.page-about {
  --about-rail: 176px;
  --about-card: var(--ink-2);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--lime-dark);
}

.page-about .breadcrumb a {
  color: var(--paper-70);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.25rem, 3.5vw, 2rem) clamp(1.75rem, 4.5vw, 3rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  background:
    linear-gradient(155deg, rgba(14, 42, 35, .95), rgba(7, 27, 22, .55));
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 54px;
  height: 54px;
  border-top: 2px solid var(--lime);
  border-left: 2px solid var(--lime);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 54px;
  height: 54px;
  border-right: 2px solid var(--ice);
  border-bottom: 2px solid var(--ice);
  pointer-events: none;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.62) contrast(1.06);
}

.page-about .about-hero__cap {
  margin-top: .65rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--steel);
}

.page-about .about-hero__body {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  justify-content: flex-end;
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 3.4rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: .045em;
  color: var(--paper);
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: clamp(64px, 22vw, 148px);
  height: 3px;
  margin-top: 1rem;
  background: linear-gradient(90deg, var(--lime), rgba(184, 255, 61, 0));
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-70);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(108px, 1fr));
  gap: 1px;
  margin: .25rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: .8rem .9rem;
  background: var(--ink);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .about-hero__lbl {
  font-size: var(--fs-micro);
  letter-spacing: .08em;
  color: var(--steel);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-block: 1px solid var(--line-soft);
  background: rgba(14, 42, 35, .72);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: .7rem;
}

.page-about .about-index__tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-index__list {
  display: flex;
  gap: .35rem;
  margin: 0;
  padding: 0 0 .15rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  padding: .45rem .7rem;
  border: 1px solid var(--line-soft);
  font-size: var(--fs-note);
  color: var(--paper-70);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms linear, border-color 180ms linear, background 180ms linear;
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--lime-dark);
}

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

.page-about .about-index__link:hover .about-index__no,
.page-about .about-index__link:focus-visible .about-index__no {
  color: var(--ink);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(2rem, 5vw, 4rem);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  border-left: 2px solid var(--lime);
  padding-left: .8rem;
}

.page-about .about-chapter__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--lime);
}

.page-about .about-chapter__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  color: var(--steel);
}

.page-about .about-chapter__body {
  min-width: 0;
  max-width: 66ch;
}

.page-about .about-chapter--wide .about-chapter__body {
  max-width: none;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.05rem;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--paper-70);
}

.page-about .about-chapter__body h2 {
  margin: 0 0 1.1rem;
}

.page-about .about-chapter__body a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(89, 224, 200, .38);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 使用处境 ---------- */
.page-about .about-uses {
  display: grid;
  gap: 1px;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-uses li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: .85rem;
  padding: .95rem 1rem;
  background: var(--ink);
  transition: background 180ms linear;
}

.page-about .about-uses li:hover {
  background: var(--ink-2);
}

.page-about .about-uses__no {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  color: var(--lime-dark);
  letter-spacing: .1em;
}

.page-about .about-uses p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--paper-70);
}

/* ---------- 四条内容线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 1rem;
  margin-top: .5rem;
}

.page-about .about-line {
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--lime-dark);
  background: linear-gradient(140deg, rgba(18, 51, 41, .86), rgba(7, 27, 22, .55));
  transition: border-left-color 180ms linear, transform 180ms var(--ease);
}

.page-about .about-line:hover {
  border-left-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .about-line__title {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-about .about-line__no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-line p {
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.85;
  color: var(--paper-70);
}

/* ---------- 图文 ---------- */
.page-about .about-figure {
  margin: 1.6rem 0;
  padding: 8px;
  border: 1px solid var(--line);
  background: rgba(14, 42, 35, .6);
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.7) contrast(1.05);
  transition: filter 220ms linear;
}

.page-about .about-figure:hover .about-figure__img {
  filter: saturate(.95) contrast(1.08);
}

.page-about .about-figure__cap {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--steel);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: .9rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__row {
  display: grid;
  gap: .4rem;
  padding-left: .9rem;
  border-left: 2px solid var(--line);
  transition: border-left-color 180ms linear;
}

