.page-about {
  --about-line: rgba(43, 245, 200, 0.22);
  --about-line-soft: rgba(43, 245, 200, 0.12);
  --about-soft: rgba(43, 245, 200, 0.08);
  --about-paper-line: rgba(27, 34, 31, 0.16);
  --about-paper-soft: rgba(27, 34, 31, 0.06);
  background: var(--ink-950);
  color: var(--cyan-200);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .band--paper {
  color: var(--carbon-900);
}

.page-about .breadcrumb {
  margin-bottom: 6px;
}

.page-about .breadcrumb__list {
  color: var(--mist-500);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 44px;
  background:
    radial-gradient(120% 100% at 86% -12%, rgba(43, 245, 200, 0.16), transparent 62%),
    radial-gradient(90% 80% at -5% 105%, rgba(255, 210, 74, 0.08), transparent 66%),
    var(--ink-900);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: 16px;
}

.page-about .about-hero__copy h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 8.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--cyan-200);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__rail {
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(4, 21, 15, 0.45);
  padding: 14px 14px 16px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist-500);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail li {
  flex: 0 0 auto;
  padding: 5px 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan-200);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-sm);
  background: rgba(12, 66, 52, 0.5);
}

.page-about .about-rail li.about-rail__now {
  color: var(--ink-950);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  font-weight: 700;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stats__item {
  background: var(--ink-900);
  padding: 14px 14px 16px;
}

.page-about .about-stats__value {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  color: var(--yellow-400);
  letter-spacing: 0.02em;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(166, 255, 232, 0.68);
}

/* ---------- 章节公共 ---------- */
.page-about .about-sec {
  padding: 44px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-head {
  max-width: 46em;
  margin-bottom: 26px;
}

.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .band--paper .about-h2 {
  color: var(--carbon-900);
}

.page-about .about-text {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-head__lead {
  color: inherit;
  opacity: 0.86;
}

.page-about .about-split {
  display: grid;
  gap: 24px;
}

.page-about .about-split__aside {
  display: grid;
  gap: 14px;
}

/* ---------- 起点 ---------- */
.page-about .about-note {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  background: #FFFFFF;
}

.page-about .about-note--wire {
  background: var(--paper);
}

.page-about .about-note__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist-500);
}

.page-about .about-note__v {
  margin: 8px 0 0;
  font-size: 38px;
  line-height: 1;
  color: var(--ink-700);
  letter-spacing: -0.02em;
}

.page-about .about-note__v span {
  font-family: var(--font-body);
  font-size: 15px;
  margin-left: 4px;
  letter-spacing: 0;
}

.page-about .about-note__d {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-500);
}

/* ---------- 时间轴 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-400) 0%, rgba(43, 245, 200, 0.1) 100%);
}

.page-about .about-track__node {
  position: relative;
  padding-bottom: 10px;
}

.page-about .about-track__node::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 15px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--yellow-400);
  box-shadow: 0 0 0 3px var(--ink-950);
}

.page-about .about-track__figure {
  position: relative;
  padding: 6px 0 22px;
}

.page-about .about-track__figure::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 18px;
  width: 2px;
  height: 14px;
  background: var(--cyan-400);
}

.page-about .about-step {
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-md);
  background: var(--ink-700);
  overflow: hidden;
  transition: border-color 180ms var(--ease);
}

.page-about .about-step[open] {
  border-color: var(--about-line);
}

.page-about .about-step summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  padding: 14px 40px 14px 14px;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .about-step summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan-400);
  transition: transform 180ms var(--ease);
}

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

.page-about .about-step__v {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-950);
  background: var(--cyan-400);
  border-radius: var(--r-sm);
  padding: 3px 7px;
  font-weight: 700;
}

.page-about .about-step__t {
  font-size: 15px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step__d {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(166, 255, 232, 0.82);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: 0 0 var(--r-md) var(--r-md);
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .band--paper .about-figure {
  border-color: var(--about-paper-line);
  background: var(--paper);
}

.page-about .about-figure--wide {
  margin-bottom: 30px;
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
}

