.page-about {
  --about-rule: 1px solid var(--line-teal);
  --about-gap: clamp(1.75rem, 4vw, 3.5rem);
  --about-chapter-pad: clamp(2.25rem, 5vw, 4rem);
  color: var(--text-100);
  background: var(--ink-900);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(2rem, 4vw, 3.25rem);
  border-bottom: var(--about-rule);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 74, 61, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 74, 61, .4) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  -webkit-mask-image: linear-gradient(105deg, rgba(0, 0, 0, .85) 0%, transparent 62%);
  mask-image: linear-gradient(105deg, rgba(0, 0, 0, .85) 0%, transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crumbs__item {
  display: inline-flex;
  align-items: center;
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--text-300);
}

.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin: 0 .55rem;
  color: var(--line-teal);
}

.page-about .crumbs__link {
  color: var(--text-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-hero__kicker {
  margin: clamp(1.75rem, 4vw, 3rem) 0 .9rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan-400);
  display: inline-flex;
  align-items: center;
  gap: .65rem;
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--cyan-400);
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -.035em;
  color: var(--white-000);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--text-300);
}

.page-about .about-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  border-top: var(--about-rule);
  border-left: var(--about-rule);
}

.page-about .about-meta__item {
  padding: .95rem 1rem;
  border-right: var(--about-rule);
  border-bottom: var(--about-rule);
  background: rgba(10, 36, 28, .55);
}

.page-about .about-meta dt {
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-300);
  margin-bottom: .4rem;
}

.page-about .about-meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  font-weight: 600;
  color: var(--white-000);
  letter-spacing: -.01em;
}

/* ---------- 主体框架 ---------- */

.page-about .about-body {
  background: var(--ink-900);
}

.page-about .about-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

/* ---------- 索引 ---------- */

.page-about .about-index {
  border-bottom: var(--about-rule);
  padding: 1rem 0 1.1rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__title {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-300);
}

.page-about .about-index__list {
  display: flex;
  gap: .5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: max-content;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .45rem .75rem;
  font-size: .8125rem;
  color: var(--text-300);
  text-decoration: none;
  border: var(--about-rule);
  background: var(--ink-800);
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: .6875rem;
  color: var(--cyan-600);
  letter-spacing: .06em;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white-000);
  border-color: var(--cyan-400);
  background: var(--ink-700);
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--cyan-400);
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding: var(--about-chapter-pad) 0;
  border-bottom: var(--about-rule);
}

.page-about .about-chapter--last {
  border-bottom: 0;
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: .9rem;
  margin-bottom: 1.2rem;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--cyan-400);
  padding-top: .35rem;
  flex: none;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--white-000);
  max-width: 30ch;
}

.page-about .about-chapter__lede,
.page-about .about-chapter__note {
  margin: 0 0 1.75rem;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-300);
}

.page-about .about-chapter__note {
  border-left: 2px solid var(--orange-400);
  padding-left: 1rem;
  color: var(--text-100);
}

.page-about .about-chapter__body--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-chapter__text p {
  margin: 0 0 1.15rem;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-300);
}

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

.page-about .about-chapter__more {
  margin: 1.5rem 0 0;
}

.page-about .about-chapter__more .link-arrow,
.page-about .link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .9375rem;
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, .35);
  padding-bottom: .15rem;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform .2s var(--ease);
}

.page-about .link-arrow:hover,
.page-about .link-arrow:focus-visible {
  color: var(--white-000);
  border-bottom-color: var(--white-000);
}

.page-about .link-arrow:hover::after,
.page-about .link-arrow:focus-visible::after {
  transform: translateX(4px);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  border: var(--about-rule);
  background: var(--ink-800);
  padding: .6rem;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-figure--origin img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--wide {
  margin-top: var(--about-gap);
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--panel {
  margin-top: var(--about-gap);
}

.page-about .about-figure--panel img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure figcaption {
  margin-top: .65rem;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--text-300);
  letter-spacing: .01em;
}

/* ---------- 版本时间线 ---------- */

.page-about .about-versions {
  position: relative;
  margin-bottom: .5rem;
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 1.6rem;
  bottom: 1.6rem;
  width: 1px;
  background: var(--line-teal);
}

.page-about .about-ver {
  position: relative;
  padding-left: 1.6rem;
  border-top: var(--about-rule);
}

.page-about .about-ver:last-child {
  border-bottom: var(--about-rule);
}

.page-about .about-ver::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.45rem;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--cyan-400);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about .about-ver__title {
  margin: 0;
  font-size: 1rem;
}

.page-about .about-ver__trigger {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 1.15rem 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-ver__trigger:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .about-ver__code {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  font-weight: 600;
  color: var(--cyan-400);
  letter-spacing: -.01em;
  flex: none;
  min-width: 5.2ch;
}

.page-about .about-ver__name {
  flex: 1 1 auto;
  font-size: .9375rem;
  color: var(--text-100);
  letter-spacing: .01em;
}

.page-about .about-ver__trigger .accordion__icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.page-about .about-ver__trigger .accordion__icon::before,
.page-about .about-ver__trigger .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--text-300);
  transition: transform .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-ver__trigger .accordion__icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .about-ver__trigger .accordion__icon::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-about .about-ver__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: scaleY(0);
}

.page-about .about-ver__trigger[aria-expanded="true"] .accordion__icon::before,
.page-about .about-ver__trigger:hover .accordion__icon::before {
  background: var(--cyan-400);
}

