.page-about {
  --about-rail-w: 296px;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: var(--white);
  padding-block: clamp(18px, 3vw, 32px) clamp(46px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -42%;
  width: clamp(260px, 46vw, 620px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 32% 32%, rgba(255, 106, 42, 0.34), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -16%;
  left: -9%;
  width: clamp(170px, 32vw, 400px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(127, 224, 195, 0.24);
  pointer-events: none;
}

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

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
  padding-top: clamp(16px, 3.4vw, 40px);
}

.page-about .about-hero__text .kicker {
  display: inline-block;
  margin: 0;
  padding: 5px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(127, 224, 195, 0.42);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
}

.page-about .about-hero .display-1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6.6vw, 4.1rem);
  line-height: 1.07;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 34em;
  font-size: clamp(0.94rem, 1.6vw, 1.04rem);
  line-height: 1.88;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-hero__actions {
  margin-top: clamp(22px, 3.4vw, 32px);
  flex-wrap: wrap;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid rgba(247, 242, 231, 0.18);
  background: var(--navy-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-layout {
  padding-block: clamp(38px, 6vw, 86px);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-block {
  padding-bottom: clamp(44px, 6vw, 80px);
  margin-bottom: clamp(44px, 6vw, 80px);
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-block__head {
  max-width: 42em;
}

.page-about .about-block__no {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--signal);
}

.page-about .about-block__head .display-2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--navy);
}

.page-about .about-block__head .lede {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(27, 23, 18, 0.76);
}

.page-about .about-block__figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--navy-2);
}

.page-about .about-block__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--signal), var(--mint));
  opacity: 0.4;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 42px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 18px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--signal);
  z-index: 1;
}

.page-about .about-timeline__fold {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-timeline__fold:hover {
  border-color: rgba(255, 106, 42, 0.5);
  box-shadow: 0 14px 26px -22px rgba(11, 31, 51, 0.6);
}

.page-about .about-timeline__fold .fold__summary {
  padding: 15px 46px 15px 16px;
  cursor: pointer;
  outline-offset: -2px;
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 9px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(255, 106, 42, 0.4);
  color: var(--signal);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  vertical-align: 1px;
}

.page-about .about-timeline__label {
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.5;
}

.page-about .about-timeline__fold .fold__body {
  padding: 0 16px 16px;
}

.page-about .about-timeline__fold .fold__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.88;
  color: rgba(27, 23, 18, 0.74);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  margin-top: clamp(22px, 3.6vw, 36px);
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-network__figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--navy-2);
}

.page-about .about-network__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-network__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  padding: 15px 13px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--white);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-stat:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 106, 42, 0.55);
  box-shadow: 0 16px 28px -20px rgba(11, 31, 51, 0.5);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3vw, 1.95rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 5px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--mint-deep);
}

.page-about .about-stat__note {
  margin: 10px 0 0;
  font-size: 0.79rem;
  line-height: 1.7;
  color: rgba(27, 23, 18, 0.62);
}

/* ---------- 深色方法章节 ---------- */
.page-about .about-block--ink {
  padding: clamp(24px, 4vw, 44px);
  border: 0;
  border-radius: var(--r-lg);
  background: var(--navy);
  color: var(--white);
}

.page-about .about-block--ink .about-block__head .display-2 {
  color: var(--white);
}

.page-about .about-block--ink .about-block__head .lede {
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-block--ink .about-block__no {
  color: var(--signal-soft);
}

.page-about .about-method {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  gap: 11px;
}

.page-about .about-method__item {
  padding: 17px 15px;
  border-radius: var(--r-md);
  border: 1px solid rgba(247, 242, 231, 0.16);
  background: var(--navy-2);
}

.page-about .about-method__item .mono {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--mint);
}

.page-about .about-method__item .title {
  margin: 9px 0 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.page-about .about-method__item p {
  margin: 8px 0 0;
  font-size: 0.87rem;
  line-height: 1.8;
  color: rgba(247, 242, 231, 0.74);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  gap: 16px;
}

.page-about .about-team__cell {
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--signal);
}

.page-about .about-team__cell strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.6vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--navy);
}

.page-about .about-team__cell span {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--mint-deep);
}

.page-about .about-team__cell p {
  margin: 9px 0 0;
  font-size: 0.85rem;
  line-height: 1.8;
  color: rgba(27, 23, 18, 0.7);
}

/* ---------- 价值观 ---------- */
.page-about .about-values__list {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-values__item {
  padding: 17px 15px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: var(--white);
}

.page-about .about-values__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-values__item p {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: rgba(27, 23, 18, 0.7);
}

/* ---------- 尾部行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(20px, 3.4vw, 32px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(125deg, rgba(255, 106, 42, 0.13), rgba(127, 224, 195, 0.2));
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-cta__text {
  flex: 1 1 260px;
  min-width: 0;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-cta__note {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(27, 23, 18, 0.72);
}

.page-about .about-cta .cluster {
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 右侧档案栏 ---------- */
.page-about .about-rail {
  margin-top: 34px;
  padding: 20px 18px 22px;
  border-radius: var(--r-lg);
  background: var(--navy);
  color: var(--white);
}

.page-about .about-rail .rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--mint);
}

.page-about .about-rail .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail .rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border-radius: var(--r-pill);
  font-size: 0.9rem;
  line-height: 1.4;
  color: rgba(247, 242, 231, 0.68);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-rail .rail__link::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.55;
}

.page-about .about-rail .rail__link:hover,
.page-about .about-rail .rail__link[aria-current="true"] {
  color: var(--white);
  background: rgba(127, 224, 195, 0.14);
}

.page-about .about-rail .rail__link[aria-current="true"]::before {
  background: var(--signal);
  opacity: 1;
}

.page-about .about-rail__stats {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(247, 242, 231, 0.14);
  display: grid;
  gap: 11px;
}

.page-about .about-rail__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-rail__row dt {
  font-family: var(--font-mono);
  font-size: 0.69rem;
  letter-spacing: 0.06em;
  color: rgba(247, 242, 231, 0.55);
}

.page-about .about-rail__row dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
  color: var(--white);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-method {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-network {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 5 / 6;
  }

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    gap: clamp(30px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    margin-top: 0;
    position: sticky;
    top: calc(var(--masthead-h) + 20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat,
  .page-about .about-timeline__fold,
  .page-about .about-rail .rail__link {
    transition: none;
  }

  .page-about .about-stat:hover {
    transform: none;
  }
}
<<<END>>>