.page-about .about-team__card {
  padding: 18px 18px 20px;
  background: #FFFFFF;
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
}

.page-about .about-team__num {
  margin: 0;
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-700);
}

.page-about .about-team__h {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--carbon-900);
}

.page-about .about-team__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--about-paper-soft);
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--carbon-900);
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 14px;
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--mist-500);
}

.page-about .about-team__link {
  margin: 16px 0 0;
  font-size: 13.5px;
  color: var(--mist-500);
}

.page-about .about-team__link a {
  color: var(--ink-700);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-team__foot {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid var(--yellow-400);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--carbon-900);
}

/* ---------- 数据流转 ---------- */
.page-about .about-flow__map {
  display: none;
  width: 100%;
  height: auto;
  margin: 0 0 6px;
}

.page-about .about-flow__poly {
  fill: none;
  stroke: var(--cyan-400);
  stroke-width: 2;
  stroke-linejoin: round;
}

.page-about .about-flow__dot {
  fill: var(--yellow-400);
}

.page-about .about-flow__dot--end {
  fill: var(--cyan-400);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow__step {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-line-soft);
  border-left: 2px solid var(--cyan-400);
  border-radius: var(--r-md);
  background: var(--ink-700);
}

.page-about .about-flow__when {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--yellow-400);
}

.page-about .about-flow__h {
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow__d {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(166, 255, 232, 0.8);
}

.page-about .about-flow__shot {
  margin-top: 22px;
}

.page-about .about-flow__shot .about-figure {
  border-color: var(--about-line-soft);
  background: var(--ink-950);
}

.page-about .about-flow__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(166, 255, 232, 0.76);
}

/* ---------- 合作 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-facts li {
  background: #FFFFFF;
  padding: 14px 16px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-facts__v {
  flex: 0 0 auto;
  min-width: 76px;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-700);
}

.page-about .about-facts__v span {
  font-family: var(--font-body);
  font-size: 13px;
  margin-left: 2px;
  letter-spacing: 0;
}

.page-about .about-facts__k {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--carbon-900);
}

/* ---------- 节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 12px;
}

.page-about .about-rhythm__item {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-md);
  background: rgba(12, 66, 52, 0.5);
}

.page-about .about-rhythm__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--yellow-400);
}

.page-about .about-rhythm__h {
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-rhythm__d {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(166, 255, 232, 0.8);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-bottom: none;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
  padding: 26px 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background:
    linear-gradient(135deg, rgba(43, 245, 200, 0.1), transparent 55%),
    var(--ink-900);
}

.page-about .about-cta__lead {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cyan-200);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 32px 0 56px;
  }
  .page-about .about-hero__lead {
    font-size: 17px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-stats__item {
    padding: 18px 18px 20px;
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cta__inner {
    padding: 34px 30px;
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-sec {
    padding: 72px 0;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-rail {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }
  .page-about .about-rail li {
    display: flex;
    justify-content: space-between;
    padding: 5px 10px;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }
  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
  .page-about .about-track {
    padding-left: 34px;
    max-width: 980px;
  }
  .page-about .about-track::before {
    left: 7px;
  }
  .page-about .about-track__node::before {
    left: -34px;
    top: 17px;
    width: 13px;
    height: 13px;
  }
  .page-about .about-track__figure::before {
    left: -27px;
  }
  .page-about .about-track__figure {
    max-width: 620px;
  }
  .page-about .about-step summary {
    padding: 16px 46px 16px 18px;
  }
  .page-about .about-step__t {
    font-size: 16px;
  }
  .page-about .about-step__d {
    padding: 0 20px 18px;
    font-size: 15px;
  }
  .page-about .about-flow__map {
    display: block;
    margin-bottom: 14px;
  }
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-flow__shot {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 5fr);
    gap: 32px;
    align-items: center;
    margin-top: 34px;
  }
  .page-about .about-flow__note {
    margin: 0;
    font-size: 15px;
  }
  .page-about .about-figure--wide {
    margin-bottom: 40px;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-step summary::after {
    transition: none;
  }
}
<<<END>>>