.page-about .about-ver:hover .about-ver__name {
  color: var(--white-000);
}

.page-about .about-ver__panel {
  padding: 0 0 1.35rem 0;
}

.page-about .about-ver__panel p {
  margin: 0;
  max-width: 64ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--text-300);
  border-left: 2px solid var(--cyan-600);
  padding-left: 1rem;
}

/* ---------- 团队角色 ---------- */

.page-about .about-roles {
  list-style: none;
  margin: 0 0 var(--about-gap);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: var(--about-rule);
  border-left: var(--about-rule);
}

.page-about .about-role {
  padding: 1.25rem 1.15rem;
  border-right: var(--about-rule);
  border-bottom: var(--about-rule);
  background: var(--ink-800);
}

.page-about .about-role__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 600;
  line-height: 1;
  color: var(--white-000);
  letter-spacing: -.03em;
  margin-bottom: .6rem;
}

.page-about .about-role__name {
  display: block;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--cyan-400);
  margin-bottom: .5rem;
  letter-spacing: .02em;
}

.page-about .about-role__desc {
  display: block;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--text-300);
}

/* ---------- 访问线路 ---------- */

.page-about .about-lines {
  border: var(--about-rule);
  background: var(--ink-800);
  padding: 1.25rem 1.15rem;
}

.page-about .about-lines__title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-300);
  padding-bottom: .8rem;
  border-bottom: var(--about-rule);
}

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

.page-about .about-line {
  display: grid;
  grid-template-columns: 2.4ch minmax(0, 1fr);
  grid-template-areas:
    "code name"
    "code desc";
  column-gap: .85rem;
  row-gap: .3rem;
  padding: .9rem 0;
  border-bottom: var(--about-rule);
}

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

.page-about .about-line__code {
  grid-area: code;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--cyan-600);
  padding-top: .2rem;
}

.page-about .about-line__name {
  grid-area: name;
  font-size: .9375rem;
  color: var(--white-000);
  font-weight: 600;
  letter-spacing: .01em;
}

.page-about .about-line__desc {
  grid-area: desc;
  font-size: .8125rem;
  line-height: 1.75;
  color: var(--text-300);
}

/* ---------- 合作卡片 ---------- */

.page-about .about-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: var(--about-rule);
  border-left: var(--about-rule);
}

.page-about .about-card {
  padding: 1.35rem 1.15rem 1.5rem;
  border-right: var(--about-rule);
  border-bottom: var(--about-rule);
  background: var(--ink-800);
  transition: background-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-card:hover {
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-about .about-card--accent {
  background: var(--ink-700);
}

.page-about .about-card--accent .about-card__idx {
  color: var(--orange-400);
  border-color: var(--orange-400);
}

.page-about .about-card__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--cyan-400);
  border: 1px solid var(--cyan-600);
  padding: .2rem .5rem;
  margin-bottom: .9rem;
}

.page-about .about-card__title {
  margin: 0 0 .6rem;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white-000);
  letter-spacing: -.01em;
}

.page-about .about-card__text {
  margin: 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--text-300);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-cadence {
  margin: 0 0 var(--about-gap);
  border-top: var(--about-rule);
}

.page-about .about-cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .35rem;
  padding: 1rem 0;
  border-bottom: var(--about-rule);
}

.page-about .about-cadence__row dt {
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--text-300);
  text-transform: uppercase;
}

.page-about .about-cadence__row dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-100);
}

.page-about .about-cadence__num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--cyan-400);
  letter-spacing: -.01em;
}

.page-about .about-outro {
  border: var(--about-rule);
  border-top: 2px solid var(--cyan-400);
  background: var(--deep-teal);
  padding: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-outro__text {
  margin: 0 0 1.25rem;
  max-width: 58ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--text-100);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-outro .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: .65rem 1.4rem;
  font-size: .875rem;
  letter-spacing: .04em;
  text-decoration: none;
  border: 1px solid var(--cyan-400);
  background: var(--cyan-400);
  color: var(--ink-900);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-outro .btn:hover,
.page-about .about-outro .btn:focus-visible {
  background: var(--white-000);
  border-color: var(--white-000);
  color: var(--ink-900);
}

.page-about .about-outro .btn--ghost {
  background: transparent;
  color: var(--cyan-400);
}

.page-about .about-outro .btn--ghost:hover,
.page-about .about-outro .btn--ghost:focus-visible {
  background: var(--cyan-400);
  color: var(--ink-900);
  border-color: var(--cyan-400);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-cadence__row {
    grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
    align-items: baseline;
    gap: 1rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-body__inner {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
    align-self: start;
    border-bottom: 0;
    border-right: var(--about-rule);
    padding: 0 clamp(1rem, 2vw, 1.75rem) 0 0;
    overflow: visible;
    max-height: calc(100vh - var(--header-h) - 3rem);
    overflow-y: auto;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    min-width: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-top: var(--about-rule);
    background: transparent;
    padding: .8rem .5rem .8rem .8rem;
    border-left: 2px solid transparent;
  }

  .page-about .about-index__item:last-child .about-index__link {
    border-bottom: var(--about-rule);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: var(--ink-800);
    border-left-color: var(--cyan-400);
    border-top-color: var(--line-teal);
  }

  .page-about .about-chapter__body--split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

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

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

@media (min-width: 1200px) {
  .page-about .about-hero__lede {
    font-size: 1.0625rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .link-arrow::after,
  .page-about .about-index__link,
  .page-about .about-ver__trigger .accordion__icon::before,
  .page-about .about-ver__trigger .accordion__icon::after {
    transition: none;
  }

  .page-about .about-card:hover {
    transform: none;
  }

  .page-about .link-arrow:hover::after,
  .page-about .link-arrow:focus-visible::after {
    transform: none;
  }
}
<<<END>>>