.page-about {
  --ab-rail-width: 212px;
  --ab-section-gap: clamp(2.25rem, 6vw, 4.25rem);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumbs {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist);
  margin-bottom: clamp(1.5rem, 4vw, 2.6rem);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .3s var(--ease-soft), border-color .3s var(--ease-soft);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--loud);
  border-bottom-color: var(--neon);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(2rem, 6vw, 4rem) 0 clamp(3rem, 8vw, 5.5rem);
  background:
    radial-gradient(120% 95% at 100% 0%, rgba(43, 227, 160, .16), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 179, 71, .09), transparent 62%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -14%;
  top: 8%;
  width: 58%;
  height: 118%;
  background: linear-gradient(150deg, rgba(22, 59, 49, .92), rgba(11, 31, 26, 0) 72%);
  transform: skewY(-7deg);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.05rem, 7.4vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.022em;
  margin: .55rem 0 1.1rem;
  color: var(--paper);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--neon);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  font-size: clamp(.98rem, 2.4vw, 1.1rem);
  line-height: 1.82;
  color: rgba(244, 239, 228, .78);
  margin: 0 0 1.75rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.68) contrast(1.06) brightness(.86);
  transition: filter .7s var(--ease-soft), transform .9s var(--ease-soft);
}

.page-about .about-hero__media:hover img,
.page-about .about-hero__media:focus-within img {
  filter: saturate(.94) contrast(1.06) brightness(.99);
  transform: scale(1.02);
}

/* ===== 主体双栏 ===== */
.page-about .about-main {
  padding: clamp(2.25rem, 6vw, 4rem) 0 clamp(3rem, 8vw, 5.5rem);
  background: linear-gradient(180deg, rgba(17, 20, 23, .6), rgba(11, 31, 26, 1) 22%);
}

.page-about .about-main__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 4rem);
}

/* 索引栏 */
.page-about .about-rail {
  padding: .55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(22, 59, 49, .5);
}

.page-about .about-rail__label,
.page-about .about-rail__note {
  display: none;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: .25rem;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .42rem .85rem;
  border-radius: var(--radius-pill);
  font-size: .84rem;
  white-space: nowrap;
  color: rgba(244, 239, 228, .68);
  text-decoration: none;
  transition: color .3s var(--ease-soft), background-color .3s var(--ease-soft);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--loud);
  background: rgba(43, 227, 160, .12);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--neon);
}

/* ===== 章节通用 ===== */
.page-about .ab-section {
  padding-top: var(--ab-section-gap);
  border-top: 1px solid var(--line);
  scroll-margin-top: 140px;
}

.page-about .ab-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-section__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.55rem, 4.6vw, 2.55rem);
  line-height: 1.2;
  letter-spacing: -.016em;
  margin: .5rem 0 1.1rem;
  color: var(--paper);
}

.page-about .ab-section .index-tag {
  color: var(--neon);
}

.page-about .ab-body p {
  margin: 0 0 1.05rem;
  font-size: 1rem;
  line-height: 1.86;
  color: rgba(244, 239, 228, .78);
}

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

.page-about .ab-body strong {
  color: var(--loud);
  font-weight: 600;
}

.page-about .ab-body a {
  color: var(--loud);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(43, 227, 160, .45);
  transition: color .3s var(--ease-soft), text-decoration-color .3s var(--ease-soft);
}

.page-about .ab-body a:hover,
.page-about .ab-body a:focus-visible {
  color: var(--neon);
  text-decoration-color: var(--neon);
}

.page-about .ab-note {
  margin: 1.5rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid rgba(43, 227, 160, .5);
  font-size: .9rem;
  line-height: 1.78;
  color: rgba(244, 239, 228, .62);
}

/* ===== 团队分工 ===== */
.page-about .ab-roster {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .9rem;
}

.page-about .ab-roster__item {
  display: grid;
  gap: .5rem;
  align-content: start;
  padding: 1.35rem 1.25rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, rgba(22, 59, 49, .95), rgba(11, 31, 26, .9));
  transition: border-color .4s var(--ease-soft), transform .4s var(--ease-soft);
}

.page-about .ab-roster__item:hover {
  border-color: rgba(43, 227, 160, .48);
  transform: translateY(-3px);
}

.page-about .ab-roster__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--neon);
}

.page-about .ab-roster__role {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-roster__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(244, 239, 228, .68);
}

.page-about .ab-roster__bar {
  display: block;
  height: 4px;
  margin-top: .5rem;
  border-radius: var(--radius-pill);
  background: rgba(143, 166, 156, .2);
  overflow: hidden;
}

.page-about .ab-roster__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--neon));
}

.page-about .ab-roster__fill--edit { width: 43%; }
.page-about .ab-roster__fill--prod { width: 36%; }
.page-about .ab-roster__fill--care { width: 21%; }

/* ===== 图片容器 ===== */
.page-about .ab-figure {
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.7) brightness(.84) contrast(1.08);
  transition: filter .7s var(--ease-soft), transform .9s var(--ease-soft);
}

