.page-about {
  --about-edge: rgba(143, 163, 191, 0.26);
  --about-edge-soft: rgba(143, 163, 191, 0.14);
  --about-card: rgba(15, 31, 61, 0.72);
  --about-body: rgba(244, 239, 228, 0.78);
}

.page-about h2 {
  font-family: var(--cond);
  font-size: clamp(22px, 4.4vw, 36px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0 0 14px;
}

.page-about h3 {
  font-family: var(--sans);
  font-size: clamp(16px, 2.4vw, 19px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about p {
  color: var(--about-body);
  margin: 0 0 14px;
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(14px, 2.5vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 52px) 0 clamp(32px, 6vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__lede h1 {
  font-family: var(--cond);
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.02;
  letter-spacing: 0.005em;
  color: var(--paper);
  margin: 8px 0 18px;
  text-wrap: balance;
}

.page-about .about-hero__lede .lede {
  max-width: 60ch;
}

.page-about .about-hero__lede .btn-row {
  margin-top: 22px;
}

/* 速览战术板 */
.page-about .about-board {
  position: relative;
  padding: 20px 18px 22px 22px;
  background:
    linear-gradient(150deg, rgba(255, 138, 42, 0.16), rgba(8, 18, 38, 0) 58%),
    var(--ink);
  border: 1px solid var(--about-edge);
}

.page-about .about-board::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--sun), var(--ember));
}

.page-about .about-board__head {
  font-family: var(--cond);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 16px;
}

.page-about .about-board__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
}

.page-about .about-board__cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 1px solid var(--about-edge-soft);
  padding-left: 12px;
}

.page-about .about-board__num {
  font-family: var(--mono);
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-board__label {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 品牌宣言 ---------- */
.page-about .about-declaration {
  padding: clamp(28px, 5vw, 64px) 0;
  border-top: 1px solid var(--about-edge-soft);
}

.page-about .about-declaration__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-declaration__figure .figure__media img {
  object-fit: cover;
}

.page-about .about-declaration__text p {
  max-width: 62ch;
}

/* ---------- 发展路径 ---------- */
.page-about .about-path {
  padding: clamp(30px, 5vw, 66px) 0;
  background:
    linear-gradient(180deg, rgba(15, 31, 61, 0.9), rgba(8, 18, 38, 0.4)),
    var(--night);
  border-top: 1px solid var(--about-edge-soft);
  border-bottom: 1px solid var(--about-edge-soft);
}

.page-about .about-path__track {
  list-style: none;
  margin: 0;
  padding: 4px 0 20px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--sun) transparent;
}

.page-about .about-path__track::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-path__track::-webkit-scrollbar-thumb {
  background: linear-gradient(90deg, var(--sun), var(--gold));
}

.page-about .about-path__track:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .about-path__item {
  flex: 0 0 clamp(232px, 74vw, 296px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 16px 20px;
  background: linear-gradient(180deg, rgba(15, 31, 61, 0.92), rgba(8, 18, 38, 0.72));
  border: 1px solid var(--about-edge);
  border-top: 3px solid var(--sun);
}

.page-about .about-path__item:nth-child(even) {
  border-top-color: var(--gold);
  transform: translateY(10px);
}

.page-about .about-path__item p {
  font-size: 14px;
  margin: 0;
}

.page-about .about-path__figure {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(32px, 5vw, 70px) 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-team__card {
  position: relative;
  padding: 24px 20px 22px;
  background:
    linear-gradient(160deg, rgba(244, 239, 228, 0.07), rgba(15, 31, 61, 0.92));
  border: 1px solid var(--about-edge);
  box-shadow: 7px 7px 0 rgba(8, 18, 38, 0.55);
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 208, 186, 0));
}

.page-about .about-team__count {
  display: block;
  font-family: var(--mono);
  font-size: clamp(30px, 6.4vw, 44px);
  line-height: 1;
  color: var(--sun);
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__card p {
  font-size: 14px;
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-network {
  padding: clamp(30px, 5vw, 66px) 0;
  border-top: 1px solid var(--about-edge-soft);
}

.page-about .about-network__grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-network__text .btn-row {
  margin-top: 20px;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  padding: clamp(32px, 5vw, 70px) 0;
  background:
    radial-gradient(120% 90% at 90% 0%, rgba(255, 138, 42, 0.12), rgba(8, 18, 38, 0) 60%),
    var(--night);
  border-top: 1px solid var(--about-edge-soft);
  border-bottom: 1px solid var(--about-edge-soft);
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-rhythm__item {
  position: relative;
  padding: 20px 0 22px 26px;
  border-left: 1px solid var(--about-edge);
}

.page-about .about-rhythm__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--sun);
  transform: rotate(45deg);
}

.page-about .about-rhythm__item:last-child {
  border-left-color: transparent;
}

.page-about .about-rhythm__step {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid rgba(53, 208, 186, 0.4);
  padding: 3px 8px;
  margin-bottom: 10px;
}

.page-about .about-rhythm__item p {
  font-size: 14px;
  max-width: 70ch;
  margin: 0;
}

/* ---------- 术语研究板 ---------- */
.page-about .about-terms {
  padding: clamp(32px, 5vw, 70px) 0;
}

.page-about .about-terms__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-term {
  display: flex;
  flex-direction: column;
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-about .about-term .note-card__body {
  font-size: 14px;
  flex: 1;
}

.page-about .about-term__link {
  display: inline-block;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 208, 186, 0.45);
  padding-bottom: 1px;
}

.page-about .about-term:hover,
.page-about .about-term:focus-within {
  transform: translateY(-4px);
  border-color: rgba(255, 138, 42, 0.55);
}

.page-about .about-term__link:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(30px, 5vw, 66px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-cta__inner {
  background:
    linear-gradient(120deg, rgba(255, 138, 42, 0.18), rgba(8, 18, 38, 0.2) 55%),
    var(--ink);
  border: 1px solid var(--about-edge);
  padding: clamp(24px, 4vw, 44px);
  display: grid;
  gap: 22px;
}

.page-about .about-cta__text p {
  max-width: 58ch;
  margin: 0;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .about-declaration__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 46px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-rhythm__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .about-rhythm__item:nth-child(2) {
    border-left-color: transparent;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .about-terms__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .about-board__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-path__item:nth-child(even) {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-term,
  .page-about .about-path__item {
    transition: none;
  }

  .page-about .about-term:hover,
  .page-about .about-term:focus-within {
    transform: none;
  }

  .page-about .about-path__item:nth-child(even) {
    transform: none;
  }
}