.page-about {
  --about-radius: 18px;
  background: var(--ink);
  color: var(--text);
  padding-bottom: 72px;
  overflow-x: hidden;
}

.page-about .crumbs {
  padding-top: 28px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 56px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -220px;
  right: -160px;
  width: 540px;
  height: 540px;
  border-radius: 46% 54% 63% 37% / 55% 42% 58% 45%;
  background: radial-gradient(circle at 38% 42%, rgba(57, 242, 200, 0.18), rgba(43, 217, 232, 0.06) 54%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 32px;
}

.page-about .eyebrow {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey);
  margin: 0;
}

.page-about .eyebrow .mono {
  color: var(--cyan);
  margin-right: 8px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 40px;
  line-height: 1.06;
  letter-spacing: 0.005em;
  margin: 12px 0 18px;
  max-width: 15em;
}

.page-about .serif-lead {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.6;
  color: var(--sand);
  margin: 0 0 16px;
  max-width: 34em;
}

.page-about .lede {
  font-size: 16px;
  line-height: 1.75;
  color: var(--body-soft);
  margin: 0;
  max-width: 40em;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-facts {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: 22px 20px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 16px;
  margin: 0;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact dd {
  margin: 0;
}

.page-about .about-fact .stat-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-fact .stat-label {
  font-size: 12px;
  color: var(--grey);
  letter-spacing: 0.04em;
}

.page-about .about-facts-note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding-block: 52px;
}

.page-about .about-sec-head {
  max-width: 700px;
  margin-bottom: 32px;
}

.page-about .about-sec-head .h2,
.page-about .about-origin-main .h2,
.page-about .about-method-intro .h2,
.page-about .about-partners-text .h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 30px;
  line-height: 1.12;
  margin: 10px 0 14px;
}

.page-about .about-sec-head .lede,
.page-about .about-origin .prose p,
.page-about .about-method-intro .lede,
.page-about .about-partners-text .lede {
  font-size: 16px;
  line-height: 1.75;
  color: var(--body-soft);
}

.page-about .h3 {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--text);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin-main .prose p {
  margin: 0 0 14px;
  max-width: 40em;
}

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

.page-about .about-origin-card {
  position: relative;
  background: linear-gradient(160deg, rgba(12, 33, 26, 0.95), rgba(6, 19, 15, 0.95));
  border: 1px solid var(--line);
  border-radius: 26px 26px 26px 6px;
  padding: 26px 22px;
}

.page-about .about-origin-card::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 26px;
  width: 56px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .about-card-kicker {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-card-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 12px;
  color: var(--text);
}

.page-about .about-card-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-soft);
  margin: 0 0 18px;
}

.page-about .about-card-tag {
  display: inline-block;
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions-figure {
  margin: 0 0 28px;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--panel-soft);
}

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

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

.page-about .about-node {
  border: 1px solid var(--line);
  border-left: 3px solid rgba(57, 242, 200, 0.55);
  border-radius: 14px;
  background: var(--panel);
  padding: 16px 18px;
  transition: border-color 0.12s ease, background 0.12s ease;
}

.page-about .about-node:hover {
  background: var(--panel-soft);
}

.page-about .about-node--now {
  border-left-color: var(--orange);
  background: linear-gradient(150deg, rgba(255, 139, 61, 0.1), rgba(12, 33, 26, 0.9) 46%);
}

.page-about .about-node-btn {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 12px;
  width: 100%;
  background: none;
  border: 0;
  padding: 0;
  margin: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-node-year {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-node--now .about-node-year {
  color: var(--orange);
}

.page-about .about-node-title {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-plus {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  align-self: center;
}

.page-about .about-plus::before,
.page-about .about-plus::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 1px;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.page-about .about-plus::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}

.page-about .about-plus::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about .about-node-btn[aria-expanded="true"] .about-plus::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-node-panel {
  display: none;
  padding-top: 12px;
}

.page-about .about-node-btn[aria-expanded="true"] + .about-node-panel {
  display: block;
}

