.page-about {
  position: relative;
  display: block;
  color: var(--text);
  font-family: var(--font-body);
  background:
    radial-gradient(1100px 520px at 88% -6%, rgba(61, 240, 208, 0.10), transparent 62%),
    radial-gradient(820px 460px at 2% 6%, rgba(255, 162, 75, 0.07), transparent 64%),
    var(--abyss);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding: clamp(24px, 3.6vw, 50px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(158deg, rgba(61, 240, 208, 0.09), transparent 48%),
    var(--teal);
  overflow: hidden;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: clamp(16px, 2.6vw, 32px);
  top: clamp(16px, 2.6vw, 32px);
  width: 42px;
  height: 42px;
  border-top: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
  border-top-right-radius: 14px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero .display-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 19ch;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  background: rgba(4, 16, 28, 0.76);
}

.page-about .about-facts__value {
  flex: 0 0 auto;
  min-width: 5ch;
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-facts__label {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-scale {
  height: 12px;
  margin-top: clamp(16px, 2.4vw, 24px);
  background-image: repeating-linear-gradient(90deg, var(--cyan) 0 1px, transparent 1px 20px);
  opacity: 0.34;
}

@media (min-width: 960px) {
  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 1.55fr) minmax(270px, 0.85fr);
    align-items: end;
  }
}

/* ---------- 章节外壳 ---------- */
.page-about .about-chapter {
  margin-top: clamp(26px, 4.4vw, 52px);
}

.page-about .about-chapter:first-of-type {
  margin-top: clamp(38px, 6vw, 78px);
}

.page-about .about-chapter__card {
  position: relative;
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(24px, 3.6vw, 52px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-chapter__card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(61, 240, 208, 0) 74%);
}

.page-about .about-chapter--teal .about-chapter__card {
  background:
    linear-gradient(168deg, rgba(61, 240, 208, 0.07), transparent 50%),
    var(--teal);
}

.page-about .about-chapter--indigo .about-chapter__card {
  background:
    linear-gradient(198deg, rgba(61, 240, 208, 0.06), transparent 52%),
    var(--indigo);
}

.page-about .about-chapter--wine .about-chapter__card {
  background:
    linear-gradient(162deg, rgba(255, 110, 110, 0.09), transparent 52%),
    var(--wine);
}

.page-about .about-chapter--plain {
  margin-top: clamp(30px, 5vw, 60px);
}

@media (min-width: 900px) {
  .page-about .about-chapter__card {
    grid-template-columns: 148px minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 章节左侧窄栏 ---------- */
.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-rail__num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(61, 240, 208, 0.32);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-rail__num:hover,
.page-about .about-rail__num:focus-visible {
  color: var(--cyan);
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-h) + 22px);
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

/* ---------- 章节正文 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
  min-width: 0;
}

.page-about .about-body .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 33px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text);
  max-width: 27ch;
}

.page-about .about-body .prose {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.84;
}

/* ---------- 四类资料卡片 ---------- */
.page-about .about-grid {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .about-card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: rgba(4, 16, 28, 0.55);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-card:hover {
  transform: translateY(-2px);
  border-color: rgba(61, 240, 208, 0.45);
}

.page-about .about-card__index {
  font-family: var(--font-numeric);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-card .card-title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

@media (min-width: 640px) {
  .page-about .about-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 发展时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 6px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--cyan), rgba(61, 240, 208, 0.1));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: var(--r-pill);
  background: var(--abyss);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 240, 208, 0.12);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-timeline__mark {
  display: inline-block;
  padding: 2px 11px;
  border: 1px solid rgba(255, 162, 75, 0.42);
  border-radius: var(--r-pill);
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber);
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-timeline__body {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}

.page-about .about-timeline__stage {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-timeline__body .card-title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--cyan);
}

.page-about .about-timeline__item:hover .about-timeline__mark,
.page-about .about-timeline__item:focus-within .about-timeline__mark {
  color: var(--abyss);
  background: var(--amber);
  border-color: var(--amber);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-split__text,
.page-about .about-split__media {
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--r-card);
  border: 1px solid var(--line);
  overflow: hidden;
  background: rgba(4, 16, 28, 0.6);
}

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

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: clamp(26px, 3.4vw, 44px);
  }

  .page-about .about-split--team {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-split--team > .about-split__media {
    order: -1;
  }
}

/* ---------- 处理流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: rgba(4, 16, 28, 0.5);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-flow__item:hover {
  border-color: rgba(61, 240, 208, 0.42);
}

.page-about .about-flow__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(61, 240, 208, 0.5);
  background: rgba(61, 240, 208, 0.09);
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-flow__item h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__row {
  display: grid;
  gap: 9px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-crew__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-crew__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-crew__role {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-crew__count {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-bar {
  display: block;
  height: 8px;
  border-radius: var(--r-pill);
  background: rgba(30, 60, 82, 0.95);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: width 0.24s var(--ease);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 分类标签 ---------- */
.page-about .about-tags {
  display: grid;
  gap: 22px;
  margin-top: 4px;
}

.page-about .about-taggroup__title {
  margin: 0 0 11px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

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

.page-about .about-tag {
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(4, 16, 28, 0.55);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tag:hover {
  color: var(--mint);
  border-color: rgba(169, 245, 228, 0.45);
}

@media (min-width: 760px) {
  .page-about .about-tags {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .about-partner {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: rgba(4, 16, 28, 0.5);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-partner:hover {
  transform: translateY(-2px);
  border-color: rgba(61, 240, 208, 0.42);
}

.page-about .about-partner__num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(61, 240, 208, 0.55);
}

.page-about .about-partner .card-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 收束入口 ---------- */
.page-about .about-next {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(200deg, rgba(255, 162, 75, 0.08), transparent 56%),
    rgba(11, 44, 59, 0.72);
}

.page-about .about-next__head .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text);
  max-width: 24ch;
}

.page-about .about-next__head .prose {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: rgba(4, 16, 28, 0.58);
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(61, 240, 208, 0.5);
  background: rgba(61, 240, 208, 0.07);
}

.page-about .about-next__label {
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 680px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-partner,
  .page-about .about-next__link,
  .page-about .about-flow__item,
  .page-about .about-rail__num,
  .page-about .about-timeline__mark,
  .page-about .about-bar__fill {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-partner:hover,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}