.page-about {
  --about-rail: 216px;
  --about-gap: clamp(28px, 4.6vw, 64px);
  --about-line: rgba(51, 60, 70, .62);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(51, 60, 70, .16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(51, 60, 70, .16) 1px, transparent 1px);
  background-size: 58px 58px;
  padding-bottom: clamp(40px, 6vw, 80px);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--about-line);
}

.page-about .hero__visual {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .hero__visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.65) contrast(1.05);
}

.page-about .hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(14, 17, 22, .97) 0%, rgba(14, 17, 22, .86) 46%, rgba(14, 17, 22, .42) 100%);
}

.page-about .hero__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .hero .crumbs {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--mist);
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .hero .crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .hero .crumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .hero .kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--lava);
  margin: 0 0 14px;
}

.page-about .hero .h1 {
  font-size: clamp(30px, 6.2vw, 72px);
  line-height: 1.08;
  letter-spacing: -.03em;
  max-width: 17ch;
  margin: 0 0 20px;
  color: var(--paper);
}

.page-about .hero .lede {
  max-width: 42ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
  margin: 0 0 28px;
}

.page-about .hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .hero__facts li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .hero__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .hero__facts li:first-child::before {
  background: var(--lava);
}

/* ---------- 索引 + 正文双栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(32px, 5vw, 56px);
}

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

.page-about .toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .toc__title {
  width: 100%;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--mist);
  margin: 0 0 6px;
}

.page-about .toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--fs-12);
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .toc__num {
  font-family: var(--font-mono);
  color: var(--steel);
  letter-spacing: .06em;
}

.page-about .toc__link:hover,
.page-about .toc__link.is-active {
  color: var(--paper);
  border-color: var(--lava);
  background: rgba(255, 90, 33, .1);
}

.page-about .toc__link.is-active .toc__num {
  color: var(--lava);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .toc__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 9px 0 9px 12px;
    justify-content: flex-start;
  }

  .page-about .toc__link:hover,
  .page-about .toc__link.is-active {
    border-left-color: var(--lava);
    background: linear-gradient(90deg, rgba(255, 90, 33, .12), transparent 80%);
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: clamp(38px, 6vw, 76px) 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .index-label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--steel);
  margin: 0 0 12px;
}

.page-about .h2 {
  font-size: clamp(24px, 3.4vw, 44px);
  line-height: 1.16;
  letter-spacing: -.025em;
  color: var(--paper);
  margin: 0 0 16px;
  max-width: 22ch;
}

.page-about .h3 {
  font-size: var(--fs-20);
  line-height: 1.35;
  letter-spacing: -.015em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .prose {
  max-width: 40ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
  margin: 0 0 16px;
}

.page-about .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 226, 213, .45);
  transition: border-color 160ms var(--ease);
}

.page-about .prose a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 四条原则 ---------- */
.page-about .principles {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .principle {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: linear-gradient(180deg, rgba(23, 28, 34, .92), rgba(14, 17, 22, .5));
  border: 1px solid var(--line);
  border-left: 3px solid var(--lava);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .principle:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .principle:nth-child(3) {
  border-left-color: var(--signal);
}

.page-about .principle:nth-child(4) {
  border-left-color: var(--steel);
}

.page-about .principle__num {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  letter-spacing: .08em;
  color: var(--steel);
  margin: 0 0 8px;
}

.page-about .principle .prose {
  max-width: 46ch;
  margin-bottom: 12px;
}

.page-about .principle__how {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--paper);
  margin: 0;
  padding-left: 14px;
  border-left: 1px dashed var(--about-line);
}

@media (min-width: 900px) {
  .page-about .principle:nth-child(odd) {
    margin-right: clamp(20px, 9%, 130px);
  }

  .page-about .principle:nth-child(even) {
    margin-left: clamp(20px, 9%, 130px);
  }
}

.page-about .coord-map {
  display: block;
  width: 100%;
  height: auto;
  margin-top: clamp(26px, 4vw, 44px);
}

/* ---------- 目录表格 ---------- */
.page-about .table-scroll {
  overflow-x: auto;
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(23, 28, 34, .74);
}

.page-about .cat-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--fs-14);
}

.page-about .cat-table caption {
  text-align: left;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--mist);
  border-bottom: 1px solid var(--line);
}

.page-about .cat-table th,
.page-about .cat-table td {
  padding: 14px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(51, 60, 70, .5);
}

.page-about .cat-table th {
  font-size: var(--fs-12);
  letter-spacing: .08em;
  font-weight: 500;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .cat-table td {
  color: var(--mist);
}

