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

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

.page-about section[id] {
  scroll-margin-top: 96px;
}

.page-about .breadcrumb {
  padding-top: 22px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--silver);
}

.page-about .breadcrumb__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  color: var(--line);
}

.page-about .breadcrumb__list a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .breadcrumb__list a:hover {
  color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(22px, 4vw, 42px) 0 clamp(32px, 5vw, 60px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .ab-hero h1 {
  margin: 16px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .ab-hero__facts {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
  align-self: start;
}

.page-about .ab-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 15px;
  background: var(--panel);
}

.page-about .ab-hero__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-hero__cap {
  font-size: 13px;
  color: var(--silver);
}

.page-about .ab-figure {
  margin: clamp(22px, 4vw, 36px) 0 0;
}

.page-about .ab-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

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

.page-about .ab-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  padding-bottom: clamp(48px, 7vw, 90px);
}

.page-about .ab-rail {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--silver);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .ab-rail__link:hover {
  color: var(--paper);
  border-color: var(--lime);
}

.page-about .ab-rail__link.is-active {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-main {
  display: grid;
  gap: clamp(44px, 6vw, 82px);
  min-width: 0;
}

.page-about .ab-sec {
  min-width: 0;
}

/* ---------- 区块标题 ---------- */
.page-about .ab-head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .ab-head__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.page-about .ab-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 4px 26px;
  border-left: 2px solid var(--line);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .ab-tl__item--now::before {
  background: var(--ink);
  border: 2px solid var(--lime);
}

.page-about .ab-tl__node summary {
  position: relative;
  display: block;
  padding-right: 26px;
  list-style: none;
  cursor: pointer;
}

.page-about .ab-tl__node summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl__node summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-tl__node[open] summary::after {
  content: "−";
}

.page-about .ab-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .ab-tl__title {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ab-tl__desc {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 数字展签 ---------- */
.page-about .ab-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .ab-board__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 14px 20px;
  background: var(--panel);
}

.page-about .ab-board__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 7vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .ab-board__num small {
  margin-left: 2px;
  font-size: 0.42em;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--silver);
}

.page-about .ab-board__label {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .ab-board__cell--paper {
  background: var(--paper);
}

.page-about .ab-board__cell--paper .ab-board__num {
  color: var(--clay);
}

.page-about .ab-board__cell--paper .ab-board__label {
  color: var(--ash);
}

/* ---------- 图文错位 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .ab-shot {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .ab-shot img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-shot figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .ab-split__text > p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--silver);
}

.page-about .ab-split__text > p.ab-note {
  margin-top: 18px;
  margin-bottom: 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
}

.page-about .ab-steps {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-steps li {
  position: relative;
  padding-left: 42px;
}

.page-about .ab-steps__num {
  position: absolute;
  left: 0;
  top: 1px;
  padding: 3px 6px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .ab-steps h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .ab-reads {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .ab-reads li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-reads__k {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-reads__v {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

/* ---------- 值守 ---------- */
.page-about .ab-watch {
  display: grid;
  gap: 2px;
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .ab-watch__row {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-about .ab-watch__time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .ab-watch__txt {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 合作与联系 ---------- */
.page-about .ab-partner {
  padding: clamp(20px, 3vw, 32px);
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-line);
}

.page-about .ab-partner h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .ab-partner > p {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .ab-partner__list {
  display: grid;
  gap: 2px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-partner__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 11px 13px;
  background: var(--ink);
}

.page-about .ab-partner__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--ash);
}

.page-about .ab-partner__v {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--paper);
  word-break: break-word;
}

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

.page-about .ab-cta {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .ab-cta p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.page-about .ab-cta__links a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: border-color var(--ease);
}

.page-about .ab-cta__links a:hover {
  border-color: var(--lime);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 640px) {
  .page-about .ab-media {
    aspect-ratio: 21 / 9;
  }

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

  .page-about .ab-hero__facts li {
    flex-direction: column;
    gap: 6px;
  }
}

@media (min-width: 720px) {
  .page-about .ab-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-watch__row {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .ab-split--flip {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .ab-split__text {
    padding-top: clamp(10px, 2.4vw, 34px);
  }

  .page-about .ab-split--flip .ab-split__text {
    padding-top: 0;
  }

  .page-about .ab-split--flip .ab-split__media {
    padding-top: clamp(10px, 2.4vw, 34px);
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .ab-tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 20px;
  }

  .page-about .ab-tl__item {
    padding: 26px 0 0;
    border-left: 0;
    border-top: 2px solid var(--line);
  }

  .page-about .ab-tl__item::before {
    left: 0;
    top: -7px;
  }

  .page-about .ab-tl__desc {
    max-width: none;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-body {
    grid-template-columns: 210px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 88px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__link {
    width: 100%;
    justify-content: flex-start;
    padding: 10px 12px;
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
  }

  .page-about .ab-rail__link.is-active {
    background: var(--panel);
    color: var(--paper);
    border-left-color: var(--lime);
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: start;
  }
}

@media (min-width: 1440px) {
  .page-about .ab-board__cell {
    padding: 22px 18px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-cta__links a,
  .page-about .breadcrumb__list a {
    transition: none;
  }
}