.page-about {
  background:
    radial-gradient(1100px 520px at 12% -6%, rgba(184, 255, 61, 0.13), transparent 62%),
    radial-gradient(900px 460px at 100% 6%, rgba(255, 122, 26, 0.12), transparent 60%),
    var(--space);
  color: var(--cream);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about :focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 3px;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs__item {
  color: var(--sage);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--night-lift);
}

.page-about .breadcrumbs__link {
  color: var(--ice);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--lime);
}

/* 首屏 */
.page-about .about-masthead {
  padding-top: clamp(20px, 4vw, 48px);
}

.page-about .about-masthead__grid {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
  margin-top: clamp(20px, 3.5vw, 40px);
}

.page-about .about-masthead__lead .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-masthead h1 {
  margin: 14px 0 0;
  font-size: clamp(2.1rem, 6.6vw, 4.2rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--cream);
}

.page-about .about-masthead__lede {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(255, 249, 238, 0.82);
}

.page-about .about-masthead__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 16px;
  border: 2px solid var(--night-lift);
  border-radius: 14px;
  background: rgba(16, 42, 76, 0.78);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stat--lime .about-stat__num {
  color: var(--lime);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(255, 249, 238, 0.86);
}

.page-about .about-hero {
  margin: clamp(26px, 5vw, 52px) 0 0;
}

.page-about .about-hero .figure__img {
  display: block;
  width: 100%;
  height: auto;
  border: 3px solid rgba(255, 249, 238, 0.2);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-hard);
  object-fit: cover;
}

.page-about .about-hero .figure__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--sage);
}

/* 奶油纸内容舱 */
.page-about .about-shell {
  margin-top: clamp(30px, 6vw, 70px);
  padding: clamp(20px, 4vw, 52px);
  background: var(--paper);
  color: var(--ink);
  border: 3px solid var(--ink);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
}

.page-about .about-shell__grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

/* 章节索引 */
.page-about .about-index {
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--paper-soft);
  padding: 12px 14px;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-ink);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 2px solid var(--ink);
  border-radius: var(--r-pill);
  color: var(--ink);
  font-size: 12.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index__link:hover {
  background: var(--lime);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

/* 章节正文 */
.page-about .about-chapter {
  padding-top: clamp(22px, 3.5vw, 36px);
  margin-top: clamp(24px, 3.5vw, 40px);
  border-top: 2px solid rgba(26, 20, 16, 0.18);
}

.page-about .about-chapter:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(12px, 2vw, 20px);
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-chapter .prose {
  color: var(--ink);
  font-size: clamp(15px, 1.1vw, 16.5px);
  line-height: 1.85;
  max-width: 64ch;
}

.page-about .about-chapter .prose p {
  margin: 0 0 1em;
}

.page-about .about-chapter .prose a {
  color: var(--ink);
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-chapter .prose a:hover {
  background: var(--lime);
}

.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-figure .figure__img {
  display: block;
  width: 100%;
  height: auto;
  border: 3px solid var(--ink);
  border-radius: 14px;
  box-shadow: var(--shadow-hard);
  object-fit: cover;
}

.page-about .about-figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted-ink);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0 0 0 20px;
  border-left: 3px solid rgba(26, 20, 16, 0.22);
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 14px 16px;
  background: var(--paper-soft);
  border: 2px solid var(--ink);
  border-radius: 14px;
  box-shadow: 4px 4px 0 rgba(26, 20, 16, 0.16);
  transition: box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--lime);
  border: 2px solid var(--ink);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  box-shadow: 6px 6px 0 var(--lime);
  transform: translateY(-2px);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 4px 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted-ink);
}

/* 团队三层 */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-team__cell {
  padding: 16px 18px;
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--paper-soft);
  box-shadow: 4px 4px 0 rgba(26, 20, 16, 0.16);
}

.page-about .about-team__cell--shift {
  background: var(--night);
  color: var(--cream);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-team__cell--shift .about-team__num {
  color: var(--lime);
}

.page-about .about-team__title {
  margin: 8px 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: inherit;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted-ink);
}

.page-about .about-team__cell--shift .about-team__text {
  color: rgba(255, 249, 238, 0.78);
}

/* 服务范围数据条 */
.page-about .about-scope {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-scope__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border-left: 5px solid var(--lime);
  background: var(--paper-soft);
  border-radius: 0 12px 12px 0;
}

.page-about .about-scope__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-scope__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted-ink);
}

.page-about .about-linkline {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted-ink);
}

.page-about .about-linkline a {
  color: var(--ink);
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-linkline a:hover {
  background: var(--lime);
}

/* 原则 */
.page-about .about-principles {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-principles li {
  padding: 4px 0 4px 15px;
  border-left: 4px solid var(--lime);
}

.page-about .about-principles h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-principles p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted-ink);
}

/* 底部引导 */
.page-about .about-cta {
  margin-top: clamp(30px, 6vw, 64px);
  padding: clamp(22px, 4vw, 46px);
  background:
    radial-gradient(600px 240px at 82% 0%, rgba(184, 255, 61, 0.16), transparent 65%),
    var(--night);
  border: 3px solid var(--lime);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 300;
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 249, 238, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta__ghost {
  color: var(--cream);
  border-color: rgba(255, 249, 238, 0.45);
}

.page-about .about-cta__note {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--sage);
}

.page-about .about-cta__note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid rgba(184, 255, 61, 0.5);
}

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

/* 平板与桌面 */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-masthead__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-masthead__stats {
    align-self: end;
  }

  .page-about .about-shell {
    padding: clamp(32px, 4vw, 56px);
  }
}

@media (min-width: 980px) {
  .page-about .about-shell__grid {
    grid-template-columns: minmax(0, 1fr) 208px;
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-chapters {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .page-about .about-index {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    position: sticky;
    top: 96px;
    padding: 14px 12px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    padding: 8px 0 8px 10px;
    white-space: normal;
    font-size: 13px;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--lime);
    background: rgba(184, 255, 61, 0.3);
  }
}

@media (min-width: 1180px) {
  .page-about .about-shell__grid {
    grid-template-columns: minmax(0, 1fr) 236px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 40px);
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-timeline__item {
    border-left: 3px solid rgba(26, 20, 16, 0.22);
    border-radius: 0 14px 14px 0;
  }

  .page-about .about-timeline__item::before {
    left: -8px;
    top: 22px;
  }

  .page-about .about-figure--wide {
    margin-top: clamp(24px, 3vw, 36px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-within {
    transform: none;
  }
}
<<<END>>>