.page-about {
  --about-shadow: 0 18px 40px rgba(11, 14, 12, .12);
  --about-gutter: 1.75rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2.5rem, 6vw, 4.5rem);
  background: var(--ink);
  color: var(--white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 18%;
  right: -18%;
  width: min(760px, 90vw);
  height: min(760px, 90vw);
  background: radial-gradient(closest-side, rgba(198, 255, 46, .16), rgba(47, 107, 255, .07) 58%, transparent 76%);
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3.25rem);
  margin-top: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
}

.page-about .about-hero__lead h1 {
  margin-block: .75rem .9rem;
}

.page-about .about-hero__lead .lede {
  color: rgba(255, 255, 255, .78);
  max-width: 34ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid rgba(255, 255, 255, .16);
  box-shadow: var(--about-shadow);
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem 1.4rem;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding: 1rem 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, .14);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-about .about-index a {
  display: inline-flex;
  gap: .45rem;
  align-items: baseline;
  color: rgba(255, 255, 255, .7);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-index a span {
  color: var(--blue);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--lime);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-chapter__side {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  line-height: .82;
  letter-spacing: -.05em;
  color: var(--line);
}

.page-about .about-chapter--dark .about-chapter__num {
  color: rgba(198, 255, 46, .24);
}

.page-about .about-chapter__annot {
  margin: .35rem 0 0;
  color: var(--muted);
}

.page-about .about-chapter--dark .about-chapter__annot {
  color: rgba(255, 255, 255, .55);
}

.page-about .about-chapter__body h2 {
  margin-block: .35rem .9rem;
}

.page-about .about-chapter__body p {
  max-width: 34ch;
}

.page-about .about-chapter__body p + p {
  margin-top: 1rem;
}

/* ---------- 品牌起点 ---------- */
.page-about .about-story {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-quote {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 1.25rem 0 1.25rem 1.25rem;
  border-left: 4px solid var(--lime);
  background: linear-gradient(90deg, rgba(198, 255, 46, .14), transparent 70%);
}

.page-about .about-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-style: normal;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-sec {
  background: var(--console);
  color: var(--white);
}

.page-about .about-timeline-sec .lede {
  color: rgba(255, 255, 255, .74);
}

.page-about .about-timeline {
  position: relative;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0 0 0 var(--about-gutter);
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--blue) 55%, var(--orange));
  opacity: .6;
}

.page-about .tl-node {
  position: relative;
  padding-bottom: clamp(1.5rem, 4vw, 2.25rem);
  outline: none;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: calc(var(--about-gutter) * -1);
  top: .3rem;
  width: 14px;
  height: 14px;
  background: var(--console);
  border: 2px solid var(--lime);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-visible::before {
  background: var(--lime);
}

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

.page-about .tl-node__season {
  margin: 0 0 .35rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .tl-node__title {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--white);
}

.page-about .tl-node__text {
  margin: 0;
  max-width: 46ch;
  font-size: .95rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .74);
}

.page-about .tl-node__more {
  margin: 0;
  max-width: 46ch;
  font-size: .88rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .5);
  border-left: 1px solid rgba(255, 255, 255, .22);
  padding-left: .75rem;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  box-shadow: var(--about-shadow);
}

.page-about .about-team__body h2 {
  margin-block: .5rem 1rem;
}

.page-about .about-team__body p {
  max-width: 34ch;
}

.page-about .about-team__body p + p {
  margin-top: 1rem;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: clamp(1rem, 3vw, 1.35rem);
  background: var(--paper);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 2.9rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ink);
  border-bottom: 3px solid var(--lime);
  align-self: flex-start;
  padding-bottom: .25rem;
}

.page-about .about-stats__label {
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 内容生产 ---------- */
.page-about .about-process {
  background: var(--paper-deep);
  color: var(--ink);
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  padding-top: 1rem;
  border-top: 2px solid var(--ink);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .16em;
  color: var(--blue);
}

