.page-about {
  --about-cut: clamp(16px, 3.4vw, 34px);
  --about-hair: rgba(143, 166, 178, .18);
  --about-hair-strong: rgba(143, 166, 178, .34);
  --about-ink: #0B1E2D;
  --about-gap: clamp(34px, 6vw, 84px);
  padding: clamp(12px, 3vw, 32px) 0 clamp(44px, 8vw, 92px);
}

.page-about .breadcrumb { margin-bottom: clamp(18px, 3vw, 32px); }

/* 首屏 */
.page-about .about-hero { position: relative; }
.page-about .about-hero .eyebrow { color: var(--cyan); }
.page-about .about-h1 {
  margin: .3em 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 7.2vw, 80px);
  line-height: 1.05;
  letter-spacing: -.025em;
  color: var(--chalk);
  max-width: 18em;
}
.page-about .about-h1 em {
  font-style: normal;
  color: var(--yellow);
  background: linear-gradient(180deg, transparent 64%, rgba(245, 213, 71, .22) 64%);
}
.page-about .about-lede {
  margin: clamp(16px, 3vw, 26px) 0 0;
  max-width: 62ch;
  color: rgba(244, 247, 243, .8);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
}
.page-about .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

/* 坐标板 */
.page-about .coord-board {
  position: relative;
  margin-top: clamp(26px, 5vw, 48px);
  padding: clamp(16px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(255, 107, 53, .16), transparent 58%),
    linear-gradient(180deg, rgba(0, 229, 195, .09), rgba(11, 30, 45, 0) 46%),
    var(--panel-soft);
  overflow: hidden;
}
.page-about .coord-axis { display: block; width: 100%; height: auto; }
.page-about .coord-stats {
  list-style: none;
  margin: clamp(14px, 2.5vw, 22px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.page-about .coord-stats li {
  border-top: 1px solid var(--about-hair);
  padding-top: 10px;
  display: grid;
  gap: 2px;
}
.page-about .coord-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cyan);
}
.page-about .coord-stats li:nth-child(2) .coord-num { color: var(--yellow); }
.page-about .coord-stats li:nth-child(3) .coord-num { color: var(--chalk); }
.page-about .coord-stats li:nth-child(4) .coord-num { color: var(--orange); }
.page-about .coord-label { font-size: 13px; line-height: 1.55; color: var(--steel); }

/* 章节骨架 */
.page-about .about-section { padding: var(--about-gap) 0 0; }
.page-about .ab-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 4vw, 38px);
}
.page-about .ab-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--yellow);
}
.page-about .ab-h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--chalk);
  max-width: 20em;
}
.page-about .ab-note {
  margin: 0;
  max-width: 56ch;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.75;
}

/* 01 起点 */
.page-about .origin-grid { display: grid; gap: clamp(20px, 4vw, 40px); }
.page-about .origin-text p {
  margin: 0 0 1em;
  color: rgba(244, 247, 243, .8);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
}
.page-about .origin-text p:first-child { color: var(--chalk); }
.page-about .origin-text .btn { margin-top: 6px; }
.page-about .origin-figure { margin: 0; }
.page-about .origin-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - var(--about-cut)));
}
.page-about .origin-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* 02 坐标方法 */
.page-about .method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}
.page-about .method-item {
  padding: clamp(16px, 2.6vw, 26px);
  background: linear-gradient(120deg, rgba(16, 42, 58, .94), rgba(11, 30, 45, .5));
  border: 1px solid var(--about-hair);
  border-left: 3px solid rgba(0, 229, 195, .5);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.page-about .method-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}
.page-about .method-title {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  letter-spacing: -.01em;
  color: var(--chalk);
}
.page-about .method-item p {
  margin: 0;
  color: rgba(244, 247, 243, .74);
  font-size: 14.5px;
  line-height: 1.78;
}

/* 03 服务原则 */
.page-about .principle-grid { display: grid; gap: clamp(12px, 2vw, 18px); }
.page-about .principle-card {
  padding: clamp(16px, 2.6vw, 24px);
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
  border-top: 2px solid rgba(0, 229, 195, .55);
}
.page-about .principle-card:nth-child(2) { border-top-color: rgba(245, 213, 71, .6); }
.page-about .principle-card:nth-child(3) { border-top-color: rgba(255, 107, 53, .62); }
.page-about .principle-card:nth-child(4) { border-top-color: rgba(31, 122, 92, .95); }
.page-about .principle-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 20px);
  letter-spacing: -.01em;
  color: var(--chalk);
}
.page-about .principle-card p {
  margin: 0;
  color: rgba(244, 247, 243, .74);
  font-size: 14.5px;
  line-height: 1.78;
}

/* 04 团队 */
.page-about .team-grid { display: grid; gap: clamp(18px, 3vw, 28px); }
.page-about .team-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}
.page-about .team-text p {
  margin: 0 0 1em;
  color: rgba(244, 247, 243, .8);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
}
.page-about .team-stats {
  list-style: none;
  margin: clamp(16px, 3vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .team-stats li {
  border-left: 1px solid var(--about-hair-strong);
  padding-left: 12px;
  display: grid;
  gap: 2px;
}
.page-about .team-stats .mono {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.4vw, 23px);
  line-height: 1.15;
  color: var(--yellow);
}
.page-about .team-stats li span:last-child { font-size: 12.5px; color: var(--steel); line-height: 1.5; }
.page-about .team-note {
  background: var(--mist);
  color: var(--about-ink);
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-sm);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 20px));
}
.page-about .team-note p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
}
.page-about .team-note p:last-child { margin-bottom: 0; }
.page-about .team-note .team-note-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: #1F7A5C;
}

