.page-about {
  --about-rail: 190px;
  --about-gap: clamp(18px, 3vw, 44px);
  --about-line: rgba(36, 26, 22, 0.16);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--indigo);
  color: var(--white);
  padding: clamp(22px, 4vw, 40px) 0 clamp(42px, 7vw, 90px);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(
    90deg,
    var(--blue) 0 20%,
    var(--white) 20% 40%,
    var(--red) 40% 60%,
    var(--green) 60% 80%,
    var(--yellow) 80% 100%
  );
}

.page-about .about-hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(143, 161, 199, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 161, 199, 0.16) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .breadcrumbs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .breadcrumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumbs a:hover {
  color: var(--yellow);
  border-bottom-color: currentColor;
}

.page-about .breadcrumbs__sep {
  color: rgba(255, 253, 247, 0.35);
}

.page-about .breadcrumbs__current {
  color: var(--white);
}

.page-about .about-hero__layout {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

.page-about .about-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yellow);
  border: 1px solid rgba(242, 181, 68, 0.6);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  margin: 0 0 18px;
}

.page-about .about-eyebrow--dark {
  color: var(--rust);
  border-color: rgba(196, 90, 44, 0.5);
}

.page-about .about-eyebrow--light {
  color: var(--yellow);
  border-color: rgba(242, 181, 68, 0.55);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.2vw, 4.1rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.page-about .about-hl {
  color: var(--yellow);
}

.page-about .about-lede {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  line-height: 1.85;
  color: rgba(255, 253, 247, 0.86);
  max-width: 46ch;
  margin: 0 0 26px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-dossier {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: clamp(16px, 2.4vw, 24px);
  box-shadow: 10px 10px 0 -2px rgba(214, 64, 47, 0.85);
  transform: rotate(-1.4deg);
  max-width: 380px;
}

.page-about .about-dossier__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--rust);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
}

.page-about .about-kv {
  display: grid;
  gap: 10px;
  margin: 0;
}

.page-about .about-kv > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(36, 26, 22, 0.25);
}

.page-about .about-kv > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-kv dt {
  font-size: 13px;
  color: rgba(36, 26, 22, 0.72);
}

.page-about .about-kv dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
}

/* ---------- 通用区块 ---------- */
.page-about .about-sec {
  padding: clamp(44px, 6.5vw, 88px) 0;
}

.page-about .about-sec--paper2 {
  background: var(--paper-2);
}

.page-about .about-sec--indigo {
  background: var(--indigo);
  color: var(--white);
}

.page-about .about-head {
  max-width: 68ch;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.6vw, 2.55rem);
  line-height: 1.13;
  letter-spacing: -0.015em;
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-sec--indigo h2,
.page-about .about-cta h2 {
  color: var(--white);
}

.page-about .about-p {
  font-size: clamp(0.95rem, 1.1vw, 1.02rem);
  line-height: 1.9;
  margin: 0 0 16px;
  max-width: 62ch;
  color: rgba(36, 26, 22, 0.86);
}

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

.page-about .about-p--light {
  color: rgba(255, 253, 247, 0.82);
}

/* ---------- 左栏编号章节 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: clamp(14px, 2.4vw, 24px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 0.8;
  color: var(--red);
  letter-spacing: -0.05em;
}

.page-about .about-chapter__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink);
  background: var(--yellow);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-figure--flush {
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--ink);
  border-radius: 10px;
  background: var(--indigo);
  box-shadow: var(--shadow-paper);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: rgba(36, 26, 22, 0.62);
}

.page-about .about-sec--indigo .about-figure img {
  border-color: rgba(255, 253, 247, 0.32);
}

.page-about .about-sec--indigo .about-figure figcaption {
  color: var(--slate);
}

.page-about .about-quote {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 18px 20px;
  border-left: 5px solid var(--red);
  background: var(--paper-2);
  border-radius: 0 10px 10px 0;
}

.page-about .about-quote p {
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.6;
  margin: 0 0 8px;
}

.page-about .about-quote span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(36, 26, 22, 0.62);
}

/* ---------- 服务对照台 ---------- */
.page-about .svc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .svc-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(36, 26, 22, 0.2);
  border-top: 6px solid var(--red);
  border-radius: 12px;
  padding: 16px 16px 18px;
  box-shadow: var(--shadow-paper);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .svc-card:hover,
.page-about .svc-card:focus-within {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lift);
}

.page-about .svc-card--blue { border-top-color: var(--blue); }
.page-about .svc-card--yellow { border-top-color: var(--yellow); }
.page-about .svc-card--green { border-top-color: var(--green); }
.page-about .svc-card--rust { border-top-color: var(--rust); }

.page-about .svc-card__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--rust);
  margin: 0;
}

.page-about .svc-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.3;
  margin: 0;
}

.page-about .svc-card__text {
  flex: 1;
  font-size: 0.86rem;
  line-height: 1.72;
  margin: 0;
  color: rgba(36, 26, 22, 0.8);
}

.page-about .svc-card__link {
  align-self: flex-start;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--indigo);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--red);
}