.page-about .about-node-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-soft);
}

/* ---------- 内容方法 ---------- */
.page-about .about-method-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-method-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-method-note a {
  color: var(--blue);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-step {
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
}

.page-about .about-step-idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-step:nth-child(2) .about-step-idx {
  color: var(--blue);
}

.page-about .about-step:nth-child(3) .about-step-idx {
  color: var(--orange);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--body-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 24px;
}

.page-about .about-team-figure {
  margin: 0;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--line);
  border-radius: 26px 6px 26px 26px;
  overflow: hidden;
  background: var(--panel-soft);
}

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

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

.page-about .about-quad {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  transition: border-color 0.12s ease, transform 0.12s ease, background 0.12s ease;
}

.page-about .about-quad:hover,
.page-about .about-quad:focus-within {
  border-color: rgba(57, 242, 200, 0.45);
  background: var(--panel-soft);
  transform: translateY(-2px);
}

.page-about .about-quad p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--body-soft);
}

.page-about .about-quad-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px !important;
  opacity: 0.66;
  transition: opacity 0.12s ease;
}

.page-about .about-quad:hover .about-quad-tags,
.page-about .about-quad:focus-within .about-quad-tags {
  opacity: 1;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners-grid {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-supply {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-supply li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--body-soft);
}

.page-about .about-supply .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  min-width: 76px;
}

.page-about .about-partners-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-partners-figure {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--panel-soft);
}

.page-about .about-partners-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.page-about .about-partners-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 16px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sand);
  background: linear-gradient(180deg, rgba(2, 8, 6, 0), rgba(2, 8, 6, 0.82));
}

/* ---------- 承诺 ---------- */
.page-about .about-promise-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-promise-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-promise-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-soft);
  flex: 1 1 auto;
}

.page-about .about-promise-card--cyan {
  border-top: 3px solid var(--cyan);
}

.page-about .about-promise-card--orange {
  border-top: 3px solid var(--orange);
}

.page-about .about-promise-card--violet {
  border-top: 3px solid var(--violet);
}

.page-about .about-promise-link {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 217, 232, 0.4);
  align-self: flex-start;
  padding-bottom: 2px;
}

.page-about .about-promise-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-start {
  margin-top: 32px;
  display: grid;
  gap: 20px;
  padding: 24px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--about-radius);
  background: linear-gradient(120deg, rgba(57, 242, 200, 0.08), rgba(255, 139, 61, 0.07) 70%, rgba(12, 33, 26, 0.9));
}

.page-about .about-start-kicker {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .about-start-line {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
  max-width: 46em;
}

.page-about .about-start-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero h1 {
    font-size: 52px;
  }

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

  .page-about .section {
    padding-block: 64px;
  }

  .page-about .about-sec-head .h2,
  .page-about .about-origin-main .h2,
  .page-about .about-method-intro .h2,
  .page-about .about-partners-text .h2 {
    font-size: 36px;
  }

  .page-about .about-team-quad,
  .page-about .about-promise-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-versions-figure {
    aspect-ratio: 21 / 9;
  }

  .page-about .about-start {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 28px 26px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 32px 0 72px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero h1 {
    font-size: 60px;
  }

  .page-about .about-facts {
    grid-template-columns: 1fr 1fr;
    gap: 24px 18px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-origin-card {
    padding: 30px 26px;
  }

  .page-about .about-track {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    padding-bottom: 18px;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-node {
    flex: 0 0 268px;
    scroll-snap-align: start;
  }

  .page-about .about-method-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-method-intro {
    position: sticky;
    top: 96px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .about-promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-promise-card {
    padding: 26px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-quad,
  .page-about .about-node,
  .page-about .about-plus::before,
  .page-about .about-plus::after,
  .page-about .about-quad-tags {
    transition: none;
  }

  .page-about .about-quad:hover,
  .page-about .about-quad:focus-within {
    transform: none;
  }
}
<<<END>>>