.page-about {
  --ab-rail-w: 216px;
  --ab-paper-ink: #0B1017;
  --ab-body-ink: rgba(11, 16, 23, 0.76);
  --ab-body-dim: rgba(11, 16, 23, 0.6);
  --ab-hair-dark: rgba(16, 27, 46, 0.12);
  --ab-card-line: rgba(16, 27, 46, 0.1);
  background: var(--jh-ink-blue);
  color: var(--jh-paper);
  font-family: var(--jh-font);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: 56px 0 88px;
  background:
    radial-gradient(120% 92% at 86% 6%, rgba(217, 164, 65, 0.2) 0%, rgba(16, 27, 46, 0) 60%),
    linear-gradient(158deg, #101B2E 0%, #0B1017 100%);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -160px;
  bottom: -220px;
  width: 540px;
  height: 540px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 164, 65, 0.14), rgba(217, 164, 65, 0) 70%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
  align-items: center;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 26px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--jh-mist);
}

.page-about .ab-crumb__link {
  color: var(--jh-mist);
  text-decoration: none;
  transition: color 0.2s var(--jh-ease);
}

.page-about .ab-crumb__link:hover,
.page-about .ab-crumb__link:focus-visible {
  color: var(--jh-gold-lite);
}

.page-about .ab-crumb__sep {
  color: rgba(124, 140, 160, 0.5);
}

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

.page-about .ab-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--jh-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--jh-gold);
}

.page-about .ab-hero__title {
  margin: 0 0 24px;
  font-size: clamp(32px, 6.2vw, 66px);
  font-weight: 900;
  line-height: 1.09;
  letter-spacing: -0.01em;
  color: var(--jh-paper);
  max-width: 15em;
}

.page-about .ab-hero__lede {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(244, 237, 226, 0.82);
}

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

.page-about .ab-hero__note a {
  color: var(--jh-gold-lite);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-hero__note a:hover,
.page-about .ab-hero__note a:focus-visible {
  color: var(--jh-gold);
}

.page-about .ab-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  border-radius: var(--jh-radius-l);
  object-fit: cover;
  border: 1px solid var(--jh-line-gold);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.5);
}

.page-about .ab-figcap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--jh-mist);
}

/* ---------- 主体纸面 ---------- */

.page-about .ab-body {
  position: relative;
  z-index: 2;
  margin-top: -36px;
  padding: 64px 0 92px;
  background: var(--jh-paper);
  color: var(--ab-paper-ink);
  border-radius: var(--jh-radius-l) var(--jh-radius-l) 0 0;
}

.page-about .ab-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

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

/* ---------- 章目索引 ---------- */

.page-about .ab-rail {
  align-self: start;
  min-width: 0;
}

.page-about .ab-rail__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  font-family: var(--jh-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--jh-mist);
  border-bottom: 1px solid var(--ab-hair-dark);
}

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

.page-about .ab-rail__link {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ab-body-dim);
  text-decoration: none;
  border: 1px solid var(--ab-hair-dark);
  border-radius: 999px;
  transition: color 0.2s var(--jh-ease), border-color 0.2s var(--jh-ease), background 0.2s var(--jh-ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--jh-ink-blue);
  border-color: rgba(217, 164, 65, 0.6);
}

.page-about .ab-rail__link[aria-current="location"] {
  color: var(--jh-ink-blue);
  font-weight: 600;
  border-color: var(--jh-gold);
  background: rgba(217, 164, 65, 0.16);
}

/* ---------- 章节 ---------- */

.page-about .ab-sec {
  scroll-margin-top: 92px;
}

.page-about .ab-sec + .ab-sec {
  margin-top: 88px;
}

.page-about .ab-sec__index {
  margin: 0 0 10px;
  font-family: var(--jh-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--jh-vermilion);
}

.page-about .ab-sec__title {
  margin: 0 0 20px;
  font-size: clamp(25px, 3.6vw, 40px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--jh-ink-blue);
  max-width: 16em;
}

