.page-about {
  --about-gap: clamp(48px, 6.5vw, 92px);
  --about-line: 112px;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .about-lead {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  min-height: min(78vh, 720px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  padding: clamp(48px, 8vw, 108px) 0 clamp(44px, 6vw, 76px);
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .48;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 14, 20, .62) 0%, rgba(11, 14, 20, .84) 58%, var(--ink-900) 100%),
    radial-gradient(120% 90% at 82% 12%, rgba(10, 132, 255, .22), transparent 62%);
  z-index: 1;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(28px, 5vw, 60px);
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  font-weight: 800;
  font-size: clamp(2.05rem, 6.2vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  max-width: 22ch;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0 0 34px;
  color: var(--text-dim);
  font-size: 1.02rem;
  line-height: 1.75;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(26px, 5vw, 68px);
  list-style: none;
  margin: 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-hero__lbl {
  font-size: .8rem;
  letter-spacing: .09em;
  color: var(--rock);
}

/* ---------- 时间轴 ---------- */

.page-about .tl {
  list-style: none;
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  column-gap: 44px;
  padding-bottom: 38px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  top: 22px;
  bottom: -4px;
  left: var(--about-line);
  width: 1px;
  background: var(--line);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  top: 11px;
  left: calc(var(--about-line) - 4.5px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item:last-child::before {
  display: none;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: .88rem;
  letter-spacing: .1em;
  color: var(--cyan);
  text-align: right;
  padding-top: 12px;
}

.page-about .tl__panel {
  border: 0;
  padding: 0;
  margin: 0;
}

.page-about .tl__summary {
  cursor: pointer;
  list-style: none;
  padding: 8px 0 0;
}

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

.page-about .tl__title {
  display: inline;
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
  transition: color var(--fast) var(--ease);
}

.page-about .tl__summary:hover .tl__title,
.page-about .tl__summary:focus-visible .tl__title {
  color: var(--cyan);
}

.page-about .tl__body {
  margin-top: 12px;
  max-width: 62ch;
}

.page-about .tl__body p {
  margin: 0;
  color: var(--text-dim);
  font-size: .96rem;
  line-height: 1.75;
}

/* ---------- 团队分工 ---------- */

.page-about .roles {
  margin-top: clamp(34px, 5vw, 56px);
  gap: 20px;
}

.page-about .role {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(22px, 2.8vw, 32px);
  transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease), background var(--fast) var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  border-color: var(--cyan);
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-about .role__index {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-about .role__title {
  margin: 0 0 12px;
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .role__text {
  margin: 0;
  color: var(--text-dim);
  font-size: .94rem;
  line-height: 1.72;
}

.page-about .role__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .role__tags li {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--rock);
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .role:hover .role__tags li {
  color: var(--text);
  border-color: var(--line-strong);
}

.page-about .team-figure {
  margin: clamp(34px, 5vw, 54px) 0 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .team-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--rock);
}

/* ---------- 栏目与版本 ---------- */

.page-about .maint {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: clamp(34px, 5vw, 56px);
}

.page-about .maint__col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .maint__aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .metric {
  background: var(--cream);
  color: var(--ink-900);
  border-radius: var(--radius);
  padding: 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-left: 3px solid var(--moss);
}

.page-about .metric__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: .01em;
  line-height: 1;
  color: var(--ink-900);
}

.page-about .metric__lbl {
  font-size: .84rem;
  letter-spacing: .04em;
  color: #4C5560;
}

/* ---------- 内容合作 ---------- */

.page-about .partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .partners__list {
  list-style: none;
  margin: 28px 0 30px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .partners__list li {
  position: relative;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: .95rem;
  line-height: 1.72;
}

.page-about .partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--moss);
  transform: rotate(45deg);
}

.page-about .partners__list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-weight: 700;
  font-size: .88rem;
  letter-spacing: .05em;
}

.page-about .partners__media {
  margin: 0;
}

.page-about .partners__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .partners__media figcaption {
  margin-top: 12px;
  font-size: .84rem;
  line-height: 1.6;
  color: var(--rock);
}

/* ---------- 日常节奏 ---------- */

.page-about .rhythm {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: clamp(34px, 5vw, 56px);
}

.page-about .rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .rhythm__list li {
  border-left: 2px solid var(--blue);
  padding-left: 22px;
}

.page-about .rhythm__step {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--blue);
  margin-bottom: 8px;
}

.page-about .rhythm__list h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .rhythm__list p {
  margin: 0;
  max-width: 58ch;
  color: var(--text-dim);
  font-size: .94rem;
  line-height: 1.72;
}

.page-about .rhythm__note {
  background: var(--cream);
  color: var(--ink-900);
  border-radius: var(--radius);
  padding: clamp(24px, 3vw, 34px);
  align-self: start;
}

.page-about .rhythm__note .eyebrow {
  color: var(--clay);
}

.page-about .rhythm__note h3 {
  margin: 12px 0 12px;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .rhythm__note p {
  margin: 0 0 18px;
  font-size: .94rem;
  line-height: 1.72;
  color: #4C5560;
}

.page-about .rhythm__note .link {
  color: var(--ink-900);
  font-weight: 600;
}

/* ---------- 延伸入口 ---------- */

.page-about .next {
  border-top: 1px solid var(--line);
  padding-top: clamp(30px, 4vw, 46px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .next__head .section-title {
  margin-top: 12px;
}

.page-about .next__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .next__link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--fast) var(--ease), background var(--fast) var(--ease), padding-left var(--fast) var(--ease);
}

.page-about .next__link:hover,
.page-about .next__link:focus-visible {
  border-color: var(--cyan);
  background: var(--ink-800);
  padding-left: 24px;
}

.page-about .next__num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--blue);
}

.page-about .next__label {
  font-size: .98rem;
  font-weight: 600;
}

/* ---------- 响应式 ---------- */

@media (max-width: 720px) {
  .page-about .about-hero {
    min-height: auto;
    padding: 40px 0 44px;
  }

  .page-about .about-hero__lead {
    font-size: .98rem;
  }

  .page-about .about-hero__stats {
    gap: 22px;
  }

  .page-about .tl__item {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 12px;
    padding-bottom: 30px;
  }

  .page-about .tl__item::before,
  .page-about .tl__item::after {
    display: none;
  }

  .page-about .tl__year {
    text-align: left;
    padding-top: 0;
    font-size: .8rem;
  }

  .page-about .tl__summary {
    padding-top: 0;
  }

  .page-about .role__text,
  .page-about .rhythm__list p,
  .page-about .partners__list li {
    font-size: .92rem;
  }
}

@media (min-width: 760px) {
  .page-about .next {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    align-items: end;
    gap: 48px;
  }

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

@media (min-width: 860px) {
  .page-about .role--a { grid-column: span 7; }
  .page-about .role--b { grid-column: span 5; }
  .page-about .role--c { grid-column: span 5; }
  .page-about .role--d { grid-column: span 7; }
}

@media (min-width: 900px) {
  .page-about .partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: 56px;
  }

  .page-about .rhythm {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 54px;
  }
}

@media (min-width: 980px) {
  .page-about .maint {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 54px;
  }
}
<<<END>>>