.page-about {
  background-color: var(--mb-night);
  color: var(--mb-cream);
  display: block;
  overflow-x: clip;
}

.page-about .crumbnav {
  padding-top: 18px;
  font-size: 13px;
  color: var(--mb-line);
}

.page-about .crumbnav a {
  color: var(--mb-cyan);
  text-decoration: none;
}

.page-about .crumbnav a:hover,
.page-about .crumbnav a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--mb-shadow);
  border-bottom-left-radius: var(--mb-radius-lg);
  border-bottom-right-radius: var(--mb-radius-lg);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.36;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 96% at 10% 16%, rgba(11, 43, 36, 0.94) 0%, rgba(11, 43, 36, 0.6) 48%, rgba(7, 26, 21, 0.3) 100%),
    linear-gradient(180deg, rgba(11, 43, 36, 0.1) 0%, rgba(7, 26, 21, 0.92) 100%);
}

.page-about .about-hero__body {
  position: relative;
  z-index: 2;
  padding-top: clamp(34px, 7vw, 78px);
  padding-bottom: clamp(30px, 6vw, 70px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(31px, 7.2vw, 62px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mb-white);
}

.page-about .about-hero__lead {
  max-width: 64ch;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.86);
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border-radius: var(--mb-radius-md);
  background-color: rgba(20, 69, 58, 0.74);
  border: 1px solid rgba(50, 224, 196, 0.18);
}

.page-about .about-fact__num {
  font-family: var(--mb-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1;
  color: var(--mb-amber);
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(242, 239, 230, 0.78);
}

/* ---------- 主布局 ---------- */

.page-about .about-deck {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(32px, 6vw, 72px);
  padding-bottom: clamp(28px, 5vw, 60px);
}

.page-about .about-rail {
  position: static;
}

.page-about .about-rail .rail__title {
  margin: 0;
  font-family: var(--mb-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--mb-line);
}

.page-about .about-rail .rail__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-rail .rail__link {
  display: block;
  padding: 8px 14px;
  border-radius: var(--mb-pill);
  border: 1px solid rgba(47, 107, 84, 0.62);
  background-color: rgba(20, 69, 58, 0.55);
  color: var(--mb-cream);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s var(--mb-ease), color 0.25s var(--mb-ease), background-color 0.25s var(--mb-ease);
}

.page-about .about-rail .rail__link:hover,
.page-about .about-rail .rail__link:focus-visible {
  border-color: var(--mb-cyan);
  color: var(--mb-cyan);
}

.page-about .about-rail .rail__link[aria-current="true"] {
  border-color: var(--mb-cyan);
  background-color: rgba(50, 224, 196, 0.12);
  color: var(--mb-cyan);
}

/* ---------- 面板堆叠 ---------- */

.page-about .about-stack {
  display: grid;
  gap: 2px;
  background-color: rgba(255, 255, 255, 0.13);
  border-radius: var(--mb-radius-lg);
  overflow: hidden;
}

.page-about .about-panel {
  position: relative;
  border-radius: 0;
  background-color: var(--mb-moss);
  padding: clamp(24px, 4.4vw, 46px) clamp(20px, 4vw, 48px);
  scroll-margin-top: 96px;
}

.page-about .about-panel--seed {
  background-color: #14453A;
}

.page-about .about-panel--code {
  background-color: #103C32;
}

.page-about .about-panel--time {
  background-color: #0E352C;
}

.page-about .about-panel--team {
  background-color: #14453A;
}

.page-about .about-panel--partners {
  background-color: #103C32;
}

.page-about .about-panel--entity {
  background-color: #0A2C25;
}

.page-about .about-panel__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-panel__head .panel__index {
  margin: 0;
  font-family: var(--mb-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--mb-amber);
}

.page-about .about-panel__head .panel__title {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 30px);
  font-weight: 750;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--mb-cream);
}

.page-about .about-panel__body p {
  max-width: 68ch;
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.82);
}

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

.page-about .about-note {
  display: none;
  position: absolute;
  left: 18px;
  top: clamp(28px, 4vw, 52px);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--mb-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  color: rgba(50, 224, 196, 0.5);
  white-space: nowrap;
}

/* ---------- 编号结构 ---------- */

.page-about .about-anatomy {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-anatomy__seg {
  padding: 18px 18px 16px;
  border-radius: var(--mb-radius-md);
  background-color: rgba(7, 26, 21, 0.46);
  border: 1px solid rgba(50, 224, 196, 0.18);
}

.page-about .about-anatomy__tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--mb-pill);
  background-color: rgba(181, 100, 60, 0.22);
  border: 1px solid rgba(181, 100, 60, 0.52);
  color: #E9B08E;
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.page-about .about-anatomy__figure {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 12px 0 0;
}

.page-about .about-anatomy__num {
  font-family: var(--mb-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  color: var(--mb-amber);
}

.page-about .about-anatomy__unit {
  font-size: 13px;
  color: rgba(242, 239, 230, 0.6);
}

