.page-about {
  --ab-line: rgba(244, 246, 241, 0.14);
  --ab-line-strong: rgba(200, 255, 77, 0.28);
  background: var(--ink);
  color: var(--chalk);
  overflow-x: clip;
}

.page-about > section {
  position: relative;
  padding-block: clamp(2.6rem, 7vw, 5.4rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-head {
  max-width: 56ch;
  margin-bottom: clamp(1.8rem, 4vw, 3rem);
}

.page-about .ab-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.2vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 0.55rem 0 0.9rem;
}

.page-about .ab-head__lede {
  margin: 0;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(1.4rem, 4vw, 2.4rem) clamp(2.4rem, 6vw, 4.6rem);
  border-top: 0;
  background:
    radial-gradient(115% 85% at 92% 0%, rgba(200, 255, 77, 0.11), transparent 62%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 138, 71, 0.07), transparent 60%),
    var(--ink);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 2rem;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fog);
  margin-bottom: 1.4rem;
}

.page-about .ab-crumb a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-crumb__sep {
  color: rgba(143, 163, 155, 0.6);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.2vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 0.5rem 0 1.2rem;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--ink);
  background: var(--lime);
  padding: 0 0.16em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.page-about .ab-hero__lede {
  max-width: 60ch;
  margin: 0;
  color: rgba(244, 246, 241, 0.82);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .ab-hero__meta {
  border: 1px solid var(--ab-line);
  border-top: 3px solid var(--lime);
  background: var(--ink-2);
  box-shadow: 6px 6px 0 0 var(--ink-3);
  padding: 1.1rem 1.15rem 0.5rem;
}

.page-about .ab-hero__metatitle {
  margin: 0 0 0.4rem;
}

.page-about .ab-figures {
  margin: 0;
}

.page-about .ab-figures__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0;
  border-bottom: 1px dashed rgba(143, 163, 155, 0.28);
}

.page-about .ab-figures__row:last-child {
  border-bottom: 0;
}

.page-about .ab-figures dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.page-about .ab-figures dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 4vw, 1.7rem);
  line-height: 1;
}

.page-about .ab-figures__unit {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--fog);
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  display: none;
}

/* ---------- 分工面板 ---------- */
.page-about .ab-roles {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-role {
  position: relative;
  border: 1px solid var(--ab-line);
  border-left: 2px solid var(--ab-line-strong);
  background: var(--ink-2);
  padding: clamp(1.1rem, 3vw, 1.7rem);
  box-shadow: 6px 6px 0 0 var(--ink-3);
}

.page-about .ab-role--b {
  border-left-color: rgba(255, 138, 71, 0.55);
}

.page-about .ab-role__no {
  position: absolute;
  top: 1rem;
  right: 1.05rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .ab-role__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1rem, 3vw, 1.36rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.7rem;
  color: var(--lime-soft);
}

.page-about .ab-role--b .ab-role__title {
  color: var(--amber);
}

.page-about .ab-role__text {
  margin: 0 0 0.9rem;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 246, 241, 0.84);
}

.page-about .ab-role__tags {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fog);
}

.page-about .ab-role__figure {
  margin: 1.2rem 0 0;
  border: 1px solid var(--ab-line);
  padding: 6px;
  background: var(--ink-3);
}

.page-about .ab-role__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(0.85) contrast(1.04);
}

/* ---------- 值班时间带 ---------- */
.page-about .ab-shift-section {
  background: var(--ink-2);
}

.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
  counter-reset: none;
}

.page-about .ab-track__item {
  position: relative;
  padding-top: 1.1rem;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-track__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--lime);
}

.page-about .ab-track__time {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--lime);
  margin-bottom: 0.5rem;
}

.page-about .ab-track__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  margin: 0 0 0.5rem;
}

.page-about .ab-track__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 三级复核 ---------- */
.page-about .ab-review {
  display: grid;
  gap: 1.6rem;
}

.page-about .ab-review__figure {
  margin: 0;
  border: 1px solid var(--ab-line);
  background: var(--ink-3);
  padding: 8px;
}

.page-about .ab-review__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

.page-about .ab-review__figure figcaption {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fog);
  padding: 0 2px 2px;
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .ab-steps__item {
  border: 1px solid var(--ab-line);
  background: var(--ink-2);
  padding: 1.05rem 1.15rem 1.1rem;
  scroll-margin-top: 110px;
  transition: border-color 200ms ease, background 200ms ease;
}

.page-about .ab-steps__item:target {
  border-color: var(--lime);
  background: rgba(200, 255, 77, 0.07);
}

.page-about .ab-steps__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  margin-bottom: 0.35rem;
}

.page-about .ab-steps__item h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  margin: 0 0 0.5rem;
}

.page-about .ab-steps__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 246, 241, 0.84);
}

.page-about .ab-steps__owner {
  margin-top: 0.65rem !important;
  font-family: var(--font-mono);
  font-size: 11px !important;
  letter-spacing: 0.1em;
  color: var(--fog) !important;
}

.page-about .ab-tree-wrap {
  margin: 1.8rem 0 0;
  border: 1px solid var(--ab-line);
  background:
    repeating-linear-gradient(0deg, rgba(244, 246, 241, 0.035) 0 1px, transparent 1px 22px),
    var(--ink);
  padding: 1rem;
}

.page-about .ab-tree {
  display: block;
  width: 100%;
  height: auto;
  max-width: 620px;
  margin: 0 auto;
}

.page-about .ab-tree__node rect {
  transition: fill 180ms ease;
}

.page-about .ab-tree__node:hover rect,
.page-about .ab-tree__node:focus-visible rect {
  fill: #1d453a;
}

