.page-about {
  --about-line-mobile: 52px;
  --about-line-desktop: 64px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  background: var(--paper-2);
  border-bottom: var(--bw) solid var(--ink);
  padding: calc(var(--header-h) + 20px) 0 40px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--gray);
}

.page-about .breadcrumb a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 26px;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 10px;
}

.page-about .eyebrow--light {
  color: var(--mint);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.5vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

.page-about .about-lead {
  font-size: 17px;
  line-height: 1.75;
  max-width: 60ch;
  margin: 0 0 14px;
  color: var(--ink-2);
}

.page-about .about-lead--small {
  font-size: 15px;
  color: var(--gray);
  margin-bottom: 0;
}

.page-about .about-hero-note {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--r);
  padding: 20px 20px 18px;
  box-shadow: 6px 6px 0 var(--green);
}

.page-about .note-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint);
  margin: 0 0 14px;
}

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

.page-about .note-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px dashed rgba(253, 248, 240, 0.28);
  padding-bottom: 9px;
}

.page-about .note-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .note-k {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--coral);
  min-width: 66px;
}

.page-about .note-v {
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-figure {
  margin: 30px 0 0;
  border: var(--bw) solid var(--ink);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--hard);
  background: var(--paper);
}

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

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
  padding: 10px 14px;
  border-top: 2px solid var(--ink);
  background: var(--paper-2);
}

/* ---------- 上半区：正文 + 目录 ---------- */
.page-about .about-top {
  display: grid;
  gap: 34px;
  padding: 44px 0 8px;
}

.page-about .about-top-main {
  min-width: 0;
}

.page-about .about-sec {
  padding: 0 0 40px;
}

.page-about .about-sec + .about-sec {
  border-top: 2px dashed rgba(36, 52, 74, 0.25);
  padding-top: 38px;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 32px);
  line-height: 1.2;
  margin: 0 0 14px;
}

.page-about .about-sec-intro {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
  max-width: 62ch;
  margin: 0 0 22px;
}

.page-about .prose p {
  font-size: 17px;
  line-height: 1.78;
  max-width: 66ch;
  margin: 0 0 16px;
  color: var(--ink-2);
}

.page-about .prose a {
  color: var(--green);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-line-mobile);
  top: 12px;
  bottom: 16px;
  width: 3px;
  background: var(--ink-2);
  border-radius: 2px;
}

.page-about .tl-item {
  position: relative;
  padding-left: calc(var(--about-line-mobile) + 24px);
  padding-bottom: 20px;
  list-style: none;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-line-mobile) - 7px);
  top: 8px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--coral);
  transition: transform 160ms ease-out;
}

.page-about .tl-year {
  position: absolute;
  left: 0;
  top: 6px;
  width: var(--about-line-mobile);
  margin-left: -10px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-2);
}

.page-about .tl-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--r);
  padding: 14px 16px;
  box-shadow: var(--hard-sm);
  transition: transform 140ms ease-out, box-shadow 140ms ease-out;
}

.page-about .tl-kicker {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .tl-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .tl-item:hover::before {
  transform: scale(1.25);
}

.page-about .tl-item:hover .tl-card {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--green);
}

/* ---------- 侧栏 ---------- */
.page-about .about-aside {
  display: grid;
  gap: 18px;
  align-content: start;
  min-width: 0;
}

.page-about .aside-card {
  border: var(--bw) solid var(--ink);
  border-radius: var(--r);
  background: var(--paper-2);
  padding: 18px;
  box-shadow: var(--hard-sm);
}

.page-about .aside-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gray);
  margin: 0 0 12px;
}

.page-about .aside-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .aside-index a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 6px;
  border-radius: var(--r-sm);
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  transition: background 120ms ease-out, color 120ms ease-out;
}

.page-about .aside-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--coral);
  font-weight: 700;
}

.page-about .aside-index a:hover,
.page-about .aside-index a:focus-visible {
  background: var(--green-soft);
  color: var(--ink);
}

.page-about .aside-note {
  border-left: var(--bw) solid var(--green);
  background: var(--paper);
  padding: 14px 16px;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .aside-note-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  margin: 0 0 6px;
}

.page-about .aside-note p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0;
}

.page-about .aside-note a {
  color: var(--green);
  font-weight: 600;
}

/* ---------- 准则横通栏 ---------- */
.page-about .about-band {
  background: var(--ink);
  color: var(--paper);
  padding: 46px 0 50px;
  border-top: var(--bw) solid var(--ink);
  border-bottom: var(--bw) solid var(--ink);
}

.page-about .band-head h2 {
  color: var(--paper);
}

.page-about .band-sub {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(253, 248, 240, 0.78);
  max-width: 56ch;
  margin: 0 0 28px;
}

.page-about .band-grid {
  display: grid;
  gap: 20px;
}

.page-about .principle {
  background: var(--paper);
  color: var(--ink);
  border: var(--bw) solid var(--paper);
  border-radius: var(--r-lg);
  padding: 22px 20px 20px;
  box-shadow: 6px 6px 0 var(--coral);
  transition: transform 140ms ease-out, box-shadow 140ms ease-out;
}

.page-about .principle-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--coral);
  margin: 0 0 8px;
  padding-bottom: 8px;
  border-bottom: 2px dashed rgba(36, 52, 74, 0.3);
}

