.page-about {
  --rail-w: 168px;
  --chapter-gap: clamp(52px, 6.5vw, 92px);
  --about-serif: var(--font-serif);
  background: var(--ink-900);
  color: var(--cloud-100);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-open {
  padding-top: clamp(34px, 5vw, 72px);
  padding-bottom: clamp(24px, 3.5vw, 44px);
}

.page-about .about-open__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--cloud-100);
  max-width: 18ch;
}

.page-about .about-open__lead {
  margin: 26px 0 0;
  max-width: 60ch;
  font-family: var(--about-serif);
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.92;
  color: var(--mist-300);
}

.page-about .about-open__meta {
  margin: 28px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-300);
}

.page-about .about-open__meta span {
  position: relative;
  padding-left: 14px;
}

.page-about .about-open__meta span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--gold-500);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  margin-top: clamp(30px, 4vw, 50px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(227, 182, 120, 0.18);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
}

.page-about .about-index__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 20px;
  background: rgba(8, 24, 43, 0.78);
  text-decoration: none;
  color: var(--cloud-100);
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  background: rgba(200, 135, 60, 0.16);
}

.page-about .about-index__year {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--gold-500);
}

.page-about .about-index__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14.5px;
  line-height: 1.45;
}

@media (min-width: 720px) {
  .page-about .about-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 52px);
  padding-top: clamp(46px, 6vw, 84px);
  padding-bottom: clamp(60px, 7vw, 100px);
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.4vw, 68px);
  }
}

/* ---------- 年份坐标 ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1040px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 118px;
    align-self: start;
  }
}

.page-about .about-rail__label {
  margin: 0;
  color: var(--gold-500);
}

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

.page-about .about-rail__link {
  position: relative;
  display: block;
  padding: 9px 0 9px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-300);
  text-decoration: none;
  border-left: 1px solid rgba(147, 166, 192, 0.22);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border-radius: 50%;
  background: rgba(147, 166, 192, 0.4);
  transition: background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible,
.page-about .about-rail__link.is-active {
  color: var(--gold-300);
  border-left-color: var(--gold-500);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before,
.page-about .about-rail__link.is-active::before {
  background: var(--gold-500);
  transform: scale(1.35);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding-bottom: var(--chapter-gap);
  scroll-margin-top: 120px;
}

.page-about .about-chapter__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-500);
  border: 1px solid rgba(200, 135, 60, 0.42);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
}

.page-about .about-chapter__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.1vw, 33px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--cloud-100);
  max-width: 24ch;
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  max-width: 54ch;
  font-family: var(--about-serif);
  font-size: clamp(16px, 1.25vw, 17.5px);
  line-height: 1.9;
  color: var(--gold-300);
}

.page-about .about-chapter .prose {
  margin-top: 20px;
  max-width: 68ch;
}

.page-about .about-chapter .prose p {
  font-family: var(--about-serif);
  font-size: 16.5px;
  line-height: 1.92;
  color: var(--mist-300);
}

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

/* ---------- 米纸白引用 ---------- */
.page-about .about-quote {
  margin: 34px 0 0;
  padding: clamp(22px, 3vw, 34px) clamp(22px, 3.2vw, 42px);
  max-width: 34ch;
  background: var(--paper);
  color: var(--ink-900);
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.3vw, 26px);
  line-height: 1.45;
  letter-spacing: -0.01em;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 34px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about .about-figure .img-frame__cap {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist-300);
}

/* ---------- 团队占比条 ---------- */
.page-about .team-bars {
  margin-top: 30px;
  display: grid;
  gap: 22px;
}

.page-about .team-bar {
  padding: 4px 0;
  transition: transform 180ms var(--ease);
}

.page-about .team-bar:hover {
  transform: translateY(-2px);
}

.page-about .team-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .team-bar__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--cloud-100);
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold-300);
}

.page-about .team-bar__track {
  height: 12px;
  border-radius: var(--radius-pill);
  background: rgba(233, 240, 252, 0.07);
  border: 1px solid rgba(147, 166, 192, 0.18);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--ink-700), var(--gold-500));
  transition: filter 180ms var(--ease);
}

.page-about .team-bar:hover .team-bar__fill {
  filter: brightness(1.18);
}

.page-about .team-bar__desc {
  margin: 10px 0 0;
  max-width: 56ch;
  font-family: var(--about-serif);
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist-300);
}

/* ---------- 资质 ---------- */
.page-about .cert-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