.page-about .ab-tree__node:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .ab-tree__cap {
  margin: 0.6rem 0 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fog);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline-section {
  background: var(--ink-2);
}

.page-about .ab-timeline__banner {
  margin: 0 0 clamp(1.8rem, 4vw, 2.8rem);
  border: 1px solid var(--ab-line);
  padding: 6px;
  background: var(--ink-3);
}

.page-about .ab-timeline__banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 7 / 3;
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  bottom: 1.4rem;
  width: 1px;
  background: rgba(200, 255, 77, 0.22);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: 1.9rem;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 3.5px);
  top: 0.62rem;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

.page-about .ab-tl__year {
  display: block;
  font-size: clamp(1.25rem, 3.4vw, 1.7rem);
  letter-spacing: 0.02em;
  color: var(--lime);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.page-about .ab-tl__body h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.04rem;
  margin: 0 0 0.45rem;
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 58ch;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-cov {
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-cov__cell {
  background: var(--ink);
  padding: 1.2rem 1.15rem 1.35rem;
}

.page-about .ab-cov__num {
  margin: 0 0 0.25rem;
  font-size: clamp(2rem, 7vw, 3rem);
  line-height: 1;
}

.page-about .ab-cov__cell h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.98rem;
  margin: 0 0 0.5rem;
  color: var(--chalk);
}

.page-about .ab-cov__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--fog);
}

.page-about .ab-cov__note {
  margin: 1.5rem 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .ab-cov__note a {
  color: var(--lime-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 77, 0.45);
}

.page-about .ab-cov__note a:hover,
.page-about .ab-cov__note a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 合作 ---------- */
.page-about .ab-partners-section {
  background: var(--ink-2);
}

.page-about .ab-partners {
  display: grid;
  gap: 1.2rem;
}

.page-about .ab-partners__item {
  border-top: 2px solid var(--amber);
  background: rgba(5, 19, 15, 0.45);
  padding: 1.05rem 1.1rem 1.2rem;
}

.page-about .ab-partners__item h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 0.5rem;
  color: var(--amber);
}

.page-about .ab-partners__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .ab-partners__stamp {
  margin-top: 1.8rem;
  max-width: 62ch;
}

.page-about .ab-partners__stamp p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 246, 241, 0.86);
}

/* ---------- 联系 ---------- */
.page-about .ab-join {
  display: grid;
  gap: 2rem;
}

.page-about .ab-join__body h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 0.5rem 0 1rem;
}

.page-about .ab-join__body p {
  margin: 0 0 1rem;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 246, 241, 0.84);
  max-width: 62ch;
}

.page-about .ab-join__mail {
  font-family: var(--font-mono);
  color: var(--lime);
  word-break: break-all;
}

.page-about .ab-join__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem !important;
}

.page-about .ab-join__side {
  border: 1px solid var(--ab-line);
  background: var(--ink-2);
  padding: 1.1rem 1.15rem 1.2rem;
  box-shadow: 6px 6px 0 0 var(--ink-3);
}

.page-about .ab-join__side ul {
  list-style: none;
  margin: 0.6rem 0 0;
  padding: 0;
}

.page-about .ab-join__side li {
  padding: 0.62rem 0;
  border-bottom: 1px dashed rgba(143, 163, 155, 0.28);
}

.page-about .ab-join__side li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-join__side a {
  display: block;
  color: var(--chalk);
  text-decoration: none;
  font-size: 14.5px;
  transition: color 180ms ease;
}

.page-about .ab-join__side a:hover,
.page-about .ab-join__side a:focus-visible {
  color: var(--lime);
}

.page-about .ab-join__side span {
  display: block;
  margin-top: 0.15rem;
  font-size: 12px;
  color: var(--fog);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .ab-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.6rem;
  }

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

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

  .page-about .ab-join {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 2.4rem;
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(255px, 0.82fr);
    gap: 2.6rem;
    align-items: end;
  }

  .page-about .ab-hero__meta {
    margin-bottom: 0.4rem;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1.6rem;
  }

  .page-about .ab-roles > .ab-role--a {
    grid-column: 1 / 8;
  }

  .page-about .ab-roles > .ab-role--b {
    grid-column: 8 / 13;
    margin-top: 2.4rem;
  }

  .page-about .ab-roles > .ab-role--c {
    grid-column: 2 / 9;
    margin-top: -0.6rem;
  }

  .page-about .ab-review {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 2.2rem;
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .ab-index {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    position: fixed;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    padding: 0.9rem 0.75rem;
    border: 1px solid var(--ab-line);
    background: rgba(10, 36, 32, 0.82);
    backdrop-filter: blur(6px);
  }

  .page-about .ab-index::before {
    content: "";
    position: absolute;
    right: 0.72rem;
    top: 0.9rem;
    bottom: 0.9rem;
    width: 1px;
    background: rgba(200, 255, 77, 0.18);
  }

  .page-about .ab-index__link {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.22rem 0.6rem 0.22rem 0.35rem;
    text-decoration: none;
    color: var(--fog);
    border-left: 2px solid transparent;
    transition: color 200ms ease, border-color 200ms ease;
  }

  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible,
  .page-about .ab-index__link.is-active,
  .page-about .ab-index__link[aria-current="true"] {
    color: var(--lime);
    border-left-color: var(--lime);
  }

  .page-about .ab-index__no {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    opacity: 0.85;
  }

  .page-about .ab-index__name {
    font-size: 12px;
    letter-spacing: 0.1em;
  }

  .page-about .ab-join {
    gap: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-crumb a,
  .page-about .ab-cov__note a,
  .page-about .ab-join__side a,
  .page-about .ab-tree__node rect,
  .page-about .ab-index__link {
    transition: none;
  }
}