.page-about {
  position: relative;
}

.page-about .ab-intro {
  padding-top: clamp(92px, 13vw, 148px);
  padding-bottom: clamp(44px, 6vw, 76px);
}

.page-about .ab-intro__grid {
  display: grid;
  gap: clamp(34px, 5vw, 58px);
  margin-top: clamp(30px, 4vw, 48px);
}

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

.page-about .ab-intro__main h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white);
  text-shadow: 0 0 40px rgba(123, 92, 255, 0.32);
}

.page-about .ab-intro__main .lede {
  margin-top: clamp(18px, 2.4vw, 26px);
  max-width: 34em;
  color: var(--muted);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--line);
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 24px) clamp(14px, 2vw, 22px);
  background: var(--panel);
}

.page-about .ab-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .ab-fact__num em {
  font-style: normal;
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--gold);
}

.page-about .ab-fact__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-intro__tail {
  margin-top: clamp(22px, 3vw, 32px);
  max-width: 36em;
  color: var(--muted);
}

.page-about .ab-intro__tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 225, 255, 0.4);
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

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

/* ——— 侧边目录 ——— */
.page-about .ab-toc {
  align-self: start;
  padding: 20px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(13, 20, 48, 0.92), rgba(6, 10, 28, 0.72));
  box-shadow: var(--shadow-soft);
}

.page-about .ab-toc__head {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .ab-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .ab-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 8px;
  border-radius: var(--radius-s);
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .ab-toc__list a .mono {
  font-size: 11px;
  color: var(--violet);
  letter-spacing: 0.08em;
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  background: rgba(123, 92, 255, 0.12);
  color: var(--white);
}

/* ——— 发展历程 ——— */
.page-about .ab-timeline__head {
  max-width: 44em;
}

.page-about .ab-timeline__media {
  margin: clamp(30px, 4.4vw, 52px) 0 clamp(36px, 5vw, 64px);
}

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

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 40px;
  width: 1px;
  background: linear-gradient(180deg, var(--violet) 0%, var(--cyan) 62%, rgba(30, 42, 92, 0) 100%);
}

.page-about .ab-track__item {
  position: relative;
  padding: 0 0 clamp(30px, 4.4vw, 48px) 40px;
}

.page-about .ab-track__dot {
  position: absolute;
  left: 0;
  top: 14px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  box-shadow: var(--glow-cyan);
  animation: ab-breathe 2.4s var(--ease) infinite;
}

@keyframes ab-breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 225, 255, 0.5); }
  50% { box-shadow: 0 0 0 7px rgba(34, 225, 255, 0); }
}

.page-about .ab-track__stage {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .ab-track__title {
  margin: 0;
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--white);
  line-height: 1.5;
}

.page-about .ab-track__desc {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.45s var(--ease);
}

.page-about .ab-track__desc > p {
  overflow: hidden;
  min-height: 0;
  margin: 10px 0 0;
  max-width: 34em;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-track__desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 225, 255, 0.4);
}

.page-about .ab-track__item:hover .ab-track__title,
.page-about .ab-track__item:focus-within .ab-track__title {
  color: var(--cyan);
}

/* ——— 团队 ——— */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(30px, 4.6vw, 58px);
}

.page-about .ab-team__media {
  position: relative;
  min-width: 0;
}

.page-about .ab-team__note {
  position: absolute;
  top: 4px;
  left: -10px;
  z-index: 2;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--violet);
}

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

.page-about .ab-team__body > p {
  color: var(--muted);
  max-width: 34em;
  margin-top: 16px;
}

.page-about .ab-roles {
  list-style: none;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 4px 14px;
  padding: clamp(16px, 2.2vw, 22px) clamp(16px, 2.2vw, 24px);
  background: var(--panel);
  transition: background 0.35s var(--ease);
}

.page-about .ab-role:hover {
  background: #111a3d;
}

.page-about .ab-role__no {
  grid-row: span 2;
  font-size: 12px;
  color: var(--violet);
  letter-spacing: 0.1em;
  padding-top: 4px;
}

