.page-about {
  --about-line: rgba(110, 120, 145, 0.22);
  --about-line-soft: rgba(110, 120, 145, 0.14);
  --about-pad: 44px;
  background: var(--bg-base);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .ex-container {
  min-width: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 52px;
  background:
    radial-gradient(circle at 82% 8%, rgba(53, 230, 255, 0.16), transparent 46%),
    radial-gradient(circle at 8% 92%, rgba(123, 92, 255, 0.2), transparent 52%),
    var(--bg-base);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}

.page-about .ex-breadcrumb {
  margin-bottom: 26px;
  font-size: 13px;
  color: var(--grid);
}

.page-about .ex-breadcrumb a {
  color: var(--text-2);
  text-decoration: none;
}

.page-about .ex-breadcrumb a:hover {
  color: var(--accent);
}

.page-about .ex-breadcrumb__sep {
  margin: 0 8px;
  color: var(--grid);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(32px, 8.6vw, 68px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.03em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-2);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px 20px;
  background: var(--surface-violet);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text);
}

.page-about .about-stat__unit {
  margin-left: 2px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--grid);
}

.page-about .about-stat--accent .about-stat__num {
  color: var(--accent);
}

/* ---------- 轨道 + 主体 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 0;
  padding-bottom: 72px;
}

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

.page-about .about-body {
  min-width: 0;
  background: linear-gradient(
    180deg,
    rgba(27, 16, 53, 0) 0%,
    rgba(27, 16, 53, 0.45) 22%,
    rgba(27, 16, 53, 0.78) 58%,
    rgba(27, 16, 53, 0.32) 100%
  );
}

.page-about .about-sec {
  position: relative;
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: calc(var(--about-pad) + 8px);
}

/* ---------- 章节标题 ---------- */
.page-about .about-h2 {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(24px, 5.6vw, 38px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-about .about-h2::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 22px;
  background: linear-gradient(180deg, var(--accent), var(--interactive));
  clip-path: polygon(38% 0, 100% 0, 62% 100%, 0 100%);
}

.page-about .about-sec__intro {
  max-width: 36em;
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grid);
}

/* ---------- 起点长文 ---------- */
.page-about .about-prose {
  max-width: 34em;
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-2);
}

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

.page-about .about-prose p::first-letter {
  color: var(--text);
}

.page-about .about-inline-link {
  margin-top: 26px;
  padding-left: 14px;
  border-left: 2px solid var(--accent-2);
  font-size: 14px;
  line-height: 1.8;
  color: var(--grid);
}

.page-about .about-inline-link a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 255, 0.4);
}

.page-about .about-inline-link a:hover {
  color: var(--text);
  border-bottom-color: var(--accent-2);
}

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  position: relative;
  padding: 22px 20px 24px;
  background: linear-gradient(160deg, rgba(42, 26, 82, 0.95), rgba(27, 16, 53, 0.75));
  border-left: 2px solid var(--interactive);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
  transition: border-color 120ms var(--ease), transform 120ms var(--ease);
}

.page-about .about-principle:hover {
  border-left-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.page-about .about-principle__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-principle__desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-principle__do {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--grid);
}

.page-about .about-principle__do span {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 7px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--bg-base);
  background: var(--accent-2);
  clip-path: polygon(0 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

/* ---------- 流程 ---------- */
.page-about .about-flow__layout {
  display: grid;
  gap: 26px;
}

.page-about .about-flow {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 18px;
  background: rgba(42, 26, 82, 0.8);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--notch) 100%, 0 calc(100% - var(--notch)));
  transition: background 120ms var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-visible {
  background: rgba(43, 32, 84, 1);
  outline: none;
}

.page-about .about-flow__step:focus-visible {
  box-shadow: inset 0 0 0 1px var(--accent);
}

.page-about .about-flow__time {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--bg-base);
  background: var(--accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.page-about .about-flow__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-flow__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-flow__role {
  margin: 0;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--grid);
  background: rgba(6, 7, 14, 0.55);
  opacity: 0.6;
  transition: opacity 120ms var(--ease), color 120ms var(--ease);
}

.page-about .about-flow__step:hover .about-flow__role,
.page-about .about-flow__step:focus .about-flow__role {
  opacity: 1;
  color: var(--text-2);
}

.page-about .about-flow__role span {
  margin-right: 8px;
  color: var(--accent-2);
  letter-spacing: 0.04em;
}

/* ---------- 图片块 ---------- */
.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  background: var(--bg-nebula);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--grid);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-figure--wide {
  margin-bottom: 22px;
}

