.page-about {
  --about-sticky: 110px;
  background: var(--clr-paper);
  color: var(--clr-ink);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.85;
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--clr-paper);
  background:
    radial-gradient(110% 85% at 88% -15%, rgba(201, 162, 75, 0.32), transparent 62%),
    linear-gradient(158deg, var(--clr-primary) 0%, #0a3446 58%, var(--clr-deep) 100%);
  border-bottom: var(--line-gold);
}

.page-about .about-hero__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(1.25rem, 4vw, 2rem) var(--gutter) clamp(2.5rem, 5vw, 4.25rem);
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  list-style: none;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  padding: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--clr-haze);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 0.55rem;
  color: var(--clr-gold);
}

.page-about .about-crumb a {
  color: var(--clr-gold-hi);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--clr-gold-hi);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: end;
}

.page-about .about-kicker {
  margin: 0 0 1rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.28em;
  color: var(--clr-gold-hi);
}

.page-about .about-hero h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.4vw, 4.15rem);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--clr-paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(1rem, 1.7vw, 1.15rem);
  line-height: 1.9;
  color: var(--clr-haze);
}

.page-about .about-hero__mark {
  border: 2px solid var(--clr-gold);
  background: rgba(11, 17, 22, 0.34);
  box-shadow: 6px 6px 0 0 rgba(201, 162, 75, 0.55);
  padding: 1.1rem 1.25rem;
}

.page-about .about-mark__line {
  margin: 0;
  font-size: var(--fs-sm);
  letter-spacing: 0.08em;
  color: var(--clr-paper);
}

.page-about .about-mark__line + .about-mark__line {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(201, 162, 75, 0.4);
}

/* ---------- 版式骨架 ---------- */
.page-about .about-layout {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: clamp(1.5rem, 3vw, 2.5rem) clamp(2rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 3vw, 2rem);
}

.page-about .about-toc {
  border-top: 2px solid var(--clr-gold);
  padding-top: 0.8rem;
}

.page-about .about-toc__title {
  margin: 0 0 0.6rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.28em;
  color: var(--clr-primary);
}

.page-about .about-toc__list {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list a {
  display: inline-block;
  padding: 0.55rem 0.2rem;
  min-height: 44px;
  white-space: nowrap;
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  color: var(--clr-primary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--clr-cinnabar);
  border-bottom-color: var(--clr-gold);
}

/* ---------- 章节 ---------- */
.page-about .about-body > .about-sec {
  padding-block: clamp(2.25rem, 4.5vw, 3.5rem);
  border-top: 1px solid var(--clr-mist);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  padding-top: 0.5rem;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: baseline;
  margin-bottom: 0.9rem;
}

.page-about .about-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5vw, 3.1rem);
  line-height: 0.95;
  color: var(--clr-gold);
  text-shadow: 3px 3px 0 rgba(14, 74, 99, 0.18);
  font-variant-numeric: tabular-nums;
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--clr-primary);
}

.page-about .about-sec__lede {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  font-size: var(--fs-md);
  line-height: 1.7;
  color: #2a3d45;
}

.page-about .about-text p {
  margin: 0 0 1.15rem;
  max-width: 62ch;
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: start;
}

.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--clr-ink);
  box-shadow: var(--shadow-hard);
  background: var(--clr-mist);
}

.page-about .about-quote {
  margin: 1.5rem 0 0;
  padding: 1.1rem 1.25rem;
  border-left: 4px solid var(--clr-cinnabar);
  background: rgba(220, 227, 228, 0.42);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-md);
  line-height: 1.65;
  letter-spacing: 0.05em;
  color: var(--clr-primary);
}

/* ---------- 时间轴深色带 ---------- */
.page-about .about-body > .about-band {
  background: var(--clr-deep);
  color: var(--clr-paper);
  border-top: var(--line-gold);
  border-bottom: var(--line-gold);
  padding: clamp(2rem, 4vw, 3rem) clamp(1.1rem, 3vw, 2.25rem);
}

.page-about .about-band .about-sec__title {
  color: var(--clr-paper);
}

.page-about .about-band .about-num {
  color: var(--clr-gold-hi);
  text-shadow: 3px 3px 0 rgba(178, 58, 46, 0.55);
}

.page-about .about-band .about-sec__lede {
  color: var(--clr-haze);
  font-size: var(--fs-base);
}

.page-about .about-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-timeline .accordion__item {
  position: relative;
  border: 0;
  background: transparent;
  padding: 0.95rem 0 0;
  border-top: 4px solid var(--clr-gold);
  align-self: start;
}

.page-about .about-timeline .accordion__item::before {
  content: "";
  position: absolute;
  top: -9px;
  left: 0;
  width: 14px;
  height: 14px;
  background: var(--clr-gold-hi);
  box-shadow: 3px 3px 0 0 var(--clr-cinnabar);
}