.page-about .principle h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  margin: 0 0 10px;
}

.page-about .principle p:last-child {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
  margin: 0;
}

.page-about .principle a {
  color: var(--green);
  font-weight: 600;
}

.page-about .principle:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--coral);
}

/* ---------- 团队 ---------- */
.page-about .about-team,
.page-about .about-partners {
  display: grid;
  gap: 28px;
  padding: 44px 0 8px;
  border-top: 2px dashed rgba(36, 52, 74, 0.25);
}

.page-about .team-copy,
.page-about .partners-copy {
  min-width: 0;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .team-row {
  border: 2px solid var(--ink);
  border-radius: var(--r);
  padding: 14px 16px;
  background: var(--paper);
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 9px;
}

.page-about .team-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray);
  border: 2px solid var(--ink-2);
  border-radius: 6px;
  padding: 1px 6px;
}

.page-about .team-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
}

.page-about .team-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--coral);
}

.page-about .team-bar {
  height: 12px;
  border: 2px solid var(--ink);
  border-radius: 99px;
  background: var(--paper-2);
  overflow: hidden;
  margin-bottom: 9px;
}

.page-about .team-fill {
  display: block;
  height: 100%;
  border-radius: 99px;
}

.page-about .team-fill--1 { width: 37%; background: var(--green); }
.page-about .team-fill--2 { width: 29%; background: var(--green-soft); }
.page-about .team-fill--3 { width: 24%; background: var(--mint); }
.page-about .team-fill--4 { width: 10%; background: var(--coral-soft); }

.page-about .team-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0;
}

.page-about .about-figure--team,
.page-about .about-figure--net {
  margin: 0;
  align-self: start;
}

/* ---------- 合作 ---------- */
.page-about .partner-split {
  display: grid;
  gap: 14px;
  margin-bottom: 26px;
}

.page-about .partner-cell {
  border: 2px solid var(--ink);
  border-radius: var(--r);
  padding: 16px;
  background: var(--paper);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .partner-cell--green {
  background: var(--green-soft);
  box-shadow: var(--hard-sm);
}

.page-about .partner-cell p {
  margin: 0;
}

.page-about .partner-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  font-weight: 700;
  margin-bottom: 6px !important;
}

.page-about .partners-sub {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  margin: 0 0 14px;
}

.page-about .partner-steps {
  list-style: none;
  margin: 0 0 16px;
  padding: 0 0 0 16px;
  border-left: 3px solid var(--coral);
  display: grid;
  gap: 12px;
}

.page-about .partner-steps li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--coral);
  margin-right: 8px;
}

.page-about .partner-steps strong {
  color: var(--ink);
}

.page-about .partners-tail {
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
  margin: 0;
}

.page-about .partners-tail a {
  color: var(--green);
  font-weight: 600;
}

/* ---------- 数据区 ---------- */
.page-about .about-metrics {
  margin: 44px 0 0;
  padding: 30px 20px;
  border: var(--bw) solid var(--ink);
  border-radius: var(--r-lg);
  background: var(--paper-2);
  box-shadow: var(--hard);
}

.page-about .metrics-head h2 {
  margin-bottom: 10px;
}

.page-about .metrics-head .about-sec-intro {
  margin-bottom: 24px;
}

.page-about .metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .metric {
  border-top: 3px solid var(--ink);
  padding-top: 10px;
  min-width: 0;
}

.page-about .metric-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 7vw, 40px);
  line-height: 1.05;
  color: var(--ink);
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .metric-unit {
  font-size: 14px;
  font-weight: 700;
  color: var(--coral);
}

.page-about .metric-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray);
  margin: 0;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 44px 0 8px;
}

.page-about .about-next h2 {
  margin-bottom: 20px;
}

.page-about .next-grid {
  display: grid;
  gap: 14px;
}

.page-about .next-card {
  display: grid;
  gap: 6px;
  border: var(--bw) solid var(--ink);
  border-radius: var(--r);
  background: var(--paper);
  padding: 16px 18px;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--hard-sm);
  transition: transform 120ms ease-out, box-shadow 120ms ease-out, background 120ms ease-out;
}

.page-about .next-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--green);
}

.page-about .next-card strong {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
}

.page-about .next-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--green);
  background: var(--paper-2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .partner-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 28px) 0 52px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .about-top {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 48px;
    padding: 60px 0 12px;
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-about .about-timeline::before {
    left: var(--about-line-desktop);
  }

  .page-about .tl-item {
    padding-left: calc(var(--about-line-desktop) + 28px);
  }

  .page-about .tl-item::before {
    left: calc(var(--about-line-desktop) - 7px);
  }

  .page-about .tl-year {
    width: var(--about-line-desktop);
    margin-left: -8px;
  }

  .page-about .band-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }

  .page-about .principle:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .principle:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-team,
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 44px;
    padding: 56px 0 12px;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .about-metrics {
    margin: 56px 0 0;
    padding: 40px 36px;
  }

  .page-about .about-next {
    padding: 56px 0 12px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .principle,
  .page-about .next-card,
  .page-about .tl-item::before {
    transition: none;
  }

  .page-about .tl-item:hover .tl-card,
  .page-about .principle:hover,
  .page-about .next-card:hover,
  .page-about .tl-item:hover::before {
    transform: none;
  }
}