.page-about .about-figure--wide img {
  max-height: 200px;
}

.page-about .about-figure--team {
  margin-bottom: 26px;
}

/* ---------- 发展节点 ---------- */
.page-about .about-miles {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-mile {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line-soft);
  transition: background 120ms var(--ease);
}

.page-about .about-mile:hover {
  background: rgba(53, 230, 255, 0.04);
}

.page-about .about-mile__mark {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.04em;
  color: var(--accent);
  word-break: break-word;
}

.page-about .about-mile__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-mile__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__figures {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .about-figure-card {
  padding: 20px 18px 22px;
  background: rgba(27, 16, 53, 0.9);
  border-top: 2px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
}

.page-about .about-figure-card--alt {
  border-top-color: var(--chart-pink);
}

.page-about .about-figure-card__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grid);
}

.page-about .about-figure-card__num {
  display: block;
  margin: 6px 0 2px;
  font-family: var(--font-mono);
  font-size: 52px;
  font-weight: 700;
  line-height: 0.94;
  letter-spacing: -0.05em;
  color: var(--text);
}

.page-about .about-figure-card__unit {
  display: block;
  font-size: 13px;
  color: var(--accent);
}

.page-about .about-figure-card p {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-partners__notes {
  display: grid;
  gap: 18px;
}

.page-about .about-note h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  padding-left: 12px;
  border-left: 3px solid var(--accent-2);
}

.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-2);
}

/* ---------- 岗位 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  padding: 18px 18px 20px;
  background: rgba(42, 26, 82, 0.55);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-role__tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  padding: var(--about-pad) 0 0;
}

.page-about .about-cta__inner {
  position: relative;
  padding: 28px 20px 30px;
  background:
    radial-gradient(circle at 90% 0%, rgba(255, 106, 43, 0.22), transparent 60%),
    linear-gradient(150deg, rgba(42, 26, 82, 0.95), rgba(6, 7, 14, 0.9));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 5.4vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-cta__text {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-2);
}

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

.page-about .about-cta__actions .ex-btn {
  text-decoration: none;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about {
    --about-pad: 56px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partners__figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partners__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

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

  .page-about .about-mile {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-mile__mark {
    font-size: 21px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --about-pad: 76px;
  }

  .page-about .about-hero {
    padding: calc(var(--header-h) + 64px) 0 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    gap: 48px;
    align-items: end;
  }

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

  .page-about .about-stat__num {
    font-size: 40px;
  }

  .page-about .about-shell {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 56px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    padding-top: 24px;
  }

  .page-about .about-rail__label {
    margin: 0 0 14px;
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--grid);
  }

  .page-about .about-rail__list {
    position: relative;
    margin: 0;
    padding: 0 0 0 20px;
    list-style: none;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--accent), rgba(53, 230, 255, 0.15) 70%, transparent);
  }

  .page-about .about-rail__list li + li {
    margin-top: 16px;
  }

  .page-about .about-rail__link {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-size: 13px;
    line-height: 1.4;
    color: var(--grid);
    text-decoration: none;
    transition: color 120ms var(--ease), transform 120ms var(--ease);
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 5px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--grid);
    box-shadow: 0 0 0 0 rgba(53, 230, 255, 0);
    transition: background 120ms var(--ease), box-shadow 120ms var(--ease);
  }

  .page-about .about-rail__link:hover {
    color: var(--text);
    transform: translateX(2px);
  }

  .page-about .about-rail__link:hover::before {
    background: var(--accent);
  }

  .page-about .about-rail__link[aria-current="true"] {
    color: var(--accent);
  }

  .page-about .about-rail__link[aria-current="true"]::before {
    background: var(--accent);
    box-shadow: 0 0 10px 2px rgba(53, 230, 255, 0.55);
  }

  .page-about .about-rail__idx {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--interactive);
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }

  .page-about .about-principle:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-principle:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-flow__layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.9fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: 1fr;
  }

  .page-about .about-flow__step {
    padding: 22px 24px 20px;
  }

  .page-about .about-flow__step + .about-flow__step {
    margin-left: 34px;
  }

  .page-about .about-mile {
    grid-template-columns: 138px minmax(0, 1fr);
    gap: 28px;
    padding: 16px 0;
  }

  .page-about .about-mile__mark {
    font-size: 25px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
    border-top: 1px solid var(--about-line);
  }

  .page-about .about-role {
    padding: 22px 0 24px;
    background: none;
  }

  .page-about .about-cta__inner {
    padding: 40px 44px 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-flow__step,
  .page-about .about-flow__role,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-principle:hover,
  .page-about .about-rail__link:hover {
    transform: none;
  }
}
<<<END>>>