.page-about {
  --about-pad: clamp(18px, 5vw, 64px);
  --about-line: rgba(110, 127, 120, 0.3);
  --about-line-soft: rgba(110, 127, 120, 0.16);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  padding-bottom: clamp(52px, 8vw, 104px);
}

.page-about .about-wrap {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(22px, 5vw, 56px) var(--about-pad) 0;
}

.page-about .about-crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(26px, 6vw, 60px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--dim-on-dark);
}

.page-about .about-crumbs a {
  color: var(--cyan);
  text-decoration: none;
}

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

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 17ch;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(2.3rem, 9.2vw, 5.6rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: clamp(18px, 3vw, 30px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim-on-dark);
}

.page-about .about-preview {
  list-style: none;
  margin: clamp(26px, 5vw, 48px) 0 0;
  padding: 16px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-preview__item {
  display: flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  color: var(--dim-on-dark);
}

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

.page-about .about-hero__figure {
  margin: clamp(28px, 5vw, 56px) 0 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
}

/* 主体双栏：左侧章节索引，右侧层叠目录 */
.page-about .about-layout {
  max-width: var(--shell);
  margin: clamp(40px, 7vw, 96px) auto 0;
  padding: 0 var(--about-pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 5vw, 44px);
}

.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 14px;
  border-bottom: 1px solid var(--about-line);
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 13px;
  border-radius: var(--r-pill);
  font-size: 12px;
  line-height: 1.4;
  color: var(--dim-on-dark);
  text-decoration: none;
  white-space: nowrap;
  transition: color 140ms ease, background-color 140ms ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--lime);
  background: var(--ink-2);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

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

.page-about .about-sec {
  padding: clamp(32px, 6vw, 64px) 0;
  border-top: 1px solid var(--about-line-soft);
  scroll-margin-top: 96px;
}

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

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(14px, 3vw, 26px);
}

.page-about .about-sec__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--score);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(1.45rem, 4.4vw, 2.45rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lead {
  max-width: 30ch;
  margin: 0 0 clamp(16px, 3vw, 24px);
  font-size: clamp(17px, 2.4vw, 20px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-lead--tight {
  margin-bottom: clamp(12px, 2vw, 18px);
}

.page-about .about-body {
  margin: clamp(16px, 3vw, 24px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dim-on-dark);
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 3vw, 28px);
}

.page-about .about-cols p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dim-on-dark);
}

.page-about .about-note {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 14px 18px;
  background: var(--ink-2);
  border-left: 2px solid var(--amber);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--dim-on-dark);
}

/* 暖白阅读区 */
.page-about .about-sec--paper {
  margin-block: clamp(30px, 6vw, 60px);
  padding: clamp(22px, 5vw, 48px);
  background: var(--paper);
  color: var(--ink);
  border-top: 0;
  border-radius: var(--r-xl);
}

.page-about .about-sec--paper .about-sec__title,
.page-about .about-sec--paper .about-lead {
  color: var(--ink);
}

.page-about .about-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-scene {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 4px 14px;
  padding: clamp(14px, 2.4vw, 20px) 0;
  border-top: 1px solid rgba(11, 31, 26, 0.14);
}

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

.page-about .about-scene__no {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--score);
}

.page-about .about-scene__title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-scene__text {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim-on-light);
}

/* 时间轴：唯一的横向滚动区 */
.page-about .about-timeline {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 0 0 18px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .about-tl {
  flex: 0 0 min(78%, 270px);
  scroll-snap-align: start;
  padding: 18px 18px 20px;
  background: var(--ink-2);
  border-radius: var(--r-lg);
  border-top: 2px solid var(--amber);
  transition: border-color 160ms ease;
}

.page-about .about-tl:hover {
  border-top-color: var(--lime);
}

.page-about .about-tl__year {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--dim-on-dark);
}

.page-about .about-fig {
  margin: clamp(20px, 4vw, 32px) 0 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .about-fig--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-fig__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--line);
}

/* 团队数字 */
.page-about .about-team {
  list-style: none;
  margin: clamp(18px, 4vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-team__item {
  padding: 16px 14px;
  background: var(--ink-2);
  border-radius: var(--r-md);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.5vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--dim-on-dark);
}

/* 合作标签 */
.page-about .about-pills {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-pill);
  font-size: 13px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-pill b {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--lime);
}

.page-about .about-honor {
  margin: clamp(16px, 3vw, 22px) 0 0;
}

.page-about .about-pill--honor {
  border-color: var(--amber);
  background: var(--amber);
  color: var(--ink);
  font-weight: 600;
  border-radius: 4px var(--r-pill) var(--r-pill) var(--r-pill);
}

.page-about .about-pill--honor b {
  color: var(--ink);
}

/* 服务原则 */
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-rule {
  padding: 6px 0 6px 16px;
  border-left: 2px solid var(--about-line);
  transition: border-color 160ms ease, padding-left 160ms ease;
}

.page-about .about-rule:hover,
.page-about .about-rule:focus-within,
.page-about .about-rule:focus-visible {
  border-left-color: var(--lime);
  padding-left: 22px;
  outline: none;
}

.page-about .about-rule__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-rule__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim-on-dark);
  transition: color 160ms ease;
}

.page-about .about-rule:hover .about-rule__text,
.page-about .about-rule:focus-within .about-rule__text {
  color: var(--paper);
}

/* 收束区块 */
.page-about .about-cta {
  max-width: var(--shell);
  margin: clamp(48px, 8vw, 96px) auto 0;
  padding: 0 var(--about-pad);
}

.page-about .about-cta__panel {
  padding: clamp(26px, 5vw, 56px);
  background: var(--lime);
  color: var(--ink);
  border-radius: var(--r-xl);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.55rem, 5vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-cta__text {
  max-width: 44ch;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(11, 31, 26, 0.8);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__links {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 13px;
}

.page-about .about-cta__links a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  text-decoration-thickness: 2px;
}

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

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-tl {
    flex: 0 0 236px;
  }

  .page-about .about-fig {
    max-width: 84%;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(36px, 6vw, 96px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0 0 0 20px;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-index__link {
    white-space: normal;
    padding: 8px 0;
    border-radius: 0;
    font-size: 13px;
    line-height: 1.5;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: transparent;
  }

  .page-about .about-hero__title {
    max-width: 20ch;
  }

  .page-about .about-lead {
    max-width: 34ch;
  }

  .page-about .about-scene {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 4px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl,
  .page-about .about-rule,
  .page-about .about-rule__text,
  .page-about .about-index__link {
    transition: none;
  }
}
<<<END>>>