.page-about {
  --ab-toc-w: 264px;
  --ab-gap: clamp(20px, 2.6vw, 36px);
  --ab-pad: clamp(22px, 3.6vw, 44px);
  --ab-line: rgba(7, 20, 29, 0.14);
  background: var(--mist);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--mist);
  border-bottom: var(--border-thick) solid var(--ink);
  padding: clamp(26px, 5vw, 56px) 0 clamp(34px, 6vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(31, 224, 192, 0.09) 0 1px, transparent 1px 68px),
    repeating-linear-gradient(90deg, rgba(31, 224, 192, 0.09) 0 1px, transparent 1px 68px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -30%;
  width: 60%;
  height: 90%;
  pointer-events: none;
  background: radial-gradient(circle at 60% 40%, rgba(255, 122, 61, 0.22), transparent 62%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .breadcrumb ol {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(243, 248, 247, 0.7);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--aurora);
  opacity: 0.8;
}

.page-about .breadcrumb a {
  color: var(--aurora);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 224, 192, 0.45);
}

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

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--sand);
  border: 2px solid var(--ink);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2.1rem, 5.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 16ch;
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 54ch;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.8;
  color: rgba(243, 248, 247, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.page-about .about-hero__actions .btn {
  border-radius: 0;
  text-decoration: none;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  border-top: 2px solid rgba(31, 224, 192, 0.35);
}

.page-about .about-hero__meta > div {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(243, 248, 247, 0.22);
}

.page-about .about-hero__meta dt {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--aurora);
  line-height: 1;
  min-width: 3ch;
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  color: rgba(243, 248, 247, 0.78);
}

.page-about .about-hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 6px;
  border: var(--border-thick) solid var(--aurora);
  background: rgba(7, 20, 29, 0.42);
  box-shadow: 9px 9px 0 rgba(31, 224, 192, 0.24);
}

.page-about .about-orbit {
  display: block;
  width: 100%;
  max-width: 440px;
  height: auto;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  padding-top: clamp(26px, 4.5vw, 58px);
  padding-bottom: clamp(34px, 5vw, 72px);
}

.page-about .about-toc {
  border: var(--border-thick) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
  padding: 16px 16px 14px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  font-size: 0.84rem;
  color: var(--deep);
  text-decoration: none;
  background: var(--mist);
  border: 2px solid var(--ink);
  white-space: nowrap;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc__list a .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: var(--aurora);
  border-color: var(--deep);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--ab-gap);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  border: var(--border-thick) solid var(--ink);
  padding: var(--ab-pad);
  box-shadow: var(--shadow-hard);
}

.page-about .about-chapter--deep {
  background: var(--deep);
  color: var(--mist);
}

.page-about .about-chapter--mist {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-chapter--ink {
  background: var(--ink);
  color: var(--mist);
}

.page-about .about-chapter__tab {
  position: absolute;
  top: -3px;
  right: -3px;
  padding: 5px 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--sand);
  border: var(--border-thick) solid var(--ink);
}

.page-about .about-chapter--deep .about-chapter__tab,
.page-about .about-chapter--ink .about-chapter__tab {
  background: var(--orange);
}

.page-about .about-chapter__head {
  margin-bottom: clamp(20px, 3vw, 32px);
  padding-right: 60px;
}

.page-about .about-chapter__idx {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .about-chapter--mist .about-chapter__idx {
  color: var(--aurora-ink);
}

.page-about .about-chapter__head h2 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: rgba(243, 248, 247, 0.8);
}

.page-about .about-chapter--mist .about-chapter__lead {
  color: var(--rock);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
  min-width: 0;
}

.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 0.96rem;
  line-height: 1.82;
  color: rgba(243, 248, 247, 0.86);
}

.page-about .about-chapter--mist .about-text p {
  color: var(--ink);
}

.page-about .about-points {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-points li {
  padding: 11px 14px;
  font-size: 0.9rem;
  line-height: 1.62;
  color: rgba(243, 248, 247, 0.82);
  background: rgba(31, 224, 192, 0.07);
  border-left: 4px solid var(--aurora);
}

.page-about .about-points strong {
  color: var(--mist);
  font-weight: 700;
}

.page-about .about-chapter--mist .about-points li {
  color: var(--ink);
  background: rgba(5, 42, 59, 0.05);
}

.page-about .about-chapter--mist .about-points strong {
  color: var(--deep);
}

.page-about .about-figure {
  margin: 0;
  border: var(--border-thick) solid var(--ink);
  background: var(--mist);
  padding: 8px;
  box-shadow: 6px 6px 0 rgba(31, 224, 192, 0.3);
}

.page-about .about-chapter--mist .about-figure {
  box-shadow: 6px 6px 0 rgba(5, 42, 59, 0.16);
}

