.page-about {
  --about-max: var(--wrap);
  --about-dark-line: rgba(44, 90, 79, 0.6);
  --about-rule: rgba(16, 34, 29, 0.14);
  --about-soft: #C7D8CE;
  --about-ink-soft: #263B34;
  background: var(--paper);
  color: var(--ink-text);
  font-family: var(--font-body);
}

/* ---------- 首屏档案封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--mint);
  padding: clamp(20px, 3.5vw, 34px) var(--gut) clamp(48px, 7vw, 88px);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(44, 90, 79, 0.45) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(44, 90, 79, 0.22) 0 1px, transparent 1px 96px);
  pointer-events: none;
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
  max-width: var(--about-max);
  margin-inline: auto;
}

.page-about .about-cover .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 54px);
}

.page-about .about-cover .breadcrumb__link {
  color: var(--mute);
  text-decoration: none;
}

.page-about .about-cover .breadcrumb__link:hover,
.page-about .about-cover .breadcrumb__link:focus-visible {
  color: var(--cyan);
}

.page-about .about-cover .breadcrumb__item {
  color: var(--mint);
  font-size: 0.8125rem;
}

.page-about .about-cover__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-cover__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 7.4vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--mint);
  max-width: 18ch;
}

.page-about .about-cover__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-cover__lead {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(0.9375rem, 1.6vw, 1.0625rem);
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-cover__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-dark-line);
  border: 1px solid var(--about-dark-line);
}

.page-about .about-cover__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--ink);
  padding: 18px 16px;
}

.page-about .about-cover__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-cover__fact-txt {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--mute);
}

@media (min-width: 620px) {
  .page-about .about-cover__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 运营脉络 ---------- */
.page-about .about-lead {
  padding: clamp(48px, 8vw, 96px) var(--gut);
  background: var(--paper);
}

.page-about .about-lead__grid {
  max-width: var(--about-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 60px);
}

.page-about .about-lead__main h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink-text);
  max-width: 20ch;
}

.page-about .about-lead__main p {
  margin: 0 0 18px;
  max-width: 36em;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

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

.page-about .about-lead__note {
  background: var(--deep);
  border-left: 4px solid var(--orange);
  padding: 22px 20px;
  color: var(--mint);
}

.page-about .about-lead__note-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-lead__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: baseline;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--mint);
}

.page-about .about-step__n {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-lead__note p {
  margin: 16px 0 0;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--about-soft);
}

@media (min-width: 900px) {
  .page-about .about-lead__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
  }
}

/* ---------- 三级内容骨架 ---------- */
.page-about .about-tiers {
  background: var(--deep);
  color: var(--mint);
  padding: clamp(48px, 8vw, 96px) var(--gut);
}

.page-about .about-tiers__inner {
  max-width: var(--about-max);
  margin-inline: auto;
}

.page-about .about-tiers__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-tiers .eyebrow,
.page-about .about-timeline .eyebrow {
  color: var(--cyan);
}

.page-about .about-tiers__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--mint);
  max-width: 16ch;
}

.page-about .about-tiers__lede {
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--about-soft);
  max-width: 40em;
}

@media (min-width: 900px) {
  .page-about .about-tiers__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    column-gap: clamp(28px, 5vw, 64px);
  }
}

.page-about .about-tiers__figure {
  margin: 0 0 clamp(26px, 4vw, 42px);
  border: 1px solid var(--line);
}

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

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

.page-about .about-tier {
  background: var(--deep);
  padding: clamp(20px, 3vw, 30px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background var(--t-mid) var(--ease);
}

.page-about .about-tier:hover {
  background: var(--card);
}

.page-about .about-tier__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-tier h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.375rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--mint);
}

.page-about .about-tier p {
  margin: 0;
  flex: 1;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-tier__stat {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

@media (min-width: 820px) {
  .page-about .about-tiers__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  padding: clamp(48px, 8vw, 96px) var(--gut);
  background: var(--paper);
}

.page-about .about-team__grid {
  max-width: var(--about-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--about-rule);
}

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

.page-about .about-team__body h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink-text);
  max-width: 18ch;
}

.page-about .about-team__body > p {
  margin: 0 0 20px;
  max-width: 38em;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-team__role {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  background: var(--paper);
}