.page-about .ab-sec__lede {
  margin: 0 0 32px;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ab-body-dim);
}

.page-about .ab-prose {
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ab-body-ink);
}

.page-about .ab-prose p {
  margin: 0 0 18px;
}

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

.page-about .ab-prose a {
  color: var(--jh-vermilion);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 阶段 ---------- */

.page-about .ab-stages {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-bottom: 40px;
}

.page-about .ab-stage {
  position: relative;
  padding: 24px 22px 26px 26px;
  background: #FFFFFF;
  border: 1px solid var(--ab-card-line);
  border-radius: var(--jh-radius);
  box-shadow: 0 12px 30px rgba(16, 27, 46, 0.06);
  transition: transform 0.24s var(--jh-ease), box-shadow 0.24s var(--jh-ease);
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--jh-gold);
}

.page-about .ab-stage:nth-child(2)::before {
  background: var(--jh-jade);
}

.page-about .ab-stage:nth-child(3)::before {
  background: var(--jh-violet);
}

.page-about .ab-stage:nth-child(4)::before {
  background: var(--jh-vermilion);
}

.page-about .ab-stage:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(16, 27, 46, 0.1);
}

.page-about .ab-stage__year {
  margin: 0 0 10px;
  font-family: var(--jh-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--jh-ink-blue);
}

.page-about .ab-stage h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--jh-ink-blue);
}

.page-about .ab-stage p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-body-ink);
}

/* ---------- 图框 ---------- */

.page-about .ab-figure {
  margin: 0;
  border-radius: var(--jh-radius-l);
  overflow: hidden;
  background: var(--jh-ink-blue);
  border: 1px solid rgba(217, 164, 65, 0.34);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-about .ab-figure .ab-figcap {
  margin: 0;
  padding: 12px 18px 14px;
  color: rgba(244, 237, 226, 0.72);
}

/* ---------- 团队 ---------- */

.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.page-about .ab-role {
  padding: 22px 20px 24px;
  border-radius: var(--jh-radius);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--ab-card-line);
}

.page-about .ab-role__no {
  margin: 0 0 12px;
  font-family: var(--jh-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--jh-gold);
}

.page-about .ab-role h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--jh-ink-blue);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-body-ink);
}

.page-about .ab-rollout {
  padding: 26px 24px 28px;
  border-radius: var(--jh-radius);
  background: var(--jh-ink-blue);
  color: var(--jh-paper);
}

.page-about .ab-rollout__title {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 800;
  color: var(--jh-gold-lite);
}

.page-about .ab-rollout__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .ab-rollout__steps li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 237, 226, 0.84);
}

.page-about .ab-rollout__n {
  flex: 0 0 auto;
  font-family: var(--jh-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--jh-gold);
  padding-top: 3px;
}

/* ---------- 产品线 ---------- */

.page-about .ab-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .ab-line {
  padding: 24px 22px 26px;
  border-radius: var(--jh-radius);
  background: #FFFFFF;
  border: 1px solid var(--ab-card-line);
  border-top: 4px solid var(--ab-line-accent, var(--jh-gold));
  transition: transform 0.24s var(--jh-ease);
}

.page-about .ab-line:hover {
  transform: translateY(-2px);
}

.page-about .ab-line--client {
  --ab-line-accent: var(--jh-gold);
}

.page-about .ab-line--guide {
  --ab-line-accent: var(--jh-jade);
}

.page-about .ab-line--review {
  --ab-line-accent: var(--jh-violet);
}

.page-about .ab-line__tag {
  margin: 0 0 12px;
  font-family: var(--jh-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ab-body-dim);
}

.page-about .ab-line h3 {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--jh-ink-blue);
}

.page-about .ab-line p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-body-ink);
}

.page-about .ab-line__go {
  margin-top: 16px;
  font-size: 14.5px;
  font-weight: 600;
}

.page-about .ab-line__go a {
  color: var(--jh-ink-blue);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--ab-line-accent, var(--jh-gold));
  text-decoration-thickness: 2px;
}

