.page-about {
  --about-index-w: 236px;
  --about-gap: 46px;
  display: block;
  padding-bottom: 88px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(14px, 2.6vw, 32px);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 18px;
}

.page-about .about-lede {
  max-width: 60ch;
  margin: 18px 0 0;
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero-meta {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--glass);
}

.page-about .about-hero-meta-k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--cyan-deep);
}

.page-about .about-hero-meta-v {
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
}

.page-about .about-hero-figure {
  margin: 30px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  margin-top: clamp(38px, 5vw, 66px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .about-index {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  padding: 20px 18px;
}

.page-about .about-index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.5;
  transition: background-color .18s ease, color .18s ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  background: rgba(43, 245, 200, .08);
  color: var(--text);
}

.page-about .about-toc-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-index-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section + .about-section {
  margin-top: 54px;
}

.page-about .about-section .band {
  margin-bottom: 26px;
  border-radius: 4px;
}

.page-about .about-section-head {
  margin-bottom: 24px;
}

.page-about .about-section-head .chapter-num {
  display: block;
  margin-bottom: 8px;
}

.page-about .about-section-head .section-title {
  margin: 0;
}

.page-about .about-section-head .lede {
  margin: 14px 0 0;
  max-width: 62ch;
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.76;
  color: var(--text);
}

.page-about .about-p:last-child {
  margin-bottom: 0;
}

.page-about .about-p--foot {
  margin-top: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 245, 200, .38);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 01 原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-principle {
  position: relative;
  overflow: hidden;
  padding: 20px 20px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 0;
  bottom: 0;
  width: 7px;
  background: var(--cyan);
  transform: skewX(-12deg);
  opacity: .9;
}

.page-about .about-principle-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--cyan-deep);
}

.page-about .about-principle h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 02 筛选 + 表格 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .filter-btn {
  appearance: none;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  line-height: 1.2;
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .filter-btn:hover,
.page-about .filter-btn:focus-visible {
  color: var(--text);
  border-color: var(--cyan-deep);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
}

.page-about .table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
}

.page-about .data-table caption {
  caption-side: top;
  text-align: left;
  padding: 15px 16px 13px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .data-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--muted);
  white-space: nowrap;
  background: rgba(10, 35, 28, .78);
}

.page-about .data-table tbody th {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.page-about .data-table tbody td {
  color: var(--muted);
  line-height: 1.6;
}

.page-about .data-table tbody tr:hover th,
.page-about .data-table tbody tr:hover td {
  background: rgba(43, 245, 200, .04);
}

.page-about .data-table tbody tr:last-child th,
.page-about .data-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .data-table a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 245, 200, .34);
}

.page-about .data-table a:hover,
.page-about .data-table a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 03 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-flow-step {
  position: relative;
  padding-left: 46px;
}

.page-about .about-flow-node {
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: rgba(43, 245, 200, .12);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .02em;
}

.page-about .about-flow-step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 14px;
  top: 36px;
  bottom: -22px;
  width: 2px;
  background: linear-gradient(180deg, var(--line), rgba(20, 53, 43, .18));
}

.page-about .about-flow-label {
  display: block;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-flow-desc {
  display: block;
  margin-top: 6px;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

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

.page-about .about-figure-cap {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.66;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* 旁注 */
.page-about .about-note-pop {
  position: relative;
  display: inline-block;
  color: var(--cyan);
  border-bottom: 1px dashed rgba(43, 245, 200, .5);
  cursor: help;
}

.page-about .about-note-pop-body {
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  z-index: 8;
  width: min(300px, 76vw);
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--ink-2);
  color: var(--text);
  font-size: 13px;
  line-height: 1.68;
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}

.page-about .about-note-pop:hover .about-note-pop-body,
.page-about .about-note-pop:focus-visible .about-note-pop-body,
.page-about .about-note-pop:focus-within .about-note-pop-body {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .about-figure--team {
  margin-top: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .about-stats .stat {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--ink-2);
}

.page-about .about-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 38px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats .stat-label {
  display: block;
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 05 分工 ---------- */
.page-about .about-scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-scope-list a {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--glass);
  text-decoration: none;
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .about-scope-list a:hover,
.page-about .about-scope-list a:focus-visible {
  border-color: var(--cyan-deep);
  background: rgba(43, 245, 200, .06);
}

.page-about .about-scope-k {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-scope-k::after {
  content: "→";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
}

.page-about .about-scope-d {
  display: block;
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-principles {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-flow-step {
    padding: 48px 18px 0 0;
  }

  .page-about .about-flow-step:not(:last-child)::after {
    left: 34px;
    right: 0;
    top: 15px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--line), rgba(20, 53, 43, .18));
  }

  .page-about .about-flow-desc {
    max-width: 30ch;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 30px;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-space, 104px) + 14px);
    max-height: calc(100vh - var(--header-space, 104px) - 40px);
    overflow-y: auto;
  }

  .page-about .about-section + .about-section {
    margin-top: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .filter-btn,
  .page-about .about-scope-list a,
  .page-about .about-note-pop-body {
    transition: none;
  }
}