.page-about {
  --about-rail-w: 200px;
  position: relative;
  background-color: var(--night);
  background-image:
    linear-gradient(to bottom, rgba(11, 42, 34, 0.85) 0, rgba(10, 20, 40, 0) 520px),
    linear-gradient(to right, rgba(47, 74, 66, 0.18) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 74, 66, 0.12) 1px, transparent 1px);
  background-size: 100% 520px, 64px 64px, 64px 64px;
  background-repeat: no-repeat, repeat, repeat;
  background-position: 0 0, 0 0, 0 0;
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(30px, 4.5vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 20ch;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin-top: 20px;
  color: var(--muted);
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.8;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__stat {
  background: var(--deep-green);
  padding: clamp(14px, 1.8vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--digit);
}

.page-about .about-hero__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: clamp(26px, 4vw, 48px);
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

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

/* ---------- 左侧章节索引 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

@media (min-width: 1040px) {
  .page-about .about-rail {
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 132px;
  }
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

@media (min-width: 1040px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  background: rgba(16, 53, 43, 0.6);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

@media (min-width: 1040px) {
  .page-about .about-rail__list {
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__link {
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding: 11px 10px 11px 14px;
  }
}

.page-about .about-shell:has(#start[data-active="true"]) .about-rail__link[href="#start"],
.page-about .about-shell:has(#timeline[data-active="true"]) .about-rail__link[href="#timeline"],
.page-about .about-shell:has(#data[data-active="true"]) .about-rail__link[href="#data"],
.page-about .about-shell:has(#team[data-active="true"]) .about-rail__link[href="#team"],
.page-about .about-shell:has(#reach[data-active="true"]) .about-rail__link[href="#reach"],
.page-about .about-shell:has(#partners[data-active="true"]) .about-rail__link[href="#partners"],
.page-about .about-shell:has(#rhythm[data-active="true"]) .about-rail__link[href="#rhythm"] {
  color: var(--ink);
  border-color: var(--lime);
  background: rgba(140, 255, 102, 0.07);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: 130px;
  padding: clamp(26px, 3.6vw, 44px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-chapter .section-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -0.005em;
  margin: 8px 0 0;
  max-width: 24ch;
  color: var(--ink);
}

.page-about .about-chapter .lede {
  margin-top: 16px;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.8;
  font-size: 1rem;
}

.page-about .prose p {
  margin: 16px 0 0;
  max-width: 64ch;
  color: var(--muted);
  line-height: 1.85;
  font-size: 1rem;
}

.page-about .prose p:first-child {
  margin-top: 18px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 42%, var(--line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  background: var(--night);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-timeline__desc {
  margin: 8px 0 0;
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.9375rem;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
  border: 1px solid var(--line);
  background: var(--deep-green);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.84);
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: rgba(11, 42, 34, 0.65);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 键值数据行 ---------- */
.page-about .kv {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .kv .kv__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .kv .kv__row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

.page-about .kv .kv__k {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .kv .kv__v {
  margin: 0;
  color: var(--ink);
  line-height: 1.75;
  font-size: 0.9375rem;
}

/* ---------- 团队折叠 ---------- */
.page-about .about-teams {
  margin-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-team {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(16, 53, 43, 0.55) 0%, rgba(16, 53, 43, 0.1) 62%, rgba(10, 20, 40, 0) 100%);
}

.page-about .about-team__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 14px 16px 4px;
  cursor: pointer;
  list-style: none;
  color: var(--ink);
}

.page-about .about-team__head::-webkit-details-marker {
  display: none;
}

.page-about .about-team__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team[open] .about-team__head::after {
  content: "–";
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-team__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
}

.page-about .about-team__body {
  padding: 0 14px 18px 4px;
  max-width: 64ch;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.85;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 860px) {
  .page-about .about-reach {
    grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, 1.15fr);
  }
}

.page-about .about-reach__cell {
  background: var(--panel);
  padding: clamp(18px, 2.4vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--digit);
}

.page-about .about-reach__unit {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--gold);
}

.page-about .about-reach__cell p {
  margin: 10px 0 0;
  max-width: 40ch;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .about-reach__cell--note {
  background: var(--deep-green);
  gap: 2px;
}

.page-about .about-reach__k {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-reach__cell--note .about-reach__k:first-child {
  margin-top: 0;
}

.page-about .about-reach__v {
  margin: 4px 0 0;
  color: var(--ink);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ---------- 荣誉 ---------- */
.page-about .about-awards {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 680px) {
  .page-about .about-awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-awards__item {
  background: var(--indigo);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-awards__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-awards__name {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--ink);
}

/* ---------- 起点入口 ---------- */
.page-about .about-next {
  margin-top: 30px;
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--lime);
  background: linear-gradient(120deg, rgba(11, 42, 34, 0.85) 0%, rgba(10, 20, 40, 0) 80%);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  color: var(--ink);
}

.page-about .about-next__links {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 分区强调 ---------- */
.page-about #data {
  position: relative;
  padding-left: clamp(16px, 3.2vw, 30px);
}

.page-about #data::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(26px, 3.6vw, 44px);
  bottom: clamp(26px, 3.6vw, 44px);
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(140, 255, 102, 0));
}

.page-about #partners {
  position: relative;
  padding-left: clamp(16px, 3.2vw, 30px);
}

.page-about #partners::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(26px, 3.6vw, 44px);
  bottom: clamp(26px, 3.6vw, 44px);
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--wine));
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    transition: opacity 0.5s ease, transform 0.5s ease;
  }

  .page-about [data-reveal][data-reveal-state="idle"] {
    opacity: 0;
    transform: translateY(8px);
  }

  .page-about [data-reveal][data-reveal-state="in"] {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about [data-reveal] {
    transition: none;
  }
}
<<<END>>>