.page-about {
  --about-panel: var(--b10-abyss-800);
  --about-hair: var(--b10-line-500);
  background-color: var(--b10-abyss-950);
  color: var(--b10-paper-100);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--b10-maxw);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.38;
  filter: saturate(0.72) contrast(1.05);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(36, 64, 94, 0.42) 0 1px,
    transparent 1px 110px
  );
  opacity: 0.55;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    100deg,
    rgba(4, 16, 31, 0.97) 0%,
    rgba(4, 16, 31, 0.88) 50%,
    rgba(4, 16, 31, 0.5) 100%
  );
}

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

.page-about .about-crumbs {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--b10-mist-400);
}

.page-about .b10-crumbs__current {
  color: var(--b10-paper-100);
}

.page-about .about-eyebrow,
.page-about .b10-eyebrow {
  margin: 26px 0 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--b10-cyan-400);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  max-width: 16em;
  font-size: clamp(32px, 7.4vw, 72px);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title strong {
  font-weight: 700;
  color: var(--b10-gold-300);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0 0 28px;
  font-size: 16px;
  color: var(--b10-mist-400);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 44px;
}

.page-about .b10-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--about-hair);
  border-radius: 0;
  font-size: 15px;
  letter-spacing: 0.02em;
  transition: background-color 0.26s var(--b10-ease),
    border-color 0.26s var(--b10-ease), color 0.26s var(--b10-ease);
}

.page-about .b10-btn--primary {
  background-color: var(--b10-gold-500);
  border-color: var(--b10-gold-500);
  color: var(--b10-abyss-950);
  font-weight: 600;
}

.page-about .b10-btn--primary:hover,
.page-about .b10-btn--primary:focus-visible {
  background-color: var(--b10-gold-300);
  border-color: var(--b10-gold-300);
}

.page-about .b10-btn--ghost {
  background-color: transparent;
  color: var(--b10-paper-100);
}

.page-about .b10-btn--ghost:hover,
.page-about .b10-btn--ghost:focus-visible {
  border-color: var(--b10-cyan-400);
  color: var(--b10-cyan-400);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background-color: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-stat {
  background-color: rgba(10, 31, 53, 0.92);
  padding: 16px 16px 18px;
}

.page-about .about-stat dt {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--b10-mist-400);
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-stat__num {
  font-family: var(--b10-font-mono);
  font-size: 28px;
  font-weight: 500;
  line-height: 1;
  color: var(--b10-paper-100);
  letter-spacing: -0.02em;
}

.page-about .about-stat__unit {
  font-size: 12px;
  color: var(--b10-cyan-400);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 64px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-head {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
  margin-bottom: 24px;
}

.page-about .about-head__num {
  font-family: var(--b10-font-mono);
  font-size: clamp(44px, 9vw, 92px);
  font-weight: 200;
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: var(--b10-trench-600);
}

.page-about .about-head__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-head__text .b10-eyebrow {
  margin: 0;
}

.page-about .about-head__title {
  margin: 8px 0 0;
  font-size: clamp(22px, 3.6vw, 38px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-lede {
  max-width: 40em;
  margin: 0 0 36px;
  font-size: 16px;
  color: var(--b10-mist-400);
}

.page-about .about-figure {
  margin: 40px 0 0;
}

.page-about .about-figure img {
  width: 100%;
  border: 1px solid var(--about-hair);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--b10-mist-400);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 1px;
  background-color: var(--about-hair);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 34px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  z-index: 1;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--b10-trench-600);
  background-color: var(--b10-abyss-950);
}

.page-about .about-tl__item.is-current::before {
  background-color: var(--b10-gold-500);
  border-color: var(--b10-gold-300);
  box-shadow: 0 0 0 6px rgba(245, 130, 43, 0.16);
}

.page-about .about-tl__card {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 22px;
  background-color: var(--about-panel);
  border: 1px solid var(--about-hair);
}

.page-about .about-tl__item.is-current .about-tl__card {
  border-left: 2px solid var(--b10-gold-500);
}

