.page-about {
  --about-num-w: 62px;
  --about-aside-w: 264px;
  --about-body-max: 64ch;
}

.page-about .crumbs {
  margin: 22px 0 10px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 14px 0 42px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__copy h1 {
  margin: 10px 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: var(--about-body-max);
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .chapter-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .chapter-item {
  background: var(--ink);
}

.page-about .chapter-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 12px;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .chapter-num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--blue-soft);
}

.page-about .chapter-link:hover,
.page-about .chapter-link:focus-visible {
  background: var(--raise);
  color: var(--flame-2);
}

.page-about .chapter-link:hover .chapter-num,
.page-about .chapter-link:focus-visible .chapter-num {
  color: var(--flame);
}

/* ---------- 图片容器 ---------- */
.page-about .shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.page-about .shot img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .shot--hero { aspect-ratio: 3 / 2; }
.page-about .shot--strip { aspect-ratio: 2 / 1; margin: 20px 0 4px; }
.page-about .shot--team { aspect-ratio: 4 / 3; margin-top: 24px; }

.page-about .media-caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .band {
  display: grid;
  gap: 20px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.page-about .band-num {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .band-num .mono {
  color: var(--flame);
  font-size: 12px;
}

.page-about .band-main h2.section-title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .band-main p {
  margin: 0 0 14px;
  max-width: var(--about-body-max);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .band-main p.lede {
  color: var(--muted);
}

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

.page-about .band-main a {
  color: var(--blue-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 209, 255, 0.4);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .band-main a:hover,
.page-about .band-main a:focus-visible {
  color: var(--flame-2);
  border-bottom-color: var(--flame);
}

/* ---------- 右栏注释与数据卡 ---------- */
.page-about .band-aside {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .note-card {
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue);
}

.page-about .note-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-soft);
}

.page-about .note-card p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .stat-grid {
  display: grid;
  gap: 10px;
}

.page-about .stat-card {
  padding: 15px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .stat-card:hover {
  border-color: rgba(255, 75, 31, 0.5);
  transform: translateY(-2px);
}

.page-about .stat-num {
  display: block;
  font-size: 32px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--flame);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 覆盖字段清单 ---------- */
.page-about .field-list {
  list-style: none;
  margin: 20px 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .field-list li {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  background: var(--ink);
}

.page-about .field-key {
  font-weight: 700;
  font-size: 14.5px;
  color: var(--text);
}

.page-about .field-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--flame) 0%, var(--blue) 52%, var(--line) 100%);
  opacity: 0.6;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--flame);
  border-color: var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 75, 31, 0.16);
}

.page-about .tl-item.is-now::before {
  background: var(--flame);
  border-color: var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 75, 31, 0.18);
}

.page-about .tl-year {
  display: inline-block;
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--blue-soft);
}

.page-about .tl-item.is-now .tl-year {
  color: var(--flame);
}

.page-about .tl-body h3 {
  margin: 6px 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}

.page-about .tl-body p {
  margin: 0;
  max-width: var(--about-body-max);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .tl-hint {
  margin-top: 6px !important;
  font-size: 13px !important;
  color: var(--muted);
  border-left: 1px solid var(--line);
  padding-left: 10px;
}

/* ---------- 团队分工折叠卡 ---------- */
.page-about .role {
  margin-top: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .role:hover {
  border-color: rgba(58, 74, 66, 1);
  background: var(--raise);
}

.page-about .role[open] {
  border-color: rgba(255, 75, 31, 0.45);
  background: var(--panel);
}

.page-about .role-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
}

.page-about .role-head::-webkit-details-marker {
  display: none;
}

.page-about .role-head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.page-about .role[open] .role-head::after {
  content: "−";
  color: var(--flame);
}

.page-about .role-idx {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--blue-soft);
}

.page-about .role-name {
  flex: 1;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .role-count {
  font-size: 13px;
  color: var(--flame);
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0 16px 14px 38px;
}

.page-about .role-list li {
  position: relative;
  padding: 4px 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .role-list li::before {
  content: "";
  position: absolute;
  left: -13px;
  top: 12px;
  width: 6px;
  height: 1px;
  background: var(--line);
}

/* ---------- 四步流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .flow-step {
  padding: 16px 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--blue);
  transition: border-top-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .flow-step:hover {
  border-top-color: var(--flame);
  transform: translateY(-2px);
}

.page-about .flow-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--blue-soft);
}

.page-about .flow-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin: 10px 0 64px;
  padding: 26px 22px;
  background: linear-gradient(135deg, var(--panel) 0%, var(--ink) 62%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--flame);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-cta__actions .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.page-about .about-cta__actions .btn--flame {
  background: var(--flame);
  border-color: var(--flame);
  color: #120704;
}

.page-about .about-cta__actions .btn--flame:hover,
.page-about .about-cta__actions .btn--flame:focus-visible {
  background: var(--flame-2);
  border-color: var(--flame-2);
}

.page-about .about-cta__actions .btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

.page-about .about-cta__actions .btn--ghost:hover,
.page-about .about-cta__actions .btn--ghost:focus-visible {
  border-color: var(--flame);
  color: var(--flame-2);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .chapter-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 30px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 46px;
    align-items: start;
    padding: 18px 0 60px;
  }

  .page-about .band {
    grid-template-columns: var(--about-num-w) minmax(0, 1fr) var(--about-aside-w);
    gap: 0 36px;
    padding: 52px 0;
  }

  .page-about .band--wide {
    grid-template-columns: var(--about-num-w) minmax(0, 1fr);
  }

  .page-about .band-num {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    align-self: start;
    position: sticky;
    top: 78px;
    padding-top: 4px;
    letter-spacing: 0.3em;
  }

  .page-about .band-aside {
    padding-top: 44px;
  }

  .page-about .tl-hint {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease),
      margin-top 0.28s var(--ease);
  }

  .page-about .tl-item:hover .tl-hint,
  .page-about .tl-item:focus-within .tl-hint {
    max-height: 96px;
    opacity: 1;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    gap: 58px;
  }

  .page-about .band {
    gap: 0 48px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-link,
  .page-about .stat-card,
  .page-about .role,
  .page-about .role-head::after,
  .page-about .flow-step,
  .page-about .tl-item::before,
  .page-about .tl-hint,
  .page-about .about-cta__actions .btn {
    transition: none;
  }

  .page-about .stat-card:hover,
  .page-about .flow-step:hover {
    transform: none;
  }
}
<<<END>>>