.page-about {
  --arc-line: rgba(58, 58, 50, 0.24);
  --arc-line-soft: rgba(58, 58, 50, 0.12);
  --arc-gold-line: rgba(212, 175, 55, 0.34);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .about-crumbs {
  padding: 14px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: 14px;
  padding: clamp(26px, 4.5vw, 56px) 0;
  color: var(--white);
  background:
    radial-gradient(120% 90% at 84% 10%, rgba(212, 175, 55, 0.22), rgba(212, 175, 55, 0) 58%),
    linear-gradient(155deg, #0B3D2E 0%, #0d352a 52%, #111111 100%);
  border-top: 1px solid var(--line-on-dark);
  border-bottom: 1px solid var(--line-on-dark);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(212, 175, 55, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(212, 175, 55, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.4vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 88px;
  height: 3px;
  margin-top: 18px;
  background: var(--gold);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 50ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.86);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-dossier {
  background: rgba(17, 17, 17, 0.58);
  border: 1px solid var(--arc-gold-line);
  border-top: 3px solid var(--gold);
  padding: 16px 18px 18px;
}

.page-about .about-dossier__tab {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

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

.page-about .about-dossier__item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(212, 175, 55, 0.24);
}

.page-about .about-dossier__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-dossier__key {
  margin: 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-dossier__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--gold-hi);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding-top: clamp(24px, 3.5vw, 44px);
}

.page-about .about-index {
  margin-bottom: clamp(24px, 3.5vw, 40px);
  padding: 10px 0 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--arc-line);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--gold);
  background: var(--white);
}

.page-about .about-index__no {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(26px, 3.6vw, 44px);
  border-top: 1px solid var(--arc-line);
}

.page-about .about-stream > .about-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-sec__no {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 2.9vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-p {
  max-width: 64ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

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

.page-about .about-note {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--paper);
  border-left: 3px solid var(--gold);
}

.page-about .about-note p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 图片容器 ---------- */
.page-about .about-fig {
  margin: 22px 0;
  border: 1px solid var(--arc-line);
}

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

.page-about .about-fig--banner .media__img {
  aspect-ratio: 4 / 3;
}

.page-about .about-fig--file .media__img {
  aspect-ratio: 3 / 4;
}

.page-about .about-fig--wide .media__img {
  aspect-ratio: 2 / 1;
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roles__item {
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--arc-line);
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-roles__item:hover,
.page-about .about-roles__item:focus-within {
  border-color: var(--gold);
  background: var(--white);
}

.page-about .about-roles__item .tag {
  opacity: 0.62;
  transition: opacity 0.18s ease;
}

.page-about .about-roles__item:hover .tag,
.page-about .about-roles__item:focus-within .tag {
  opacity: 1;
}

.page-about .about-roles__name {
  margin: 10px 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-roles__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 内容流程 ---------- */
.page-about .about-flow {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--arc-line);
}

.page-about .about-flow__step {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 0 0 22px 16px;
}

.page-about .about-flow__step:last-child {
  padding-bottom: 0;
}

.page-about .about-flow__num {
  display: block;
  width: 34px;
  height: 34px;
  line-height: 32px;
  text-align: center;
  font-size: 12px;
  color: var(--gold);
  background: var(--cream);
  border: 1px solid var(--arc-gold-line);
  margin-left: -33px;
}

.page-about .about-flow__title {
  margin: 4px 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-flow__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-flow__body .tag {
  opacity: 0.6;
  transition: opacity 0.18s ease;
}

.page-about .about-flow__step:hover .tag {
  opacity: 1;
}

/* ---------- 版本里程 ---------- */
.page-about .about-miles {
  display: grid;
  gap: 20px;
  margin-top: 8px;
}

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

.page-about .about-miles__row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 16px 8px 16px 0;
  border-bottom: 1px solid var(--arc-line);
  transition: background 0.18s ease;
}

.page-about .about-miles__row:hover {
  background: var(--paper);
}

.page-about .about-miles__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-miles__text h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--ink);
}

.page-about .about-miles__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-miles__row .tag {
  grid-column: 2;
  justify-self: start;
  margin-top: 10px;
  opacity: 0.7;
  transition: opacity 0.18s ease;
}

