.page-about {
  --about-line: rgba(169, 180, 198, 0.18);
  --about-line-strong: rgba(169, 180, 198, 0.34);
  --about-tick: 88px;
  --about-glow: rgba(47, 224, 166, 0.22);
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.15rem + 1.6vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--paper);
  font-weight: 800;
}

.page-about .section__head {
  margin-bottom: 28px;
}

.page-about .about-timeline__note {
  margin: 14px 0 0;
  max-width: 58ch;
  color: var(--mist);
  font-size: var(--fs-16);
  line-height: 1.75;
}

.page-about p {
  line-height: 1.8;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 clamp(44px, 7vw, 84px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -12%;
  width: min(560px, 78vw);
  height: min(560px, 78vw);
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-glow), transparent 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(20px, 4vw, 36px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(169, 180, 198, 0.5);
}

.page-about .breadcrumb__list a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__list a:hover {
  color: var(--cyan);
}

.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--gold);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 1.25rem + 3.1vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 14px 0 0;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__intro {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-hero__stats::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--maple), var(--gold) 48%, var(--aurora));
  opacity: 0.85;
}

.page-about .about-stat {
  background: var(--ink-2);
  padding: 22px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 1.2rem + 2vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-stat:nth-child(1) .about-stat__num { color: var(--maple); }
.page-about .about-stat:nth-child(3) .about-stat__num { color: var(--aurora); }

.page-about .about-stat__unit {
  font-size: var(--fs-14);
  color: var(--mist);
  line-height: 1.5;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__prose {
  max-width: 62ch;
}

.page-about .about-origin__prose p {
  margin: 16px 0 0;
  color: var(--mist);
  font-size: var(--fs-16);
}

.page-about .about-origin__card {
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3.4vw, 32px);
}

.page-about .about-origin__card-kicker {
  margin: 0 0 18px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--aurora);
}

.page-about .about-origin__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-origin__list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding-top: 18px;
  border-top: 1px dashed var(--about-line);
}

.page-about .about-origin__list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-origin__idx {
  font-size: var(--fs-12);
  color: var(--maple);
  padding-top: 3px;
}

.page-about .about-origin__list strong {
  display: block;
  font-size: var(--fs-16);
  color: var(--paper);
  margin-bottom: 4px;
}

.page-about .about-origin__list span:not(.about-origin__idx) {
  font-size: var(--fs-14);
  color: var(--mist);
  line-height: 1.7;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__banner {
  margin: 0 0 clamp(30px, 5vw, 52px);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  position: relative;
}

.page-about .about-timeline__banner::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--maple), var(--gold), var(--aurora));
}

.page-about .about-timeline__banner .media__img,
.page-about .about-timeline__banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-timeline__banner .media__caption {
  display: block;
  padding: 12px 18px 16px;
  font-size: var(--fs-14);
  color: var(--mist);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .about-timeline__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 24px 0 24px 18px;
  border-top: 1px solid var(--about-line);
  transition: opacity 0.24s var(--ease);
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--maple), transparent 82%);
  opacity: 0.5;
}

.page-about .about-tl[data-filter-item~="growth"]::before {
  background: linear-gradient(180deg, var(--gold), transparent 82%);
}

.page-about .about-tl[data-filter-item~="mature"]::before {
  background: linear-gradient(180deg, var(--aurora), transparent 82%);
}

.page-about .about-tl.is-hidden {
  display: none;
}

.page-about .about-tl__scale {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-tl__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
  background: var(--maple);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.16);
}

.page-about .about-tl[data-filter-item~="growth"] .about-tl__dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 179, 75, 0.16);
}

.page-about .about-tl[data-filter-item~="mature"] .about-tl__dot {
  background: var(--aurora);
  box-shadow: 0 0 0 4px rgba(47, 224, 166, 0.16);
}

.page-about .about-tl__ver {
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--paper-2);
}

.page-about .about-tl__body h3 {
  margin: 0;
  font-size: clamp(1.05rem, 1rem + 0.35vw, 1.25rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-tl__body p {
  margin: 8px 0 0;
  font-size: var(--fs-16);
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-team__copy p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: var(--fs-16);
  max-width: 62ch;
}

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

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-team__figure .media__caption {
  display: block;
  padding: 12px 18px 16px;
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .about-team__roles {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-role {
  background: var(--ink-2);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-role__num {
  font-size: var(--fs-32);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-role--edit .about-role__num { color: var(--maple); }
.page-about .about-role--tech .about-role__num { color: var(--aurora); }
.page-about .about-role--coop .about-role__num { color: var(--cyan); }

.page-about .about-role h3 {
  margin: 0;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-role p {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 生态 ---------- */
.page-about .about-eco__grid p {
  margin: 16px 0 0;
  color: var(--mist);
  font-size: var(--fs-16);
  max-width: 60ch;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-eco__list li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .about-eco__mark {
  width: 12px;
  height: 12px;
  margin-top: 6px;
  border-radius: 50%;
  flex: none;
}

.page-about .about-eco__mark--a { background: var(--maple); box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14); }
.page-about .about-eco__mark--b { background: var(--gold); box-shadow: 0 0 0 4px rgba(242, 179, 75, 0.14); }
.page-about .about-eco__mark--c { background: var(--aurora); box-shadow: 0 0 0 4px rgba(47, 224, 166, 0.14); }

