.page-about {
  --about-paper: #1A1428;
  --about-paper-mid: #1F1830;
  --about-gold-glow: rgba(245, 184, 65, 0.6);
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: calc(var(--header-h) + 32px) var(--gutter) 100px;
  color: var(--text-light);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-crumbs {
  margin-bottom: 28px;
}
.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  color: var(--grid-line);
}
.page-about .about-crumbs li + li::before {
  content: "◆";
  margin-right: 8px;
  color: var(--accent-pink);
  font-size: 10px;
}
.page-about .about-crumbs a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--trans);
}
.page-about .about-crumbs a:hover {
  color: var(--accent-amber);
}
.page-about .about-crumbs [aria-current="page"] {
  color: var(--text-light);
}

/* Hero 首屏档案摘要 */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding: 32px 0 48px;
  margin-bottom: 48px;
  border-bottom: 2px solid var(--grid-line);
}
.page-about .about-eyebrow {
  display: inline-block;
  padding: 4px 14px;
  border: 1px solid var(--accent-primary);
  border-radius: 99px;
  color: var(--accent-primary);
  font-size: 12px;
  letter-spacing: 2px;
  margin: 0 0 16px;
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 20px;
  letter-spacing: 1px;
}
.page-about .about-hero-desc {
  font-size: 16px;
  color: rgba(255, 243, 224, 0.82);
  max-width: 58ch;
  margin: 0;
}
.page-about .about-hero-side {
  position: relative;
  background: var(--bg-indigo);
  border: 1px solid var(--grid-line);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 8px 8px 0 0 var(--bg-panel), 0 12px 32px rgba(0, 0, 0, 0.2);
}
.page-about .about-arch-note {
  display: flex;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--grid-line);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--accent-pink);
}
.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0 0;
}
.page-about .about-hero-stat dt {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--grid-line);
}
.page-about .about-hero-stat dd {
  margin: 2px 0 0;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent-amber);
}

/* 布局：左侧章节索引 + 右侧内容 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
}
.page-about .about-index-label {
  width: 100%;
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--accent-pink);
}
.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 12px;
  font-size: 14px;
  color: var(--text-light);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: border-color var(--trans), background var(--trans), color var(--trans);
}
.page-about .about-index a .mono {
  font-size: 12px;
  color: var(--accent-primary);
}
.page-about .about-index a:hover {
  border-color: var(--accent-primary);
  background: rgba(164, 117, 255, 0.08);
  color: var(--accent-amber);
}

/* 通用 section */
.page-about .about-section {
  margin-bottom: 64px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .about-sect-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}
.page-about .about-sect-index {
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--accent-pink);
  white-space: nowrap;
}
.page-about .about-sect-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  margin: 0;
  line-height: 1.25;
}
.page-about .about-sect-line {
  flex: 1;
  height: 1px;
  background: var(--grid-line);
  align-self: center;
}
.page-about .about-lede {
  margin: 0 0 20px;
  font-size: 15px;
  color: rgba(255, 243, 224, 0.75);
}
.page-about .about-lede a,
.page-about .about-origin-text a,
.page-about .about-team-duty a,
.page-about .about-copy-text a {
  color: var(--accent-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-lede a:hover,
.page-about .about-origin-text a:hover,
.page-about .about-team-duty a:hover,
.page-about .about-copy-text a:hover {
  color: var(--accent-amber);
}

/* 站点由来 */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .about-origin-text p {
  margin: 0 0 14px;
}
.page-about .about-figure {
  position: relative;
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--grid-line);
}
.page-about .about-figure--origin {
  max-width: 420px;
}
.page-about .about-figure--origin::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-paper-mid);
  border-radius: 6px;
  border: 1px solid var(--grid-line);
  transform: translate(10px, 10px);
  z-index: -1;
}

/* 关键里程 */
.page-about .about-sect-milestones {
  background: linear-gradient(160deg, rgba(164, 117, 255, 0.1), transparent 45%), var(--bg-indigo);
  border: 1px solid var(--grid-line);
  border-radius: 12px;
  padding: 32px 20px 40px;
}
.page-about .about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-left: 28px;
  margin-top: 32px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 8px;
  border-left: 2px solid var(--grid-line);
}
.page-about .about-tl-node {
  position: relative;
  display: block;
  text-decoration: none;
  color: var(--text-light);
}
.page-about .about-tl-dot {
  position: absolute;
  top: 6px;
  left: -24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid var(--about-paper-mid);
  transition: background var(--trans), box-shadow var(--trans), transform var(--trans);
}
.page-about .about-tl-year {
  display: block;
  font-size: 20px;
  color: var(--accent-pink);
  letter-spacing: 1px;
}
.page-about .about-tl-event {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-top: 2px;
}
.page-about .about-tl-note {
  display: block;
  font-size: 13px;
  color: rgba(255, 243, 224, 0.72);
  margin-top: 4px;
}
.page-about .about-tl-node:hover .about-tl-dot,
.page-about .about-tl-node:focus-visible .about-tl-dot {
  background: var(--accent-amber);
  box-shadow: 0 0 14px var(--about-gold-glow);
  transform: scale(1.2);
}
.page-about .about-tl-node:hover .about-tl-year,
.page-about .about-tl-node:focus-visible .about-tl-year {
  color: var(--accent-amber);
}

