.page-about {
  --about-rail: 92px;
  --about-num-size: clamp(44px, 10vw, 72px);
  --about-gap: clamp(14px, 2.4vw, 22px);
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about :focus-visible {
  outline: 2px dashed var(--orange);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(24px, 4.5vw, 48px) clamp(20px, 4vw, 40px);
  border-bottom: 1px solid var(--line-strong);
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 13px 13px;
  background-position: 0 0;
}

.page-about .about-hero__head {
  max-width: 48rem;
  overflow: hidden;
  padding-left: 4px;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
  transform: skewX(-3.5deg);
  transform-origin: left center;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-tiles {
  list-style: none;
  margin: clamp(22px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-tile {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 18px;
  background: var(--sheen);
  color: var(--ink);
}

.page-about .about-tile--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-tile--green {
  background: var(--green);
  color: var(--sheen);
}

.page-about .about-tile__num {
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: clamp(24px, 5.2vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-tile--ink .about-tile__num {
  color: var(--gold);
}

.page-about .about-tile__label {
  font-size: 13px;
  line-height: 1.55;
  opacity: 0.85;
}

/* ---------- 章节框架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(8px, 2vw, 20px);
  padding-top: clamp(12px, 2.4vw, 24px);
}

.page-about .about-toc {
  position: sticky;
  top: 56px;
  z-index: 6;
  background: var(--paper);
  border-bottom: 1px solid var(--line-strong);
  padding-block: 8px 6px;
}

.page-about .about-toc__title {
  display: none;
  margin: 0;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--char);
}

.page-about .about-toc__list {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 2px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: block;
  white-space: nowrap;
  padding: 7px 10px;
  border: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--char);
  text-decoration: none;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--green);
  border-color: var(--green);
  color: var(--sheen);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-block: clamp(26px, 4.4vw, 46px);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(16px, 3vw, 26px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-chapter__num {
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: var(--about-num-size);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter__label {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--char);
}

.page-about .about-chapter__title {
  margin: 0 0 4px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 24em;
}

.page-about .about-prose {
  max-width: 34em;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-prose p {
  margin: 0;
}

.page-about .about-prose p + p {
  margin-top: 13px;
}

/* ---------- 年份刻度轴 ---------- */
.page-about .about-axis__hint {
  margin: 22px 0 0;
  padding-left: 10px;
  border-left: 1px solid var(--line-strong);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--char);
}

.page-about .about-axis {
  list-style: none;
  margin: 10px 0 0;
  padding: 14px 0 4px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-top: 1px solid var(--line-strong);
  scrollbar-width: thin;
}

.page-about .about-axis__item {
  position: relative;
  flex: 0 0 96px;
  padding: 22px 8px 0 0;
  cursor: default;
}

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line-strong);
}

.page-about .about-axis__dot {
  position: absolute;
  top: 4px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--green);
}

.page-about .about-axis__v {
  display: block;
  font-family: var(--f-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--gold-text);
  letter-spacing: 0.04em;
}

.page-about .about-axis__name {
  display: block;
  margin-top: 2px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-axis__note {
  display: block;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  font-size: 12px;
  line-height: 1.55;
  color: var(--char);
  border-left: 2px solid var(--orange);
  padding-left: 6px;
  transition: max-height 0.26s var(--ease), opacity 0.2s var(--ease), margin-top 0.2s var(--ease);
}

.page-about .about-axis__item:hover .about-axis__note,
.page-about .about-axis__item:focus .about-axis__note,
.page-about .about-axis__item:focus-within .about-axis__note {
  max-height: 130px;
  opacity: 1;
  margin-top: 7px;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3.4vw, 32px) 0 0;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  background: var(--moss);
}

.page-about .about-figure--cut .about-figure__img {
  aspect-ratio: 16 / 9;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.page-about .about-figure--narrow {
  max-width: 42rem;
}

.page-about .about-figure__cap {
  margin-top: 8px;
  padding-left: 10px;
  border-left: 1px solid var(--line-strong);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--char);
}

