.page-about {
  --about-hair: rgba(201, 214, 223, 0.16);
  --about-dot: #081826;
  --about-gold-deep: #9a6c1c;
  background: var(--ink);
  color: var(--paper);
  line-height: 1.8;
  overflow-x: hidden;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumbs li {
  color: rgba(201, 214, 223, 0.75);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(201, 214, 223, 0.35);
}

.page-about .breadcrumbs a {
  color: rgba(201, 214, 223, 0.75);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--gold-bright);
  border-bottom-color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 52px;
  background:
    radial-gradient(120% 90% at 92% -10%, rgba(217, 164, 65, 0.18), transparent 58%),
    linear-gradient(180deg, rgba(27, 58, 92, 0.55), rgba(8, 24, 38, 0) 72%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 214, 223, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 214, 223, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(72% 64% at 72% 18%, #000 18%, transparent 76%);
  mask-image: radial-gradient(72% 64% at 72% 18%, #000 18%, transparent 76%);
  pointer-events: none;
}

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

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

.page-about .about-hero .eyebrow {
  margin: 0 0 4px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 12px 0 20px;
  color: var(--paper);
}

.page-about .about-hero h1 .hl {
  color: var(--gold-bright);
  display: inline-block;
  border-bottom: 4px solid rgba(217, 164, 65, 0.45);
  padding-bottom: 2px;
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(201, 214, 223, 0.88);
}

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

.page-about .coord-card {
  position: relative;
  padding: 22px 20px 18px;
  background: linear-gradient(160deg, rgba(16, 42, 67, 0.96), rgba(8, 24, 38, 0.92));
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .coord-card__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .coord-card__list {
  margin: 0;
}

.page-about .coord-card__list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(201, 214, 223, 0.16);
}

.page-about .coord-card__list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .coord-card__list dt {
  font-size: 13px;
  color: rgba(201, 214, 223, 0.78);
}

.page-about .coord-card__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold-bright);
  text-align: right;
}

/* ---------- 规模数据条 ---------- */
.page-about .about-stats {
  background: rgba(16, 42, 67, 0.42);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

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

.page-about .about-stats__item {
  padding: 18px 10px 18px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stats__item:nth-child(2n) {
  padding-left: 14px;
  border-left: 1px solid var(--about-hair);
}

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

.page-about .about-stats__num {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--gold-bright);
}

.page-about .about-stats__label {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(201, 214, 223, 0.72);
}

/* ---------- 章节通用 ---------- */
.page-about .chap {
  position: relative;
  padding: clamp(46px, 7vw, 86px) 0;
}

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

.page-about .chap__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .chap__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold-line);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(201, 214, 223, 0.7);
}

.page-about .chap h2 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: inherit;
}

.page-about .prose p {
  max-width: 64ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 239, 227, 0.82);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .prose strong {
  color: var(--gold-bright);
  font-weight: 600;
}

/* ---------- 时间线 ---------- */
.page-about .band--paper {
  --about-dot: #f5efe3;
  color: var(--ink);
}

.page-about .band--paper .chap__idx {
  color: var(--about-gold-deep);
}

.page-about .band--paper .chap__note {
  color: rgba(10, 17, 24, 0.68);
  border-left-color: rgba(154, 108, 28, 0.45);
}

.page-about .band--paper .prose p {
  color: rgba(10, 17, 24, 0.78);
}

.page-about .tl-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .tl-figure {
  margin: 0;
  max-width: 420px;
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, rgba(217, 164, 65, 0.95), rgba(217, 164, 65, 0.12));
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 24px;
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--about-dot);
  border: 2px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .tl__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--about-gold-deep);
}

.page-about .tl__card {
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(10, 17, 24, 0.1);
  border-left: 3px solid var(--gold);
  transition: transform 0.22s ease, border-color 0.22s ease;
}

.page-about .tl__card:hover {
  transform: translateY(-2px);
  border-left-color: var(--poplar);
}

.page-about .tl__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(10, 17, 24, 0.74);
}

