.page-about {
  --about-gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about :focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-about section[id] {
  scroll-margin-top: 6rem;
}

/* ---------- 报头式开场 ---------- */

.page-about .about-masthead {
  position: relative;
  text-align: center;
  padding-block: clamp(1.75rem, 5vw, 3rem) clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-masthead .eyebrow {
  display: inline-block;
  color: var(--grey);
}

.page-about .about-masthead__title {
  margin: .7rem auto 0;
  max-width: 18ch;
  font-size: clamp(2rem, 8.6vw, 4.5rem);
  line-height: 1.03;
  font-weight: 900;
  letter-spacing: -.03em;
  color: var(--ivory);
  transform: skewY(-2.5deg);
}

.page-about .about-masthead__lede {
  margin: 1.5rem auto 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(245, 242, 236, .78);
}

.page-about .about-masthead__rule {
  height: 1px;
  max-width: 32rem;
  margin: 2rem auto 0;
  background: linear-gradient(90deg, transparent, var(--milan-red), transparent);
}

.page-about .about-masthead__marks {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .55rem;
}

.page-about .about-masthead__marks li {
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--grey);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .32rem .78rem;
  background: rgba(245, 242, 236, .03);
}

/* ---------- 页内小节导航 ---------- */

.page-about .about-jump {
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding-block: .9rem;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-jump::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump__link {
  flex: 0 0 auto;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--ivory);
  text-decoration: none;
  padding: .42rem .92rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(245, 242, 236, .03);
  transition: border-color .22s ease, background-color .22s ease, transform .22s ease;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--milan-red);
  background: rgba(200, 16, 46, .18);
  transform: translateY(-2px);
}

/* ---------- 错位图文流 ---------- */

.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-split__body {
  min-width: 0;
}

.page-about .about-prose {
  margin: 1rem 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(245, 242, 236, .82);
}

.page-about .about-prose + .about-prose {
  margin-top: .9rem;
}

.page-about .media-frame__inner {
  overflow: hidden;
  border-radius: var(--radius-m);
}

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

@media (min-width: 900px) {
  .page-about .about-split--text-first {
    grid-template-columns: 1.15fr .85fr;
  }

  .page-about .about-split--media-first {
    grid-template-columns: .85fr 1.15fr;
  }

  .page-about .about-split--media-first .about-split__media {
    transform: translateY(1.75rem);
  }
}

/* ---------- 球队库索引树 ---------- */

.page-about .index-tree {
  margin-top: 1.6rem;
}

.page-about .index-tree__term {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.page-about .index-tree .fold__panel p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.72;
  color: rgba(245, 242, 236, .78);
}

/* ---------- 一周节奏 ---------- */

.page-about .week-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .week-list__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.2rem 1.25rem 1.35rem;
  background: linear-gradient(160deg, var(--ink-2), var(--ink-3));
}

.page-about .week-list__time {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--green);
}

.page-about .week-list__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ivory);
}

.page-about .week-list__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.68;
  color: rgba(245, 242, 236, .72);
}

@media (min-width: 820px) {
  .page-about .week-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 团队 ---------- */

.page-about .crew-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .crew-list__item {
  position: relative;
  padding: .95rem 1.05rem .95rem 2.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: rgba(11, 11, 15, .35);
}

.page-about .crew-list__item::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 1.35rem;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--milan-red);
}

.page-about .crew-list__item:nth-child(2)::before {
  background: var(--blue);
}

.page-about .crew-list__item:nth-child(3)::before {
  background: var(--green);
}

.page-about .crew-list__name {
  margin: 0;
  font-size: .98rem;
  font-weight: 800;
  color: var(--ivory);
}

.page-about .crew-list__text {
  margin: .3rem 0 0;
  font-size: .9rem;
  line-height: 1.68;
  color: rgba(245, 242, 236, .74);
}

/* ---------- 纵向时间线 ---------- */

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0 0 0 1.6rem;
  display: grid;
  gap: 1.1rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: .32rem;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), var(--milan-red) 45%, var(--indigo));
}

.page-about .timeline__item {
  position: relative;
  padding: 1rem 1.1rem 1.1rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, rgba(35, 35, 43, .72), rgba(22, 22, 28, .72));
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.3rem;
  width: .7rem;
  height: .7rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, .14);
}

.page-about .timeline__item:hover {
  border-color: rgba(200, 16, 46, .55);
  transform: translateX(3px);
}

.page-about .timeline__version {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin: .35rem 0 0;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ivory);
}

.page-about .timeline__summary {
  margin: .35rem 0 0;
  font-size: .92rem;
  line-height: 1.68;
  color: rgba(245, 242, 236, .78);
}

.page-about .timeline__detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .35s ease, opacity .25s ease, margin-top .35s ease;
}

.page-about .timeline__item:hover .timeline__detail,
.page-about .timeline__item:focus-within .timeline__detail,
.page-about .timeline__item:focus .timeline__detail {
  max-height: 14rem;
  opacity: 1;
  margin-top: .65rem;
}

.page-about .timeline__detail p {
  margin: 0;
  padding-left: .85rem;
  border-left: 2px solid var(--blue);
  font-size: .9rem;
  line-height: 1.72;
  color: rgba(245, 242, 236, .72);
}

@media (hover: none) {
  .page-about .timeline__detail {
    max-height: none;
    opacity: 1;
    margin-top: .65rem;
  }
}

/* ---------- 数据条 ---------- */

.page-about .stats-band {
  margin-top: 2rem;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .stats-band__cell {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1.35rem 1.2rem 1.5rem;
  background: linear-gradient(160deg, var(--ink-2), var(--ink-3));
}

.page-about .stats-band__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--green);
}

.page-about .stats-band__cell:nth-child(2) .stats-band__num {
  color: var(--blue);
}

.page-about .stats-band__cell:nth-child(3) .stats-band__num {
  color: var(--gold);
}

.page-about .stats-band__cell:nth-child(4) .stats-band__num {
  color: var(--ivory);
}

.page-about .stats-band__label {
  font-size: .85rem;
  letter-spacing: .04em;
  color: var(--grey);
}

@media (min-width: 720px) {
  .page-about .stats-band {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 收束链接 ---------- */

.page-about .about-next {
  display: grid;
  gap: 1.75rem;
}

@media (min-width: 860px) {
  .page-about .about-next {
    grid-template-columns: .9fr 1.1fr;
    align-items: start;
    gap: 2.5rem;
  }
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: rgba(11, 11, 15, .3);
  color: var(--ivory);
  font-size: .97rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .22s ease, background-color .22s ease, transform .22s ease;
}

.page-about .about-next__link::after {
  content: "→";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  color: var(--milan-red);
  transition: transform .22s ease, color .22s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--milan-red);
  background: rgba(200, 16, 46, .16);
  transform: translateY(-3px);
}

.page-about .about-next__link:hover::after,
.page-about .about-next__link:focus-visible::after {
  transform: translateX(4px);
  color: var(--green);
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__detail,
  .page-about .timeline__item,
  .page-about .about-jump__link,
  .page-about .about-next__link,
  .page-about .about-next__link::after {
    transition: none;
  }

  .page-about .timeline__item:hover,
  .page-about .about-jump__link:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }
}