.page-about {
  --about-line: rgba(140, 151, 168, .28);
  --about-line-soft: rgba(140, 151, 168, .16);
  --about-ink: #0A0F18;
  --about-ink-soft: #3D4658;
  --about-ink-faint: #5C6675;
  display: block;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  margin-left: calc(-1 * var(--rail-side-w));
  padding: 28px 0 46px;
  padding-left: var(--rail-side-w);
  background:
    radial-gradient(circle at 84% 6%, rgba(0, 194, 199, .18), transparent 44%),
    radial-gradient(circle at 8% 96%, rgba(30, 75, 143, .32), transparent 52%),
    linear-gradient(158deg, var(--deep) 0%, var(--night) 62%, #091524 100%);
  color: #FFFFFF;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 151, 168, .085) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 151, 168, .085) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(circle at 78% 24%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 78% 24%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

.page-about .about-hero .breadcrumbs {
  color: rgba(244, 247, 251, .58);
  font-size: 13px;
  letter-spacing: .02em;
}

.page-about .about-hero .breadcrumbs a {
  color: rgba(0, 194, 199, .92);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover {
  text-decoration: underline;
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
  margin-top: 16px;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(29px, 5vw, 50px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: #FFFFFF;
  max-width: 22em;
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 40em;
  color: rgba(244, 247, 251, .8);
  font-size: 16.5px;
  line-height: 1.78;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(140, 151, 168, .3);
}

.page-about .about-hero__metaItem {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__metaKey {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(244, 247, 251, .55);
}

.page-about .about-hero__metaVal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-hero__media {
  position: relative;
  padding: 10px;
  border: 1px solid rgba(140, 151, 168, .3);
  background: rgba(18, 41, 74, .48);
  backdrop-filter: blur(4px);
  border-radius: 2px;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1px;
  filter: saturate(.86) contrast(1.04);
}

/* ============ 档案室自述 ============ */
.page-about .about-statement {
  background: linear-gradient(180deg, var(--paper) 0%, var(--mist) 100%);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-statement__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-quote {
  margin: 18px 0 22px;
  padding: 2px 0 2px 20px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-edit);
  font-weight: 600;
  font-size: clamp(19px, 2.5vw, 26px);
  line-height: 1.62;
  color: var(--deep);
  letter-spacing: .01em;
}

.page-about .about-statement__text p {
  margin: 0 0 1.15em;
  color: var(--about-ink-soft);
  font-size: 16.5px;
  line-height: 1.8;
  max-width: 38em;
}

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

.page-about .about-statement__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  border-radius: 2px;
}

.page-about .about-statement__figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-ink-faint);
}

/* ============ 阶段刻度带 ============ */
.page-about .about-phases {
  position: relative;
  margin-left: calc(-1 * var(--rail-side-w));
  padding: 48px 0 52px;
  padding-left: var(--rail-side-w);
  background: var(--deep);
  color: #FFFFFF;
  overflow: hidden;
}

.page-about .about-phases__bg {
  position: absolute;
  inset: 0;
}

.page-about .about-phases__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
  opacity: .42;
}

.page-about .about-phases__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11, 27, 51, .96) 0%, rgba(11, 27, 51, .78) 46%, rgba(11, 27, 51, .9) 100%);
}

.page-about .about-phases__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-phases .eyebrow {
  color: var(--cyan);
}

.page-about .about-phases .section-title {
  color: #FFFFFF;
  max-width: 26em;
}

.page-about .about-phases__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(140, 151, 168, .26);
  border: 1px solid rgba(140, 151, 168, .26);
}

.page-about .about-phase {
  position: relative;
  padding: 22px 20px 24px;
  background: rgba(11, 27, 51, .76);
  backdrop-filter: blur(6px);
  transition: background .24s var(--ease);
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 3px;
  background: var(--cyan);
  opacity: .85;
}

.page-about .about-phase:hover {
  background: rgba(18, 41, 74, .92);
}

.page-about .about-phase__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
  margin-top: 6px;
}

.page-about .about-phase__name {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .about-phase__goal {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 247, 251, .74);
}

/* ============ 团队构成 ============ */
.page-about .about-team__head {
  max-width: 46em;
}

.page-about .about-team__head .lede {
  margin-top: 14px;
  color: var(--about-ink-soft);
  font-size: 16.5px;
  line-height: 1.8;
}

.page-about .about-team__visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 32px;
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  border-radius: 2px;
}

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-ink-faint);
}

.page-about .about-team__chartWrap {
  padding: 20px 18px 18px;
  background: var(--paper);
  border: 1px solid var(--about-line-soft);
  border-radius: 2px;
}

.page-about .about-team__chartTitle {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -.01em;
  color: var(--about-ink);
}

.page-about .about-team__chart {
  display: block;
  width: 100%;
  height: auto;
  margin: 6px 0 10px;
}

.page-about .about-chart__tracks rect {
  fill: rgba(140, 151, 168, .16);
}

.page-about .about-chart__bar--a { fill: var(--cyan); }
.page-about .about-chart__bar--b { fill: var(--green); }
.page-about .about-chart__bar--c { fill: var(--orbit); }
.page-about .about-chart__bar--d { fill: var(--metal); }

