.page-about {
  position: relative;
  overflow-x: hidden;
  color: var(--paper);
  background: var(--ink-900);
}

/* ---------- 入场显现 ---------- */
.page-about [data-reveal] {
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.page-about [data-reveal][data-reveal-hidden] {
  opacity: 0;
  transform: translateY(16px);
}
.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 64px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(34, 224, 208, .12), transparent 58%),
    var(--ink-900);
  border-bottom: 1px solid var(--grid-line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -30%;
  width: 70%;
  height: 150%;
  background: linear-gradient(155deg, rgba(255, 107, 44, .28), rgba(255, 107, 44, 0) 62%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .breadcrumb {
  margin-bottom: 26px;
}
.page-about .breadcrumb-list a {
  color: var(--mist);
  text-decoration: none;
  transition: color .25s var(--ease);
}
.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--cyan);
}
.page-about .breadcrumb-item[aria-current] {
  color: var(--gold);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 34px;
}
.page-about .about-hero .eyebrow {
  margin-bottom: 14px;
}
.page-about .about-hero .display-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-hero .display-title em {
  font-style: normal;
  color: var(--orange);
}
.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 索引卡 */
.page-about .hero-index {
  border: 1px solid var(--grid-strong);
  background: rgba(11, 34, 56, .72);
  padding: 18px 18px 8px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.page-about .hero-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
}
.page-about .hero-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .hero-index-list li + li {
  border-top: 1px solid var(--grid-line);
}
.page-about .hero-index-list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 2px;
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  transition: color .25s var(--ease), padding-left .25s var(--ease);
}
.page-about .hero-index-list a:hover,
.page-about .hero-index-list a:focus-visible {
  color: var(--orange);
  padding-left: 7px;
}
.page-about .idx-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

/* 数据条 */
.page-about .hero-stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--grid-strong);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .stat-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--paper);
}
.page-about .hero-stats li:nth-child(2) .stat-num { color: var(--cyan); }
.page-about .hero-stats li:nth-child(3) .stat-num { color: var(--orange); }
.page-about .hero-stats li:nth-child(4) .stat-num { color: var(--gold); }
.page-about .stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 通用区块 ---------- */
.page-about .about-coord,
.page-about .about-principles,
.page-about .about-system,
.page-about .about-network,
.page-about .about-milestones,
.page-about .about-reasons,
.page-about .about-cta {
  position: relative;
  padding: clamp(52px, 8vw, 100px) 0;
}
.page-about .about-principles,
.page-about .about-reasons {
  background: var(--ink-800);
}
.page-about .about-network {
  background-color: var(--ink-800);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
}
.page-about .section-head {
  max-width: 780px;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.page-about .section-head h2,
.page-about .block-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
}
.page-about .section-sub {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 品牌坐标 ---------- */
.page-about .coord-body {
  display: grid;
  gap: 32px;
}
.page-about .year-axis {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 26px;
  position: relative;
  display: grid;
  gap: 26px;
}
.page-about .year-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(60, 105, 134, .34) 100%);
}
.page-about .year-axis-item {
  position: relative;
}
.page-about .year-axis-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--ink-900);
  box-shadow: 0 0 0 4px rgba(245, 194, 107, .1);
}
.page-about .axis-year {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  line-height: 1;
  color: var(--gold);
}
.page-about .axis-note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .coord-main {
  display: grid;
  gap: 26px;
}
.page-about .coord-figure {
  position: relative;
  border: 1px solid var(--grid-strong);
  background: var(--ink-800);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .coord-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .94;
}
.page-about .coord-prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .coord-prose p:last-child {
  margin-bottom: 0;
}
.page-about .coord-prose strong {
  color: var(--paper);
  font-weight: 500;
}

