.page-about {
  --ab-rule: rgba(247, 247, 245, 0.14);
  --ab-rule-strong: rgba(247, 247, 245, 0.32);
  --ab-panel: rgba(27, 42, 85, 0.66);
  --ab-gap: clamp(18px, 3.2vw, 34px);
  color: var(--text-body);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 1em;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  color: var(--snow);
  line-height: 1.16;
  letter-spacing: -0.012em;
  margin: 0 0 0.55em;
}

.page-about h1 {
  font-size: clamp(1.95rem, 4.6vw, 3.35rem);
  font-weight: 900;
}

.page-about h2 {
  font-size: clamp(1.4rem, 2.6vw, 2.05rem);
  font-weight: 800;
}

.page-about h3 {
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  font-weight: 800;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--coral-soft);
  margin: 0 0 0.9em;
}

.page-about .section-head {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3.2vw, 38px);
}

.page-about .section-head > p:last-child {
  color: var(--gray);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(20px, 4vw, 46px) 0 clamp(30px, 5vw, 58px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  top: -60px;
  height: 460px;
  background:
    radial-gradient(58% 100% at 20% 0%, rgba(255, 107, 74, 0.17), transparent 70%),
    radial-gradient(52% 92% at 86% 14%, rgba(79, 174, 126, 0.14), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-hero__lede {
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  max-width: 46ch;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 14px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-hero__stat dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--gray);
  margin-bottom: 4px;
}

.page-about .ab-hero__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.1vw, 1.5rem);
  font-weight: 700;
  color: var(--snow);
  line-height: 1.1;
}

.page-about .ab-hero__stat dd span {
  font-size: 0.62em;
  font-weight: 400;
  color: var(--coral-soft);
  margin-left: 3px;
}

.page-about .ab-hero__visual {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--ab-rule);
  background: linear-gradient(150deg, var(--ink-1), var(--ink-deep));
  aspect-ratio: 4 / 3;
  box-shadow: var(--shadow);
}

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

.page-about .ab-hero__visual figcaption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--snow);
  background: rgba(10, 17, 48, 0.72);
  border: 1px solid var(--ab-rule);
  border-radius: var(--pill);
  padding: 5px 12px;
}

/* ---------- 出发点 ---------- */
.page-about .ab-origin {
  padding: clamp(26px, 4vw, 56px) 0;
}

.page-about .ab-origin__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-origin__points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-origin__points li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--r-sm);
  border: 1px solid var(--ab-rule);
  background: var(--ab-panel);
  font-size: 0.95rem;
}

.page-about .ab-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--coral);
  flex: none;
}

.page-about .ab-origin__card {
  position: relative;
  padding: 22px 20px 24px;
  background: linear-gradient(165deg, rgba(34, 50, 106, 0.8), rgba(16, 26, 58, 0.9));
  border-radius: var(--r-lg);
  border: 1px solid var(--ab-rule);
}

.page-about .ab-origin__audience {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-origin__audience li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  color: var(--text-body);
}

.page-about .ab-origin__audience li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--butter);
  transform: rotate(45deg);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-history {
  padding: clamp(34px, 5vw, 74px) 0;
}

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

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 12px;
  bottom: 26px;
  width: 3px;
  border-radius: 3px;
  opacity: 0.55;
  background: linear-gradient(180deg, var(--coral) 0%, var(--butter) 48%, var(--barley) 100%);
}

.page-about .ab-node {
  position: relative;
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 20px;
}

.page-about .ab-node__year {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  margin-top: 4px;
  border-radius: var(--pill);
  background: var(--coral);
  color: #2A0E06;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  box-shadow: 0 0 0 6px rgba(16, 26, 58, 0.94);
}

.page-about .ab-node--now .ab-node__year {
  background: var(--barley);
  color: #06200F;
}

.page-about .ab-node__panel {
  border: 1px solid var(--ab-rule);
  border-radius: var(--r-md);
  background: var(--ab-panel);
  padding: 16px 18px 18px;
  transition: transform 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .ab-node__panel h3 {
  margin-bottom: 0.5em;
}

.page-about .ab-node__panel p {
  font-size: 0.94rem;
}

.page-about .ab-node__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--gray);
  opacity: 0.62;
  transition: opacity 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.page-about .ab-node__link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--coral-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 158, 0.4);
  padding-bottom: 1px;
}

.page-about .ab-node__link:hover,
.page-about .ab-node__link:focus-visible {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

.page-about .ab-node:focus-within .ab-node__panel {
  border-color: var(--coral);
}

.page-about .ab-node:focus-within .ab-node__meta {
  opacity: 1;
}

/* ---------- 全宽分隔 ---------- */
.page-about .ab-break {
  margin: clamp(30px, 5.5vw, 76px) 0;
}

.page-about .ab-break img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--ab-rule);
}

.page-about .ab-break__cap {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.08em;
  color: var(--gray);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: clamp(28px, 4.5vw, 66px) 0;
}

.page-about .ab-team__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-team__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--ab-rule);
  background: linear-gradient(160deg, var(--ink-1), var(--ink-deep));
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-team__figure figcaption {
  padding: 12px 16px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--gray);
}

.page-about .ab-team__panels {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .folding {
  border: 1px solid var(--ab-rule);
  border-radius: var(--r-md);
  background: var(--ab-panel);
  overflow: hidden;
}

