.page-about {
  --about-lead: clamp(2.2rem, 5.4vw, 4.4rem);
  --about-pad: clamp(1.5rem, 3.4vw, 3rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(2.6rem, 6vw, 5.4rem) 0 clamp(2rem, 4vw, 3.2rem);
  overflow: hidden;
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.28;
}
.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.55) brightness(0.7);
}
.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 7, 12, 0.55) 0%, rgba(5, 7, 12, 0.92) 62%, var(--ink-950) 100%),
    repeating-linear-gradient(90deg, var(--grid-soft) 0 1px, transparent 1px 72px);
}
.page-about .crumbs {
  margin-bottom: clamp(1.8rem, 4vw, 3.4rem);
}
.page-about .about-hero__title {
  margin: 0.9rem 0 1.2rem;
  font-size: var(--about-lead);
  line-height: 1.06;
  letter-spacing: 0.05em;
  font-weight: 700;
  max-width: 16ch;
}
.page-about .about-hero__lede {
  max-width: 42ch;
  margin-bottom: clamp(2rem, 4.4vw, 3.2rem);
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}
.page-about .afact {
  background: var(--ink-900);
  padding: 1rem 1.1rem 1.15rem;
}
.page-about .afact__label {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.page-about .afact__val {
  margin: 0.45rem 0 0;
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  letter-spacing: 0.02em;
  color: var(--cyan);
}
.page-about .afact:nth-child(2) .afact__val { color: var(--violet); }
.page-about .afact:nth-child(3) .afact__val { color: var(--text); }
.page-about .afact:nth-child(4) .afact__val { color: var(--orange); }

/* ---------- 段号标题 ---------- */
.page-about .about-track__head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--grid-line);
  margin-bottom: clamp(1.8rem, 3.6vw, 2.8rem);
}
.page-about .about-track__num {
  font-size: 0.86rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  border: 1px solid var(--cyan-dim);
  padding: 0.18rem 0.5rem;
  flex: none;
}
.page-about .about-track__head .h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3.2vw, 2.15rem);
  letter-spacing: 0.04em;
  line-height: 1.28;
}

/* ---------- 时间轴 ---------- */
.page-about .about-track__intro {
  max-width: 46ch;
  margin-bottom: clamp(2.4rem, 5vw, 3.6rem);
}
.page-about .milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .milestones::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0.34rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-dim), var(--grid-line) 55%, transparent);
}
.page-about .milestone {
  position: relative;
  padding-left: 2.1rem;
  padding-bottom: clamp(1.6rem, 3.4vw, 2.6rem);
}
.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 0.7rem;
  height: 0.7rem;
  border: 1px solid var(--cyan-dim);
  background: var(--ink-950);
  transform: rotate(45deg);
  transition: border-color var(--t) linear, background var(--t) linear;
}
.page-about .milestone:hover::before,
.page-about .milestone:focus-within::before {
  border-color: var(--cyan);
  background: var(--cyan);
}
.page-about .milestone__year {
  display: inline-block;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}
.page-about .milestone__card {
  border: 1px solid var(--grid-line);
  background: var(--ink-900);
  padding: var(--about-pad);
  transition: border-color var(--t) linear, transform var(--t) linear;
}
.page-about .milestone__card:hover {
  border-color: var(--cyan-dim);
  transform: translateX(2px);
}
.page-about .milestone__card .h3 {
  margin: 0 0 0.55rem;
  font-size: 1.02rem;
  letter-spacing: 0.03em;
}
.page-about .milestone__card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.75;
}

/* ---------- 有迹可循四条 ---------- */
.page-about .about-trace {
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
  background: linear-gradient(180deg, rgba(11, 17, 25, 0.7), rgba(5, 7, 12, 0.2));
}
.page-about .trace-grid {
  row-gap: 1px;
}
.page-about .trace {
  padding: var(--about-pad);
  border: 1px solid var(--grid-line);
  background: var(--ink-900);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: border-color var(--t) linear, box-shadow var(--t) linear;
}
.page-about .trace:hover {
  border-color: var(--cyan-dim);
  box-shadow: 0 0 0 1px rgba(53, 230, 214, 0.14);
}
.page-about .trace__idx {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
  border-left: 2px solid var(--cyan);
  padding-left: 0.55rem;
}
.page-about .trace .h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}
.page-about .trace p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.78;
}

/* ---------- 海南归档网络 ---------- */
.page-about .about-island__grid,
.page-about .about-team__grid,
.page-about .about-partners__grid {
  align-items: start;
}
.page-about .about-island__figure {
  margin-bottom: 1.6rem;
}
.page-about .about-island__text p {
  margin: 0 0 1.15rem;
  color: var(--text);
  line-height: 1.8;
}
.page-about .city-nodes {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}
.page-about .city-node {
  background: var(--ink-900);
  display: grid;
  grid-template-columns: 12px 4.2rem 1fr;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 0.85rem;
  transition: background var(--t) linear;
}
.page-about .city-node:hover {
  background: rgba(53, 230, 214, 0.07);
}
.page-about .city-node__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-dim);
  transition: background var(--t) linear, box-shadow var(--t) linear;
}
.page-about .city-node:hover .city-node__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 230, 214, 0.16);
}
.page-about .city-node__name {
  font-size: 0.92rem;
  letter-spacing: 0.08em;
}
.page-about .city-node__desc {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team__text p {
  margin: 0 0 1.15rem;
  line-height: 1.8;
}
.page-about .team-roles {
  margin: 1.6rem 0 0;
  border-top: 1px solid var(--grid-line);
}
.page-about .team-role {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  align-items: center;
  gap: 0.9rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--grid-line);
}
.page-about .team-role__tag {
  justify-self: start;
}
.page-about .team-role__desc {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.7;
}
.page-about .team-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}
.page-about .about-team__figure {
  margin-top: 1.6rem;
}
.page-about .about-team__figure .figure__caption {
  color: var(--text-dim);
}

