.page-about {
  --ab-line: var(--jy-line-light);
  background: var(--jy-ink-900);
  color: var(--jy-text-light);
  font-family: var(--jy-font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

.page-about [id] {
  scroll-margin-top: 92px;
}

.page-about a {
  text-decoration: none;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding-block: 20px clamp(36px, 6vw, 78px);
  border-bottom: 1px solid var(--ab-line);
  background:
    radial-gradient(110% 78% at 92% 2%, rgba(43, 224, 207, 0.13), transparent 62%),
    radial-gradient(85% 70% at 2% 98%, rgba(233, 162, 59, 0.09), transparent 64%),
    linear-gradient(180deg, rgba(15, 34, 56, 0.55), rgba(8, 24, 39, 0));
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ab-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.45;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.65), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.65), transparent 72%);
  pointer-events: none;
}

.page-about .ab-breadcrumbs {
  position: relative;
  z-index: 1;
  padding-block: 0 18px;
  font-size: 13px;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

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

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--jy-font-display);
  font-size: clamp(29px, 6.2vw, 56px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .ab-hero__lead {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 48ch;
  color: var(--jy-mute-light);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .ab-hero__actions {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 0;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-hero__facts li {
  flex: 1 1 128px;
  min-width: 0;
  padding-inline: 16px;
  border-left: 1px solid var(--ab-line);
}

.page-about .ab-hero__facts li:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-about .ab-fact__num {
  display: block;
  font-family: var(--jy-font-mono);
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--jy-cyan-400);
}

.page-about .ab-fact__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--jy-mute-light);
}

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

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--jy-line-cyan);
  border-radius: var(--jy-radius);
  background: var(--jy-ink-800);
  box-shadow: var(--jy-shadow-card);
}

.page-about .ab-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--jy-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--jy-mute-light);
}

/* ---------- 通用区块与档案分栏 ---------- */

.page-about .ab-section {
  padding-block: clamp(34px, 5.2vw, 76px);
}

.page-about .ab-section--tint {
  background: linear-gradient(180deg, rgba(15, 34, 56, 0.62), rgba(15, 34, 56, 0.1));
  border-block: 1px solid var(--ab-line);
}

.page-about .ab-sheet {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
}

.page-about .ab-rail {
  min-width: 0;
  border-left: 1px solid var(--jy-line-cyan);
  padding-left: 14px;
}

.page-about .ab-rail__label {
  margin: 0;
  font-family: var(--jy-font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--jy-amber-500);
}

.page-about .ab-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 18px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 0;
  font-size: 14px;
  color: var(--jy-mute-light);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--jy-cyan-400);
  border-bottom-color: var(--jy-line-cyan);
}

.page-about .ab-rail__link:focus-visible {
  outline: 2px solid var(--jy-cyan-400);
  outline-offset: 3px;
}

.page-about .ab-rail__num {
  font-family: var(--jy-font-mono);
  font-size: 11px;
  color: var(--jy-amber-500);
}

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

.page-about .ab-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .ab-head__num {
  font-family: var(--jy-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--jy-amber-500);
}

.page-about .ab-head h2 {
  margin: 0;
  font-family: var(--jy-font-heading);
  font-size: clamp(22px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .ab-head p {
  margin: 0;
  max-width: 62ch;
  color: var(--jy-mute-light);
  font-size: 15px;
}

/* ---------- 场景卡片 ---------- */

.page-about .ab-cards {
  display: grid;
  gap: 14px;
}

.page-about .ab-card {
  position: relative;
  min-width: 0;
  padding: 20px 20px 22px 22px;
  background: linear-gradient(165deg, rgba(23, 50, 77, 0.92), rgba(15, 34, 56, 0.94));
  border: 1px solid var(--ab-line);
  border-radius: var(--jy-radius);
  box-shadow: var(--jy-shadow-card);
  overflow: hidden;
}

.page-about .ab-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: linear-gradient(180deg, var(--jy-cyan-400), transparent 86%);
}

.page-about .ab-card--amber::before {
  background: linear-gradient(180deg, var(--jy-amber-500), transparent 86%);
}