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

@media (min-width: 1240px) {
  .page-about .cert-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .cert {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-line);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .cert:hover,
.page-about .cert:focus-within {
  transform: translateY(-4px);
  border-color: var(--gold-300);
  box-shadow: var(--shadow-lift);
}

.page-about .cert__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--cloud-100);
}

.page-about .cert__meta {
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist-300);
}

.page-about .cert__dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--jade-500);
  margin-right: 6px;
  vertical-align: 1px;
  box-shadow: 0 0 0 3px rgba(47, 178, 131, 0.16);
}

.page-about .cert__state {
  color: var(--jade-500);
}

/* ---------- 服务网络时间轴 ---------- */
.page-about .net-track {
  --node-w: 200px;
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 16px;
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .net-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .net-track::-webkit-scrollbar-track {
  background: rgba(233, 240, 252, 0.06);
  border-radius: var(--radius-pill);
}

.page-about .net-track::-webkit-scrollbar-thumb {
  background: rgba(200, 135, 60, 0.5);
  border-radius: var(--radius-pill);
}

.page-about .net-track__item {
  position: relative;
  flex: 0 0 var(--node-w);
  padding-right: 20px;
  scroll-snap-align: start;
}

.page-about .net-track__year {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
}

.page-about .net-track__node {
  position: relative;
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold-500);
  margin: 14px 0 14px;
}

.page-about .net-track__node::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 50%;
  width: calc(var(--node-w) - 10px);
  height: 1px;
  background: linear-gradient(90deg, rgba(200, 135, 60, 0.5), rgba(200, 135, 60, 0.08));
  transform: translateY(-50%);
}

.page-about .net-track__item:last-child .net-track__node::after {
  display: none;
}

.page-about .net-track__item[data-hub] .net-track__node {
  background: var(--jade-500);
  box-shadow: 0 0 0 4px rgba(47, 178, 131, 0.16);
}

.page-about .net-track__city {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--cloud-100);
}

.page-about .net-track__note {
  margin: 6px 0 0;
  max-width: 170px;
  font-family: var(--about-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

@media (max-width: 520px) {
  .page-about .net-track {
    --node-w: 172px;
  }
}

/* ---------- 重点枢纽 ---------- */
.page-about .hub-pair {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 760px) {
  .page-about .hub-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .hub-card {
  padding: 22px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-line);
  background: linear-gradient(150deg, rgba(21, 53, 92, 0.85), rgba(13, 35, 64, 0.7));
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .hub-card:hover {
  transform: translateY(-4px);
  border-color: var(--gold-300);
}

.page-about .hub-card .eyebrow {
  margin: 0;
  color: var(--gold-300);
}

.page-about .hub-card__text {
  margin: 12px 0 0;
  max-width: 46ch;
  font-family: var(--about-serif);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--cloud-100);
}

/* ---------- 做事方式 ---------- */
.page-about .way-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: rgba(227, 182, 120, 0.14);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .way-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 22px;
  background: rgba(8, 24, 43, 0.86);
  transition: background 180ms var(--ease);
}

.page-about .way-item:hover {
  background: rgba(13, 35, 64, 0.94);
}

.page-about .way-item__num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--gold-500);
  padding-top: 2px;
}

.page-about .way-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--cloud-100);
}

.page-about .way-item__body p {
  margin: 8px 0 0;
  max-width: 56ch;
  font-family: var(--about-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist-300);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(8px, 2vw, 20px);
  padding: clamp(28px, 4.2vw, 50px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-line);
  background: linear-gradient(142deg, var(--ink-800), var(--ink-700) 130%);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--cloud-100);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 58ch;
  font-family: var(--about-serif);
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-300);
}

.page-about .about-cta__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__note {
  margin: 22px 0 0;
  font-family: var(--about-serif);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist-300);
}

.page-about .about-cta__note a {
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(227, 182, 120, 0.5);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-cta__note a:hover,
.page-about .about-cta__note a:focus-visible {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .about-open__title {
    font-size: clamp(28px, 8.6vw, 40px);
  }

  .page-about .about-open__meta {
    gap: 6px 16px;
    font-size: 11.5px;
  }

  .page-about .way-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    padding: 18px 16px;
  }

  .page-about .about-index__item {
    padding: 14px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cert,
  .page-about .team-bar,
  .page-about .hub-card,
  .page-about .way-item,
  .page-about .about-rail__link::before {
    transition: none;
  }

  .page-about .cert:hover,
  .page-about .team-bar:hover,
  .page-about .hub-card:hover {
    transform: none;
  }
}