.page-about {
  --about-rail-w: 148px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-sec-gap: clamp(56px, 9vw, 108px);
  --about-line: 3px;
  background: var(--abyss-900);
  color: var(--chalk-050);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 5vw, 64px) 0 clamp(48px, 7vw, 88px);
  background:
    radial-gradient(120% 86% at 84% 4%, rgba(33, 230, 214, 0.16), transparent 58%),
    radial-gradient(90% 70% at 6% 100%, rgba(255, 122, 41, 0.12), transparent 62%),
    linear-gradient(180deg, var(--abyss-950) 0%, var(--abyss-900) 82%);
  border-bottom: var(--about-line) solid var(--hairline-500);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(28px, 4vw, 48px);
  font-size: 13px;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
  }
}

.page-about .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-narrow);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--pulse-cyan);
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.012em;
  max-width: 20em;
}

.page-about .lede {
  margin: 0 0 30px;
  max-width: 42em;
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--mist-400);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px clamp(14px, 2.4vw, 26px);
}

@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .hero-stats .stat {
  padding-top: 12px;
  border-top: var(--about-line) solid var(--hairline-500);
}

.page-about .hero-stats .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--chalk-050);
}

.page-about .hero-stats .stat-value .unit {
  margin-left: 5px;
  font-family: var(--font-sans);
  font-size: 0.38em;
  font-weight: 400;
  color: var(--mist-400);
  letter-spacing: 0.02em;
}

.page-about .hero-stats .stat-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist-400);
}

.page-about .hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about .hero-gauge {
  width: 100%;
  max-width: 330px;
  height: auto;
  overflow: visible;
}

.page-about .gauge-axis,
.page-about .gauge-ticks line {
  stroke: var(--hairline-500);
  stroke-width: 3;
  stroke-linecap: square;
}

.page-about .gauge-ticks line.is-on {
  stroke: var(--pulse-cyan);
}

.page-about .gauge-trail {
  fill: none;
  stroke: url(#aboutGaugeTrail);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 7 11;
  animation: aboutDash 9s linear infinite;
}

.page-about .gauge-ring {
  fill: none;
  stroke: var(--mint-live);
  stroke-width: 2;
  opacity: 0.75;
  animation: aboutPulseRing 2.4s ease-in-out infinite;
}

.page-about .gauge-node {
  fill: var(--flare-orange);
}

@keyframes aboutDash {
  to { stroke-dashoffset: -180; }
}

@keyframes aboutPulseRing {
  0%, 100% { opacity: 0.25; }
  50% { opacity: 0.9; }
}

/* ---------- 主布局与锚点 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: clamp(36px, 5vw, 64px) clamp(48px, 7vw, 96px);
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

.page-about .anchor-rail {
  display: none;
}

@media (min-width: 1080px) {
  .page-about .anchor-rail {
    display: flex;
    flex-direction: column;
    gap: 0;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + var(--ticker-h) + 20px);
  }
}

.page-about .rail-link {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 6px 8px 6px 14px;
  border-left: var(--about-line) solid var(--hairline-500);
  font-size: 14px;
  color: var(--mist-400);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .rail-link::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--hairline-500);
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--chalk-050);
}

.page-about .rail-link[aria-current="true"],
.page-about .rail-link.is-active {
  color: var(--pulse-cyan);
  border-left-color: var(--pulse-cyan);
}

.page-about .rail-link[aria-current="true"]::before,
.page-about .rail-link.is-active::before {
  background: var(--pulse-cyan);
  box-shadow: 0 0 12px rgba(33, 230, 214, 0.85);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding-block: var(--about-sec-gap);
  border-top: var(--about-line) solid var(--hairline-500);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .sec-head {
  display: grid;
  justify-items: start;
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .chapter-num {
  display: inline-block;
  padding: 1px 12px;
  border: var(--about-line) solid var(--flare-orange);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: 0.1em;
  color: var(--flare-orange);
  background: transparent;
}

.page-about .sec-head h2,
.page-about .reach-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.008em;
}

.page-about .sec-head .lede {
  margin-bottom: 0;
}

.page-about .sec-tail {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

.page-about .sec-tail a {
  color: var(--pulse-cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(33, 230, 214, 0.4);
  transition: border-color 0.18s var(--ease);
}

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

/* ---------- 媒体 ---------- */
.page-about .media {
  margin: 0;
  overflow: hidden;
  border: var(--about-line) solid var(--hairline-500);
  border-radius: var(--radius);
  background: var(--abyss-800);
}

