.page-about {
  --about-line: var(--line-000);
  --about-panel: var(--ink-100);
  --about-raise: var(--ink-200);
  --about-gap: clamp(24px, 4vw, 48px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-block: 18px 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 8px 0;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 9vw, 6rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--paper);
  margin: 10px 0 18px;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
  margin: 0 0 22px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--about-line);
  border: 2px solid var(--about-line);
  box-shadow: var(--hard);
}

.page-about .about-fact {
  background: var(--about-panel);
  padding: 16px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-40);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--volt);
}

.page-about .about-fact__label {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin: 28px 0 0;
  border: 2px solid var(--about-line);
  background: var(--about-panel);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--muted);
  border-top: 2px solid var(--about-line);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding-block: clamp(48px, 8vw, 88px);
  border-top: 2px solid var(--about-line);
  margin-top: clamp(40px, 7vw, 72px);
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about .about-section h3 {
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}

.page-about .about-section__lede {
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--muted);
  margin: 0 0 24px;
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-main p {
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
  margin: 0 0 16px;
}

.page-about .about-main p a,
.page-about .about-section__lede a,
.page-about .about-partners__cta a,
.page-about .about-note__d a {
  color: var(--volt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-main p a:hover,
.page-about .about-partners__cta a:hover,
.page-about .about-note__d a:hover {
  color: var(--lime);
}

/* ---------- 右侧注脚栏 ---------- */
.page-about .about-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-about .about-note {
  border: 2px solid var(--about-line);
  border-left: 6px solid var(--volt);
  background: var(--about-raise);
  padding: 16px 16px 18px;
  box-shadow: var(--hard);
}

.page-about .about-note--signal {
  border-left-color: var(--signal);
  background: var(--about-panel);
}

.page-about .about-note__k {
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 8px;
}

.page-about .about-note__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-note__d {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .about-note__links {
  margin: 14px 0 0;
}

/* ---------- 团队构成 ---------- */
.page-about .about-team {
  margin-top: 8px;
}

.page-about .about-bar {
  display: flex;
  height: 58px;
  border: 2px solid var(--about-line);
  background: var(--about-raise);
  overflow: hidden;
  box-shadow: var(--hard);
}

.page-about .about-bar__seg {
  display: block;
  height: 100%;
  transition: filter var(--dur) var(--ease);
}

.page-about .about-bar__seg--ops { flex: 18; background: var(--volt); }
.page-about .about-bar__seg--check { flex: 6; background: var(--cyan); }
.page-about .about-bar__seg--fe { flex: 5; background: var(--signal); }

.page-about .about-bar__seg:hover { filter: brightness(1.18); }

.page-about .about-legend {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.page-about .about-legend__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-legend__item strong {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-16);
  color: var(--paper);
}

.page-about .about-legend__dot {
  display: block;
  width: 10px;
  height: 10px;
}

.page-about .about-legend__item--ops .about-legend__dot { background: var(--volt); }
.page-about .about-legend__item--check .about-legend__dot { background: var(--cyan); }
.page-about .about-legend__item--fe .about-legend__dot { background: var(--signal); }

.page-about .about-roles {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-role {
  border: 2px solid var(--about-line);
  border-top-width: 6px;
  background: var(--about-panel);
  padding: 18px 16px 16px;
}

.page-about .about-role--ops { border-top-color: var(--volt); }
.page-about .about-role--check { border-top-color: var(--cyan); }
.page-about .about-role--fe { border-top-color: var(--signal); }

.page-about .about-role p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper);
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 6px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-flow__item { min-width: 0; }

.page-about .about-flow__step {
  border: 2px solid var(--about-line);
  background: var(--about-raise);
  box-shadow: var(--hard);
}

.page-about .about-flow__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 16px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-flow__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  line-height: 1;
  color: var(--volt);
}

.page-about .about-flow__step[open] .about-flow__head::after { content: "−"; }

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-flow__title {
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow__body {
  padding: 0 16px 16px;
  border-top: 2px solid var(--about-line);
  margin-top: 2px;
}

