.page-about {
  --about-dim: rgba(242, 248, 250, 0.72);
  --about-line: rgba(34, 224, 214, 0.16);
  --about-panel: var(--deep-800);
  position: relative;
  color: var(--mist-050);
  background:
    radial-gradient(95% 62% at 86% -10%, rgba(34, 224, 214, 0.16), transparent 62%),
    radial-gradient(70% 50% at -8% 34%, rgba(15, 181, 201, 0.1), transparent 70%),
    linear-gradient(180deg, var(--deep-900) 0%, var(--abyss-950) 58%, var(--deep-900) 100%);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(102deg, rgba(34, 224, 214, 0.05) 0 1px, transparent 1px 88px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 46%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 46%);
}

.page-about > section,
.page-about > .about-shell {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 4vw, 44px) 0 clamp(44px, 7vw, 92px);
}

.page-about .ly-breadcrumb,
.page-about .ly-breadcrumb a {
  color: var(--about-dim);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  margin-top: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__copy .ly-h1 {
  font-size: clamp(2.1rem, 5.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  text-wrap: balance;
}

.page-about .about-hero__copy .ly-lede {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.78;
  max-width: 60ch;
  color: var(--mist-050);
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-dim);
  padding-left: 16px;
  border-left: 2px solid var(--cyan-600);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

/* ---------- 首屏数据牌 ---------- */
.page-about .about-plate {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-l);
  border: 1px solid var(--deep-700);
  background:
    repeating-linear-gradient(-6deg, rgba(34, 224, 214, 0.07) 0 1px, transparent 1px 24px),
    linear-gradient(160deg, var(--deep-800), var(--abyss-950));
  overflow: hidden;
}

.page-about .about-plate__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--about-dim);
}

.page-about .about-plate__ver {
  margin: 6px 0 18px;
  font-size: clamp(3rem, 9vw, 4.6rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan-400);
}

.page-about .about-plate__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-plate__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 9px;
  border-bottom: 1px dashed rgba(34, 224, 214, 0.18);
  font-size: 14px;
  color: var(--about-dim);
}

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

.page-about .about-plate__list strong {
  font-size: 18px;
  color: var(--mist-050);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(30px, 5vw, 58px);
  padding-bottom: clamp(56px, 9vw, 110px);
  align-items: start;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--about-dim);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  gap: 8px;
  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: baseline;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--deep-700);
  background: rgba(10, 39, 64, 0.7);
  color: var(--about-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-index__list a .ly-num {
  font-size: 11px;
  color: var(--cyan-400);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--mist-050);
  border-color: var(--cyan-600);
  transform: translateY(-2px);
}

.page-about .about-index__cta {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(42px, 6vw, 76px);
  min-width: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 18px;
  margin-bottom: 18px;
  border-top: 1px solid var(--about-line);
  transition: border-color 0.3s var(--ease);
}

.page-about .about-chapter:target .about-chapter__head {
  border-top-color: var(--coral-500);
}

.page-about .about-chapter__no {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
}

.page-about .about-chapter__head .ly-h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3.2vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .about-chapter__lead {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-dim);
}

.page-about .ly-prose {
  max-width: 66ch;
}

.page-about .ly-prose p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist-050);
}

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

/* ---------- 面板 ---------- */
.page-about .about-panel {
  border-radius: var(--r-l);
  padding: clamp(20px, 3.6vw, 38px);
  border: 1px solid var(--deep-700);
  background: var(--about-panel);
}

.page-about .about-panel--mist {
  background: var(--mist-050);
  border-color: rgba(11, 27, 38, 0.08);
  color: var(--ink-900);
}

.page-about .about-panel--mist .ly-eyebrow {
  color: #0a6c78;
}

.page-about .about-panel--mist a {
  color: #0a6c78;
}

.page-about .about-panel--soft {
  background: linear-gradient(155deg, var(--deep-800), rgba(4, 18, 30, 0.92));
}

.page-about .about-panel__lead {
  margin: 10px 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-600);
  max-width: 58ch;
}

.page-about .about-panel__foot {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(11, 27, 38, 0.12);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-600);
}

/* ---------- 内容体系 ---------- */
.page-about .about-structure {
  display: grid;
  gap: clamp(22px, 3.6vw, 34px);
}

