.page-about {
  --ab-rail: 252px;
  --ab-line: rgba(244, 247, 242, .14);
  --ab-glass: rgba(29, 58, 50, .55);
  --ab-soft: rgba(244, 247, 242, .78);
  background: var(--c-night);
  color: var(--c-line);
}

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

.page-about .about-crumbs .breadcrumb {
  font-size: 12.5px;
  color: var(--c-mist);
}

.page-about .about-crumbs .breadcrumb a {
  color: var(--c-mist);
  text-decoration: none;
}

.page-about .about-crumbs .breadcrumb a:hover,
.page-about .about-crumbs .breadcrumb a:focus-visible {
  color: var(--c-lime);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.4vw, 44px) 0 clamp(36px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -16%;
  width: min(660px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 40% 60% 55% 45%;
  background: conic-gradient(from 205deg, rgba(200, 255, 61, .20), rgba(255, 106, 42, .12) 42%, transparent 64%);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(38px, 7vw, 78px);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--c-line);
}

.page-about .about-hero-lead {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: clamp(15.5px, 1.2vw, 17px);
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-fact-num {
  display: block;
  font-size: clamp(19px, 2.6vw, 27px);
  font-weight: 700;
  color: var(--c-lime);
  letter-spacing: -.01em;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--c-mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero-figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 42%;
  height: 46%;
  border-right: 2px solid var(--c-lime);
  border-bottom: 2px solid var(--c-lime);
  border-radius: 0 0 var(--r-md) 0;
  pointer-events: none;
}

.page-about .media {
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 正文分栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(34px, 6vw, 80px);
  align-items: start;
}

.page-about .about-rail-title {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--c-orange);
  text-transform: uppercase;
}

.page-about .about-toc {
  list-style: none;
  counter-reset: toc;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc li {
  counter-increment: toc;
}

.page-about .about-toc a {
  position: relative;
  display: block;
  padding: 9px 10px 9px 34px;
  border-left: 2px solid rgba(244, 247, 242, .12);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--c-mist);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-toc a::before {
  content: counter(toc, decimal-leading-zero);
  position: absolute;
  left: 10px;
  top: 10px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--c-orange);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--c-line);
  border-left-color: var(--c-lime);
  background: rgba(200, 255, 61, .07);
}

.page-about .about-badge {
  margin-top: 22px;
  padding: 18px;
  border: 1px solid rgba(200, 255, 61, .34);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(200, 255, 61, .10), rgba(29, 58, 50, .38));
}

.page-about .about-seal {
  display: block;
  width: 62px;
  height: 62px;
  color: var(--c-lime);
}

.page-about .about-badge-title {
  margin: 12px 0 0;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-line);
}

.page-about .about-badge-text {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--c-mist);
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  scroll-margin-top: calc(var(--h-header) + 20px);
  padding-bottom: clamp(34px, 5vw, 62px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--ab-line);
  padding-top: clamp(34px, 5vw, 62px);
}

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

.page-about .about-chapter h2 {
  margin: 10px 0 0;
  font-family: var(--f-display);
  font-size: clamp(25px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-line);
}

.page-about .about-prose p,
.page-about .about-chapter .prose p {
  margin: 16px 0 0;
  font-size: clamp(15px, 1.1vw, 16.5px);
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .about-pillars {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-pillar {
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--c-orange);
}

.page-about .about-pillar b {
  display: block;
  font-size: 14.5px;
  color: var(--c-line);
}

.page-about .about-pillar span {
  display: block;
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--c-mist);
}

.page-about .about-flow {
  list-style: none;
  counter-reset: flow;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-flow li {
  position: relative;
  padding: 15px 16px 15px 54px;
  border-radius: var(--r-md);
  background: var(--ab-glass);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ab-soft);
}

.page-about .about-flow li::before {
  counter-increment: flow;
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 15px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  color: var(--c-lime);
}

.page-about .about-quote {
  position: relative;
  margin: 28px 0 0;
  padding: 22px 24px;
  border-radius: var(--r-md);
  background: var(--c-paper);
  color: #1b1a12;
  font-size: clamp(15.5px, 1.6vw, 18px);
  font-weight: 600;
  line-height: 1.65;
}

.page-about .about-quote::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px dashed rgba(27, 26, 18, .3);
  border-radius: calc(var(--r-md) - 5px);
  pointer-events: none;
}

