.page-about {
  background: var(--paper);
  color: var(--slate);
  overflow-x: hidden;
}

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

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

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.2vw, 2.85rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0.55rem 0 1.1rem;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.005em;
}

.page-about p {
  line-height: 1.85;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-abyss);
  color: var(--paper);
  padding: 128px 0 64px;
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(46, 230, 214, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 230, 214, 0.1) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(130% 95% at 78% 6%, #000 0%, rgba(0, 0, 0, 0.35) 52%, transparent 78%);
  mask-image: radial-gradient(130% 95% at 78% 6%, #000 0%, rgba(0, 0, 0, 0.35) 52%, transparent 78%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 7.4vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: -0.022em;
  margin: 0.5rem 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin: 1.6rem 0 0;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(245, 248, 249, 0.82);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  padding: 0;
  background: rgba(46, 230, 214, 0.26);
  border: 1px solid rgba(46, 230, 214, 0.26);
}

.page-about .hero-stat {
  background: var(--ink-abyss);
  padding: 16px 18px 18px;
}

.page-about .hero-stat dt {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: rgba(245, 248, 249, 0.6);
}

.page-about .hero-stat dd {
  margin: 8px 0 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 起点与定位 ---------- */
.page-about .about-origin {
  background: var(--paper);
}

.page-about .about-origin__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-origin__text p {
  max-width: 62ch;
  margin: 0 0 1rem;
}

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

.page-about .about-origin__list li {
  position: relative;
  padding: 13px 0 13px 22px;
  border-bottom: 1px solid var(--grid);
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-about .about-origin__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.45em;
  width: 8px;
  height: 8px;
  background: var(--coral);
}

.page-about .about-origin__figure {
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  color: var(--paper);
}

.page-about .about-timeline h2 {
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-timeline__head {
  max-width: 68ch;
  margin-bottom: 40px;
}

.page-about .about-timeline__intro {
  margin: 0;
  color: rgba(245, 248, 249, 0.76);
  font-size: 0.98rem;
}

.page-about .about-timeline__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid rgba(195, 211, 220, 0.24);
}

.page-about .tl-rail {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .tl-rail::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(46, 230, 214, 0.32);
}

.page-about .tl-node {
  position: relative;
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 15px 14px 16px 36px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(195, 211, 220, 0.2);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 180ms var(--ease);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 22px;
  width: 8px;
  height: 8px;
  background: var(--coral);
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .tl-node:hover {
  background: rgba(46, 230, 214, 0.07);
}

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

.page-about .tl-node[aria-selected="true"] {
  background: rgba(46, 230, 214, 0.1);
}

.page-about .tl-node[aria-selected="true"]::before {
  background: var(--cyan);
  transform: scale(1.35);
}

.page-about .tl-node__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .tl-node__year {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .tl-node__ver {
  font-size: 0.69rem;
  letter-spacing: 0.08em;
  color: rgba(245, 248, 249, 0.48);
  transition: color 180ms var(--ease);
}

.page-about .tl-node:hover .tl-node__ver {
  color: var(--coral);
}

.page-about .tl-node__title {
  display: block;
  margin-top: 5px;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .tl-panels {
  min-width: 0;
}

.page-about .tl-panel {
  padding: 24px 2px 30px;
  border-bottom: 1px solid rgba(195, 211, 220, 0.2);
}

.page-about .tl-panel h3 {
  margin: 0 0 12px;
  font-size: clamp(1.22rem, 3.4vw, 1.6rem);
  color: var(--paper);
}

.page-about .tl-panel p {
  margin: 0 0 12px;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.9;
  color: rgba(245, 248, 249, 0.78);
}

.page-about .tl-panel p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__banner {
  margin: 0 0 44px;
}

.page-about .about-team__head {
  max-width: 66ch;
  margin-bottom: 32px;
}

.page-about .about-team__head p {
  margin: 0;
  max-width: 62ch;
}

.page-about .about-team__boards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid rgba(20, 35, 46, 0.22);
}

.page-about .team-board {
  padding: 24px 0 28px;
  border-bottom: 1px solid rgba(20, 35, 46, 0.22);
}

.page-about .team-board__num {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--coral);
}

.page-about .team-board__count {
  margin: 10px 0 4px;
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--deep-sea);
}

.page-about .team-board__role {
  margin: 0 0 14px;
  font-size: 1.14rem;
  line-height: 1.4;
  color: var(--slate);
}

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

.page-about .team-board__list li {
  position: relative;
  padding: 0 0 10px 16px;
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .team-board__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 6px;
  height: 1px;
  background: var(--deep-sea);
}

.page-about .about-team__flow {
  margin: 28px 0 0;
  max-width: 74ch;
  padding: 18px 0 0 18px;
  border-left: 2px solid var(--coral);
  font-size: 0.95rem;
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  color: var(--paper);
}