.page-about .about-timeline .accordion__trigger {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  width: 100%;
  min-height: 44px;
  padding: 0.35rem 0 0.5rem;
  background: transparent;
  border: 0;
  color: var(--clr-paper);
  font-family: var(--font-display);
  text-align: left;
  cursor: pointer;
  transition: color var(--ease);
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 4.2vw, 2.6rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--clr-gold-hi);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__label {
  font-size: var(--fs-base);
  letter-spacing: 0.14em;
  color: var(--clr-paper);
  transition: color var(--ease);
}

.page-about .about-timeline .accordion__trigger:hover .about-timeline__label,
.page-about .about-timeline .accordion__trigger:focus-visible .about-timeline__label,
.page-about .about-timeline .accordion__trigger[aria-expanded="true"] .about-timeline__label {
  color: var(--clr-gold-hi);
}

.page-about .about-timeline__body {
  padding: 0 0 0.4rem;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--clr-haze);
}

.page-about .about-band__figure {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  border: 2px solid var(--clr-gold);
  box-shadow: 6px 6px 0 0 rgba(201, 162, 75, 0.5);
}

/* ---------- 团队 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.page-about .about-flow li {
  padding: 0 0 1.1rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--clr-mist);
}

.page-about .about-flow li:last-child {
  border-bottom: 0;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
}

.page-about .about-flow h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--clr-jade);
}

.page-about .about-flow p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: #24343b;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .about-cadence__card {
  border: 2px solid var(--clr-ink);
  box-shadow: var(--shadow-hard);
  background: rgba(201, 162, 75, 0.1);
  padding: 1.15rem 1.2rem 1.3rem;
}

.page-about .about-cadence__cycle {
  margin: 0 0 0.35rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.3em;
  color: var(--clr-cinnabar);
}

.page-about .about-cadence__head {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-md);
  letter-spacing: 0.04em;
  color: var(--clr-primary);
}

.page-about .about-cadence__card p:last-child {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
}

.page-about .about-note {
  margin: 1.5rem 0 0;
  padding-left: 1rem;
  border-left: 3px solid var(--clr-jade);
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: #24343b;
}

/* ---------- 合作与地区 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.page-about .about-partners li {
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--clr-mist);
}

.page-about .about-partners h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-size: var(--fs-base);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--clr-primary);
}

.page-about .about-partners p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: #24343b;
}

.page-about .about-aside {
  border: 2px solid var(--clr-gold);
  background: var(--clr-deep);
  color: var(--clr-paper);
  padding: 1.25rem 1.3rem 1.4rem;
  box-shadow: var(--shadow-gold);
}

.page-about .about-aside__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-base);
  letter-spacing: 0.06em;
  color: var(--clr-gold-hi);
}

.page-about .about-aside ul {
  margin: 0 0 1.1rem;
  padding-left: 1.1rem;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--clr-haze);
}

.page-about .about-aside li + li {
  margin-top: 0.4rem;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .about-next li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--clr-mist);
}

.page-about .about-next__mark {
  width: 12px;
  height: 12px;
  margin-top: 0.55rem;
  background: var(--clr-cinnabar);
  box-shadow: 3px 3px 0 0 var(--clr-gold);
}

.page-about .about-next h3 {
  margin: 0 0 0.25rem;
  font-family: var(--font-display);
  font-size: var(--fs-base);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--clr-primary);
}

.page-about .about-next p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: #24343b;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(2rem, 4vw, 3rem);
  background:
    linear-gradient(150deg, var(--clr-primary) 0%, #0c3a4e 70%, var(--clr-deep) 100%);
  border: 2px solid var(--clr-gold);
  box-shadow: 6px 6px 0 0 var(--clr-gold);
  color: var(--clr-paper);
}

.page-about .about-cta__inner {
  padding: clamp(1.6rem, 4vw, 2.75rem);
}

.page-about .about-cta__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  line-height: 1.3;
  letter-spacing: 0.03em;
  color: var(--clr-paper);
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: var(--clr-haze);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-cta__actions .btn {
  min-height: 44px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(1.5rem, 4vw, 3rem);
  }

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

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem 1.75rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-cols--5-3 {
    grid-template-columns: minmax(0, 5fr) minmax(0, 3fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .about-cols--3-5 {
    grid-template-columns: minmax(0, 3fr) minmax(0, 5fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(1rem, 2vw, 1.6rem);
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(1.75rem, 3.5vw, 3.25rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: var(--about-sticky);
    align-self: start;
  }

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

  .page-about .about-toc__list a {
    display: block;
    width: 100%;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--clr-mist);
    letter-spacing: 0.08em;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    border-bottom-color: var(--clr-gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crumb a,
  .page-about .about-toc__list a,
  .page-about .about-timeline .accordion__trigger,
  .page-about .about-timeline__label {
    transition: none;
  }
}
<<<END>>>