.page-about {
  background: var(--paper);
  color: var(--ink);
  --about-cut: var(--cut);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(18px, 3vw, 28px) clamp(40px, 7vw, 78px);
  background:
    radial-gradient(circle at 82% 12%, rgba(95, 242, 214, .16), transparent 58%),
    linear-gradient(165deg, #0B3B3C 0%, #145A57 64%, #0B3B3C 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 9px;
  background: repeating-linear-gradient(115deg, var(--signal) 0 16px, transparent 16px 32px);
  opacity: .85;
}

.page-about .about-crumb {
  color: rgba(233, 228, 214, .62);
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-crumb .breadcrumb__item {
  color: inherit;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
}

.page-about .about-hero__copy .eyebrow {
  color: var(--fluoro);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.6vw, 58px);
  line-height: 1.08;
  letter-spacing: -.012em;
  transform: scaleX(.965);
  transform-origin: left center;
  color: #F5F1E6;
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 32em;
  color: rgba(233, 228, 214, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .about-hero__visual {
  padding: clamp(10px, 2vw, 18px);
  border: 1px solid rgba(95, 242, 214, .28);
  background: rgba(9, 48, 49, .55);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

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

/* ---------- 年份坐标轴 + 历程 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
}

.page-about .about-axis .eyebrow {
  margin-bottom: 10px;
}

.page-about .about-axis__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink-60);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-axis__item .mono {
  color: var(--brick);
  letter-spacing: .06em;
}

.page-about .about-axis__item:hover,
.page-about .about-axis__item:focus-visible {
  color: var(--ink);
  border-color: var(--signal);
  background: var(--sand);
}

.page-about .about-axis__media {
  margin: 0;
  display: none;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-axis__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-timeline__body .lede {
  margin-top: 10px;
  max-width: 40em;
}

.page-about .about-era {
  position: relative;
  margin-top: clamp(20px, 3vw, 30px);
  padding: 4px 0 4px clamp(16px, 2.4vw, 28px);
  border-left: 2px solid var(--line);
  scroll-margin-top: 20px;
  transition: border-color .25s var(--ease);
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 12px;
  width: 12px;
  height: 12px;
  background: var(--paper);
  border: 2px solid var(--sea);
  transform: rotate(45deg);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-era:target {
  border-left-color: var(--signal);
}

.page-about .about-era:target::before {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .about-era__year {
  margin: 0;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--brick);
}

.page-about .about-era h3 {
  margin: 6px 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 25px);
  line-height: 1.35;
}

.page-about .about-era p {
  margin: 0;
  max-width: 44em;
  color: var(--ink-60);
  line-height: 1.85;
}

/* ---------- 三条线 ---------- */
.page-about .about-lines {
  background: var(--paper-soft);
}

.page-about .about-head .lede {
  margin-top: 10px;
  max-width: 42em;
}

.page-about .about-lines__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-line {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-line--signal {
  border-top: 3px solid var(--signal);
}

.page-about .about-line--deep {
  background: var(--deep);
  border-color: transparent;
  color: var(--paper);
}

.page-about .about-line--sand {
  background: var(--sand);
  border-top: 3px solid var(--brick);
}

.page-about .about-line__num {
  display: block;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--signal);
}

.page-about .about-line--deep .about-line__num {
  color: var(--fluoro);
}

.page-about .about-line h3 {
  margin: 12px 0 8px;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
}

.page-about .about-line p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-60);
}

.page-about .about-line--deep p {
  color: rgba(233, 228, 214, .8);
}

.page-about .about-line__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 10px;
  font-size: 14px;
  color: var(--brick);
  text-decoration: underline;
  text-underline-offset: 5px;
  transition: color .2s var(--ease);
}

.page-about .about-line--deep .about-line__link {
  color: var(--fluoro);
}

.page-about .about-line__link:hover {
  color: var(--signal);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, var(--deep) 0%, #0A3334 100%);
  color: var(--paper);
}

.page-about .about-team .eyebrow {
  color: var(--fluoro);
}

.page-about .about-team .section-title {
  color: #F5F1E6;
}

.page-about .about-team .lede {
  margin-top: 10px;
  max-width: 42em;
  color: rgba(233, 228, 214, .76);
}

.page-about .about-team__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: rgba(95, 242, 214, .22);
  border: 1px solid rgba(95, 242, 214, .22);
}

