.page-about {
  --about-rail-w: 108px;
  --about-glow: radial-gradient(circle at 82% 12%, rgba(255, 75, 31, .16), transparent 58%);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: 1.75rem;
  font-family: var(--mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--muted);
}

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

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

.page-about .crumb-sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 2.25rem 0 3rem;
  background: var(--about-glow), var(--ink);
}

.page-about .hero-grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .hero-main h1 {
  margin: .75rem 0 1.25rem;
  font-size: clamp(2.1rem, 8vw, 3.75rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--fog);
}

.page-about .lede {
  max-width: 34em;
  color: var(--muted);
}

.page-about .hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin-top: 1.75rem;
}

.page-about .hero-cta-link {
  color: var(--cyan);
  font-size: var(--fs-16);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

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

.page-about .hero-facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  padding: .95rem 1.1rem;
  background: var(--panel);
}

.page-about .hero-fact b {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: var(--fs-20);
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .hero-fact span {
  font-size: var(--fs-12);
  color: var(--muted);
}

.page-about .hero-side .note {
  margin-top: 1rem;
}

/* ---------- 四条内容线 ---------- */
.page-about .about-lines {
  padding: 3rem 0;
}

.page-about .lines-shell {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.page-about .lines-visual {
  padding: 1.25rem 1.1rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-about .line-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .lines-visual-cap {
  margin: .75rem 0 0;
  font-size: var(--fs-12);
  color: var(--dim);
  line-height: 1.7;
}

.page-about .lines-list {
  display: grid;
  gap: .25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .line-item {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr) 1.25rem;
  align-items: start;
  gap: .9rem;
  min-height: 44px;
  padding: 1rem .5rem 1rem .75rem;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--line);
  color: var(--fog);
  text-decoration: none;
  transition: background-color .2s var(--ease), transform .2s var(--ease), border-left-color .2s var(--ease);
}

.page-about .line-num {
  font-family: var(--mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--cyan);
  padding-top: .2rem;
}

.page-about .line-title {
  display: block;
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -.01em;
  margin-bottom: .35rem;
}

.page-about .line-desc {
  display: block;
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .line-go {
  color: var(--dim);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}

.page-about .line-item:hover,
.page-about .line-item:focus-visible {
  background: var(--signal-soft);
  border-left-color: var(--signal);
  transform: translateX(2px);
}

.page-about .line-item:hover .line-go,
.page-about .line-item:focus-visible .line-go {
  opacity: 1;
  transform: translateX(0);
  color: var(--signal);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .timeline-shell {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .anchor-rail {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  position: relative;
  padding-left: 1.5rem;
}

.page-about .anchor-rail::before {
  content: "";
  position: absolute;
  left: .35rem;
  top: .35rem;
  bottom: .35rem;
  width: 1px;
  background: var(--line);
}

.page-about .anchor-link {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--dim);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .anchor-link::before {
  content: "";
  position: absolute;
  left: -1.42rem;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .anchor-link:hover {
  color: var(--fog);
}

.page-about .anchor-link.is-active {
  color: var(--fog);
}

.page-about .anchor-link.is-active::before {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 4px var(--signal-soft);
}

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

.page-about .timeline-item {
  padding: 1.35rem 1.25rem 1.5rem;
  margin-bottom: .75rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  border-left: 3px solid var(--line);
  transition: border-left-color .25s var(--ease);
}

.page-about .timeline-item:hover {
  border-left-color: var(--signal);
}

.page-about .timeline-mark {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
  margin-bottom: .8rem;
}

.page-about .timeline-year {
  font-family: var(--mono);
  font-size: var(--fs-28);
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .timeline-item h3 {
  margin: 0 0 .55rem;
  font-size: var(--fs-20);
  color: var(--fog);
  letter-spacing: -.01em;
}

.page-about .timeline-item p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  padding: 3rem 0;
}

.page-about .crew-shell {
  display: grid;
  gap: 1.75rem;
  margin-top: 2rem;
}

.page-about .crew-shot {
  margin: 0;
}

.page-about .crew-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--r);
  border: 1px solid var(--line);
}

.page-about .frame-cap {
  margin-top: .7rem;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--dim);
}

.page-about .crew-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .crew-card {
  padding: 1.4rem 1.2rem 1.5rem;
  background: var(--panel);
  transition: background-color .2s var(--ease);
}

.page-about .crew-card:hover {
  background: #17223a;
}

.page-about .crew-count {
  margin: 0 0 .3rem;
  font-family: var(--mono);
  font-size: var(--fs-56);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .crew-card h3 {
  margin: 0 0 .55rem;
  font-size: var(--fs-20);
  color: var(--fog);
}

.page-about .crew-card p {
  margin: 0 0 .9rem;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .crew-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crew-tags li {
  padding: .2rem .5rem;
  font-size: var(--fs-12);
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

/* ---------- 工作节奏 ---------- */
.page-about .about-rhythm {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
}

.page-about .rhythm-shell {
  display: grid;
  gap: 2rem;
}

.page-about .rhythm-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rhythm-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .4rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-when {
  font-family: var(--mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .rhythm-row h3 {
  margin: 0 0 .4rem;
  font-size: var(--fs-20);
  color: var(--fog);
}

.page-about .rhythm-row p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .rhythm-shot {
  margin: 0;
}

.page-about .rhythm-shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r);
  border: 1px solid var(--line);
}

.page-about .rhythm-foot {
  margin-top: 1.75rem;
}

/* ---------- 三件坚持 ---------- */
.page-about .about-tenets {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
}

.page-about .tenets {
  display: grid;
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .tenet {
  padding: 1.5rem 1.2rem;
  background: var(--panel);
}

.page-about .tenet-num {
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--signal);
  margin-bottom: .8rem;
}

.page-about .tenet h3 {
  margin: 0 0 .6rem;
  font-size: var(--fs-20);
  color: var(--fog);
  letter-spacing: -.01em;
}

.page-about .tenet p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .tenet-more {
  margin-top: 1.5rem;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tenet-more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .tenet-more a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: 0 0 3rem;
}

.page-about .close-shot {
  margin: 0 0 1.75rem;
}

.page-about .close-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
}

.page-about .close-copy h2 {
  margin: .6rem 0 .9rem;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--fog);
}

.page-about .close-copy p {
  max-width: 34em;
  margin: 0 0 1.5rem;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .line-item,
  .page-about .line-go,
  .page-about .anchor-link,
  .page-about .crew-card,
  .page-about .timeline-item {
    transition: none;
  }

  .page-about .line-item:hover,
  .page-about .line-item:focus-visible {
    transform: none;
  }

  .page-about .line-go {
    transform: none;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .rhythm-row {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
  }

  .page-about .crew-tags li {
    font-size: var(--fs-12);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 3rem 0 4.5rem;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .lines-shell {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .lines-visual {
    position: sticky;
    top: calc(var(--header-min) + 1.5rem);
  }

  .page-about .timeline-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .timeline-rail {
    position: sticky;
    top: calc(var(--header-min) + 1.5rem);
    align-self: start;
  }

  .page-about .crew-shell {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .crew-grid {
    grid-template-columns: 1.15fr .9fr 1.05fr;
  }

  .page-about .rhythm-shell {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 2.5rem;
    align-items: start;
  }

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

  .page-about .close-copy {
    max-width: 40rem;
  }
}

@media (min-width: 1180px) {
  .page-about .hero-main h1 {
    font-size: var(--fs-56);
  }

  .page-about .crew-count {
    font-size: var(--fs-88);
  }
}
<<<END>>>