.page-about {
  --about-pad: clamp(20px, 3vw, 34px);
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
  margin-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(34px, 6.2vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 40ch;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .hero-stats {
  margin-top: clamp(24px, 3vw, 36px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero-stat {
  background: var(--card-bg);
  padding: 16px 18px 18px;
  min-width: 0;
}

.page-about .hero-stat-v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .hero-plus {
  font-size: 0.6em;
  vertical-align: super;
  margin-left: 2px;
}

.page-about .hero-stat-k {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.page-about .hero-visual {
  margin: 0;
  min-width: 0;
}

.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-1);
}

.page-about .hero-visual .figure-note,
.page-about .team-figure .figure-note,
.page-about .partners-figure .figure-note {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--dim);
}

/* ---------- 起点与定位 ---------- */

.page-about .pos-facts {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  align-self: start;
}

.page-about .pos-fact {
  background: var(--card-bg);
  padding: 14px 18px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .pos-fact-k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dim);
  text-transform: uppercase;
  flex: 0 0 auto;
}

.page-about .pos-fact-v {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--text);
  text-align: right;
  min-width: 0;
  word-break: break-word;
}

.page-about .pos-fact-v--sm {
  font-size: 12px;
  color: var(--dim);
}

.page-about .pos-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  max-width: 60ch;
}

.page-about .pos-body p:last-child {
  margin-bottom: 0;
}

.page-about .pos-meta {
  color: var(--dim) !important;
  font-size: 13px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline-list {
  position: relative;
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0 0 0 28px;
  display: grid;
  gap: clamp(64px, 9vw, 96px);
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 48%, var(--line) 100%);
  opacity: 0.55;
}

.page-about .timeline-item {
  position: relative;
  min-width: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink-0);
  box-shadow: 0 0 0 4px var(--glow-2);
}

.page-about .timeline-mark {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .timeline-ver {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dim);
  text-transform: uppercase;
}

.page-about .timeline-item h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.35;
  font-weight: 600;
  color: var(--text);
}

.page-about .timeline-item > p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--dim);
  max-width: 62ch;
}

/* 旁注卡片 */

.page-about .aside-card {
  margin-top: 20px;
  max-width: 520px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--card-bg);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .aside-card summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

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

.page-about .aside-card summary::after {
  content: "+";
  margin-left: auto;
  font-size: 15px;
  line-height: 1;
}

.page-about .aside-card[open] summary::after {
  content: "−";
}

.page-about .aside-body {
  margin: 0;
  padding: 0 16px 14px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--dim);
}

/* ---------- 团队 ---------- */

.page-about .team-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-1);
}

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .team-intro p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  max-width: 44ch;
}

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

.page-about .team-group {
  background: var(--card-bg);
  padding: clamp(18px, 2.6vw, 26px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 8px;
  align-items: baseline;
}

.page-about .team-group-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--violet);
  grid-row: 1;
}

.page-about .team-group h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  grid-row: 1;
}

.page-about .team-group p {
  margin: 0;
  grid-column: 1 / -1;
  font-size: 15px;
  line-height: 1.75;
  color: var(--dim);
}

/* ---------- 流程 ---------- */

.page-about .flow-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 3.4vw, 32px);
}

.page-about .flow-list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: repeating-linear-gradient(180deg, var(--line) 0 6px, transparent 6px 13px);
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about .flow-num {
  position: relative;
  z-index: 1;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 1px solid var(--cyan);
  background: var(--ink-1);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .flow-body h3 {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

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

.page-about .flow-aside {
  margin-top: clamp(28px, 4vw, 0px);
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--card-bg);
  align-self: start;
}

.page-about .flow-aside-k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--violet);
}

.page-about .flow-aside > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--dim);
}

.page-about .flow-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease);
}

.page-about .flow-link:hover,
.page-about .flow-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 合作 ---------- */

.page-about .partners-figure {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
}

.page-about .partners-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-1);
}

.page-about .partner-band {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(186px, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  max-width: 100%;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-about .partner-chip {
  min-width: 0;
  padding: 16px 18px 18px;
  border-right: 1px solid var(--line);
  scroll-snap-align: start;
  transition: background 240ms var(--ease);
  outline-offset: -2px;
}

.page-about .partner-chip:last-child {
  border-right: 0;
}

.page-about .partner-chip:hover,
.page-about .partner-chip:focus-visible {
  background: var(--card-bg);
}

.page-about .p-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dim);
  margin-bottom: 8px;
}

.page-about .p-name {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.page-about .p-detail {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--dim);
  transition: color 220ms var(--ease), opacity 220ms var(--ease);
}

@media (hover: hover) {
  .page-about .p-detail {
    opacity: 0;
  }

  .page-about .partner-chip:hover .p-detail,
  .page-about .partner-chip:focus-visible .p-detail {
    opacity: 1;
    color: var(--cyan);
  }
}

.page-about .partners-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
  max-width: 68ch;
}

.page-about .partners-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 200ms var(--ease);
}

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

/* ---------- 我们怎么做 ---------- */

.page-about .value-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .value-item {
  background: var(--card-bg);
  padding: var(--about-pad);
}

.page-about .value-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
  margin-bottom: 12px;
}

.page-about .value-item h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 600;
  color: var(--text);
}

.page-about .value-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--dim);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  margin-top: clamp(56px, 9vw, 104px);
  padding: clamp(28px, 5vw, 56px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 12% 0%, var(--glow-1), transparent 62%),
    radial-gradient(90% 120% at 92% 100%, var(--glow-2), transparent 58%),
    var(--card-bg);
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cta > p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--dim);
  max-width: 52ch;
}

.page-about .about-cta-actions {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端 ---------- */

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-hero .lede {
    max-width: 44ch;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

  .page-about .flow-aside {
    margin-top: 0;
  }

  .page-about .timeline-list {
    padding-left: 40px;
  }

  .page-about .timeline-item::before {
    left: -40px;
  }

  .page-about .timeline-list::before {
    left: 5px;
  }
}
<<<END>>>