.page-about {
  background: var(--paper);
  color: var(--text);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--paper);
  background:
    radial-gradient(110% 85% at 88% -10%, rgba(110, 143, 179, 0.26), transparent 62%),
    linear-gradient(178deg, var(--ink-0) 0%, var(--ink-1) 54%, var(--ink-2) 100%);
  padding: clamp(48px, 8vw, 100px) 0 clamp(42px, 7vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 64%;
  background: linear-gradient(180deg, rgba(110, 143, 179, 0) 0%, rgba(110, 143, 179, 0.22) 100%);
  clip-path: polygon(0 100%, 0 66%, 14% 46%, 27% 62%, 42% 30%, 58% 54%, 72% 36%, 86% 58%, 100% 44%, 100% 100%);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(244, 238, 227, 0.05) 0 1px, transparent 1px 76px),
    repeating-linear-gradient(0deg, rgba(244, 238, 227, 0.05) 0 1px, transparent 1px 76px);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4.5vw, 52px);
}

.page-about .about-hero .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
  margin: 0 0 clamp(18px, 3vw, 30px);
}

.page-about .about-hero .crumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero .crumbs a:hover {
  color: var(--paper);
}

.page-about .about-hero .crumbs [aria-current="page"] {
  color: var(--cinnabar-soft);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--cinnabar-soft);
  letter-spacing: 0.16em;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 66px);
  line-height: 0.99;
  letter-spacing: -0.03em;
  color: var(--paper);
  margin: 12px 0 0;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 33em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-hero__media {
  border: 1px solid var(--line-dark-strong);
  box-shadow: 12px 12px 0 rgba(8, 19, 36, 0.5);
  background: var(--ink-2);
}

.page-about .about-hero__media .media__caption {
  color: var(--mist);
  font-size: 12.5px;
  line-height: 1.7;
  padding: 10px 2px 0;
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }
}

/* ===== 正文骨架 ===== */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding-top: clamp(28px, 4vw, 44px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 76px);
    align-items: start;
    padding-top: clamp(40px, 5vw, 64px);
  }
}

/* ===== 章节索引 ===== */
.page-about .about-index {
  position: sticky;
  top: calc(var(--bar-h) + 8px);
  z-index: 3;
  background: var(--paper);
  padding: 6px 0 8px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-index__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-soft);
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 7px 11px;
  font-size: 13px;
  color: var(--text-soft);
  text-decoration: none;
  background: var(--paper-3);
  border: 1px solid var(--line-light);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--flag-blue);
}

.page-about .about-index__list a[aria-current="true"] {
  color: var(--cinnabar);
  border-color: rgba(178, 58, 46, 0.5);
  background: rgba(178, 58, 46, 0.06);
}

.page-about .about-index__list a[aria-current="true"] .about-index__num {
  color: var(--cinnabar);
}

@media (min-width: 900px) {
  .page-about .about-index {
    top: calc(var(--bar-h) + 20px);
    background: transparent;
    border-bottom: 0;
    padding: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    margin-top: 12px;
    padding: 0;
  }

  .page-about .about-index__list a {
    width: 100%;
    padding: 8px 0 8px 12px;
    background: none;
    border: 0;
    border-left: 2px solid var(--line-light);
  }

  .page-about .about-index__list a[aria-current="true"] {
    background: none;
    border-left-color: var(--cinnabar);
  }
}

/* ===== 章节 ===== */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--line-light);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(24px, 3vw, 34px);
}

.page-about .about-chapter--narrow {
  max-width: 40rem;
}

.page-about .about-chapter--wide {
  max-width: 100%;
}

.page-about .about-chapter__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 10px 0 clamp(14px, 2vw, 20px);
}

.page-about .about-chapter__lede {
  max-width: 40em;
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-text {
  max-width: 38em;
}

.page-about .about-text p {
  margin: 0 0 1.15em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--text);
}

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

.page-about .about-quote {
  max-width: 28em;
  margin: clamp(22px, 3.6vw, 34px) 0;
  padding: clamp(22px, 3.4vw, 30px);
  background: var(--paper-2);
  border-left: 4px solid var(--cinnabar);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.8vw, 26px);
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-note {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--paper-2);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-note a {
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(178, 58, 46, 0.4);
}

.page-about .about-note a:hover {
  border-bottom-color: var(--cinnabar);
}

/* ===== 三类用户 ===== */
.page-about .about-audience {
  display: grid;
  gap: 16px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 760px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-audience__card {
  background: var(--paper-3);
  border: 1px solid var(--line-light);
  box-shadow: 6px 6px 0 var(--paper-2);
  padding: 20px 18px 22px;
}

.page-about .about-audience__label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--turquoise);
}

.page-about .about-audience__title {
  margin: 0 0 12px;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-audience__gain {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-light);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--cinnabar);
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--turquoise);
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 46px 22px minmax(0, 1fr);
  column-gap: 8px;
  padding-bottom: 22px;
}

.page-about .tl-item__year {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--turquoise);
  padding-top: 3px;
  text-align: right;
}

