.page-about {
  --stage-1: #0D1B16;
  --stage-2: #0E1F18;
  --stage-3: #11261D;
  --stage-4: #0D1E17;
  --stage-5: #0A1712;
  --stage-6: #08120E;
  --stage-7: #060D0A;
  --cell: #102219;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(31, 224, 160, .10), transparent 62%),
    radial-gradient(80% 70% at 4% 100%, rgba(53, 167, 255, .08), transparent 60%),
    var(--ink);
  overflow: hidden;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
}

.page-about .hero-copy {
  min-width: 0;
}

.page-about .about-h1 {
  margin: 16px 0 0;
  font-size: clamp(38px, 7.4vw, 80px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text);
}

.page-about .about-h1 span {
  display: block;
}

.page-about .about-h1 span:nth-child(2) {
  color: var(--field);
}

.page-about .about-h1 span:nth-child(3) {
  color: var(--text);
  padding-left: .6em;
}

@media (min-width: 960px) {
  .page-about .about-h1 span:nth-child(3) {
    padding-left: 1.1em;
  }
}

.page-about .hero-lede {
  margin: 22px 0 0;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.85;
  color: var(--muted);
  max-width: 54ch;
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 2px solid var(--line);
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.page-about .hero-facts__n {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-facts em {
  font-style: normal;
  font-size: 13px;
  color: var(--muted);
}

.page-about .hero-track {
  min-width: 0;
}

.page-about .hero-track .media-frame {
  border: 2px solid var(--line);
  box-shadow: var(--hard-shadow);
}

.page-about .hero-axis {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .page-about .hero-axis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 10px;
  }

  .page-about .hero-axis::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 6px;
    height: 2px;
    background: var(--line);
  }
}

.page-about .hero-axis__item {
  position: relative;
  padding-top: 0;
  min-width: 0;
}

@media (min-width: 640px) {
  .page-about .hero-axis__item {
    padding-top: 26px;
  }

  .page-about .hero-axis__item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 14px;
    height: 14px;
    background: var(--ink);
    border: 2px solid var(--field);
    transition: background-color 180ms var(--ease);
  }

  .page-about .hero-axis__item:hover::before,
  .page-about .hero-axis__item:focus-within::before {
    background: var(--field);
  }
}

.page-about .hero-axis__yr {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--field);
  letter-spacing: .04em;
}

.page-about .hero-axis__lb {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-toc {
  background: var(--panel);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-toc__list {
  display: flex;
  align-items: stretch;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px 0 13px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-toc__link .mono {
  font-size: 12px;
  color: var(--field);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--blue);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--text);
  border-bottom-color: var(--field);
}

/* ---------- 章节通用 ---------- */
.page-about .about-stage {
  padding: clamp(52px, 7.5vw, 104px) 0;
  border-top: 2px solid var(--line);
  scroll-margin-top: 90px;
}

.page-about .stage-1 { background: var(--stage-1); }
.page-about .stage-2 { background: var(--stage-2); }
.page-about .stage-3 { background: var(--stage-3); }
.page-about .stage-4 { background: var(--stage-4); }
.page-about .stage-5 { background: var(--stage-5); }
.page-about .stage-6 { background: var(--stage-6); }
.page-about .stage-7 { background: var(--stage-7); }

.page-about .about-num {
  margin: 0 0 12px;
  font-size: clamp(40px, 6vw, 72px);
  line-height: .88;
  font-weight: 700;
  color: var(--line);
  font-variant-numeric: tabular-nums;
}

.page-about .about-h2 {
  margin: 0 0 20px;
  font-size: clamp(25px, 3.5vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text);
  max-width: 62ch;
}

.page-about .about-p--tight {
  margin-top: 26px;
}

.page-about .about-link {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 167, 255, .42);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-about .about-note {
  margin: 0;
  padding-left: 15px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .col-note {
    padding-top: 84px;
  }
}

/* ---------- 01 阶段列表 ---------- */
.page-about .phase-list {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--line);
}

.page-about .phase-item {
  position: relative;
  padding: 22px 0 22px 54px;
  border-bottom: 2px solid var(--line);
  transition: background-color 200ms var(--ease), padding-left 200ms var(--ease);
}

.page-about .phase-item:hover {
  background: rgba(31, 224, 160, .045);
  padding-left: 62px;
}

