.page-about {
  --ab-soft: rgba(36, 50, 79, .62);
  --ab-cyan-veil: rgba(51, 230, 255, .12);
  --ab-signal-veil: rgba(255, 210, 74, .09);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(88px, 14vw, 132px) 0 clamp(40px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, var(--ab-cyan-veil), transparent 62%),
    radial-gradient(90% 70% at 4% 100%, var(--ab-signal-veil), transparent 66%);
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-hero__lead .label {
  margin-bottom: 18px;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-title);
  font-size: clamp(2.1rem, 6.2vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stat {
  min-width: 118px;
}

.page-about .about-hero__stat dt {
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__num {
  font-family: var(--font-data);
  font-size: clamp(1.7rem, 4.6vw, 2.5rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--signal);
  line-height: 1;
}

.page-about .about-hero__unit {
  margin-left: 5px;
  font-size: .82rem;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 8px 8px 0 rgba(36, 50, 79, .38);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06);
}

.page-about .about-hero__figure figcaption {
  position: relative;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: .8rem;
  line-height: 1.6;
  color: var(--mist);
  background: var(--panel);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 34px;
  height: 34px;
  border-top: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
  pointer-events: none;
}

/* ---------- 章节导航 ---------- */
.page-about .about-nav {
  position: sticky;
  top: var(--header-h, 62px);
  z-index: 5;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 11, 24, .94);
  backdrop-filter: blur(10px);
}

.page-about .about-nav__list {
  display: flex;
  gap: 2px;
  margin: 0;
  padding-top: 0;
  padding-bottom: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-nav__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-nav__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 15px 14px;
  border-bottom: 2px solid transparent;
  font-size: .92rem;
  font-weight: 600;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-nav__list a:hover,
.page-about .about-nav__list a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

.page-about .about-nav__idx {
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--signal);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(46px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--ab-soft);
}

.page-about .about-section--last {
  border-bottom: 0;
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 40px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__num {
  font-family: var(--font-data);
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan-dim);
  letter-spacing: -.02em;
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-section__note {
  margin: 0;
  font-family: var(--font-data);
  font-size: .76rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-section__lead {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-split__body p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-split__body p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-split__link {
  margin-top: 22px;
}

/* ---------- 纸张叠层卡 ---------- */
.page-about .about-paper {
  position: relative;
}

.page-about .about-paper__layer {
  position: absolute;
  inset: 10px -6px -8px 12px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  opacity: .7;
}

.page-about .about-paper__card {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 18px 40px rgba(3, 7, 18, .55);
}

.page-about .about-paper__title {
  margin: 14px 0 16px;
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-paper__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-paper__list li {
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-paper__list span {
  display: block;
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 3px;
}

.page-about .about-paper__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: .82rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 26px;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(51, 230, 255, .05));
}

.page-about .about-node {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color .2s ease, background-color .2s ease;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px var(--ink);
}

.page-about .about-node[open] {
  border-color: var(--cyan-dim);
  background: var(--panel-2);
}

.page-about .about-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node summary:hover .about-node__title {
  color: var(--cyan);
}

.page-about .about-node__year {
  font-family: var(--font-data);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--signal);
}

.page-about .about-node__title {
  font-size: .98rem;
  font-weight: 600;
  color: var(--paper);
  transition: color .18s ease;
}

.page-about .about-node__hint {
  margin-left: auto;
  font-family: var(--font-data);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-node[open] .about-node__hint {
  color: var(--cyan);
}

.page-about .about-node__body {
  margin: 0 20px 20px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.page-about .about-node__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-team__card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-team__card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan-dim);
  background: var(--panel-2);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-data);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__role {
  margin: 10px 0 10px;
  font-family: var(--font-title);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--mist);
  transition: color .2s ease;
}

.page-about .about-team__card:hover .about-team__duty {
  color: var(--paper);
}

.page-about .about-rhythm {
  padding: clamp(20px, 3.4vw, 30px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(120deg, var(--panel) 0%, rgba(14, 23, 48, .4) 100%);
}

.page-about .about-rhythm__title {
  margin: 0 0 18px;
  font-family: var(--font-data);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-rhythm__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-rhythm__steps li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-rhythm__step {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: .7rem;
  color: var(--signal);
}

/* ---------- 校对 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) contrast(1.05);
}

.page-about .about-figure figcaption {
  padding: 11px 15px;
  border-top: 1px solid var(--line);
  font-size: .78rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-figure--review img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--map img {
  aspect-ratio: 10 / 7;
}

.page-about .about-checks {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-checks li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-checks li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-checks .tag {
  flex: 0 0 auto;
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
  margin-bottom: clamp(30px, 5vw, 48px);
}

.page-about .about-coverage__stats {
  display: grid;
  gap: 12px;
}

.page-about .about-coverage__stat {
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-coverage__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-coverage__pct {
  font-size: .55em;
  margin-left: 2px;
  color: var(--signal);
}

.page-about .about-coverage__cap {
  display: block;
  margin-top: 8px;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-eco {
  padding-top: clamp(22px, 3.6vw, 32px);
  border-top: 1px solid var(--line);
}

.page-about .about-eco__title {
  margin: 0 0 18px;
  font-family: var(--font-title);
  font-size: clamp(1.1rem, 2.6vw, 1.35rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-eco .filter-bar {
  margin-bottom: 20px;
}

.page-about .about-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-eco__item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .about-eco__item:hover {
  border-color: var(--cyan-dim);
  background: var(--panel-2);
}

.page-about .about-eco__item .tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 原则与积累 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(30px, 5vw, 46px);
}

.page-about .about-principle {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-principle__mark {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--cyan-dim);
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-principle__title {
  margin: 16px 0 10px;
  font-family: var(--font-title);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-principle p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-honors {
  padding: clamp(20px, 3.6vw, 30px);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(14, 23, 48, .95) 0%, rgba(7, 11, 24, .6) 100%);
  margin-bottom: clamp(30px, 5vw, 46px);
}

.page-about .about-honors__title {
  margin: 0 0 18px;
  font-family: var(--font-data);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-honors__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-honors__list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-honors__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-honors__num {
  flex: 0 0 auto;
  min-width: 42px;
  font-family: var(--font-data);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  padding: clamp(24px, 4vw, 36px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--signal);
  background:
    radial-gradient(90% 120% at 100% 0%, var(--ab-cyan-veil), transparent 60%),
    var(--panel);
}

.page-about .about-cta h3 {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: clamp(1.15rem, 2.8vw, 1.5rem);
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: stretch;
  }

  .page-about .about-coverage__stats {
    grid-template-columns: minmax(0, 1fr);
    align-content: start;
  }

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

  .page-about .about-rhythm__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 28px;
  }

  .page-about .about-honors__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 32px;
  }

  .page-about .about-honors__list li:nth-last-child(-n+2) {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .about-nav__list a {
    padding-left: 18px;
    padding-right: 18px;
  }

  .page-about .about-paper__card {
    padding: 30px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-team__card,
  .page-about .about-eco__item,
  .page-about .about-nav__list a,
  .page-about .about-node__title,
  .page-about .about-team__duty {
    transition: none;
  }

  .page-about .about-team__card:hover {
    transform: none;
  }
}