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

.page-about .media-caption {
  padding: 12px 16px;
  border-top: var(--about-line) solid var(--hairline-500);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-400);
}

.page-about .origin-banner {
  margin-bottom: clamp(32px, 4.6vw, 56px);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 44px) clamp(18px, 3vw, 30px);
  border-left: var(--about-line) solid var(--hairline-500);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 9px;
  width: 11px;
  height: 11px;
  transform: translateX(-50%);
  box-sizing: content-box;
  border: var(--about-line) solid var(--hairline-500);
  border-radius: 50%;
  background: var(--abyss-900);
}

.page-about .tl-item.is-current::before {
  border-color: var(--pulse-cyan);
  background: var(--pulse-cyan);
  box-shadow: 0 0 0 6px rgba(33, 230, 214, 0.16);
}

.page-about .tl-mark {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--pulse-cyan);
  letter-spacing: 0.01em;
}

.page-about .tl-item.is-current .tl-year {
  color: var(--mint-live);
}

.page-about .tl-ver {
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-400);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.45;
  color: var(--chalk-050);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

@media (min-width: 720px) {
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 0 clamp(18px, 2.6vw, 34px);
  }

  .page-about .tl-mark {
    margin-bottom: 0;
  }
}

/* ---------- 橙色斜切色带 ---------- */
.page-about .flare-band {
  position: relative;
  margin-block: clamp(28px, 4vw, 52px);
  padding-block: clamp(30px, 5vw, 56px);
  transform: skewY(-1.8deg);
  background: var(--flare-orange);
  border-top: var(--about-line) solid var(--abyss-950);
  border-bottom: var(--about-line) solid var(--abyss-950);
}

.page-about .flare-band-inner {
  transform: skewY(1.8deg);
}

.page-about .flare-quote {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5vw, 58px);
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--ink-950);
}

/* ---------- 团队与四条内容线 ---------- */
.page-about .crew-map {
  display: grid;
  gap: 0;
}

.page-about .crew-trunk {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: clamp(16px, 2.4vw, 24px) clamp(18px, 2.6vw, 28px);
  border: var(--about-line) solid var(--hairline-500);
  border-bottom: 0;
  background: var(--abyss-800);
}

.page-about .crew-trunk-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--chalk-050);
}

.page-about .crew-trunk-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--pulse-cyan);
}

.page-about .crew-trunk-unit {
  font-size: 13px;
  color: var(--mist-400);
}

.page-about .crew-branches {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crew-branch {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px clamp(14px, 2.4vw, 26px);
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  border: var(--about-line) solid var(--hairline-500);
  border-top: 0;
  transition: background 0.2s var(--ease);
}

.page-about .crew-branch:hover {
  background: var(--abyss-800);
}

.page-about .branch-idx {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--hairline-500);
  transition: color 0.18s var(--ease);
}

.page-about .crew-branch:hover .branch-idx {
  color: var(--pulse-cyan);
}

.page-about .branch-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2.1vw, 20px);
  color: var(--chalk-050);
  transition: transform 0.2s var(--ease);
}

.page-about .crew-branch:hover .branch-body h3 {
  transform: translateX(6px);
}

.page-about .branch-body p {
  margin: 0;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

/* ---------- 五步流程 ---------- */
.page-about .process-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .process-wrap {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(30px, 4vw, 56px);
  }
}

.page-about .process-steps {
  min-width: 0;
}

.page-about .details {
  border-top: var(--about-line) solid var(--hairline-500);
}

.page-about .details:last-of-type {
  border-bottom: var(--about-line) solid var(--hairline-500);
}

.page-about .details summary {
  position: relative;
  display: block;
  padding: 16px 42px 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(15.5px, 1.9vw, 19px);
  line-height: 1.6;
  color: var(--chalk-050);
  transition: color 0.18s var(--ease);
}

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

.page-about .details summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--pulse-cyan);
  transition: transform 0.22s var(--ease);
}

.page-about .details[open] summary {
  color: var(--pulse-cyan);
}

.page-about .details[open] summary::after {
  transform: translateY(-50%) rotate(135deg);
}

.page-about .details-body {
  padding: 0 0 18px;
}

.page-about .details-body p {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

.page-about .process-figure {
  margin: 0;
}

/* ---------- 版本演进 ---------- */
.page-about .verse-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .verse-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 4px clamp(14px, 2.4vw, 28px);
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-top: var(--about-line) solid var(--hairline-500);
}

