.page-about {
  --about-rail: 148px;
  --about-line: #C9D2DB;
  --about-ink-soft: #3F566D;
  display: block;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(201, 210, 219, .22) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(180deg, rgba(201, 210, 219, .22) 1px, transparent 1px) 0 0 / 64px 64px,
    var(--paper);
}

/* ---------------- 面包屑 ---------------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 28px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: .05em;
  color: var(--grey);
}
.page-about .breadcrumb a {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.page-about .breadcrumb a:hover {
  border-bottom-color: var(--indigo);
}
.page-about .breadcrumb span[aria-current] {
  color: var(--ink);
}

/* ---------------- 首屏 ---------------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
  padding: clamp(36px, 5vw, 72px) 0 clamp(48px, 6vw, 88px);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--indigo);
  margin: 0 0 18px;
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-h1);
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 0 0 24px;
  color: var(--ink);
  text-wrap: balance;
}
.page-about .about-hero__lede {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--about-ink-soft);
  max-width: 62ch;
  margin: 0 0 32px;
}
.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 18px 24px;
  border-top: 1px solid var(--about-line);
}
.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--indigo);
}
.page-about .about-hero__num.is-accent {
  color: var(--pom);
}
.page-about .about-hero__facts li span:last-child {
  font-size: var(--fs-small);
  color: var(--grey);
  letter-spacing: .04em;
}

.page-about .about-hero__rail {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--about-line);
  margin-top: 10px;
}
.page-about .about-hero__tick {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 14px;
  align-items: center;
  padding: 16px 0 16px 22px;
  position: relative;
  text-decoration: none;
  color: var(--grey);
  font-style: normal;
  font-size: var(--fs-small);
  transition: color var(--dur) var(--ease);
}
.page-about .about-hero__tick::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-hero__tick i {
  font-style: normal;
  line-height: 1.5;
}
.page-about .about-hero__tick span {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--indigo);
  letter-spacing: -.01em;
}
.page-about .about-hero__tick:hover {
  color: var(--ink);
}
.page-about .about-hero__tick:hover::before {
  background: var(--pom);
  border-color: var(--pom);
}

/* ---------------- 通用章节带 ---------------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(56px, 7vw, 96px) 0;
  border-bottom: 1px solid var(--about-line);
  position: relative;
}
.page-about .about-band:last-of-type {
  border-bottom: 0;
}
.page-about .about-band__side {
  position: sticky;
  top: 104px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 6px;
}
.page-about .about-band__year {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--indigo);
}
.page-about .about-band__label {
  font-size: var(--fs-small);
  letter-spacing: .08em;
  color: var(--grey);
}
.page-about .about-band__side::after {
  content: "";
  width: 36px;
  height: 2px;
  margin-top: 12px;
  background: var(--sand);
}

/* 深色带 */
.page-about .about-band--dark {
  background: var(--ink);
  color: #DDE4EC;
  margin-inline: calc(var(--pad) * -1);
  padding-inline: var(--pad);
  border-bottom-color: rgba(255, 255, 255, .1);
}
.page-about .about-band--dark .chapter__title {
  color: #FFFFFF;
}
.page-about .about-band--dark .chapter__num {
  color: var(--sand);
}
.page-about .about-band--dark .about-band__year {
  color: var(--sand);
}
.page-about .about-band--dark .about-band__label {
  color: #91A5B8;
}
.page-about .about-band--dark .about-band__side::after {
  background: var(--pom);
}

/* 温纸底带 */
.page-about .about-band--warm {
  background: var(--warm);
  margin-inline: calc(var(--pad) * -1);
  padding-inline: var(--pad);
}

/* 正文段 */
.page-about .about-prose p {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--about-ink-soft);
  max-width: 68ch;
  margin: 0 0 1.1em;
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------------- 方法三步 ---------------- */
.page-about .about-steps__link {
  margin: 8px 0 0;
}
.page-about .about-steps__link svg {
  display: block;
  width: 100%;
  height: 24px;
}
.page-about .about-steps {
  list-style: none;
  margin: 0 0 44px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-step {
  background: #FFFFFF;
  padding: 26px 24px 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background var(--dur) var(--ease);
}
.page-about .about-step:hover {
  background: #FDFCFA;
}
.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--sand);
  background: var(--ink);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  align-self: flex-start;
}
.page-about .about-step__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--ink);
}
.page-about .about-step p {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
  margin: 0;
}