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-mist);
}

/* ---------- 时间线 ---------- */

.page-about .about-chapter--journey {
  position: relative;
}

.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 4px;
}

.page-about .filter-btn {
  padding: 8px 14px;
  border: 1px solid rgba(244, 247, 242, .2);
  border-radius: 999px;
  background: transparent;
  color: var(--c-mist);
  font-size: 13px;
  line-height: 1.2;
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .filter-btn:hover,
.page-about .filter-btn:focus-visible {
  color: var(--c-line);
  border-color: rgba(200, 255, 61, .5);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--c-lime);
  border-color: var(--c-lime);
  color: #0b0f0e;
  font-weight: 700;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-lime), var(--c-orange) 62%, rgba(226, 61, 61, .6));
}

.page-about .about-milestone {
  position: relative;
  padding: 16px 18px 16px 56px;
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(29, 58, 50, .55), rgba(11, 15, 14, .35));
}

.page-about .about-milestone[hidden] {
  display: none;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 22px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--c-lime);
  box-shadow: 0 0 0 5px rgba(200, 255, 61, .14);
}

.page-about .about-ms-era {
  display: block;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--c-orange);
}

.page-about .about-ms-title {
  display: block;
  margin-top: 6px;
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-line);
}

.page-about .about-ms-text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ab-line);
}

.page-about .about-team-cell {
  padding: 18px;
  background: var(--c-stand);
}

.page-about .about-team-num {
  display: block;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-lime);
}

.page-about .about-team-role {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-line);
}

.page-about .about-team-text {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-mist);
}

/* ---------- 认证 ---------- */

.page-about .about-trust-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-trust-item {
  padding: 18px 20px;
  border: 1px solid rgba(244, 247, 242, .16);
  border-left: 3px solid var(--c-lime);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(11, 15, 14, .4);
}

.page-about .about-trust-label {
  display: block;
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-orange);
}

.page-about .about-trust-title {
  display: block;
  margin-top: 6px;
  font-size: 15.5px;
  color: var(--c-line);
}

.page-about .about-trust-text {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-details {
  margin-top: 20px;
  border: 1px solid rgba(244, 247, 242, .16);
  border-radius: var(--r-md);
  background: rgba(11, 15, 14, .5);
}

.page-about .about-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-line);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-details summary::after {
  content: "+";
  flex: none;
  font-family: var(--f-mono);
  font-size: 18px;
  color: var(--c-lime);
}

.page-about .about-details[open] summary::after {
  content: "−";
}

.page-about .about-details-body {
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-soft);
}

.page-about .about-details-body p {
  margin: 0;
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  position: relative;
  overflow: hidden;
  padding: clamp(38px, 6vw, 74px) 0;
  background: var(--c-stand);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  left: 46%;
  bottom: -150px;
  width: 170%;
  height: 240px;
  background: linear-gradient(90deg, transparent, rgba(200, 255, 61, .15));
  transform: rotate(-5deg);
  pointer-events: none;
}

.page-about .about-next-inner {
  position: relative;
}

.page-about .about-next h2 {
  margin: 10px 0 0;
  font-family: var(--f-display);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.1;
  color: var(--c-line);
}

.page-about .about-next-links {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  border: 1px solid rgba(244, 247, 242, .16);
  border-radius: var(--r-md);
  color: var(--c-line);
  text-decoration: none;
  transition: border-color .2s ease, background-color .2s ease, transform .2s ease;
}

.page-about .about-next-links a::after {
  content: "→";
  flex: none;
  font-family: var(--f-mono);
  font-size: 17px;
  color: var(--c-orange);
}

.page-about .about-next-links a:hover,
.page-about .about-next-links a:focus-visible {
  border-color: var(--c-lime);
  background: rgba(200, 255, 61, .08);
  transform: translateX(2px);
}

.page-about .about-next-link-text {
  display: block;
  font-size: 15px;
  font-weight: 700;
}

.page-about .about-next-link-sub {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  font-weight: 400;
  line-height: 1.55;
  color: var(--c-mist);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 800px) {
  .page-about .about-next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
  }

  .page-about .about-hero-figure {
    padding-bottom: 18px;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(32px, 4.6vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--h-header) + 22px);
    align-self: start;
  }

  .page-about .about-chapter--journey::before {
    content: "";
    position: absolute;
    left: -26px;
    top: 54px;
    width: 6px;
    height: 132px;
    border-radius: 3px;
    background: linear-gradient(180deg, var(--c-lime), var(--c-orange));
    transform: skewY(-16deg);
    pointer-events: none;
  }
}

@media (max-width: 400px) {
  .page-about .about-milestone {
    padding-left: 48px;
  }

  .page-about .about-timeline::before {
    left: 16px;
  }

  .page-about .about-milestone::before {
    left: 8px;
    width: 15px;
    height: 15px;
  }
}
<<<END>>>