/* =========================================================
   品牌与团队 · 页面专属样式（作用域：.page-about）
   ========================================================= */

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 26px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb-list li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb-list li + li::before {
  content: "";
  display: block;
  width: 14px;
  height: 1px;
  background: var(--line);
  margin: 0 8px;
}

.page-about .breadcrumb-list a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease-out, border-color .2s ease-out;
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.page-about .breadcrumb-list [aria-current="page"] {
  color: var(--text);
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  padding: 56px 0;
}

.page-about .section-head {
  margin-bottom: 32px;
}

.page-about .section-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--accent);
  margin-bottom: 14px;
}

.page-about .section-title {
  margin: 0 0 14px;
  font-size: clamp(23px, 4.4vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.01em;
  max-width: 24em;
}

.page-about .section-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 720px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 60px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -32%;
  width: 92%;
  height: 132%;
  background: linear-gradient(140deg, var(--ink-800) 0%, var(--ink-700) 58%, rgba(11, 42, 50, 0) 100%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 72%);
  opacity: .9;
  pointer-events: none;
  display: none;
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 34px;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--accent);
}

.page-about .about-kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--hi);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, .12);
  animation: about-pulse 2s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .34; }
}

.page-about h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 7.2vw, 56px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  max-width: 14em;
}

.page-about .about-lede {
  margin: 0 0 28px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  max-width: 660px;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-figures {
  display: grid;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(11, 42, 50, .5);
}

.page-about .about-figures .stat {
  padding: 18px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-figures .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--hi);
  font-variant-numeric: tabular-nums;
  margin-bottom: 9px;
}

.page-about .about-figures .stat-label {
  display: block;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .role-board {
  display: grid;
  gap: 16px;
}

.page-about .role-card {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  transition: background .25s ease-out, border-color .25s ease-out, transform .25s ease-out;
}

.page-about .role-card:hover {
  background: var(--ink-700);
  border-left-color: var(--hi);
  transform: translateY(-2px);
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .role-name {
  margin: 0;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 23px;
  font-weight: 700;
  color: var(--hi);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .role-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow-figure {
  margin: 0 0 30px;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-flow-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .flow-track {
  display: grid;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.page-about .flow-step {
  padding: 26px 22px 28px;
  border-top: 1px solid var(--line);
}

.page-about .flow-step:first-child {
  border-top: 0;
}

.page-about .flow-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--accent);
  margin-bottom: 12px;
}

.page-about .flow-step h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .flow-arrow {
  display: none;
}

.page-about .flow-pulse {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 22px;
  padding: 16px 20px;
  border-left: 3px solid var(--hi);
  background: rgba(11, 42, 50, .7);
}

.page-about .flow-pulse p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 内容生产 ---------- */
.page-about .about-editorial-grid {
  display: grid;
  gap: 34px;
}

.page-about .column-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .column-list li {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .column-list h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 900;
  color: var(--text);
}

.page-about .column-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .editorial-note {
  margin: 24px 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 640px;
}

.page-about .about-editorial-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-editorial-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 42px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .strip-cell {
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 20px 18px;
  background: var(--ink-800);
}

.page-about .strip-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--hi);
  font-variant-numeric: tabular-nums;
}

.page-about .strip-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .version-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .version-item {
  position: relative;
}

.page-about .version-marker {
  display: none;
}

.page-about .version-panel {
  padding: 22px 22px 24px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  transition: background .25s ease-out, border-color .25s ease-out;
}

.page-about .version-panel:hover {
  background: var(--ink-700);
  border-color: var(--rule);
}

.page-about .version-panel .panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 12px;
}

.page-about .version-code {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.2;
  color: var(--rule-soft);
  border: 1px solid var(--rule);
  padding: 3px 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .version-panel .panel-title {
  margin: 0;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .version-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-version-figure {
  margin: 32px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-version-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
}

.page-about .partner-card {
  padding: 26px 22px 28px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  transition: border-top-color .25s ease-out, transform .25s ease-out;
}

