.page-about {
  --about-line: rgba(46, 74, 107, .7);
  --about-ghost: rgba(201, 216, 232, .14);
  --about-panel: rgba(14, 42, 77, .62);
  --about-glow: 0 0 0 4px rgba(41, 227, 107, .14);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1rem, 3vw, 1.75rem) 0 clamp(2.25rem, 6vw, 4rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -14% -18% auto -18%;
  height: 78%;
  background: linear-gradient(135deg, rgba(41, 227, 107, .16), rgba(23, 181, 138, .07) 44%, rgba(7, 26, 51, 0) 74%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-hero__frame {
  position: relative;
  margin: clamp(1rem, 3vw, 1.75rem) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vw, 330px);
  object-fit: cover;
}

.page-about .about-hero__frame .media-frame__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 2.4rem clamp(1rem, 2.5vw, 1.75rem) .85rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(7, 26, 51, 0), rgba(7, 26, 51, .92));
}

.page-about .about-hero__text {
  max-width: 52rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-hero__text .label-chip {
  margin-bottom: .9rem;
}

.page-about .about-hero__text h1 {
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--white);
  margin: 0 0 1rem;
}

.page-about .about-hero__lede {
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
  max-width: 44rem;
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 2.25rem;
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  padding-top: clamp(1rem, 2.5vw, 1.5rem);
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  gap: .5rem;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--green);
  line-height: 1;
}

.page-about .about-hero__unit {
  font-size: .88rem;
  color: var(--ink-dim);
}

/* ---------- 长栏与目录 ---------- */
.page-about .about-run {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-index {
  align-self: start;
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 .75rem;
}

.page-about .about-index__list {
  list-style: none;
  display: flex;
  gap: .4rem;
  margin: 0;
  padding: 0 0 .4rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .55rem .9rem;
  border-radius: var(--pill);
  border: 1px solid transparent;
  color: var(--ink-dim);
  font-size: .88rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease, background-color .2s ease, border-color .2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white);
  background: rgba(41, 227, 107, .08);
  border-color: rgba(41, 227, 107, .35);
  outline: none;
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--amber);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-top: clamp(1.75rem, 4.5vw, 3rem);
  border-top: 1px solid var(--about-line);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(2rem, 6vw, 4rem);
}

.page-about .about-chapter__no {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 9vw, 4.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.05em;
  color: var(--about-ghost);
  margin-bottom: .35rem;
}

.page-about .about-chapter__head h2 {
  font-size: clamp(1.55rem, 3.6vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--white);
  margin: 0 0 .85rem;
}

.page-about .about-chapter__lede {
  font-size: clamp(.98rem, 1.5vw, 1.06rem);
  line-height: 1.8;
  color: var(--ink-dim);
  margin: 0;
  max-width: 44rem;
}

.page-about .about-chapter__body {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-chapter__body p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  max-width: 46rem;
  margin: 0 0 1rem;
}

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

.page-about .about-chapter__note {
  margin-top: 1.75rem !important;
  padding-left: 1.15rem;
  border-left: 3px solid var(--green);
  color: var(--ink) !important;
}

/* ---------- 三层索引 ---------- */
.page-about .index-layers {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 1.75rem 0;
  padding: 0;
}

.page-about .index-layers__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--green);
  margin-bottom: .5rem;
}

.page-about .index-layers h3 {
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 .4rem;
}

.page-about .index-layers p {
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-dim);
  margin: 0;
}

/* ---------- 校对链路 ---------- */
.page-about .audit-track {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-about .audit-track li {
  position: relative;
  padding-left: 1.75rem;
}

.page-about .audit-track li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .4rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: var(--about-glow);
}

.page-about .audit-track li:nth-child(2)::before {
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(23, 181, 138, .16);
}

.page-about .audit-track li:nth-child(3)::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 176, 32, .16);
}

.page-about .audit-track h3 {
  font-size: .98rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 .3rem;
}

.page-about .audit-track p {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ink-dim);
  margin: 0;
}

/* ---------- 字段胶囊 ---------- */
.page-about .field-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-about .field-chips li {
  font-family: var(--font-mono);
  font-size: .82rem;
  padding: .42rem .9rem;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: var(--about-panel);
  color: var(--ink);
}