.page-about .cat-table td:first-child {
  color: var(--paper);
}

.page-about .cat-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .cat-table tr:last-child td {
  border-bottom: 0;
}

/* ---------- 入口沿革 ---------- */
.page-about .changes {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .change {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .change__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .change__id {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lava);
  line-height: 1;
}

.page-about .mono-tag {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--mist);
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.page-about .change .prose {
  max-width: 56ch;
  margin: 0;
}

/* ---------- 数据带 ---------- */
.page-about .stat-band {
  margin: clamp(38px, 6vw, 76px) 0;
  padding: clamp(34px, 5.5vw, 68px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(29, 36, 44, .92) 0%, rgba(23, 28, 34, .45) 52%, rgba(29, 36, 44, .92) 100%),
    linear-gradient(to right, rgba(51, 60, 70, .2) 1px, transparent 1px);
  background-size: auto, 58px 100%;
}

.page-about .stat-band__title {
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--paper);
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 26ch;
}

.page-about .stat-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .stat:nth-child(1) {
  border-left-color: var(--lava);
}

.page-about .stat:nth-child(3) {
  border-left-color: var(--signal);
}

.page-about .stat:nth-child(5) {
  border-left-color: var(--turf);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  color: var(--paper);
}

.page-about .stat__label {
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .stat-note {
  border-top: 1px dashed var(--about-line);
  padding-top: 16px;
}

.page-about .stat-note summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .stat-note summary::-webkit-details-marker {
  display: none;
}

.page-about .stat-note summary::before {
  content: "+";
  display: inline-block;
  width: 16px;
  color: var(--lava);
}

.page-about .stat-note[open] summary::before {
  content: "−";
}

.page-about .stat-note__body {
  max-width: 68ch;
  padding-top: 14px;
}

.page-about .stat-note__body p {
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
  margin: 0;
}

/* ---------- 运营与分工 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) 0;
  overflow: hidden;
}

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

.page-about .team-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .team-copy .prose {
  max-width: 56ch;
  margin-bottom: 0;
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    align-items: end;
  }
}

.page-about .shift-list {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .shift {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 18px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(51, 60, 70, .55);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .shift:hover {
  transform: translateX(2px);
  border-bottom-color: var(--lava);
}

.page-about .shift__role {
  font-size: var(--fs-16);
  color: var(--paper);
}

.page-about .shift__n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-14);
  color: var(--cyan);
  text-align: right;
  white-space: nowrap;
}

.page-about .shift__desc {
  grid-column: 1 / -1;
  font-size: var(--fs-14);
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .shift {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr) auto;
    align-items: baseline;
  }

  .page-about .shift__desc {
    grid-column: auto;
  }
}

.page-about .cadence {
  padding: clamp(20px, 3vw, 30px);
  background: rgba(23, 28, 34, .7);
  border: 1px solid var(--line);
  border-left: 3px solid var(--turf);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .cadence__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .cadence__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--about-line);
  font-size: var(--fs-14);
}

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

.page-about .cadence__k {
  font-family: var(--font-mono);
  color: var(--signal);
  min-width: 18ch;
}

.page-about .cadence__v {
  color: var(--mist);
}

/* ---------- 更正与署名 ---------- */
.page-about .correction-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 980px) {
  .page-about .correction-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
  }
}

.page-about .fix-steps {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  counter-reset: fix;
}

.page-about .fix-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px dashed var(--about-line);
}

.page-about .fix-step:last-child {
  border-bottom: 1px dashed var(--about-line);
}

.page-about .fix-step__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-20);
  color: var(--lava);
  line-height: 1.2;
}

.page-about .fix-step .prose {
  max-width: 52ch;
  font-size: var(--fs-14);
  margin: 0;
}

.page-about .signature-box {
  padding: clamp(18px, 2.6vw, 26px);
  background: rgba(29, 36, 44, .8);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  margin-bottom: 22px;
}

.page-about .signature-box__label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--mist);
  margin: 0 0 8px;
}

.page-about .signature-box__value {
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0 0 16px;
}

.page-about .correction-figure {
  margin: 0;
}

.page-about .correction-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-lg) 0 var(--r-lg) var(--r-lg);
  overflow: hidden;
}

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

.page-about .closing-note {
  margin-top: clamp(28px, 4vw, 44px);
  max-width: 62ch;
}

.page-about .closing-note p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .closing-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 226, 213, .45);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .shift,
  .page-about .toc__link,
  .page-about .hero .crumbs a {
    transition: none;
  }

  .page-about .shift:hover {
    transform: none;
  }
}
<<<END>>>