.page-about {
  --about-col-gap: 24px;
  --about-pad: 20px;
  background: var(--ink);
  color: var(--bone);
}

.page-about .container {
  max-width: min(1180px, 100% - var(--about-pad) * 2);
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .about-masthead {
  padding-top: calc(var(--bar-h) + 18px);
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-lit);
}

.page-about .about-crumb__here {
  color: var(--bone);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 30px 0 52px;
  background:
    radial-gradient(120% 70% at 88% -10%, rgba(98, 246, 216, 0.09), transparent 62%),
    radial-gradient(80% 60% at 0% 110%, rgba(27, 90, 58, 0.5), transparent 70%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, var(--grid-ghost) 1px, transparent 1px);
  background-size: 25% 100%;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 10.5vw, 96px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  margin: 26px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-hero__meta .data {
  font-family: var(--font-data);
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--bone);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  align-self: start;
  border-top: 1px solid var(--line-green);
  padding-top: 14px;
}

.page-about .about-index__caption {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-index ol {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index li {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  font-size: 14px;
  color: var(--bone);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  padding-left: 6px;
}

.page-about .about-index .data {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--line-green);
}

/* ---------- 区块通用 ---------- */
.page-about .about-block {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-head {
  max-width: 740px;
}

.page-about .about-head__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(27px, 6.2vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about p {
  margin: 0;
}

/* ---------- 开篇 ---------- */
.page-about .about-mission__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-mission__para {
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-mission__list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-mission__list li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-mission__list strong {
  font-weight: 600;
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-mission__list span {
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-mission__caption,
.page-about .about-method__caption,
.page-about .about-timeline__caption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-mission__figure img,
.page-about .about-method__figure img,
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 场景 ---------- */
.page-about .scene-list {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-green);
}

.page-about .scene-list__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--dur) var(--ease);
}

.page-about .scene-list__item:hover {
  background: rgba(27, 90, 58, 0.18);
}

.page-about .scene-list__num {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--line-green);
  padding-top: 3px;
}

.page-about .scene-list__body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 4.6vw, 24px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .scene-list__body p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .scene-list__tag {
  grid-column: 2;
  justify-self: start;
  align-self: start;
}

/* ---------- 方法 ---------- */
.page-about .about-method__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-method__figure {
  order: 2;
  margin: 0;
}

.page-about .about-method__body {
  order: 1;
}

.page-about .method-layers {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .method-layer {
  position: relative;
  padding: 22px 20px 22px 24px;
  background: var(--ink);
  transition: background var(--dur) var(--ease);
}

.page-about .method-layer::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line-green);
  transition: background var(--dur) var(--ease);
}

.page-about .method-layer:hover {
  background: var(--turf-deep);
}

.page-about .method-layer:hover::before {
  background: var(--orange);
}

.page-about .method-layer__idx {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .method-layer h3 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .method-layer p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .method-layer__note {
  font-family: var(--font-data);
  font-size: 12px !important;
  letter-spacing: 0.04em;
  color: var(--signal) !important;
}

.page-about .method-coverage {
  margin-top: 26px;
  padding: 18px 20px;
  border-left: 2px solid var(--cyan);
  background: rgba(27, 90, 58, 0.24);
}

.page-about .method-coverage__label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .method-coverage p:last-child {
  font-size: 15px;
  line-height: 1.78;
  color: var(--bone);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  position: relative;
  margin: 36px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-green), var(--line-soft));
}

.page-about .tl__node {
  position: relative;
  padding: 0 0 26px;
  outline: none;
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 7px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 1px solid var(--line-green);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl__node:hover::before,
.page-about .tl__node:focus-within::before,
.page-about .tl__node:focus::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-data);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--bone);
}

.page-about .tl__title {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .tl__sum {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .tl__more {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
  border-left: 1px solid var(--line-soft);
  padding-left: 12px;
}

.page-about .about-timeline__figure {
  margin: 34px 0 0;
}

.page-about .about-timeline__figure .media {
  border: 1px solid var(--line-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  margin-top: 32px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .team-card {
  padding: 22px 20px;
  background: var(--ink);
  outline: none;
  transition: background var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus {
  background: var(--turf-deep);
}