.page-about .svc-card__link:hover {
  color: var(--red);
}

/* ---------- 档案方法 ---------- */
.page-about .method-list {
  display: grid;
  gap: 12px;
  max-width: 780px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .method-item {
  background: var(--white);
  border: 1px solid var(--about-line);
  border-left: 5px solid var(--blue);
  border-radius: 10px;
  box-shadow: var(--shadow-paper);
}

.page-about .method-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.98rem;
  list-style: none;
}

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

.page-about .method-item summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--red);
}

.page-about .method-item[open] summary::after {
  content: "－";
}

.page-about .method-item__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--white);
  background: var(--indigo);
  padding: 3px 8px;
  border-radius: 4px;
}

.page-about .method-item__body {
  padding: 0 16px 16px;
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(36, 26, 22, 0.82);
  max-width: 62ch;
}

.page-about .method-item__body .mono {
  background: var(--paper-2);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ---------- 编年 ---------- */
.page-about .about-ruler {
  display: block;
  width: 220px;
  max-width: 100%;
  height: auto;
  margin-top: 14px;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 3px;
  background: linear-gradient(
    180deg,
    var(--blue),
    var(--green) 32%,
    var(--yellow) 58%,
    var(--red) 82%,
    var(--rust)
  );
}

.page-about .tl-item {
  position: relative;
  background: var(--white);
  border: 1px solid var(--about-line);
  border-radius: 12px;
  padding: 14px 16px;
  box-shadow: var(--shadow-paper);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px var(--paper-2);
}

.page-about .tl-item--blue::before { background: var(--blue); }
.page-about .tl-item--green::before { background: var(--green); }
.page-about .tl-item--yellow::before { background: var(--yellow); }
.page-about .tl-item--rust::before { background: var(--rust); }

.page-about .tl-item__stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--rust);
  margin: 0 0 6px;
}

.page-about .tl-item h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.35;
  margin: 0 0 6px;
}

.page-about .tl-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(36, 26, 22, 0.8);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .role-list {
  display: grid;
  gap: 12px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .role-item {
  background: var(--white);
  border-left: 4px solid var(--green);
  border-radius: 0 10px 10px 0;
  padding: 12px 16px;
  box-shadow: var(--shadow-paper);
}

.page-about .role-item:nth-child(2) { border-left-color: var(--blue); }
.page-about .role-item:nth-child(3) { border-left-color: var(--yellow); }

.page-about .role-item h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.98rem;
  margin: 0 0 5px;
}

.page-about .role-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(36, 26, 22, 0.8);
}

.page-about .eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .eco-tag {
  position: relative;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  background: var(--indigo);
  color: var(--white);
  outline-offset: 3px;
}

.page-about .eco-tag__note {
  display: none;
}

.page-about .about-figure--team {
  margin: 0;
}

/* ---------- 为什么 ---------- */
.page-about .why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 2vw, 20px);
}

.page-about .why-item {
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: 14px;
  padding: 18px;
  box-shadow: var(--shadow-paper);
}

.page-about .why-item__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--red);
  margin-bottom: 12px;
}

.page-about .why-item:nth-child(2) .why-item__num { color: var(--blue); }
.page-about .why-item:nth-child(3) .why-item__num { color: var(--green); }
.page-about .why-item:nth-child(4) .why-item__num { color: var(--rust); }

.page-about .why-item h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  margin: 0 0 8px;
}

.page-about .why-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(36, 26, 22, 0.82);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--indigo);
  color: var(--white);
  padding: clamp(42px, 6vw, 78px) 0;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: linear-gradient(
    90deg,
    var(--yellow) 0 20%,
    var(--green) 20% 40%,
    var(--red) 40% 60%,
    var(--white) 60% 80%,
    var(--blue) 80% 100%
  );
}

.page-about .about-cta__inner {
  position: relative;
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-cta__box {
  background: rgba(255, 253, 247, 0.06);
  border: 1px solid rgba(255, 253, 247, 0.22);
  border-radius: 14px;
  padding: clamp(16px, 2.4vw, 22px);
}

.page-about .about-cta__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--yellow);
  margin: 0 0 8px;
}

.page-about .about-cta__mail {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2vw, 1.12rem);
  color: var(--white);
  word-break: break-all;
  margin: 0 0 8px;
}

.page-about .about-cta__note {
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--slate);
  margin: 0 0 16px;
}

.page-about .about-cta .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .svc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, 0.85fr);
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: 104px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .eco-tag__note {
    display: block;
    position: absolute;
    left: 0;
    bottom: calc(100% + 10px);
    width: 220px;
    background: var(--ink);
    color: var(--paper);
    font-family: var(--font-body);
    font-size: 0.78rem;
    line-height: 1.6;
    letter-spacing: 0;
    padding: 10px 12px;
    border-radius: 8px;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease);
    pointer-events: none;
    z-index: 3;
  }

  .page-about .eco-tag:hover .eco-tag__note,
  .page-about .eco-tag:focus-visible .eco-tag__note {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 1040px) {
  .page-about .svc-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .why-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .svc-card,
  .page-about .eco-tag__note {
    transition: none;
  }

  .page-about .svc-card:hover,
  .page-about .svc-card:focus-within {
    transform: none;
  }

  .page-about .eco-tag__note {
    transform: none;
  }
}
<<<END>>>