.page-about {
  --about-rail-w: 214px;
  background: var(--night);
  color: var(--cold);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 42px;
  background: linear-gradient(180deg, var(--night) 0%, var(--board) 100%);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -26%;
  width: 82%;
  height: 154%;
  background: linear-gradient(155deg, rgba(55, 160, 107, 0.5), rgba(30, 122, 78, 0) 72%);
  clip-path: polygon(36% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__body {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .about-hero h1 {
  font-size: clamp(32px, 8.2vw, 64px);
  line-height: 1.04;
  margin: 12px 0 16px;
  color: var(--white);
}

.page-about .about-hero .lead {
  max-width: 34em;
  font-size: clamp(16px, 4.2vw, 21px);
  line-height: 1.62;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  border-top: 1px solid var(--hairline);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 6vw, 30px);
  line-height: 1;
  color: var(--ice);
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(245, 248, 246, 0.7);
}

.page-about .about-hero__badge {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 24px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ice);
}

/* ---------- 索引 + 长页布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 22px;
  align-items: start;
  padding-top: 28px;
  padding-bottom: 12px;
}

.page-about .about-rail {
  padding: 12px 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(159, 211, 206, 0.7);
}

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

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 11px 8px 9px;
  border-left: 2px solid transparent;
  color: rgba(245, 248, 246, 0.72);
  font-size: 13.5px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-left-color: var(--turf-2);
  background: var(--glass);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--turf-2);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding: 30px 0 34px;
  border-top: 1px solid var(--hairline);
  scroll-margin-top: 104px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-chapter__title {
  font-size: clamp(25px, 5.6vw, 40px);
  line-height: 1.1;
  margin: 10px 0 14px;
  color: var(--white);
}

.page-about .about-chapter__lead {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.72;
  color: rgba(245, 248, 246, 0.82);
  max-width: 36em;
}

.page-about .about-split {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

.page-about .about-body {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 248, 246, 0.82);
  max-width: 38em;
}

.page-about .about-link {
  color: var(--turf-2);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.page-about .about-next {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.page-about .about-next a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 3px;
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--turf-2);
}

/* ---------- 角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  padding: 16px 16px 18px;
  border: 1px solid var(--hairline);
  background: var(--glass);
  border-top: 2px solid var(--turf);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1;
  color: var(--turf-2);
}

.page-about .about-role__title {
  font-size: 19px;
  margin: 8px 0 8px;
  color: var(--white);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(245, 248, 246, 0.78);
}

/* ---------- 亮区章节 ---------- */
.page-about .about-chapter--light {
  background: var(--cold);
  color: var(--text);
  border-radius: 2px;
  border-top: 0;
  padding: 26px 20px 30px;
  margin: 26px 0;
}

.page-about .about-chapter--light .section-label {
  color: var(--slate);
}

.page-about .about-chapter--light .about-chapter__title {
  color: var(--text);
}

.page-about .about-chapter--light .about-chapter__lead {
  color: var(--slate);
}

.page-about .about-chapter--light .about-body {
  color: #22333d;
}

.page-about .about-chapter--light .about-link {
  color: var(--turf);
}

.page-about .about-chapter--light .about-link:hover,
.page-about .about-chapter--light .about-link:focus-visible {
  color: var(--turf-2);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 20px 0 0;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--line);
  display: grid;
  gap: 20px;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--turf);
  box-shadow: 0 0 0 4px rgba(30, 122, 78, 0.16);
}

.page-about .about-timeline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--turf);
  margin-bottom: 5px;
}

.page-about .about-timeline__title {
  font-size: 19px;
  margin: 0 0 5px;
  color: var(--text);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
  max-width: 40em;
}

/* ---------- 校对 ---------- */
.page-about .about-checks {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-check {
  padding: 18px 16px;
  border: 1px solid var(--hairline);
  background: var(--glass);
}

.page-about .about-check__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--turf-2);
}

.page-about .about-check__title {
  font-size: 19px;
  margin: 8px 0 7px;
  color: var(--white);
}

.page-about .about-check p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(245, 248, 246, 0.78);
}

.page-about .about-callout {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--amber);
  background: rgba(224, 138, 46, 0.1);
  font-size: 15px;
  line-height: 1.72;
  color: var(--cold);
  max-width: 42em;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-partner {
  padding: 18px 16px 20px;
  border: 1px solid var(--hairline);
  background: linear-gradient(158deg, rgba(30, 122, 78, 0.24), rgba(19, 41, 59, 0.42));
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(28px, 7vw, 42px);
  line-height: 1;
  color: var(--ice);
}

.page-about .about-partner__title {
  font-size: 18px;
  margin: 8px 0 8px;
  color: var(--white);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(245, 248, 246, 0.8);
}

/* ---------- 归档 ---------- */
.page-about .about-chapter--band {
  border-top: 1px solid var(--hairline);
  padding-top: 30px;
}

.page-about .about-band__media {
  margin: 20px 0 0;
  border: 1px solid var(--hairline);
}

.page-about .about-stats {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  padding: 16px 14px;
  background: var(--glass);
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--ice);
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 7vw, 42px);
  line-height: 1;
  color: var(--white);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .about-stat__more {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.66;
  color: rgba(245, 248, 246, 0.76);
}

/* ---------- 版本 ---------- */
.page-about .about-version {
  margin-top: 20px;
  display: grid;
  gap: 18px;
}

.page-about .about-version__badge {
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--white);
  border-left: 3px solid var(--turf);
}

.page-about .about-version__note {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--slate);
}

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

.page-about .about-version__list li {
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-version__list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 30px;
  padding: 40px 0 48px;
  background: var(--board);
  border-top: 1px solid var(--hairline);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: -18%;
  bottom: -60%;
  width: 70%;
  height: 160%;
  background: linear-gradient(20deg, rgba(30, 122, 78, 0.42), rgba(30, 122, 78, 0) 70%);
  clip-path: polygon(0 0, 100% 18%, 62% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 22px;
}

.page-about .about-cta__title {
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1.14;
  color: var(--white);
  margin: 10px 0 12px;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 248, 246, 0.82);
  max-width: 40em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 30px 0 52px;
  }

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

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

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

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

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

  .page-about .about-chapter--light {
    padding: 32px 30px 36px;
    margin: 30px 0;
  }

  .page-about .about-version {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 26px;
    align-items: start;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
    gap: 32px;
  }

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

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 50px;
    padding-top: 42px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 100px;
    border: 0;
    border-left: 1px solid var(--hairline);
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__title {
    padding-left: 10px;
  }

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

  .page-about .about-rail__link {
    padding: 9px 12px 9px 10px;
  }

  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 44px;
    margin-top: 32px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
    gap: 16px;
    border-top: 0;
    border-left: 1px solid var(--hairline);
    padding: 2px 0 2px 22px;
  }

  .page-about .about-chapter {
    padding: 36px 0 42px;
  }
}

@media (hover: hover) and (min-width: 820px) {
  .page-about .about-stat__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
  }

  .page-about .about-stat:hover .about-stat__more,
  .page-about .about-stat:focus-within .about-stat__more,
  .page-about .about-stat:focus .about-stat__more {
    max-height: 120px;
    opacity: 1;
    margin-top: 10px;
  }

  .page-about .about-stat {
    transition: border-left-color 0.25s var(--ease), background 0.25s var(--ease);
  }

  .page-about .about-stat:hover,
  .page-about .about-stat:focus {
    border-left-color: var(--turf-2);
    background: rgba(255, 255, 255, 0.16);
    outline: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-stat,
  .page-about .about-stat__more {
    transition-duration: 0.01ms;
  }
}