.page-about {
  --about-ink-soft: #46536A;
  --about-rail: 40px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--about-ink-soft);
}

.page-about .breadcrumbs a {
  color: var(--royal);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 180ms ease, color 180ms ease;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--amber);
  color: var(--navy);
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: clamp(14px, 2.4vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-cover {
  position: relative;
  background:
    radial-gradient(circle at 88% 12%, rgba(47, 123, 255, 0.35), transparent 46%),
    var(--navy);
  color: var(--white);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(159, 179, 209, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(159, 179, 209, 0.16) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-about .about-cover__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(34px, 6vw, 68px);
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .about-cover__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-cover__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
  text-shadow: 5px 5px 0 rgba(18, 62, 124, 0.9);
}

.page-about .about-cover__lede {
  margin: 18px 0 0;
  max-width: 40ch;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.8;
  color: #DCE4F2;
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cover__index {
  border: var(--border-w) solid var(--amber);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 3vw, 26px);
  transform: rotate(-0.6deg);
}

.page-about .about-cover__index-head {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--royal);
}

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

.page-about .about-fact {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-fact__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 30px);
  line-height: 1;
  color: var(--navy);
  min-width: 2.6em;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-ink-soft);
}

.page-about .about-slash {
  height: 16px;
  background: linear-gradient(100deg, var(--amber) 0 52%, var(--magenta) 52% 100%);
  clip-path: polygon(0 46%, 100% 0, 100% 56%, 0 100%);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-top: clamp(38px, 5.5vw, 70px);
  padding-bottom: clamp(46px, 7vw, 88px);
}

.page-about .about-index {
  align-self: start;
  border-left: var(--border-w) solid var(--navy);
  padding-left: 14px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--about-ink-soft);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 4px 0;
  font-size: 14px;
  color: var(--royal);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 180ms ease, color 180ms ease;
}

.page-about .about-index__link span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--navy);
  border-bottom-color: var(--magenta);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(38px, 6vw, 72px);
  min-width: 0;
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: var(--border-w) solid var(--navy);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  color: var(--amber);
  -webkit-text-stroke: 1px var(--navy);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--navy);
}

.page-about .about-lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-chapter p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-chapter p a {
  color: var(--royal);
  text-decoration: none;
  border-bottom: 2px solid var(--amber);
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .about-chapter p a:hover,
.page-about .about-chapter p a:focus-visible {
  color: var(--magenta);
  border-bottom-color: var(--magenta);
}

/* ---------- 01 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

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

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

.page-about .about-split__media {
  margin: 0;
  border: var(--border-w) solid var(--navy);
  background: var(--white);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-split__caption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--about-ink-soft);
}

/* ---------- 02 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 var(--about-rail);
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: repeating-linear-gradient(
    to bottom,
    var(--line) 0 10px,
    transparent 10px 18px
  );
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: var(--border-w) solid var(--navy);
  background: var(--white);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-rail));
  top: 18px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--magenta);
  border: 3px solid var(--paper);
  box-shadow: 0 0 0 2px var(--navy);
}

.page-about .timeline__item:nth-child(even)::before {
  background: var(--teal);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  color: var(--royal);
}

.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.35;
  color: var(--navy);
}

.page-about .timeline__body p {
  margin: 4px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 03 团队 ---------- */
.page-about .role-grid {
  display: grid;
  gap: 14px;
}

.page-about .role-card {
  position: relative;
  padding: 18px 18px 20px;
  border: var(--border-w) solid var(--navy);
  background: var(--white);
  box-shadow: var(--shadow-hard-sm);
  border-top-width: 10px;
}

.page-about .role-card--magenta { border-top-color: var(--magenta); }
.page-about .role-card--blue { border-top-color: var(--blue); }
.page-about .role-card--teal { border-top-color: var(--teal); }

.page-about .role-card__count {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--navy);
}

.page-about .role-card__name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  color: var(--royal);
}

.page-about .role-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-wide-media {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: var(--border-w) solid var(--navy);
  background: var(--navy);
}

.page-about .about-wide-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.page-about .about-wide-media figcaption {
  padding: 10px 14px;
  background: var(--navy);
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
}

.page-about .about-wide-media--dark figcaption {
  color: var(--amber);
}

/* ---------- 04 方法 ---------- */
.page-about .method-steps {
  display: grid;
  gap: 14px;
}

.page-about .method-step {
  padding: 18px;
  background: var(--paper-deep);
  border: 2px solid var(--line);
  border-left: 8px solid var(--royal);
}

.page-about .method-step:nth-child(2) { border-left-color: var(--magenta); }
.page-about .method-step:nth-child(3) { border-left-color: var(--amber); }
.page-about .method-step:nth-child(4) { border-left-color: var(--teal); }

.page-about .method-step__num {
  display: inline-block;
  padding: 2px 8px;
  margin-bottom: 8px;
  background: var(--navy);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .method-step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.35;
  color: var(--navy);
}

.page-about .method-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .method-note {
  margin-top: clamp(18px, 3vw, 26px);
  padding: 18px;
  background: var(--mint);
  color: var(--white);
  border: var(--border-w) solid var(--navy);
}

.page-about .method-note__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-about .module-chips {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .module-chips li {
  padding: 5px 11px;
  border: 2px solid var(--teal);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .method-note__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #C9DCD6;
}

.page-about .method-note__text a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 2px solid var(--amber);
}

.page-about .method-note__text a:hover,
.page-about .method-note__text a:focus-visible {
  color: var(--white);
}

/* ---------- 05 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 14px;
}

.page-about .eco-card {
  padding: 18px;
  border: var(--border-w) solid var(--navy);
  background: var(--white);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .eco-card__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--navy);
}

.page-about .eco-card--amber .eco-card__value { color: #B87614; }
.page-about .eco-card--blue .eco-card__value { color: var(--blue); }
.page-about .eco-card--teal .eco-card__value { color: #0E9B80; }
.page-about .eco-card--magenta .eco-card__value { color: var(--magenta); }

.page-about .eco-card__name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.4;
  color: var(--royal);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .eco-text {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 16px;
  border-left: 6px solid var(--amber);
  max-width: 44ch;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 4vw, 34px);
  background:
    linear-gradient(135deg, rgba(230, 60, 122, 0.18), transparent 60%),
    var(--navy);
  border: var(--border-w) solid var(--amber);
  color: var(--white);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
  color: #D5DEEC;
}

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

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .about-cover__index {
    transform: none;
  }
}

/* ---------- 窄屏细节 ---------- */
@media (max-width: 420px) {
  .page-about .about-cover__actions .btn,
  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
  .page-about .about-fact {
    grid-template-columns: 1fr;
    gap: 2px;
  }
  .page-about .about-fact__value {
    min-width: 0;
  }
}

/* ---------- 平板及桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-cover__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(240px, 0.55fr);
    align-items: start;
  }
  .page-about .about-cover__index {
    margin-top: 10px;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
  .page-about .role-grid,
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .method-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 24px;
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 6px;
  }
  .page-about .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .timeline {
    gap: 18px;
  }
  .page-about .timeline__item {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: start;
    gap: 16px;
    padding: 16px 20px;
  }
  .page-about .timeline__year {
    font-size: 24px;
    padding-top: 4px;
  }
  .page-about .timeline__body p {
    margin-top: 6px;
  }
  .page-about .method-note {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 8px 24px;
  }
  .page-about .method-note__label {
    grid-column: 1 / -1;
  }
  .page-about .module-chips {
    margin-bottom: 0;
  }
}
<<<END>>>