.page-about {
  --about-line-w: 2px;
  --about-node-size: 13px;
  --about-gap: clamp(18px, 3vw, 32px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .eyebrow--onblue {
  color: var(--yellow);
}

.page-about .eyebrow--onblue::before {
  background: var(--yellow);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 5vw, 56px) clamp(24px, 4vw, 46px);
  background:
    radial-gradient(120% 100% at 100% 0%, var(--orange-mist) 0%, rgba(255, 231, 223, 0) 62%),
    radial-gradient(90% 80% at 0% 100%, var(--yellow-mist) 0%, rgba(255, 243, 196, 0) 58%),
    var(--paper);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero-main h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-hero-lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .board-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  background: #fff;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .board-cell:hover {
  transform: translateY(-2px);
  background: var(--mist);
}

.page-about .board-cell--signal {
  background: var(--signal);
  color: var(--ink);
}

.page-about .board-cell--signal:hover {
  background: var(--signal);
}

.page-about .board-cell--blue {
  background: var(--blue);
  color: #fff;
}

.page-about .board-cell--blue:hover {
  background: var(--blue-mid);
}

.page-about .board-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .board-label {
  font-size: 13px;
  line-height: 1.5;
  opacity: 0.86;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-block: 14px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.55);
}

/* ---------- 通用栏头 ---------- */
.page-about .about-sec-head {
  max-width: 46em;
  margin-bottom: clamp(22px, 3.2vw, 36px);
}

.page-about .about-sec-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-sec-sub {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 品牌坐标 ---------- */
.page-about .coord-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  counter-reset: coord;
}

.page-about .coord-item {
  position: relative;
  padding: 26px 20px 28px;
  background: #fff;
  border-top: 4px solid var(--signal);
}

.page-about .coord-item:nth-child(2) {
  border-top-color: var(--blue-mid);
}

.page-about .coord-item:nth-child(3) {
  border-top-color: var(--yellow);
}

.page-about .coord-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--slate);
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
}

.page-about .coord-item h3 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.01em;
}

.page-about .coord-item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 三条服务线 ---------- */
.page-about .lines-grid {
  display: grid;
  gap: 16px;
  align-items: start;
}

.page-about .line-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px 20px 22px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .line-card:hover {
  transform: translateY(-2px);
  border-color: var(--blue-mid);
}

.page-about .line-card--entry {
  background: var(--orange-mist);
  border-color: rgba(255, 90, 31, 0.35);
}

.page-about .line-card--tool {
  background: var(--mist);
  border-color: rgba(11, 59, 111, 0.22);
}

.page-about .line-card--doc {
  background: var(--yellow-mist);
  border-color: rgba(255, 210, 63, 0.6);
}

.page-about .line-card summary {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .line-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--signal);
  letter-spacing: 0.08em;
}

.page-about .line-name {
  flex: 1;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  letter-spacing: -0.01em;
}

.page-about .line-toggle {
  position: relative;
  width: 18px;
  height: 18px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  flex: none;
}

.page-about .line-toggle::before,
.page-about .line-toggle::after {
  content: "";
  position: absolute;
  inset: 50% 4px auto;
  height: 1.5px;
  background: var(--ink);
  transform: translateY(-50%);
  transition: transform var(--dur) var(--ease);
}

.page-about .line-toggle::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-about .line-card[open] .line-toggle::after {
  transform: translateY(-50%) rotate(0deg);
}

.page-about .line-card > p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .line-card .link-more {
  display: inline-flex;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--blue);
}

/* ---------- 发展折线 ---------- */
.page-about .path-figure {
  margin: 0 0 clamp(24px, 3.4vw, 40px);
}

.page-about .path-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 8px;
}

.page-about .path-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: var(--about-line-w);
  background: linear-gradient(180deg, var(--signal) 0%, var(--blue-mid) 55%, var(--blue) 100%);
  border-radius: 2px;
}

.page-about .path-item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 14px 0 20px;
}

