.page-about {
  --about-shadow: 0 26px 60px rgba(2, 8, 18, .45);
  --about-soft: rgba(244, 235, 221, .80);
}

.page-about .breadcrumb {
  margin: 16px 0 2px;
}

.page-about .section {
  padding: 46px 0;
}

.page-about h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--paper-2);
}

.page-about .text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(67, 230, 212, .45);
  transition: border-color .3s var(--ease), color .3s var(--ease);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--paper-2);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 12px 0 26px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -40px -18px auto;
  height: 440px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(70% 90% at 88% 0%, rgba(67, 230, 212, .16), transparent 62%),
    linear-gradient(160deg, rgba(12, 33, 56, .95), rgba(7, 20, 38, 0) 72%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 6.6vw, 56px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper-2);
}

.page-about .about-hero__intro {
  margin: 16px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__plate {
  position: relative;
  padding: 24px 20px 20px;
  border-radius: 20px 20px 20px 6px;
  border-top: 4px solid var(--cyan);
  background: var(--paper);
  color: var(--brown);
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__plate-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(33, 26, 23, .62);
}

.page-about .about-hero__version {
  display: inline-block;
  margin: 6px 0 16px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(52px, 13vw, 88px);
  line-height: 1;
  letter-spacing: -.045em;
  color: var(--ink);
  background: linear-gradient(180deg, transparent 62%, rgba(67, 230, 212, .55) 62%, rgba(67, 230, 212, .55) 88%, transparent 88%);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
  margin: 0;
  padding-top: 16px;
  border-top: 1px dashed rgba(33, 26, 23, .26);
}

.page-about .about-hero__meta dt {
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(33, 26, 23, .60);
}

.page-about .about-hero__meta dd {
  margin: 3px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 20px;
  color: var(--ink);
}

/* ---------- 年表 ---------- */
.page-about .about-chronicle__head {
  max-width: 62ch;
}

.page-about .about-chronicle__sub,
.page-about .about-team__sub {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .year-nav {
  display: flex;
  gap: 8px;
  margin: 22px 0 24px;
  padding: 12px 2px;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-about .year-nav__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--paper-2);
  font-size: 13px;
  text-decoration: none;
  transition: border-color .3s var(--ease), background .3s var(--ease), color .3s var(--ease);
}

.page-about .year-nav__link .mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 13px;
}

.page-about .year-nav__link:hover,
.page-about .year-nav__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(67, 230, 212, .10);
}

.page-about .chronicle__sheet {
  position: relative;
  padding: 24px 20px;
  border-radius: 22px 22px 22px 8px;
  background-color: var(--paper);
  background-image: radial-gradient(rgba(33, 26, 23, .055) 1px, transparent 1px);
  background-size: 16px 16px;
  color: var(--brown);
  box-shadow: var(--about-shadow);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .timeline__item {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px dashed rgba(33, 26, 23, .28);
  scroll-margin-top: 150px;
}

.page-about .timeline__item:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .timeline__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .timeline__year .mono {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 24px;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .timeline__stage {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(33, 26, 23, .55);
}

.page-about .timeline__body {
  max-width: 64ch;
}

.page-about .timeline__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.8vw, 23px);
  line-height: 1.35;
  color: var(--brown);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(33, 26, 23, .82);
}

.page-about .media {
  margin: 18px 0 0;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(33, 26, 23, .14);
  background: var(--ink-2);
}

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

.page-about .media__caption {
  padding: 8px 12px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate);
  background: rgba(7, 20, 38, .92);
}

.page-about .chronicle__quote {
  margin: 24px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(33, 26, 23, .22);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.8;
  color: var(--brown);
}

/* ---------- 状态标签 ---------- */
.page-about .about-status {
  scroll-margin-top: 130px;
}

.page-about .about-status__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-status__lead,
.page-about .about-cross__lead {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

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

.page-about .status-cell {
  position: relative;
  padding: 20px 18px 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(12, 33, 56, .94), rgba(7, 20, 38, .88));
  overflow: hidden;
  transition: border-color .35s var(--ease), transform .35s var(--ease);
}

.page-about .status-cell::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(var(--cell-accent, var(--slate)) 1px, transparent 1px);
  background-size: 12px 12px;
  opacity: .12;
}

