.page-about {
  --abcol: 236px;
  display: block;
  color: var(--pale);
  background:
    radial-gradient(140% 62% at 88% 0%, rgba(30, 74, 66, 0.55), transparent 62%),
    var(--felt);
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 6vw, 72px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 44px);
  align-items: start;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .ab-hero__lead h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.06;
  letter-spacing: 0.005em;
  margin: 16px 0 0;
  color: var(--pale);
}

.page-about .ab-hero__intro {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(15.5px, 1.9vw, 18px);
  line-height: 1.8;
  color: rgba(242, 246, 243, 0.84);
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

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

.page-about .ab-hero__figure .media {
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.page-about .ab-band {
  margin-top: clamp(34px, 5vw, 62px);
  height: 4px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(200, 162, 74, 0.34) 32%, rgba(200, 162, 74, 0) 82%);
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .ab-hero__figure {
    margin-top: clamp(24px, 3vw, 46px);
  }
}

/* ---------- 章节导航条 ---------- */
.page-about .ab-jump {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(4, 21, 18, 0.4);
}

.page-about .ab-jump__track {
  display: flex;
  gap: clamp(18px, 3vw, 42px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 14px 0;
  scrollbar-width: none;
}

.page-about .ab-jump__track::-webkit-scrollbar {
  display: none;
}

.page-about .ab-jump__track a {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--sage);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-jump__track a:hover,
.page-about .ab-jump__track a:focus-visible,
.page-about .ab-jump__track a.is-active {
  color: var(--amber);
  border-bottom-color: var(--gold);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .ab-section {
  padding: clamp(44px, 7vw, 92px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-section--tint {
  background: linear-gradient(180deg, rgba(16, 56, 47, 0.42) 0%, rgba(10, 39, 35, 0) 100%);
}

.page-about .ab-section:last-of-type {
  border-bottom: 0;
}

.page-about .ab-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .ab-col-head h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(25px, 3.8vw, 40px);
  line-height: 1.12;
  margin: 14px 0 0;
  color: var(--pale);
}

.page-about .ab-col-head p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--sage);
  max-width: 30ch;
}

.page-about .ab-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .ab-index::after {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--gold);
  opacity: 0.6;
}

@media (min-width: 960px) {
  .page-about .ab-sec {
    grid-template-columns: var(--abcol) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 86px);
  }

  .page-about .ab-col-head {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

/* ---------- 正文排版 ---------- */
.page-about .ab-col-body > p {
  margin: 0 0 18px;
  font-size: clamp(15.5px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 243, 0.86);
}

.page-about .ab-col-body > p.ab-lede {
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.74;
  color: var(--pale);
  border-left: 2px solid var(--gold);
  padding-left: clamp(14px, 2vw, 22px);
}

.page-about .ab-col-body > p.ab-note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sage);
  border-top: 1px solid var(--line-soft);
  padding-top: 18px;
}

/* ---------- 三根支柱 ---------- */
.page-about .ab-pillars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-pillar {
  padding: clamp(18px, 2.4vw, 26px);
  border-radius: var(--r-m);
}

.page-about .ab-pillar h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 19px;
  margin: 0 0 8px;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .ab-pillar p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 246, 243, 0.78);
}

@media (min-width: 700px) {
  .page-about .ab-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 数据模块 ---------- */
.page-about .ab-metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-metric {
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--r-m);
  border-top: 2px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-metric:nth-child(1) {
  border-top-color: var(--gold);
}

.page-about .ab-metric:nth-child(4) {
  border-top-color: var(--amber);
}

.page-about .ab-metric__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .ab-metric__num small {
  font-size: 0.42em;
  font-weight: 600;
  margin-left: 5px;
  color: var(--amber);
}

.page-about .ab-metric__label {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--pale);
}

.page-about .ab-metric__note {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--sage);
}

@media (min-width: 780px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-metric:nth-child(1) {
    grid-column: span 4;
  }

  .page-about .ab-metric:nth-child(2) {
    grid-column: span 2;
  }

  .page-about .ab-metric:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .ab-metric:nth-child(4) {
    grid-column: span 4;
  }
}

/* ---------- 团队构成 ---------- */
.page-about .ab-roster {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .ab-roster li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
  padding: clamp(16px, 2.4vw, 22px);
  background: rgba(16, 56, 47, 0.55);
}

.page-about .ab-roster__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  grid-row: span 2;
}

.page-about .ab-roster__role {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: var(--pale);
}

.page-about .ab-roster__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sage);
}

@media (min-width: 720px) {
  .page-about .ab-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 内容把关 ---------- */
.page-about .ab-quality {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(6px, 1vw, 12px);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-steps li {
  position: relative;
  padding: 18px 0 18px 56px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-steps li:first-child {
  padding-top: 0;
}

.page-about .ab-steps li:first-child .ab-steps__num {
  top: 0;
}

.page-about .ab-steps li:last-child {
  border-bottom: 0;
}

.page-about .ab-steps__num {
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .ab-steps h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--pale);
}

.page-about .ab-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 246, 243, 0.78);
}

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

.page-about .ab-quality__figure .media {
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--line);
}

@media (min-width: 860px) {
  .page-about .ab-quality {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-quality__figure {
    position: sticky;
    top: 110px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(6px, 1vw, 12px);
}

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

.page-about .ab-partners__figure .media {
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-partners__body > p {
  margin: 0 0 20px;
  font-size: clamp(15.5px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 243, 0.86);
}

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

.page-about .ab-partners__list li {
  padding: 16px 18px;
  border-left: 2px solid var(--gold);
  background: linear-gradient(90deg, rgba(30, 74, 66, 0.55), rgba(30, 74, 66, 0.08));
  border-radius: 0 var(--r-s) var(--r-s) 0;
}

.page-about .ab-partners__list h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  margin: 0 0 5px;
  color: var(--amber);
}

.page-about .ab-partners__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(242, 246, 243, 0.8);
}

@media (min-width: 860px) {
  .page-about .ab-partners {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .ab-partners__figure {
    position: sticky;
    top: 110px;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(6px, 1vw, 12px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(200, 162, 74, 0.32) 62%, rgba(200, 162, 74, 0.06) 100%);
}

.page-about .ab-timeline__item {
  position: relative;
  padding-left: clamp(30px, 3.6vw, 40px);
  transition: transform 0.25s ease;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--felt);
  border: 2px solid var(--gold);
  box-sizing: border-box;
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .ab-timeline__item:hover::before,
.page-about .ab-timeline__item:focus-within::before {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(232, 184, 92, 0.16);
}

.page-about .ab-timeline__item:hover {
  transform: translateX(3px);
}

.page-about .ab-timeline__item--last::before {
  border-color: var(--wine);
  background: var(--wine);
}

.page-about .ab-timeline__tag {
  display: inline-block;
  margin-bottom: 8px;
}

.page-about .ab-timeline__item h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--pale);
}

.page-about .ab-timeline__item p {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 246, 243, 0.78);
}

/* ---------- 结尾指引 ---------- */
.page-about .ab-next {
  margin-top: clamp(34px, 5vw, 56px);
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(30, 74, 66, 0.62) 0%, rgba(10, 39, 35, 0.4) 100%);
  box-shadow: var(--shadow);
}

.page-about .ab-next p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 16.5px);
  line-height: 1.82;
  color: rgba(242, 246, 243, 0.86);
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 420px) {
  .page-about .ab-hero__cta,
  .page-about .ab-next__links {
    gap: 8px;
  }

  .page-about .ab-roster li {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 3px 12px;
  }

  .page-about .ab-metric__num small {
    display: block;
    margin: 4px 0 0;
  }
}