.page-about {
  --about-diag: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
  color: var(--text);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(92px, 13vw, 124px);
}
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}
.page-about .about-crumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-crumb li + li::before {
  content: "/";
  color: var(--text-faint);
}
.page-about .about-crumb a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--lime-400);
  border-bottom-color: var(--line-lime);
}
.page-about .about-crumb [aria-current="page"] {
  color: var(--gold-500);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
  padding-top: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(52px, 8vw, 92px);
}
.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 6vw, 84px);
  line-height: 0.96;
  letter-spacing: -0.02em;
}
.page-about .about-lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--text-dim);
}
.page-about .about-hero-aside {
  border-left: 2px solid var(--line-lime);
  padding-left: 18px;
}
.page-about .about-hero-aside p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}
.page-about .about-note-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime-400);
  text-transform: uppercase;
}
.page-about .about-inline-link {
  display: inline-block;
  font-size: 14px;
  color: var(--lime-400);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease);
}
.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--lime-200);
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: 56px;
  }
}

/* 通用章节头 */
.page-about .about-sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 44px);
}
.page-about .about-sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 3.6vw, 48px);
  line-height: 1.04;
  letter-spacing: -0.01em;
}
.page-about .about-sec-head p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}
@media (min-width: 880px) {
  .page-about .about-sec-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 32ch);
    align-items: end;
    gap: 36px;
  }
}

/* 品牌升级时间线 */
.page-about .about-timeline {
  padding: clamp(40px, 6vw, 72px) 0 clamp(56px, 8vw, 96px);
}
.page-about .tl-track {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
@media (min-width: 820px) {
  .page-about .tl-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}
.page-about .tl-node {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .tl-node::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, var(--lime-400), rgba(184, 255, 74, 0) 72%);
  opacity: 0.6;
}
.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-lime);
  background: var(--ink-700);
}
.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold-500);
  margin-bottom: 12px;
}
.page-about .tl-node h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.page-about .tl-node p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-dim);
}
.page-about .tl-more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-faint);
  transition: max-height 260ms var(--ease), opacity 200ms var(--ease), margin-top 260ms var(--ease);
}
.page-about .tl-node:hover .tl-more,
.page-about .tl-node:focus-within .tl-more {
  max-height: 12em;
  opacity: 1;
  margin-top: 12px;
}
.page-about .tl-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--lime-400);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
  padding-bottom: 2px;
  min-height: 24px;
}
.page-about .tl-link:hover,
.page-about .tl-link:focus-visible {
  color: var(--lime-200);
}

/* 宽幅图 */
.page-about .about-wide-figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
}
.page-about .about-wide-figure img {
  display: block;
  width: 100%;
  height: clamp(210px, 32vw, 440px);
  object-fit: cover;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
}
.page-about .about-wide-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-faint);
}

/* 四类内容：浅色区块 */
.page-about .about-sys {
  --text: var(--ink-950);
  --text-dim: rgba(8, 21, 18, 0.68);
  --text-faint: rgba(8, 21, 18, 0.5);
  --line: rgba(8, 21, 18, 0.16);
  --line-lime: rgba(27, 58, 44, 0.43);
  position: relative;
  margin: clamp(24px, 4vw, 48px) 0;
  padding: clamp(64px, 9vw, 112px) 0;
  background: var(--paper-050);
  color: var(--ink-950);
  clip-path: var(--about-diag);
}
.page-about .about-sys .about-sec-head h2 {
  color: var(--ink-950);
}
.page-about .sys-list {
  display: grid;
  gap: 0;
}
.page-about .sys-row {
  display: grid;
  gap: 12px;
  padding: clamp(22px, 3vw, 30px) 0;
  border-top: 1px solid var(--line);
}
.page-about .sys-row:last-child {
  border-bottom: 1px solid var(--line);
}
@media (min-width: 860px) {
  .page-about .sys-row {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 60px);
    align-items: start;
  }
}
.page-about .sys-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold-700);
  margin-bottom: 8px;
}
.page-about .sys-tag h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.1;
  color: var(--ink-950);
}
.page-about .sys-body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 64ch;
}
.page-about .sys-link {
  display: inline-block;
  font-size: 14px;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1.5px solid var(--gold-500);
  padding-bottom: 2px;
  min-height: 24px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .sys-link:hover,
.page-about .sys-link:focus-visible {
  color: var(--gold-700);
  border-bottom-color: var(--ink-700);
}