.page-about .about-structure__figure {
  order: -1;
  margin: 0;
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-streams {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-streams li {
  padding-top: 14px;
  border-top: 2px solid rgba(11, 27, 38, 0.14);
}

.page-about .about-streams .ly-tag {
  color: #0a6c78;
  border-color: rgba(10, 108, 120, 0.34);
}

.page-about .about-streams .ly-h3 {
  margin: 8px 0 6px;
  font-size: 1.08rem;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .about-streams p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-600);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3.6vw, 34px);
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-m);
  overflow: hidden;
}

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

.page-about .about-metric {
  padding: 16px 14px;
  border-radius: var(--r-m);
  border: 1px solid var(--deep-700);
  background: rgba(10, 39, 64, 0.72);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-metric__num {
  display: block;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: -0.02em;
}

.page-about .about-metric__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--about-dim);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-version__figure {
  margin: 0 0 clamp(24px, 4vw, 34px);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400), var(--deep-700) 78%, transparent);
}

.page-about .about-node {
  position: relative;
  margin-bottom: 14px;
  transition: transform 0.24s var(--ease);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--deep-900);
  border: 2px solid var(--cyan-400);
}

.page-about .about-node--current::before {
  background: var(--coral-500);
  border-color: var(--coral-500);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, 0.16);
}

.page-about .about-node details {
  border: 1px solid var(--deep-700);
  border-radius: var(--r-m);
  background: rgba(10, 39, 64, 0.66);
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-node details[open] {
  border-color: rgba(34, 224, 214, 0.42);
  background: rgba(10, 39, 64, 0.92);
}

.page-about .about-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan-400);
  line-height: 1;
}

.page-about .about-node details[open] summary::after {
  content: "–";
}

.page-about .about-node__ver {
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(34, 224, 214, 0.12);
  color: var(--cyan-400);
}

.page-about .about-node--current .about-node__ver {
  background: rgba(255, 107, 74, 0.16);
  color: var(--coral-300);
}

.page-about .about-node__title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--mist-050);
}

.page-about .about-node__body {
  padding: 0 16px 16px;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-dim);
}

/* ---------- 运营节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-rhythm li {
  padding-left: 16px;
  border-left: 2px solid rgba(34, 224, 214, 0.34);
}

.page-about .about-rhythm .ly-h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
  line-height: 1.4;
}

.page-about .about-rhythm p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--about-dim);
}

.page-about .about-rhythm a {
  color: var(--cyan-400);
  text-underline-offset: 3px;
}

/* ---------- 备案信息 ---------- */
.page-about .about-identity {
  padding: clamp(22px, 3.6vw, 36px);
  border-radius: var(--r-l);
  border: 1px solid var(--deep-700);
  background:
    repeating-linear-gradient(-6deg, rgba(34, 224, 214, 0.07) 0 1px, transparent 1px 26px),
    var(--abyss-950);
}

.page-about .about-idlist {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-idlist > div {
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(34, 224, 214, 0.16);
}

.page-about .about-idlist > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-idlist dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--about-dim);
  margin-bottom: 5px;
}

.page-about .about-idlist dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist-050);
  overflow-wrap: anywhere;
}

.page-about .about-identity__note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-identity__note a {
  color: var(--cyan-400);
  text-underline-offset: 3px;
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-streams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-structure {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-structure__figure {
    order: 0;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

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

  .page-about .about-metric:nth-child(even) {
    transform: translateY(20px);
  }

  .page-about .about-node:nth-child(even) {
    margin-left: 34px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-node::before {
    left: -33px;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: minmax(170px, 208px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
  }

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

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    margin-bottom: 24px;
    border-left: 1px solid var(--deep-700);
  }

  .page-about .about-index__list a {
    width: 100%;
    border: 0;
    border-radius: 0 8px 8px 0;
    background: transparent;
    padding: 9px 12px;
    font-size: 13.5px;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    background: rgba(34, 224, 214, 0.08);
    transform: translateX(3px);
  }

  .page-about .about-index__cta {
    display: inline-flex;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3.6fr);
    gap: 64px;
  }

  .page-about .about-rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-metric,
  .page-about .about-node,
  .page-about .about-chapter__head {
    transition: none;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible,
  .page-about .about-metric:nth-child(even) {
    transform: none;
  }
}
<<<END>>>