.page-about {
  --about-band: clamp(44px, 6.5vw, 92px);
}

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

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

.page-about .crumbs {
  padding-block: 18px 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-500);
}

.page-about .crumbs a {
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
}

.page-about .crumbs a:hover {
  color: var(--ink-900);
}

.page-about .crumbs span {
  margin-inline: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(22px, 3vw, 40px) var(--about-band);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(36px, 9vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--ink-900);
  margin: 12px 0 0;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--ink-700);
  box-shadow: inset 0 -0.16em 0 var(--gold-300);
}

.page-about .about-hero__lead .lede {
  margin-top: 20px;
  max-width: 46ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2vw, 20px) 0 0;
  border-top: 1px solid var(--paper-line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px 16px;
}

.page-about .about-hero__facts li {
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate-500);
}

.page-about .about-hero__facts .mono {
  display: block;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--gold-500);
  margin-bottom: 4px;
}

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

.page-about .about-hero__figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-card);
}

/* ---------- 坐标带 ---------- */
.page-about .coord {
  margin-top: clamp(30px, 4.5vw, 56px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .coord__cell {
  background: var(--ivory-050);
  padding: 16px 16px 18px;
}

.page-about .coord__k {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate-500);
}

.page-about .coord__v {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-900);
  word-break: break-word;
}

.page-about .coord__v.mono {
  font-size: 13px;
  color: var(--ink-700);
}

/* ---------- 通用分栏 ---------- */
.page-about .band {
  padding-block: var(--about-band);
  border-top: 1px solid var(--paper-line);
}

.page-about .split {
  display: grid;
  gap: clamp(20px, 3vw, 46px);
}

.page-about .split__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  margin: 10px 0 0;
}

.page-about .split__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-500);
}

.page-about .split__main > p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-700);
  max-width: 70ch;
}

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

.page-about .split__main > p a {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-500);
}

.page-about .split__main > p a:hover {
  color: var(--ink-500);
  border-bottom-color: var(--ink-500);
}

/* ---------- 年份时间线 ---------- */
.page-about .tl {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
}

.page-about .tl__years {
  list-style: none;
  margin: 0;
  padding: 2px 2px 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .tl__years a {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background: var(--ivory-100);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-700);
  text-decoration: none;
}

.page-about .tl__years a:hover {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--gold-300);
}

.page-about .tl__entry {
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-card);
  background: var(--ivory-100);
  margin-bottom: 12px;
  overflow: hidden;
}

.page-about .tl__entry[open] {
  background: var(--ivory-050);
  box-shadow: var(--shadow-deep);
}

.page-about .tl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-500);
  border-left: 2px solid var(--gold-500);
  padding-left: 8px;
}

.page-about .tl__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .tl__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--paper-line);
  margin-top: 0;
}

.page-about .tl__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
  max-width: 62ch;
}

.page-about .tl__figure {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
}

.page-about .tl__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-card);
}

/* ---------- 团队面板 ---------- */
.page-about .team-panels {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .team-panel {
  padding: 20px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-card);
  background: var(--ivory-100);
}

.page-about .team-panel--ink {
  background: var(--ink-900);
  border-color: var(--ink-900);
}

.page-about .team-panel__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  color: var(--gold-500);
}

.page-about .team-panel__role {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .team-panel--ink .team-panel__role {
  color: var(--ivory-050);
}

.page-about .team-panel__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .team-panel--ink .team-panel__text {
  color: var(--ivory-100);
}

.page-about .split__main > figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .split__main > figure img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius-card);
}

/* ---------- 合作编号列表 ---------- */
.page-about .coop {
  list-style: none;
  counter-reset: coop;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .coop > li {
  counter-increment: coop;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 20px 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .coop > li:last-child {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .coop > li::before {
  content: counter(coop, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
  padding-top: 3px;
}

.page-about .coop h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .coop p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
  max-width: 64ch;
}

.page-about .coop p a {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-500);
}

.page-about .coop p a:hover {
  color: var(--ink-500);
  border-bottom-color: var(--ink-500);
}

/* ---------- 联系卡 ---------- */
.page-about .contact-card {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(22px, 3.5vw, 44px);
  border-radius: var(--radius-card);
  background: var(--ink-900);
  color: var(--ivory-050);
}

.page-about .contact-card h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ivory-050);
}

.page-about .contact-card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ivory-100);
  max-width: 56ch;
}

.page-about .contact-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 18px;
}

.page-about .contact-card__links a {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: 2px;
}

.page-about .contact-card__links a:hover {
  color: var(--ivory-050);
  border-bottom-color: var(--gold-300);
}

.page-about .contact-list {
  margin: 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--hair);
}

.page-about .contact-list dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-300);
  margin-bottom: 4px;
}

.page-about .contact-list dd {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ivory-050);
  word-break: break-word;
}

.page-about .contact-list dd:last-child {
  margin-bottom: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .coord {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .contact-card {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .contact-list {
    border-top: 0;
    padding-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-about .tl {
    grid-template-columns: 156px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .tl__years {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--paper-line);
  }

  .page-about .tl__years a {
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    letter-spacing: 0.1em;
  }

  .page-about .tl__years a:hover {
    background: transparent;
    color: var(--ink-900);
    border-left-color: var(--gold-500);
  }
}

@media (min-width: 1160px) {
  .page-about .split__aside {
    padding-right: 12px;
  }

  .page-about .about-hero__title {
    font-size: clamp(56px, 6.4vw, 88px);
  }
}