.page-about {
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .breadcrumb {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.75rem) clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line-strong);
  background:
    radial-gradient(110% 80% at 88% -10%, rgba(56, 242, 208, 0.13), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(245, 165, 36, 0.08), transparent 60%),
    var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(216, 222, 226, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(216, 222, 226, 0.06) 1px, transparent 1px);
  background-size: var(--grid-cell) var(--grid-cell);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.2vw, 3.8rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__accent {
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 1.1rem 0 0;
  max-width: 58ch;
  font-size: clamp(0.9375rem, 1.6vw, 1.0625rem);
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

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

/* ---------- 首屏数据带 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts > div {
  background: rgba(11, 27, 43, 0.94);
  padding: 0.95rem 1.05rem;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-facts dd {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 横向索引 ---------- */
.page-about .about-index {
  background: var(--ink-800);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--text-soft);
  text-decoration: none;
  border-right: 1px solid var(--line);
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-index__link .mono {
  color: var(--cyan);
  font-size: 0.75rem;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  background: rgba(56, 242, 208, 0.07);
}

/* ---------- 档案章节 ---------- */
.page-about .about-part {
  position: relative;
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-part__inner {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-part__side {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .about-part__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 4.5vw, 3.25rem);
  line-height: 1;
  font-weight: 700;
  color: rgba(56, 242, 208, 0.55);
}

.page-about .about-part__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-part__main h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 2.7vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-part__main > p {
  margin: 0 0 1rem;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-part__main h3 {
  font-family: var(--font-display);
  font-weight: 700;
}

/* ---------- 时间轴 ---------- */
.page-about .about-track {
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.4rem;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 1.35rem 0.35rem;
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -1.47rem;
  top: 0.42rem;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-track__mark {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-track__title {
  margin: 0.2rem 0 0.25rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-track__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 图示 ---------- */
.page-about .about-figure {
  margin: 1.6rem 0 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

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

/* ---------- 分类数字 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1px;
  margin-top: 1.5rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-split__item {
  background: var(--ink-800);
  padding: 1.15rem 1.1rem;
}

.page-about .about-split__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-split__title {
  margin: 0.5rem 0 0.35rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-split__item p:last-child {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 纸本区 ---------- */
.page-about .about-part--paper {
  background: var(--paper);
  border-bottom: 1px solid var(--haze);
}

.page-about .about-part--paper .about-part__num {
  color: rgba(11, 27, 43, 0.26);
}

.page-about .about-part--paper .about-part__label {
  color: var(--ink-700);
}

.page-about .about-part--paper .about-part__main h2 {
  color: var(--paper-ink);
}

.page-about .about-part--paper .about-part__main > p {
  color: #33424f;
}

.page-about .about-part--paper .about-figure {
  background: #fff;
  border-color: var(--haze);
}

.page-about .about-part--paper .media-frame__caption {
  color: var(--ink-700);
  background: #fff;
  border-top: 1px solid var(--haze);
}

/* ---------- 改版对比 ---------- */
.page-about .about-compare {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.page-about .about-compare__col {
  padding: 1.15rem;
  background: #fff;
  border: 1px solid var(--haze);
}

.page-about .about-compare__col--now {
  border-color: var(--sage);
  box-shadow: inset 3px 0 0 var(--sage);
}

.page-about .about-steps {
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps li {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 0.42rem 0;
  font-size: 0.9375rem;
  color: #33424f;
  border-bottom: 1px dashed rgba(11, 27, 43, 0.16);
}

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

.page-about .about-steps .mono {
  font-size: 0.75rem;
  color: var(--ink-700);
}

.page-about .about-compare__col--now .about-steps .mono {
  color: #3f6b52;
}

/* ---------- 文档类型 ---------- */
.page-about .about-docs {
  display: grid;
  gap: 1px;
  margin-top: 1.6rem;
  background: var(--haze);
  border: 1px solid var(--haze);
}

.page-about .about-docs__item {
  background: #fff;
  padding: 1.1rem;
}

.page-about .about-docs__title {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--paper-ink);
}

.page-about .about-docs__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #33424f;
}

/* ---------- 折叠档案卡 ---------- */
.page-about .about-fold {
  margin-top: 0.75rem;
  background: rgba(18, 41, 63, 0.62);
  border: 1px solid var(--line-strong);
}

.page-about .about-fold__summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
  transition: background-color 160ms var(--ease);
}

.page-about .about-fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold__summary:hover {
  background: rgba(56, 242, 208, 0.07);
}

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

.page-about .about-fold__num {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-fold__title {
  flex: 1;
}

.page-about .about-fold__chev {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--text-dim);
  border-bottom: 1.5px solid var(--text-dim);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 200ms var(--ease);
}

.page-about .about-fold[open] .about-fold__chev {
  transform: rotate(225deg) translateY(-2px);
}

.page-about .about-fold__body {
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-fold__body p {
  margin: 0.85rem 0 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rate {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-rate__item {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rate__when {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-rate__what {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  background:
    linear-gradient(180deg, rgba(18, 41, 63, 0.9), rgba(11, 27, 43, 0.98));
}

.page-about .about-next__head {
  max-width: 60ch;
}

.page-about .about-next__head h2 {
  margin: 0.5rem 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 2.7vw, 2.1rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-next__lead {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-next__grid {
  display: grid;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: 1px solid var(--line-strong);
}

.page-about .about-next__link {
  display: block;
  padding: 1.15rem 1.1rem;
  background: rgba(11, 27, 43, 0.92);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(56, 242, 208, 0.08);
  border-color: var(--line-cyan);
}

.page-about .about-next__label {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-next__title {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-next__desc {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

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

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

  .page-about .about-rate__item {
    grid-template-columns: minmax(0, 170px) minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-part__inner {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-part__side {
    position: sticky;
    top: 6.5rem;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-fold__summary,
  .page-about .about-fold__chev,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>