.page-about .team-card__num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--bone);
  transition: color var(--dur) var(--ease);
}

.page-about .team-card__num .data {
  font-family: var(--font-data);
  font-size: 40px;
  letter-spacing: -0.02em;
}

.page-about .team-card:hover .team-card__num,
.page-about .team-card:focus .team-card__num {
  color: var(--cyan);
}

.page-about .team-card h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .team-card p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-card__tag {
  display: inline-block;
  margin-top: 14px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:hover .team-card__tag,
.page-about .team-card:focus .team-card__tag {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .eco {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .eco__caption {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .eco__lede {
  margin-top: 10px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .eco__list {
  display: grid;
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .eco__list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: var(--turf-deep);
}

.page-about .eco__list .data {
  font-family: var(--font-data);
  font-size: 22px;
  color: var(--cyan);
}

.page-about .eco__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--bone);
}

/* ---------- 原则 ---------- */
.page-about .about-principles__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-principles__aside {
  max-width: 620px;
}

.page-about .about-principles__btn {
  margin-top: 22px;
}

.page-about .principle-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-green);
}

.page-about .principle {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .principle__num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .principle h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .principle p {
  grid-column: 2;
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .principle a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lit);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .principle a:hover,
.page-about .principle a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 4px;
  padding: 48px 0 64px;
  background:
    linear-gradient(115deg, rgba(27, 90, 58, 0.55) 0%, rgba(10, 36, 24, 0.95) 55%, var(--ink) 100%);
  border-top: 1px solid var(--line-green);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta__text h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 6.6vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-cta__text p {
  margin-top: 14px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-pad: 32px;
  }

  .page-about .about-hero {
    padding: 46px 0 64px;
  }

  .page-about .about-hero__meta {
    gap: 20px 40px;
  }

  .page-about .about-block {
    padding: 64px 0;
  }

  .page-about .scene-list__item {
    grid-template-columns: 56px minmax(0, 1fr) auto;
    align-items: start;
  }

  .page-about .scene-list__tag {
    grid-column: 3;
    grid-row: 1;
    margin-top: 4px;
  }

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

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

  .page-about .team-card--lead {
    grid-column: span 2;
  }

  .page-about .team-card--lead .team-card__num,
  .page-about .team-card--lead .team-card__num .data {
    font-size: 56px;
  }

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

  .page-about .eco__list li {
    grid-template-columns: 1fr;
    align-content: start;
    gap: 8px;
    padding: 18px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about {
    --about-pad: 40px;
    --about-col-gap: 32px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: var(--about-col-gap);
    align-items: start;
  }

  .page-about .about-hero__title {
    margin-left: -0.045em;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
    padding-left: 4px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: calc(var(--about-col-gap) * 2);
    align-items: start;
  }

  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1fr);
    gap: calc(var(--about-col-gap) * 2);
    align-items: start;
  }

  .page-about .about-method__figure {
    order: 1;
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .about-method__body {
    order: 2;
  }

  .page-about .about-principles__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    gap: calc(var(--about-col-gap) * 2);
    align-items: start;
  }

  .page-about .about-principles__aside {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-card--lead {
    grid-column: span 2;
    grid-row: span 1;
  }

  .page-about .tl {
    padding-left: 34px;
    margin-top: 44px;
  }

  .page-about .tl__node {
    padding-bottom: 30px;
  }

  .page-about .tl__node::before {
    left: -33px;
  }

  .page-about .about-timeline__figure {
    margin-top: 12px;
  }
}

/* 桌面悬停展开时间轴版本要点 */
@media (hover: hover) and (min-width: 1000px) {
  .page-about .tl__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 260ms var(--ease), opacity 200ms var(--ease), margin-top var(--dur) var(--ease);
  }

  .page-about .tl__node:hover .tl__more,
  .page-about .tl__node:focus .tl__more,
  .page-about .tl__node:focus-within .tl__more {
    max-height: 220px;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__more {
    max-height: none !important;
    opacity: 1 !important;
    margin-top: 8px !important;
  }

  .page-about * {
    transition-duration: 1ms !important;
  }
}
<<<END>>>