.page-about .about-tl__year {
  position: absolute;
  right: 4px;
  top: -12px;
  font-size: clamp(56px, 13vw, 92px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--b10-paper-100);
  opacity: 0.1;
  pointer-events: none;
}

.page-about .about-tl__tag {
  position: relative;
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-tl__no {
  font-family: var(--b10-font-mono);
  color: var(--b10-cyan-400);
}

.page-about .about-tl__cat {
  color: var(--b10-mist-400);
}

.page-about .about-tl__cat::before {
  content: "/";
  margin-right: 8px;
  color: var(--about-hair);
}

.page-about .about-tl__title {
  position: relative;
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.35;
}

.page-about .about-tl__text {
  position: relative;
  margin: 0;
  font-size: 15px;
  color: var(--b10-mist-400);
}

/* ---------- 档案室 ---------- */
.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .about-filter-btn {
  appearance: none;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid var(--about-hair);
  border-radius: 0;
  background-color: transparent;
  color: var(--b10-mist-400);
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.26s var(--b10-ease),
    border-color 0.26s var(--b10-ease), background-color 0.26s var(--b10-ease);
}

.page-about .about-filter-btn:hover,
.page-about .about-filter-btn:focus-visible {
  color: var(--b10-paper-100);
  border-color: var(--b10-cyan-400);
}

.page-about .about-filter-btn[aria-pressed="true"] {
  background-color: var(--b10-cyan-400);
  border-color: var(--b10-cyan-400);
  color: var(--b10-abyss-950);
  font-weight: 600;
}

.page-about .about-archive__count {
  margin-left: auto;
  font-family: var(--b10-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--b10-mist-400);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-file {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 180px;
  padding: 18px;
  background-color: var(--about-panel);
  border: 1px solid var(--about-hair);
  transition: border-color 0.26s var(--b10-ease),
    background-color 0.26s var(--b10-ease);
}

.page-about .about-file:hover {
  border-color: var(--b10-cyan-400);
  background-color: var(--b10-trench-600);
}

.page-about .about-file__label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-file__no {
  font-family: var(--b10-font-mono);
  color: var(--b10-cyan-400);
}

.page-about .about-file__cat {
  color: var(--b10-mist-400);
}

.page-about .about-file__cat::before {
  content: "/";
  margin-right: 8px;
  color: var(--about-hair);
}

.page-about .about-file__title {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.35;
}

.page-about .about-file__text {
  margin: 0;
  font-size: 14px;
  color: var(--b10-mist-400);
}

.page-about .about-file__meta {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-hair);
  font-family: var(--b10-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--b10-mist-400);
  transition: color 0.26s var(--b10-ease);
}

.page-about .about-file:hover .about-file__meta {
  color: var(--b10-gold-300);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 32px;
}

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

.page-about .about-team__intro {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--b10-mist-400);
}

.page-about .about-team__row {
  padding: 16px 0 18px;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-team__name {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
}

.page-about .about-team__count {
  font-size: 13px;
  color: var(--b10-cyan-400);
  white-space: nowrap;
}

.page-about .about-team__desc {
  margin: 6px 0 12px;
  font-size: 14px;
  color: var(--b10-mist-400);
}

.page-about .about-bar {
  position: relative;
  height: 6px;
  background-color: var(--b10-trench-600);
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background-color: var(--b10-cyan-400);
}

.page-about .about-team__row--a .about-bar__fill {
  background-color: var(--b10-gold-500);
}

/* ---------- 服务体系 ---------- */
.page-about .about-service__diptych {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background-color: var(--about-hair);
  border: 1px solid var(--about-hair);
  margin-bottom: 36px;
}

.page-about .about-service__cell {
  padding: 24px 20px 26px;
  background-color: var(--about-panel);
}

.page-about .about-service__cell--before {
  background-color: rgba(232, 92, 92, 0.08);
}

.page-about .about-service__cell--after {
  background-color: rgba(62, 213, 152, 0.1);
}

.page-about .about-service__cap {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--b10-mist-400);
}