.page-about .folding > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.98rem;
  color: var(--snow);
}

.page-about .folding > summary::-webkit-details-marker {
  display: none;
}

.page-about .folding > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--coral);
}

.page-about .folding[open] > summary::after {
  content: "–";
}

.page-about .folding[open] > summary {
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .folding-body {
  padding: 14px 18px 18px;
  font-size: 0.93rem;
}

.page-about .ab-flow-head {
  margin-top: clamp(34px, 5vw, 62px);
  max-width: 52ch;
}

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-flow li {
  border: 1px solid var(--ab-rule);
  border-radius: var(--r-md);
  background: rgba(16, 26, 58, 0.5);
  padding: 18px;
}

.page-about .ab-flow li::before {
  content: "";
  display: block;
  width: 34px;
  height: 4px;
  border-radius: 4px;
  margin-bottom: 12px;
  background: var(--coral);
}

.page-about .ab-flow li:nth-child(2)::before {
  background: var(--butter);
}

.page-about .ab-flow li:nth-child(3)::before {
  background: var(--barley);
}

.page-about .ab-flow li:nth-child(4)::before {
  background: var(--coral-soft);
}

.page-about .ab-flow strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--snow);
  margin-bottom: 6px;
}

.page-about .ab-flow p {
  font-size: 0.9rem;
  margin: 0;
}

/* ---------- 数据规模 ---------- */
.page-about .ab-data {
  padding: clamp(30px, 5vw, 74px) 0;
}

.page-about .ab-data__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.page-about .ab-stat {
  position: relative;
  border: 1px solid var(--ab-rule);
  border-radius: var(--r-lg);
  padding: 20px 20px 22px;
  background: linear-gradient(165deg, rgba(34, 50, 106, 0.82), rgba(16, 26, 58, 0.92));
  overflow: hidden;
}

.page-about .ab-stat::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -34px;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 74, 0.2), transparent 70%);
  pointer-events: none;
}

.page-about .ab-stat:nth-child(2)::after {
  background: radial-gradient(circle, rgba(79, 174, 126, 0.2), transparent 70%);
}

.page-about .ab-stat:nth-child(3)::after {
  background: radial-gradient(circle, rgba(242, 193, 78, 0.2), transparent 70%);
}

.page-about .ab-stat__num {
  position: relative;
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.35rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .ab-stat__num em {
  font-style: normal;
  font-size: 0.48em;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--coral);
  margin-left: 8px;
}

.page-about .ab-stat__label {
  position: relative;
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-stat p {
  position: relative;
  margin: 12px 0 0;
  font-size: 0.91rem;
}

/* ---------- 留下的理由 ---------- */
.page-about .ab-reasons {
  padding: clamp(26px, 4.5vw, 66px) 0;
}

.page-about .ab-reasons__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(228px, 1fr));
}

.page-about .ab-reason {
  border: 1px solid var(--ab-rule);
  border-left: 3px solid var(--coral);
  border-radius: var(--r-md);
  background: rgba(16, 26, 58, 0.56);
  padding: 20px 18px 22px;
  transition: transform 0.22s ease, background-color 0.22s ease;
}

.page-about .ab-reason:nth-child(2) {
  border-left-color: var(--butter);
}

.page-about .ab-reason:nth-child(3) {
  border-left-color: var(--barley);
}

.page-about .ab-reason:nth-child(4) {
  border-left-color: var(--coral-soft);
}

.page-about .ab-reason h3 {
  font-size: 1.06rem;
  margin-bottom: 0.45em;
}

.page-about .ab-reason p {
  font-size: 0.92rem;
  margin: 0;
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  padding: clamp(18px, 3.5vw, 44px) 0 clamp(44px, 7vw, 96px);
}

.page-about .ab-cta__card {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 4vw, 42px);
  border-radius: var(--r-lg);
  border: 1px solid var(--ab-rule-strong);
  background: linear-gradient(118deg, rgba(255, 107, 74, 0.17), rgba(27, 42, 85, 0.86) 54%, rgba(79, 174, 126, 0.15));
}

.page-about .ab-cta__card h2 {
  margin-bottom: 0.4em;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-node__panel {
    padding: 20px 22px 22px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.88fr);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: stretch;
  }

  .page-about .ab-hero__visual {
    aspect-ratio: auto;
    min-height: 400px;
  }

  .page-about .ab-data__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-stat {
    grid-column: span 2;
  }

  .page-about .ab-stat--wide {
    grid-column: span 3;
  }
}

@media (min-width: 800px) {
  .page-about .ab-cta__card {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (hover: hover) {
  .page-about .ab-node:hover .ab-node__panel {
    transform: translateY(-3px);
    border-color: var(--ab-rule-strong);
    background: var(--ink-1);
  }

  .page-about .ab-node:hover .ab-node__meta {
    opacity: 1;
    color: var(--butter);
    transform: translateX(4px);
  }

  .page-about .ab-reason:hover {
    transform: translateY(-3px);
    background: rgba(27, 42, 85, 0.72);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node__panel,
  .page-about .ab-node__meta,
  .page-about .ab-reason {
    transition: none;
  }

  .page-about .ab-node:hover .ab-node__panel,
  .page-about .ab-reason:hover {
    transform: none;
  }
}