.page-about .about-network h2 {
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-network__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

.page-about .about-network__figure {
  margin: 0;
}

.page-about .about-network__text p {
  margin: 0 0 1rem;
  max-width: 62ch;
  font-size: 0.96rem;
  color: rgba(245, 248, 249, 0.8);
}

.page-about .net-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0;
  padding: 0;
  background: rgba(46, 230, 214, 0.28);
  border: 1px solid rgba(46, 230, 214, 0.28);
}

.page-about .net-stats li {
  background: var(--deep-sea);
  padding: 16px 12px 18px;
}

.page-about .net-stats__num {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .net-stats__plus {
  font-size: 0.7em;
}

.page-about .net-stats__label {
  display: block;
  margin-top: 10px;
  font-size: 0.76rem;
  line-height: 1.5;
  color: rgba(245, 248, 249, 0.72);
}

.page-about .about-network__note {
  padding-left: 16px;
  border-left: 1px solid rgba(46, 230, 214, 0.45);
  font-size: 0.92rem !important;
}

/* ---------- 内容组织方法 ---------- */
.page-about .about-method {
  background: var(--paper);
}

.page-about .about-method__head {
  max-width: 66ch;
  margin-bottom: 36px;
}

.page-about .about-method__intro {
  margin: 0;
  max-width: 60ch;
  font-size: 0.98rem;
}

.page-about .about-method__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--grid);
}

.page-about .method-col {
  padding: 24px 0 28px;
  border-bottom: 1px solid var(--grid);
}

.page-about .method-col__num {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--ocean-mid);
}

.page-about .method-col h3 {
  margin: 0 0 10px;
  font-size: 1.24rem;
  color: var(--deep-sea);
}

.page-about .method-col p {
  margin: 0 0 12px;
  max-width: 56ch;
  font-size: 0.94rem;
}

.page-about .method-col__list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.page-about .method-col__list li {
  position: relative;
  padding: 9px 0 9px 18px;
  border-bottom: 1px dashed rgba(195, 211, 220, 0.9);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .method-col__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.5em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  opacity: 0.85;
}

.page-about .method-col__list strong {
  color: var(--deep-sea);
}

.page-about .method-col__foot {
  margin: 0;
  font-size: 0.88rem;
  color: rgba(20, 35, 46, 0.72);
}

.page-about .about-method__cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 30px;
  padding: 20px 20px 22px;
  background: var(--coral-tint);
  border-left: 3px solid var(--coral);
}

.page-about .about-method__cadence-label {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: #8a3a22;
}

.page-about .about-method__cadence p {
  margin: 0;
  max-width: 74ch;
  font-size: 0.93rem;
  color: var(--slate);
}

/* ---------- 公开信息 ---------- */
.page-about .about-records {
  background: var(--paper);
}

.page-about .about-records__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .about-records__text p {
  margin: 0 0 1rem;
  max-width: 56ch;
  font-size: 0.95rem;
}

.page-about .about-records__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-records__list {
  margin: 0;
  border-top: 1px solid var(--slate);
}

.page-about .records-row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 4px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .records-row dt {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--ocean-mid);
}

.page-about .records-row dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  word-break: break-word;
}

.page-about .records-row dd a {
  color: var(--deep-sea);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
}

.page-about .records-row dd a:hover {
  border-bottom-color: var(--coral);
}

.page-about .records-row--note dd {
  color: rgba(20, 35, 46, 0.78);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-method__cadence {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 168px 0 84px;
  }

  .page-about .about-origin__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: 288px minmax(0, 1fr);
  }

  .page-about .tl-rail {
    border-right: 1px solid rgba(195, 211, 220, 0.24);
  }

  .page-about .tl-node {
    padding: 18px 18px 19px 36px;
  }

  .page-about .tl-panel {
    padding: 34px 0 40px 44px;
    border-bottom: 1px solid rgba(195, 211, 220, 0.2);
  }

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

  .page-about .team-board {
    padding: 26px 28px 30px;
    border-right: 1px solid rgba(20, 35, 46, 0.22);
    border-bottom: 0;
  }

  .page-about .team-board:first-child {
    padding-left: 0;
  }

  .page-about .team-board:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .about-network__inner {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 56px;
  }

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

  .page-about .method-col {
    padding: 28px 40px 32px 0;
    border-bottom: 0;
    border-right: 1px solid var(--grid);
  }

  .page-about .method-col:last-child {
    padding-right: 0;
    padding-left: 40px;
    border-right: 0;
  }

  .page-about .about-records__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 64px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-node::before,
  .page-about .tl-node__ver {
    transition: opacity 120ms linear;
  }

  .page-about .tl-node[aria-selected="true"]::before {
    transform: none;
  }
}
<<<END>>>