.page-about {
  --cut: 14px;
  --about-card-bg: var(--panel);
  display: block;
  background-color: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

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

.page-about .crumbs [aria-current="page"] {
  color: var(--text);
}

.page-about .crumbs-sep {
  color: var(--green-2);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 30px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 96px;
  height: 3px;
  background: var(--signal);
  transform: skewX(-32deg);
  transform-origin: left bottom;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(30px, 7.4vw, 58px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 14px 0 20px;
  max-width: 15em;
}

.page-about .about-lede {
  margin: 0 0 28px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-hero-stats li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  background-color: var(--panel);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  letter-spacing: 0.02em;
}

.page-about .about-num--sm {
  display: block;
  font-size: 13px;
  color: var(--mint);
  letter-spacing: 0.14em;
  margin-bottom: 8px;
}

.page-about .about-cap {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------- 我们在做什么 ---------- */
.page-about .about-what {
  padding: 48px 0 6px;
}

.page-about .about-what-head h2 {
  font-family: var(--font-head);
  font-size: clamp(23px, 4.8vw, 36px);
  font-weight: 800;
  line-height: 1.28;
  margin: 12px 0 0;
  max-width: 20em;
}

.page-about .about-what-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin-top: 26px;
}

.page-about .about-card {
  position: relative;
  padding: 22px 22px 24px;
  background-color: var(--about-card-bg);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  transition: transform var(--ease), background-color var(--ease);
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--signal) 0%, transparent 62%);
}

.page-about .about-card:hover {
  transform: translateY(-2px);
  background-color: var(--green-2);
}

.page-about .about-card h3 {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 10px;
}

.page-about .about-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-card--lead p {
  color: var(--text);
  opacity: 0.88;
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .about-line {
  padding: 54px 0 8px;
}

.page-about .about-phases {
  position: relative;
  margin-top: 30px;
}

.page-about .about-phase {
  position: relative;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 26px;
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 32px;
  bottom: -26px;
  width: 2px;
  background: linear-gradient(to bottom, var(--line), rgba(36, 80, 67, 0.25));
}

.page-about .about-phase--last::before {
  display: none;
}

.page-about .about-phase-rail {
  position: relative;
  padding-left: 24px;
  padding-top: 16px;
  min-width: 0;
}

.page-about .about-stage {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.14em;
  color: var(--signal);
  word-break: break-word;
}

.page-about .about-node {
  position: absolute;
  left: 3px;
  top: 20px;
  width: 10px;
  height: 10px;
  background-color: var(--signal);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(200, 255, 61, 0.55);
}

.page-about .about-phase-card {
  padding: 20px 20px 22px;
  background: linear-gradient(148deg, var(--green-2) 0%, var(--panel) 46%);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  transition: transform var(--ease);
}

.page-about .about-phase-card:hover {
  transform: translateY(-2px);
}

.page-about .about-phase-card h3 {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about .about-phase-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-phase-media {
  margin: 0 0 26px;
}

.page-about .about-phase-media .media-caption,
.page-about .about-team-media .media-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 数据团队 ---------- */
.page-about .about-team {
  padding: 52px 0 10px;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-team-copy h2 {
  font-family: var(--font-head);
  font-size: clamp(23px, 4.8vw, 36px);
  font-weight: 800;
  line-height: 1.28;
  margin: 12px 0 16px;
  max-width: 18em;
}

.page-about .about-team-p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 46ch;
}

.page-about .tabs {
  margin-top: 24px;
}

.page-about .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .tab {
  appearance: none;
  border: 1px solid var(--line);
  background-color: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  line-height: 1.4;
  padding: 8px 14px;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.page-about .tab:hover {
  color: var(--text);
  border-color: var(--green-2);
}

.page-about .tab.is-active {
  background-color: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  font-weight: 700;
}

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

.page-about .tab-panel {
  padding: 18px 20px;
  border-left: 2px solid var(--mint);
  background-color: rgba(36, 80, 67, 0.22);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

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

/* ---------- 内容体系 ---------- */
.page-about .about-catalog {
  padding: 54px 0 8px;
}

.page-about .about-catalog-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background-color: var(--line);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.page-about .about-catalog-list li {
  position: relative;
  padding: 20px 18px 22px;
  background-color: var(--panel);
  transition: background-color var(--ease);
}

.page-about .about-catalog-list li:hover {
  background-color: var(--green-2);
}

.page-about .about-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
  margin-bottom: 10px;
}

.page-about .about-catalog-list h3 {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .about-catalog-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-series {
  margin-top: 26px;
  padding: 22px 20px 24px;
  border-left: 2px solid var(--mint);
  background-image: repeating-linear-gradient(135deg, rgba(127, 227, 166, 0.055) 0 1px, transparent 1px 11px);
  background-color: rgba(16, 32, 26, 0.75);
}

.page-about .about-series-title {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--mint);
}

.page-about .about-series ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-series li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-series strong {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-series span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: 54px 0 8px;
}

.page-about .about-partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin-top: 26px;
}

.page-about .about-card--stat .about-big {
  display: block;
  font-family: var(--font-mono);
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

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

.page-about .about-partners-cta .btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.page-about .about-partners-cta .btn:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* ---------- 行业认可 ---------- */
.page-about .about-honor {
  padding: 54px 0 8px;
}

.page-about .about-honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin-top: 26px;
}

.page-about .about-honor-card h3 {
  font-size: 17px;
}

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

.page-about .about-legal {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 48px 0 64px;
}

.page-about .about-next-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-next-list a {
  display: block;
  padding: 14px 16px;
  background-color: var(--panel);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  border-left: 2px solid var(--green-2);
  transition: border-color var(--ease), color var(--ease), background-color var(--ease);
}

.page-about .about-next-list a:hover,
.page-about .about-next-list a:focus-visible {
  border-left-color: var(--signal);
  color: var(--signal);
  background-color: var(--green-2);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-card--lead {
    grid-column: 1 / -1;
  }

  .page-about .about-phase {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 22px;
  }

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

  .page-about .about-series ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-card--stat {
    grid-column: 1 / -1;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 44px 0 54px;
  }

  .page-about .about-what-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }

  .page-about .about-card--lead {
    grid-column: auto;
  }

  .page-about .about-phase {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 40px;
    padding-bottom: 34px;
  }

  .page-about .about-phase::before {
    bottom: -34px;
  }

  .page-about .about-phase-card {
    padding: 24px 28px 26px;
    max-width: 74ch;
  }

  .page-about .about-phase:nth-child(even) .about-phase-card {
    max-width: 62ch;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .about-partners-grid {
    grid-template-columns: 1.25fr 1fr 1fr;
  }

  .page-about .about-card--stat {
    grid-column: auto;
  }

  .page-about .about-honor-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-next {
    padding-bottom: 80px;
  }

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

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-phase-card,
  .page-about .about-next-list a,
  .page-about .tab {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-phase-card:hover {
    transform: none;
  }
}