.page-about {
  background: var(--ivory);
  color: var(--ink);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about a:focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: clamp(18px, 3vw, 32px) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-55);
}

.page-about .about-crumbs a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .about-crumbs a:hover {
  color: var(--pulse-deep);
  border-bottom-color: var(--pulse);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  padding-block: clamp(24px, 4vw, 48px) clamp(18px, 3vw, 28px);
}

.page-about .about-kicker {
  margin: 0;
  color: var(--pulse-deep);
}

.page-about .about-title {
  margin: 12px 0 0;
  max-width: 15ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 70px);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(20px, 4vw, 46px);
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .stat-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}

.page-about .stat-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-55);
}

.page-about .figure-hero {
  margin: 0;
}

.page-about .figure-hero img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 91%, 0 100%);
}

.page-about figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-55);
}

/* ---------- 年份快速跳转 ---------- */
.page-about .about-jump {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 clamp(20px, 3vw, 32px);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-jump a {
  flex: 0 0 auto;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-jump a:hover {
  background: var(--tint);
  border-color: var(--pulse);
  color: var(--pulse-deep);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(30px, 5vw, 60px);
}

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.6vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.page-about .about-sub {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .about-h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.42;
  letter-spacing: -0.01em;
}

/* ---------- 年份时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, var(--pulse) 0%, var(--line) 22%, var(--line) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(32px, 4.6vw, 56px) 30px;
  scroll-margin-top: calc(var(--bar-h) + 28px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--node-color, var(--pulse));
  box-shadow: 0 0 0 4px var(--node-halo, var(--ivory));
  transition: transform 0.18s ease;
}

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

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(44px, 11vw, 68px);
  line-height: 0.9;
  letter-spacing: -0.055em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  transition: color 0.18s ease;
}

.page-about .tl-item:hover .tl-year {
  color: var(--pulse-deep);
}

.page-about .tl-item:target .tl-year {
  color: var(--pulse-deep);
}

.page-about .tl-body {
  margin-top: 12px;
}

.page-about .tl-text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .tl-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-55);
}

.page-about .tl-link {
  margin: 12px 0 0;
  font-size: 15px;
}

.page-about .link-pulse {
  color: var(--pulse-deep);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .link-pulse:hover {
  color: var(--pulse);
}

.page-about .tl-item--ice {
  --node-halo: var(--ice);
  margin-bottom: clamp(24px, 4vw, 44px);
  padding: clamp(18px, 2.6vw, 26px) clamp(16px, 2.6vw, 26px) clamp(20px, 3vw, 28px) 30px;
  background: var(--ice);
  border-radius: var(--radius);
}

.page-about .tl-item--night {
  --node-halo: var(--night);
  --node-color: var(--amber);
  padding: clamp(20px, 3vw, 30px) clamp(18px, 2.8vw, 28px) clamp(22px, 3.2vw, 32px) 30px;
  background: var(--night);
  color: var(--ivory);
  border-radius: var(--radius);
}

.page-about .tl-item--night .about-h3,
.page-about .tl-item--night .tl-year {
  color: var(--ivory);
}

.page-about .tl-item--night:hover .tl-year,
.page-about .tl-item--night:target .tl-year {
  color: var(--amber);
}

.page-about .tl-item--night .tl-text {
  color: var(--ivory-70);
}

.page-about .tl-item--night .tl-meta {
  color: var(--ivory-46);
}

.page-about .tl-item--night a {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .tl-item--night a:hover {
  color: var(--ivory);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: clamp(10px, 2vw, 24px) 0 clamp(20px, 3vw, 36px);
  padding: clamp(22px, 3.6vw, 40px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(21px, 3.6vw, 34px);
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.page-about .about-quote footer {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-55);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
}

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

.page-about .roster li {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 2vw, 18px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .roster-name {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2.3vw, 21px);
  letter-spacing: -0.025em;
}

.page-about .roster-idx {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--pulse-deep);
}

.page-about .roster p {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .figure-side {
  margin: 0;
}

.page-about .figure-side img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(18, 18, 20, 0.08);
}

/* ---------- 三级审核 ---------- */
.page-about .audit {
  display: grid;
  gap: 12px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .audit li {
  padding: 16px 18px;
  background: var(--ivory-deep);
  border-left: 3px solid var(--pulse);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .audit-step {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--pulse-deep);
}

.page-about .audit strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.page-about .audit p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-70);
}

/* ---------- 合作生态 ---------- */
.page-about .coop {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
}

.page-about .coop-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .coop-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px;
  background: var(--ivory);
}

.page-about .figure-net {
  margin: 0;
}

.page-about .figure-net img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: var(--night);
}

/* ---------- 服务原则 ---------- */
.page-about .principles {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .principles li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px 18px;
  align-items: start;
  padding: clamp(16px, 2.4vw, 22px);
  background: rgba(255, 255, 255, 0.42);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.page-about .principles li:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(18, 18, 20, 0.08);
  border-color: var(--ink-55);
}

.page-about .p-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--pulse-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .principles h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.page-about .principles p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-70);
}

/* ---------- 纠错面板 ---------- */
.page-about .fix-panel {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3.4vw, 34px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--tint);
  border-radius: var(--radius);
}

.page-about .fix-panel h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.3vw, 22px);
  line-height: 1.4;
}

.page-about .fix-panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .fix-mail {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink);
  word-break: break-all;
}

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

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: clamp(20px, 3vw, 32px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-stats {
    gap: 14px 34px;
  }

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

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .coop {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: center;
  }

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

  .page-about .tl-item {
    display: grid;
    grid-template-columns: minmax(160px, 230px) minmax(0, 1fr);
    column-gap: clamp(26px, 4vw, 64px);
    align-items: start;
    padding-left: 40px;
  }

  .page-about .tl-item--ice,
  .page-about .tl-item--night {
    padding-left: 40px;
  }

  .page-about .tl-item::before {
    top: 30px;
  }

  .page-about .tl-year {
    font-size: clamp(56px, 7vw, 100px);
  }

  .page-about .tl-body {
    margin-top: 4px;
  }

  .page-about .tl-item:nth-child(odd) .tl-text {
    max-width: 64ch;
  }

  .page-about .tl-item:nth-child(even) .tl-text {
    max-width: 52ch;
  }

  .page-about .tl-item:nth-child(even) .tl-body {
    margin-left: clamp(0px, 2vw, 26px);
  }

  .page-about .fix-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: clamp(24px, 3vw, 40px);
  }

  .page-about .fix-panel h3,
  .page-about .fix-panel p {
    grid-column: 1 / -1;
  }

  .page-about .fix-actions {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }

  .page-about .principles li:hover,
  .page-about .tl-item:hover::before {
    transform: none;
  }
}