.page-about {
  position: relative;
  display: block;
  padding-bottom: 88px;
  background: var(--by-void);
  color: var(--by-text);
  font-family: var(--by-font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 56px;
  border-bottom: 1px solid var(--by-line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -40%;
  width: 52%;
  height: 190%;
  background: linear-gradient(112deg, transparent 43%, rgba(255, 46, 139, 0.16) 50%, transparent 57%);
  pointer-events: none;
}

.page-about .about-hero > .by-container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 26px;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-size: clamp(44px, 10vw, 116px);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.03em;
  color: var(--by-text);
}

.page-about .about-hero__lead h1 em {
  font-style: normal;
  color: var(--by-hot);
}

.page-about .by-lede {
  max-width: 60ch;
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--by-muted);
}

.page-about .hero-panel {
  border: var(--by-border);
  background: var(--by-surface);
  box-shadow: var(--by-shadow-hard);
  padding: 22px 20px;
}

.page-about .hero-panel__label {
  margin: 0 0 6px;
  font-family: var(--by-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--by-ice);
}

.page-about .hero-panel__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--by-text);
}

.page-about .hero-panel .by-rule {
  display: block;
  margin: 18px 0;
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-top: 56px;
}

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

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--by-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--by-muted);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--by-line);
  background: var(--by-surface);
  color: var(--by-muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.24s var(--by-ease), border-color 0.24s var(--by-ease);
}

.page-about .about-index__no {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--by-ice);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--by-text);
  border-color: var(--by-ice);
}

.page-about .about-index__list a[aria-current="true"] {
  color: var(--by-text);
  border-color: var(--by-cyan);
}

.page-about .about-index__list a[aria-current="true"] .about-index__no {
  color: var(--by-cyan);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 72px;
  min-width: 0;
}

/* ---------- 章节题头 ---------- */
.page-about .about-section {
  scroll-margin-top: 96px;
}

.page-about .about-section .by-section__head {
  align-items: flex-start;
  margin-bottom: 28px;
}

.page-about .about-section__titleWrap {
  min-width: 0;
}

.page-about .about-section .by-section__title {
  margin: 6px 0 0;
}

/* ---------- 概览数字带 ---------- */
.page-about .scale-media {
  margin: 0 0 24px;
}

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

.page-about .scale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--by-line);
  border: 1px solid var(--by-line);
}

.page-about .scale-cell {
  position: relative;
  padding: 22px 20px 42px;
  background: var(--by-surface);
}

.page-about .scale-cell__num {
  display: inline-block;
  font-family: var(--by-font-mono);
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--by-ice);
}

.page-about .scale-cell__num--hot {
  color: var(--by-hot);
}

.page-about .scale-cell__unit {
  margin-left: 8px;
  font-family: var(--by-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--by-muted);
}

.page-about .scale-cell__label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--by-muted);
}

.page-about .scale-cell__coord {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--by-line);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 36px 42px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 15px;
  width: 11px;
  height: 11px;
  background: var(--by-cyan);
  box-shadow: 0 0 0 4px var(--by-void), 0 0 0 5px var(--by-line);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: var(--by-ice);
  opacity: 0.4;
}

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

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

.page-about .tl-year {
  display: block;
  font-family: var(--by-font-mono);
  font-size: clamp(28px, 7vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--by-ice);
}

.page-about .tl-title {
  margin: 10px 0 8px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--by-text);
}

.page-about .tl-text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--by-muted);
}

/* ---------- 八个分类 ---------- */
.page-about .cat-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

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

.page-about .stack {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--by-line);
  background: var(--by-line);
}

.page-about .stack__floor {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 16px;
  background: var(--by-surface);
}

.page-about .stack__floor--3 {
  border-left: 6px solid var(--by-violet);
}

.page-about .stack__floor--2 {
  border-left: 6px solid var(--by-cyan);
}

.page-about .stack__floor--1 {
  border-left: 6px solid var(--by-ice);
}

.page-about .stack__idx {
  flex: 0 0 auto;
  font-family: var(--by-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--by-text);
}

.page-about .stack__name {
  font-size: 14px;
  line-height: 1.6;
  color: var(--by-muted);
}