/* ---------------- 图像 ---------------- */
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  background: var(--warm);
}
.page-about .about-figure--method {
  max-width: 720px;
}
.page-about .about-figure--band {
  margin-bottom: 40px;
}
.page-about .about-band--dark .about-figure img {
  border-color: rgba(255, 255, 255, .14);
}
.page-about .about-band--dark .figure__caption {
  color: #91A5B8;
}
.page-about .figure__caption {
  margin-top: 10px;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--grey);
}

/* ---------------- 时间轴 ---------------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0 6px;
  padding: 0;
  border-left: 1px solid rgba(255, 255, 255, .16);
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 26px;
  padding: 24px 0 24px 28px;
  position: relative;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 34px;
  width: 9px;
  height: 9px;
  background: var(--indigo);
  transition: background var(--dur) var(--ease);
}
.page-about .about-timeline__item.is-pivot::before {
  background: var(--pom);
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--sand);
  padding-top: 2px;
}
.page-about .about-timeline__body h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: #FFFFFF;
}
.page-about .about-timeline__body p {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.8;
  margin: 0;
  color: #A9BACC;
  max-width: 60ch;
}

/* ---------------- 团队 ---------------- */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-team__card {
  position: relative;
  background: var(--warm);
  padding: 24px 22px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-team__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--indigo);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.page-about .about-team__card:hover {
  background: #FFFFFF;
  transform: translateY(-2px);
}
.page-about .about-team__card:hover::before {
  opacity: 1;
}
.page-about .about-team__no {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--grey);
}
.page-about .about-team__name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--ink);
}
.page-about .about-team__card p {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.75;
  margin: 0;
  color: var(--about-ink-soft);
}

/* ---------------- 资料室 ---------------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.page-about .about-archive__text p {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--about-ink-soft);
  max-width: 62ch;
  margin: 0 0 1.1em;
}
.page-about .about-archive__text p:last-child {
  margin-bottom: 0;
}

/* ---------------- 服务范围 ---------------- */
.page-about .about-reach__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-reach__item {
  display: grid;
  grid-template-columns: 156px minmax(0, 1fr);
  gap: 24px;
  background: var(--paper);
  padding: 20px 24px;
}
.page-about .about-reach__item dt {
  font-family: var(--font-display);
  font-size: .9375rem;
  font-weight: 700;
  color: var(--indigo);
  letter-spacing: .01em;
}
.page-about .about-reach__item dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------------- 结尾行动区 ---------------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin: clamp(48px, 6vw, 80px) calc(var(--pad) * -1) 0;
  padding: clamp(48px, 6vw, 72px) var(--pad) clamp(56px, 6vw, 80px);
  background: var(--indigo);
  color: #FFFFFF;
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, .07) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(180deg, rgba(255, 255, 255, .07) 1px, transparent 1px) 0 0 / 44px 44px;
  pointer-events: none;
}
.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
}
.page-about .about-cta__eyebrow {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--sand);
  margin: 0 0 14px;
}
.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-h2);
  line-height: 1.24;
  letter-spacing: -.02em;
  margin: 0 0 16px;
  color: #FFFFFF;
}
.page-about .about-cta__text {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: #D3DEEC;
  margin: 0 0 28px;
  max-width: 62ch;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 960px) {
  .page-about {
    --about-rail: auto;
  }
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .page-about .about-hero__rail {
    flex-direction: row;
    flex-wrap: wrap;
    border-left: 0;
    border-top: 1px solid var(--about-line);
    padding-top: 12px;
    margin-top: 0;
    gap: 8px 20px;
  }
  .page-about .about-hero__tick {
    grid-template-columns: auto auto;
    gap: 8px;
    padding: 8px 0;
  }
  .page-about .about-hero__tick::before {
    display: none;
  }
  .page-about .about-band {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }
  .page-about .about-band__side {
    position: static;
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding-top: 0;
  }
  .page-about .about-band__side::after {
    display: none;
  }
  .page-about .about-steps {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-steps__link {
    display: none;
  }
  .page-about .about-archive {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-figure--method {
    max-width: 100%;
  }
}

@media (max-width: 640px) {
  .page-about .about-timeline__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding-left: 22px;
  }
  .page-about .about-timeline__item::before {
    top: 28px;
  }
  .page-about .about-reach__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 18px 18px;
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}