.page-about {
  background-color: var(--paper);
  color: var(--graphite);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero {
  max-width: 900px;
}

.page-about .about-hero .eyebrow {
  color: var(--blue);
  margin: 0;
}

.page-about .about-hero .display {
  margin: 0.75rem 0 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 250;
  font-size: clamp(2.1rem, 6.2vw, 4.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  margin: 1.25rem 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  background-color: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-facts > div {
  background-color: var(--paper);
  padding: 0.95rem 1.1rem 1.15rem;
}

.page-about .about-facts dt {
  margin: 0 0 0.45rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--graphite);
  opacity: 0.72;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--ink);
}

/* ---------- 通栏首图 ---------- */
.page-about .about-lead {
  margin: clamp(2rem, 5vw, 3.25rem) 0 clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-lead .media__frame {
  border-radius: var(--r-xl);
  overflow: hidden;
}

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

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 212px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }
}

/* 左侧小节索引 */
.page-about .about-index {
  border-top: 2px solid var(--ink);
  padding-top: 0.9rem;
}

@media (min-width: 1000px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
  }
}

.page-about .about-index__head {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--graphite);
  opacity: 0.7;
}

.page-about .about-index .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
}

@media (max-width: 999px) {
  .page-about .about-index .index-list {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

.page-about .index-list__item {
  min-width: 0;
}

.page-about .index-list__link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.5rem 0.2rem 0.5rem 0;
  color: var(--graphite);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.5;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .index-list__link:hover,
.page-about .index-list__link:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--steel);
}

.page-about .index-list__link.is-active {
  color: var(--blue);
  font-weight: 700;
  border-bottom-color: var(--blue);
}

.page-about .index-list__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--brass);
}

.page-about .index-list__label {
  min-width: 0;
}

/* ---------- 正文列 ---------- */
.page-about .about-body {
  max-width: 820px;
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: calc(var(--header-h) + 1.25rem);
  padding-top: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--rule);
}

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

.page-about .about-sec__head {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: clamp(1rem, 2.5vw, 1.6rem);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-sec h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-sec p {
  margin: 0 0 1rem;
  max-width: 68ch;
  line-height: 1.85;
}

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

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 clamp(1.75rem, 4vw, 2.5rem);
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 14px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--steel) 0%, var(--blue) 62%, var(--orange) 100%);
  opacity: 0.85;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 1.1rem;
  padding-bottom: clamp(1.4rem, 3.5vw, 2rem);
}

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

.page-about .about-timeline__dot {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background-color: var(--blue);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.page-about .about-timeline__item--now .about-timeline__dot {
  background-color: var(--orange);
}

.page-about .about-timeline__body {
  min-width: 0;
  padding-top: 0.35rem;
}

.page-about .about-sec .about-timeline__meta {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--graphite);
  opacity: 0.72;
  line-height: 1.5;
}

.page-about .about-sec .about-timeline__title {
  margin: 0 0 0.5rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.35;
}

.page-about .about-sec .about-timeline__body p {
  margin: 0;
  max-width: 60ch;
}

.page-about .about-version-figure {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2rem);
}

.page-about .about-version-figure .media__frame {
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

/* ---------- 六段节点 ---------- */
.page-about .about-nodes {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

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

.page-about .about-nodes__item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
  padding: 0.7rem 0.85rem;
  background-color: var(--cream);
  border: 1px solid var(--rule);
  border-radius: var(--r-pill);
}

.page-about .about-nodes__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .about-nodes__name {
  font-size: 0.9rem;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- 编号示意 ---------- */
.page-about .about-code {
  margin: clamp(1.5rem, 3.5vw, 2rem) 0;
  padding: clamp(1.15rem, 3vw, 1.75rem);
  background-color: var(--cream);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
}

.page-about .about-code__label {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--graphite);
  opacity: 0.75;
}

.page-about .about-code__full {
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.5vw, 2.25rem);
  letter-spacing: 0.02em;
  color: var(--ink);
  cursor: pointer;
  display: inline-block;
  border-bottom: 2px solid var(--brass);
  padding-bottom: 0.15rem;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-code__full:hover {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.page-about .about-code__full.is-copied {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .about-code__parts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

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

.page-about .about-code__part {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  min-width: 0;
}

.page-about .about-code__seg {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--blue);
  background-color: var(--paper);
  border: 1px solid var(--steel);
  border-radius: 8px;
  padding: 0.1rem 0.45rem;
}