.page-about .about-chart__labels text {
  fill: var(--about-ink);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-chart__values text {
  fill: var(--about-ink-soft);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .02em;
}

.page-about .about-team__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-team-card {
  position: relative;
  padding: 20px 20px 18px;
  background: var(--mist);
  border: 1px solid var(--about-line-soft);
  border-top: 3px solid var(--orbit);
  border-radius: 2px;
  transition: border-color .24s var(--ease), background .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  background: var(--paper);
  border-color: var(--about-line);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-team-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-team-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team-card__head h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--about-ink);
}

.page-about .about-team-card__count {
  font-size: 15px;
  color: var(--orbit);
  white-space: nowrap;
}

.page-about .about-team-card__duty {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-faint);
}

.page-about .about-team-card__detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .28s var(--ease), opacity .24s var(--ease);
}

.page-about .about-team-card:hover .about-team-card__detail,
.page-about .about-team-card:focus-within .about-team-card__detail {
  max-height: 240px;
  opacity: 1;
}

.page-about .about-team-card__detail ul {
  margin: 14px 0 0;
  padding: 12px 0 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-team-card__detail li {
  position: relative;
  padding: 0 0 8px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-team-card__detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .about-team-card__toggle {
  display: inline-block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--metal);
  border-bottom: 1px dashed var(--about-line);
}

/* ============ 归档方法 ============ */
.page-about .about-method {
  background: var(--mist);
  border-top: 1px solid var(--about-line-soft);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-method__head {
  max-width: 44em;
}

.page-about .about-method__head .lede {
  margin-top: 14px;
  color: var(--about-ink-soft);
  font-size: 16.5px;
  line-height: 1.8;
}

.page-about .about-method__bar {
  margin: 26px 0 0;
}

.page-about .about-method__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 20px 22px;
  background: var(--paper);
  border: 1px solid var(--about-line-soft);
  border-left: 3px solid rgba(140, 151, 168, .5);
  transition: border-color .24s var(--ease), background .24s var(--ease), opacity .24s var(--ease);
}

.page-about .about-step.is-muted {
  opacity: .38;
}

.page-about .about-step:hover {
  border-left-color: var(--cyan);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--metal);
}

.page-about .about-step__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--about-ink);
}

.page-about .about-step__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 52em;
}

/* ============ 协作生态与资质 ============ */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-eco__block {
  padding: 26px 22px 28px;
  background: var(--paper);
  border: 1px solid var(--about-line-soft);
  border-radius: 2px;
}

.page-about .about-eco__block--dark {
  background:
    radial-gradient(circle at 90% 10%, rgba(0, 194, 199, .16), transparent 48%),
    linear-gradient(160deg, var(--deep) 0%, var(--night) 100%);
  border-color: rgba(140, 151, 168, .3);
  color: #FFFFFF;
}

.page-about .about-eco__block .eyebrow {
  margin-bottom: 12px;
}

.page-about .about-eco__block--dark .eyebrow {
  color: var(--cyan);
}

.page-about .about-eco__block h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--about-ink);
}

.page-about .about-eco__block--dark h3 {
  color: #FFFFFF;
}

.page-about .about-eco__block p {
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-eco__block--dark p {
  color: rgba(244, 247, 251, .78);
}

.page-about .about-eco__facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid rgba(140, 151, 168, .3);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-eco__facts li {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 247, 251, .66);
}

.page-about .about-eco__facts .data {
  color: var(--cyan);
  font-size: 15px;
  margin-right: 8px;
  white-space: nowrap;
}

.page-about .about-cert-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-cert-item {
  padding: 14px 16px;
  background: var(--paper);
}

.page-about .about-cert-item strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -.005em;
  color: var(--about-ink);
}

.page-about .about-cert-item span {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-ink-faint);
}

/* ============ 站点边界 ============ */
.page-about .about-boundary {
  background: var(--paper);
}

.page-about .about-boundary__lede {
  margin: 14px 0 22px;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-boundary__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-boundary__list li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-boundary__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-routes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-route {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid var(--about-line);
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: var(--deep);
  background: var(--mist);
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-route::after {
  content: "→";
  margin-left: 10px;
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .about-route:hover {
  border-color: var(--cyan);
  background: #FFFFFF;
}

.page-about .about-route:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 40px 0 58px;
    padding-left: var(--rail-side-w);
  }

  .page-about .about-team__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-eco__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

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

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
  }

  .page-about .about-statement__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .about-team__visual {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 34px;
    align-items: stretch;
  }

  .page-about .about-team__cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-phases__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 22px;
  }

  .page-about .about-step {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 22px;
    padding: 24px 26px 26px;
    align-items: start;
  }

  .page-about .about-step__num {
    font-size: 32px;
    padding-top: 2px;
  }

  .page-about .about-phases {
    padding-top: 62px;
    padding-bottom: 66px;
  }
}

@media (hover: none) {
  .page-about .about-team-card__detail {
    max-height: none;
    opacity: 1;
  }

  .page-about .about-team-card__toggle {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase,
  .page-about .about-team-card,
  .page-about .about-route {
    transition: none;
  }

  .page-about .about-team-card:hover,
  .page-about .about-team-card:focus-within {
    transform: none;
  }
}