.page-about .path-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 20px;
  width: var(--about-node-size);
  height: var(--about-node-size);
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px var(--orange-mist);
  transition: transform var(--dur) var(--ease);
}

.page-about .path-item:nth-child(2)::before {
  background: var(--yellow);
  box-shadow: 0 0 0 4px var(--yellow-mist);
}

.page-about .path-item--now::before {
  background: var(--blue);
  box-shadow: 0 0 0 4px var(--mist);
}

.page-about .path-item:hover::before {
  transform: scale(1.18);
}

.page-about .path-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .path-body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.page-about .path-body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 42em;
}

/* ---------- 会员结构 ---------- */
.page-about .about-member-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .member-copy h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .member-copy > p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate);
}

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

.page-about .scene-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 16px 16px 18px;
  background: #fff;
}

.page-about .scene-tag {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--signal);
  line-height: 1.6;
}

.page-about .scene-list h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
}

.page-about .scene-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .member-figure {
  background: var(--blue);
  color: #fff;
  border-radius: var(--r-lg);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .pip-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
}

.page-about .pip {
  position: relative;
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .pip--hot {
  background: var(--signal);
  cursor: help;
}

.page-about .pip--hot:hover {
  transform: scale(1.14);
}

.page-about .pip-tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translate(-50%, 4px);
  padding: 4px 9px;
  font-size: 12px;
  font-style: normal;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--ink);
  background: var(--yellow);
  border-radius: var(--r-xs);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  z-index: 2;
}

.page-about .pip--hot:hover .pip-tip,
.page-about .pip--hot:focus-within .pip-tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .pip-caption {
  margin: 16px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .member-note {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--on-blue-line);
}

.page-about .member-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.9);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--blue);
  color: #fff;
}

.page-about .about-team-grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
  align-items: center;
}

.page-about .team-copy h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .team-copy > p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.86);
  max-width: 40em;
}

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

.page-about .team-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.92);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--on-blue-line);
}

.page-about .team-list .mono {
  flex: none;
  min-width: 46px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.page-about .team-figure {
  margin: 0;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--r-lg);
  overflow: hidden;
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  align-items: start;
}

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

.page-about .eco-nodes li {
  position: relative;
  padding: 20px 20px 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 5px solid var(--signal);
  border-radius: var(--r-md);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .eco-nodes li:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(11, 59, 111, 0.1);
}

.page-about .eco-nodes .eco-node--line {
  border-left-color: var(--blue-mid);
}

.page-about .eco-nodes li:last-child {
  border-left-color: var(--yellow);
}

.page-about .eco-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--blue);
}

.page-about .eco-nodes h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
}

.page-about .eco-nodes p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .eco-figure {
  margin: 0;
  padding: 14px 14px 18px;
  background: var(--mist);
  border-radius: var(--r-lg);
  border: 1px solid rgba(11, 59, 111, 0.14);
}

.page-about .eco-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-sm);
  object-fit: cover;
}

.page-about .eco-figure figcaption {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--blue);
}

.page-about .eco-figure figcaption .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--slate);
  margin-bottom: 4px;
}

/* ---------- 收尾 ---------- */
.page-about .about-start {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(22px, 3.4vw, 34px);
  display: grid;
  gap: 20px;
  border-radius: var(--r-lg);
  background:
    linear-gradient(120deg, var(--yellow-mist) 0%, var(--orange-mist) 100%);
  border: 1px solid rgba(255, 90, 31, 0.28);
}

.page-about .start-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .start-copy p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 40em;
}

.page-about .start-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .coord-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .line-card--tool {
    margin-top: 26px;
  }

  .page-about .line-card--doc {
    margin-top: 12px;
  }

  .page-about .path-item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 4px 24px;
    padding: 16px 0 22px;
  }

  .page-about .path-year {
    padding-top: 3px;
    text-align: right;
  }

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

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

  .page-about .start-links {
    justify-content: flex-end;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-member-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .pip-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero-board {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .pip-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 6px;
  }

  .page-about .start-links .btn {
    width: 100%;
    text-align: center;
  }
}
<<<END>>>