.page-about {
  --ab-measure: 62ch;
  --ab-hair: rgba(245, 242, 234, 0.12);
  --ab-hair-soft: rgba(139, 148, 156, 0.18);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: clamp(18px, 3vw, 32px) 0 0;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .breadcrumb-list > li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line);
}

.page-about .breadcrumb-link {
  color: var(--steel);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--paper-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 64px) 0 clamp(40px, 7vw, 88px);
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.022em;
  margin: 0.9rem 0 1.4rem;
  max-width: 15em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: var(--ab-measure);
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: clamp(22px, 3vw, 32px) 0 0;
  border-top: 1px solid var(--ab-hair);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-facts > li {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-fact-plus {
  font-size: 0.62em;
  color: var(--cyan);
  margin-left: 0.08em;
}

.page-about .about-fact-cap {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--stone);
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 栏内跳转 ---------- */
.page-about .about-jump {
  position: sticky;
  top: var(--header-offset);
  z-index: 6;
  background: rgba(11, 27, 46, 0.94);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--ab-hair);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .about-jump-list {
  display: flex;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0.55rem 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-jump-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump-list > li {
  flex: none;
}

.page-about .about-jump-link {
  display: inline-block;
  white-space: nowrap;
  padding: 0.36rem 0.82rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--paper-dim);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-jump-link:hover,
.page-about .about-jump-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(31, 227, 201, 0.07);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(46px, 7vw, 96px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-jump + .about-sec {
  border-top: none;
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-sec-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-sec-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.016em;
  margin: 0;
  color: var(--paper);
}

.page-about .about-intro {
  max-width: var(--ab-measure);
  margin: 0 0 clamp(22px, 3vw, 34px);
  font-size: 1rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-prose {
  max-width: var(--ab-measure);
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

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

.page-about .about-prose strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

/* ---------- 四类客户 ---------- */
.page-about .audience-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
}

.page-about .audience-item {
  --accent: var(--steel);
  background: var(--ink-900);
  border-left: 2px solid var(--accent);
  padding: clamp(20px, 3vw, 30px);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-width: 0;
}

.page-about .audience-item:nth-child(1) { --accent: var(--clay); }
.page-about .audience-item:nth-child(2) { --accent: var(--steel); }
.page-about .audience-item:nth-child(3) { --accent: var(--moss); }
.page-about .audience-item:nth-child(4) { --accent: var(--gold); }

.page-about .audience-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .audience-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .audience-body {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--paper-dim);
}

.page-about .audience-link {
  margin-top: 0.25rem;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

@media (min-width: 840px) {
  .page-about .audience-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--ab-hair);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06) brightness(0.92);
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure figcaption {
  padding: 0.7rem 0.95rem;
  border-top: 1px solid var(--ab-hair);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .about-banner {
  margin: 0 0 clamp(30px, 5vw, 54px);
  border: 1px solid var(--ab-hair);
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.08) brightness(0.86);
}

@media (min-width: 900px) {
  .page-about .about-split--media {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
  }
}

/* ---------- 团队构成 ---------- */
.page-about .team-stats {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
}

.page-about .team-stat {
  background: var(--ink-900);
  padding: clamp(16px, 2.4vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
}

.page-about .team-stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-stat-plus {
  font-size: 0.6em;
  margin-left: 0.06em;
}

.page-about .team-stat-cap {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--stone);
}

@media (min-width: 620px) {
  .page-about .team-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  padding: clamp(46px, 7vw, 96px) 0;
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tl-list {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 26px);
  padding-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 14px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-rail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  padding-top: 0.2rem;
}

.page-about .tl-dot {
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--gold);
}

.page-about .tl-year {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  opacity: 0.85;
}

.page-about .tl-body {
  max-width: var(--ab-measure);
  min-width: 0;
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.02rem, 1.8vw, 1.22rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-details {
  margin-top: 0.55rem;
}

.page-about .tl-details > summary {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.1rem 0;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  color: var(--steel);
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

.page-about .tl-details > summary::before {
  content: "+";
  font-size: 0.95rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .tl-details[open] > summary::before {
  content: "−";
}

.page-about .tl-details > summary:hover,
.page-about .tl-details > summary:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .tl-details > p {
  margin: 0.7rem 0 0;
  max-width: var(--ab-measure);
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--paper-dim);
  animation: about-fade-in 200ms var(--ease) both;
}

@keyframes about-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-reach {
  padding: clamp(46px, 7vw, 92px) 0;
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .about-reach .about-sec-index {
  color: var(--clay);
}

.page-about .about-reach .about-sec-title {
  color: var(--ink-900);
}

.page-about .reach-stats {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
}

.page-about .reach-stat {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(11, 27, 46, 0.16);
  min-width: 0;
}

.page-about .reach-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 4.6vw, 3.1rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .reach-plus {
  font-size: 0.6em;
  color: var(--clay);
  margin-left: 0.06em;
}

.page-about .reach-cap {
  font-size: 0.84rem;
  line-height: 1.55;
  color: #4A5768;
}

.page-about .about-prose--reach p {
  color: #3C4A5A;
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
  margin-top: 0.4rem;
}

.page-about .about-inline-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 107, 98, 0.35);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  color: var(--ink-900);
  border-bottom-color: var(--ink-900);
}

@media (min-width: 760px) {
  .page-about .reach-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 对接 ---------- */
.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-contact-lines {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-contact-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.95rem 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-contact-line:first-child {
  border-top-color: var(--line);
}

.page-about .about-contact-line dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-contact-line dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
}

.page-about .about-contact-val {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact-line .copy-btn {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
}

@media (min-width: 640px) {
  .page-about .about-contact-line {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 1.2rem;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-split--contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    align-items: start;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-details > p {
    animation: none;
  }

  .page-about .about-jump-link,
  .page-about .audience-link,
  .page-about .breadcrumb-link,
  .page-about .about-inline-links a {
    transition: none;
  }
}
<<<END>>>