.page-about .about-eco__list strong {
  display: block;
  font-size: var(--fs-16);
  color: var(--paper);
  margin-bottom: 4px;
}

.page-about .about-eco__list span:not(.about-eco__mark) {
  font-size: var(--fs-14);
  color: var(--mist);
  line-height: 1.72;
}

.page-about .about-eco__cta {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--about-line);
  font-size: var(--fs-14) !important;
  color: var(--mist);
}

.page-about .about-eco__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  position: relative;
}

.page-about .about-eco__figure::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 78% 22%, rgba(89, 199, 242, 0.16), transparent 62%);
  pointer-events: none;
}

.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-eco__figure .media__caption {
  display: block;
  padding: 12px 18px 16px;
  font-size: var(--fs-14);
  color: var(--mist);
}

/* ---------- 覆盖 ---------- */
.page-about .about-reach__copy p {
  margin: 16px 0 0;
  color: var(--mist);
  font-size: var(--fs-16);
  max-width: 60ch;
}

.page-about .about-reach__panel {
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3.4vw, 32px);
}

.page-about .about-reach__panel-kicker {
  margin: 0 0 20px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--aurora);
}

.page-about .about-dots {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 26px;
}

.page-about .about-dots__cell {
  aspect-ratio: 1 / 1;
  border-radius: 6px;
  background: rgba(169, 180, 198, 0.14);
  border: 1px solid rgba(169, 180, 198, 0.1);
}

.page-about .about-dots__cell--hot {
  background: var(--maple);
  border-color: var(--maple);
  box-shadow: 0 0 12px rgba(230, 57, 70, 0.36);
}

.page-about .about-reach__metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  border-top: 1px dashed var(--about-line);
  padding-top: 20px;
}

.page-about .about-reach__metrics li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .about-reach__mnum {
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-reach__mlabel {
  font-size: var(--fs-14);
  color: var(--mist);
  text-align: right;
  line-height: 1.6;
}

/* ---------- 准则 ---------- */
.page-about .about-rules__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-rule {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  padding: 24px 22px 24px 22px;
  overflow: hidden;
}

.page-about .about-rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--about-line-strong);
}

.page-about .about-rule:nth-child(1)::before { background: var(--maple); }
.page-about .about-rule:nth-child(2)::before { background: var(--gold); }
.page-about .about-rule:nth-child(3)::before { background: var(--aurora); }
.page-about .about-rule:nth-child(4)::before { background: var(--cyan); }
.page-about .about-rule:nth-child(5)::before { background: var(--aurora-deep); }

.page-about .about-rule__num {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .about-rule h3 {
  margin: 0 0 8px;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--paper);
  line-height: 1.45;
}

.page-about .about-rule p {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--mist);
  line-height: 1.78;
}

/* ---------- 收束 ---------- */
.page-about .about-next__box {
  position: relative;
  border-radius: var(--r-lg);
  padding: clamp(28px, 5vw, 56px);
  background:
    linear-gradient(135deg, rgba(230, 57, 70, 0.14), rgba(242, 179, 75, 0.08) 42%, rgba(47, 224, 166, 0.14));
  border: 1px solid var(--about-line-strong);
  overflow: hidden;
}

.page-about .about-next__box::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -110px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 224, 166, 0.26), transparent 68%);
  pointer-events: none;
}

.page-about .about-next__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--paper-2);
  font-size: var(--fs-16);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  position: relative;
  z-index: 1;
}

.page-about .about-next__note {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--about-line);
  font-size: var(--fs-12);
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--mist);
  max-width: 68ch;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-rule:nth-child(5) {
    grid-column: 1 / -1;
  }

  .page-about .about-tl {
    grid-template-columns: var(--about-tick) minmax(0, 1fr);
    gap: 4px 24px;
    padding-left: 0;
    padding-right: 4px;
  }

  .page-about .about-tl::before {
    display: none;
  }

  .page-about .about-tl__scale {
    justify-content: flex-start;
    padding-top: 4px;
    position: relative;
  }

  .page-about .about-tl__scale::after {
    content: "";
    position: absolute;
    left: 4px;
    top: 22px;
    bottom: -28px;
    width: 1px;
    background: linear-gradient(180deg, var(--about-line-strong), transparent);
  }

  .page-about .about-tl:last-child .about-tl__scale::after {
    display: none;
  }

  .page-about .about-dots {
    grid-template-columns: repeat(10, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-eco__grid {
    align-items: center;
  }

  .page-about .about-reach__grid {
    align-items: center;
  }

  .page-about .about-dots {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

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

  .page-about .about-rule:nth-child(5) {
    grid-column: auto;
  }

  .page-about .about-rule:nth-child(4) {
    grid-column: span 2;
  }
}

@media (min-width: 1240px) {
  .page-about .about-timeline__list {
    padding-left: 6px;
  }

  .page-about .about-tl {
    padding: 28px 0;
    gap: 6px 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl,
  .page-about .about-rule,
  .page-about .about-role {
    transition: none;
  }

  .page-about .about-hero::before,
  .page-about .about-next__box::after {
    animation: none;
  }
}
<<<END>>>