.page-about {
  --about-card-r: 16px;
  --about-line: 1px solid var(--line-dark);
  --about-line-invert: 1px solid var(--line-light);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(61, 224, 208, 0.35);
  border-radius: var(--r-sm);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--sea);
  color: var(--paper);
  padding: clamp(1.25rem, 4vw, 2rem) 0 clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 34%, var(--coral) 34%, var(--coral) 100%);
  z-index: 3;
}

.page-about .about-hero__shape {
  position: absolute;
  display: block;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero__shape--a {
  top: -22%;
  right: -30%;
  width: min(120vw, 620px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(155deg, var(--sea-lift), rgba(11, 59, 92, 0));
  clip-path: polygon(100% 0, 100% 100%, 18% 100%, 66% 34%);
  opacity: 0.9;
}

.page-about .about-hero__shape--b {
  bottom: 8%;
  left: -18%;
  width: min(70vw, 380px);
  height: 3px;
  background: var(--coral);
  transform: rotate(-14deg);
  opacity: 0.85;
}

.page-about .about-hero__shape--c {
  top: 18%;
  right: 6%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(61, 224, 208, 0.14);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(1.5rem, 5vw, 2.75rem);
  font-size: var(--fs-small);
}

.page-about .about-hero__crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--sand);
}

.page-about .about-hero__crumb a {
  color: var(--sand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-hero__crumb a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(1rem, 3vw, 1.5rem);
  font-size: clamp(2rem, 8.4vw, 4rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.025em;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  color: var(--sand);
  font-size: var(--fs-body);
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  list-style: none;
  margin: clamp(1.75rem, 5vw, 2.5rem) 0 0;
  padding: clamp(1rem, 3vw, 1.5rem) 0 0;
  border-top: 1px dashed var(--line-light);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-hero__num {
  font-size: clamp(1.4rem, 5.5vw, 2.1rem);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__label {
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--sand);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 4vw, 2rem);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(2.5rem, 7vw, 4.75rem) 0;
}

.page-about .chapter--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .chapter--sand {
  background: var(--sand);
  color: var(--ink);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .chapter--dark {
  background: var(--navy);
  color: var(--paper);
}

.page-about .chapter--deep {
  background: var(--navy-deep);
  color: var(--paper);
}

.page-about .chapter__head {
  display: grid;
  gap: 0.5rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: clamp(1rem, 3vw, 1.5rem);
  border-bottom: 1px solid currentColor;
  border-bottom-color: rgba(107, 122, 134, 0.32);
}

.page-about .chapter--dark .chapter__head,
.page-about .chapter--deep .chapter__head {
  border-bottom-color: var(--line-light);
}

.page-about .chapter__index {
  font-size: var(--fs-small);
  letter-spacing: 0.2em;
  color: var(--coral);
}

.page-about .chapter--dark .chapter__index,
.page-about .chapter--deep .chapter__index {
  color: var(--cyan);
}

.page-about .chapter__title {
  margin: 0;
  font-size: var(--fs-h2);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.015em;
}

.page-about .chapter__sub {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--stone);
}

.page-about .chapter--dark .chapter__sub,
.page-about .chapter--deep .chapter__sub {
  color: var(--sand);
}

.page-about .chapter__body p {
  margin: 0 0 1rem;
}

.page-about .chapter__more {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-top: 1.25rem;
  font-size: var(--fs-small);
}

.page-about .chapter--dark .chapter__more,
.page-about .chapter--deep .chapter__more {
  color: var(--sand);
}

.page-about .link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  color: var(--coral);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-about .link-arrow:hover {
  color: var(--sea-lift);
}

.page-about .chapter--dark .link-arrow:hover,
.page-about .chapter--deep .link-arrow:hover {
  color: var(--cyan);
}

/* ---------- 栅格 ---------- */
.page-about .cols {
  display: grid;
  gap: clamp(1.25rem, 4vw, 2.25rem);
  align-items: start;
}

/* ---------- 章节索引卡 ---------- */
.page-about .about-index {
  background: var(--paper);
  border: var(--about-line);
  border-radius: var(--about-card-r);
  padding: clamp(1rem, 3vw, 1.35rem);
  box-shadow: var(--shadow-paper);
}

.page-about .about-index__title {
  margin: 0 0 0.85rem;
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  color: var(--stone);
  font-weight: 600;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.5rem;
  border-radius: var(--r-sm);
  color: var(--sea);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--fs-small);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

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

.page-about .about-index__link:hover {
  background: var(--sand);
  color: var(--ink);
}

/* ---------- 维护节奏列表 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .rhythm-list__item {
  display: grid;
  gap: 0.4rem;
  padding: 0.9rem 1rem;
  background: var(--paper);
  border: var(--about-line);
  border-left: 4px solid var(--sea);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  transition: transform var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .rhythm-list__item:hover {
  transform: translateX(3px);
  border-left-color: var(--coral);
}