.page-about .partner-card:hover {
  border-top-color: var(--hi);
  transform: translateY(-3px);
}

.page-about .partner-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--hi);
  font-variant-numeric: tabular-nums;
  margin-bottom: 14px;
}

.page-about .partner-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 900;
}

.page-about .partner-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 三条准则 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .principle-item {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.page-about .principle-item:first-child {
  border-top-color: var(--accent);
}

.page-about .principle-mark {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--accent);
  margin-bottom: 12px;
}

.page-about .principle-item h3 {
  margin: 0 0 10px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .principle-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作入口 ---------- */
.page-about .about-cta {
  padding-bottom: 92px;
}

.page-about .cta-board {
  position: relative;
  display: grid;
  gap: 28px;
  padding: 38px 26px 40px;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, var(--ink-800) 0%, var(--ink-700) 100%);
  overflow: hidden;
}

.page-about .cta-board::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(18, 224, 196, .22), rgba(18, 224, 196, 0) 68%);
  pointer-events: none;
}

.page-about .cta-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--hi);
}

.page-about .cta-board h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 4.2vw, 32px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -.01em;
  max-width: 20em;
}

.page-about .cta-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 620px;
}

.page-about .cta-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* =========================================================
   断点：≥ 620px
   ========================================================= */
@media (min-width: 620px) {
  .page-about .column-list li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

/* =========================================================
   断点：≥ 760px
   ========================================================= */
@media (min-width: 760px) {
  .page-about .section {
    padding: 72px 0;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .role-board {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .role-card--a { grid-column: 1 / span 7; }
  .page-about .role-card--b { grid-column: 8 / span 5; }
  .page-about .role-card--c { grid-column: 1 / span 5; }
  .page-about .role-card--d { grid-column: 6 / span 7; }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .principle-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .principle-item {
    padding: 26px 0 0;
  }

  .page-about .about-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cta-board {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
    gap: 40px;
    padding: 52px 46px 54px;
  }
}

/* =========================================================
   断点：≥ 860px
   ========================================================= */
@media (min-width: 860px) {
  .page-about .about-hero::before {
    display: block;
  }

  .page-about .flow-track {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .flow-step {
    border-top: 0;
  }

  .page-about .flow-step:not(:first-child) {
    border-left: 1px solid var(--line);
  }

  .page-about .flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    padding: 0 6px;
  }
}

/* =========================================================
   断点：≥ 900px
   ========================================================= */
@media (min-width: 900px) {
  .page-about .section {
    padding: 88px 0;
  }

  .page-about .about-hero {
    padding: 44px 0 78px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .55fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-editorial-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-cta {
    padding-bottom: 132px;
  }

  /* 版本时间线：竖线 + 节点，面板逐层错位堆叠 */
  .page-about .version-track {
    position: relative;
    padding-left: 40px;
    gap: 12px;
  }

  .page-about .version-track::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 22px;
    bottom: 22px;
    width: 1px;
    background: linear-gradient(180deg, var(--accent) 0%, var(--rule) 62%, rgba(108, 76, 255, 0) 100%);
  }

  .page-about .version-marker {
    display: block;
    position: absolute;
    left: -33px;
    top: 22px;
    width: 15px;
    height: 15px;
    background: var(--ink-900);
    border: 1px solid var(--accent);
  }

  .page-about .version-dot {
    display: block;
    width: 5px;
    height: 5px;
    margin: 4px;
    background: var(--hi);
  }

  .page-about .version-item:nth-child(2) .version-panel { margin-left: 5%; }
  .page-about .version-item:nth-child(3) .version-panel { margin-left: 10%; }
  .page-about .version-item:nth-child(4) .version-panel { margin-left: 15%; }
}

/* =========================================================
   动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-kicker::before {
    animation: none;
  }

  .page-about .role-card,
  .page-about .partner-card,
  .page-about .version-panel,
  .page-about .breadcrumb-list a {
    transition: none;
  }
}
<<<END>>>