.page-about {
  --ab-gap: clamp(32px, 5vw, 68px);
  --ab-chapter-pad: clamp(52px, 8vw, 112px);
  --ab-line-soft: rgba(23, 65, 90, .6);
}

.page-about .dj-breadcrumb {
  padding-top: 24px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: clamp(28px, 4vw, 52px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(40px, 5vw, 72px);
  }
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 10px 0 0;
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin-top: 20px;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
  margin: 38px 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--ab-line-soft);
}

@media (min-width: 640px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

.page-about .ab-fact__label {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: .04em;
  margin-bottom: 8px;
}

.page-about .ab-fact__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .ab-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

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

/* 首屏视觉 */
.page-about .ab-visual {
  margin: 0;
  padding: 18px 18px 0;
  border: 2px solid var(--line);
  background:
    linear-gradient(160deg, rgba(10, 37, 54, .95), rgba(4, 18, 28, .98));
  box-shadow: var(--shadow-hard);
  position: relative;
}

.page-about .ab-visual::after {
  content: "";
  position: absolute;
  top: -2px;
  right: -2px;
  width: 46px;
  height: 46px;
  background: var(--cyan);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  opacity: .9;
}

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

.page-about .ab-visual__grid line {
  stroke: var(--line);
  stroke-width: 1;
  opacity: .75;
}

.page-about .ab-visual__area {
  fill: rgba(53, 245, 208, .08);
}

.page-about .ab-visual__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .ab-visual__node {
  fill: var(--orange);
}

.page-about .ab-visual__node-ring {
  fill: none;
  stroke: var(--orange);
  stroke-width: 1.5;
  opacity: .55;
}

.page-about .ab-visual__caption {
  margin: 14px 0 0;
  padding: 14px 0 18px;
  border-top: 1px solid var(--ab-line-soft);
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 通栏图 ---------- */
.page-about .ab-band {
  margin: clamp(44px, 6vw, 84px) 0 0;
}

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

.page-about .ab-band .dj-media__frame {
  border: 2px solid var(--line);
  overflow: hidden;
}

/* ---------- 双列骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(48px, 7vw, 96px);
}

@media (min-width: 1080px) {
  .page-about .ab-layout {
    grid-template-columns: minmax(0, 188px) minmax(0, 1fr);
    gap: 0 clamp(48px, 5vw, 84px);
  }
}

/* 章节索引 */
.page-about .ab-index {
  margin-bottom: 36px;
}

.page-about .ab-index__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
  margin: 0 0 12px;
}

.page-about .ab-index__list {
  display: flex;
  gap: 21px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  border-top: 1px solid var(--ab-line-soft);
  padding-top: 14px;
}

.page-about .ab-index__item {
  flex: 0 0 auto;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 2px 4px;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  white-space: nowrap;
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--ivory);
  border-bottom-color: var(--cyan-dim);
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-dim);
}

@media (min-width: 1080px) {
  .page-about .ab-index {
    position: sticky;
    top: 112px;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .ab-index__link {
    font-size: 13px;
    padding: 8px 0 8px 10px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--cyan-dim);
  }
}

.page-about:has(#ab-ch-1:target) .ab-index__link[href="#ab-ch-1"],
.page-about:has(#ab-ch-2:target) .ab-index__link[href="#ab-ch-2"],
.page-about:has(#ab-ch-3:target) .ab-index__link[href="#ab-ch-3"],
.page-about:has(#ab-ch-4:target) .ab-index__link[href="#ab-ch-4"],
.page-about:has(#ab-ch-5:target) .ab-index__link[href="#ab-ch-5"],
.page-about:has(#ab-ch-6:target) .ab-index__link[href="#ab-ch-6"] {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .ab-chapters {
  min-width: 0;
}

.page-about .ab-chapter {
  position: relative;
  padding: var(--ab-chapter-pad) 0 0;
  border-top: 1px solid var(--ab-line-soft);
  scroll-margin-top: 120px;
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-chapter::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 34px;
  height: 6px;
  background: var(--cyan-dim);
}

.page-about .ab-chapter:first-child::before {
  display: none;
}

.page-about .ab-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px 22px;
  margin-bottom: 22px;
}

.page-about .ab-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 68px);
  font-weight: 700;
  line-height: 1;
  color: rgba(53, 245, 208, .38);
}

.page-about .ab-chapter__title {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--ivory);
}

.page-about .ab-chapter__body {
  max-width: 38em;
}

.page-about .ab-chapter__body p {
  margin: 0 0 18px;
  color: var(--mist);
}

.page-about .ab-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .ab-chapter__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 245, 208, .4);
}

