.page-about {
  --about-rail-w: 250px;
  --about-gap: clamp(28px, 5vw, 64px);
  --about-measure: 66ch;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.85;
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about [id] {
  scroll-margin-top: calc(var(--head-h) + 24px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.34;
  margin: 0;
  color: var(--ink);
}

.page-about p {
  margin: 0 0 1.05em;
  max-width: var(--about-measure);
}

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

/* 面包屑 */
.page-about .about-crumb-wrap {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .about-crumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--jade);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 0.5em;
  color: var(--rust);
  opacity: 0.5;
}

.page-about .about-crumb a {
  color: var(--bronze);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}

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

/* 首屏 */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(32px, 5vw, 56px);
}

.page-about .about-eyebrow {
  color: var(--bronze);
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
}

.page-about .about-title {
  font-size: clamp(2rem, 6.2vw, 3.6rem);
  max-width: 22ch;
  margin-bottom: clamp(20px, 3.6vw, 34px);
}

.page-about .about-hero__body {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
  padding-left: clamp(0px, 2vw, 28px);
  border-left: 1px solid var(--rule);
}

@media (min-width: 900px) {
  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .about-lede {
  font-size: clamp(1.02rem, 2.1vw, 1.2rem);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__sub {
  font-size: 0.96rem;
  color: var(--jade);
}

/* 数据行 */
.page-about .about-stats {
  list-style: none;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule-strong);
}

.page-about .about-stat {
  padding: clamp(14px, 2.4vw, 20px) clamp(10px, 2vw, 22px) clamp(16px, 2.6vw, 22px) 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-stat__num {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--bronze);
  line-height: 1.1;
}

.page-about .about-stat__unit {
  font-family: var(--serif);
  font-size: 0.88rem;
  color: var(--rust);
  margin-left: 0.28em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.5em;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--jade);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-stat {
    border-bottom: 0;
    border-left: 1px solid var(--rule);
    padding-left: clamp(14px, 2vw, 22px);
  }
  .page-about .about-stat:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

/* 主体双栏 */
.page-about .about-grid {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .about-rail {
  border-top: 1px solid var(--rule-strong);
  padding-top: clamp(14px, 2.4vw, 18px);
  font-size: 0.86rem;
  color: var(--jade);
}

.page-about .about-rail__label {
  font-family: var(--serif);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--rust);
  margin: 0 0 0.9em;
}

.page-about .about-rail__label--second {
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-rail__facts {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-rail__facts > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4em 1em;
  padding: 0.55em 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-rail__facts dt {
  color: var(--jade);
}

.page-about .about-rail__facts dd {
  margin: 0;
  font-family: var(--serif);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__index {
  list-style: none;
  margin: 0;
  padding: 0 0 0 14px;
  border-left: 1px solid var(--rule-strong);
}

.page-about .about-rail__index li {
  position: relative;
  padding: 0.36em 0;
}

.page-about .about-rail__index li::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 1.05em;
  width: 7px;
  height: 1px;
  background: var(--rust);
  opacity: 0.55;
}

.page-about .about-rail__index a {
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__index a:hover,
.page-about .about-rail__index a:focus-visible {
  color: var(--bronze);
  border-bottom-color: var(--bronze);
}

@media (min-width: 940px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    align-items: start;
  }
  .page-about .about-rail {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }
  .page-about .about-col-main {
    grid-column: 1;
    grid-row: 1;
  }
}

/* 章节 */
.page-about .about-section {
  padding-top: clamp(34px, 6vw, 60px);
}

.page-about .about-section + .about-section,
.page-about .about-figure + .about-section {
  border-top: 1px solid var(--rule);
  margin-top: clamp(34px, 6vw, 56px);
}

.page-about .about-sec-num {
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  color: var(--bronze);
  margin: 0 0 0.7em;
}

.page-about .about-h2 {
  font-size: clamp(1.42rem, 3.4vw, 2rem);
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

/* 引用 */
.page-about .about-quote {
  margin: clamp(20px, 3.6vw, 30px) 0;
  padding: clamp(16px, 3vw, 24px) clamp(16px, 3vw, 28px);
  background: var(--gold-light);
  border-left: 3px solid var(--bronze);
}

.page-about .about-quote p {
  font-family: var(--serif);
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
  max-width: 44ch;
}

/* 图片 */
.page-about .about-figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--paper-shadow);
}

.page-about .about-figure figcaption {
  margin-top: 0.75em;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--jade);
  padding-left: 0.9em;
  border-left: 1px solid var(--rust);
}

/* 方法 */
.page-about .about-two {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

@media (min-width: 820px) {
  .page-about .about-two {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
  }
}

