.page-about {
  --about-rail: 236px;
  --about-frame: var(--line-100);
}

/* ---------- 面包屑与页首 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(14px, 2.6vw, 26px);
}

.page-about .about-masthead {
  position: relative;
  isolation: isolate;
  padding: clamp(34px, 6vw, 76px) 0 clamp(28px, 4.5vw, 58px);
  border-bottom: 1px solid var(--about-frame);
  overflow: hidden;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -30%;
  left: 58%;
  width: 86%;
  height: 190%;
  transform: rotate(15deg);
  background:
    linear-gradient(180deg, rgba(43, 242, 206, 0.1), rgba(8, 20, 48, 0) 58%),
    linear-gradient(180deg, rgba(255, 176, 58, 0.07), rgba(8, 20, 48, 0) 44%);
  pointer-events: none;
}

.page-about .about-masthead__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.page-about .about-masthead__stamp {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--warn);
  border: 1px solid rgba(255, 176, 58, 0.4);
  padding: 4px 10px;
}

.page-about .about-masthead__title {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 8.4vw, 104px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--ink-050);
  max-width: 14em;
}

.page-about .about-masthead__sub {
  margin: 16px 0 0;
  font-size: clamp(14px, 1.6vw, 17px);
  letter-spacing: 0.02em;
  color: var(--accent-soft);
}

.page-about .about-masthead__foot {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .about-masthead__lede {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-dim);
}

.page-about .about-masthead__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  background: var(--about-frame);
  border: 1px solid var(--about-frame);
}

.page-about .about-masthead__fact {
  background: var(--navy-900);
  padding: 14px 16px 16px;
}

.page-about .about-masthead__fact dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.page-about .about-masthead__fact dd {
  margin: 8px 0 0;
  font-size: 19px;
  color: var(--accent);
  letter-spacing: -0.01em;
}

@media (min-width: 900px) {
  .page-about .about-masthead__foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  }
}

/* ---------- 章节索引 + 正文列 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
  padding-top: clamp(30px, 4.6vw, 60px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  color: var(--slate-400);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: block;
  padding: 8px 12px;
  border: 1px solid var(--about-frame);
  color: var(--text-dim);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.12s ease, color 0.12s ease, background-color 0.12s ease;
}

.page-about .about-toc__list a .mono {
  color: var(--accent);
  margin-right: 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-color: var(--accent);
  color: var(--ink-050);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(22px, 2.6vw, 38px);
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--about-frame);
    padding-bottom: 0;
  }

  .page-about .about-toc__list li {
    border-bottom: 1px solid var(--about-frame);
  }

  .page-about .about-toc__list a {
    border: 0;
    padding: 13px 14px;
    width: 100%;
    box-sizing: border-box;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    background: var(--navy-800);
    border-color: transparent;
  }
}

.page-about .about-stream {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-stream {
    border-left: 1px solid var(--about-frame);
    padding-left: clamp(24px, 3vw, 46px);
  }
}

/* ---------- 分区骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(30px, 4.4vw, 58px);
  border-top: 1px solid var(--about-frame);
  scroll-margin-top: 96px;
}

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

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-section__num {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 3vw, 33px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-050);
}

.page-about .about-section__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 40em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-dim);
}

.page-about .about-section__lede a,
.page-about .about-version__link a,
.page-about .about-prose a {
  color: var(--accent-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(156, 246, 230, 0.45);
}

.page-about .about-section__lede a:hover,
.page-about .about-version__link a:hover,
.page-about .about-prose a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.page-about .about-section__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.95;
  color: var(--slate-400);
  padding-left: 16px;
  border-left: 1px solid var(--accent);
}

/* ---------- 01 正文错位 ---------- */
.page-about .about-prose p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-dim);
}

.page-about .about-prose p + p {
  margin-top: 20px;
}

@media (min-width: 720px) {
  .page-about .about-prose p:nth-child(2) {
    margin-left: clamp(0px, 4vw, 58px);
  }
}

/* ---------- 02 关系图 ---------- */
.page-about .about-tree {
  overflow-x: auto;
  padding-bottom: 6px;
  border: 1px solid var(--about-frame);
  background:
    linear-gradient(180deg, rgba(8, 20, 48, 0.75), rgba(4, 9, 26, 0.4)),
    repeating-linear-gradient(90deg, rgba(30, 44, 71, 0.5) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(30, 44, 71, 0.5) 0 1px, transparent 1px 56px);
}

.page-about .about-tree__svg {
  display: block;
  width: 100%;
  min-width: 660px;
  height: auto;
}

.page-about .about-tree__lines path {
  fill: none;
  stroke: var(--line-100);
  stroke-width: 1.25;
}

.page-about .about-tree__node rect {
  fill: var(--navy-800);
  stroke: var(--line-100);
  stroke-width: 1;
}

.page-about .about-tree__node--root rect {
  fill: var(--navy-700);
}

.page-about .about-tree__node--warn rect {
  stroke: rgba(255, 176, 58, 0.6);
}

.page-about .about-tree__node--leaf rect {
  fill: var(--navy-900);
  stroke: rgba(43, 242, 206, 0.28);
}

.page-about .about-tree__node text {
  fill: var(--ink-050);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.page-about .about-tree__node--root text {
  fill: var(--accent);
}

.page-about .about-tree__node--leaf text {
  fill: var(--text-dim);
}

.page-about .about-tree__hint {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate-400);
}