/* ---------- 团队条形 ---------- */
.page-about .about-bar {
  display: flex;
  height: 20px;
  margin-top: clamp(20px, 3.4vw, 30px);
  border: 1px solid var(--ink);
  background: var(--sheen);
}

.page-about .about-bar__seg {
  display: block;
  height: 100%;
}

.page-about .about-bar__seg--edit {
  flex: 7 1 0;
  background: var(--green);
}

.page-about .about-bar__seg--data {
  flex: 4 1 0;
  background: var(--orange);
}

.page-about .about-bar__seg--plan {
  flex: 3 1 0;
  background: var(--sky);
}

.page-about .about-keys {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.page-about .about-key {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-key::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  background: var(--kc, var(--green));
}

.page-about .about-key--green { --kc: var(--green); }
.page-about .about-key--orange { --kc: var(--orange); }
.page-about .about-key--sky { --kc: var(--sky); }

/* ---------- 数据色块 ---------- */
.page-about .about-band {
  margin-top: clamp(20px, 3.6vw, 32px);
  padding: clamp(18px, 3.6vw, 30px);
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 14px, 100% 0, 100% calc(100% - 16px), 0 100%);
}

.page-about .about-band__title {
  margin: 0 0 16px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(19px, 3.4vw, 26px);
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(246, 241, 228, 0.22);
  border: 1px solid rgba(246, 241, 228, 0.22);
}

.page-about .about-stat {
  background: var(--ink);
  padding: 12px 12px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(246, 241, 228, 0.82);
}

/* ---------- 四宫格原则 ---------- */
.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 3.2vw, 28px);
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-principle {
  background: var(--sheen);
  padding: 14px 16px 16px;
  transition: background-color 0.2s var(--ease);
}

.page-about .about-principle[open] {
  background: var(--moss);
}

.page-about .about-principle > summary {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-principle > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-principle__mark {
  width: 12px;
  height: 12px;
  background: var(--orange);
}

.page-about .about-principle__name {
  letter-spacing: 0.04em;
}

.page-about .about-principle__plus {
  font-family: var(--f-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--green);
  transition: transform 0.22s var(--ease);
}

.page-about .about-principle[open] .about-principle__plus {
  transform: rotate(45deg);
}

.page-about .about-principle > p {
  margin: 10px 0 0 22px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
}

/* ---------- 界面逻辑列表 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(18px, 3.2vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__num {
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--gold-text);
}

.page-about .about-flow__item h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-flow__item p {
  margin: 5px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--char);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 38px);
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(20px, 3.8vw, 28px);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__lead {
    font-size: 18px;
  }

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

  .page-about .about-tile {
    padding: 18px 18px 22px;
  }

  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    padding-top: 32px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 76px;
    align-self: start;
    border-bottom: 0;
    border-left: 2px solid var(--green);
    padding: 0 0 0 14px;
    background: transparent;
  }

  .page-about .about-toc__title {
    display: block;
    margin-bottom: 12px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-toc__link {
    border: 0;
    border-bottom: 1px solid var(--line);
    padding: 8px 6px;
    font-size: 13px;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: transparent;
    color: var(--rust);
    border-bottom-color: var(--orange);
    box-shadow: inset 3px 0 0 var(--orange);
    padding-left: 10px;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(16px, 3vw, 36px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 84px;
    align-self: start;
  }

  .page-about .about-chapter__label {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    font-size: 12px;
  }

  .page-about .about-prose {
    font-size: 17px;
  }

  .page-about .about-axis {
    overflow: visible;
  }

  .page-about .about-axis__item {
    flex: 1 1 0;
    min-width: 0;
    padding-right: 10px;
  }

  .page-about .about-band__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stat {
    padding: 16px 16px 20px;
  }

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

  .page-about .about-flow__item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 16px;
    padding: 18px 0;
  }
}

@media (min-width: 1180px) {
  .page-about .about-band {
    margin-right: -1px;
  }

  .page-about .about-band__title {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__note,
  .page-about .about-principle,
  .page-about .about-principle__plus,
  .page-about .about-toc__link {
    transition: none;
  }

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