.page-about .about-service__big {
  margin: 10px 0 6px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-service__num {
  font-family: var(--b10-font-mono);
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .about-service__cell--before .about-service__num {
  color: var(--b10-coral-500);
}

.page-about .about-service__cell--after .about-service__num {
  color: var(--b10-mint-400);
}

.page-about .about-service__unit {
  font-size: 13px;
  color: var(--b10-mist-400);
}

.page-about .about-service__note {
  margin: 0;
  font-size: 14px;
  color: var(--b10-mist-400);
}

.page-about .about-steps {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps__item {
  padding: 18px;
  border: 1px solid var(--about-hair);
  background-color: transparent;
}

.page-about .about-steps__no {
  font-family: var(--b10-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--b10-gold-500);
}

.page-about .about-steps__title {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 500;
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 14px;
  color: var(--b10-mist-400);
}

.page-about .about-service__facts {
  display: grid;
  gap: 1px;
  background-color: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background-color: var(--b10-abyss-950);
}

.page-about .about-fact__num {
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--b10-paper-100);
}

.page-about .about-fact__label {
  font-size: 13px;
  color: var(--b10-mist-400);
}

/* ---------- 合作与资质 ---------- */
.page-about .about-network__lead {
  max-width: 40em;
  margin: 0 0 32px;
  font-size: 16px;
  color: var(--b10-mist-400);
}

.page-about .about-network__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-node {
  padding: 20px 18px 22px;
  border: 1px solid var(--about-hair);
  background-color: var(--about-panel);
}

.page-about .about-node--seal {
  border-color: rgba(245, 130, 43, 0.5);
  background-color: rgba(245, 130, 43, 0.08);
}

.page-about .about-node__cap {
  margin: 0 0 10px;
  font-family: var(--b10-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--b10-cyan-400);
}

.page-about .about-node--seal .about-node__cap {
  color: var(--b10-gold-300);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.35;
}

.page-about .about-node__text {
  margin: 0;
  font-size: 14px;
  color: var(--b10-mist-400);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: 64px 0 80px;
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-cta__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  border: 1px solid var(--about-hair);
  background-color: var(--about-panel);
  transition: border-color 0.26s var(--b10-ease),
    background-color 0.26s var(--b10-ease), transform 0.26s var(--b10-ease);
}

.page-about .about-cta__card:hover,
.page-about .about-cta__card:focus-visible {
  border-color: var(--b10-gold-500);
  background-color: var(--b10-trench-600);
  transform: translateY(-3px);
}

.page-about .about-cta__cap {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--b10-cyan-400);
}

.page-about .about-cta__title {
  font-size: 16px;
  line-height: 1.5;
  color: var(--b10-paper-100);
}

.page-about .about-cta__arrow {
  margin-top: 4px;
  font-size: 18px;
  color: var(--b10-gold-500);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-wrap {
    padding-left: 40px;
    padding-right: 40px;
  }

  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero__title {
    max-width: 14em;
  }

  .page-about .about-section {
    padding: 104px 0;
  }

  .page-about .about-head {
    gap: 24px;
    margin-bottom: 32px;
  }

  .page-about .about-team {
    grid-template-columns: 1fr 1.05fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-service__diptych {
    grid-template-columns: 1fr 1fr;
  }

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

  .page-about .about-cta {
    padding: 96px 0 112px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-archive__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-timeline {
    gap: 4px;
    margin-top: 12px;
  }

  .page-about .about-timeline::before {
    left: 50%;
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 72px;
    padding-left: 0;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .page-about .about-tl__item::before {
    left: 50%;
    margin-left: -8px;
    top: 36px;
  }

  .page-about .about-tl__item:nth-child(odd) .about-tl__card {
    grid-column: 1;
  }

  .page-about .about-tl__item:nth-child(even) .about-tl__card {
    grid-column: 2;
  }

  .page-about .about-tl__item:nth-child(odd) {
    text-align: right;
  }

  .page-about .about-tl__item:nth-child(odd) .about-tl__tag {
    justify-content: flex-end;
  }

  .page-about .about-tl__card {
    padding: 24px 24px 26px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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