.page-about {
  --about-line: rgba(200, 164, 74, .38);
  --about-badge: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
  --about-gap: clamp(26px, 4vw, 52px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 3.5vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-hero__title {
  margin: .3em 0 0;
  font-size: clamp(30px, 5.6vw, 62px);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: .015em;
  color: var(--paper);
}

.page-about .about-hero__lead .lede {
  margin-top: 1.2em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .about-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background:
    linear-gradient(180deg, rgba(200, 164, 74, .16), rgba(200, 164, 74, 0) 46%),
    var(--panel);
  clip-path: var(--chamfer-sm);
}

.page-about .about-cell__k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .about-cell__v {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--gold);
}

.page-about .about-cell__v small {
  margin-left: 4px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--stone);
}

.page-about .about-cell__d {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-line {
  position: relative;
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(18, 20, 26, 0) 0%, rgba(18, 20, 26, .6) 26%, rgba(18, 20, 26, .6) 74%, rgba(18, 20, 26, 0) 100%);
  pointer-events: none;
}

.page-about .about-line > .wrap {
  position: relative;
}

.page-about .about-line__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.5vw, 44px);
  margin-top: clamp(24px, 3vw, 40px);
}

.page-about .about-line__index-label {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--stone);
}

.page-about .about-line__index ul {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 2px 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-line__index ul::-webkit-scrollbar {
  display: none;
}

.page-about .about-line__index a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--stone);
  text-decoration: none;
  border: 1px solid var(--line-2);
  clip-path: var(--chamfer-sm);
  white-space: nowrap;
  transition: color .2s ease, background-color .2s ease, border-color .2s ease;
}

.page-about .about-line__index a:hover,
.page-about .about-line__index a:focus-visible {
  color: var(--gold);
  border-color: var(--gold-soft);
  background: rgba(200, 164, 74, .1);
}

.page-about .about-line__track {
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--about-line);
  display: grid;
  gap: clamp(30px, 4vw, 54px);
}

.page-about .about-line__item {
  position: relative;
}

.page-about .about-line__dot {
  position: absolute;
  left: -33px;
  top: 16px;
  width: 14px;
  height: 14px;
  background: var(--gold);
  clip-path: var(--chamfer-sm);
}

.page-about .about-line__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 62px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
  opacity: .88;
}

.page-about .about-line__body .h3 {
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-line__body p {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-line__media .media {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-line__layout {
    grid-template-columns: 108px minmax(0, 1fr) minmax(170px, 258px);
    align-items: start;
  }

  .page-about .about-line__index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-line__index ul {
    flex-direction: column;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-line__index a {
    justify-content: flex-start;
    width: 100%;
    padding: 0 10px;
  }

  .page-about .about-line__media {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

/* ---------- 团队与规模 ---------- */
.page-about .about-team {
  padding: clamp(44px, 6vw, 92px) 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-team__media .media {
  margin: 0;
}

.page-about .about-team__body .prose {
  margin-top: 0;
}

.page-about .about-team__years {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 40px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat .data-unit {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--stone);
}

.page-about .about-bar {
  display: flex;
  height: 46px;
  margin-top: clamp(20px, 2.6vw, 28px);
  overflow: hidden;
  clip-path: var(--chamfer-sm);
}

.page-about .about-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-bar__seg--eng {
  flex: 0 0 40%;
  background: var(--gold);
}

.page-about .about-bar__seg--ops {
  flex: 0 0 60%;
  background: var(--silver);
}

.page-about .about-team__body .muted {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.75;
}

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5.4fr) minmax(0, 6.6fr);
    align-items: center;
  }
}

/* ---------- 定制能力 ---------- */
.page-about .about-custom__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-custom__card {
  padding: 20px 20px 18px;
  background:
    linear-gradient(180deg, rgba(200, 164, 74, .12), rgba(200, 164, 74, 0) 42%),
    var(--panel);
  clip-path: var(--chamfer-sm);
}

.page-about .about-custom__card summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding-right: 26px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-custom__card summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 6px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-custom__card[open] summary::after {
  content: "–";
}

.page-about .about-custom__year {
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-custom__name {
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--paper);
}

.page-about .about-custom__panel {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .about-custom__panel p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-custom__flow {
  margin-top: clamp(26px, 3.4vw, 44px);
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line-2);
  clip-path: var(--chamfer);
}

.page-about .about-custom__flow-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--stone);
}

.page-about .about-custom__steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-custom__steps li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-custom__steps .mono {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

@media (min-width: 820px) {
  .page-about .about-custom__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

/* ---------- 案例分区 ---------- */
.page-about .about-cases {
  padding: clamp(44px, 6vw, 92px) 0;
}

.page-about .about-cases__lede {
  margin-top: 18px;
  max-width: 40em;
}

.page-about .segmented {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-case {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 38px);
  padding: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .about-case__figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-case__num {
  font-family: var(--font-mono);
  font-size: clamp(52px, 9vw, 96px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-case__unit {
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--silver);
}

.page-about .about-case__body .h3 {
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-case__body p {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-case__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cases__media {
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-cases__media .media {
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .about-case {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }
}

/* ---------- 服务网络 ---------- */
.page-about .about-net__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-net__card {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-net__card .panel-label {
  margin: 0 0 8px;
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--stone);
}

.page-about .about-net__card p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-net__split {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 14px 0 0;
  padding: 12px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-net__split li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--silver);
}

.page-about .about-net__split .mono {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

@media (min-width: 720px) {
  .page-about .about-net__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 资质与检测 ---------- */
.page-about .about-certs {
  padding: clamp(44px, 6vw, 92px) 0;
}

.page-about .about-certs__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-certs__badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: clamp(140px, 34vw, 200px);
  aspect-ratio: 1 / 1.06;
  margin: 0 auto;
  clip-path: var(--about-badge);
  background: linear-gradient(160deg, rgba(200, 164, 74, .28), rgba(42, 33, 72, .92));
}

.page-about .about-certs__num {
  font-family: var(--font-mono);
  font-size: clamp(44px, 8vw, 72px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-certs__label {
  font-size: 10px;
  letter-spacing: .24em;
  color: rgba(236, 233, 226, .72);
}

.page-about .about-certs__body .h2 {
  margin-top: .2em;
}

.page-about .about-certs__body .prose {
  margin-top: 1.2em;
}

.page-about .about-certs__body .link {
  display: inline-block;
  margin-top: 8px;
}

@media (min-width: 860px) {
  .page-about .about-certs__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  }

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

/* ---------- 尾段 ---------- */
.page-about .about-next {
  padding: clamp(40px, 5.5vw, 84px) 0;
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .about-next__inner .h2 {
  margin-top: .2em;
}

.page-about .about-next__inner .prose {
  margin-top: 1.1em;
}

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

@media (min-width: 900px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

/* ---------- 窄屏收紧 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero__side {
    grid-template-columns: 1fr;
  }

  .page-about .about-bar {
    height: auto;
    flex-direction: column;
  }

  .page-about .about-bar__seg {
    flex: 1 1 auto;
    min-height: 38px;
    justify-content: flex-start;
  }

  .page-about .about-custom__flow {
    clip-path: none;
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line__index a,
  .page-about .about-custom__card summary::after {
    transition: none;
  }
}
<<<END>>>