.page-about .about-role {
  padding: clamp(18px, 3vw, 28px);
  background: #0E4142;
  transition: background .22s var(--ease);
}

.page-about .about-role:hover {
  background: #12504F;
}

.page-about .about-role__num {
  display: block;
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--fluoro);
}

.page-about .about-role h3 {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #F5F1E6;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 228, 214, .76);
}

/* ---------- 资料库 ---------- */
.page-about .about-library__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-library__copy .lede {
  margin-top: 10px;
  max-width: 40em;
}

.page-about .about-legend {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .about-legend__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 12px 14px;
  border-left: 3px solid var(--mist);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-legend__item + .about-legend__item {
  margin-top: 2px;
}

.page-about .about-legend__item:hover {
  border-left-color: var(--signal);
  background: rgba(216, 199, 168, .55);
}

.page-about .about-legend__label {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-legend__value {
  color: var(--brick);
  font-size: 15px;
}

.page-about .about-legend__hint {
  flex-basis: 100%;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-40);
  transition: color .2s var(--ease);
}

.page-about .about-legend__item:hover .about-legend__hint {
  color: var(--ink-60);
}

.page-about .about-library__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 16px;
  font-size: 15px;
  color: var(--brick);
  text-decoration: underline;
  text-underline-offset: 5px;
}

.page-about .about-library__link:hover {
  color: var(--signal);
}

.page-about .about-library__figure {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-library__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 适配复核 ---------- */
.page-about .about-fit {
  background: linear-gradient(180deg, rgba(216, 199, 168, .5), rgba(233, 228, 214, 0) 82%);
}

.page-about .about-fit .lede {
  margin-top: 10px;
  max-width: 42em;
}

.page-about .about-fit__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fit__cell {
  padding: clamp(16px, 2.6vw, 26px);
  background: var(--paper);
}

.page-about .about-fit__num {
  margin: 0;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  color: var(--deep);
  letter-spacing: -.01em;
}

.page-about .about-fit__num span {
  color: var(--signal);
}

.page-about .about-fit__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-60);
}

/* ---------- 合作网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-network__copy .lede {
  margin-top: 10px;
  max-width: 38em;
}

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

.page-about .about-network__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-network__num {
  flex: 0 0 auto;
  min-width: 74px;
  font-size: clamp(20px, 3.6vw, 26px);
  color: var(--brick);
}

.page-about .about-network__num span {
  font-size: 14px;
}

.page-about .about-network__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-60);
}

.page-about .about-network .shell + .shell {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-quote {
  margin: 0;
  padding: clamp(20px, 3.4vw, 34px);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-40);
}

/* ---------- 结尾联系 ---------- */
.page-about .about-close__figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-close__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-close__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-close__copy .lede {
  margin-top: 10px;
  max-width: 34em;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-close__card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
}

.page-about .about-close__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--fluoro);
}

.page-about .about-close__value {
  margin: 4px 0 16px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(233, 228, 214, .9);
  overflow-wrap: anywhere;
}

.page-about .about-close__value.mono {
  letter-spacing: .02em;
}

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

.page-about .about-close__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(95, 242, 214, .28);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(233, 228, 214, .66);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr .9fr;
    align-items: center;
  }

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

  .page-about .about-line:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-line:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-library__grid {
    grid-template-columns: 1.05fr .95fr;
    align-items: center;
  }

  .page-about .about-network__grid {
    grid-template-columns: .95fr 1.05fr;
    align-items: start;
  }

  .page-about .about-close__grid {
    grid-template-columns: 1.06fr .94fr;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 210px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: 24px;
  }

  .page-about .about-axis__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    margin-bottom: 24px;
  }

  .page-about .about-axis__item {
    width: 100%;
    border: 0;
    background: none;
    border-left: 2px solid var(--line);
    padding: 8px 0 8px 14px;
    margin-left: -2px;
  }

  .page-about .about-axis__item:hover,
  .page-about .about-axis__item:focus-visible {
    background: none;
    border-left-color: var(--signal);
    color: var(--ink);
  }

  .page-about .about-axis__media {
    display: block;
    aspect-ratio: 3 / 4;
  }

  .page-about .about-era:nth-of-type(even) {
    margin-left: clamp(0px, 4vw, 46px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__item,
  .page-about .about-era,
  .page-about .about-era::before,
  .page-about .about-role,
  .page-about .about-legend__item,
  .page-about .about-legend__hint,
  .page-about .about-line__link {
    transition: none;
  }
}