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

.page-about .about-figure .media__caption,
.page-about .about-horizon .media__caption {
  display: block;
  padding: 8px 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--rock);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: flex;
  gap: 12px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-about .about-stage {
  flex: 0 0 78%;
  min-width: 0;
  scroll-snap-align: start;
  padding: 18px 16px;
  background: var(--deep);
  color: var(--mist);
  border: var(--border-thick) solid var(--ink);
  box-shadow: 5px 5px 0 rgba(7, 20, 29, 0.16);
  transition: box-shadow 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-stage:hover {
  border-color: var(--orange);
  box-shadow: 9px 9px 0 rgba(255, 122, 61, 0.28);
}

.page-about .about-stage__idx {
  display: block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--aurora);
}

.page-about .about-stage__name {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.14rem;
  font-weight: 900;
  color: var(--mist);
}

.page-about .about-stage__text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: rgba(243, 248, 247, 0.78);
}

.page-about .about-horizon {
  margin: 0;
  padding: 8px;
  border: var(--border-thick) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .about-team__card {
  padding: 18px 16px;
  background: rgba(243, 248, 247, 0.06);
  border: 2px solid rgba(31, 224, 192, 0.5);
  border-left-width: 6px;
}

.page-about .about-team__role {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--aurora);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: rgba(243, 248, 247, 0.82);
}

.page-about .about-note {
  margin: 18px 0 0;
  padding: 12px 14px;
  font-size: 0.86rem;
  line-height: 1.72;
  color: rgba(243, 248, 247, 0.72);
  border-left: 3px solid var(--sand);
  background: rgba(231, 194, 122, 0.08);
}

.page-about .about-chapter--mist .about-note {
  color: var(--rock);
  background: rgba(231, 194, 122, 0.18);
  border-left-color: var(--deep);
}

.page-about .about-chapter--mist .about-note a {
  color: var(--aurora-ink);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 运营机制 ---------- */
.page-about .about-lanes {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border: var(--border-thick) solid var(--ink);
  background: var(--paper);
}

.page-about .about-lane {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 6px 14px;
  padding: 18px 16px;
  border-bottom: 2px dashed var(--ab-line);
}

.page-about .about-lane:last-child {
  border-bottom: 0;
}

.page-about .about-lane__num {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--aurora);
  border: 2px solid var(--ink);
}

.page-about .about-lane__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--deep);
}

.page-about .about-lane__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 生态合作 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-eco__card {
  padding: 18px 16px;
  background: var(--mist);
  color: var(--ink);
  border: var(--border-thick) solid var(--ink);
  box-shadow: 5px 5px 0 rgba(31, 224, 192, 0.32);
  transition: box-shadow 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-eco__card:hover {
  border-color: var(--orange);
  box-shadow: 9px 9px 0 rgba(255, 122, 61, 0.3);
}

.page-about .about-eco__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 900;
  color: var(--deep);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.74;
  color: var(--rock);
}

/* ---------- 数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  border: 2px solid rgba(31, 224, 192, 0.42);
  background: rgba(31, 224, 192, 0.06);
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--aurora);
  background: rgba(31, 224, 192, 0.14);
}

.page-about .about-stat__num {
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--aurora);
}

.page-about .about-stat__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--sand);
}

.page-about .about-stat__label {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-stat__note {
  font-size: 0.76rem;
  line-height: 1.6;
  color: rgba(243, 248, 247, 0.62);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-next__card {
  display: block;
  padding: 18px 16px;
  text-decoration: none;
  color: var(--ink);
  background: var(--mist);
  border: var(--border-thick) solid var(--ink);
  box-shadow: 6px 6px 0 rgba(5, 42, 59, 0.16);
  transition: box-shadow 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--orange);
  box-shadow: 10px 10px 0 rgba(255, 122, 61, 0.3);
}

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

.page-about .about-next__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 900;
  color: var(--deep);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.74;
  color: var(--rock);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 2px solid rgba(31, 224, 192, 0.35);
  }

  .page-about .about-hero__meta > div {
    flex-direction: column;
    gap: 8px;
    padding: 14px 0;
    border-bottom: 0;
    border-right: 1px dashed rgba(243, 248, 247, 0.22);
    padding-right: 12px;
  }

  .page-about .about-hero__meta > div:last-child {
    border-right: 0;
  }

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

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

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

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

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

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    overflow: visible;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--ab-toc-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 84px;
  }

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

  .page-about .about-toc__list a {
    white-space: normal;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-eco__card,
  .page-about .about-stat,
  .page-about .about-next__card,
  .page-about .about-toc__list a {
    transition: none;
  }
}
<<<END>>>