.page-about .about-methods {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-method {
  position: relative;
  padding: clamp(14px, 2.4vw, 18px) 0 clamp(14px, 2.4vw, 18px) 52px;
  border-top: 1px solid var(--rule);
  outline: none;
}

.page-about .about-method:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-method__num {
  position: absolute;
  left: 0;
  top: clamp(14px, 2.4vw, 18px);
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 0.92rem;
  color: var(--rust);
  border: 1px solid var(--rule-strong);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-method h3 {
  font-size: 1.04rem;
  margin: 0 0 0.28em;
}

.page-about .about-method p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--jade);
}

.page-about .about-method__note {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  color: var(--bronze);
  font-size: 0.9rem;
  transition: max-height 0.3s var(--ease), opacity 0.24s var(--ease), margin-top 0.24s var(--ease);
}

.page-about .about-method:hover .about-method__note,
.page-about .about-method:focus-within .about-method__note,
.page-about .about-method:focus .about-method__note {
  max-height: 8em;
  opacity: 1;
  margin-top: 0.6em;
}

.page-about .about-method:hover .about-method__num,
.page-about .about-method:focus .about-method__num {
  color: var(--bronze);
  border-color: var(--bronze);
}

@media (hover: none) {
  .page-about .about-method__note {
    max-height: none;
    opacity: 1;
    margin-top: 0.6em;
  }
}

.page-about .about-two .about-figure {
  margin-top: clamp(18px, 3vw, 26px);
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(20px, 3.6vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 clamp(22px, 3.6vw, 30px) 34px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--rule-strong);
}

.page-about .about-stage:last-child::before {
  bottom: auto;
  height: 22px;
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--rust);
  border-radius: 50%;
  background: var(--paper);
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-stage:hover::after,
.page-about .about-stage:target::after {
  background: var(--bronze);
  border-color: var(--bronze);
}

.page-about .about-stage__title {
  font-size: clamp(1.06rem, 2.4vw, 1.24rem);
  margin: 0 0 0.4em;
  color: var(--ink);
}

.page-about .about-stage:hover .about-stage__title,
.page-about .about-stage:target .about-stage__title {
  color: var(--bronze);
}

.page-about .about-stage p {
  font-size: 0.96rem;
  color: var(--jade);
  margin: 0;
}

/* 团队 */
.page-about .about-team {
  list-style: none;
  margin: clamp(20px, 3.4vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
}

.page-about .about-team li {
  display: grid;
  gap: 0.3em 1.4em;
  padding: clamp(13px, 2.2vw, 18px) 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.96rem;
  color: var(--jade);
}

@media (min-width: 640px) {
  .page-about .about-team li {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-about .about-team__role {
  font-family: var(--serif);
  font-size: 1.02rem;
  color: var(--bronze);
  letter-spacing: 0.04em;
}

/* 日常 */
.page-about .about-rhythm {
  margin: clamp(20px, 3.4vw, 28px) 0 0;
  display: grid;
  gap: 0;
}

.page-about .about-rhythm > div {
  padding: clamp(13px, 2.2vw, 18px) 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-rhythm > div:last-child {
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 700px) {
  .page-about .about-rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 44px);
  }
}

.page-about .about-rhythm dt {
  font-family: var(--serif);
  font-size: 0.94rem;
  letter-spacing: 0.12em;
  color: var(--rust);
  margin-bottom: 0.35em;
}

.page-about .about-rhythm dd {
  margin: 0;
  font-size: 0.95rem;
  color: var(--jade);
}

/* 伙伴 */
.page-about .about-partners {
  list-style: none;
  margin: clamp(20px, 3.4vw, 28px) 0 clamp(20px, 3.4vw, 28px);
  padding: 0;
  display: grid;
  gap: clamp(16px, 3vw, 28px);
}

@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partners li {
  border-top: 1px solid var(--rule-strong);
  padding-top: 0.85em;
}

.page-about .about-partners__tag {
  display: inline-block;
  font-family: var(--serif);
  font-size: 0.82rem;
  letter-spacing: 0.2em;
  color: var(--bronze);
  margin-bottom: 0.5em;
}

.page-about .about-partners p {
  font-size: 0.92rem;
  color: var(--jade);
  margin: 0;
}

.page-about .about-link {
  color: var(--bronze);
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--bronze);
}

/* 结尾 */
.page-about .about-closing {
  margin-top: clamp(38px, 6vw, 64px);
  padding-top: clamp(22px, 3.6vw, 34px);
  border-top: 1px solid var(--rule-strong);
}

.page-about .about-closing__title {
  font-size: clamp(1.24rem, 3vw, 1.6rem);
  margin-bottom: 0.6em;
}

.page-about .about-closing p {
  color: var(--jade);
  font-size: 0.96rem;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8em;
  margin-top: clamp(16px, 2.6vw, 22px);
}
<<<END>>>