.page-about .about-timeline__row:hover,
.page-about .about-timeline__row:focus-within {
  border-left-color: var(--lime);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .about-timeline__card {
  padding: .95rem 1.05rem;
  border: 1px solid var(--line-soft);
  background: var(--about-card);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--paper-70);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 1.2rem;
}

.page-about .about-team__filters {
  display: flex;
  gap: .4rem;
  overflow-x: auto;
  padding-bottom: .5rem;
  margin-bottom: 1rem;
  scrollbar-width: thin;
}

.page-about .about-team__btn {
  flex: none;
  padding: .42rem .85rem;
  border: 1px solid var(--line);
  background: transparent;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--paper-70);
  cursor: pointer;
  transition: color 180ms linear, border-color 180ms linear, background 180ms linear;
}

.page-about .about-team__btn:hover,
.page-about .about-team__btn:focus-visible {
  border-color: var(--ice);
  color: var(--ice);
}

.page-about .about-team__btn[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.page-about [data-filter-item][hidden] {
  display: none;
}

.page-about .about-team__card {
  position: relative;
  padding: 1.05rem 1.1rem 1.15rem;
  border: 1px solid var(--line-soft);
  background: var(--about-card);
  outline: none;
  transition: border-color 180ms linear, background 180ms linear;
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-visible {
  border-color: rgba(184, 255, 61, .5);
  background: var(--ink-3);
}

.page-about .about-team__count {
  margin: 0 0 .4rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-team__role {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.75;
  color: var(--paper-70);
}

.page-about .about-team__more {
  margin: .55rem 0 0;
  font-size: var(--fs-micro);
  line-height: 1.7;
  color: var(--ice);
}

/* ---------- 服务与联络 ---------- */
.page-about .about-trust {
  margin: 1.3rem 0 1.4rem;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(18, 51, 41, .8), rgba(7, 27, 22, .9));
}

.page-about .about-trust__row {
  display: grid;
  gap: .25rem;
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-trust__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: var(--steel);
}

.page-about .about-trust__val {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-trust__mono {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .about-trust .copy-btn {
  padding: .2rem .55rem;
  border: 1px solid var(--line);
  background: transparent;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .08em;
  color: var(--ice);
  cursor: pointer;
  transition: color 180ms linear, border-color 180ms linear, background 180ms linear;
}

.page-about .about-trust .copy-btn:hover,
.page-about .about-trust .copy-btn:focus-visible {
  border-color: var(--ice);
  background: rgba(89, 224, 200, .12);
}

.page-about .about-trust .copy-btn.is-done {
  border-color: var(--lime);
  color: var(--lime);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(127, 191, 31, .12), rgba(7, 27, 22, 0) 55%),
    var(--ink-2);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.25rem;
  padding-block: clamp(1.75rem, 4.5vw, 3rem);
}

.page-about .about-cta__title {
  margin: .35rem 0 .5rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.6vw, 2.05rem);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 44ch;
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--paper-70);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
}

.page-about .about-cta__back {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

.page-about .about-cta__back:hover,
.page-about .about-cta__back:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-trust__row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 6rem;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: .45rem;
  }

  .page-about .about-chapter__no {
    font-size: 2.1rem;
  }

  .page-about .about-timeline__row {
    grid-template-columns: 86px minmax(0, 1fr);
    gap: 1.4rem;
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-timeline__year {
    padding-top: .85rem;
    border-right: 1px solid var(--line-soft);
    padding-right: 1rem;
    text-align: right;
  }

  .page-about .about-team__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 220ms var(--ease), opacity 200ms linear, margin-top 220ms var(--ease);
  }

  .page-about .about-team__card:hover .about-team__more,
  .page-about .about-team__card:focus-visible .about-team__more,
  .page-about .about-team__card:focus-within .about-team__more {
    max-height: 10rem;
    margin-top: .55rem;
    opacity: 1;
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline__row:nth-child(even) {
    margin-left: clamp(0px, 2.5vw, 34px);
  }

  .page-about .about-chapter__body {
    max-width: 72ch;
  }

  .page-about .about-chapter--wide .about-chapter__body {
    max-width: 88ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-figure__img,
  .page-about .about-team__more {
    transition: none;
  }

  .page-about .about-line:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>