.page-about {
  --ab-block-gap: clamp(48px, 7vw, 104px);
  --ab-hair: var(--line-200);
  display: block;
  color: var(--text-000);
  font-family: var(--font-text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  left: -14%;
  width: 132%;
  height: 70%;
  background:
    linear-gradient(118deg,
      rgba(43, 255, 163, 0.18) 0%,
      rgba(43, 255, 163, 0.05) 34%,
      rgba(60, 140, 255, 0.12) 60%,
      rgba(5, 7, 10, 0) 84%);
  transform: skewY(-7deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 42, 51, 0.75) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 42, 51, 0.75) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,0.15) 62%, transparent 82%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,0.15) 62%, transparent 82%);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(24px, 3vw, 40px);
  align-items: end;
}

.page-about .hero-copy .display,
.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 250;
  font-size: clamp(36px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .hero-copy .lede {
  margin-top: 22px;
  max-width: 46ch;
  color: var(--text-400);
}

.page-about .hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 14px 20px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
}

.page-about .hero-metrics > div {
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .hero-metrics > div:first-child {
  border-top-color: var(--signal-500);
}

.page-about .hero-metrics .stat-value {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--text-000);
}

.page-about .hero-metrics .stat-value .unit {
  margin-left: 0.08em;
  font-size: 0.5em;
  color: var(--text-400);
}

.page-about .hero-metrics .stat-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-400);
}

.page-about .hero-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--ab-hair);
  background: var(--ink-100);
  overflow: hidden;
}

.page-about .hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(43, 255, 163, 0.14), rgba(5, 7, 10, 0) 46%, rgba(60, 140, 255, 0.16));
  pointer-events: none;
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1920 / 1000;
  object-fit: cover;
}

.page-about .media-cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--ab-hair);
  background: var(--ink-000);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-400);
  position: relative;
  z-index: 1;
}

.page-about .wave {
  display: block;
  width: 100%;
  height: clamp(46px, 6vw, 78px);
  margin-top: clamp(30px, 4.6vw, 60px);
  color: var(--signal-500);
  opacity: 0.5;
}

/* ---------- 通用区头补充 ---------- */
.page-about .head-note {
  max-width: 30ch;
}

/* ---------- 01 发展历程 ---------- */
.page-about .tl {
  list-style: none;
  margin: clamp(26px, 3.6vw, 46px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom,
    var(--signal-500) 0%,
    var(--line-200) 22%,
    var(--line-200) 74%,
    var(--data-500) 100%);
}

.page-about .tl-node {
  position: relative;
  padding-left: 34px;
}

.page-about .tl-node + .tl-node {
  margin-top: 10px;
}

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 19px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink-000);
  border: 1px solid var(--ab-hair);
  display: grid;
  place-items: center;
}

.page-about .tl-dot::after {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal-500);
}

.page-about .tl-node--screen .tl-dot::after,
.page-about .tl-node--data .tl-dot::after {
  background: var(--data-500);
}

.page-about .tl-node--now .tl-dot::after {
  background: var(--rollback-400);
}

.page-about .tl-item {
  border: 1px solid var(--ab-hair);
  background: var(--ink-100);
  border-radius: var(--r);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-item[open] {
  border-color: rgba(43, 255, 163, 0.45);
  background: var(--ink-200);
}

.page-about .tl-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-item summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-item summary::after {
  content: "";
  margin-left: auto;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--text-400);
  border-bottom: 1px solid var(--text-400);
  transform: rotate(45deg) translate(-3px, -3px);
  transition: transform var(--dur) var(--ease);
  align-self: center;
}

.page-about .tl-item[open] summary::after {
  transform: rotate(-135deg) translate(-2px, -2px);
  border-color: var(--signal-500);
}

.page-about .tl-item summary:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: -2px;
}

.page-about .tl-stage {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-400);
}

.page-about .tl-name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 400;
  color: var(--text-000);
}

.page-about .tl-body {
  padding: 14px 18px 20px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 62ch;
  color: var(--text-400);
  line-height: 1.75;
}

/* ---------- 02 数据来源 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(26px, 3.6vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .flow-step {
  position: relative;
  background: var(--ink-000);
  padding: 26px 20px 28px;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--ab-hair);
}

.page-about .flow-step--a::before { background: var(--data-500); }
.page-about .flow-step--b::before { background: var(--rollback-400); }
.page-about .flow-step--c::before { background: var(--signal-500); }
.page-about .flow-step--d::before { background: var(--warn-500); }

.page-about .flow-idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--text-400);
}

.page-about .flow-name {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.page-about .flow-step p {
  margin: 0;
  color: var(--text-400);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-figure {
  position: relative;
  margin: clamp(28px, 4vw, 48px) 0 0;
  border: 1px solid var(--ab-hair);
  background: var(--ink-100);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-figure--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--tall img {
  aspect-ratio: 12 / 7;
}

