.page-about {
  --about-line: rgba(201, 162, 39, 0.22);
  --about-line-cool: rgba(79, 209, 197, 0.24);
  --about-radius: 2px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 68px) 0 clamp(46px, 8vw, 104px);
  background:
    radial-gradient(115% 88% at 84% 6%, rgba(226, 58, 120, 0.15) 0%, rgba(226, 58, 120, 0) 54%),
    radial-gradient(92% 72% at 2% 100%, rgba(79, 209, 197, 0.13) 0%, rgba(79, 209, 197, 0) 62%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
  margin-top: clamp(22px, 4vw, 46px);
}

.page-about .about-hero-copy .display-title {
  margin: clamp(14px, 2vw, 22px) 0 0;
}

.page-about .about-hero-copy .lede {
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero-marks {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-hair);
  border-top: 1px solid var(--line-hair);
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-hero-marks li {
  background: var(--ink-base);
  padding: 14px 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-mark-value {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  color: var(--gold);
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.page-about .about-mark-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--graphite);
}

.page-about .about-hero-figure {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line-soft);
  background: var(--ink-layer);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-hero-figure .figure-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--graphite);
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--ivory);
  margin: 0 0 14px;
  max-width: 26em;
}

.page-about .about-strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold-bright);
  letter-spacing: 0.02em;
}

/* ---------- 01 定位 ---------- */
.page-about .about-scope-grid {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-scope-list li {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-scope-list li::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 10px;
  width: 1px;
  height: 22px;
  background: var(--gold);
}

.page-about .about-scope-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-scope-title {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--ivory);
  margin: 0 0 8px;
}

.page-about .about-scope-list p {
  margin: 0;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.8;
  max-width: var(--measure);
}

.page-about .about-scope-aside {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-content: start;
}

.page-about .about-scope-panel {
  padding: clamp(20px, 2.8vw, 30px);
  border: 1px solid var(--line-hair);
  border-radius: var(--about-radius);
}

.page-about .about-scope-panel-title {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-scope-panel p {
  margin: 0;
  color: var(--ivory);
  font-size: 15px;
  line-height: 1.85;
  max-width: var(--measure);
}

.page-about .stat-row {
  border-top: 1px solid var(--line-hair);
}

.page-about .stat-value {
  color: var(--gold);
}

/* ---------- 动作窄条 ---------- */
.page-about .action-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-top: clamp(30px, 4vw, 50px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .action-strip-link {
  flex: 1 1 220px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ivory);
  text-decoration: none;
  transition: background 220ms var(--ease), color 220ms var(--ease);
}

.page-about .action-strip-link + .action-strip-link {
  border-left: 1px solid var(--line-hair);
}

.page-about .action-strip-link .index-num {
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .action-strip-link:hover,
.page-about .action-strip-link:focus-visible {
  background: rgba(226, 58, 120, 0.12);
  color: var(--gold-bright);
  outline: none;
}

.page-about .action-strip-link:focus-visible {
  box-shadow: inset 0 0 0 2px var(--gold-bright);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(28px, 4vw, 50px) 0 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 30px;
  padding: clamp(18px, 2.6vw, 30px) 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 54px;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-node:last-child::before {
  background: linear-gradient(180deg, var(--about-line) 0%, rgba(201, 162, 39, 0.1) 70%, rgba(201, 162, 39, 0) 100%);
}

.page-about .about-node-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-align: right;
  padding-top: 20px;
  line-height: 1.4;
}

.page-about .about-node-panel {
  min-width: 0;
  border: 1px solid var(--line-hair);
  border-radius: var(--about-radius);
  background: var(--ink-layer);
  transition: border-color 220ms var(--ease), background 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .about-node-panel:hover {
  border-color: var(--about-line);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

.page-about .about-node-panel[open] {
  border-color: var(--about-line);
  background: linear-gradient(180deg, var(--ink-layer) 0%, rgba(18, 59, 51, 0.55) 100%);
}

.page-about .about-node-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding: clamp(15px, 2.2vw, 22px) clamp(15px, 2.4vw, 26px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node-summary:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: -2px;
}

.page-about .about-node-flag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid var(--about-line);
  border-radius: var(--about-radius);
  padding: 3px 7px;
  white-space: nowrap;
}

.page-about .about-node-title {
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ivory);
}

.page-about .about-node-cue {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--graphite);
  white-space: nowrap;
}

.page-about .about-node-cue::after {
  content: "展开";
}

.page-about .about-node-panel[open] .about-node-cue::after {
  content: "收起";
}

.page-about .about-node-panel[open] .about-node-cue {
  color: var(--neon);
}

.page-about .about-node-body {
  padding: 0 clamp(15px, 2.4vw, 26px) clamp(18px, 2.4vw, 26px);
  animation: aboutNodeIn 180ms var(--ease) both;
}

@keyframes aboutNodeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-node-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ivory);
  max-width: var(--measure);
}

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

.page-about .about-node-problem {
  padding-left: 12px;
  border-left: 2px solid rgba(226, 58, 120, 0.55);
  color: var(--graphite) !important;
}

.page-about .about-node--current .about-node-index {
  color: var(--gold-bright);
}

.page-about .about-node--current .about-node-panel {
  border-color: var(--about-line);
}

.page-about .about-node--current .about-node-flag {
  color: var(--ink-deepest);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-node--current::before {
  width: 2px;
  left: 53px;
  background: linear-gradient(180deg, rgba(201, 162, 39, 0.2) 0%, var(--gold) 45%, rgba(201, 162, 39, 0) 100%);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-team-figure {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line-hair);
  background: var(--ink-layer);
}

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

.page-about .about-team-figure .figure-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite);
}

