.page-about {
  --about-pad: clamp(18px, 3.4vw, 40px);
  --about-rule: var(--line-strong);
  --about-dot: var(--ink);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 14px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--cyan);
}

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

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--fog);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(26px, 5vw, 60px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8.4vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0;
  color: var(--mist);
  font-size: clamp(0.98rem, 2.4vw, 1.1rem);
  line-height: 1.75;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  border-top: 2px solid var(--orange);
  padding-top: 14px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  padding: 14px 12px;
  background: var(--carbon);
}

.page-about .about-stat__num {
  font-size: clamp(1.35rem, 4.4vw, 1.9rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stat:nth-child(2) .about-stat__num,
.page-about .about-stat:nth-child(3) .about-stat__num {
  color: var(--cyan);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* 正文骨架 */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-block: clamp(26px, 4.5vw, 52px) clamp(40px, 6vw, 72px);
}

.page-about .about-toc {
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  padding-block: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fog);
}

.page-about .about-toc__list {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
}

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

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
}

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

.page-about .about-toc__link.is-current {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-toc__idx {
  font-size: 11px;
  color: var(--fog);
}

.page-about .about-toc__link.is-current .about-toc__idx {
  color: var(--orange);
}

.page-about .about-flow {
  display: grid;
  gap: 16px;
  min-width: 0;
}

/* 色块章节 */
.page-about .about-block {
  padding: var(--about-pad);
  border-radius: 2px;
}

.page-about .about-block--paper {
  --about-rule: var(--line-ink);
  --about-dot: var(--paper);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-block--carbon {
  --about-rule: var(--line);
  --about-dot: var(--carbon);
  background: var(--carbon);
  color: var(--paper);
}

.page-about .about-block--ink {
  --about-rule: var(--line-strong);
  --about-dot: var(--ink);
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--line-strong);
}

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-head__num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-block--paper .about-head__num {
  color: var(--red);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4.6vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .about-text {
  max-width: 62ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-text p {
  margin: 0 0 14px;
}

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

.page-about .about-block--paper .about-text {
  color: rgba(6, 26, 47, 0.84);
}

.page-about .about-block--carbon .about-text,
.page-about .about-block--ink .about-text {
  color: var(--mist);
}

.page-about .about-em {
  font-family: var(--font-mono);
  font-size: 1.15em;
  color: var(--orange);
}

.page-about .about-pull {
  max-width: 30ch;
  margin: 24px 0;
  padding-left: 16px;
  border-left: 3px solid var(--orange);
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 5.4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-block--paper .about-pull {
  color: var(--ink);
}

/* 图片 */
.page-about .about-figure {
  margin: 22px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  background: var(--carbon);
}

.page-about .about-figure .figure__caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-about .about-block--paper .about-figure .figure__caption {
  color: rgba(6, 26, 47, 0.58);
}

/* 内容结构 */
.page-about .about-specs {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-spec {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-spec:first-child {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-spec__num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-spec__title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.5;
}

.page-about .about-spec__body {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--mist);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  margin: 22px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 22px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-dot);
  border: 2px solid var(--red);
}

.page-about .about-timeline__year {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--red);
}

.page-about .about-timeline__title {
  margin: 4px 0 6px;
  font-size: 1.05rem;
  line-height: 1.45;
}

.page-about .about-timeline__body {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: rgba(6, 26, 47, 0.8);
}

.page-about .about-more {
  margin-top: 10px;
}

.page-about .about-more > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-more > summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
}

.page-about .about-more[open] > summary::after {
  content: "–";
}

.page-about .about-more p {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: rgba(6, 26, 47, 0.74);
}

.page-about .about-note {
  margin-top: 20px;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: rgba(6, 26, 47, 0.055);
}

.page-about .about-note__title {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(6, 26, 47, 0.82);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-team__card {
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(246, 241, 231, 0.035);
}

.page-about .about-team__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-size: 1.02rem;
  line-height: 1.45;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-facts {
  display: grid;
  gap: 8px;
  margin: 20px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-facts__item {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-facts__item .mono {
  margin-right: 6px;
  font-size: 1rem;
  color: var(--cyan);
}

/* 合作 */
.page-about .about-partner-grid {
  display: grid;
  gap: 16px;
  margin-top: 4px;
}

.page-about .about-partner {
  padding-top: 12px;
  border-top: 2px solid var(--ink);
}

.page-about .about-partner__title {
  margin: 0 0 6px;
  font-size: 1rem;
  line-height: 1.45;
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(6, 26, 47, 0.82);
}

.page-about .about-accolade {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 3.2vw, 1.4rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* 下一步 */
.page-about .about-next__list {
  display: grid;
  gap: 14px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__item {
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-next__title {
  margin: 0 0 4px;
  font-size: 1rem;
  line-height: 1.45;
}

.page-about .about-next__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-block--ink .about-text {
  margin-top: 20px;
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-totop {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-totop:hover {
  color: var(--cyan);
}

@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

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

  .page-about .about-spec {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 4px 16px;
  }

  .page-about .about-spec__num {
    grid-row: 1 / span 2;
    padding-top: 6px;
  }

  .page-about .about-spec__body {
    grid-column: 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-toc {
    position: sticky;
    top: 84px;
    border-bottom: 0;
    padding-block: 4px 0;
    overflow: visible;
  }

  .page-about .about-toc__list {
    display: grid;
    gap: 2px;
    margin-top: 10px;
  }

  .page-about .about-toc__link {
    padding: 7px 0 7px 10px;
    border-bottom: 0;
    border-left: 2px solid var(--line);
    white-space: normal;
  }

  .page-about .about-toc__link.is-current {
    border-left-color: var(--orange);
    background: rgba(255, 106, 26, 0.07);
  }

  .page-about .about-flow {
    gap: 20px;
  }

  .page-about .about-block {
    padding: clamp(26px, 3.2vw, 48px);
  }

  .page-about .about-figure {
    margin-top: 28px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: clamp(3rem, 5.2vw, 4.8rem);
  }

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

  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc {
    position: static;
  }
}
<<<PAGE_CSS_END>>>