/* ---------- 03 团队 ---------- */
.page-about .team-tabs {
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .team-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .team-tabs .tab {
  appearance: none;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--text-400);
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.04em;
  padding: 12px 18px;
  cursor: pointer;
  border-radius: var(--r) var(--r) 0 0;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-tabs .tab:hover {
  color: var(--text-000);
}

.page-about .team-tabs .tab[aria-selected="true"] {
  color: var(--text-000);
  background: var(--ink-100);
  border-color: var(--ab-hair);
  box-shadow: inset 0 2px 0 var(--signal-500);
}

.page-about .team-tabs .tab:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: 2px;
}

.page-about .team-tabs .tabpanel {
  padding: 26px 0 0;
}

.page-about .team-tabs .tabpanel:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: 4px;
}

.page-about .tabpanel .h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-about .tabpanel > p {
  margin: 0;
  max-width: 62ch;
  color: var(--text-400);
  line-height: 1.75;
}

.page-about .facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-hair);
  border-top: 1px solid var(--ab-hair);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .facts li {
  background: var(--ink-000);
  padding: 13px 2px;
  display: flex;
  gap: 14px;
  align-items: baseline;
  color: var(--text-000);
  font-size: 15px;
  line-height: 1.65;
}

.page-about .facts .mono {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--signal-500);
}

/* ---------- 04 版本节奏 ---------- */
.page-about .release-lede {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 66ch;
  color: var(--text-400);
}

.page-about .relay {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .relay-item {
  background: var(--ink-100);
  padding: 20px 18px 22px;
}

.page-about .relay-name {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-000);
}

.page-about .relay-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-400);
}

/* ---------- 05 视觉母题 ---------- */
.page-about .visual-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 40px);
  margin-top: clamp(26px, 3.6vw, 44px);
  align-items: start;
}

.page-about .visual-copy p {
  margin: 0 0 16px;
  max-width: 58ch;
  color: var(--text-400);
  line-height: 1.8;
}

.page-about .visual-copy p:last-child {
  margin-bottom: 0;
}

.page-about .swatches {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(228px, 1fr));
}

.page-about .swatch {
  --sw: var(--line-200);
  border: 1px solid var(--ab-hair);
  background: var(--ink-100);
  border-radius: var(--r);
  padding: 18px 18px 20px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .swatch--signal { --sw: var(--signal-500); }
.page-about .swatch--data { --sw: var(--data-500); }
.page-about .swatch--warn { --sw: var(--warn-500); }
.page-about .swatch--roll { --sw: var(--rollback-400); }
.page-about .swatch--line { --sw: var(--line-200); }

.page-about .swatch:hover,
.page-about .swatch:focus-within {
  border-color: var(--sw);
  background: var(--ink-200);
  transform: translateY(-3px);
}

.page-about .swatch-bar {
  display: block;
  height: 4px;
  width: 100%;
  background: var(--sw);
  margin-bottom: 16px;
}

.page-about .swatch-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--text-000);
}

.page-about .swatch-name .mono {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-400);
}

.page-about .swatch p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-400);
}

/* ---------- 06 往下走 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .next-intro .lede {
  margin-top: 20px;
  max-width: 42ch;
  color: var(--text-400);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .next-links li {
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .next-links a {
  display: grid;
  grid-template-columns: 40px 1fr;
  grid-template-areas:
    "idx label"
    "idx desc";
  gap: 2px 14px;
  padding: 18px 4px;
  text-decoration: none;
  color: var(--text-000);
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  background: var(--ink-100);
  padding-left: 14px;
}

.page-about .next-links a:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: -2px;
}

.page-about .next-idx {
  grid-area: idx;
  align-self: center;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-500);
}

.page-about .next-label {
  grid-area: label;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.page-about .next-desc {
  grid-area: desc;
  font-size: 13.5px;
  color: var(--text-400);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .next-links a {
    grid-template-columns: 46px minmax(180px, 260px) 1fr;
    grid-template-areas: "idx label desc";
    align-items: center;
    gap: 0 16px;
  }

  .page-about .next-desc {
    text-align: right;
  }
}

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .visual-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .about-figure--tall {
    margin-top: 0;
  }

  .page-about .next-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-figure--wide {
    margin-top: clamp(38px, 5vw, 64px);
  }
}

@media (min-width: 1180px) {
  .page-about .relay {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 559px) {
  .page-about .hero-copy .display,
  .page-about .about-hero h1 {
    font-size: clamp(30px, 9.4vw, 42px);
  }

  .page-about .tl-node {
    padding-left: 28px;
  }

  .page-about .tl-item summary {
    padding: 14px 15px;
  }

  .page-about .tl-body {
    padding: 12px 15px 18px;
  }

  .page-about .team-tabs .tab {
    padding: 10px 13px;
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .swatch:hover,
  .page-about .swatch:focus-within,
  .page-about .next-links a:hover,
  .page-about .next-links a:focus-visible {
    transform: none;
  }
}
<<<END>>>