.page-about {
  --about-side: 3.25rem;
  --about-rule: 1px solid var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.25rem, 3.5vw, 2.25rem) clamp(2rem, 5vw, 3.5rem);
  border-bottom: var(--about-rule);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: 1.5rem;
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.95rem, 6vw, 3.4rem);
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 1rem 0 0;
  max-width: 34rem;
  font-size: clamp(0.95rem, 1.4vw, 1.02rem);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-facts {
  display: grid;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: var(--about-rule);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.85rem 1rem;
  background: var(--panel);
}

.page-about .fact__num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .fact__label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero__media {
  margin: 0;
}

/* ---------- 通用小节头 ---------- */
.page-about .sec-head {
  display: grid;
  gap: 0.7rem;
  max-width: 48rem;
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.2vw, 2.3rem);
  line-height: 1.16;
  color: var(--text);
}

.page-about .sec-head p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .tl-track {
  width: 100%;
  max-width: 26rem;
  height: 1.5rem;
  margin-top: 0.5rem;
  color: var(--line);
}

.page-about .tl-track circle {
  fill: var(--track);
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .tl-track circle:last-of-type {
  fill: var(--orange);
  stroke: var(--orange);
}

.page-about .tl-track circle:first-of-type {
  fill: var(--green);
  stroke: var(--green);
}

.page-about .about-timeline__media {
  margin: 1.75rem 0 0;
}

.page-about .tl {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-about .tl__item {
  display: grid;
  gap: 0.7rem;
  padding: 1.4rem 0;
  border-top: var(--about-rule);
}

.page-about .tl__item:last-child {
  border-bottom: var(--about-rule);
}

.page-about .tl__tag {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  color: var(--orange);
}

.page-about .tl__label {
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.page-about .tl__text {
  margin: 0.5rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tl__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__tags li {
  padding: 0.22rem 0.55rem;
  border: var(--about-rule);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--mint);
  background: rgba(167, 243, 208, 0.06);
}

/* ---------- 团队（暖纸色区） ---------- */
.page-about .about-team {
  margin-block: clamp(1rem, 3vw, 2rem);
  padding-block: clamp(2.25rem, 5.5vw, 4rem);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-team .sec-head h2 {
  color: var(--ink);
}

.page-about .about-team .sec-head p {
  color: rgba(11, 20, 32, 0.72);
}

.page-about .about-team .eyebrow {
  color: var(--orange-deep);
}

.page-about .team-grid {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.75rem;
}

.page-about .team-card {
  display: grid;
  gap: 0.3rem;
  padding: 1.1rem 1.15rem;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(11, 20, 32, 0.14);
  border-radius: var(--r-md);
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .team-card__num small {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  color: rgba(11, 20, 32, 0.55);
  margin-left: 0.1rem;
}

.page-about .team-card__label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-card__note {
  font-size: 0.78rem;
  line-height: 1.65;
  color: rgba(11, 20, 32, 0.66);
}

.page-about .cadence {
  display: grid;
  gap: 0.7rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence__item {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}

.page-about .cadence__bar {
  flex: none;
  width: 3px;
  align-self: stretch;
  min-height: 1.6rem;
  border-radius: 2px;
  background: var(--orange-deep);
}

.page-about .cadence__text {
  font-size: 0.84rem;
  line-height: 1.7;
  color: rgba(11, 20, 32, 0.78);
}

.page-about .cadence__text strong {
  font-weight: 600;
  color: var(--ink);
  margin-right: 0.35rem;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .reach-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .reach-copy h2 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.15rem);
  line-height: 1.18;
  color: var(--text);
}

.page-about .reach-copy p {
  margin: 0.9rem 0 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .reach-cta {
  margin-top: 1.25rem;
}

.page-about .reach-stats {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-rule);
  border-radius: var(--r-md);
  overflow: hidden;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .reach-stat {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 0.9rem;
  background: var(--panel);
}

.page-about .reach-stat__num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .reach-stat__num small {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  margin-left: 0.15rem;
}

.page-about .reach-stat__label {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .partners {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partners__item {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.4rem 0.8rem;
  border: var(--about-rule);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--muted);
  background: rgba(19, 31, 46, 0.7);
}

.page-about .partners__item strong {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--green);
}

/* ---------- 资质与荣誉 ---------- */
.page-about .about-honors {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
  border-top: var(--about-rule);
}

.page-about .honor-grid {
  display: grid;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: var(--about-rule);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .honor {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: 1.05rem 1.1rem;
  background: var(--panel);
  transition: background 0.2s var(--ease);
}

.page-about .honor:hover {
  background: var(--track);
}

.page-about .honor__kind {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .honor__title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .honor__meta {
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .honor-visual {
  margin: 1.5rem 0 0;
  border: var(--about-rule);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--track);
}

.page-about .honor-visual img {
  display: block;
  width: 100%;
  height: clamp(8.5rem, 22vw, 13rem);
  object-fit: cover;
}

/* ---------- 服务路径技能树 ---------- */
.page-about .about-path {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .path-tree {
  display: grid;
  gap: 1.1rem;
  margin: 1.75rem 0 0;
  padding: 0 0 0 1.4rem;
  list-style: none;
  border-left: var(--about-rule);
}

.page-about .path-node {
  position: relative;
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.1rem;
  background: var(--panel);
  border: var(--about-rule);
  border-radius: var(--r-md);
  box-shadow: var(--shadow);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .path-node::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 1.4rem;
  width: 1.4rem;
  height: 1px;
  background: var(--line);
}

.page-about .path-node:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 106, 42, 0.55);
}

.page-about .path-node__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .path-node h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
}

.page-about .path-node p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(2.25rem, 5vw, 3.75rem) clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-next__inner {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.25rem, 3.5vw, 2.25rem);
  border: var(--about-rule);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(19, 31, 46, 0.95), rgba(11, 20, 32, 0.98));
}

.page-about .about-next__copy h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.6vw, 1.95rem);
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-next__copy p {
  margin: 0.8rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.page-about .about-next__link {
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

.page-about .about-next a:focus-visible,
.page-about .about-reach a:focus-visible,
.page-about .breadcrumb a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 34rem) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 40rem) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 48rem) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: center;
  }
}

@media (min-width: 56rem) {
  .page-about .tl__item {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    gap: 2rem;
    padding: 2rem 0;
  }

  .page-about .tl__tag {
    flex-direction: column;
    align-items: center;
    gap: 0.7rem;
    align-self: start;
    padding-top: 0.15rem;
  }

  .page-about .tl__year {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 1rem;
    letter-spacing: 0.12em;
  }

  .page-about .tl__label {
    writing-mode: vertical-rl;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
  }

  .page-about .path-tree {
    padding-left: 2.25rem;
  }

  .page-about .path-node::before {
    left: -2.25rem;
    width: 2.25rem;
  }
}

@media (min-width: 62rem) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: end;
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

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

@media (min-width: 64rem) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .honor,
  .page-about .path-node,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .path-node:hover {
    transform: none;
  }
}
<<<END>>>