/* 数据流向 */
.page-about .about-flow-sec {
  padding: clamp(56px, 8vw, 100px) 0;
  background-image:
    radial-gradient(120% 90% at 12% 0%, rgba(111, 217, 176, 0.1), transparent 62%),
    radial-gradient(90% 70% at 100% 100%, rgba(184, 255, 74, 0.08), transparent 66%);
}
.page-about .about-flow {
  margin: 0;
}
.page-about .flow-svg {
  display: none;
  width: 100%;
  height: auto;
  overflow: visible;
}
.page-about .flow-svg .node-box {
  fill: var(--ink-800);
  stroke: rgba(233, 237, 230, 0.18);
  stroke-width: 1.5;
}
.page-about .flow-svg .node-box--accent {
  fill: rgba(184, 255, 74, 0.12);
  stroke: rgba(184, 255, 74, 0.5);
}
.page-about .flow-svg .t-title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 24px;
  fill: var(--mist-100);
}
.page-about .flow-svg .t-sub {
  font-family: var(--font-body);
  font-size: 16px;
  fill: rgba(233, 237, 230, 0.62);
}
.page-about .flow-svg .t-mono {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  fill: var(--gold-500);
}
.page-about .flow-svg .flow-line {
  stroke: rgba(184, 255, 74, 0.65);
  stroke-width: 2;
  stroke-dasharray: 7 6;
  fill: none;
}
.page-about .flow-svg .flow-scale {
  stroke: rgba(233, 237, 230, 0.18);
  stroke-width: 1;
}
.page-about .flow-svg .flow-node:hover .node-box {
  stroke: var(--lime-400);
  stroke-width: 2.5;
}
.page-about .flow-steps {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .flow-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 18px 16px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}
.page-about .flow-steps .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold-500);
  letter-spacing: 0.1em;
}
.page-about .flow-steps strong {
  display: block;
  font-size: 16px;
  margin-bottom: 6px;
}
.page-about .flow-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about .about-flow figcaption {
  margin-top: 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-faint);
}
@media (min-width: 780px) {
  .page-about .flow-svg {
    display: block;
  }
  .page-about .flow-steps {
    display: none;
  }
}

/* 团队 */
.page-about .about-team {
  padding: clamp(48px, 7vw, 92px) 0;
}
.page-about .about-team-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}
@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(36px, 5vw, 68px);
    align-items: start;
  }
}
.page-about .team-figure {
  margin: 0;
}
.page-about .team-figure img {
  display: block;
  width: 100%;
  height: clamp(260px, 46vw, 520px);
  object-fit: cover;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
}
.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .team-roles li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  align-items: start;
}
.page-about .role-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}
.page-about .team-roles h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.page-about .team-roles p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--text-dim);
  max-width: 62ch;
}

/* 覆盖与节奏 */
.page-about .about-scale {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 9vw, 112px) 0;
  background: var(--ink-900);
  isolation: isolate;
}
.page-about .scale-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.72) contrast(1.06);
  z-index: -2;
}
.page-about .about-scale::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(8, 21, 18, 0.95) 28%, rgba(8, 21, 18, 0.62) 100%);
  z-index: -1;
}
.page-about .about-scale h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  max-width: 20ch;
}
.page-about .scale-band {
  display: grid;
  gap: 16px;
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
}
.page-about .scale-item {
  padding-top: 16px;
  border-top: 1px solid rgba(233, 237, 230, 0.18);
}
.page-about .scale-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 50px);
  line-height: 1;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}
.page-about .scale-label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
}
@media (min-width: 640px) {
  .page-about .scale-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 28px;
  }
}
@media (min-width: 1000px) {
  .page-about .scale-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .scale-item {
    border-top: 0;
    border-left: 1px solid rgba(233, 237, 230, 0.18);
    padding: 6px 22px 6px 24px;
  }
  .page-about .scale-item:first-child {
    border-left: 0;
    padding-left: 0;
  }
}
.page-about .scale-note {
  margin: clamp(26px, 4vw, 38px) 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* 路线图 */
.page-about .about-road {
  padding: clamp(56px, 8vw, 104px) 0;
}
.page-about .road-tree {
  position: relative;
  display: grid;
  gap: 12px;
  padding-left: 26px;
}
.page-about .road-tree::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime-400), rgba(184, 255, 74, 0.06));
}
@media (min-width: 860px) {
  .page-about .road-tree {
    padding-left: 40px;
  }
  .page-about .road-tree::before {
    left: 14px;
  }
}
.page-about .road-node {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .road-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 4px rgba(184, 255, 74, 0.16);
}
@media (min-width: 860px) {
  .page-about .road-node::before {
    left: -32px;
  }
}
.page-about .road-node:hover,
.page-about .road-node[open] {
  border-color: var(--line-lime);
}
.page-about .road-node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  padding: 16px 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 20px);
  letter-spacing: -0.01em;
  color: var(--mist-100);
}
.page-about .road-node summary::-webkit-details-marker {
  display: none;
}
.page-about .road-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--lime-400);
}
.page-about .road-node[open] summary::after {
  content: "–";
}
.page-about .road-node summary:hover {
  color: var(--lime-200);
}
.page-about .road-node summary:focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}
.page-about .road-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-500);
}
.page-about .road-node p {
  margin: 0;
  padding: 0 20px 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 66ch;
}

/* 收尾 */
.page-about .about-end {
  padding: 0 0 clamp(64px, 9vw, 112px);
}
.page-about .about-end-inner {
  display: grid;
  gap: 18px;
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(184, 255, 74, 0.12), transparent 60%),
    linear-gradient(120deg, var(--ink-800), var(--ink-900));
}
.page-about .about-end-inner h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.06;
  letter-spacing: -0.01em;
}
.page-about .about-end-inner p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-dim);
}
.page-about .about-end-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-more,
  .page-about .road-node,
  .page-about .sys-link,
  .page-about .about-inline-link,
  .page-about .about-crumb a {
    transition: none;
  }
  .page-about .tl-node:hover,
  .page-about .tl-node:focus-within {
    transform: none;
  }
}
<<<END>>>