.page-about {
  --about-line: rgba(11, 31, 58, .14);
  --about-ink-soft: #4a4841;
  --about-team-bg: #e8e6da;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 44px) 0 clamp(36px, 6vw, 76px);
  background:
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 72px),
    var(--cream);
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 6vw, 66px);
  line-height: 1.08;
  letter-spacing: -.035em;
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-hero__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-hero__metrics li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px;
  background: var(--mist);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--deep);
}

.page-about .about-hero__unit {
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--rock);
}

.page-about .about-hero__visual {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-about .about-hero__vnote {
  writing-mode: vertical-rl;
  justify-self: center;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .32em;
  color: var(--rock);
  white-space: nowrap;
}

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

/* ---------- 图片容器 ---------- */
.page-about .figure__frame {
  display: block;
  background: var(--mist);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 44px -34px rgba(11, 31, 58, .6);
}

.page-about .figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .01em;
  color: var(--rock);
}

/* ---------- 章节头部 ---------- */
.page-about .about-sec-head {
  max-width: 760px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-sec-head .eyebrow {
  margin: 0 0 10px;
}

.page-about .section-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(25px, 4vw, 42px);
  line-height: 1.16;
  letter-spacing: -.025em;
  color: var(--deep);
}

.page-about .section-lede {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 01 起点：纵向刻度时间线 ---------- */
.page-about .about-origin {
  background: var(--mist);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .about-tick {
  background: #fff;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  transition: border-color var(--ease), box-shadow var(--ease);
}

.page-about .about-tick[open] {
  border-color: rgba(242, 106, 46, .42);
  box-shadow: 0 16px 34px -28px rgba(11, 31, 58, .65);
}

.page-about .about-tick__head {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 20px;
  gap: 14px;
  align-items: center;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tick__head::marker {
  content: "";
}

.page-about .about-tick__head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  text-align: center;
  color: var(--rock);
}

.page-about .about-tick[open] .about-tick__head::after {
  content: "–";
  color: var(--orange);
}

.page-about .about-tick__no {
  padding-right: 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  letter-spacing: .08em;
  text-align: right;
  color: var(--orange);
  border-right: 1px solid var(--about-line);
}

.page-about .about-tick__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--deep);
}

.page-about .about-tick__body {
  padding: 0 18px 18px;
}

.page-about .about-tick__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 02 团队 ---------- */
.page-about .about-team {
  background: var(--about-team-bg);
}

.page-about .about-team__figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-filter {
  display: grid;
  gap: 16px;
}

.page-about .about-filter .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .about-filter .filter-btn {
  padding: 8px 15px;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.2;
  color: var(--deep);
  background: var(--mist);
  border: 1px solid var(--about-line);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.page-about .about-filter .filter-btn:hover {
  border-color: var(--deep);
}

.page-about .about-filter .filter-btn[aria-pressed="true"] {
  color: var(--deep);
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-filter .filter-count {
  margin-left: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--rock);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-role {
  padding: 16px 18px 18px;
  background: var(--mist);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--deep);
  border-radius: var(--radius-sm);
}

.page-about .about-role[data-tags~="设备适配"] {
  border-left-color: var(--moss);
}

.page-about .about-role[data-tags~="版本复核"] {
  border-left-color: var(--clay);
}

.page-about .about-role[data-tags~="访客支持"] {
  border-left-color: var(--orange);
}

.page-about .about-role__group {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--rock);
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.3;
  color: var(--deep);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

/* ---------- 03 版本与节奏 ---------- */
.page-about .about-release__split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-rhythm__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--deep);
}

.page-about .about-rhythm__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-rhythm__list li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-rhythm__k {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .about-rhythm__v {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .about-rhythm__list p {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

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

.page-about .about-v32 {
  position: relative;
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(22px, 4vw, 38px);
  overflow: hidden;
  color: var(--cream);
  background: var(--deep);
  border-radius: var(--radius);
}

.page-about .about-v32::after {
  content: "V3.2";
  position: absolute;
  right: -6px;
  bottom: -26px;
  font-family: var(--font-mono);
  font-size: clamp(64px, 12vw, 140px);
  letter-spacing: -.05em;
  line-height: 1;
  color: rgba(245, 240, 230, .07);
  pointer-events: none;
}

.page-about .about-v32 > h3 {
  position: relative;
  z-index: 1;
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.4vw, 26px);
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-v32__list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-v32__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-about .about-v32__no {
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--orange-soft);
  border-top: 1px solid rgba(245, 240, 230, .3);
}

.page-about .about-v32 h4 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 15.5px;
  line-height: 1.35;
  color: var(--mist);
}

.page-about .about-v32 p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(245, 240, 230, .8);
}

/* ---------- 04 客户协作 ---------- */
.page-about .about-collab {
  background: var(--mist);
}

.page-about .about-collab__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-service {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
}

.page-about .about-service__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .about-service__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.3;
  color: var(--deep);
}

.page-about .about-service p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

.page-about .about-flow {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--deep);
}

.page-about .about-flow__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 6px 16px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-flow__no {
  padding: 6px 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  text-align: center;
  color: var(--deep);
  background: rgba(11, 31, 58, .07);
  border-radius: 8px;
}

.page-about .about-flow h4 {
  margin: 0 0 5px;
  font-family: var(--font-head);
  font-size: 16px;
  line-height: 1.35;
  color: var(--deep);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(40px, 6vw, 76px) 0;
  overflow: hidden;
  color: var(--cream);
  background: var(--deep);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, rgba(245, 240, 230, .07) 0 1px, transparent 1px 80px);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-cta p {
  max-width: 46em;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 240, 230, .8);
}

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

.page-about .about-cta .btn--ghost {
  color: var(--cream);
  background: transparent;
  border: 1px solid rgba(245, 240, 230, .4);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: end;
  }

  .page-about .about-timeline {
    padding-left: 40px;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 0;
    bottom: 0;
    width: 8px;
    background: repeating-linear-gradient(180deg, var(--scale) 0 1px, transparent 1px 15px);
  }

  .page-about .about-tick__body {
    padding-left: 78px;
  }

  .page-about .about-release__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-v32__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-collab__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tick,
  .page-about .about-filter .filter-btn {
    transition: none;
  }
}
<<<END>>>