.page-about .ab-card__idx {
  font-family: var(--jy-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--jy-amber-500);
}

.page-about .ab-card h3 {
  margin: 10px 0 8px;
  font-family: var(--jy-font-heading);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.42;
}

.page-about .ab-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--jy-mute-light);
}

/* ---------- 阶段切换 ---------- */

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

.page-about .ab-stages__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .ab-stage-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  background: rgba(15, 34, 56, 0.75);
  border: 1px solid var(--ab-line);
  border-radius: var(--jy-radius-sm);
  color: var(--jy-mute-light);
  font-family: var(--jy-font-heading);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-stage-tab:hover {
  color: var(--jy-text-light);
  border-color: var(--jy-line-cyan);
}

.page-about .ab-stage-tab[aria-selected="true"] {
  background: rgba(43, 224, 207, 0.13);
  border-color: var(--jy-line-cyan);
  color: var(--jy-text-light);
  box-shadow: inset 0 0 0 1px rgba(43, 224, 207, 0.18);
}

.page-about .ab-stage-tab:focus-visible {
  outline: 2px solid var(--jy-cyan-400);
  outline-offset: 2px;
}

.page-about .ab-stage-tab__num {
  font-family: var(--jy-font-mono);
  font-size: 11px;
  color: var(--jy-amber-500);
}

.page-about .ab-stage-panel {
  margin-top: 16px;
  padding: clamp(18px, 3vw, 30px);
  background: linear-gradient(150deg, rgba(23, 50, 77, 0.78), rgba(8, 24, 39, 0.94));
  border: 1px solid var(--ab-line);
  border-radius: var(--jy-radius);
  box-shadow: var(--jy-shadow-card);
}

.page-about .ab-stage-panel[hidden] {
  display: none;
}

.page-about .ab-stage-panel h3 {
  margin: 0 0 10px;
  font-family: var(--jy-font-heading);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-stage-panel p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--jy-mute-light);
}

.page-about .ab-stage-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-stage-meta li {
  padding: 5px 11px;
  font-family: var(--jy-font-mono);
  font-size: 12px;
  color: var(--jy-cyan-400);
  background: rgba(43, 224, 207, 0.07);
  border: 1px solid var(--jy-line-cyan);
  border-radius: 999px;
}

/* ---------- 图注 ---------- */

.page-about .ab-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  min-width: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ab-line);
  border-radius: var(--jy-radius);
  background: var(--jy-ink-800);
  box-shadow: var(--jy-shadow-card);
}

.page-about .ab-figure__caption {
  margin-top: 10px;
  font-family: var(--jy-font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--jy-mute-light);
}

/* ---------- 频道索引 ---------- */

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

.page-about .ab-channel {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ab-line);
  transition: background 0.2s ease;
}

.page-about .ab-channel:hover {
  background: rgba(23, 50, 77, 0.42);
}

.page-about .ab-channel__num {
  padding-top: 3px;
  font-family: var(--jy-font-mono);
  font-size: 12px;
  color: var(--jy-amber-500);
}

.page-about .ab-channel__name {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-family: var(--jy-font-heading);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-channel__link {
  color: var(--jy-text-light);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-channel__link:hover,
.page-about .ab-channel__link:focus-visible {
  color: var(--jy-cyan-400);
  border-bottom-color: var(--jy-line-cyan);
}

.page-about .ab-channel__now {
  font-family: var(--jy-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--jy-ink-900);
  background: var(--jy-amber-500);
  border-radius: 2px;
  padding: 2px 7px;
}

.page-about .ab-channel__desc {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--jy-mute-light);
}

.page-about .ab-note {
  margin-top: clamp(20px, 3vw, 28px);
  padding: 18px 20px;
  background: rgba(15, 34, 56, 0.6);
  border: 1px solid var(--ab-line);
  border-left: 2px solid var(--jy-cyan-600);
  border-radius: var(--jy-radius-sm);
}

.page-about .ab-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--jy-mute-light);
}

.page-about .ab-note p + p {
  margin-top: 10px;
}

.page-about .ab-note a {
  color: var(--jy-cyan-400);
  border-bottom: 1px solid var(--jy-line-cyan);
}

