba(10, 18, 48, 0.7);
}

.about-columns__num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--molten-gold);
}

.about-columns__name {
  font-size: 17px;
}

.about-columns__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel-mist);
}

.about-columns__note {
  max-width: 62ch;
  margin-top: 22px;
  padding-left: 16px;
  border-left: 1px solid var(--line-blue);
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-mist);
}

.about-cycle {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line-blue);
  background: var(--line-blue);
}

.about-cycle__step {
  display: grid;
  gap: 8px;
  padding: 18px;
  background: var(--deep-space);
}

.about-cycle__num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.about-cycle__title {
  font-size: 18px;
}

.about-cycle__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-mist);
}

.about-push {
  max-width: 72ch;
  margin-top: calc(var(--about-gap) + 6px);
  padding-left: 18px;
  border-left: 2px solid var(--molten-gold);
}

.about-push__title {
  font-size: 20px;
  margin-bottom: 10px;
}

.about-push__list {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0 0 14px;
  padding: 0;
}

.about-push__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel-mist);
}

.about-push__list .mono {
  min-width: 72px;
  color: var(--amber-light);
  font-size: 12px;
}

.about-push__note {
  margin-bottom: 16px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--steel-mist);
}

.about-tianjin {
  background:
    radial-gradient(circle at 80% 22%, rgba(255, 138, 30, 0.09), transparent 58%),
    var(--void-navy);
}

.about-tianjin__grid {
  display: grid;
  gap: 26px;
}

.about-tianjin__text {
  display: grid;
  align-content: start;
  gap: 16px;
}

.about-tianjin__addr {
  padding-top: 12px;
  border-top: var(--hairline);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice-white);
}

.about-tianjin__addr .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel-mist);
}

.about-link {
  justify-self: start;
  font-size: 14px;
  color: var(--amber-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 196, 107, 0.5);
  padding-bottom: 2px;
}

.about-link:hover {
  color: var(--ice-white);
  border-bottom-color: var(--ice-white);
}

.about-link:focus-visible {
  outline: 2px solid var(--ice-white);
  outline-offset: 3px;
}

.about-roles {
  margin-top: calc(var(--about-gap) + 10px);
}

.about-roles .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.about-roles .tabs__tab {
  padding: 10px 14px;
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  background: transparent;
  color: var(--steel-mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.about-roles .tabs__tab[aria-selected="true"] {
  border-color: var(--molten-gold);
  background: rgba(255, 138, 30, 0.1);
  color: var(--ice-white);
}

.about-roles .tabs__tab:focus-visible {
  outline: 2px solid var(--ice-white);
  outline-offset: 2px;
}

.about-roles .tabs__panel {
  margin-top: 12px;
  padding: 18px;
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  background: rgba(10, 18, 48, 0.6);
}

.about-role p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel-mist);
}

.about-records {
  background: linear-gradient(180deg, rgba(17, 29, 66, 0.5), var(--void-navy));
}

.about-records__grid {
  display: grid;
  gap: 26px;
}

.about-records__text {
  display: grid;
  align-content: start;
  gap: 16px;
}

.about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  padding: 18px 0;
  border-top: var(--hairline);
  border-bottom: var(--hairline);
}

.about-stat {
  display: grid;
  gap: 2px;
}

.about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  letter-spacing: -0.03em;
  color: var(--ice-white);
}

.about-stat:first-child .about-stat__num {
  color: var(--molten-gold);
}

.about-stat__label {
  font-size: 12px;
  color: var(--steel-mist);
}

.about-records__text .btn {
  justify-self: start;
}

.about-cta {
  padding-block: var(--about-pad);
}

.about-cta__inner {
  display: grid;
  gap: 20px;
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid rgba(255, 138, 30, 0.45);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 138, 30, 0.14), rgba(43, 240, 200, 0.06));
}

.about-cta__title {
  font-size: clamp(24px, 4vw, 38px);
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 640px) {
  .about-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-cycle {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(210px, 0.55fr);
    align-items: end;
    gap: 48px;
  }

  .about-hero__aside {
    display: grid;
    gap: 22px;
    padding-top: 0;
    padding-left: 22px;
    border-top: none;
    border-left: var(--hairline);
  }

  .about-hero__note {
    display: block;
    writing-mode: vertical-rl;
    letter-spacing: 0.24em;
    line-height: 1;
  }

  .about-hero__index {
    display: grid;
    gap: 8px;
  }

  .about-origin__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
  }

  .about-track__item {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 24px;
    padding-bottom: 34px;
  }

  .about-track__item::before {
    left: 26px;
    top: 54px;
  }

  .about-track__node {
    width: 52px;
    height: 52px;
  }

  .about-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .about-tianjin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }

  .about-records__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: center;
  }

  .about-cta__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}