/* ---------- 团队条形图 ---------- */
.page-about .about-team-media {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team-media .media-frame__cap {
  padding: .75rem clamp(.9rem, 2vw, 1.25rem) .9rem;
  margin: 0;
  font-size: .82rem;
  color: var(--ink-dim);
  background: var(--about-panel);
}

.page-about .role-chart {
  list-style: none;
  display: grid;
  gap: .25rem;
  margin: 0;
  padding: 0;
}

.page-about .role-chart__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 3rem;
  grid-template-areas:
    "name num"
    "bar bar"
    "hint hint";
  align-items: center;
  gap: .55rem .9rem;
  padding: 1rem 0;
  border-top: 1px solid var(--about-line);
  transition: background-color .2s ease;
}

.page-about .role-chart__row:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .role-chart__row:hover {
  background: rgba(41, 227, 107, .04);
}

.page-about .role-chart__name {
  grid-area: name;
  font-size: .95rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .role-chart__bar {
  grid-area: bar;
  height: 9px;
  border-radius: var(--pill);
  background: rgba(46, 74, 107, .55);
  overflow: hidden;
}

.page-about .role-chart__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--teal));
}

.page-about .role-chart__row:nth-child(1) .role-chart__fill { width: 39%; }
.page-about .role-chart__row:nth-child(2) .role-chart__fill { width: 22%; }
.page-about .role-chart__row:nth-child(3) .role-chart__fill { width: 22%; }
.page-about .role-chart__row:nth-child(4) .role-chart__fill { width: 18%; background: linear-gradient(90deg, var(--teal), var(--amber)); }

.page-about .role-chart__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--green);
  text-align: right;
}

.page-about .role-chart__hint {
  grid-area: hint;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--ink-dim);
  margin: 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .version-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline > li {
  position: relative;
  padding-left: 2.1rem;
  padding-bottom: 1.1rem;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .85rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 176, 32, .14);
  z-index: 1;
}

.page-about .about-timeline > li::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1.85rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(41, 227, 107, .55), var(--about-line));
}

.page-about .about-timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline > li:last-child::after {
  display: none;
}

.page-about .ver-node {
  border-radius: var(--r-sm);
}

.page-about .ver-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .45rem .75rem;
  padding: .8rem 1rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--about-line);
  background: var(--panel-2);
  cursor: pointer;
  list-style: none;
  transition: border-color .2s ease, background-color .2s ease;
}

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

.page-about .ver-node > summary:hover {
  border-color: rgba(41, 227, 107, .45);
}

.page-about .ver-node[open] > summary {
  border-color: rgba(41, 227, 107, .55);
  background: rgba(14, 42, 77, .92);
}

.page-about .ver-node__badge {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .06em;
  padding: .2rem .6rem;
  border-radius: var(--pill);
  background: rgba(255, 176, 32, .16);
  border: 1px solid rgba(255, 176, 32, .42);
  color: var(--amber);
}

.page-about .ver-node__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .95rem;
  font-weight: 700;
  color: var(--green);
}

.page-about .ver-node__title {
  font-size: .98rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .ver-node__body {
  padding: .85rem 1rem 1rem;
  border-left: 1px solid var(--about-line);
  border-right: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  margin-top: -1px;
}

.page-about .ver-node__body p {
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink-dim);
  margin: 0;
}

.page-about .version-grid__media {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .version-grid__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .version-grid__media .media-frame__cap {
  padding: .75rem 1rem .9rem;
  margin: 0;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--ink-dim);
  background: var(--about-panel);
}

/* ---------- 合作网络 ---------- */
.page-about .network {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .network__svg {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
}

.page-about .network__orbit {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .network__link {
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .network__core {
  fill: var(--panel);
  stroke: var(--green);
  stroke-width: 2;
}

.page-about .network__core-text {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  fill: var(--green);
}

.page-about .network__node circle {
  transition: filter .25s ease, transform .25s ease;
  transform-box: fill-box;
  transform-origin: center;
}

.page-about .network__node text {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  fill: var(--bg);
  pointer-events: none;
}

.page-about .network__node--a circle { fill: var(--green); }
.page-about .network__node--b circle { fill: var(--amber); }
.page-about .network__node--c circle { fill: var(--teal); }