/* 05 里程碑时间轴 */
.page-about .milestone-wrap { display: grid; gap: clamp(26px, 4vw, 44px); }
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange) 74%, rgba(255, 107, 53, 0));
}
.page-about .tl-item { position: relative; }
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
}
.page-about .tl-year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--yellow);
}
.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: -.01em;
  color: var(--chalk);
}
.page-about .tl-card > p {
  margin: 0;
  color: rgba(244, 247, 243, .78);
  font-size: 14.5px;
  line-height: 1.78;
}
.page-about .tl-card details {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--about-hair-strong);
}
.page-about .tl-card summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .tl-card summary::-webkit-details-marker { display: none; }
.page-about .tl-card summary::after { content: "+"; margin-left: 8px; }
.page-about .tl-card details[open] summary::after { content: "−"; }
.page-about .tl-card summary:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }
.page-about .tl-card details p {
  margin: 10px 0 0;
  color: var(--steel);
  font-size: 13.5px;
  line-height: 1.8;
}
.page-about .milestone-figure { margin: 0; }
.page-about .milestone-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}
.page-about .milestone-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--steel);
}

/* 06 合作与资质 */
.page-about .cert-panel {
  padding: clamp(22px, 4vw, 46px) clamp(18px, 3.5vw, 44px) clamp(34px, 5vw, 60px);
  background: var(--mist);
  color: var(--about-ink);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), 0 100%);
}
.page-about .ab-idx--dark { color: #1F7A5C; }
.page-about .ab-h2--dark { color: var(--about-ink); margin-top: 8px; max-width: 22em; }
.page-about .cert-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(16px, 3vw, 26px);
}
.page-about .cert-text p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(11, 30, 45, .82);
}
.page-about .cert-text p:last-child { margin-bottom: 0; }
.page-about .cert-facts {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.page-about .cert-fact {
  display: grid;
  gap: 2px;
  padding: 12px 14px;
  background: rgba(11, 30, 45, .06);
  border-left: 3px solid #1F7A5C;
  border-radius: 0 8px 8px 0;
}
.page-about .cert-fact .mono {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.2;
  color: var(--about-ink);
}
.page-about .cert-fact span:last-child { font-size: 12.5px; line-height: 1.5; color: rgba(11, 30, 45, .62); }
.page-about .cert-fact--wide { grid-column: 1 / -1; }
.page-about .cert-fact--wide .mono { font-size: clamp(13px, 1.8vw, 16px); letter-spacing: .02em; }

/* 07 来到南京 */
.page-about .visit-grid {
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}
.page-about .visit-card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(16px, 2.6vw, 24px);
  background: var(--panel);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-sm);
}
.page-about .visit-card--alert {
  border-color: rgba(255, 107, 53, .45);
  box-shadow: inset 3px 0 0 var(--orange);
}
.page-about .visit-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--steel);
}
.page-about .visit-value {
  margin: 0;
  color: var(--chalk);
  font-weight: 600;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.6;
  word-break: break-word;
}
.page-about .visit-note {
  margin: 0;
  color: rgba(244, 247, 243, .7);
  font-size: 13.5px;
  line-height: 1.72;
}
.page-about .visit-card .copy-chip { justify-self: start; margin-top: 4px; }
.page-about .visit-tail {
  margin: clamp(18px, 3vw, 26px) 0 0;
  color: var(--steel);
  font-size: 14px;
  line-height: 1.8;
}

/* 通用行内链接与回到顶部 */
.page-about .ab-link {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  text-decoration-color: rgba(0, 229, 195, .6);
}
.page-about .ab-link:hover { text-decoration-color: var(--orange); }
.page-about .ab-link:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }
.page-about .about-top {
  margin: clamp(26px, 5vw, 46px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
}

@media (min-width: 700px) {
  .page-about .method-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .principle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .visit-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .coord-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: start;
    column-gap: clamp(28px, 4vw, 56px);
  }
  .page-about .origin-figure { margin-top: 6px; }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    grid-template-areas:
      "media text"
      "media note";
    column-gap: clamp(24px, 3.6vw, 48px);
    row-gap: clamp(18px, 2.6vw, 28px);
    align-items: start;
  }
  .page-about .team-media { grid-area: media; }
  .page-about .team-text { grid-area: text; }
  .page-about .team-note { grid-area: note; }

  .page-about .timeline { padding-left: 0; }
  .page-about .timeline::before { left: 196px; }
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    column-gap: clamp(26px, 4vw, 54px);
    align-items: start;
  }
  .page-about .tl-item::before { left: 191px; top: 16px; }
  .page-about .tl-year { text-align: right; margin-bottom: 0; padding-top: 2px; }

  .page-about .cert-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }
  .page-about .visit-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .page-about .principle-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .about-h1 { letter-spacing: -.03em; }
  .page-about .coord-board { padding: clamp(24px, 2.4vw, 34px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-link,
  .page-about .principle-card,
  .page-about .method-item {
    transition: none;
  }
}
<<<END>>>