.page-about {
  --accent: var(--gold);
  --accent-soft: rgba(255, 194, 75, 0.14);
  --accent-line: rgba(255, 194, 75, 0.5);
  --on-accent: #05070D;
  --about-measure: 66ch;
  display: block;
  padding-block: 20px 96px;
  background-image: linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 100%;
  background-position: 0 0;
}

.page-about .about-layout {
  display: block;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  padding-block: 44px 40px;
}

.page-about .about-lead h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 7vw, 66px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 16px 0 22px;
  max-width: 15em;
}

.page-about .about-lead .lede {
  max-width: var(--about-measure);
  color: var(--text);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  margin: 0;
}

.page-about .about-lead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 状态摘要条 ---------- */
.page-about .about-status {
  margin-top: 12px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 4px;
}

.page-about .about-status .status-card {
  padding: 18px 16px;
  background: var(--panel);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: 68px;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-of-type {
  border-top: 0;
  padding-top: 58px;
}

.page-about .about-section .section-head {
  margin-bottom: 30px;
}

.page-about .about-section .section-title {
  max-width: 22em;
}

.page-about .about-section .section-note {
  margin-top: 10px;
}

.page-about .prose {
  max-width: var(--about-measure);
  color: var(--muted);
  line-height: 1.8;
}

.page-about .prose + .prose {
  margin-top: 16px;
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-line {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 24px 18px 26px;
  background: var(--panel);
  transition: background 0.2s var(--ease);
}

.page-about .about-line:hover {
  background: var(--panel-2);
}

.page-about .about-line__no {
  grid-row: 1 / span 2;
  margin: 5px 0 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-line__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 关键数字 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--line);
  border-block: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--bg);
  padding: 24px 16px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-stat__v {
  display: block;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.02em;
}

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

/* ---------- 通用配图 ---------- */
.page-about .about-figure {
  margin: 0 0 36px;
}

.page-about .about-figure .media__frame,
.page-about .about-standard__figure .media__frame {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .media__caption,
.page-about .about-standard__figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 发展脉络时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-line), var(--line));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__node {
  position: absolute;
  left: -30px;
  top: 20px;
  width: 11px;
  height: 11px;
  background: var(--bg);
  border: 1px solid var(--accent-line);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-timeline__item.is-lit .about-timeline__node {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.page-about .about-timeline__head {
  display: grid;
  grid-template-columns: 14px 62px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 4px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  color: var(--text);
  font-family: var(--font-body);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-timeline__head:hover {
  background: rgba(255, 194, 75, 0.06);
}

.page-about .about-timeline__year {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-about .about-timeline__fold .fold__body {
  padding: 16px 4px 26px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-timeline__fold .fold__body p {
  margin: 0 0 12px;
  max-width: var(--about-measure);
}

.page-about .about-timeline__list {
  margin: 0;
}

.page-about .about-timeline__list li {
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 8px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-role {
  position: relative;
  background: var(--panel);
  padding: 26px 20px 24px;
  transition: background 0.2s var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.page-about .about-role:hover {
  background: var(--panel-2);
}

.page-about .about-role:hover::before {
  transform: scaleX(1);
}

.page-about .about-role__k {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent);
  text-transform: none;
}

.page-about .about-role__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-role__duties {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 9px;
}

.page-about .about-role__duties li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.page-about .about-role__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 1px;
  background: var(--accent-line);
}

.page-about .about-role:hover .about-role__duties li {
  color: var(--text);
}

/* ---------- 栏目与内容标准 ---------- */
.page-about .about-standard {
  display: grid;
  gap: 30px;
  margin-bottom: 38px;
}

.page-about .about-standard__figure {
  margin: 0;
}

.page-about .about-standard__text .prose {
  color: var(--text);
}

.page-about .about-standard__text .prose + .prose {
  color: var(--muted);
}

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

.page-about .about-flow__step {
  background: var(--panel);
  padding: 22px 18px 24px;
  border-top: 2px solid var(--accent-line);
}

.page-about .about-flow__no {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 14px;
}

.page-about .about-flow__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promises {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-promise {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-promise__k {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.page-about .about-promise__v {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  max-width: var(--about-measure);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 34px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partner {
  background: var(--panel);
  padding: 24px 20px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-partner__n {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.02em;
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 24px 20px 22px;
  background: var(--panel);
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s var(--ease);
}

.page-about .about-next__card:hover {
  background: var(--panel-2);
}

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

.page-about .about-next__k {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.page-about .about-next__t {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-next__card .link-arrow {
  color: var(--cyan);
  font-size: 14px;
}

/* ---------- 右侧目录 ---------- */
.page-about .about-index {
  display: none;
}

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

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

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

  .page-about .about-promise {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }
}

@media (min-width: 820px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-standard {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about {
    padding-block: 24px 120px;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 196px;
    gap: 60px;
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-index__title {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--muted);
  }

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

  .page-about .about-index__link {
    display: block;
    padding: 8px 8px 8px 12px;
    border-left: 1px solid var(--line);
    font-size: 13px;
    line-height: 1.5;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--text);
    border-left-color: var(--accent);
    background: rgba(255, 194, 75, 0.07);
  }

  .page-about .about-lead {
    padding-block: 56px 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role::before,
  .page-about .about-timeline__node,
  .page-about .about-role__duties li,
  .page-about .about-index__link {
    transition: none;
  }
}