.page-about .about-flow__body p {
  max-width: 32em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper);
  margin: 14px 0 0;
}

.page-about .about-flow__body p a {
  color: var(--volt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-flow__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-12) !important;
  letter-spacing: 0.04em;
  color: var(--cyan) !important;
}

.page-about .about-flow__figure {
  margin: 0;
  border: 2px solid var(--about-line);
  background: var(--about-panel);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-flow__figure figcaption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--muted);
  border-top: 2px solid var(--about-line);
}

/* ---------- 赛季刻度线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--about-line);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 10px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 14px;
  height: 2px;
  background: var(--about-line);
  transition: background var(--dur) var(--ease);
}

.page-about .about-timeline__item:has(details[open])::before {
  background: var(--signal);
  height: 4px;
  top: 23px;
}

.page-about .about-season {
  border: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

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

.page-about .about-season__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 10px 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-season__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  line-height: 1;
  color: var(--muted);
}

.page-about .about-season[open] .about-season__sum::after {
  content: "−";
  color: var(--volt);
}

.page-about .about-season__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .about-season[open] .about-season__year { color: var(--volt); }

.page-about .about-season__title {
  font-size: var(--fs-16);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-season__body {
  padding: 0 12px 14px;
}

.page-about .about-season__body p {
  max-width: 32em;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__figure {
  margin: 0 0 24px;
  border: 2px solid var(--about-line);
  background: var(--about-panel);
}

.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-partners__figure figcaption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--muted);
  border-top: 2px solid var(--about-line);
}

.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--about-line);
  border: 2px solid var(--about-line);
}

.page-about .about-partner {
  background: var(--about-panel);
  padding: 22px 20px 20px;
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-64);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--volt);
  margin-bottom: 12px;
}

.page-about .about-partner p {
  margin: 0;
  max-width: 32em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-partners__cta {
  margin: 22px 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
  max-width: 34em;
}

/* ---------- 质量与合规 ---------- */
.page-about .about-checks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 6px;
}

.page-about .about-check {
  border: 2px solid var(--about-line);
  background: var(--about-panel);
  padding: 18px 16px 16px;
  position: relative;
}

.page-about .about-check::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 42%;
  height: 4px;
  background: var(--signal);
}

.page-about .about-check:nth-child(2n)::before { background: var(--volt); }
.page-about .about-check:nth-child(3n)::before { background: var(--cyan); }

.page-about .about-check p {
  margin: 0;
  max-width: 32em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-tail {
  margin: clamp(40px, 7vw, 72px) 0 0;
  padding: 24px 0 8px;
  border-top: 2px solid var(--about-line);
}

.page-about .about-tail p {
  max-width: 32em;
  font-size: var(--fs-20);
  line-height: 1.7;
  font-weight: 500;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about .about-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: var(--fs-14) !important;
  font-weight: 400 !important;
}

.page-about .about-tail__links a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid var(--about-line);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tail__links a:hover {
  color: var(--volt);
  border-color: var(--volt);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3.5fr);
    gap: var(--about-gap);
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-side--figure {
    justify-content: flex-end;
  }

  /* 四步流程的对角线推进 */
  .page-about .about-flow__item:nth-child(2) { margin-left: 26px; }
  .page-about .about-flow__item:nth-child(3) { margin-left: 52px; }
  .page-about .about-flow__item:nth-child(4) { margin-left: 78px; }

  .page-about .about-flow__item:nth-child(n+2)::before {
    content: "";
    display: block;
    width: 2px;
    height: 16px;
    margin-left: -14px;
    margin-bottom: 0;
    background: var(--about-line);
    transform: rotate(35deg);
    transform-origin: bottom left;
  }

  .page-about .about-season__sum {
    padding: 12px 16px;
  }

  .page-about .about-season__body {
    padding: 0 16px 16px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero {
    padding-block: 16px 0;
  }

  .page-about .about-fact__num {
    font-size: var(--fs-64);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar__seg,
  .page-about .about-timeline__item::before,
  .page-about .about-season,
  .page-about .about-season__year,
  .page-about .about-tail__links a {
    transition: none;
  }
}
<<<END>>>