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

.page-about .about-code__note {
  margin: 1.1rem 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--graphite);
  padding-left: 0.9rem;
  border-left: 2px solid var(--brass);
}

/* ---------- 校验节奏 ---------- */
.page-about .about-cadence {
  margin: clamp(1.5rem, 3.5vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-cadence > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 720px) {
  .page-about .about-cadence > div {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }
}

.page-about .about-cadence dt {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--blue);
}

.page-about .about-cadence dd {
  margin: 0;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- 团队表格 ---------- */
.page-about .about-table-wrap {
  margin: clamp(1.4rem, 3.5vw, 2rem) 0;
}

.page-about .about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .about-table__caption {
  caption-side: top;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--graphite);
  opacity: 0.72;
  padding-bottom: 0.7rem;
}

.page-about .about-table th,
.page-about .about-table td {
  text-align: left;
  padding: 0.85rem 0.9rem;
  vertical-align: top;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-table thead th {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--ink);
  background-color: var(--paper);
  border-bottom: 2px solid var(--ink);
  white-space: nowrap;
}

.page-about .about-table tbody th {
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-table tbody tr:nth-child(even) {
  background-color: rgba(216, 211, 199, 0.42);
}

.page-about .about-table tbody tr:hover {
  background-color: rgba(168, 196, 220, 0.28);
}

@media (max-width: 719px) {
  .page-about .about-table,
  .page-about .about-table tbody,
  .page-about .about-table tr,
  .page-about .about-table th,
  .page-about .about-table td {
    display: block;
    width: 100%;
  }

  .page-about .about-table thead {
    display: none;
  }

  .page-about .about-table tbody tr {
    border: 1px solid var(--rule);
    border-radius: var(--r-md);
    padding: 0.85rem 0.95rem;
    margin-bottom: 0.75rem;
    background-color: var(--paper);
  }

  .page-about .about-table tbody tr:nth-child(even) {
    background-color: var(--paper);
  }

  .page-about .about-table tbody th {
    font-size: 1rem;
    padding: 0 0 0.5rem;
    border-bottom: 1px solid var(--rule);
    margin-bottom: 0.55rem;
    white-space: normal;
  }

  .page-about .about-table td {
    border-bottom: 0;
    padding: 0.3rem 0;
  }

  .page-about .about-table td::before {
    content: attr(data-label);
    display: block;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    color: var(--brass);
    margin-bottom: 0.2rem;
  }
}

/* ---------- 归档范围 ---------- */
.page-about .about-scope {
  list-style: none;
  margin: clamp(1.4rem, 3.5vw, 2rem) 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-scope__item {
  background-color: var(--paper);
  padding: 1rem 1.05rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .about-scope__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  line-height: 1.15;
  color: var(--blue);
}

.page-about .about-scope__label {
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about .about-map {
  margin: clamp(1.4rem, 3.5vw, 2rem) 0;
}

.page-about .about-map .media__frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--rule);
}

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

/* ---------- 备案与引用 ---------- */
.page-about .about-legal {
  margin: clamp(1.4rem, 3.5vw, 2rem) 0;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background-color: var(--ink);
  border-radius: var(--r-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
}

.page-about .about-legal__icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  letter-spacing: 0.04em;
  color: var(--paper);
  cursor: pointer;
  transition: color 0.16s var(--ease);
}

.page-about .about-legal__icp:hover {
  color: var(--orange);
}

.page-about .about-legal__icp.is-copied {
  color: var(--green);
}

.page-about .about-legal__role {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-rules {
  list-style: none;
  margin: clamp(1.4rem, 3.5vw, 2rem) 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-rules li {
  padding-left: 0.95rem;
  border-left: 2px solid var(--steel);
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-rules__k {
  display: inline-block;
  margin-right: 0.55rem;
  padding: 0.1rem 0.55rem;
  border-radius: var(--r-pill);
  background-color: var(--cream);
  border: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  vertical-align: 1px;
}

.page-about .about-legal__tail {
  margin: clamp(1.4rem, 3.5vw, 2rem) 0 0;
  line-height: 1.9;
}

.page-about .about-legal__tail a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--steel);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

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

/* ---------- 旁注窄栏 ---------- */
.page-about .note {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
}

.page-about .note__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--brass);
}

.page-about .note__body {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--graphite);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-list__link,
  .page-about .about-code__full,
  .page-about .about-legal__icp,
  .page-about .about-legal__tail a {
    transition: none;
  }
}
<<<END>>>