.page-about .ab-chapter__body a:hover,
.page-about .ab-chapter__body a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .ab-pull {
  margin: 30px 0 0;
  padding: 24px 26px;
  border: 2px solid var(--cyan-dim);
  border-left-width: 8px;
  background: rgba(10, 37, 54, .8);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-pull p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.5;
  color: var(--mist-light);
}

/* ---------- 三件事 ---------- */
.page-about .ab-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .ab-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .ab-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-principle {
  padding: 24px 22px 26px;
  border: 2px solid var(--line);
  background: var(--ink-soft);
  box-shadow: var(--shadow-hard);
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-principle:hover {
  border-color: var(--cyan-dim);
}

.page-about .ab-principle__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  letter-spacing: .16em;
  margin-bottom: 12px;
}

.page-about .ab-principle__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -.01em;
  margin: 0 0 12px;
  color: var(--ivory);
}

.page-about .ab-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 28px;
  border-left: 2px solid var(--line);
}

.page-about .ab-timeline__item {
  position: relative;
  padding-bottom: 14px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 17px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-timeline__item:has(details[open])::before {
  background: var(--cyan);
}

.page-about .ab-node {
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-node__summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 22px;
  gap: 6px 14px;
  align-items: center;
  padding: 14px 4px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .ab-node__year {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan-dim);
}

.page-about .ab-node__label {
  grid-column: 1;
  font-size: 16px;
  font-weight: 600;
  color: var(--ivory);
}

.page-about .ab-node__mark {
  grid-column: 2;
  grid-row: 1 / span 2;
  justify-self: end;
  align-self: center;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

.page-about .ab-node__mark::before {
  content: "+";
}

.page-about .ab-node[open] .ab-node__mark::before {
  content: "–";
}

.page-about .ab-node__body {
  padding: 0 4px 20px;
}

.page-about .ab-node__body p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 6px;
}

@media (min-width: 900px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }
}

.page-about .ab-team__body p {
  margin: 0 0 18px;
  max-width: 36em;
  color: var(--mist);
}

.page-about .ab-team__body p:last-child {
  margin-bottom: 0;
}

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

.page-about .ab-team__media .dj-media__frame {
  border: 2px solid var(--line);
  overflow: hidden;
  box-shadow: var(--shadow-hard);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco__media {
  margin: 30px 0 0;
}

.page-about .ab-eco__media .dj-media__frame {
  border: 2px solid var(--line);
  overflow: hidden;
}

.page-about .ab-eco__media .dj-media__caption {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--mist);
}

.page-about .ab-eco__media + .ab-chapter__body {
  margin-top: 26px;
}

/* ---------- 覆盖点阵 ---------- */
.page-about .ab-coverage {
  margin: 30px 0 0;
  padding: 26px 24px 22px;
  border: 2px solid var(--line);
  background: rgba(10, 37, 54, .72);
}

.page-about .ab-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 460px;
}

.page-about .ab-dots li {
  width: 12px;
  height: 12px;
  background: var(--cyan);
  opacity: .26;
  transform: rotate(45deg);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-dots li:hover {
  opacity: 1;
  transform: rotate(45deg) scale(1.18);
}

.page-about .ab-dots li.ab-dot--abroad {
  background: var(--orange);
  opacity: .5;
}

.page-about .ab-coverage__note {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 规模数字 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin: 26px 0 0;
  padding: 0;
}

@media (min-width: 760px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px 24px;
  }
}

.page-about .ab-stat {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-stat__label {
  font-size: 13px;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .ab-stat__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--ivory);
}

.page-about .ab-stat__unit {
  font-size: 13px;
  color: var(--cyan-dim);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  margin-top: clamp(64px, 9vw, 130px);
  padding: clamp(44px, 6vw, 76px) 0 clamp(50px, 7vw, 88px);
  border-top: 1px solid var(--ab-line-soft);
  background:
    linear-gradient(180deg, rgba(10, 37, 54, .55), rgba(4, 18, 28, 0) 70%);
}

.page-about .ab-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 36px);
  letter-spacing: -.02em;
  line-height: 1.2;
  margin: 10px 0 0;
  color: var(--ivory);
}

.page-about .ab-cta__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .ab-cta__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-cta__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

.page-about .ab-cta__link {
  display: block;
  height: 100%;
  padding: 22px 20px 24px;
  border: 2px solid var(--line);
  background: rgba(4, 18, 28, .6);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-cta__link:hover,
.page-about .ab-cta__link:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .ab-cta__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .ab-cta__desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-cta__legal {
  margin: 34px 0 0;
  max-width: 46em;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  padding-top: 18px;
  border-top: 1px solid var(--ab-line-soft);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cta__link,
  .page-about .ab-dots li,
  .page-about .ab-principle,
  .page-about .ab-index__link {
    transition: none;
  }

  .page-about .ab-cta__link:hover,
  .page-about .ab-cta__link:focus-visible {
    transform: none;
  }
}