.page-about .ab-role h3 {
  margin: 0;
  font-size: 16px;
  color: var(--white);
}

.page-about .ab-role p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ——— 服务覆盖 ——— */
.page-about .ab-coverage__grid {
  display: grid;
  gap: clamp(30px, 4.6vw, 56px);
}

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

.page-about .ab-coverage__body > p {
  color: var(--muted);
  max-width: 34em;
  margin-top: 16px;
}

.page-about .ab-nodes {
  list-style: none;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .ab-node {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--panel);
  border-left: 2px solid transparent;
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease);
}

.page-about .ab-node:hover {
  border-left-color: var(--cyan);
  background: #111a3d;
}

.page-about .ab-node__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

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

.page-about .ab-node--wide {
  border-left-color: var(--violet);
}

.page-about .ab-coverage__media {
  align-self: center;
}

/* ——— 坚持的做法 ——— */
.page-about .ab-principles__head {
  max-width: 40em;
}

.page-about .ab-rules {
  list-style: none;
  margin: clamp(30px, 4.4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .ab-rule {
  position: relative;
  padding: clamp(22px, 3vw, 32px) clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, rgba(13, 20, 48, 0.9), rgba(6, 10, 28, 0.55));
  box-shadow: var(--shadow-soft);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.page-about .ab-rule:hover {
  transform: translateY(-4px);
  border-color: rgba(123, 92, 255, 0.65);
  box-shadow: 0 24px 52px -36px rgba(123, 92, 255, 0.9);
}

.page-about .ab-rule__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .ab-rule h3 {
  margin: 0;
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--white);
  line-height: 1.5;
}

.page-about .ab-rule p {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ——— 资质与信任 ——— */
.page-about .ab-trust__panel {
  padding: clamp(26px, 4vw, 52px) clamp(20px, 3.4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(123, 92, 255, 0.16), transparent 58%),
    linear-gradient(160deg, rgba(13, 20, 48, 0.95), rgba(6, 10, 28, 0.8));
  box-shadow: var(--shadow-soft);
}

.page-about .ab-trust__head {
  max-width: 42em;
}

.page-about .ab-trust__head p {
  margin-top: 14px;
  color: var(--muted);
}

.page-about .ab-trust__list {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .ab-trust__item {
  display: grid;
  gap: 6px;
  padding: 16px 20px;
  background: rgba(6, 10, 28, 0.72);
}

.page-about .ab-trust__key {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-trust__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--white);
  word-break: break-word;
}

.page-about .ab-trust__cta {
  margin: clamp(24px, 3.2vw, 34px) 0 0;
}

/* ——— 响应式 ——— */
@media (min-width: 760px) {
  .page-about .ab-trust__item {
    grid-template-columns: 148px 1fr;
    align-items: baseline;
    gap: 18px;
  }
  .page-about .ab-trust__key {
    padding-top: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-intro__grid {
    grid-template-columns: minmax(0, 1fr) 268px;
    align-items: start;
  }

  .page-about .ab-toc {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .ab-coverage__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 6fr);
    align-items: center;
  }

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

  .page-about .ab-track {
    padding-left: 44px;
  }

  .page-about .ab-track::before {
    left: 7px;
  }

  .page-about .ab-track__item {
    padding-left: 0;
  }

  .page-about .ab-track__dot {
    left: -44px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .ab-track__desc {
    grid-template-rows: 0fr;
  }

  .page-about .ab-track__item:hover .ab-track__desc,
  .page-about .ab-track__item:focus-within .ab-track__desc {
    grid-template-rows: 1fr;
  }

  .page-about .ab-track__item:hover .ab-track__desc > p,
  .page-about .ab-track__item:focus-within .ab-track__desc > p {
    transition: opacity 0.4s var(--ease) 0.08s;
  }
}

@media (max-width: 520px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-team__note {
    display: none;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-track__dot {
    animation: none;
  }

  .page-about .ab-rule:hover {
    transform: none;
  }
}