.page-about {
  --about-index-w: 3rem;
  --about-alt: rgba(233, 241, 246, 0.74);
  --about-dim: rgba(233, 241, 246, 0.55);
  display: block;
  overflow-x: clip;
  background-color: var(--ly-navy);
  color: var(--ly-mist);
  font-family: var(--ly-font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.page-about a {
  color: var(--ly-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 232, 206, 0.35);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about a:hover {
  color: var(--ly-mist);
  border-bottom-color: var(--ly-line-strong);
}

.page-about a:focus-visible {
  outline: 2px solid var(--ly-cyan);
  outline-offset: 2px;
  border-bottom-color: transparent;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(36px, 6vw, 72px) 0 clamp(52px, 8vw, 112px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: linear-gradient(174deg, var(--ly-teal) 0 42%, var(--ly-indigo) 42% 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(198deg, rgba(4, 18, 32, 0) 24%, rgba(4, 18, 32, 0.82) 100%);
  pointer-events: none;
}

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

.page-about .about-hero .ly-breadcrumb {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 15ch;
  font-family: var(--ly-font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 6.2vw, 4.4rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ly-mist);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 30px) 0 0;
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-alt);
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--ly-line);
  font-family: var(--ly-font-label);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--about-dim);
}

.page-about .about-hero__fact-num {
  font-family: var(--ly-font-mono);
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ly-mist);
  margin-right: 4px;
}

/* ---------- 通用分节骨架 ---------- */

.page-about .about-block {
  border-top: 1px solid var(--ly-line);
  padding: clamp(40px, 7vw, 88px) 0;
}

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

.page-about .about-index {
  display: inline-block;
  font-family: var(--ly-font-mono);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--ly-mist);
  transition: color 0.5s ease;
}

.ly-js .page-about .about-block[data-reveal] .about-index {
  color: var(--ly-slate);
}

.ly-js .page-about .about-block[data-reveal].is-visible .about-index {
  color: var(--ly-mist);
}

.page-about .about-h2 {
  margin: 0 0 clamp(14px, 2.4vw, 24px);
  max-width: 26ch;
  font-family: var(--ly-font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.3;
  color: var(--ly-mist);
}

.page-about .about-text {
  margin: 0;
  max-width: 68ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--about-alt);
}

.page-about .about-text + .about-text {
  margin-top: 1.1em;
}

@media (min-width: 860px) {
  .page-about {
    --about-index-w: 4.5rem;
  }

  .page-about .about-block__inner {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
  }
}

/* ---------- 01 理念 ---------- */

.page-about .about-credos__lead {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
  max-width: 20ch;
  font-family: var(--ly-font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.8vw, 2.5rem);
  line-height: 1.42;
  color: var(--ly-mist);
}

.page-about .about-credos__lead::before {
  content: "\201C";
  display: block;
  font-family: var(--ly-font-display);
  font-size: 3.2em;
  line-height: 0.55;
  color: var(--ly-cyan);
  opacity: 0.45;
  margin-bottom: 0.12em;
}

.page-about .about-credos__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background-color: var(--ly-line);
  border: 1px solid var(--ly-line);
}

.page-about .about-credos__list li {
  padding: 18px 20px;
  background-color: var(--ly-glass);
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--about-alt);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-credos__list li:hover {
  background-color: rgba(56, 232, 206, 0.06);
  box-shadow: inset 0 0 0 1px var(--ly-line-strong);
}

.page-about .about-credos__key {
  display: inline-block;
  margin-right: 0.5em;
  font-family: var(--ly-font-label);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ly-cyan);
}

.page-about .about-credos__tail {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 62ch;
  font-family: var(--ly-font-display);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.7;
  color: var(--ly-mist);
}

/* ---------- 02 五级分类 ---------- */

.page-about .about-levels {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ly-line);
  counter-reset: none;
}

.page-about .about-levels__item {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ly-line);
  transition: box-shadow 0.3s ease;
}

.page-about .about-levels__item:hover {
  box-shadow: inset 2px 0 0 var(--ly-cyan);
}

.page-about .about-levels__tag {
  grid-row: span 3;
  padding-top: 0.35em;
  font-family: var(--ly-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ly-cyan);
}

.page-about .about-levels__name {
  margin: 0;
  font-family: var(--ly-font-display);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ly-mist);
}

.page-about .about-levels__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-alt);
}

.page-about .about-levels__fields {
  margin: 4px 0 0;
  font-family: var(--ly-font-label);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: var(--ly-slate);
}

/* ---------- 03 时间轴 ---------- */

.page-about .about-axis__chart {
  margin: clamp(26px, 4vw, 42px) 0;
  padding: clamp(20px, 3vw, 30px) clamp(18px, 3vw, 32px);
  border: 1px solid var(--ly-line);
  background-color: rgba(4, 18, 32, 0.45);
}

.page-about .about-tick {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-tick__bars line {
  stroke: var(--ly-cyan);
  stroke-width: 0.9;
  opacity: 0.4;
}

.page-about .about-tick__bars line:nth-child(n + 29) {
  stroke: var(--ly-slate);
  stroke-dasharray: 3 4;
  opacity: 0.75;
}

.page-about .about-tick__baseline {
  stroke: var(--ly-line-strong);
  stroke-width: 0.9;
}

