.page-about {
  --about-rail-w: 216px;
  --about-soft: rgba(242, 237, 228, 0.74);
}

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

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(40px, 7vw, 92px) clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  background-image:
    radial-gradient(120% 90% at 8% 0%, rgba(52, 224, 208, 0.09), transparent 62%),
    radial-gradient(90% 80% at 96% 100%, rgba(255, 122, 26, 0.07), transparent 60%);
  background-repeat: no-repeat;
}

.page-about .about-hero .eyebrow {
  display: block;
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-sans);
  font-size: clamp(30px, 5.6vw, 52px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-mineral);
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
  background: var(--c-void);
}

.page-about .about-fact__val {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-neon);
}

.page-about .about-fact:nth-child(2) .about-fact__val {
  color: var(--c-hot);
}

.page-about .about-fact:nth-child(3) .about-fact__val {
  color: var(--c-halo);
}

.page-about .about-fact:nth-child(4) .about-fact__val {
  color: var(--c-clay);
}

.page-about .about-fact__key {
  font-size: 12px;
  line-height: 1.55;
  letter-spacing: 0.08em;
  color: var(--c-cool);
}

/* 左栏章节导航 + 右栏正文 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-block: clamp(34px, 6vw, 74px);
}

.page-about .about-rail {
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: var(--c-panel);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-cool);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  color: var(--c-mineral);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--line-neon);
  color: var(--c-neon);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-neon);
}

.page-about .about-rail__name {
  font-size: 13px;
}

.page-about .about-rail__note {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-cool);
}

.page-about .about-body {
  display: grid;
  gap: clamp(40px, 6vw, 84px);
  min-width: 0;
}

/* 章节通用 */
.page-about .about-section {
  min-width: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-mineral);
}

.page-about .about-lede {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-mineral);
}

.page-about .about-text p {
  margin: 0 0 16px;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

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

.page-about .about-text a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-neon);
}

.page-about .about-text a:hover {
  color: var(--c-hot);
  border-bottom-color: var(--line-hot);
}

.page-about .about-section--moss {
  padding: clamp(22px, 4vw, 40px) clamp(18px, 3.4vw, 36px);
  border: 1px solid var(--line);
  background: var(--c-moss);
}

/* 阶段轴 */
.page-about .about-stage {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-neon), rgba(52, 224, 208, 0.18) 68%, transparent);
}

.page-about .about-stage__item {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 34px) 30px;
}

.page-about .about-stage__item:last-child {
  padding-bottom: 0;
}

.page-about .about-stage__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--line-neon);
  background: var(--c-moss);
}

.page-about .about-stage__item--now::before {
  border-color: var(--c-neon);
  background: var(--c-neon);
  box-shadow: 0 0 14px rgba(52, 224, 208, 0.55);
}

.page-about .about-stage__no {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-clay);
}

.page-about .about-stage__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-mineral);
}

.page-about .about-stage__desc {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}

/* 团队构成 */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-team-text p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-role {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-role__item {
  padding: 14px 16px;
  border-left: 2px solid transparent;
  background: var(--c-void);
  transition: background-color 200ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-role__item:hover {
  border-left-color: var(--c-neon);
  background: var(--c-panel);
}

.page-about .about-role__name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-mineral);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-cool);
}

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

/* 服务网络 */
.page-about .about-net-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-net {
  padding: 18px 18px 20px;
}

.page-about .about-net h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-mineral);
}

.page-about .about-net p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* 执行标准 */
.page-about .about-std {
  display: grid;
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-std__row {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--c-void);
}

.page-about .about-std__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-hot);
}

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

/* 本地与全国协同 */
.page-about .about-cols-2 {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-cols-2 p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-cols-2 a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-neon);
}

.page-about .about-cols-2 a:hover {
  color: var(--c-hot);
  border-bottom-color: var(--line-hot);
}

/* 相关入口 */
.page-about .about-next {
  padding-block: clamp(30px, 5vw, 58px) clamp(48px, 7vw, 88px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-mineral);
}

.page-about .about-next__list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* 宽屏两栏布局 */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-std__row {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: start;
    gap: 28px;
    padding: 18px 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}