/* ---------- 版本 ---------- */
.page-about .about-versions__intro {
  max-width: 46ch;
  margin-bottom: clamp(1.8rem, 3.6vw, 2.6rem);
}
.page-about .version-bar {
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--grid-line);
  scrollbar-width: thin;
}
.page-about .version-chip {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 8.6rem;
  text-align: left;
  padding: 0.85rem 1rem;
  background: var(--ink-900);
  border: 1px solid var(--grid-line);
  color: var(--text-dim);
  font: inherit;
  cursor: pointer;
  transition: border-color var(--t) linear, color var(--t) linear, background var(--t) linear;
}
.page-about .version-chip:hover {
  border-color: var(--cyan-dim);
  color: var(--text);
}
.page-about .version-chip__v {
  font-size: 1.1rem;
  letter-spacing: 0.08em;
}
.page-about .version-chip__t {
  font-size: 0.78rem;
  line-height: 1.5;
}
.page-about .version-chip.is-current {
  border-color: var(--cyan);
  background: rgba(53, 230, 214, 0.08);
  color: var(--text);
}
.page-about .version-chip.is-current .version-chip__v {
  color: var(--cyan);
}
.page-about .version-grid {
  margin-top: clamp(1.6rem, 3.4vw, 2.4rem);
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}
.page-about .version-note {
  background: var(--ink-900);
  padding: var(--about-pad);
}
.page-about .version-note .h3 {
  margin: 0 0 0.5rem;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
  color: var(--cyan-mist);
}
.page-about .version-note p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.78;
}

/* ---------- 合作 ---------- */
.page-about .about-partners__text p {
  margin: 0 0 1.15rem;
  line-height: 1.8;
}
.page-about .about-partners__meta {
  margin: 1.8rem 0 0;
  display: grid;
  gap: 0.9rem;
  border-top: 1px solid var(--grid-line);
  padding-top: 1.2rem;
}
.page-about .about-partners__meta dt {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.page-about .about-partners__meta dd {
  margin: 0.3rem 0 0;
  font-size: 0.92rem;
  color: var(--text);
}
.page-about .about-partners__list {
  margin-top: 1.6rem;
}
.page-about .partner-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}
.page-about .partner-row {
  background: var(--ink-900);
  display: grid;
  grid-template-columns: 3.6rem 1fr;
  grid-template-areas:
    "k t"
    "k d";
  gap: 0.15rem 1rem;
  padding: 1rem 1.1rem;
  transition: background var(--t) linear;
}
.page-about .partner-row:hover {
  background: rgba(138, 107, 255, 0.08);
}
.page-about .partner-row__k {
  grid-area: k;
  align-self: center;
  font-size: 1.4rem;
  color: var(--violet);
  letter-spacing: 0.04em;
}
.page-about .partner-row__t {
  grid-area: t;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
}
.page-about .partner-row__d {
  grid-area: d;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--grid-line);
}
.page-about .next-list .index-list__item {
  border-bottom: 1px solid var(--grid-line);
  padding: clamp(1.2rem, 3vw, 1.9rem) 0;
}
.page-about .next-list .index-list__body p {
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.78;
  margin: 0.5rem 0 1.1rem;
  max-width: 48ch;
}
.page-about .about-next__note {
  margin-top: 1.6rem;
  font-size: 0.88rem;
}
.page-about .about-next__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
  transition: color var(--t) linear, border-color var(--t) linear;
}
.page-about .about-next__note a:hover {
  color: var(--cyan-mist);
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .version-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .trace-grid {
    column-gap: 1px;
  }
  .page-about .about-island__figure,
  .page-about .about-team__figure,
  .page-about .about-partners__list {
    margin-top: 0;
  }
  .page-about .about-island__figure {
    margin-bottom: 0;
  }
  .page-about .milestone {
    width: 50%;
    padding-left: 2.4rem;
  }
  .page-about .milestone--left {
    margin-left: 0;
    margin-right: auto;
    padding-right: 2.4rem;
    padding-left: 0;
    text-align: right;
  }
  .page-about .milestone--left::before {
    left: auto;
    right: -0.35rem;
  }
  .page-about .milestone--left .milestone__card:hover {
    transform: translateX(-2px);
  }
  .page-about .milestone--right {
    margin-left: auto;
    margin-right: 0;
  }
  .page-about .milestone--right::before {
    left: -0.35rem;
  }
  .page-about .milestones::before {
    left: 50%;
    transform: translateX(-0.5px);
  }
  .page-about .version-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .partner-row {
    grid-template-columns: 4.2rem 11rem 1fr;
    grid-template-areas: "k t d";
    align-items: center;
    gap: 1.2rem;
  }
  .page-about .partner-row__k {
    font-size: 1.7rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    max-width: 14ch;
  }
  .page-about .city-node {
    grid-template-columns: 14px 5rem 1fr;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>
</<|endoftext|>