.page-about {
  display: block;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about [id] {
  scroll-margin-top: 104px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(132px, 17vh, 208px) var(--gutter) clamp(52px, 7vw, 88px);
  background:
    radial-gradient(110% 82% at 92% 2%, rgba(201, 245, 63, .10), transparent 62%),
    radial-gradient(72% 64% at 4% 100%, rgba(255, 122, 28, .10), transparent 66%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  overflow: hidden;
}

.page-about .about-hero__grid {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 56px);
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(280px, .68fr);
    align-items: end;
    gap: clamp(40px, 5vw, 80px);
  }
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(22px, 3vw, 34px);
  font-size: 13px;
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--lime);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 6.2vw, 70px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 42em;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.85;
  color: rgba(244, 240, 228, .76);
}

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

.page-about .about-fact {
  background: rgba(11, 20, 16, .78);
  padding: clamp(14px, 2vw, 20px);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--lime);
}

.page-about .about-fact__num--paper {
  color: var(--paper);
}

.page-about .about-fact__num--orange {
  color: var(--orange);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ============ 暖纸白长阅读区 ============ */
.page-about .about-sheet {
  background: var(--paper);
  color: var(--ink-950);
  padding: clamp(44px, 6vw, 88px) var(--gutter) clamp(56px, 8vw, 108px);
}

.page-about .about-sheet__inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "toc" "body";
  gap: clamp(32px, 4.5vw, 56px);
}

@media (min-width: 1024px) {
  .page-about .about-sheet__inner {
    grid-template-columns: minmax(0, 1fr) 218px;
    grid-template-areas: "body toc";
    gap: clamp(44px, 5vw, 92px);
  }
}

.page-about .about-sheet__body {
  grid-area: body;
  min-width: 0;
  max-width: 68ch;
}

.page-about .about-toc {
  grid-area: toc;
  align-self: start;
}

@media (min-width: 1024px) {
  .page-about .about-toc {
    position: sticky;
    top: 110px;
  }
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(26, 26, 24, .52);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 12px 0;
  display: flex;
  gap: 20px;
  overflow-x: auto;
  border-top: 1px solid var(--line-paper);
  border-bottom: 1px solid var(--line-paper);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__list a {
  display: inline-block;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(26, 26, 24, .7);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--ink-950);
  border-color: var(--orange);
}

@media (min-width: 1024px) {
  .page-about .about-toc__list {
    display: block;
    padding: 0 0 0 18px;
    border: 0;
    border-left: 1px solid var(--line-paper);
  }
  .page-about .about-toc__list li + li {
    margin-top: 14px;
  }
}

/* ============ 章节 ============ */
.page-about .about-chapter + .about-chapter {
  margin-top: clamp(48px, 7vw, 84px);
  padding-top: clamp(48px, 7vw, 84px);
  border-top: 1px solid var(--line-paper);
}

.page-about .about-chapter__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-chapter__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--ink-950);
}

.page-about .about-chapter p {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(26, 26, 24, .8);
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

/* ============ 配图 ============ */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 40px) 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-paper);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: rgba(26, 26, 24, .56);
}

/* ============ 团队分工矩阵 ============ */
.page-about .about-roles {
  list-style: none;
  margin: clamp(30px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 3vw, 34px);
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-role__head {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-paper);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--ink-950);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(26, 26, 24, .76);
}

/* ============ 产出流程 ============ */
.page-about .about-flow {
  list-style: none;
  counter-reset: about-flow;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-flow > li {
  counter-increment: about-flow;
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 30px) 44px;
  border-left: 1px solid var(--line-paper);
}

.page-about .about-flow > li:last-child {
  padding-bottom: 0;
}

.page-about .about-flow > li::before {
  content: counter(about-flow, decimal-leading-zero);
  position: absolute;
  left: -16px;
  top: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--ink-900);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .02em;
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--ink-950);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(26, 26, 24, .76);
}

/* ============ 里程碑 ============ */
.page-about .about-milestones {
  position: relative;
  isolation: isolate;
  background: var(--ink-950);
  padding: clamp(56px, 8vw, 108px) 0;
  overflow: hidden;
}

.page-about .about-milestones__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .17;
  filter: grayscale(1) contrast(1.2);
}

.page-about .about-milestones__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-milestones__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--lime);
}

.page-about .about-milestones__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-milestones__lede {
  margin: 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-track {
  list-style: none;
  margin: clamp(34px, 5vw, 54px) 0 0;
  padding: 0 0 20px;
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.page-about .about-track::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-track::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}

.page-about .about-track__item {
  position: relative;
  flex: 0 0 auto;
  width: clamp(190px, 58vw, 246px);
  padding: 32px 26px 0 0;
  scroll-snap-align: start;
}

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

.page-about .about-track__item::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(201, 245, 63, .14);
}

.page-about .about-track__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .about-track__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 240, 228, .74);
}

.page-about .about-track__hint {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ============ 伙伴与认可 ============ */
.page-about .about-partners {
  background: var(--paper);
  color: var(--ink-950);
  padding: clamp(52px, 7vw, 100px) var(--gutter);
}

.page-about .about-partners__inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 68px);
}

@media (min-width: 940px) {
  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .about-partners__lead {
  max-width: 58ch;
}

.page-about .about-partners__text {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(26, 26, 24, .8);
}

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

.page-about .about-honor {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 22px);
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.page-about .about-honor__num {
  flex: 0 0 auto;
  min-width: 3.6em;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--ink-950);
}

.page-about .about-honor__text {
  flex: 1 1 180px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(26, 26, 24, .72);
}

/* ============ 下一步 ============ */
.page-about .about-cta {
  max-width: var(--shell);
  margin: clamp(48px, 6vw, 76px) auto 0;
  padding-top: clamp(32px, 4vw, 48px);
  border-top: 1px solid var(--line-paper);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--ink-950);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn--line {
  border-color: var(--line-paper);
  color: var(--ink-950);
}

.page-about .about-cta .btn--line:hover,
.page-about .about-cta .btn--line:focus-visible {
  border-color: var(--ink-950);
}

.page-about .about-cta__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(26, 26, 24, .68);
}

.page-about .about-cta__note a {
  color: var(--ink-950);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-cta__note a:hover,
.page-about .about-cta__note a:focus-visible {
  color: var(--orange);
}

/* ============ 窄屏收敛 ============ */
@media (max-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-flow > li {
    padding-left: 38px;
  }

  .page-about .about-honor__num {
    min-width: 0;
  }
}
<<<END>>>