.page-about .about-team-copy > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ivory);
  max-width: var(--measure);
  margin: 0 0 18px;
}

.page-about .about-team-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--line-hair);
}

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-team-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .about-team-title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--ivory);
  margin: 0 0 6px;
}

.page-about .about-team-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  max-width: var(--measure);
}

.page-about .about-local {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--about-line-cool);
  border-radius: var(--about-radius);
}

.page-about .about-local-title {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-local p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ivory);
  max-width: var(--measure);
}

.page-about .about-local .mono {
  color: var(--gold-bright);
}

/* ---------- 04 测试版栏目 ---------- */
.page-about .about-beta-grid {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-beta-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.8vw, 30px);
  border-radius: var(--about-radius);
  border: 1px solid var(--line-hair);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .about-beta-card:hover,
.page-about .about-beta-card:focus-visible {
  border-color: var(--about-line);
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.3);
  outline: none;
}

.page-about .about-beta-card:focus-visible {
  box-shadow: 0 0 0 2px var(--gold-bright), 0 16px 34px rgba(0, 0, 0, 0.3);
}

.page-about .about-beta-index {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .about-beta-card .card-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--ivory);
}

.page-about .about-beta-card .card-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-eco-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-eco-figure {
  margin: 0;
  border: 1px solid var(--line-hair);
  background: linear-gradient(160deg, rgba(18, 59, 51, 0.7) 0%, rgba(11, 43, 38, 0.9) 100%);
  padding: 14px;
  overflow-x: auto;
}

.page-about .about-eco-svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .eco-node rect,
.page-about .eco-leaf rect {
  fill: rgba(11, 43, 38, 0.9);
  stroke: var(--about-line);
  stroke-width: 1;
  transition: fill 200ms var(--ease), stroke 200ms var(--ease);
}

.page-about .eco-node,
.page-about .eco-leaf {
  outline: none;
}

.page-about .eco-node:focus-visible rect,
.page-about .eco-node:hover rect {
  stroke: var(--gold-bright);
  fill: rgba(18, 59, 51, 0.95);
}

.page-about .eco-leaf--content rect {
  stroke: rgba(79, 209, 197, 0.3);
}

.page-about .eco-leaf--tech rect {
  stroke: rgba(226, 58, 120, 0.3);
}

.page-about .eco-label {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  fill: var(--ivory);
  text-anchor: middle;
}

.page-about .eco-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  fill: var(--graphite);
  text-anchor: middle;
}

.page-about .eco-leaf-label {
  font-family: var(--font-body);
  font-size: 13px;
  fill: var(--ivory);
  text-anchor: middle;
}

.page-about .eco-link {
  fill: none;
  stroke: var(--about-line);
  stroke-width: 1;
  transition: stroke 200ms var(--ease);
}

.page-about .about-eco-svg:hover .eco-link--content,
.page-about .about-eco-svg:hover .eco-link--tech {
  stroke: rgba(201, 162, 39, 0.4);
}

.page-about .eco-node--content:hover ~ .eco-link--content,
.page-about .eco-node--content:focus-visible ~ .eco-link--content {
  stroke: var(--cyan);
}

.page-about .about-eco-svg .eco-node--tech:hover ~ .eco-link--tech,
.page-about .about-eco-svg .eco-node--tech:focus-visible ~ .eco-link--tech {
  stroke: var(--neon);
}

.page-about .about-eco-hint {
  margin: 12px 0 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--graphite);
}

.page-about .about-eco-copy {
  display: grid;
  gap: 2px;
}

.page-about .about-eco-block {
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--line-hair);
}

.page-about .about-eco-block:last-child {
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-eco-tag {
  font-size: 11px;
  letter-spacing: 0.16em;
  margin: 0 0 10px;
}

.page-about .about-eco-block--content .about-eco-tag {
  color: var(--cyan);
}

.page-about .about-eco-block--tech .about-eco-tag {
  color: var(--neon);
}

.page-about .about-eco-block p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ivory);
  max-width: var(--measure);
}

/* ---------- 06 承诺 ---------- */
.page-about .about-pledge-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.page-about .about-pledge-figure {
  margin: 0;
  position: relative;
}

.page-about .about-pledge-figure img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
}

.page-about .about-pledge-copy > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ivory);
  max-width: var(--measure);
  margin: 0 0 16px;
}

.page-about .about-pledge-strip {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-beta-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team-list li {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .about-hero-figure {
    margin-top: clamp(24px, 5vw, 76px);
    margin-left: calc(-1 * clamp(0px, 3vw, 44px));
  }

  .page-about .about-scope-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-node {
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: 44px;
  }

  .page-about .about-node::before {
    left: 84px;
  }

  .page-about .about-node--current::before {
    left: 83px;
  }

  .page-about .about-node-index {
    font-size: 14px;
    padding-top: 22px;
  }

  .page-about .about-node:nth-child(odd) .about-node-panel {
    margin-right: clamp(20px, 9vw, 170px);
  }

  .page-about .about-node:nth-child(even) .about-node-panel {
    margin-left: clamp(20px, 7vw, 128px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

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

  .page-about .about-eco-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }

  .page-about .about-pledge-grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  }

  .page-about .about-pledge-copy {
    padding-left: clamp(0px, 2vw, 28px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-grid {
    gap: clamp(40px, 5vw, 76px);
  }

  .page-about .about-node:nth-child(odd) .about-node-panel {
    margin-right: clamp(60px, 12vw, 230px);
  }

  .page-about .about-node:nth-child(even) .about-node-panel {
    margin-left: clamp(40px, 9vw, 160px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node-body {
    animation: none;
  }

  .page-about .about-beta-card,
  .page-about .about-node-panel,
  .page-about .action-strip-link {
    transition: none;
  }
}