.page-about {
  --about-rail: 220px;
  --about-shell-gap: clamp(18px, 4vw, 40px);
  padding-top: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 20px 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.page-about .breadcrumb a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

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

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line-steel);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 10px;
  overflow: hidden;
}

.page-about .about-hero__glow {
  position: absolute;
  top: -160px;
  right: -120px;
  width: min(560px, 96vw);
  height: min(560px, 96vw);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(53, 230, 210, .16), rgba(53, 230, 210, 0) 64%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 9vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-2);
}

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

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: var(--radius-cut);
  border: 1px solid var(--line-steel);
}

.page-about .about-hero__figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

/* 统计带 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-steel);
  border-top: 1px solid var(--line-steel);
  border-bottom: 1px solid var(--line-steel);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: var(--ink-950);
}

.page-about .about-stats__value {
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stats__label {
  font-size: 13px;
  color: var(--text-3);
}

/* ---------- 通用分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-split__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-split__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5.2vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
}

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

.page-about .about-lead {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-split__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-2);
}

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

.page-about .about-split__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 210, .4);
}

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

/* ---------- 时间轴装饰 ---------- */
.page-about .about-timeline {
  display: block;
  width: 100%;
  height: 46px;
  margin-bottom: 12px;
  opacity: .9;
}

/* ---------- 发展阶段 ---------- */
.page-about .phase-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: phase;
}

.page-about .phase {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0 22px 0;
  border-top: 1px solid var(--line-steel);
}

.page-about .phase:last-child {
  border-bottom: 1px solid var(--line-steel);
}

.page-about .phase::before {
  content: "";
  position: absolute;
  left: 44px;
  top: -1px;
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--amber), rgba(240, 180, 41, 0));
  transform: rotate(-8deg);
  transform-origin: left center;
}

.page-about .phase__num {
  font-size: 26px;
  line-height: 1.1;
  color: var(--amber);
  transition: color .25s ease;
}

.page-about .phase:hover .phase__num {
  color: var(--cyan);
}

.page-about .phase__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .phase__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .phase__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  opacity: .78;
  transition: opacity .25s ease;
}

.page-about .phase:hover .phase__tags,
.page-about .phase:focus-within .phase__tags {
  opacity: 1;
}

/* ---------- 焕新版对照 ---------- */
.page-about .fresh-grid {
  display: grid;
  gap: 16px;
  margin: 26px 0;
}

.page-about .fresh-panel {
  position: relative;
  padding: 22px 20px;
  background: var(--ink-900);
  border: 1px solid var(--line-steel);
  clip-path: var(--radius-cut);
  transition: transform .22s ease, border-color .22s ease;
}

.page-about .fresh-panel:hover {
  transform: translateY(-2px);
}

.page-about .fresh-panel--old {
  border-color: rgba(154, 176, 198, .28);
}

.page-about .fresh-panel--new {
  border-color: rgba(53, 230, 210, .38);
  background: linear-gradient(160deg, rgba(53, 230, 210, .07), rgba(11, 20, 32, 0) 62%), var(--ink-900);
}

.page-about .fresh-panel__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-3);
}

.page-about .fresh-panel--new .fresh-panel__tag {
  color: var(--cyan);
}

.page-about .fresh-panel__title {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .fresh-panel__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-2);
}

.page-about .fresh-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-steel);
}

.page-about .fresh-panel__list li {
  position: relative;
  padding: 9px 0 9px 18px;
  font-size: 14px;
  color: var(--text-2);
  border-bottom: 1px solid rgba(30, 51, 71, .7);
}

.page-about .fresh-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 8px;
  height: 2px;
  background: var(--amber);
}

.page-about .fresh-divider {
  display: block;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--rose), var(--rose-deep));
}

.page-about .fresh-figure {
  margin: 24px 0 20px;
}

.page-about .fresh-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-steel);
  clip-path: var(--radius-cut);
}

.page-about .fresh-figure__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.page-about .fresh-note {
  margin: 0;
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
  background: var(--ink-800);
  border-left: 3px solid var(--rose);
}

/* ---------- 六大栏目 ---------- */
.page-about .cat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cat-card {
  position: relative;
  padding: 20px 18px;
  background: var(--ink-900);
  border: 1px solid var(--line-steel);
  transition: transform .22s ease, border-color .22s ease;
}

.page-about .cat-card:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
}

.page-about .cat-card__num {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .cat-card__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  color: var(--text);
}

.page-about .cat-card__text {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-2);
}

.page-about .cat-card__who {
  margin: 0;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  border-top: 1px solid var(--line-steel);
}

.page-about .cats-foot {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px;
  background: var(--ink-900);
  border: 1px solid var(--line-steel);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .team-card__num {
  margin: 0;
  font-size: 30px;
  line-height: 1;
  color: var(--amber);
}

.page-about .team-card__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--text);
}

.page-about .team-card__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--text-2);
}

.page-about .team-card__meta {
  margin: 0;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-3);
  border-top: 1px solid var(--line-steel);
}

/* ---------- 合作与认可 ---------- */
.page-about .eco {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-steel);
  clip-path: var(--radius-cut);
  background: var(--ink-900);
}

.page-about .eco__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .28;
}

.page-about .eco__body {
  position: relative;
  padding: 30px 20px;
}

.page-about .eco__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.14;
  color: var(--text);
}

.page-about .eco__text {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .eco__stats {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__stats li {
  padding: 14px 0 0;
  border-top: 1px solid rgba(53, 230, 210, .32);
}

.page-about .eco__value {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .eco__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-3);
}

/* ---------- 我们在意的事情 ---------- */
.page-about .pledge-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .pledge {
  padding: 20px 0 0;
  border-top: 2px solid var(--line-steel);
}

.page-about .pledge__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .pledge__mark {
  font-size: 14px;
  color: var(--rose);
}

.page-about .pledge__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-bottom: 60px;
}

.page-about .about-cta__inner {
  padding: 30px 20px;
  background: linear-gradient(150deg, rgba(240, 180, 41, .10), rgba(6, 11, 20, 0) 58%), var(--ink-900);
  border: 1px solid var(--line-steel);
  clip-path: var(--radius-cut);
}

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

.page-about .about-cta__title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.14;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-cta__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 210, .4);
}

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

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

/* ---------- 媒体查询 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .84fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-hero__media {
    margin-top: 12px;
  }

  .page-about .about-stats__item {
    padding: 22px 20px;
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-split__index {
    font-size: 48px;
  }

  .page-about .about-split__rail {
    position: sticky;
    top: calc(var(--entry-h) + 24px);
  }

  .page-about .phase {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 22px;
    padding: 26px 0;
  }

  .page-about .phase__num {
    font-size: 30px;
  }

  .page-about .phase::before {
    left: 58px;
    width: 34px;
  }

  .page-about .fresh-grid {
    grid-template-columns: minmax(0, 1fr) 4px minmax(0, 1fr);
    gap: 22px;
    align-items: stretch;
  }

  .page-about .fresh-divider {
    height: auto;
    border-radius: 0;
    background: linear-gradient(180deg, var(--rose), var(--rose-deep));
  }

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

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 20px;
  }

  .page-about .team-card--tall {
    margin-top: 0;
    padding-bottom: 46px;
  }

  .page-about .team-card--short {
    margin-top: 34px;
  }

  .page-about .eco__body {
    padding: 48px 44px;
  }

  .page-about .pledge-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-cta__inner {
    padding: 52px 48px;
  }

  .page-about .about-cta {
    padding-bottom: 90px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .fresh-panel,
  .page-about .cat-card {
    transition: none;
  }
}