@media (min-width: 1000px) {
  .page-about .about-tree__hint {
    display: none;
  }
}

/* ---------- 03 编审 ---------- */
.page-about .about-review {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-review__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-frame);
  border: 1px solid var(--about-frame);
}

.page-about .about-review__step {
  background: var(--navy-900);
  padding: 20px 20px 22px;
}

.page-about .about-review__step-num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--warn);
  border: 1px solid rgba(255, 176, 58, 0.38);
  padding: 3px 8px;
}

.page-about .about-review__step-title {
  margin: 14px 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-050);
}

.page-about .about-review__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-review__figure {
  margin: 0;
}

@media (min-width: 880px) {
  .page-about .about-review {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

.page-about .about-fields {
  margin-top: clamp(26px, 3.6vw, 42px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--about-frame);
}

.page-about .about-fields__label {
  margin: 0 0 14px;
  color: var(--slate-400);
}

.page-about .about-fields__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fields__list li {
  padding: 7px 13px;
  border: 1px solid var(--about-frame);
  font-size: 13px;
  color: var(--text-dim);
  background: rgba(14, 33, 72, 0.55);
}

.page-about .about-fields__list li:nth-child(9) {
  border-color: rgba(43, 242, 206, 0.42);
  color: var(--accent-soft);
}

.page-about .about-fields__list li:nth-child(12) {
  border-color: rgba(255, 176, 58, 0.42);
  color: var(--warn-soft);
}

/* ---------- 04 版本切换 ---------- */
.page-about .about-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-version__bar {
  display: inline-flex;
  flex-wrap: wrap;
  max-width: 100%;
  border: 1px solid var(--about-frame);
  margin-bottom: 22px;
}

.page-about .about-version__bar .tab {
  border: 0;
  border-right: 1px solid var(--about-frame);
  padding: 11px 18px;
  font-size: 13px;
  letter-spacing: 0.04em;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}

.page-about .about-version__bar .tab:last-child {
  border-right: 0;
}

.page-about .about-version__bar .tab[aria-selected="true"] {
  background: var(--navy-700);
  color: var(--ink-050);
  box-shadow: inset 0 -2px 0 0 var(--accent);
}

.page-about .about-version__bar .tab:hover {
  color: var(--ink-050);
}

.page-about .about-version__panel p {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-dim);
}

.page-about .about-version__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-version__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--slate-400);
}

.page-about .about-version__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--accent);
}

.page-about .about-version__link {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--slate-400);
}

.page-about .about-version__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-version {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }
}

/* ---------- 05 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-frame);
  background: var(--navy-900);
  padding: clamp(22px, 3vw, 36px) clamp(16px, 3vw, 32px);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-timeline__track {
  position: relative;
  z-index: 1;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-timeline__list {
  position: relative;
  display: flex;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 1000px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 38px;
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(255, 176, 58, 0.06),
    rgba(255, 176, 58, 0.55) 10%,
    rgba(255, 176, 58, 0.55) 90%,
    rgba(255, 176, 58, 0.06)
  );
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 188px;
  padding-right: 12px;
}

.page-about .about-timeline__year {
  display: block;
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: 0.1em;
  color: var(--warn-soft);
  margin-bottom: 16px;
}

.page-about .about-timeline__dot {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--warn);
  box-shadow: 0 0 0 5px rgba(255, 176, 58, 0.14);
  margin-bottom: 18px;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 22em;
}

@media (min-width: 1180px) {
  .page-about .about-timeline__list {
    min-width: 0;
  }

  .page-about .about-timeline__item {
    flex: 1 1 0;
    min-width: 168px;
  }
}

/* ---------- 06 数字矩阵 ---------- */
.page-about .about-matrix {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--about-frame);
  border-left: 1px solid var(--about-frame);
}

.page-about .about-matrix__cell {
  border-right: 1px solid var(--about-frame);
  border-bottom: 1px solid var(--about-frame);
  padding: 20px 16px 24px;
  background: linear-gradient(180deg, rgba(14, 33, 72, 0.6), rgba(8, 20, 48, 0.15));
}

.page-about .about-matrix__cell dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate-400);
  text-transform: uppercase;
}

.page-about .about-matrix__cell dd {
  margin: 14px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-matrix__num {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .about-matrix__unit {
  font-size: 12px;
  color: var(--slate-400);
}

.page-about .about-matrix__sub {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--warn-soft);
}

.page-about .about-matrix__cell--split {
  background: linear-gradient(180deg, rgba(23, 48, 95, 0.65), rgba(8, 20, 48, 0.2));
}

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

/* ---------- 07 联系 ---------- */
.page-about .about-section--end {
  padding-bottom: 0;
}

.page-about .about-contact {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-contact__list {
  margin: 0;
  border: 1px solid var(--about-frame);
}

.page-about .about-contact__row {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--about-frame);
  background: var(--navy-900);
}

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

.page-about .about-contact__row dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-400);
  text-transform: uppercase;
}

.page-about .about-contact__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-050);
  word-break: break-word;
}

.page-about .about-contact__note {
  max-width: 40em;
}

.page-about .about-contact__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.95;
  color: var(--text-dim);
}

.page-about .about-contact__note p + p {
  margin-top: 16px;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

@media (min-width: 860px) {
  .page-about .about-contact {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  }
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 窄屏防溢出 ---------- */
@media (max-width: 600px) {
  .page-about .about-masthead__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-section__head {
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
  }
}
<<<END>>>