.page-about {
  --tb-line: 15px;
  --tb-pad: 42px;
  --about-gap: 20px;
}

.page-about .about-hero {
  padding-top: 26px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 22px;
  margin-top: 16px;
}

.page-about .about-hero-copy .kicker {
  margin-bottom: 10px;
}

.page-about .title-display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.4vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.5px;
  margin: 0 0 14px;
  color: var(--ink);
}

.page-about .lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--gray);
  max-width: 60ch;
  margin: 0 0 20px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .about-hero-facts .stat {
  background: var(--paper-soft);
  border: 1.5px solid var(--archive);
  border-left: 4px solid var(--red);
  padding: 12px 14px;
  box-shadow: var(--shadow-stack);
}

.page-about .about-hero-facts .stat:nth-child(2) {
  border-left-color: var(--jade);
}

.page-about .about-hero-facts .stat:nth-child(3) {
  border-left-color: var(--neon);
}

.page-about .about-hero-facts .stat:nth-child(4) {
  border-left-color: var(--gold);
}

.page-about .about-hero-facts .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--red-deep);
}

.page-about .about-hero-facts .stat-num--gold {
  color: var(--red-deep);
  background: linear-gradient(transparent 62%, rgba(232, 176, 75, 0.55) 62%);
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--gray);
}

/* ---------- 版本沿革 ---------- */

.page-about .about-band {
  padding-top: 34px;
}

.page-about .about-band-head {
  display: grid;
  gap: 18px;
}

.page-about .about-band-head .plate {
  margin: 0;
}

.page-about .about-intro {
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--gray);
  max-width: 62ch;
  margin: 0;
}

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

.page-about .plate-cap {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .tband {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: var(--about-gap);
}

.page-about .tband::before {
  content: "";
  position: absolute;
  left: var(--tb-line);
  top: 16px;
  bottom: 16px;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--red) 0%, var(--gold) 52%, var(--jade) 100%);
}

.page-about .tband-item {
  position: relative;
  padding-left: var(--tb-pad);
}

.page-about .tband-item::before {
  content: "";
  position: absolute;
  left: var(--tb-line);
  top: 22px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--gold);
  border: 3px solid var(--red-deep);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .tband-year {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--red-deep);
  margin: 0 0 6px;
}

.page-about .tband-card {
  background: var(--paper);
  border: 1.5px solid var(--archive);
  border-top: 4px solid var(--red);
  padding: 16px 16px 18px;
  box-shadow: var(--shadow-stack);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

.page-about .tband-item:nth-child(2) .tband-card {
  border-top-color: var(--jade);
}

.page-about .tband-item:nth-child(3) .tband-card {
  border-top-color: var(--neon);
}

.page-about .tband-card .card-title {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.35;
  margin: 10px 0 8px;
  color: var(--ink);
}

.page-about .tband-card p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .tband-card .chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .chip {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 9px;
  background: var(--paper-soft);
  border: 1px solid var(--archive);
  color: var(--gray);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .team-lead p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--gray);
  margin: 0 0 14px;
}

.page-about .team-lead .plate {
  margin: 18px 0 0;
}

.page-about .team-cards {
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  background: var(--paper-soft);
  border: 1.5px solid var(--archive);
  border-top: 4px solid var(--jade);
  padding: 15px 16px 16px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-top-color 0.25s ease;
}

.page-about .team-card--red {
  border-top-color: var(--red);
}

.page-about .team-card--gold {
  border-top-color: var(--gold);
}

.page-about .team-card--neon {
  border-top-color: var(--neon);
}

.page-about .team-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 五步流程 ---------- */

.page-about .flow-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-step {
  position: relative;
  background: var(--paper-soft);
  border: 1.5px solid var(--archive);
  padding: 16px 16px 16px 56px;
  box-shadow: var(--shadow-stack);
}

.page-about .flow-num {
  position: absolute;
  left: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--red-deep);
}

.page-about .flow-step h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray);
}

.page-about .flow-note {
  margin: 18px 0 0;
  padding: 12px 14px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
  background: rgba(31, 122, 92, 0.1);
  border-left: 4px solid var(--jade);
}

/* ---------- 标准统一 ---------- */

.page-about .merge-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .merge-node {
  background: var(--paper);
  border: 1.5px solid var(--archive);
  border-left: 5px solid var(--red);
  padding: 16px 18px 18px;
  box-shadow: var(--shadow-stack);
}