.page-about .about-step__title {
  margin: .4rem 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-step p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.62;
  color: var(--muted);
}

.page-about .about-cadence {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  border: 1px solid var(--line);
  background: var(--paper);
}

.page-about .about-cadence .panel__body {
  padding-top: 0;
}

.page-about .about-cadence .data-row {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem 1rem;
  justify-content: space-between;
  padding: .8rem 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence .data-row__label {
  font-size: .9rem;
  color: var(--muted);
}

.page-about .about-cadence .data-row__value {
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 本地观赛 ---------- */
.page-about .about-local {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}

.page-about .about-local::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--orange), var(--lime) 45%, var(--blue));
}

.page-about .about-local__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-local__body h2 {
  margin-block: .5rem 1rem;
}

.page-about .about-local__body .lede {
  color: rgba(255, 255, 255, .8);
}

.page-about .about-local__body p + p {
  margin-top: 1rem;
  color: rgba(255, 255, 255, .68);
  max-width: 34ch;
}

.page-about .about-local__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.5rem 0 1.75rem;
  padding: 0;
  list-style: none;
}

.page-about .about-local__media {
  margin: 0;
  border: 1px solid rgba(255, 255, 255, .14);
  box-shadow: var(--about-shadow);
}

/* ---------- 长期合作 ---------- */
.page-about .about-why {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-why h2 {
  margin-block: .5rem 2rem;
  max-width: 22ch;
}

.page-about .about-why__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-why__item {
  padding: clamp(1.1rem, 3vw, 1.6rem) clamp(1.1rem, 3vw, 1.6rem) clamp(1.2rem, 3vw, 1.75rem);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 var(--paper-deep);
}

.page-about .about-why__num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--blue);
}

.page-about .about-why__title {
  margin: .45rem 0 .55rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-why__item p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.62;
  color: var(--muted);
}

.page-about .about-why__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.page-about .about-why__cta p {
  margin: 0;
  max-width: 46ch;
  font-size: .92rem;
  color: var(--muted);
}

.page-about .about-why__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestone {
  background: var(--console);
  color: var(--white);
}

.page-about .about-milestone__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-milestone__mark {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding: 1.25rem 1.25rem 1.5rem;
  border: 1px solid rgba(198, 255, 46, .35);
  background: linear-gradient(160deg, rgba(198, 255, 46, .1), transparent 65%);
}

.page-about .about-milestone__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(3rem, 11vw, 6rem);
  line-height: .85;
  letter-spacing: -.05em;
  color: var(--lime);
}

.page-about .about-milestone__yearlabel {
  font-size: .82rem;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .7);
}

.page-about .about-milestone__body h2 {
  margin-block: .5rem 1.5rem;
}

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

.page-about .about-milestone__list li {
  padding: .95rem 0;
  border-top: 1px solid rgba(255, 255, 255, .14);
}

.page-about .about-milestone__k {
  display: inline-block;
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .about-milestone__list p {
  margin: 0;
  max-width: 46ch;
  font-size: .93rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .75);
}

.page-about .about-milestone__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem 1.5rem;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 1.25rem 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, .18);
}

.page-about .about-milestone__stats li {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.page-about .about-milestone__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-milestone__unit {
  font-size: .78rem;
  letter-spacing: .05em;
  color: rgba(255, 255, 255, .58);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-chapter {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-chapter__side {
    flex-direction: column;
    gap: 1.25rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .about-milestone__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-milestone__mark {
    position: sticky;
    top: 7rem;
  }
}

@media (hover: hover) and (min-width: 820px) {
  .page-about .tl-node__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
  }

  .page-about .tl-node:hover .tl-node__more,
  .page-about .tl-node:focus-within .tl-node__more {
    max-height: 6rem;
    margin-top: .6rem;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node__more,
  .page-about .tl-node::before {
    transition: none;
  }

  .page-about .about-milestone__mark {
    position: static;
  }
}