.page-about {
  --about-hair: rgba(215, 226, 234, 0.08);
  padding-bottom: clamp(56px, 9vw, 112px);
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .about-masthead,
.page-about .about-statement,
.page-about .about-principles,
.page-about .about-tree,
.page-about .about-docs,
.page-about .about-team,
.page-about .about-timeline,
.page-about .about-ops,
.page-about .about-next {
  padding-top: clamp(42px, 6vw, 82px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  color: var(--text);
}

.page-about h1 {
  font-size: clamp(2.05rem, 5.4vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  margin: 0.28em 0 0.42em;
  max-width: 15em;
}

.page-about h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 900;
  margin: 0.35em 0 0.6em;
  max-width: 18em;
}

.page-about h3 {
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  line-height: 1.45;
  font-weight: 700;
  margin: 0 0 8px;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-masthead__lede {
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.78;
  color: var(--text);
  max-width: 34em;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: clamp(22px, 3.6vw, 36px) 0 0;
}

.page-about .about-stats__item {
  background: var(--panel);
  padding: 14px 16px 16px;
  min-width: 0;
}

.page-about .about-stats dt {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  font-weight: 500;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-masthead__media {
  margin: 28px 0 0;
}

.page-about .about-masthead__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-masthead__media figcaption,
.page-about .about-tree__figure figcaption,
.page-about .about-docs__media figcaption {
  margin-top: 10px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 起点声明 ---------- */
.page-about .about-statement__body {
  max-width: 100%;
}

.page-about .about-statement p {
  font-size: 1rem;
  line-height: 1.82;
  color: var(--text);
  max-width: 64ch;
}

.page-about .about-pullquote {
  font-family: var(--font-serif);
  font-size: clamp(1.08rem, 2vw, 1.36rem);
  line-height: 1.62;
  color: var(--amber);
  border-left: 2px solid var(--amber);
  padding-left: clamp(14px, 2.2vw, 24px);
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  max-width: 26em;
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles__list {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-principle {
  background: var(--panel);
  padding: clamp(18px, 3vw, 30px);
  transition: background-color 0.2s var(--ease);
}

.page-about .about-principle:hover {
  background: var(--raise);
}

.page-about .about-principle__num {
  display: block;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-principle h3 {
  margin: 14px 0 10px;
  font-size: 1.16rem;
  font-weight: 800;
}

.page-about .about-principle p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 栏目架构 ---------- */
.page-about .about-tree__lede {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-tree__figure {
  margin: 24px 0 0;
}

.page-about .about-tree__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-tree__panel {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(18px, 3.4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(158deg, rgba(242, 184, 75, 0.07), rgba(242, 184, 75, 0) 46%),
    var(--panel);
}

.page-about .about-tree__scroll {
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tree__svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .about-tree__nodes {
  display: grid;
  gap: 1px;
  margin-top: clamp(18px, 3vw, 28px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-node {
  background: var(--ink);
}

.page-about .about-node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node summary:hover {
  background: var(--raise);
  color: var(--amber);
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-about .about-node summary .mono {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--amber);
  flex: 0 0 auto;
}

.page-about .about-node p {
  margin: 0;
  padding: 0 16px 15px;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-node[open] summary {
  background: var(--raise);
  color: var(--amber);
}

.page-about .about-tree__note {
  margin: 18px 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 文档维护 ---------- */
.page-about .about-docs__media {
  margin: 0 0 26px;
}

.page-about .about-docs__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-docs__text p {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text);
  max-width: 40em;
}

.page-about .about-docs__list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-docs__list li {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-docs__list strong {
  display: block;
  color: var(--text);
  font-weight: 700;
  margin-bottom: 5px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__lede {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 42em;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-role {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.8vw, 26px);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--amber);
  background: var(--raise);
}

.page-about .about-role__num {
  display: block;
  font-size: clamp(2rem, 3.8vw, 2.9rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-role__unit {
  display: block;
  margin-top: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-role h3 {
  margin: 16px 0 8px;
  font-size: 1.04rem;
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline__intro p {
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 26em;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 8px;
  outline: none;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line);
  border: 1px solid var(--line);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, 0.18);
}

.page-about .about-timeline__item:focus-visible {
  box-shadow: 0 0 0 2px var(--signal);
  border-radius: 2px;
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.76;
  color: var(--muted);
  max-width: 42em;
}

.page-about .about-timeline__hover {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--amber);
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__hover,
.page-about .about-timeline__item:focus-visible .about-timeline__hover,
.page-about .about-timeline__item:focus-within .about-timeline__hover {
  opacity: 1;
  transform: none;
}

/* ---------- 运营信息 ---------- */
.page-about .about-ops__panel {
  padding: clamp(20px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(255, 107, 53, 0.12), rgba(255, 107, 53, 0) 58%),
    var(--panel);
}

.page-about .about-ops__text {
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--text);
  max-width: 40em;
}

.page-about .about-ops__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 6px 0 0;
}

.page-about .about-ops__links a {
  font-size: 0.92rem;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 184, 75, 0.4);
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease);
}

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

.page-about .about-ops__links a:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .about-ops__list {
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-ops__list > div {
  border-top: 1px solid var(--line);
  padding-top: 11px;
}

.page-about .about-ops__list dt {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 5px;
}

.page-about .about-ops__list dd {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-about .about-ops__list dd.mono {
  letter-spacing: 0.02em;
  color: var(--amber);
}

/* ---------- 入口指引 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
  margin-top: clamp(42px, 6vw, 82px);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-next__actions .btn {
  flex: 0 0 auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-tree__nodes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (min-width: 860px) {
  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-node p {
    min-height: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-masthead__media {
    margin-top: 8px;
  }

  .page-about .about-tree__figure {
    margin-top: 6px;
  }

  .page-about .about-docs__media {
    margin-bottom: 0;
  }

  .page-about .about-docs__text {
    margin-top: 34px;
  }

  .page-about .about-timeline__list {
    margin-top: 8px;
  }

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

@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-role:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-role:nth-child(3) {
    margin-top: 12px;
  }

  .page-about .about-role:nth-child(4) {
    margin-top: 44px;
  }
}

@media (hover: none) {
  .page-about .about-timeline__hover {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-role,
  .page-about .about-node summary,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__hover,
  .page-about .about-ops__links a {
    transition: none;
  }
}
<<<END>>>