/* 内容治理 */
.page-about .about-gov-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .about-gov-item {
  padding: 22px;
}
.page-about .about-gov-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--text-light);
}
.page-about .about-gov-item p {
  font-size: 14.5px;
  margin: 0;
  color: rgba(255, 243, 224, 0.85);
}
.page-about .about-gov-steps {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 8px;
}
.page-about .about-gov-steps li {
  font-size: 14px;
  color: rgba(255, 243, 224, 0.85);
  border-bottom: 1px dashed var(--grid-line);
  padding-bottom: 8px;
}
.page-about .about-gov-steps .mono {
  color: var(--accent-primary);
  font-size: 12px;
  margin-right: 8px;
}
.page-about .about-gov-note {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 20px;
  padding: 14px 18px;
  background: var(--bg-panel);
  border-left: 3px solid var(--accent-amber);
  border-radius: 4px;
}
.page-about .about-gov-note .mono {
  color: var(--accent-amber);
  font-size: 12px;
  white-space: nowrap;
}
.page-about .about-gov-note p {
  margin: 0;
  font-size: 14px;
}

/* 团队分工 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}
.page-about .about-team-card {
  background: var(--bg-panel);
  border: 1px solid var(--grid-line);
  border-left: 3px solid var(--accent-primary);
  border-radius: 6px;
  padding: 18px 20px;
  transition: background var(--trans), border-color var(--trans), transform var(--trans), box-shadow var(--trans);
}
.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  background: var(--bg-indigo);
  border-left-color: var(--accent-amber);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.page-about .about-team-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}
.page-about .about-team-role {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
}
.page-about .about-team-id {
  font-size: 12px;
  color: var(--accent-pink);
}
.page-about .about-team-duty {
  font-size: 14.5px;
  margin: 0;
  color: rgba(255, 243, 224, 0.85);
}
.page-about .about-figure--team {
  max-width: 560px;
  margin: 12px auto 0;
}
.page-about .about-figure--team img {
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

/* 版权声明 */
.page-about .about-sect-copyright {
  background: var(--bg-wine);
  border: 1px solid rgba(245, 184, 65, 0.2);
  border-radius: 12px;
  padding: 28px 24px;
}
.page-about .about-copy-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}
.page-about .about-copy-text p {
  font-size: 15px;
  color: rgba(255, 243, 224, 0.9);
  margin: 0 0 12px;
}
.page-about .about-copy-text a {
  color: var(--accent-amber);
}
.page-about .about-copy-text .btn {
  margin-top: 8px;
}
.page-about .about-figure--copyright {
  max-width: 280px;
  margin: 0 auto;
}
.page-about .about-figure--copyright img {
  border-radius: 50%;
  border: 2px solid rgba(245, 184, 65, 0.3);
  max-width: 260px;
}

/* 平板与桌面 */
@media (min-width: 768px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.65fr);
    gap: 56px;
    padding-bottom: 56px;
  }
  .page-about .about-hero-side {
    align-self: start;
  }
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    display: flex;
    flex-direction: column;
    border-top: none;
    border-bottom: none;
    border-left: 2px solid var(--grid-line);
    padding: 4px 0 4px 12px;
    gap: 2px;
  }
  .page-about .about-index-label {
    margin-bottom: 10px;
  }
  .page-about .about-index a {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-left: -12px;
    padding: 8px 12px;
    border-left: 2px solid transparent;
    border-radius: 0;
    border-top: none;
    border-right: none;
    border-bottom: none;
  }
  .page-about .about-index a:hover {
    border-left-color: var(--accent-primary);
  }
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 40px;
    align-items: start;
  }
  .page-about .about-figure--origin {
    margin-top: 8px;
  }
  .page-about .about-timeline {
    flex-direction: row;
    justify-content: space-between;
    gap: 14px;
    padding-left: 0;
    padding-top: 20px;
    margin-top: 44px;
  }
  .page-about .about-timeline::before {
    top: 20px;
    bottom: auto;
    left: 2%;
    right: 2%;
    border-left: none;
    border-top: 2px solid var(--grid-line);
  }
  .page-about .about-tl-node {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .page-about .about-tl-dot {
    position: static;
    margin: 12px auto;
  }
  .page-about .about-tl-year {
    font-size: 26px;
  }
  .page-about .about-gov-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .page-about .about-copy-wrap {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
  }
  .page-about .about-team-card {
    height: 100%;
  }
}