.page-about .merge-node--jade {
  border-left-color: var(--jade);
}

.page-about .merge-node h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  margin: 10px 0 8px;
  color: var(--ink);
}

.page-about .merge-node p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .merge-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .merge-points li {
  position: relative;
  padding-left: 24px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .merge-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 4px;
  background: var(--gold);
}

/* ---------- 合作共建 ---------- */

.page-about .coop-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .coop-card {
  background: var(--paper-soft);
  border: 1.5px solid var(--archive);
  border-bottom: 4px solid var(--archive);
  padding: 16px 18px 18px;
  transition: border-bottom-color 0.25s ease, transform 0.25s ease;
}

.page-about .coop-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .coop-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .archive-fold {
  margin-top: 18px;
  border: 1.5px dashed var(--archive);
  background: var(--paper);
  padding: 4px 14px;
}

.page-about .archive-fold summary {
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 17px;
  padding: 12px 0;
  color: var(--red-deep);
}

.page-about .archive-fold-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .local-block {
  display: grid;
  gap: 18px;
  margin-top: 24px;
  padding: 18px;
  background: var(--red-deep);
  border: 1.5px solid var(--red-dark);
}

.page-about .local-block .plate {
  margin: 0;
}

.page-about .local-block .plate-cap {
  color: rgba(247, 242, 231, 0.72);
}

.page-about .local-copy h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .local-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 242, 231, 0.85);
}

.page-about .local-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  padding-bottom: 46px;
}

.page-about .about-cta-inner {
  background: var(--ink);
  border: 1.5px solid var(--red-deep);
  border-left: 6px solid var(--gold);
  padding: 22px 20px 24px;
}

.page-about .about-cta-inner h2 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-cta-inner p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(247, 242, 231, 0.82);
  max-width: 58ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 窄屏微调 ---------- */

@media (max-width: 420px) {
  .page-about .about-hero-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .tband-card,
  .page-about .flow-step,
  .page-about .merge-node,
  .page-about .coop-card {
    padding-left: 14px;
    padding-right: 14px;
  }

  .page-about .flow-step {
    padding-left: 50px;
  }
}

/* ---------- 桌面端 ---------- */

@media (min-width: 860px) {
  .page-about {
    --tb-line: 111px;
    --tb-pad: 0px;
  }

  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-hero-facts {
    gap: 12px;
  }

  .page-about .about-hero-facts .stat {
    padding: 16px 18px;
  }

  .page-about .about-hero-facts .stat-num {
    font-size: 32px;
  }

  .page-about .about-band-head {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: 38px;
    align-items: start;
  }

  .page-about .about-band-head figure {
    transform: rotate(1.4deg);
  }

  .page-about .tband {
    margin-top: 40px;
    gap: 26px;
  }

  .page-about .tband-item {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: 46px;
    align-items: start;
  }

  .page-about .tband-year {
    text-align: right;
    font-size: 22px;
    padding-top: 16px;
    margin: 0;
  }

  .page-about .tband-card {
    padding: 20px 22px 22px;
    transform: rotate(-0.7deg);
    transform-origin: left center;
  }

  .page-about .tband-item:nth-child(even) .tband-card {
    transform: rotate(0.9deg);
  }

  .page-about .tband-item .tband-card:hover {
    transform: rotate(0deg) translateY(-4px);
    box-shadow: var(--shadow-lift);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lift);
  }

  .page-about .flow-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .flow-step {
    padding: 54px 14px 16px;
  }

  .page-about .flow-num {
    left: 14px;
    top: 16px;
  }

  .page-about .merge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .merge-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px 24px;
  }

  .page-about .coop-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .coop-card:hover {
    transform: translateY(-4px);
    border-bottom-color: var(--red);
  }

  .page-about .local-block {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 30px;
    align-items: center;
    padding: 24px;
  }

  .page-about .about-cta-inner {
    padding: 32px 36px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tband-card,
  .page-about .team-card,
  .page-about .coop-card {
    transition: none;
  }

  .page-about .tband-card,
  .page-about .tband-item:nth-child(even) .tband-card,
  .page-about .about-band-head figure {
    transform: none;
  }
}