.page-about .ab-figure:hover img,
.page-about .ab-figure:focus-within img {
  filter: saturate(.92) brightness(.96) contrast(1.08);
  transform: scale(1.015);
}

/* ===== 时间轴 ===== */
.page-about .ab-timeline {
  list-style: none;
  position: relative;
  margin: 2rem 0 0;
  padding: 0 0 0 1.7rem;
  display: grid;
  gap: 1.55rem;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--neon), rgba(43, 227, 160, .08));
}

.page-about .ab-timeline__item {
  position: relative;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.7rem - 1px);
  top: .42rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--neon);
}

.page-about .ab-timeline__when {
  margin: 0 0 .28rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .09em;
  color: var(--amber);
}

.page-about .ab-timeline__head {
  margin: 0 0 .35rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-timeline__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: rgba(244, 239, 228, .68);
}

/* ===== 审校（暖纸反色区） ===== */
.page-about .ab-review {
  margin-top: var(--ab-section-gap);
  padding: clamp(1.5rem, 5vw, 2.9rem);
  border-top: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--paper), #e9e1d1);
  color: var(--ink);
}

.page-about .ab-review .index-tag {
  color: var(--teal);
}

.page-about .ab-review .ab-section__title {
  color: var(--ink);
}

.page-about .ab-review .ab-body p {
  color: rgba(11, 31, 26, .78);
}

.page-about .ab-steps {
  list-style: none;
  counter-reset: abstep;
  margin: 1.7rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
}

.page-about .ab-steps__item {
  counter-increment: abstep;
  padding-top: .85rem;
  border-top: 2px solid rgba(11, 31, 26, .16);
}

.page-about .ab-steps__item::before {
  content: counter(abstep, decimal-leading-zero);
  display: block;
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--teal);
}

.page-about .ab-steps__head {
  margin: 0 0 .3rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-steps__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: rgba(11, 31, 26, .74);
}

/* ===== 服务对象 ===== */
.page-about .ab-audience {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .9rem;
}

.page-about .ab-audience__item {
  display: grid;
  gap: .55rem;
  align-content: start;
  padding: 1.3rem 1.2rem;
  border: 1px solid var(--line);
  border-left: 3px solid rgba(255, 179, 71, .55);
  border-radius: var(--radius-sm);
  background: rgba(22, 59, 49, .42);
  transition: background-color .4s var(--ease-soft), border-left-color .4s var(--ease-soft);
}

.page-about .ab-audience__item:hover {
  background: rgba(22, 59, 49, .8);
  border-left-color: var(--amber);
}

.page-about .ab-audience__head {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-audience__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: rgba(244, 239, 228, .7);
}

.page-about .ab-tags {
  list-style: none;
  margin: .2rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

.page-about .ab-tags li {
  padding: .2rem .65rem;
  border: 1px solid rgba(43, 227, 160, .35);
  border-radius: var(--radius-pill);
  font-size: .75rem;
  letter-spacing: .02em;
  color: var(--loud);
}

/* ===== 备案与联系 ===== */
.page-about .ab-contact {
  position: relative;
}

.page-about .ab-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.6rem);
  align-items: start;
}

.page-about .ab-contact__list {
  margin: 0;
  padding: 1.25rem 1.2rem;
  display: grid;
  gap: .95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(17, 20, 23, .72);
}

.page-about .ab-contact__row {
  display: grid;
  gap: .22rem;
}

.page-about .ab-contact__row dt {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .ab-contact__row dd {
  margin: 0;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ab-contact__foot {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 1.8rem 0 0;
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-about .ab-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.3rem 1.6rem;
  }

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

  .page-about .ab-contact__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-about .ab-section {
    scroll-margin-top: 150px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-main__grid {
    grid-template-columns: var(--ab-rail-width) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.75rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: 148px;
    align-self: start;
    padding: 1.1rem 1rem;
    border-radius: var(--radius-md);
    background: rgba(22, 59, 49, .42);
  }

  .page-about .about-rail__label {
    display: block;
    margin: 0 0 .7rem;
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .14em;
    color: var(--mist);
  }

  .page-about .about-rail__list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    gap: .15rem;
    overflow: visible;
  }

  .page-about .about-rail__list a {
    display: flex;
    justify-content: flex-start;
    width: 100%;
    padding: .48rem .7rem;
    border-left: 2px solid transparent;
    border-radius: var(--radius-sm);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--neon);
  }

  .page-about .about-rail__note {
    display: block;
    margin: 1rem 0 0;
    padding-top: .85rem;
    border-top: 1px solid var(--line);
    font-size: .74rem;
    line-height: 1.65;
    color: var(--mist);
  }

  .page-about .ab-section--origin .ab-body {
    max-width: 68ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__media img,
  .page-about .ab-figure img,
  .page-about .ab-roster__item,
  .page-about .ab-audience__item {
    transition: none;
  }

  .page-about .about-hero__media:hover img,
  .page-about .ab-figure:hover img,
  .page-about .ab-roster__item:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>