.page-about .tl-item__axis {
  grid-column: 2;
  position: relative;
}

.page-about .tl-item__axis::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 12px;
  bottom: -24px;
  width: 1px;
  transform: translateX(-50%);
  background: repeating-linear-gradient(180deg, var(--turquoise) 0 5px, transparent 5px 11px);
  opacity: 0.65;
}

.page-about .tl-item:last-child .tl-item__axis::before {
  display: none;
}

.page-about .tl-item__dot {
  position: absolute;
  left: 50%;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--turquoise);
  box-shadow: 0 0 0 4px rgba(47, 127, 115, 0.16);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .tl-item:hover .tl-item__dot {
  background: var(--cinnabar);
  box-shadow: 0 0 0 4px rgba(178, 58, 46, 0.16);
}

.page-about .tl-item__body {
  grid-column: 3;
  min-width: 0;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-light);
  transition: border-color 0.2s var(--ease);
}

.page-about .tl-item:hover .tl-item__body {
  border-bottom-color: rgba(178, 58, 46, 0.55);
}

.page-about .tl-item__title {
  margin: 0 0 4px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .tl-item__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

@media (min-width: 720px) {
  .page-about .tl-item {
    grid-template-columns: 64px 24px minmax(0, 1fr);
    column-gap: 12px;
  }

  .page-about .tl-item__year {
    font-size: 15px;
  }

  .page-about .tl-item__title {
    font-size: 16.5px;
  }
}

.page-about .about-figure {
  margin: clamp(20px, 3.4vw, 32px) 0 0;
  border: 1px solid var(--line-light);
  background: var(--paper-3);
}

/* ===== 团队 ===== */
.page-about .about-cells {
  display: grid;
  gap: 1px;
  margin: clamp(18px, 2.8vw, 26px) 0 clamp(22px, 3vw, 30px);
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

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

.page-about .about-cell {
  background: var(--paper-3);
  padding: 18px 16px 20px;
}

.page-about .about-cell__num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--flag-yellow);
}

.page-about .about-cell__title {
  margin: 0 0 8px;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-subhead {
  margin: clamp(28px, 4vw, 40px) 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-steps {
  list-style: none;
  display: grid;
  gap: 18px;
  margin: 18px 0 0;
  padding: 0;
}

@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-step {
  border-top: 2px solid var(--cinnabar);
  padding-top: 12px;
}

.page-about .about-step__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--text);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ===== 协作网络 ===== */
.page-about .about-net {
  position: relative;
  margin-top: clamp(22px, 3.4vw, 32px);
  min-height: 360px;
  border: 1px solid var(--line-light);
  background:
    radial-gradient(circle at 50% 50%, rgba(47, 127, 115, 0.1), transparent 58%),
    var(--paper-3);
  overflow: hidden;
}

.page-about .about-net::before,
.page-about .about-net::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  border: 1px dashed rgba(110, 143, 179, 0.4);
}

.page-about .about-net::before {
  width: 168px;
  height: 168px;
}

.page-about .about-net::after {
  width: 272px;
  height: 272px;
  border-color: rgba(47, 127, 115, 0.3);
}

.page-about .net-node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 11px;
  font-size: 12.5px;
  line-height: 1.2;
  color: var(--text);
  text-decoration: none;
  background: var(--paper);
  border: 1px solid var(--line-light);
  box-shadow: 3px 3px 0 var(--paper-2);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .net-node::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--flag-blue);
  flex: none;
}

.page-about .net-node:hover,
.page-about .net-node:focus-visible {
  border-color: var(--cinnabar);
  box-shadow: 3px 3px 0 rgba(178, 58, 46, 0.22);
}

.page-about .net-node--core {
  left: 50%;
  top: 50%;
  z-index: 1;
  padding: 10px 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--ink-2);
  border-color: var(--ink-3);
  box-shadow: 4px 4px 0 rgba(11, 27, 51, 0.35);
}

.page-about .net-node--core::before {
  background: var(--turquoise-soft);
}

.page-about .net-node--n {
  left: 50%;
  top: 16%;
}

.page-about .net-node--e {
  left: 76%;
  top: 50%;
}

.page-about .net-node--s {
  left: 50%;
  top: 84%;
}

.page-about .net-node--w {
  left: 24%;
  top: 50%;
}

@media (min-width: 720px) {
  .page-about .about-net {
    min-height: 420px;
  }

  .page-about .about-net::before {
    width: 210px;
    height: 210px;
  }

  .page-about .about-net::after {
    width: 340px;
    height: 340px;
  }

  .page-about .net-node {
    font-size: 13.5px;
    padding: 8px 13px;
  }

  .page-about .net-node--e {
    left: 82%;
  }

  .page-about .net-node--w {
    left: 18%;
  }

  .page-about .net-node--n {
    top: 14%;
  }

  .page-about .net-node--s {
    top: 86%;
  }
}

/* ===== 收尾 ===== */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 30px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .tl-item__dot,
  .page-about .tl-item__body,
  .page-about .net-node {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>