.page-about .ab-note a:hover,
.page-about .ab-note a:focus-visible {
  color: var(--jy-text-light);
}

/* ---------- 团队与标准 ---------- */

.page-about .ab-team {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
  align-items: start;
}

.page-about .ab-team > div {
  min-width: 0;
}

.page-about .ab-roles {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-role {
  padding: 14px 16px;
  background: rgba(15, 34, 56, 0.64);
  border: 1px solid var(--ab-line);
  border-left: 2px solid var(--jy-cyan-600);
  border-radius: var(--jy-radius-sm);
}

.page-about .ab-role__name {
  margin: 0 0 4px;
  font-family: var(--jy-font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--jy-cyan-400);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--jy-mute-light);
}

.page-about .ab-standards {
  position: relative;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .ab-standard {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--ab-line);
}

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

.page-about .ab-standard__num {
  padding-top: 2px;
  font-family: var(--jy-font-mono);
  font-size: 12px;
  color: var(--jy-amber-500);
}

.page-about .ab-standard__title {
  margin: 0 0 4px;
  font-family: var(--jy-font-heading);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-standard p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--jy-mute-light);
}

/* ---------- 规模数据 ---------- */

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-stat {
  min-width: 0;
  padding: 18px 16px;
  background: rgba(15, 34, 56, 0.7);
  border: 1px solid var(--ab-line);
  border-top: 2px solid var(--jy-amber-500);
  border-radius: var(--jy-radius-sm);
}

.page-about .ab-stat:nth-child(even) {
  border-top-color: var(--jy-cyan-600);
}

.page-about .ab-stat__value {
  display: block;
  font-family: var(--jy-font-mono);
  font-size: clamp(23px, 3vw, 31px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--jy-text-light);
}

.page-about .ab-stat__value small {
  margin-left: 2px;
  font-size: 13px;
  font-weight: 500;
  color: var(--jy-cyan-400);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--jy-mute-light);
}

/* ---------- 暖纸联系卡 ---------- */

.page-about .ab-paper {
  padding: clamp(20px, 3.6vw, 44px);
  background: var(--jy-paper-050);
  color: var(--jy-text-dark);
  border: 1px solid var(--jy-line-dark);
  border-radius: var(--jy-radius);
  box-shadow: var(--jy-shadow-paper);
}

.page-about .ab-paper .ab-head__num {
  color: var(--jy-cyan-600);
}

.page-about .ab-paper h2 {
  margin: 8px 0 0;
  font-family: var(--jy-font-heading);
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--jy-text-dark);
}

.page-about .ab-paper__lead {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--jy-mute-dark);
}

.page-about .ab-paper__grid {
  display: grid;
  gap: 0;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--jy-line-dark);
}

.page-about .ab-paper__item {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--jy-line-dark);
}

.page-about .ab-paper__label {
  margin: 0;
  font-family: var(--jy-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--jy-mute-dark);
}

.page-about .ab-paper__value {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--jy-text-dark);
  word-break: break-word;
}

.page-about .ab-paper__actions {
  margin-top: clamp(20px, 3vw, 28px);
  align-items: center;
}

.page-about .ab-paper__link {
  font-size: 14px;
  color: var(--jy-cyan-600);
  border-bottom: 1px solid rgba(12, 143, 149, 0.35);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-paper__link:hover,
.page-about .ab-paper__link:focus-visible {
  color: var(--jy-text-dark);
  border-bottom-color: var(--jy-text-dark);
}

.page-about .ab-paper__link:focus-visible {
  outline: 2px solid var(--jy-cyan-600);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cards {
    gap: 16px;
  }
}

@media (min-width: 720px) {
  .page-about .ab-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-cards > :nth-child(even) {
    margin-top: 26px;
  }

  .page-about .ab-channel {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 16px;
    padding: 18px 12px 18px 0;
  }

  .page-about .ab-paper__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .ab-figure--side {
    margin-top: 0;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-sheet {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-rail__list {
    display: grid;
    gap: 0;
    margin-top: 12px;
  }

  .page-about .ab-rail__link {
    display: flex;
    width: 100%;
    padding: 7px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}