.page-about .network__node:hover circle {
  transform: scale(1.08);
  filter: drop-shadow(0 0 12px rgba(41, 227, 107, .45));
}

.page-about .network__legend {
  list-style: none;
  display: grid;
  gap: 1.35rem;
  margin: 0;
  padding: 0;
}

.page-about .network__legend li {
  position: relative;
  padding-left: 1.35rem;
}

.page-about .network__legend li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
}

.page-about .network__legend li:nth-child(2)::before { background: var(--amber); }
.page-about .network__legend li:nth-child(3)::before { background: var(--teal); }

.page-about .network__legend h3 {
  font-size: .98rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 .3rem;
}

.page-about .network__legend p {
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink-dim);
  margin: 0;
}

.page-about .award-strip {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: 1rem 1.25rem;
  border-radius: var(--r-md);
  background: linear-gradient(100deg, rgba(255, 176, 32, .14), rgba(14, 42, 77, .35));
  border: 1px solid rgba(255, 176, 32, .32);
}

.page-about .award-strip__badge {
  flex: none;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .06em;
  padding: .3rem .7rem;
  border-radius: var(--pill);
  background: rgba(255, 176, 32, .2);
  border: 1px solid rgba(255, 176, 32, .5);
  color: var(--amber);
}

.page-about .award-strip__text {
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 !important;
}

/* ---------- 使用场景 ---------- */
.page-about .use-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
}

.page-about .use-list__item {
  padding: 1.5rem 0;
  border-top: 1px solid var(--about-line);
}

.page-about .use-list__item:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .use-list__item h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 .5rem;
}

.page-about .use-list__item p {
  font-size: .94rem;
  line-height: 1.8;
  color: var(--ink-dim);
  margin: 0 0 .85rem;
  max-width: 34rem;
}

.page-about .use-list__link {
  display: inline-block;
  font-size: .88rem;
  font-weight: 700;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 227, 107, .4);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .use-list__link:hover,
.page-about .use-list__link:focus-visible {
  color: var(--mint);
  border-color: var(--mint);
  outline: none;
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding: clamp(1.6rem, 4vw, 2.75rem);
  border-radius: var(--r-lg);
  border: 1px solid rgba(41, 227, 107, .3);
  background: linear-gradient(135deg, rgba(41, 227, 107, .15), rgba(23, 181, 138, .06) 46%, rgba(14, 42, 77, .72));
}

.page-about .about-cta__kicker {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 .75rem;
}

.page-about .about-cta h2 {
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 0 0 .85rem;
}

.page-about .about-cta p {
  font-size: .98rem;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 1.5rem;
  max-width: 40rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .index-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .index-layers > li {
    padding: 0 clamp(1rem, 2.2vw, 1.5rem);
    border-left: 1px solid var(--about-line);
  }

  .page-about .index-layers > li:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .index-layers > li:last-child {
    padding-right: 0;
  }

  .page-about .audit-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2rem);
  }

  .page-about .role-chart__row {
    grid-template-columns: 8.5rem minmax(0, 1fr) 3rem;
    grid-template-areas:
      "name bar num"
      "hint hint hint";
    gap: .6rem 1.1rem;
    padding: 1.15rem 0;
  }

  .page-about .role-chart__hint {
    padding-left: calc(8.5rem + 1.1rem);
  }
}

@media (min-width: 900px) {
  .page-about .about-run {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-index {
    position: sticky;
    top: 118px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: .1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border-radius: var(--r-xs);
    padding: .5rem .7rem;
  }

  .page-about .use-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(1.75rem, 4vw, 3.25rem);
  }

  .page-about .use-list__item:nth-child(1),
  .page-about .use-list__item:nth-child(2) {
    border-top-color: transparent;
  }
}

@media (min-width: 1000px) {
  .page-about .version-grid {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-about .version-grid__media {
    position: sticky;
    top: 118px;
  }

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

@media (max-width: 420px) {
  .page-about .about-hero__facts {
    gap: .65rem 1.4rem;
  }

  .page-about .award-strip {
    flex-direction: column;
    align-items: flex-start;
    gap: .65rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .role-chart__row,
  .page-about .ver-node > summary,
  .page-about .network__node circle,
  .page-about .use-list__link {
    transition: none;
  }
}