.page-about .phase-item__k {
  position: absolute;
  left: 0;
  top: 25px;
  font-size: 13px;
  font-weight: 600;
  color: var(--field);
  letter-spacing: .08em;
  transition: left 200ms var(--ease);
}

.page-about .phase-item:hover .phase-item__k {
  left: 8px;
}

.page-about .phase-item__t {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--text);
}

.page-about .phase-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 02 规模网格 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scale-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: var(--cell);
}

.page-about .scale-cell__n {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  line-height: 1;
  color: var(--field);
  font-variant-numeric: tabular-nums;
}

.page-about .scale-cell--hot .scale-cell__n {
  color: var(--amber);
}

.page-about .scale-cell__u {
  margin-left: 3px;
  font-size: .48em;
  color: var(--muted);
}

.page-about .scale-cell__l {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 02 折线图 ---------- */
.page-about .about-chart {
  margin: 34px 0 0;
  padding: 22px 18px 12px;
  border: 2px solid var(--line);
  background: rgba(7, 16, 13, .5);
}

.page-about .about-chart__cap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-chart__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.page-about .about-chart__key {
  position: relative;
  padding-left: 18px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-chart__key::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 10px;
  height: 3px;
}

.page-about .about-chart__key--field::before { background: var(--field); }
.page-about .about-chart__key--amber::before { background: var(--amber); }

.page-about .about-chart__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 03 更新节律 ---------- */
.page-about .flow-list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--line);
}

.page-about .flow-item {
  position: relative;
  padding: 22px 0 22px 0;
  border-bottom: 2px solid var(--line);
}

.page-about .flow-item__t {
  display: inline-block;
  margin-bottom: 10px;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink);
  background: var(--field);
}

.page-about .flow-item:nth-child(2) .flow-item__t {
  background: var(--blue);
}

.page-about .flow-item:nth-child(3) .flow-item__t {
  background: var(--amber);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

.page-about .about-flow-media {
  margin: 32px 0 28px;
  border: 2px solid var(--line);
  box-shadow: var(--hard-shadow);
}

/* ---------- 04 词典分类 ---------- */
.page-about .lex-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2px;
  margin: 30px 0 26px;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
}

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

@media (min-width: 1024px) {
  .page-about .lex-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-about .lex-cell {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 16px 14px;
  background: var(--cell);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .lex-cell:hover {
  background: rgba(139, 92, 246, .16);
  color: var(--text);
}

.page-about .lex-cell__i {
  font-size: 11px;
  font-weight: 600;
  color: var(--violet);
  letter-spacing: .06em;
}

/* ---------- 05 档案 ---------- */
.page-about .about-map-media {
  margin: 30px 0 28px;
  border: 2px solid var(--line);
}

/* ---------- 06 团队分工 ---------- */
.page-about .team-list {
  margin: 30px 0 26px;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--line);
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 10px;
  padding: 18px 0;
  border-bottom: 2px solid var(--line);
  transition: background-color 180ms var(--ease);
}

.page-about .team-item:hover {
  background: rgba(53, 167, 255, .05);
}

@media (min-width: 720px) {
  .page-about .team-item {
    grid-template-columns: 48px minmax(0, 150px) minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 18px;
  }
}

.page-about .team-item__k {
  font-size: 13px;
  font-weight: 600;
  color: var(--field);
  letter-spacing: .06em;
}

.page-about .team-item__n {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .team-item__d {
  grid-column: 2 / -1;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .team-item__d {
    grid-column: 3 / -1;
  }
}

/* ---------- 07 CTA ---------- */
.page-about .about-cta {
  margin: 36px 0 24px;
  padding: 26px 22px;
  border: 2px solid var(--line);
  background:
    linear-gradient(135deg, rgba(31, 224, 160, .07), rgba(255, 122, 26, .07)),
    rgba(7, 16, 13, .6);
  box-shadow: var(--hard-shadow);
}

.page-about .about-cta__t {
  margin: 0 0 18px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  color: var(--text);
}

.page-about .about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-back {
  margin-top: 0;
}

/* ---------- 图片容器兜底 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 639px) {
  .page-about .hero-axis__item::before {
    content: "";
    display: block;
    width: 12px;
    height: 12px;
    margin-bottom: 10px;
    background: var(--ink);
    border: 2px solid var(--field);
  }
}

@media (min-width: 900px) {
  .page-about .about-toc__list {
    gap: 34px;
  }
}
<<<END>>>