/* ---------- 运营准则 ---------- */
.page-about .principles {
  display: grid;
  gap: 16px;
}
.page-about .principle {
  position: relative;
  padding: 26px 22px 28px;
  background: rgba(18, 53, 80, .58);
  border: 1px solid var(--grid-line);
  border-top: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform .3s var(--ease), background .3s var(--ease);
}
.page-about .principle:hover {
  transform: translateY(-3px);
  background: rgba(18, 53, 80, .82);
}
.page-about .principle:nth-child(2) { border-top-color: var(--orange); }
.page-about .principle:nth-child(3) { border-top-color: var(--gold); }
.page-about .principle-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .principle:nth-child(2) .principle-code { color: var(--orange); }
.page-about .principle:nth-child(3) .principle-code { color: var(--gold); }
.page-about .principle h3 {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}
.page-about .principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 内容体系与审核协作 ---------- */
.page-about .system-grid {
  display: grid;
  gap: 30px;
}
.page-about .system-figure {
  position: relative;
  border: 1px solid var(--grid-strong);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .system-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .9;
}
.page-about .block-copy {
  margin: 16px 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-team-accordion {
  border-top: 1px solid var(--grid-line);
}
.page-about .about-team-accordion .accordion-item {
  border-bottom: 1px solid var(--grid-line);
}
.page-about .about-team-accordion .accordion-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 15px 2px;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}
.page-about .about-team-accordion .accordion-trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .accordion-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}
.page-about .accordion-sign {
  position: relative;
  margin-left: auto;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}
.page-about .accordion-sign::before,
.page-about .accordion-sign::after {
  content: "";
  position: absolute;
  background: var(--orange);
  transition: transform .25s var(--ease);
}
.page-about .accordion-sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}
.page-about .accordion-sign::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}
.page-about .accordion-trigger[aria-expanded="true"] .accordion-sign::after {
  transform: scaleY(0);
}
.page-about .accordion-panel {
  padding: 0 2px 18px 26px;
}
.page-about .accordion-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 协作网络 ---------- */
.page-about .network-layout {
  display: grid;
  gap: 28px;
}
.page-about .network-figure {
  position: relative;
  border: 1px solid var(--grid-strong);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .network-figure img {
  display: block;
  width: 100%;
  min-height: 220px;
  height: 100%;
  object-fit: cover;
  opacity: .85;
}
.page-about .network-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .network-node {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  background: rgba(6, 24, 38, .66);
  border: 1px solid var(--grid-line);
  border-left: 2px solid var(--cyan);
  transition: border-left-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}
.page-about .network-node:hover,
.page-about .network-node:focus-within {
  border-left-color: var(--orange);
  background: rgba(6, 24, 38, .94);
  transform: translateX(4px);
}
.page-about .node-num {
  min-width: 48px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}
.page-about .network-node:nth-child(2) .node-num { color: var(--orange); }
.page-about .network-node:nth-child(3) .node-num { color: var(--gold); }
.page-about .network-node:nth-child(4) .node-num { color: var(--paper); }
.page-about .node-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .network-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 版本里程碑 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--gold) 55%, var(--cyan) 100%);
  opacity: .55;
}
.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 30px;
}
.page-about .tl-item:last-child {
  padding-bottom: 0;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, .12);
}
.page-about .tl-year {
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.1;
  color: var(--orange);
}
.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .tl-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 四个理由 ---------- */
.page-about .reason-grid {
  display: grid;
  gap: 16px;
}
.page-about .reason-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px 30px;
  background: var(--ink-900);
  border: 1px solid var(--grid-line);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}
.page-about .reason-card:hover {
  transform: translateY(-3px);
  border-color: var(--grid-strong);
}
.page-about .reason-card::after {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 107, 44, 0));
  transform: scaleX(.24);
  transform-origin: left;
  transition: transform .4s var(--ease);
}
.page-about .reason-card:hover::after {
  transform: scaleX(1);
}
.page-about .reason-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .reason-card h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .reason-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  overflow: hidden;
  background: var(--ink-900);
  border-top: 1px solid var(--grid-strong);
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: -10%;
  top: 0;
  width: 62%;
  height: 100%;
  background: linear-gradient(120deg, rgba(255, 107, 44, .2), rgba(255, 107, 44, 0) 70%);
  clip-path: polygon(0 0, 100% 0, 76% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-cta-inner {
  position: relative;
  display: grid;
  gap: 24px;
}
.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--paper);
}
.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero .lede {
    font-size: 17px;
  }
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }
  .page-about .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .reason-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .reason-a {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .82fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .system-grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .network-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 44px;
    align-items: stretch;
  }
  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
    gap: 44px;
  }
  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 960px) {
  .page-about .coord-body {
    grid-template-columns: 228px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
  .page-about .coord-main {
    gap: 30px;
  }
  .page-about .about-timeline::before {
    left: 96px;
  }
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 86px minmax(0, 1fr);
    gap: 34px;
    padding: 0 0 34px 0;
  }
  .page-about .tl-item::before {
    left: 92px;
  }
  .page-about .tl-year {
    margin-bottom: 0;
    padding-top: 2px;
    text-align: right;
  }
}

@media (min-width: 1080px) {
  .page-about .reason-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .reason-a { grid-column: span 4; }
  .page-about .reason-b { grid-column: span 2; }
  .page-about .reason-c { grid-column: span 3; }
  .page-about .reason-d { grid-column: span 3; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal][data-reveal-hidden],
  .page-about [data-reveal][data-revealed] {
    transition: none;
    transform: none;
    opacity: 1;
  }
  .page-about .principle,
  .page-about .reason-card,
  .page-about .network-node,
  .page-about .hero-index-list a,
  .page-about .reason-card::after,
  .page-about .accordion-sign::before,
  .page-about .accordion-sign::after {
    transition: none;
  }
  .page-about .principle:hover,
  .page-about .reason-card:hover,
  .page-about .network-node:hover {
    transform: none;
  }
}