.page-about {
  --about-pad-top: clamp(18px, 3vw, 34px);
  --about-chapter-gap: clamp(36px, 7vw, 84px);
  position: relative;
  background:
    radial-gradient(130% 62% at 88% -14%, rgba(200, 255, 61, 0.11), transparent 60%),
    radial-gradient(95% 55% at -8% 14%, rgba(67, 224, 179, 0.07), transparent 62%),
    var(--ink);
  color: var(--mist);
  padding-bottom: clamp(44px, 8vw, 96px);
  overflow-x: hidden;
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: var(--about-pad-top);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  color: var(--line);
}

.page-about .breadcrumb-list a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid var(--line-faint);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 5vw, 56px) 0 clamp(30px, 6vw, 72px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .hero-main .eyebrow {
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 3vw, 26px);
  font-size: clamp(34px, 6.6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--mist);
  max-width: 17ch;
}

.page-about .about-hero .lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 60ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--stone);
}

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

.page-about .hero-side {
  border-top: 1px solid var(--line-soft);
  padding-top: 18px;
}

.page-about .side-note {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 16px;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--line-faint);
}

.page-about .stat-num {
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.01em;
}

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

.page-about .stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--stone);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: var(--about-chapter-gap) 0 0;
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 3vw, 26px);
  align-items: start;
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(16px, 3vw, 26px);
  margin-bottom: clamp(22px, 4vw, 42px);
}

.page-about .chapter-num {
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: rgba(200, 255, 61, 0.6);
}

.page-about .chapter-intro h2 {
  margin: 0 0 12px;
  font-size: clamp(23px, 3.5vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.012em;
  font-weight: 800;
  color: var(--mist);
}

.page-about .chapter-lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.78;
  color: var(--stone);
}

.page-about .chapter-body {
  display: grid;
  gap: clamp(22px, 4vw, 46px);
}

.page-about .chapter-aside .media-frame,
.page-about .coverage-media {
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0;
}

.page-about .media-note {
  margin: 10px 0 0;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

/* ---------- 时间轴折叠组 ---------- */
.page-about .stage .disclosure-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 15px 4px;
  background: linear-gradient(90deg, rgba(12, 43, 33, 0.55), transparent 72%);
  border: 0;
  border-top: 1px solid var(--line-faint);
  color: var(--mist);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .stage:last-child .disclosure-trigger {
  border-bottom: 1px solid var(--line-faint);
}

.page-about .stage .disclosure-trigger:hover,
.page-about .stage .disclosure-trigger:focus-visible {
  background: linear-gradient(90deg, rgba(200, 255, 61, 0.12), transparent 72%);
  outline: none;
}

.page-about .stage .stage-label {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone);
  white-space: nowrap;
}

.page-about .stage[data-open="true"] .stage-label {
  color: var(--lime);
}

.page-about .stage .stage-title {
  font-size: clamp(15px, 1.9vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .stage .disclosure-icon {
  position: relative;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  background:
    linear-gradient(var(--lime), var(--lime)) center / 12px 1px no-repeat,
    linear-gradient(var(--lime), var(--lime)) center / 1px 12px no-repeat;
  transition: transform var(--t-mid) var(--ease);
}

.page-about .stage .disclosure-icon::before,
.page-about .stage .disclosure-icon::after {
  content: none;
}

.page-about .stage[data-open="true"] .disclosure-icon {
  transform: rotate(90deg);
}

.page-about .stage .disclosure-body {
  padding: 0 4px 18px;
  max-width: 56ch;
  color: var(--stone);
  font-size: 14.5px;
  line-height: 1.78;
}

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

/* ---------- 团队 ---------- */
.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .role-card {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 12px;
  padding: 16px 6px;
  border-bottom: 1px solid var(--line-faint);
  transition: background var(--t-fast) var(--ease);
}

.page-about .role-card:hover {
  background: linear-gradient(90deg, rgba(200, 255, 61, 0.1), transparent 64%);
}

.page-about .role-index {
  grid-column: 1;
  grid-row: 1;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .role-name {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .role-duty {
  grid-column: 2;
  grid-row: 2;
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--stone);
}

.page-about .process-strip {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .process-item {
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--pitch);
  background: linear-gradient(90deg, rgba(12, 43, 33, 0.62), transparent 78%);
}

.page-about .process-kicker {
  display: block;
  margin-bottom: 5px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .process-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--stone);
}

/* ---------- 专题结构 ---------- */
.page-about .tier-body {
  display: grid;
  gap: clamp(22px, 4vw, 46px);
}

