.page-about {
  --about-line: rgba(143, 163, 181, 0.22);
  --about-soft: rgba(244, 241, 234, 0.8);
  --about-dark-text: #33404D;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  margin: 0;
}

.page-about a {
  text-decoration: none;
}

.page-about :focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  background: var(--ink-deep);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 11px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-crumbs a {
  color: var(--slate);
}

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

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--blue);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 6vw, 68px) 0 clamp(38px, 7vw, 84px);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(36, 92, 138, 0.55), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-bottom: var(--border-w) solid var(--blue);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 0.4em 0 0.55em;
  font-size: clamp(2rem, 6.2vw, 3.8rem);
  line-height: 1.06;
  letter-spacing: 0.045em;
  color: var(--paper);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-stats li {
  border: 2px solid var(--blue-deep);
  border-left: 4px solid var(--jade);
  background: rgba(23, 59, 92, 0.5);
  padding: 12px 14px;
}

.page-about .about-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-stats .lbl {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  border: var(--border-w) solid var(--paper);
  box-shadow: 8px 8px 0 var(--blue);
  background: var(--blue-deep);
  overflow: hidden;
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-hero__frame figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  background: var(--ink);
  color: var(--clay);
  font-size: 12px;
  letter-spacing: 0.16em;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: var(--ink-deep);
  border-bottom: 2px solid var(--blue-deep);
}

.page-about .about-index ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 13px 0;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

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

.page-about .about-index .mono {
  color: var(--clay);
  font-size: 12px;
  letter-spacing: 0.18em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(40px, 7vw, 82px) 0;
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--black);
  border-top: var(--border-w) solid var(--ink-deep);
  border-bottom: var(--border-w) solid var(--ink-deep);
}

.page-about .about-section--blue {
  background: linear-gradient(158deg, var(--blue) 0%, var(--blue-deep) 100%);
  color: var(--paper);
  border-bottom: var(--border-w) solid var(--ink-deep);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 54px);
}

.page-about .about-rail {
  border-left: 4px solid var(--clay);
  padding-left: 16px;
}

.page-about .about-rail__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--clay);
}

.page-about .about-rail h2 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .about-rail p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-section--paper .about-rail h2 {
  color: var(--black);
}

.page-about .about-section--paper .about-rail p {
  color: var(--about-dark-text);
}

.page-about .about-lead {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-section--paper .about-lead {
  color: var(--about-dark-text);
}

.page-about .about-tail {
  margin: 20px 0 0;
  max-width: 62ch;
  padding-left: 14px;
  border-left: 3px solid var(--clay);
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-section--paper .about-tail {
  color: var(--about-dark-text);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 4px 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--jade) 0%, var(--blue) 62%, var(--blue-deep) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 28px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 14px;
  height: 14px;
  border: 3px solid var(--jade);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .timeline__item--now::before {
  border-color: var(--clay);
  background: var(--clay);
}

.page-about .timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--clay);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 图片块 ---------- */
.page-about .about-shot {
  margin: 28px 0 0;
  border: var(--border-w) solid var(--paper);
  box-shadow: 8px 8px 0 var(--ink-deep);
  background: var(--blue-deep);
  overflow: hidden;
}

.page-about .about-section--paper .about-shot {
  border-color: var(--ink-deep);
}

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

.page-about .about-shot figcaption {
  padding: 8px 12px;
  background: var(--ink);
  color: var(--jade-light);
  font-size: 12px;
  letter-spacing: 0.1em;
}

/* ---------- 团队筛选与抽屉 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}

.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 8px 14px;
  border: 2px solid var(--ink-deep);
  background: transparent;
  color: var(--ink-deep);
  cursor: pointer;
  transition: background-color 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--clay);
  color: var(--clay);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--ink-deep);
  border-color: var(--ink-deep);
  color: var(--paper);
}

.page-about .team-list {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  border: var(--border-w) solid var(--ink-deep);
  background: #FFFFFF;
  box-shadow: 4px 4px 0 var(--ink-deep);
}

.page-about .team-card__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  background: var(--blue-deep);
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-card__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .team-card[open] .team-card__head::after {
  content: "–";
  color: var(--clay);
}

.page-about .team-card__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--jade-light);
}

.page-about .team-card__name {
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.page-about .team-card__count {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .team-card__body {
  padding: 16px 18px 18px;
}

.page-about .team-card[open] .team-card__body {
  animation: about-drawer 220ms var(--ease);
}

@keyframes about-drawer {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .team-card__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dark-text);
}

.page-about .team-card__effect {
  margin-top: 10px !important;
  padding-left: 12px;
  border-left: 3px solid var(--clay);
  font-size: 14px !important;
  color: var(--blue-deep) !important;
}

/* ---------- 四环节 ---------- */
.page-about .steps {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .steps li {
  position: relative;
  border: 2px solid rgba(244, 241, 234, 0.34);
  border-left: 4px solid var(--cyan);
  background: rgba(8, 16, 27, 0.34);
  padding: 15px 18px 17px;
}

.page-about .steps .step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .steps h3 {
  margin: 6px 0 7px;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 协作伙伴 ---------- */
.page-about .partners {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .partner-card {
  border: 2px solid var(--blue-deep);
  border-top: 4px solid var(--jade);
  background: rgba(23, 59, 92, 0.42);
  padding: 16px 18px 18px;
}

.page-about .partner-card .tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 3px 9px;
  border-width: 2px;
  border-style: solid;
}

.page-about .partner-card__name {
  margin: 0 0 8px;
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 整理方法 ---------- */
.page-about .method-list {
  margin: 0;
  border-top: 2px solid var(--ink-deep);
}

.page-about .method-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 2px solid var(--ink-deep);
}

.page-about .method-item__term {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--blue-deep);
  border-left: 4px solid var(--clay);
  padding-left: 10px;
}

.page-about .method-item__desc {
  margin: 0;
  padding-left: 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-dark-text);
}

/* ---------- 尾段路径 ---------- */
.page-about .about-next {
  padding: clamp(40px, 7vw, 78px) 0;
  background: var(--ink);
  border-top: var(--border-w) solid var(--blue);
}

.page-about .about-next h2 {
  margin: 0 0 22px;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .next-card {
  display: block;
  padding: 18px 18px 20px;
  border: 2px solid var(--blue-deep);
  border-bottom: 4px solid var(--clay);
  background: rgba(23, 59, 92, 0.36);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .next-card:hover {
  border-color: var(--cyan);
  background: rgba(42, 157, 143, 0.16);
  transform: translateY(-3px);
}

.page-about .next-card__label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--jade-light);
}

.page-about .next-card__text {
  display: block;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .method-item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

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

  .page-about .about-rail {
    padding-right: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card[open] .team-card__body {
    animation: none;
  }

  .page-about .next-card {
    transition: none;
  }

  .page-about .next-card:hover {
    transform: none;
  }
}
<<<END>>>