.page-about {
  --about-rail: minmax(180px, 258px);
  --about-note: minmax(140px, 188px);
  background-color: var(--space);
  color: var(--snow);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 54px) 0 clamp(48px, 8vw, 104px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  left: -12%;
  width: 74%;
  height: 130%;
  background: radial-gradient(closest-side, rgba(18, 161, 80, 0.34), rgba(18, 161, 80, 0) 72%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong) 12%, var(--line-strong) 88%, transparent);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(240px, 0.85fr);
    align-items: end;
    gap: clamp(36px, 6vw, 88px);
  }
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(34px, 6.6vw, 64px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.035em;
}

.page-about .about-hero__title .tilt {
  display: inline-block;
  transform: skewX(-6deg);
  color: var(--flag);
  text-shadow: 0 0 44px rgba(232, 255, 58, 0.2);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: var(--fs-lead);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-hero__meta {
  margin: 20px 0 0;
  font-size: var(--fs-note);
  letter-spacing: 0.1em;
  color: var(--cold);
}

.page-about .hero-figure {
  border: var(--rule) solid var(--line-strong);
  border-top: 2px solid var(--pitch);
  background: linear-gradient(155deg, rgba(16, 26, 46, 0.94), rgba(7, 12, 20, 0.94));
  box-shadow: inset 0 1px 0 rgba(242, 246, 250, 0.06), 0 20px 44px -30px rgba(0, 0, 0, 0.95);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .hero-figure__num {
  display: block;
  font-size: clamp(56px, 10vw, 88px);
  line-height: 0.88;
  letter-spacing: -0.05em;
  color: var(--flag);
}

.page-about .hero-figure__label {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-body);
  font-weight: 700;
  color: var(--snow);
}

.page-about .hero-figure__desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cold);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(56px, 8vw, 112px) 0;
}

.page-about .chapter + .chapter {
  border-top: var(--rule) solid var(--line);
}

.page-about .chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

@media (min-width: 900px) {
  .page-about .chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr) var(--about-note);
    gap: clamp(32px, 4.5vw, 68px);
    align-items: start;
  }
}

.page-about .chapter__aside,
.page-about .chapter__main,
.page-about .chapter__note {
  min-width: 0;
}

.page-about .chapter__index {
  display: block;
  font-size: clamp(46px, 8vw, 76px);
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: rgba(18, 161, 80, 0.5);
}

.page-about .chapter__title {
  margin: 14px 0 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
  color: var(--snow);
}

.page-about .chapter__main > p {
  max-width: 66ch;
  margin: 0 0 18px;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--mute);
}

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

.page-about .chapter__main a {
  color: var(--flag);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .chapter__note {
  padding-left: 16px;
  border-left: var(--rule) solid var(--line-strong);
}

.page-about .note-anchor {
  display: block;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--flag);
}

.page-about .chapter__note p {
  margin: 12px 0 0;
  font-size: var(--fs-note);
  line-height: 1.7;
  color: var(--cold);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  margin-top: clamp(36px, 5vw, 62px);
  padding: clamp(24px, 3.6vw, 38px) clamp(18px, 3vw, 32px);
  border: var(--rule) solid var(--line);
  border-left: 2px solid var(--pitch);
  background: linear-gradient(180deg, rgba(10, 90, 44, 0.42), rgba(7, 12, 20, 0.08));
}

.page-about .timeline__heading {
  margin: 0 0 24px;
  font-size: var(--fs-note);
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--moss);
}

.page-about .timeline__track {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 900px) {
  .page-about .timeline__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .timeline__track::before {
    content: "";
    position: absolute;
    top: 5px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--flag), rgba(232, 255, 58, 0.16));
  }
}

.page-about .timeline__node {
  position: relative;
  padding-top: 22px;
}

.page-about .timeline__flag {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 11px solid var(--flag);
  transition: transform 0.3s var(--ease);
}

.page-about .timeline__stage {
  display: block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--flag);
}

.page-about .timeline__label {
  display: block;
  margin-top: 7px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--snow);
}

.page-about .timeline__tip {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--cold);
  transition: color 0.3s var(--ease);
}

.page-about .timeline__node:hover .timeline__tip,
.page-about .timeline__node:focus-within .timeline__tip {
  color: var(--mute);
}

.page-about .timeline__node:hover .timeline__flag,
.page-about .timeline__node:focus-within .timeline__flag {
  transform: translateX(4px);
}

/* ---------- 归档区块 ---------- */
.page-about .archive-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(36px, 5vw, 58px);
  align-items: center;
}

@media (min-width: 760px) {
  .page-about .archive-block {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  }
}

.page-about .archive-block .media-frame {
  margin: 0;
}

.page-about .archive-block__kicker {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .archive-block__text p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.85;
  color: var(--mute);
}

/* ---------- 12 项统计 ---------- */
.page-about .metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  background-color: var(--line);
  border: var(--rule) solid var(--line);
}

.page-about .metric-item {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 13px 14px;
  background-color: var(--space);
  font-size: 15px;
  color: var(--snow);
}

.page-about .metric-item:nth-child(4n + 1) {
  background-color: rgba(18, 161, 80, 0.1);
}

.page-about .metric-item__no {
  font-size: 11.5px;
  color: var(--cold);
}

/* ---------- 三种角色 ---------- */
.page-about .role-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .role-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .role-card {
  border: var(--rule) solid var(--line);
  border-top: 2px solid var(--pitch);
  background: linear-gradient(180deg, rgba(16, 26, 46, 0.88), rgba(7, 12, 20, 0.55));
  box-shadow: inset 0 1px 0 rgba(242, 246, 250, 0.05);
  padding: 20px 18px 22px;
}

.page-about .role-card:nth-child(2) {
  border-top-color: var(--flag);
}

.page-about .role-card:nth-child(3) {
  border-top-color: var(--moss);
}

.page-about .role-card__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--snow);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 合作方数字 ---------- */
.page-about .partner-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background-color: var(--line);
  border: var(--rule) solid var(--line);
}

@media (min-width: 760px) {
  .page-about .partner-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner-stats li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 20px 22px;
  background-color: var(--panel);
}

.page-about .partner-stats li:nth-child(3) {
  background: linear-gradient(140deg, rgba(18, 161, 80, 0.24), var(--panel));
}

.page-about .partner-stats__num {
  font-size: clamp(34px, 4.6vw, 48px);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--flag);
  flex: none;
}

.page-about .partner-stats__label {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 章节配图 ---------- */
.page-about .chapter__media {
  margin: clamp(30px, 4.5vw, 54px) 0 0;
}

.page-about .chapter__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding: clamp(52px, 7vw, 96px) 0 clamp(64px, 9vw, 120px);
  border-top: var(--rule) solid var(--line);
  background:
    radial-gradient(120% 140% at 92% 0%, rgba(18, 161, 80, 0.24), rgba(18, 161, 80, 0) 62%),
    linear-gradient(180deg, rgba(10, 90, 44, 0.26), rgba(7, 12, 20, 0));
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 44px);
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: center;
  }
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-cta__copy a {
  color: var(--flag);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

@media (max-width: 480px) {
  .page-about .about-cta__actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }
}