/* ---------- 区域图例 ---------- */
.page-about .region-figure {
  margin: 24px 0 22px;
}

.page-about .legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .legend__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 13px;
  background: rgba(16, 42, 67, 0.5);
  border: 1px solid var(--about-hair);
  font-size: 14px;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .legend__item:hover {
  background: rgba(217, 164, 65, 0.14);
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .legend__dot {
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--oasis);
  transform: rotate(45deg);
  transition: background 0.2s ease;
}

.page-about .legend__item:hover .legend__dot {
  background: var(--gold-bright);
}

.page-about .legend__name {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .legend__scene {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: rgba(201, 214, 223, 0.66);
  text-align: right;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 24px 0 0;
}

.page-about .team-card {
  position: relative;
  padding: 20px 18px 18px;
  background: linear-gradient(150deg, rgba(8, 24, 38, 0.72), rgba(16, 42, 67, 0.6));
  border: 1px solid var(--about-hair);
  border-top: 3px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 0.22s ease, border-top-color 0.22s ease;
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-top-color: var(--gold-bright);
}

.page-about .team-card__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--gold-bright);
}

.page-about .team-card__num span {
  font-family: var(--font-body);
  font-size: 12px;
  margin-left: 4px;
  color: rgba(201, 214, 223, 0.7);
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(201, 214, 223, 0.8);
}

.page-about .team-figure {
  margin: 24px 0 0;
}

.page-about .fold {
  margin-top: 14px;
  background: rgba(8, 24, 38, 0.46);
  border: 1px solid var(--about-hair);
  transition: border-color 0.2s ease;
}

.page-about .fold[open] {
  border-color: rgba(217, 164, 65, 0.45);
}

.page-about .fold__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
}

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

.page-about .fold__sum::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--gold);
}

.page-about .fold[open] .fold__sum::after {
  content: "–";
}

.page-about .fold__body {
  padding: 0 16px 16px;
}

.page-about .fold__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 239, 227, 0.76);
}

/* ---------- 质量清单 ---------- */
.page-about .qlist {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .qlist__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .qlist__item:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .qlist__n {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--poplar);
  padding-top: 3px;
}

.page-about .qlist__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .qlist__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(245, 239, 227, 0.75);
}

/* ---------- 结尾承诺 ---------- */
.page-about .chap--end {
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .promise {
  position: relative;
  padding: clamp(26px, 4vw, 44px);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(217, 164, 65, 0.2), transparent 62%),
    linear-gradient(160deg, rgba(27, 58, 92, 0.92), rgba(8, 24, 38, 0.96));
  border: 1px solid rgba(217, 164, 65, 0.28);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}

.page-about .promise h2 {
  margin: 10px 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .promise__text {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(201, 214, 223, 0.86);
}

.page-about .promise__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .promise__links a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  text-decoration: none;
  background: rgba(8, 24, 38, 0.5);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--gold);
  transition: background 0.2s ease, transform 0.2s ease, border-left-color 0.2s ease;
}

.page-about .promise__links a:hover {
  background: rgba(217, 164, 65, 0.12);
  border-left-color: var(--gold-bright);
  transform: translateY(-2px);
}

.page-about .promise__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--gold-bright);
}

.page-about .promise__desc {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(201, 214, 223, 0.74);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .about-hero {
    padding: 44px 0 68px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.82fr);
    gap: 52px;
    align-items: end;
  }

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

  .page-about .about-stats__item {
    padding: 22px 22px;
    border-bottom: 0;
    border-left: 1px solid var(--about-hair);
  }

  .page-about .about-stats__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .chap__grid {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .chap__aside {
    padding-top: 6px;
  }

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

  .page-about .qlist__item {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1080px) {
  .page-about .tl-wrap {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .tl-figure {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .team-card,
  .page-about .legend__item,
  .page-about .promise__links a {
    transition: none;
  }

  .page-about .tl__card:hover,
  .page-about .team-card:hover,
  .page-about .legend__item:hover,
  .page-about .promise__links a:hover {
    transform: none;
  }
}