.page-about {
  --about-rail: 236px;
  --about-gap: clamp(24px, 3.4vw, 56px);
  --about-line-strong: #3c5b51;
}

.page-about .breadcrumb {
  margin: clamp(20px, 3vw, 34px) 0 clamp(20px, 3vw, 40px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(36px, 5vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__visual {
  position: relative;
  max-width: 420px;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  left: -10px;
  top: 18%;
  width: 2px;
  height: 34%;
  background: linear-gradient(180deg, var(--lime), transparent);
}

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

.page-about .about-hero__intro h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(1.95rem, 5vw, 3.3rem);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--fog);
  max-width: 18em;
}

.page-about .about-hero__intro .lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--fog);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 0.66fr) minmax(0, 1fr);
    align-items: end;
  }
  .page-about .about-hero__visual {
    max-width: none;
  }
}

/* ---------- 首屏数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 560px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
  background: var(--stand);
}

.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-stat dd {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 2.8vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stat__unit {
  font-size: 0.78rem;
  color: var(--gray);
}

/* ---------- 正文双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(34px, 5vw, 68px);
}

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }
  .page-about .about-body__aside {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: calc(var(--topbar) + 28px);
    align-self: start;
  }
  .page-about .about-body__main {
    grid-column: 2;
    grid-row: 1;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

@media (min-width: 1024px) {
  .page-about .about-index {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 0 18px;
  }
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-index ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 1024px) {
  .page-about .about-index ol {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 9px;
  border-radius: 2px;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--fog);
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

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

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--gray);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-bottom: clamp(34px, 5vw, 62px);
  scroll-margin-top: calc(var(--topbar) + 24px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line);
  padding-top: clamp(34px, 5vw, 62px);
}

.page-about .about-chapter h2 {
  margin: 12px 0 18px;
  max-width: 20em;
  font-family: var(--font-serif);
  font-size: clamp(1.42rem, 2.9vw, 2.1rem);
  line-height: 1.34;
  color: var(--fog);
}

.page-about .about-chapter p {
  margin: 0 0 1.05em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--fog);
}

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

/* ---------- 引用卡 ---------- */
.page-about .about-quote {
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: clamp(20px, 3vw, 28px);
  border-left: 3px solid var(--lime);
}

.page-about .about-quote__text {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(1.12rem, 2.2vw, 1.5rem);
  line-height: 1.55;
  color: var(--lime-soft);
}

.page-about .about-quote__src {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
}

/* ---------- 方法步骤 ---------- */
.page-about .about-steps {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-steps li {
  position: relative;
  padding: 16px 0 16px 50px;
  border-top: 1px solid var(--line);
  counter-increment: about-step;
}

.page-about .about-steps li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-steps li::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .about-steps h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--fog);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.6vw, 36px) 0 0;
}

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

/* ---------- 专家分组 ---------- */
.page-about .about-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-groups li {
  padding: 16px 18px 18px;
  background: var(--stand);
  border: 1px solid var(--line);
  border-left: 2px solid var(--about-line-strong);
  border-radius: 2px;
  transition: border-left-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-groups li:hover {
  border-left-color: var(--lime);
  background: var(--board);
}

.page-about .about-groups h3 {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-groups p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--gray);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence li:last-child {
  border-bottom: 1px solid var(--line);
}

@media (min-width: 620px) {
  .page-about .about-cadence li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .about-cadence__when {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}

.page-about .about-cadence__what {
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--fog);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--line) 38%, var(--line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 28px 34px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--fog);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--gray);
}

@media (min-width: 760px) {
  .page-about .about-timeline::before {
    left: 73px;
  }
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 74px minmax(0, 1fr);
    column-gap: 40px;
    padding-left: 0;
    padding-bottom: 30px;
  }
  .page-about .about-timeline__item::before {
    left: 68px;
    top: 6px;
  }
  .page-about .about-timeline__year {
    margin: 0;
    text-align: right;
    line-height: 1.6;
  }
}

/* ---------- 合作数据 ---------- */
.page-about .about-collab {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-about .about-collab {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-collab__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background: var(--stand);
}

.page-about .about-collab__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-collab__label {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--line);
  border-left: 3px solid var(--lime);
}

.page-about .about-honor__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-honor__text {
  margin: 0;
  flex: 1 1 220px;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 进入产品 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(22px, 3.2vw, 30px) 0 0;
}

@media (min-width: 780px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px 22px;
  background: var(--board);
  border: 1px solid var(--line);
  border-radius: 2px;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .about-next__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-next__title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-next__arrow {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--lime);
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .about-groups li,
  .page-about .about-index__link {
    transition: none;
  }
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>