.page-about .verse-item:last-child {
  border-bottom: var(--about-line) solid var(--hairline-500);
}

@media (min-width: 640px) {
  .page-about .verse-item {
    grid-template-columns: 96px minmax(0, 1fr);
  }
}

.page-about .verse-mark {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.page-about .verse-dot {
  display: block;
  width: 12px;
  height: 12px;
  box-sizing: content-box;
  border: var(--about-line) solid var(--hairline-500);
  border-radius: 50%;
  background: transparent;
}

.page-about .verse-item.is-current .verse-dot {
  border-color: var(--mint-live);
  background: var(--mint-live);
  animation: aboutPulse 2.4s ease-in-out infinite;
}

@keyframes aboutPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(95, 227, 155, 0.55); }
  50% { box-shadow: 0 0 0 10px rgba(95, 227, 155, 0); }
}

.page-about .verse-ver {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist-400);
}

.page-about .verse-item.is-current .verse-ver {
  color: var(--mint-live);
}

.page-about .verse-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.45;
  color: var(--chalk-050);
}

.page-about .verse-body p {
  margin: 0;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

/* ---------- 合作伙伴 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 860px) {
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }
}

.page-about .partner-cell {
  padding: clamp(22px, 3.2vw, 38px);
  border: var(--about-line) solid var(--hairline-500);
}

.page-about .partner-cell + .partner-cell {
  border-top: 0;
}

@media (min-width: 860px) {
  .page-about .partner-cell + .partner-cell {
    border-top: var(--about-line) solid var(--hairline-500);
    border-left: 0;
  }
}

.page-about .partner-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(46px, 8vw, 80px);
  font-weight: 700;
  line-height: 1;
  color: var(--pulse-cyan);
}

.page-about .partner-cell h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2.1vw, 21px);
  color: var(--chalk-050);
}

.page-about .partner-cell p {
  margin: 0;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

/* ---------- 联络 ---------- */
.page-about .sec-reach {
  padding-bottom: 0;
}

.page-about .reach-banner {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .reach-card {
  padding: clamp(24px, 3.6vw, 44px);
  border-radius: var(--radius-lg);
  background: var(--panel-700);
  box-shadow: var(--shadow-hard);
}

.page-about .reach-card .chapter-num {
  margin-bottom: 16px;
}

.page-about .reach-lede {
  margin: 16px 0 clamp(24px, 3.4vw, 36px);
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist-400);
}

.page-about .reach-list {
  margin: 0;
  display: grid;
}

.page-about .reach-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: var(--about-line) solid var(--hairline-500);
}

.page-about .reach-row:last-child {
  border-bottom: var(--about-line) solid var(--hairline-500);
}

@media (min-width: 720px) {
  .page-about .reach-row {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 0 clamp(18px, 3vw, 32px);
  }
}

.page-about .reach-row dt {
  font-family: var(--font-narrow);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist-400);
}

.page-about .reach-row dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--chalk-050);
}

.page-about .reach-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15.5px;
  word-break: break-all;
  color: var(--pulse-cyan);
}

.page-about .copy-btn {
  min-height: 36px;
  padding: 4px 14px;
  border: var(--about-line) solid var(--hairline-500);
  border-radius: var(--radius-pill);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 12.5px;
  color: var(--mist-400);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .copy-btn:hover,
.page-about .copy-btn:focus-visible {
  color: var(--chalk-050);
  border-color: var(--pulse-cyan);
}

.page-about .copy-btn[data-copied] {
  color: var(--ink-950);
  background: var(--mint-live);
  border-color: var(--mint-live);
}

.page-about .reach-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 响应式收尾 ---------- */
@media (max-width: 599px) {
  .page-about .flare-band {
    transform: skewY(-1.2deg);
  }

  .page-about .flare-band-inner {
    transform: skewY(1.2deg);
  }

  .page-about .reach-card {
    box-shadow: var(--shadow-hard-sm);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .gauge-trail,
  .page-about .gauge-ring,
  .page-about .verse-item.is-current .verse-dot {
    animation: none;
  }

  .page-about .rail-link,
  .page-about .crew-branch,
  .page-about .branch-idx,
  .page-about .branch-body h3,
  .page-about .details summary,
  .page-about .details summary::after,
  .page-about .copy-btn {
    transition: none;
  }
}
<<<END>>>