.page-about .about-tick__scale {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-family: var(--ly-font-mono);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--ly-slate);
}

.page-about .about-tick__legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--ly-line);
  font-family: var(--ly-font-label);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--about-dim);
}

.page-about .about-tick__legend li {
  display: flex;
  align-items: center;
}

.page-about .about-tick__swatch {
  display: inline-block;
  width: 22px;
  height: 2px;
  margin-right: 9px;
  flex: none;
}

.page-about .about-tick__swatch--done {
  background-color: var(--ly-cyan);
  opacity: 0.65;
}

.page-about .about-tick__swatch--open {
  background-image: linear-gradient(90deg, var(--ly-slate) 0 45%, transparent 45% 55%, var(--ly-slate) 55% 100%);
}

.page-about .about-axis__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  max-width: 46rem;
}

.page-about .about-axis__figure .ly-media__caption,
.page-about .about-trace__figure .ly-media__caption,
.page-about .about-proof__figure .ly-media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ly-slate);
}

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

/* ---------- 04 追溯方法 ---------- */

.page-about .about-trace__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-trace__rules {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0;
  padding: 0;
  border-top: 1px solid var(--ly-line);
}

.page-about .about-trace__rules li {
  padding: 14px 0;
  border-bottom: 1px solid var(--ly-line);
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--about-alt);
}

.page-about .about-trace__rule {
  display: inline-block;
  min-width: 5.5em;
  margin-right: 0.6em;
  padding: 1px 8px;
  border: 1px solid rgba(56, 232, 206, 0.3);
  border-radius: 2px;
  font-family: var(--ly-font-label);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ly-cyan);
  vertical-align: 2px;
}

.page-about .about-trace__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-trace__cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 18rem);
    align-items: start;
  }
}

/* ---------- 05 三校流程 ---------- */

.page-about .about-table-wrap {
  margin: clamp(22px, 3vw, 34px) 0 0;
  overflow-x: auto;
  border: 1px solid var(--ly-line);
  background-color: rgba(4, 18, 32, 0.4);
}

.page-about .about-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 0.93rem;
  line-height: 1.7;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 15px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--ly-line);
}

.page-about .about-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background-color: var(--ly-navy-deep);
  font-family: var(--ly-font-label);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ly-cyan);
}

.page-about .about-table tbody th {
  font-weight: 600;
  color: var(--ly-mist);
  white-space: nowrap;
}

.page-about .about-table tbody td {
  color: var(--about-alt);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover th,
.page-about .about-table tbody tr:hover td {
  background-color: rgba(56, 232, 206, 0.04);
}

.page-about .about-table__step {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--ly-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ly-coral);
}

.page-about .about-proof__note {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-proof__sources {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-proof__sources li {
  padding: 7px 14px;
  border: 1px solid var(--ly-line);
  font-family: var(--ly-font-label);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--about-dim);
}

.page-about .about-proof__sources .ly-num {
  margin-right: 6px;
  font-size: 12px;
  color: var(--ly-cyan);
}

.page-about .about-proof__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  max-width: 34rem;
}

/* ---------- 06 团队分工 ---------- */

.page-about .about-roles {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--ly-line);
  border: 1px solid var(--ly-line);
}

.page-about .about-roles__item {
  padding: 20px;
  background-color: var(--ly-navy);
  transition: background-color 0.3s ease;
}

.page-about .about-roles__item:hover {
  background-color: rgba(25, 26, 74, 0.5);
}

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

.page-about .about-roles__name {
  margin: 0;
  font-family: var(--ly-font-display);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ly-mist);
}

.page-about .about-roles__count {
  font-size: 1.5rem;
  color: var(--ly-cyan);
  line-height: 1;
}

.page-about .about-roles__desc {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--about-alt);
}

.page-about .about-roles__power {
  margin: 12px 0 0;
  font-family: var(--ly-font-label);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ly-slate);
}

.page-about .about-roles__power--write {
  color: var(--ly-cyan);
}

@media (min-width: 800px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 07 边界与纠错 ---------- */

.page-about .about-bounds__list {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  border-top: 1px solid var(--ly-line);
}

.page-about .about-bounds__list li {
  position: relative;
  padding: 14px 0 14px 26px;
  border-bottom: 1px solid var(--ly-line);
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--about-alt);
}

.page-about .about-bounds__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35em;
  width: 12px;
  height: 1px;
  background-color: var(--ly-coral);
}

/* ---------- 结尾细线 ---------- */

.page-about .about-foot {
  padding: 0 0 clamp(48px, 7vw, 88px);
}

.page-about .about-foot .about-foot__inner {
  padding-top: 0;
}

.page-about .about-foot__rule {
  display: block;
  width: 100%;
  height: 1px;
  background-image: linear-gradient(90deg, var(--ly-cyan) 0, var(--ly-line) 22%, var(--ly-line) 100%);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-foot__links {
  margin: 0;
  font-family: var(--ly-font-label);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ly-slate);
}

.page-about .about-foot__dot {
  margin: 0 10px;
  color: var(--ly-slate);
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__lede {
    max-width: 60ch;
  }

  .page-about .about-axis__figure {
    max-width: 52rem;
  }
}