.page-about .status-cell::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cell-accent, var(--slate));
}

.page-about .status-cell:hover,
.page-about .status-cell:focus-within {
  border-color: var(--cell-accent, var(--line));
  transform: translateY(-2px);
}

.page-about .status-cell--live { --cell-accent: var(--cyan); }
.page-about .status-cell--pending { --cell-accent: var(--amber); }
.page-about .status-cell--maintain { --cell-accent: var(--red); }
.page-about .status-cell--shift { --cell-accent: var(--red); }

.page-about .status-cell--shift .tag {
  border-style: dashed;
}

.page-about .status-cell__mean {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .88);
}

.page-about .status-cell__do {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .status-cell__do b {
  color: var(--paper-2);
  font-weight: 600;
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  max-width: 72ch;
}

.page-about .crew {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .crew__item {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .crew__item h3 {
  margin: 8px 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  color: var(--paper-2);
}

.page-about .crew__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 235, 221, .78);
}

.page-about .about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 20px;
  font-size: 15px;
}

/* ---------- 跨设备 ---------- */
.page-about .about-cross__grid {
  display: grid;
  gap: 26px;
}

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

.page-about .steps {
  list-style: none;
  counter-reset: step;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .steps li {
  position: relative;
  padding-left: 46px;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 235, 221, .82);
}

.page-about .steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  padding: 2px 6px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink);
  background: var(--cyan);
}

.page-about .about-cross__foot {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 公开信息 ---------- */
.page-about .about-open .panel {
  padding: 26px 20px;
  border-radius: 22px 22px 8px 22px;
  background: var(--paper);
  color: var(--brown);
  box-shadow: var(--about-shadow);
}

.page-about .about-open h2 {
  color: var(--brown);
}

.page-about .eyebrow--dark {
  color: rgba(33, 26, 23, .58);
}

.page-about .about-open .serif {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(33, 26, 23, .78);
}

.page-about .info-list {
  display: grid;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .info-list > div {
  padding: 14px 0;
  border-top: 1px solid rgba(33, 26, 23, .18);
}

.page-about .info-list dt {
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(33, 26, 23, .58);
}

.page-about .info-list dd {
  margin: 5px 0 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--brown);
}

.page-about .info-list dd .mono {
  font-family: var(--font-mono);
  color: var(--ink);
}

.page-about .info-list dd small {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(33, 26, 23, .62);
}

.page-about .about-open__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 栅格防溢出 ---------- */
.page-about .about-hero__grid > *,
.page-about .about-status__grid > *,
.page-about .about-cross__grid > *,
.page-about .crew > * {
  min-width: 0;
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .status-matrix {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 760px) {
  .page-about .section {
    padding: 60px 0;
  }

  .page-about .chronicle__sheet {
    padding: 38px 36px;
    border-radius: 24px 24px 24px 8px;
  }

  .page-about .timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 26px;
    padding: 26px 0;
  }

  .page-about .timeline__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .timeline__year .mono {
    font-size: 28px;
  }

  .page-about .timeline__body {
    padding-left: 24px;
    border-left: 1px solid rgba(33, 26, 23, .18);
  }

  .page-about .about-open .panel {
    padding: 40px 38px;
  }

  .page-about .info-list {
    grid-template-columns: 1fr 1fr;
    column-gap: 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero__plate {
    padding: 28px 26px 24px;
  }

  .page-about .year-nav {
    position: sticky;
    top: 84px;
    z-index: 6;
    background: rgba(7, 20, 38, .94);
    backdrop-filter: blur(10px);
  }

  .page-about .about-status__grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    margin-top: 30px;
  }

  .page-about .crew__item {
    border-top: 0;
    border-left: 2px solid var(--line);
    padding: 4px 0 4px 20px;
    transition: border-color .35s var(--ease);
  }

  .page-about .crew__item:hover {
    border-left-color: var(--cyan);
  }

  .page-about .about-cross__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 46px;
    align-items: center;
  }

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

@media (min-width: 1200px) {
  .page-about .timeline__item {
    grid-template-columns: 150px minmax(0, 1fr);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .status-cell,
  .page-about .year-nav__link,
  .page-about .crew__item {
    transition: none;
  }
}