.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  overflow-x: clip;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.08;
  text-wrap: balance;
}

.page-about p {
  margin: 0;
}

.page-about ul,
.page-about ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.page-about .num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.page-about .lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--silver);
  max-width: 62ch;
}

/* 顶部面包屑 */
.page-about .ab-top {
  padding-top: calc(var(--header-h) + 18px);
}

.page-about .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .crumb-list li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line-strong);
}

.page-about .crumb-link {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .crumb-link:hover {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .crumb-list [aria-current="page"] {
  color: var(--lime);
}

/* 统一区块标题组 */
.page-about .ab-head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .ab-head h2 {
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.04;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--silver);
  font-weight: 600;
}

.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--lime);
  border-radius: 2px;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding: clamp(28px, 5vw, 54px) 0 clamp(48px, 7vw, 88px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(760px, 88vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 55% 45%, rgba(47, 243, 208, .16), rgba(182, 255, 59, .05) 45%, transparent 68%);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .ab-hero-copy {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .ab-hero h1 {
  font-size: clamp(33px, 6.2vw, 68px);
  line-height: 1.02;
  letter-spacing: -.03em;
}

.page-about .ab-hl {
  color: var(--lime);
  position: relative;
  white-space: nowrap;
}

.page-about .ab-hero-lead {
  max-width: 56ch;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  margin-top: 6px;
}

.page-about .ab-stat {
  background: var(--ink-2);
  padding: 16px 14px;
}

.page-about .ab-stat .num {
  display: block;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  color: var(--lime);
  line-height: 1;
}

.page-about .ab-unit {
  font-size: .52em;
  margin-left: 2px;
  color: var(--cyan);
}

.page-about .ab-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--silver);
  line-height: 1.5;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-about .ab-hero-art {
  min-width: 0;
}

.page-about .ab-hero-figure {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--ink-2), rgba(47, 243, 208, .12));
}

.page-about .ab-hero-figure img {
  width: 100%;
  object-fit: cover;
}

/* 三条路径 */
.page-about .ab-map {
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ab-rail-label {
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .ab-map-rail p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .ab-paths {
  display: grid;
  gap: 14px;
}

.page-about .ab-path {
  position: relative;
  padding: 26px 20px 22px;
  border-radius: var(--r-lg);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}

.page-about .ab-path::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  background: var(--cyan);
}

.page-about .ab-path--lime::before { background: var(--lime); }
.page-about .ab-path--flame::before { background: var(--flame); }

.page-about .ab-path:hover,
.page-about .ab-path:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 22px 44px -26px rgba(47, 243, 208, .55);
}

.page-about .ab-path-num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .ab-path--lime .ab-path-num { color: var(--lime); }
.page-about .ab-path--flame .ab-path-num { color: var(--flame); }

.page-about .ab-path h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.page-about .ab-path p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .ab-path-key {
  display: inline-block;
  margin-top: 14px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .ab-join {
  height: 52px;
  margin: 6px 0 -6px;
  color: var(--line-strong);
  display: none;
}

.page-about .ab-join svg {
  width: 100%;
  height: 100%;
  display: block;
}

.page-about .ab-hub {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 20px 22px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(182, 255, 59, .42);
  background: linear-gradient(115deg, rgba(182, 255, 59, .14), rgba(47, 243, 208, .07) 60%, transparent);
}

.page-about .ab-hub p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  flex: 1 1 240px;
}

/* 里程碑 */
.page-about .ab-track-section {
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-banner {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  margin-bottom: clamp(26px, 4vw, 44px);
  background: linear-gradient(120deg, var(--ink-2), rgba(255, 90, 42, .14));
}

.page-about .ab-banner img {
  width: 100%;
  object-fit: cover;
}

.page-about .ab-year-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-year-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  color: var(--silver);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .25s var(--ease), color .25s var(--ease), background .25s var(--ease);
}

.page-about .ab-year-list a .num {
  color: var(--cyan);
  font-size: 13px;
}

.page-about .ab-year-list a:hover,
.page-about .ab-year-list a:focus-visible {
  border-color: var(--lime);
  color: var(--paper);
  background: rgba(182, 255, 59, .08);
}

.page-about .ab-track-list {
  display: grid;
  gap: 0;
}

.page-about .ab-ms {
  position: relative;
  padding: 20px 0 24px 24px;
  border-left: 2px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-color .3s var(--ease);
}

.page-about .ab-ms::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line-strong);
  transition: background .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-ms-year {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .ab-ms h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.page-about .ab-ms p:not(.ab-ms-year) {
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
  max-width: 60ch;
}

.page-about .ab-ms:target {
  border-left-color: var(--lime);
  background: linear-gradient(90deg, rgba(182, 255, 59, .09), transparent 70%);
}

.page-about .ab-ms:target::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 5px rgba(182, 255, 59, .2);
}

