.page-about {
  --about-rail: 220px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about [data-spy-target] {
  scroll-margin-top: calc(var(--header-h, 92px) + 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h, 88px) + 30px) 0 56px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.42;
  pointer-events: none;
}

.page-about .about-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 74% 46%;
}

.page-about .about-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    var(--paper) 18%,
    rgba(247, 243, 234, 0.66) 56%,
    rgba(247, 243, 234, 0.06) 100%
  );
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin: 0 0 24px;
}

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

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cinnabar);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(36px, 8.4vw, 74px);
  line-height: 1.14;
  letter-spacing: 0.01em;
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero-note {
  display: none;
}

/* ---------- 章节索引轴 ---------- */
.page-about .about-body {
  padding: 0 0 12px;
}

.page-about .about-body-inner {
  display: grid;
  gap: 6px;
}

.page-about .about-rail {
  padding: 18px 0 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.page-about .about-rail-list {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-link {
  display: inline-block;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .rail-num {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible,
.page-about .about-rail-link[aria-current="true"] {
  color: var(--cinnabar);
}

.page-about .about-rail-link[aria-current="true"] .rail-num {
  color: var(--cinnabar);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 46px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
}

.page-about .about-sec-head {
  margin-bottom: 26px;
}

.page-about .chapter-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--cinnabar);
}

.page-about .about-sec-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.32;
}

.page-about .about-text {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-text p {
  margin: 0 0 16px;
}

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

.page-about .about-text a {
  color: var(--cinnabar-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(178, 58, 46, 0.4);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.page-about .about-text--tight {
  margin-top: 26px;
}

.page-about .about-lead-word::first-letter {
  float: left;
  margin: 6px 12px 0 0;
  font-family: var(--font-display);
  font-size: 3.1em;
  line-height: 0.86;
  color: var(--cinnabar);
}

.page-about .about-quote {
  margin: 30px 0 0;
  padding: 20px 22px;
  border-left: 3px solid var(--cinnabar);
  background: var(--white);
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 25px);
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-footnote {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-footnote a {
  color: var(--cinnabar-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(178, 58, 46, 0.4);
}

/* ---------- 场景列表 ---------- */
.page-about .scene-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .scene-item {
  position: relative;
  padding: 15px 0 15px 26px;
  border-bottom: 1px dashed var(--line);
  transition: background-color 0.2s var(--ease);
}

.page-about .scene-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 23px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--celadon);
  border-radius: 50%;
  transition: background-color 0.18s var(--ease);
}

.page-about .scene-item:hover::before,
.page-about .scene-item:focus::before,
.page-about .scene-item:focus-within::before {
  background: var(--celadon);
}

.page-about .scene-name {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .scene-note {
  display: block;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease);
}

.page-about .scene-item:hover .scene-note,
.page-about .scene-item:focus .scene-note,
.page-about .scene-item:focus-within .scene-note {
  max-height: 140px;
  margin-top: 6px;
  opacity: 1;
}

/* ---------- 索引方法 ---------- */
.page-about .about-method-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-method-media {
  margin: 0;
}

.page-about .about-method-media img,
.page-about .about-team-media img {
  border: 1px solid var(--line);
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.page-about .method-steps {
  display: grid;
  gap: 20px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .method-step {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.page-about .step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.page-about .method-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .method-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-team-media {
  margin: 0;
}

.page-about .team-groups {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .team-group {
  padding: 20px 18px;
  background: rgba(20, 32, 31, 0.045);
  border: 1px solid var(--line);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .team-group:hover,
.page-about .team-group:focus,
.page-about .team-group:focus-within {
  border-color: var(--cinnabar);
  background: var(--white);
}

.page-about .team-group-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-group-name::after {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-top: 10px;
  background: var(--gold);
  transition: width 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .team-group:hover .team-group-name::after,
.page-about .team-group:focus-within .team-group-name::after {
  width: 52px;
  background: var(--cinnabar);
}

.page-about .team-group-line {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 里程碑 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(199, 162, 90, 0.12));
}

.page-about .about-mile {
  position: relative;
  padding: 0 0 30px 28px;
}

.page-about .about-mile:last-child {
  padding-bottom: 0;
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .mile-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cinnabar);
}

.page-about .mile-body {
  margin-top: 10px;
  padding: 16px 18px;
  background: rgba(20, 32, 31, 0.06);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .mile-ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cinnabar-deep);
  border: 1px solid rgba(178, 58, 46, 0.42);
}

.page-about .mile-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 覆盖数据 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-stat {
  padding: 24px 18px;
  background: var(--paper);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1;
  color: var(--cinnabar);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .stat-note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 收尾面板 ---------- */
.page-about .about-sec--last {
  border-top: 1px solid var(--line);
}

.page-about .about-close-panel {
  padding: 32px 22px;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-close-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--gold);
}

.page-about .about-close-title {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.34;
  color: var(--paper);
}

.page-about .about-close-text {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.82);
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-close-panel .btn--line {
  color: var(--paper);
  border-color: var(--line-light);
}

.page-about .about-close-panel .btn--line:hover,
.page-about .about-close-panel .btn--line:focus-visible {
  color: var(--paper);
  border-color: var(--gold);
}

.page-about .about-close-note {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-light);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(247, 243, 234, 0.66);
}

.page-about .about-close-note a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(199, 162, 90, 0.5);
}

.page-about .about-close-note a:hover,
.page-about .about-close-note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .method-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 32px;
  }

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

  .page-about .about-close-panel {
    padding: 44px 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--header-h, 92px) + 48px) 0 84px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 48px;
  }

  .page-about .about-hero h1 {
    max-width: 14em;
  }

  .page-about .about-hero-note {
    display: block;
    writing-mode: vertical-rl;
    max-height: 300px;
    margin: 6px 0 0;
    padding: 4px 0 4px 12px;
    border-left: 1px solid var(--line-strong);
    font-size: 12px;
    letter-spacing: 0.34em;
    line-height: 1;
    color: var(--ink-soft);
  }

  .page-about .about-body-inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h, 92px) + 30px);
    padding: 58px 0 0;
    border-bottom: 0;
  }

  .page-about .about-rail-list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail-link {
    display: block;
    padding: 10px 0 10px 14px;
    border-left: 2px solid transparent;
    letter-spacing: 0.1em;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail-link[aria-current="true"] {
    border-left-color: var(--cinnabar);
  }

  .page-about .about-sec {
    padding: 66px 0;
  }

  .page-about .about-sec-head {
    margin-bottom: 32px;
  }

  .page-about .about-method-grid,
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-method-media,
  .page-about .about-team-media {
    margin-top: 6px;
  }

  .page-about .team-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 38px;
  }

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

  .page-about .about-timeline {
    margin-top: 40px;
  }

  .page-about .about-mile {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 24px;
    padding-left: 30px;
    padding-bottom: 36px;
  }

  .page-about .mile-body {
    margin-top: 0;
  }

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

  .page-about .about-close-panel {
    padding: 56px 52px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-sec-title {
    max-width: 20em;
  }

  .page-about .about-text {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .scene-note,
  .page-about .team-group,
  .page-about .team-group-name::after,
  .page-about .about-rail-link {
    transition: none;
  }
}