.page-about .tier-intro p {
  margin: 0 0 14px;
  font-size: clamp(14.5px, 1.6vw, 16px);
  line-height: 1.8;
  color: var(--stone);
  max-width: 58ch;
}

.page-about .tier-intro p:first-child {
  color: var(--mist);
}

.page-about .tier-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tier-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0 18px;
  border-top: 1px solid var(--line-faint);
}

.page-about .tier-row:last-child {
  border-bottom: 1px solid var(--line-faint);
}

.page-about .tier-key {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone-soft);
}

.page-about .tier-row h3 {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .tier-row p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--stone);
  max-width: 56ch;
}

/* ---------- 合作覆盖 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
  margin-bottom: 18px;
}

.page-about .coverage-figure {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 14px;
  background: var(--deep);
}

.page-about .coverage-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .coverage-figure:nth-child(2) .coverage-num,
.page-about .coverage-figure:nth-child(4) .coverage-num {
  color: var(--cyan);
}

.page-about .coverage-label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--stone);
}

.page-about .coverage-scale {
  height: 16px;
  border-top: 1px solid var(--line-faint);
  background-image: repeating-linear-gradient(
    to right,
    var(--line) 0,
    var(--line) 1px,
    transparent 1px,
    transparent calc(100% / 26)
  );
  background-repeat: repeat-x;
  background-position: top left;
  background-size: 100% 8px;
}

.page-about .coverage-caption {
  margin: 8px 0 clamp(20px, 3vw, 30px);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--stone-soft);
}

.page-about .coverage-text {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .coverage-text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 62ch;
}

/* ---------- 荣誉 ---------- */
.page-about .honors-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .honor-item {
  padding: 16px 16px 16px 20px;
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--lime);
  border-radius: var(--radius);
  background: linear-gradient(125deg, rgba(12, 43, 33, 0.88), rgba(7, 17, 13, 0.42));
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .honor-item:hover {
  border-color: var(--line);
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .honor-title {
  margin: 0 0 6px;
  font-size: 15.5px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--mist);
}

.page-about .honor-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 下一步 ---------- */
.page-about .about-chapter--last {
  padding-bottom: clamp(10px, 2vw, 20px);
}

.page-about .next-links {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 148px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  color: var(--mist);
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease),
    background var(--t-fast) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--lime);
  transform: translateY(-3px);
  outline: none;
}

.page-about .next-card--lead {
  background: linear-gradient(142deg, rgba(200, 255, 61, 0.15), rgba(12, 43, 33, 0.92) 62%);
  border-color: rgba(200, 255, 61, 0.34);
}

.page-about .next-kicker {
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .next-title {
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.4;
  font-weight: 800;
}

.page-about .next-desc {
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--stone);
}

.page-about .next-arrow {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border-top: 1px solid var(--line-faint);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .process-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .honors-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .next-card--lead {
    grid-column: 1 / -1;
    min-height: 168px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .hero-side {
    border-top: 0;
    border-left: 1px solid var(--line-soft);
    padding: 0 0 0 clamp(18px, 2.4vw, 30px);
  }

  .page-about .side-note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    height: 96px;
    max-height: 96px;
    letter-spacing: 0.3em;
    margin-bottom: 18px;
  }

  .page-about .chapter-body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-chapter--flip .chapter-aside {
    order: 2;
  }

  .page-about .about-chapter--flip .chapter-main {
    order: 1;
  }

  .page-about .tier-body {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .tier-row {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 4px 18px;
    align-items: baseline;
  }

  .page-about .tier-key {
    grid-column: 1;
    padding-top: 4px;
  }

  .page-about .tier-row h3,
  .page-about .tier-row p {
    grid-column: 2;
  }

  .page-about .next-links {
    grid-template-columns: minmax(0, 6fr) minmax(0, 3fr) minmax(0, 3fr);
    gap: 14px;
  }

  .page-about .next-card--lead {
    grid-column: auto;
    min-height: 200px;
  }

  .page-about .next-card:not(.next-card--lead) {
    min-height: 200px;
  }
}

@media (min-width: 1100px) {
  .page-about .chapter-head {
    grid-template-columns: auto minmax(0, 62ch);
  }

  .page-about .coverage-media {
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage .disclosure-icon,
  .page-about .stage .disclosure-trigger,
  .page-about .role-card,
  .page-about .honor-item,
  .page-about .next-card,
  .page-about .breadcrumb-list a {
    transition: none;
  }

  .page-about .honor-item:hover,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }

  .page-about .stage[data-open="true"] .disclosure-icon {
    transform: none;
    background: linear-gradient(var(--lime), var(--lime)) center / 12px 1px no-repeat;
  }
}
<<<END>>>