.page-about .rhythm-list__tag {
  justify-self: start;
}

.page-about .rhythm-list__item p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: var(--about-line);
  border-radius: var(--about-card-r);
  overflow: hidden;
  background: var(--sand);
}

.page-about .chapter--dark .about-figure,
.page-about .chapter--deep .about-figure {
  border: var(--about-line-invert);
  background: var(--navy);
}

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

.page-about .about-figure figcaption {
  padding: 0.7rem 0.95rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--stone);
  background: var(--paper);
  border-top: var(--about-line);
}

.page-about .chapter--dark .about-figure figcaption,
.page-about .chapter--deep .about-figure figcaption {
  background: var(--navy-deep);
  color: var(--sand);
  border-top: var(--about-line-invert);
}

/* ---------- 团队卡 ---------- */
.page-about .team-grid {
  margin: 0;
}

.page-about .team-card {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.5rem);
  background: rgba(247, 244, 236, 0.05);
  border: var(--about-line-invert);
  border-radius: var(--about-card-r);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-5px);
  background: rgba(247, 244, 236, 0.09);
  border-color: var(--cyan);
}

.page-about .team-card__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 0.75rem;
  margin-bottom: 0.75rem;
}

.page-about .team-card__title {
  margin: 0 0 0.6rem;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .team-card__text {
  margin: 0 0 0.9rem;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--sand);
}

.page-about .team-card__meta {
  margin: 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--line-light);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ---------- 覆盖数据 ---------- */
.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.page-about .reach-stat {
  padding: 0.9rem 0.85rem;
  background: var(--sand);
  border: var(--about-line);
  border-radius: var(--r-sm);
}

.page-about .reach-stat__num {
  display: block;
  font-size: clamp(1.35rem, 4.5vw, 1.75rem);
  font-weight: 700;
  color: var(--sea);
  line-height: 1.1;
}

.page-about .reach-stat__unit {
  font-size: 0.85rem;
  margin-left: 2px;
}

.page-about .reach-stat__label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.72rem;
  color: var(--stone);
  line-height: 1.5;
}

.page-about .reach-note {
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--stone);
  border-left: 3px solid var(--cyan);
  padding-left: 0.9rem;
}

/* ---------- 时间线 ---------- */
.page-about .road {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.25rem;
  position: relative;
}

.page-about .road::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--coral) 100%);
  opacity: 0.7;
}

.page-about .road__item {
  position: relative;
  padding: 0 0 1rem 2.35rem;
}

.page-about .road__dot {
  position: absolute;
  left: 4px;
  top: 0.75rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--navy-deep);
  border: 2px solid var(--cyan);
  z-index: 1;
}

.page-about .road__dot--now {
  background: var(--coral);
  border-color: var(--coral);
  box-shadow: 0 0 0 5px rgba(255, 107, 74, 0.18);
}

.page-about .road__panel {
  border: var(--about-line-invert);
  border-radius: var(--r-sm);
  background: rgba(247, 244, 236, 0.04);
  overflow: hidden;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .road__panel:hover {
  background: rgba(247, 244, 236, 0.08);
  border-color: var(--cyan);
}

.page-about .road__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.8rem;
  padding: 0.8rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .road__year {
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .road__name {
  font-weight: 700;
  color: var(--paper);
  font-size: 0.95rem;
}

.page-about .road__body {
  padding: 0 1rem 0.95rem;
}

.page-about .road__body p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--sand);
}

/* ---------- 页尾行动区 ---------- */
.page-about .about-cta {
  background: var(--sea);
  color: var(--paper);
  padding: clamp(2rem, 6vw, 3.5rem) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 0.6rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 48ch;
  color: var(--sand);
  font-size: var(--fs-small);
  line-height: 1.75;
}

.page-about .about-cta__actions {
  display: grid;
  gap: 0.7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .cols--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-cta__actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
  }

  .page-about .about-hero__stat {
    flex-direction: row;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .page-about .about-hero__label {
    font-size: 0.8125rem;
  }
}

@media (min-width: 960px) {
  .page-about .cols--asym {
    grid-template-columns: 1.35fr 1fr;
    gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-about .cols--flip {
    grid-template-columns: 1fr 1.15fr;
  }

  .page-about .about-index {
    position: sticky;
    top: 6rem;
  }

  .page-about .about-hero__inner {
    padding-top: clamp(1rem, 3vw, 2rem);
  }

  .page-about .about-hero__lead {
    font-size: 1.0625rem;
  }

  .page-about .chapter__head {
    grid-template-columns: minmax(0, 1fr);
    max-width: 68ch;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: 1.4fr 1fr;
    gap: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rhythm-list__item,
  .page-about .team-card,
  .page-about .road__panel,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .rhythm-list__item:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>