.page-about .cat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cat-card {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--by-line);
  background: var(--by-surface);
  transition: border-color 0.26s var(--by-ease), transform 0.26s var(--by-ease);
}

.page-about .cat-card:hover {
  border-color: var(--by-cyan);
  transform: translateY(-4px);
}

.page-about .cat-card__idx {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--by-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--by-line);
}

.page-about .cat-card__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--by-text);
}

.page-about .cat-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--by-muted);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

.page-about .team-copy__lead {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--by-text);
}

.page-about .team-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--by-line);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--by-line);
}

.page-about .team-row__k {
  font-family: var(--by-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--by-ice);
}

.page-about .team-row__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--by-muted);
}

/* ---------- 本地合作 ---------- */
.page-about .roots-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .roots-block {
  position: relative;
  padding: 26px 22px 24px;
  border: var(--by-border);
  background: var(--by-surface);
  overflow: hidden;
}

.page-about .roots-block--hot {
  box-shadow: 12px 12px 0 rgba(255, 46, 139, 0.22);
}

.page-about .roots-block--cyan {
  box-shadow: 12px 12px 0 rgba(0, 240, 224, 0.18);
}

.page-about .roots-block--ice {
  box-shadow: 12px 12px 0 rgba(127, 212, 255, 0.18);
}

.page-about .roots-block__num {
  display: block;
  font-family: var(--by-font-mono);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--by-text);
}

.page-about .roots-block--hot .roots-block__num {
  color: var(--by-hot);
}

.page-about .roots-block--cyan .roots-block__num {
  color: var(--by-cyan);
}

.page-about .roots-block__title {
  margin: 14px 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--by-text);
}

.page-about .roots-block__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--by-muted);
}

/* ---------- 荣誉 ---------- */
.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .honor-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--by-line);
}

.page-about .honor-item:last-child {
  border-bottom: 1px solid var(--by-line);
}

.page-about .honor-item__year {
  font-family: var(--by-font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--by-cyan);
}

.page-about .honor-item__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--by-text);
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .next-card {
  display: block;
  padding: 28px 22px 26px;
  border: var(--by-border);
  background: var(--by-surface);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.28s var(--by-ease), transform 0.28s var(--by-ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--by-cyan);
  transform: translateY(-4px);
}

.page-about .next-card--hot:hover,
.page-about .next-card--hot:focus-visible {
  border-color: var(--by-hot);
}

.page-about .next-card__idx {
  display: block;
  font-family: var(--by-font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--by-ice);
}

.page-about .next-card__title {
  margin: 12px 0 10px;
  font-size: 21px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--by-text);
}

.page-about .next-card__text {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--by-muted);
}

.page-about .next-card__nowrap {
  font-family: var(--by-font-mono);
  font-size: 14px;
  color: var(--by-ice);
  word-break: break-all;
}

.page-about .next-card__go {
  display: inline-block;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--by-hot);
  font-family: var(--by-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--by-text);
}

.page-about .next-aside {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--by-muted);
}

.page-about .next-aside a {
  color: var(--by-ice);
  text-decoration: none;
  border-bottom: 1px solid var(--by-line);
}

.page-about .next-aside a:hover,
.page-about .next-aside a:focus-visible {
  border-bottom-color: var(--by-cyan);
}

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

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

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

  .page-about .roots-block--ice {
    grid-column: 1 / -1;
  }

  .page-about .honor-item {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }

  .page-about .team-row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 36px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
    margin-top: 34px;
  }

  .page-about .about-hero__side {
    padding-top: 76px;
  }

  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 64px;
    padding-top: 72px;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__list a {
    width: 100%;
    padding: 9px 10px;
    border-color: transparent;
    border-left: 2px solid var(--by-line);
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-color: transparent;
    border-left-color: var(--by-ice);
  }

  .page-about .about-index__list a[aria-current="true"] {
    border-color: transparent;
    border-left-color: var(--by-cyan);
    background: rgba(0, 240, 224, 0.06);
  }

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

  .page-about .cat-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 28px;
    align-items: stretch;
  }

  .page-about .cat-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .roots-block--ice {
    grid-column: auto;
  }

  .page-about .next-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}
<<<END>>>