.page-about .ab-line__go a:hover,
.page-about .ab-line__go a:focus-visible {
  color: var(--jh-vermilion);
}

/* ---------- 兼容与维护 ---------- */

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 36px;
}

.page-about .ab-stat {
  padding: 20px 18px 22px;
  border-radius: var(--jh-radius-s);
  background: rgba(16, 27, 46, 0.05);
  border-left: 3px solid var(--jh-gold);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--jh-mono);
  font-size: clamp(26px, 4.6vw, 34px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--jh-ink-blue);
}

.page-about .ab-stat__unit {
  font-size: 0.62em;
  letter-spacing: 0.04em;
  color: var(--jh-vermilion);
  margin-left: 2px;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ab-body-dim);
}

/* ---------- 收尾支持 ---------- */

.page-about .ab-support {
  padding: 34px 26px 36px;
  border-radius: var(--jh-radius-l);
  background:
    radial-gradient(110% 120% at 92% 4%, rgba(46, 139, 110, 0.22) 0%, rgba(16, 27, 46, 0) 58%),
    linear-gradient(150deg, #1D2E4A 0%, #0B1017 100%);
  color: var(--jh-paper);
}

.page-about .ab-support .ab-sec__index {
  color: var(--jh-gold);
}

.page-about .ab-support .ab-sec__title {
  color: var(--jh-paper);
}

.page-about .ab-support__lede {
  margin: 0 0 24px;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(244, 237, 226, 0.82);
}

.page-about .ab-support__list {
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  max-width: 38em;
}

.page-about .ab-support__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 237, 226, 0.78);
}

.page-about .ab-support__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--jh-jade);
}

.page-about .ab-support__list li:nth-child(2)::before {
  background: var(--jh-gold);
}

.page-about .ab-support__list li:nth-child(3)::before {
  background: var(--jh-violet);
}

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

.page-about .ab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.2s var(--jh-ease), color 0.2s var(--jh-ease), border-color 0.2s var(--jh-ease);
}

.page-about .ab-btn--line {
  color: var(--jh-gold-lite);
  border-color: rgba(242, 214, 155, 0.5);
}

.page-about .ab-btn--line:hover,
.page-about .ab-btn--line:focus-visible {
  color: var(--jh-ink-blue);
  background: var(--jh-gold-lite);
  border-color: var(--jh-gold-lite);
}

.page-about .ab-btn--deal {
  color: #FFFFFF;
  background: var(--jh-vermilion);
  border-color: var(--jh-vermilion);
}

.page-about .ab-btn--deal:hover,
.page-about .ab-btn--deal:focus-visible {
  background: #A72D25;
  border-color: #A72D25;
}

/* ---------- 入场动效 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.32s var(--jh-ease), transform 0.32s var(--jh-ease);
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */

@media (min-width: 680px) {
  .page-about .ab-hero {
    padding: 72px 0 104px;
  }

  .page-about .ab-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 22px;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-support {
    padding: 42px 40px 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-body {
    margin-top: -48px;
    padding: 80px 0 108px;
  }

  .page-about .ab-body__inner {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: 68px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 88px;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .ab-rail__link {
    padding: 9px 12px 9px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 8px 8px 0;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    background: rgba(217, 164, 65, 0.1);
    border-left-color: rgba(217, 164, 65, 0.6);
  }

  .page-about .ab-rail__link[aria-current="location"] {
    border-left-color: var(--jh-gold);
    background: rgba(217, 164, 65, 0.14);
  }

  .page-about .ab-stage:nth-child(2),
  .page-about .ab-stage:nth-child(4) {
    margin-top: 40px;
  }

  .page-about .ab-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-sec--offset {
    padding-left: 40px;
  }

  .page-about .ab-figure--tall {
    max-width: 76%;
  }
}

@media (min-width: 1240px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-rail {
    --ab-rail-w: 224px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .ab-stage,
  .page-about .ab-line {
    transition: none;
  }
}