.page-about {
  --about-pad: 20px;
  --about-r: 18px;
  display: block;
  color: var(--ng-cream);
}

/* ---------- 面包屑间距 ---------- */
.page-about .crumb {
  padding: 18px 0 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 16px 0 44px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -6% -8% auto -8%;
  height: 78%;
  background:
    radial-gradient(58% 68% at 72% 18%, rgba(217, 164, 65, 0.15), transparent 70%),
    radial-gradient(52% 62% at 12% 8%, rgba(193, 59, 46, 0.13), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  align-items: center;
}

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

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--ng-font-head);
  font-weight: 900;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ng-cream);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ng-mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  padding: 12px 14px;
  border-radius: var(--ng-r-sm);
  border-left: 3px solid var(--ng-gold);
  background: var(--ng-surface);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--ng-font-mono);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ng-gold-2);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ng-mist);
}

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

.page-about .about-hero__media {
  position: relative;
  overflow: hidden;
  border-radius: var(--ng-r-lg);
  border: 1px solid var(--ng-line);
  background: linear-gradient(158deg, var(--ng-ink-2), var(--ng-ink) 72%);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(217, 164, 65, 0.14), transparent 46%);
  pointer-events: none;
}

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

/* ---------- 章节锚点条 ---------- */
.page-about .anchor-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 10px;
  scrollbar-width: thin;
}

.page-about .anchor-rail__link {
  position: relative;
  flex: 0 0 auto;
  padding: 8px 15px;
  border-radius: 999px;
  border: 1px solid var(--ng-line-soft);
  font-size: 13px;
  line-height: 1.4;
  color: var(--ng-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ng-t) var(--ng-ease), border-color var(--ng-t) var(--ng-ease),
    background-color var(--ng-t) var(--ng-ease);
}

.page-about .anchor-rail__link:hover,
.page-about .anchor-rail__link:focus-visible {
  color: var(--ng-gold-2);
  border-color: var(--ng-gold);
  outline: none;
}

.page-about .anchor-rail__link.is-active {
  color: var(--ng-cream);
  border-color: var(--ng-red);
  background: rgba(193, 59, 46, 0.22);
}

.page-about .anchor-rail__link.is-active::before {
  content: "";
  position: absolute;
  top: 6px;
  right: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ng-gold);
}

/* ---------- 通用 section ---------- */
.page-about .about-section {
  padding: 50px 0 6px;
  scroll-margin-top: 96px;
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-section__no {
  font-family: var(--ng-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ng-gold);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--ng-font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ng-cream);
}

.page-about .about-section__intro {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ng-mist);
}

/* ---------- 01 主张 ---------- */
.page-about .idea-split {
  display: grid;
  gap: 22px;
}

.page-about .idea-split__main p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ng-cream);
}

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

.page-about .idea-notes {
  margin: 0;
  padding: 20px;
  list-style: none;
  display: grid;
  gap: 18px;
  border-radius: var(--ng-r);
  border: 1px solid var(--ng-line);
  background: var(--ng-surface);
}

.page-about .idea-notes__item {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 12px;
  align-items: start;
}

.page-about .idea-notes__dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border-radius: 50%;
  display: block;
}

.page-about .idea-notes__dot--red {
  background: var(--ng-red);
}

.page-about .idea-notes__dot--gold {
  background: var(--ng-gold);
}

.page-about .idea-notes__dot--green {
  background: var(--ng-green);
}

.page-about .idea-notes__title {
  margin: 0 0 4px;
  font-family: var(--ng-font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ng-cream);
}

.page-about .idea-notes__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ng-mist);
}

/* ---------- 02 团队 ---------- */
.page-about .role-stack {
  display: grid;
  gap: 16px;
}

.page-about .role-card {
  padding: 20px 20px 22px;
  border-radius: var(--ng-r);
  border: 1px solid var(--ng-line-soft);
  background: var(--ng-surface);
  border-left-width: 3px;
  transition: transform var(--ng-t) var(--ng-ease), border-color var(--ng-t) var(--ng-ease);
}

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

.page-about .role-card--red {
  border-left-color: var(--ng-red);
}

.page-about .role-card--gold {
  border-left-color: var(--ng-gold);
}

.page-about .role-card--green {
  border-left-color: var(--ng-green);
}

.page-about .role-card__index {
  display: inline-block;
  font-family: var(--ng-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ng-gold);
}

.page-about .role-card__title {
  margin: 6px 0 8px;
  font-family: var(--ng-font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--ng-cream);
}

.page-about .role-card__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ng-mist);
}

.page-about .role-tempo {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-radius: var(--ng-r-sm);
  border: 1px dashed var(--ng-line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ng-cream);
  background: rgba(18, 38, 58, 0.45);
}

/* ---------- 03 栏目 ---------- */
.page-about .col-ring {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .col-ring__cell {
  display: grid;
  gap: 3px;
  padding: 13px 12px;
  border-radius: var(--ng-r-md);
  border: 1px solid var(--ng-line-soft);
  background: var(--ng-surface);
  transition: transform var(--ng-t) var(--ng-ease), border-color var(--ng-t) var(--ng-ease);
}

.page-about .col-ring__cell:hover {
  transform: translateY(-2px);
  border-color: var(--ng-gold);
}

.page-about .col-ring__cell--anchor {
  border-color: rgba(193, 59, 46, 0.62);
  background: linear-gradient(156deg, rgba(193, 59, 46, 0.18), rgba(18, 38, 58, 0.72));
}