.page-about .about-anatomy__desc {
  max-width: none;
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.62;
  color: rgba(242, 239, 230, 0.72);
}

/* ---------- 版本时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  isolation: isolate;
  margin-top: 26px;
  padding: 24px 0 4px;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--mb-radius-md);
  opacity: 0.16;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-tl {
  position: relative;
  padding-left: 28px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  bottom: -22px;
  width: 1px;
  background: linear-gradient(180deg, rgba(50, 224, 196, 0.6), rgba(50, 224, 196, 0.04));
}

.page-about .about-tl:last-child::before {
  display: none;
}

.page-about .about-tl__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--mb-night);
  border: 2px solid var(--mb-cyan);
  box-shadow: 0 0 0 4px rgba(50, 224, 196, 0.12);
}

.page-about .about-tl__era {
  max-width: none;
  margin: 0;
  font-family: var(--mb-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mb-line);
}

.page-about .about-tl__era .num {
  font-weight: 800;
  color: var(--mb-amber);
}

.page-about .about-tl__title {
  margin: 6px 0 6px;
  font-size: clamp(16px, 2.4vw, 19px);
  font-weight: 700;
  line-height: 1.36;
  color: var(--mb-cream);
}

.page-about .about-tl__desc {
  max-width: 64ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(242, 239, 230, 0.75);
}

/* ---------- 团队 ---------- */

.page-about .about-panel__body--split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  gap: 2px;
  margin: 22px 0 0;
  padding: 0;
  background-color: rgba(255, 255, 255, 0.12);
  border-radius: var(--mb-radius-md);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 16px;
  background-color: rgba(7, 26, 21, 0.58);
}

.page-about .about-stats .num {
  flex: 0 0 auto;
  min-width: 6.4ch;
  font-family: var(--mb-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 800;
  line-height: 1;
  color: var(--mb-amber);
}

.page-about .about-stats li > span:last-child {
  font-size: 13.5px;
  line-height: 1.55;
  color: rgba(242, 239, 230, 0.78);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--mb-radius-md);
  overflow: hidden;
  border: 1px solid rgba(47, 107, 84, 0.5);
  background-color: rgba(7, 26, 21, 0.4);
}

.page-about .about-team__figure .frame__media {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__figure .frame__cap {
  margin: 0;
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(242, 239, 230, 0.66);
}

/* ---------- 生态 ---------- */

.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-eco__item {
  padding: 16px 18px;
  border-radius: var(--mb-radius-md);
  border: 1px solid rgba(47, 107, 84, 0.52);
  background-color: rgba(7, 26, 21, 0.4);
}

.page-about .about-eco__item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--mb-cyan);
}

.page-about .about-eco__item p {
  max-width: none;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.66;
  color: rgba(242, 239, 230, 0.75);
}

/* ---------- 主体信息 ---------- */

.page-about .about-legal {
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background-color: rgba(255, 255, 255, 0.12);
  border-radius: var(--mb-radius-md);
  overflow: hidden;
}

.page-about .about-legal__row {
  display: grid;
  gap: 4px;
  padding: 14px 18px;
  background-color: rgba(7, 26, 21, 0.6);
}

.page-about .about-legal__row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(242, 239, 230, 0.55);
}

.page-about .about-legal__row dd {
  margin: 0;
  font-size: 15px;
  font-weight: 650;
  color: var(--mb-cream);
}

.page-about .about-legal__row dd.num {
  font-family: var(--mb-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--mb-amber);
}

.page-about .about-legal__row dd a {
  color: var(--mb-cyan);
  text-decoration: none;
}

.page-about .about-legal__row dd a:hover,
.page-about .about-legal__row dd a:focus-visible {
  text-decoration: underline;
}

/* ---------- 相关入口 ---------- */

.page-about .about-next {
  padding-top: clamp(8px, 2vw, 20px);
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about .about-next__list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin: 0;
  padding: 0;
  background-color: rgba(255, 255, 255, 0.12);
  border-radius: var(--mb-radius-lg);
  overflow: hidden;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 20px 22px;
  background-color: rgba(20, 69, 58, 0.9);
  color: inherit;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background-color 0.25s var(--mb-ease), border-color 0.25s var(--mb-ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background-color: rgba(28, 88, 74, 0.95);
  border-left-color: var(--mb-cyan);
}

.page-about .about-next__link span:first-child {
  font-size: 16px;
  font-weight: 700;
  color: var(--mb-cream);
}

.page-about .about-next__link span:last-child {
  font-size: 13px;
  line-height: 1.55;
  color: rgba(242, 239, 230, 0.68);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-note {
    display: block;
  }

  .page-about .about-panel {
    padding-left: clamp(62px, 6.5vw, 98px);
  }

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

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

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

@media (min-width: 820px) {
  .page-about .about-panel__body--split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-legal__row {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-deck {
    grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail .rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-about .about-rail .rail__link {
    border-radius: var(--mb-radius-sm);
    white-space: normal;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail .rail__link,
  .page-about .about-next__link {
    transition: none;
  }
}