.page-about .ab-ms:target h3 {
  color: var(--lime);
}

/* 运营体系 */
.page-about .ab-ops {
  padding: clamp(44px, 6vw, 80px) 0;
  background: var(--ink-3);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-ops-figures {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-figure {
  background: var(--ink-2);
  padding: 18px;
}

.page-about .ab-figure .num {
  font-size: clamp(26px, 4vw, 32px);
  font-weight: 700;
  color: var(--lime);
  line-height: 1;
}

.page-about .ab-figure-label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .ab-figure p {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.68;
  color: var(--silver);
}

.page-about .ab-ops-main {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.page-about .ab-ops-figure {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--graphite), var(--ink-2));
}

.page-about .ab-ops-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .ab-steps {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ab-steps li {
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .ab-step-num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--flame);
  margin-bottom: 10px;
}

.page-about .ab-steps h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.page-about .ab-steps p {
  font-size: 13px;
  line-height: 1.68;
  color: var(--silver);
}

/* 内容栏目（浅色阅读区） */
.page-about .ab-columns {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(44px, 6vw, 82px) 0;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}

.page-about .ab-columns .eyebrow {
  color: #4A5B54;
}

.page-about .ab-columns .eyebrow::before {
  background: var(--flame);
}

.page-about .ab-columns .lead {
  color: #384A43;
}

.page-about .ab-col-list {
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(7, 28, 22, .16);
}

.page-about .ab-col-list li {
  padding: 22px 16px 24px 0;
  border-bottom: 1px solid rgba(7, 28, 22, .16);
}

.page-about .ab-col-num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: #C23A12;
  margin-bottom: 10px;
}

.page-about .ab-col-list h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--ink);
}

.page-about .ab-col-list p {
  font-size: 14px;
  line-height: 1.75;
  color: #3C4E47;
}

.page-about .ab-col-actions {
  margin-top: clamp(22px, 3vw, 32px);
}

/* 合作生态 */
.page-about .ab-partners {
  padding: clamp(44px, 6vw, 82px) 0;
  background: linear-gradient(105deg, var(--ink-2) 0%, var(--ink) 52%, rgba(255, 90, 42, .16) 100%);
}

.page-about .ab-partner-nums {
  display: grid;
  gap: 1px;
  background: var(--line-strong);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .ab-partner-nums li {
  background: var(--ink-2);
  padding: 22px 20px;
}

.page-about .ab-partner-nums .num {
  display: block;
  font-size: clamp(32px, 5.2vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--flame);
}

.page-about .ab-partner-nums span:last-child {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .ab-coop {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(22px, 3vw, 30px);
}

.page-about .ab-coop li {
  padding: 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(14, 43, 34, .72);
}

.page-about .ab-coop p {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--silver);
}

/* 中文导航服务角色 */
.page-about .ab-navrole {
  padding: clamp(44px, 6vw, 82px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-navrole-grid {
  display: grid;
  gap: 30px;
  align-items: center;
}

.page-about .ab-navrole-copy {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .ab-navrole-copy h2 {
  font-size: clamp(26px, 4.2vw, 44px);
}

.page-about .ab-navrole-copy p:not(.eyebrow):not(.lead) {
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
  max-width: 60ch;
}

.page-about .ab-navrole-actions {
  margin-top: 6px;
}

.page-about .ab-clock-wrap {
  padding: 26px 22px 24px;
  border-radius: var(--r-lg);
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .ab-clock-label {
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 24px;
}

.page-about .ab-clock {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
}

.page-about .ab-clock::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 8.333%;
  right: 8.333%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--lime) 48%, var(--flame));
  opacity: .65;
}

.page-about .ab-clock li {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.page-about .ab-dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 2px solid var(--cyan);
  position: relative;
}

.page-about .ab-clock li:nth-child(3) .ab-dot {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-clock li:nth-child(6) .ab-dot {
  background: var(--flame);
  border-color: var(--flame);
}

.page-about .ab-clock em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

.page-about .ab-clock-note {
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

/* 收尾 */
.page-about .ab-next {
  padding: clamp(36px, 5vw, 60px) 0 clamp(48px, 7vw, 84px);
  border-top: 1px solid var(--line);
}

.page-about .ab-next-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
}

.page-about .ab-next h2 {
  font-size: clamp(22px, 3vw, 30px);
}

.page-about .ab-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 响应式 */
@media (min-width: 560px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .ab-paths {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-col-list li {
    padding-right: 24px;
  }

  .page-about .ab-partner-nums {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: center;
    gap: 52px;
  }

  .page-about .ab-rail {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .ab-track-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }

  .page-about .ab-year-list {
    flex-direction: column;
    overflow: visible;
    align-items: flex-start;
    padding-bottom: 0;
  }

  .page-about .ab-ms {
    padding-left: 30px;
  }

  .page-about .ab-join {
    display: block;
  }

  .page-about .ab-navrole-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 56px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-col-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .ab-path:hover,
  .page-about .ab-path:focus-within {
    transform: none;
  }
}