.page-about {
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .page-about__crumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .breadcrumb__list {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--tide);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(30px, 5vw, 68px) clamp(48px, 8vw, 108px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -16%;
  width: min(760px, 86%);
  height: 118%;
  pointer-events: none;
  border-radius: var(--radius-l);
  transform: rotate(-7deg);
  background: linear-gradient(148deg, rgba(124, 92, 255, 0.26), rgba(53, 240, 208, 0.1) 52%, rgba(7, 26, 43, 0) 78%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  max-width: 16ch;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 36px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

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

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--aqua);
}

.page-about .about-stats__label {
  font-size: 13px;
  color: var(--tide);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-l);
  background: var(--ink-800);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 10px 16px;
  border-top-right-radius: var(--radius-s);
  background: rgba(7, 26, 43, 0.78);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 主体：索引 + 连续画布 ---------- */
.page-about .about-body {
  display: grid;
  gap: 8px;
  padding-bottom: clamp(64px, 10vw, 128px);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--tide);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  padding: 8px 0;
  font-size: 13px;
  color: var(--tide);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--aqua);
}

.page-about .about-stream {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(36px, 5.5vw, 68px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 92px;
}

.page-about .about-stream > .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .about-chapter__mark {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .about-chapter p {
  max-width: var(--measure);
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

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

/* ---------- 标签行 ---------- */
.page-about .about-tagrow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

/* ---------- 航线装饰线 ---------- */
.page-about .about-route {
  display: block;
  width: min(320px, 100%);
  height: auto;
  margin-top: 26px;
  color: var(--aqua);
  opacity: 0.75;
}

/* ---------- 岗位分工 ---------- */
.page-about .about-roles {
  margin: 24px 0 26px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-roles li {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__name {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--aqua);
}

.page-about .about-roles__desc {
  margin: 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--tide);
}

/* ---------- 年份时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 6px;
  margin: 26px 0 0;
  padding-left: 44px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--aqua), var(--violet) 55%, var(--coral));
  opacity: 0.55;
}

.page-about .tl-node {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 20px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--aqua);
}

.page-about .tl-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node > summary:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 4px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .tl-title {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .tl-node[open] .tl-year {
  color: var(--aqua);
}

.page-about .tl-node > summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--tide);
}

.page-about .tl-node[open] > summary::after {
  content: "收起";
  color: var(--kelp);
}

.page-about .tl-body {
  padding-bottom: 20px;
}

.page-about .tl-body p {
  margin: 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 服务范围收束 ---------- */
.page-about .about-next {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, rgba(255, 107, 74, 0.16), rgba(53, 240, 208, 0.1) 70%, rgba(7, 26, 43, 0));
}

.page-about .about-next__title {
  margin: 0;
  max-width: none;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-next__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-roles li {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-index {
    position: sticky;
    top: 40px;
    align-self: start;
    padding-top: clamp(18px, 3vw, 28px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-index__list a {
    border-bottom: 1px solid var(--line);
    padding: 10px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a {
    transition: none;
  }
}
<<<END>>>