.page-about {
  --about-rail-w: 200px;
  --about-gap: 56px;
  --about-band-pad: 36px;
  background-color: var(--obsidian);
  color: var(--frost);
  font-family: var(--font-sans);
}

.page-about .about-top {
  padding-top: 18px;
  padding-bottom: 8px;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0 23px,
    rgba(58, 51, 80, 0.2) 23px 24px
  );
  border-bottom: 1px solid var(--line);
}

.page-about .about-crumb {
  padding-top: 10px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding: 32px 0 40px;
}

.page-about .about-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(32px, 7.6vw, 66px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--frost);
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 0 0 30px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--frost);
  opacity: 0.82;
  max-width: 34em;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  line-height: 1.3;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--gold-light);
}

.page-about .about-fact__cap {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--lilac);
}

.page-about .about-cover {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--hard-shadow);
  background: linear-gradient(158deg, var(--royal-deep), var(--obsidian) 72%);
  transition: border-color var(--t) var(--ease);
}

.page-about .about-cover:hover {
  border-color: var(--gold);
}

.page-about .about-cover .ra-frame__media {
  overflow: hidden;
}

.page-about .about-cover img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .about-cover .ra-frame__cap {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lilac);
}

/* ---------- 数据面板 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 34px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background-color: var(--obsidian);
}

.page-about .about-metric__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold-light);
  background-image: linear-gradient(170deg, var(--gold-light), var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-metric__label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--lilac);
}

/* ---------- 主体：左刻度轴 + 右侧主题带 ---------- */
.page-about .about-body {
  display: grid;
  gap: 0;
  padding-bottom: 56px;
}

.page-about .about-rail {
  padding: 26px 0 6px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--lilac);
}

.page-about .about-rail__list {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  border-left: 1px solid var(--line);
  padding: 6px 0 10px;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  color: var(--lilac);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--line);
  transition: color var(--t) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible,
.page-about .about-rail__link.is-active {
  color: var(--frost);
  border-left-color: var(--gold);
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link:focus-visible .about-rail__num,
.page-about .about-rail__link.is-active .about-rail__num {
  color: var(--gold);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .about-band {
  padding: var(--about-band-pad) 20px 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-band--violet {
  background-image: linear-gradient(
    100deg,
    rgba(27, 12, 51, 0.95),
    rgba(27, 12, 51, 0.42) 68%,
    rgba(7, 6, 11, 0) 100%
  );
}

.page-about .about-band--deep {
  background-image: linear-gradient(
    100deg,
    rgba(42, 17, 72, 0.9),
    rgba(42, 17, 72, 0.35) 68%,
    rgba(7, 6, 11, 0) 100%
  );
}

.page-about .about-band--dark {
  background-image: linear-gradient(
    100deg,
    rgba(7, 6, 11, 0.9),
    rgba(58, 51, 80, 0.22) 70%,
    rgba(7, 6, 11, 0) 100%
  );
}

.page-about .about-head {
  margin-bottom: 20px;
}

.page-about .about-head .ra-section-head__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-head .ra-section-head__index {
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .about-head .ra-section-head__status {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--jade);
}

.page-about .about-prose {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--frost);
  opacity: 0.86;
  max-width: 44em;
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 28px;
}

.page-about .about-node:last-child {
  padding-bottom: 4px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 7px;
  height: 7px;
  background-color: var(--line);
  transform: rotate(45deg);
  transition: background-color var(--t) var(--ease);
}

.page-about .about-node:hover::before {
  background-color: var(--gold);
}

.page-about .about-node__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--lilac);
  max-width: 40em;
}

/* ---------- 分栏与数据清单 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-datalist {
  margin: 22px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-datalist__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-datalist__key {
  font-size: 14px;
  color: var(--lilac);
}

.page-about .about-datalist__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--gold-light);
}

.page-about .about-fig {
  margin: 0;
  border: 1px solid var(--line);
  background-color: rgba(7, 6, 11, 0.7);
  transition: border-color var(--t) var(--ease);
}

.page-about .about-fig:hover {
  border-color: var(--gold);
}

.page-about .about-fig .ra-frame__media {
  overflow: hidden;
}

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

.page-about .about-fig .ra-frame__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lilac);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .about-role {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--royal);
  background-color: rgba(42, 17, 72, 0.5);
  box-shadow: 6px 6px 0 rgba(3, 3, 7, 0.85);
  transition: border-left-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .about-role:hover {
  border-left-color: var(--gold);
  background-color: rgba(42, 17, 72, 0.72);
}

.page-about .about-role__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--gold-light);
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--frost);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--lilac);
}

.page-about .about-fig--band {
  margin-top: 28px;
}

/* ---------- 稳定标准 ---------- */
.page-about .about-standards {
  display: grid;
  gap: 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-standard {
  position: relative;
  padding: 0 0 0 46px;
}

.page-about .about-standard__idx {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
}

.page-about .about-standard__title {
  margin: 3px 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--frost);
}

.page-about .about-standard__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lilac);
  max-width: 40em;
}

/* ---------- 荣誉与伙伴 ---------- */
.page-about .about-honors {
  display: grid;
  gap: 18px;
  margin-bottom: 26px;
}

.page-about .about-honor {
  padding: 22px 20px;
  border: 2px solid var(--line);
  background-image: linear-gradient(150deg, rgba(42, 17, 72, 0.85), rgba(7, 6, 11, 0.4));
  outline: none;
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .about-honor:hover,
.page-about .about-honor:focus-visible {
  border-color: var(--gold);
  box-shadow: 8px 8px 0 rgba(3, 3, 7, 0.9);
}

.page-about .about-honor__tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--jade);
}

.page-about .about-honor__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.45;
  color: var(--gold-light);
}

.page-about .about-honor__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--lilac);
}

/* ---------- 收束带 ---------- */
.page-about .about-next {
  padding: 34px 20px 8px;
  border-top: 2px solid var(--gold);
  background-image: linear-gradient(100deg, rgba(27, 12, 51, 0.95), rgba(7, 6, 11, 0.6));
}

.page-about .about-next__title {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 21px;
  color: var(--frost);
}

.page-about .about-next__links {
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background-color: var(--obsidian);
  text-decoration: none;
  transition: background-color var(--t) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background-image: linear-gradient(120deg, var(--gold), var(--gold-light));
  background-color: var(--gold);
}

.page-about .about-next__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-next__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--frost);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--lilac);
}

.page-about .about-next__link:hover .about-next__idx,
.page-about .about-next__link:hover .about-next__name,
.page-about .about-next__link:hover .about-next__desc,
.page-about .about-next__link:focus-visible .about-next__idx,
.page-about .about-next__link:focus-visible .about-next__name,
.page-about .about-next__link:focus-visible .about-next__desc {
  color: var(--obsidian);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-metric {
    padding: 26px 20px;
  }

  .page-about .about-band {
    padding: 42px 34px 48px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
  }

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

  .page-about .about-standards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 32px;
  }

  .page-about .about-honors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    gap: 56px;
    padding: 60px 0 64px;
  }

  .page-about .about-cover {
    transform: translateY(-14px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
    padding-top: 40px;
    padding-bottom: 72px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
    padding: 48px 0 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    padding: 11px 12px;
    white-space: normal;
  }
}