.page-about .col-ring__no {
  font-family: var(--ng-font-mono);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ng-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .col-ring__cell--anchor .col-ring__no {
  color: var(--ng-gold-2);
}

.page-about .col-ring__name {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ng-cream);
}

.page-about .col-note {
  margin-top: 22px;
  padding: 18px 20px;
  border-radius: var(--ng-r);
  border: 1px solid var(--ng-line);
  background: rgba(18, 38, 58, 0.6);
}

.page-about .col-note p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ng-mist);
}

.page-about .col-note strong {
  color: var(--ng-gold-2);
  font-weight: 700;
}

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

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

/* ---------- 04 共建 ---------- */
.page-about .coop-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  counter-reset: coop;
}

.page-about .coop-flow__step {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--ng-r);
  border: 1px solid var(--ng-line-soft);
  border-top: 3px solid var(--ng-gold);
  background: var(--ng-surface);
  transition: border-color var(--ng-t) var(--ng-ease), transform var(--ng-t) var(--ng-ease);
}

.page-about .coop-flow__step:hover {
  transform: translateY(-2px);
  border-color: var(--ng-line);
}

.page-about .coop-flow__no {
  display: inline-block;
  font-family: var(--ng-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ng-gold);
}

.page-about .coop-flow__title {
  margin: 6px 0 8px;
  font-family: var(--ng-font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--ng-cream);
}

.page-about .coop-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ng-mist);
}

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

.page-about .coop-tail {
  margin: 22px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ng-mist);
  padding-left: 16px;
  border-left: 2px solid var(--ng-green);
}

/* ---------- 05 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 38px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    rgba(193, 59, 46, 0.75),
    rgba(217, 164, 65, 0.7) 50%,
    rgba(111, 169, 138, 0.7)
  );
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 20px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 20px;
  left: -31px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--ng-ink);
  background: var(--ng-gold);
  transition: transform var(--ng-t) var(--ng-ease);
}

.page-about .timeline__item--red::before {
  background: var(--ng-red);
}

.page-about .timeline__item--green::before {
  background: var(--ng-green);
}

.page-about .timeline__item:hover::before {
  transform: scale(1.28);
}

.page-about .timeline__card {
  padding: 18px 18px 20px;
  border-radius: var(--ng-r);
  border: 1px solid var(--ng-line-soft);
  background: var(--ng-surface);
  transition: border-color var(--ng-t) var(--ng-ease);
}

.page-about .timeline__item:hover .timeline__card {
  border-color: var(--ng-line);
}

.page-about .timeline__phase {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ng-ink);
  background: var(--ng-gold-2);
}

.page-about .timeline__item--red .timeline__phase {
  color: var(--ng-cream);
  background: var(--ng-red);
}

.page-about .timeline__item--green .timeline__phase {
  color: var(--ng-ink);
  background: var(--ng-green);
}

.page-about .timeline__title {
  margin: 10px 0 8px;
  font-family: var(--ng-font-head);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ng-cream);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ng-mist);
}

.page-about .timeline__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ng-mist);
  transition: max-height var(--ng-t) var(--ng-ease), opacity var(--ng-t) var(--ng-ease),
    margin-top var(--ng-t) var(--ng-ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--ng-line-soft);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: 48px 0 8px;
}

.page-about .about-cta__panel {
  padding: 28px 22px 30px;
  border-radius: var(--ng-r-lg);
  border: 1px solid var(--ng-line);
  background: linear-gradient(152deg, rgba(193, 59, 46, 0.2), rgba(18, 38, 58, 0.82) 62%);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--ng-font-head);
  font-size: clamp(20px, 3.2vw, 27px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ng-cream);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ng-mist);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .role-stack {
    gap: 18px;
  }

  .page-about .role-card:nth-child(2) {
    margin-left: 30px;
  }

  .page-about .role-card:nth-child(3) {
    margin-left: 60px;
  }

  .page-about .col-ring {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

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

  .page-about .about-cta__panel {
    padding: 36px 34px 38px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 26px 0 60px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: 46px;
  }

  .page-about .idea-split {
    grid-template-columns: 1.35fr 1fr;
    gap: 30px;
    align-items: start;
  }

  .page-about .about-section {
    padding-top: 62px;
  }

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

  .page-about .col-ring {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  /* 时间轴左右交替 */
  .page-about .timeline {
    padding-left: 0;
    display: block;
  }

  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .timeline__item {
    width: calc(50% - 40px);
    margin-bottom: 24px;
  }

  .page-about .timeline__item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .timeline__item:nth-child(odd)::before {
    left: auto;
    right: -46px;
  }

  .page-about .timeline__item:nth-child(even)::before {
    left: -46px;
    right: auto;
  }

  .page-about .timeline__more {
    max-height: 0;
  }
}

@media (min-width: 1180px) {
  .page-about .col-ring__cell {
    padding: 15px 14px;
  }

  .page-about .col-ring__no {
    font-size: 19px;
  }
}

/* 窄屏时间轴：补充说明直接展开，避免依赖悬停 */
@media (max-width: 899px) {
  .page-about .timeline__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--ng-line-soft);
  }
}

/* 小屏微调，防止横向溢出 */
@media (max-width: 420px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }

  .page-about .col-ring {
    grid-template-columns: 1fr;
  }

  .page-about .role-card:nth-child(2),
  .page-about .role-card:nth-child(3) {
    margin-left: 0;
  }
}

.page-about {
  --ng-r: 10px;
}