.page-about .about-miles__row:hover .tag {
  opacity: 1;
}

/* ---------- 读者结构 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 4px 0 20px;
  background: var(--arc-line);
  border: 1px solid var(--arc-line);
}

.page-about .about-stats__cell {
  padding: 16px 14px;
  background: var(--paper);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-stats__label {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 折线图 ---------- */
.page-about .about-chart {
  margin: 20px 0;
  padding: 18px 16px 14px;
  background: var(--field);
  border: 1px solid var(--arc-gold-line);
}

.page-about .about-chart__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-chart__frame {
  margin-top: 10px;
}

.page-about .about-chart__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-chart__grid line {
  stroke: rgba(246, 239, 223, 0.16);
  stroke-width: 1;
}

.page-about .about-chart__line {
  fill: none;
  stroke-width: 2;
  transition: stroke-width 0.2s ease, opacity 0.2s ease;
}

.page-about .about-chart__line--a {
  stroke: var(--gold);
}

.page-about .about-chart__line--b {
  stroke: #8FD6B4;
}

.page-about .about-chart__dot--a {
  fill: var(--gold);
}

.page-about .about-chart__dot--b {
  fill: #8FD6B4;
}

.page-about .about-chart__axis text {
  fill: rgba(246, 239, 223, 0.6);
  font-family: var(--font-mono);
  font-size: 12px;
  text-anchor: middle;
}

.page-about .about-chart__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chart__legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(246, 239, 223, 0.82);
  cursor: default;
}

.page-about .about-chart__swatch {
  width: 18px;
  height: 3px;
  display: inline-block;
}

.page-about .about-chart__swatch--a {
  background: var(--gold);
}

.page-about .about-chart__swatch--b {
  background: #8FD6B4;
}

.page-about .about-chart:has(.about-chart__legend-item:nth-child(1):hover) .about-chart__line--a,
.page-about .about-chart:has(.about-chart__legend-item:nth-child(1):hover) .about-chart__dot--a {
  stroke-width: 4;
}

.page-about .about-chart:has(.about-chart__legend-item:nth-child(2):hover) .about-chart__line--b {
  stroke-width: 4;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(22px, 3.2vw, 36px);
  background: var(--midnight);
  border: 1px solid var(--arc-gold-line);
  border-top: 3px solid var(--gold);
  color: var(--white);
}

.page-about .about-partners .about-sec__no {
  color: var(--gold-hi);
}

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

.page-about .about-partners__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.24);
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .about-partners__cell p {
  margin: 6px 0 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-partners__text {
  max-width: 62ch;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.86);
}

/* ---------- 接着看 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: block;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--arc-line);
  text-decoration: none;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--gold);
  background: var(--white);
}

.page-about .about-next__label {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--ink);
}

.page-about .about-next__link:hover .about-next__label,
.page-about .about-next__link:focus-visible .about-next__label {
  color: var(--ink-green);
}

.page-about .about-next__desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

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

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

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-miles {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-fig--file {
    margin: 0;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 224px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding: 16px 14px 18px;
    background: var(--paper);
    border: 1px solid var(--arc-line);
    border-top: 3px solid var(--gold);
  }

  .page-about .about-index__title {
    margin-bottom: 12px;
  }

  .page-about .about-index__nav {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    width: 100%;
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr);
    align-items: center;
    gap: 8px;
    padding: 10px 2px;
    border: 0;
    border-bottom: 1px solid var(--arc-line-soft);
    background: transparent;
    font-size: 13.5px;
    white-space: normal;
  }

  .page-about .about-index__link:last-child {
    border-bottom: 0;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: var(--gold-soft);
    border-bottom-color: var(--gold);
  }

  .page-about .about-partners__stats {
    grid-template-columns: repeat(2, minmax(0, 160px));
    gap: 32px;
  }
}

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

  .page-about .about-fig--banner {
    margin-top: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-roles__item,
  .page-about .about-miles__row,
  .page-about .about-next__link,
  .page-about .about-chart__line {
    transition: none;
  }
}
<<<END>>>