.page-about .about-team__k {
  font-size: 0.875rem;
  color: var(--ink-text);
}

.page-about .about-team__v {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  color: var(--wine);
}

.page-about .about-team__foot {
  margin: 0;
  max-width: 38em;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--mute-ink);
}

@media (min-width: 560px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  background: var(--ink);
  color: var(--mint);
  padding: clamp(48px, 8vw, 96px) var(--gut);
}

.page-about .about-timeline__inner {
  max-width: var(--about-max);
  margin-inline: auto;
}

.page-about .about-timeline h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .about-timeline__lede {
  margin: 0 0 clamp(22px, 3.5vw, 32px);
  max-width: 46em;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-timeline__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-timeline__jump a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mute);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 6px 13px;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-timeline__jump a:hover,
.page-about .about-timeline__jump a:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-timeline__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(24px, 4vw, 36px) 34px;
  scroll-margin-top: 120px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 5px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-tl__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-tl h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mint);
}

.page-about .about-tl p {
  margin: 0;
  max-width: 44ch;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: var(--about-soft);
}

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

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

@media (min-width: 980px) {
  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

/* ---------- 合作生态与荣誉 ---------- */
.page-about .about-eco {
  background: var(--mint);
  padding: clamp(48px, 8vw, 96px) var(--gut);
}

.page-about .about-eco__inner {
  max-width: var(--about-max);
  margin-inline: auto;
}

.page-about .about-eco h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink-text);
  max-width: 20ch;
}

.page-about .about-eco__lede {
  margin: 0 0 clamp(26px, 4vw, 40px);
  max-width: 46em;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-fold {
  background: var(--paper);
  border: 1px solid rgba(16, 34, 29, 0.16);
  margin-bottom: 12px;
}

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

.page-about .about-fold__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--ink-text);
}

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

.page-about .about-fold__sum::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--wine);
  transition: transform var(--t-mid) var(--ease);
}

.page-about .about-fold[open] .about-fold__sum::after {
  transform: rotate(45deg);
}

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

.page-about .about-fold__body {
  padding: 0 18px 18px;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-fold__body p {
  margin: 0 0 12px;
}

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

.page-about .about-honor {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-honor__item {
  background: var(--ink);
  color: var(--mint);
  border-left: 4px solid var(--orange);
  padding: 20px;
}

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-honor__item h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mint);
}

.page-about .about-honor__item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--about-soft);
}

@media (min-width: 900px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

/* ---------- 服务规模 ---------- */
.page-about .about-scale {
  background: var(--indigo);
  color: var(--mint);
  padding: clamp(48px, 8vw, 88px) var(--gut);
}

.page-about .about-scale__inner {
  max-width: var(--about-max);
  margin-inline: auto;
}

.page-about .about-scale .eyebrow {
  color: var(--cyan);
}

.page-about .about-scale h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--mint);
  max-width: 18ch;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 38px);
  background: rgba(231, 239, 232, 0.24);
  border: 1px solid rgba(231, 239, 232, 0.24);
}

.page-about .about-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--indigo);
  padding: 22px 18px;
}

.page-about .about-scale__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-scale__num small {
  font-size: 0.5em;
  letter-spacing: 0;
}

.page-about .about-scale__label {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: #D8DCF0;
}

.page-about .about-scale__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 46em;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: #C6CBE6;
}

@media (min-width: 700px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  background: var(--paper);
  padding: clamp(48px, 8vw, 96px) var(--gut);
}

.page-about .about-next__panel {
  max-width: var(--about-max);
  margin-inline: auto;
  background: var(--ink);
  color: var(--mint);
  border-top: 8px solid var(--orange);
  padding: clamp(26px, 5vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-next__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-next__panel h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 34em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: center;
}

.page-about .about-next__sub {
  max-width: var(--about-max);
  margin: 20px auto 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--mute-ink);
}

.page-about .about-next__sub a {
  color: var(--wine);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

@media (min-width: 900px) {
  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-tier,
  .page-about .about-fold__sum::after,
  .page-about .about-timeline__jump a {
    transition: none;
  }
  .page-about .about-tl__item {
    scroll-margin-top: 24px;
  }
}
<<<END>>>