.page-about {
  --about-rail: 6rem;
  --about-flow-gap: clamp(2.4rem, 6vw, 4.6rem);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.1rem, 3vw, 2.2rem);
}

.page-about .about-hero .yj-crumb {
  margin-bottom: clamp(1rem, 3vw, 1.8rem);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(1.5rem, 4.4vw, 3.6rem);
  border: 1px solid var(--yj-line);
  border-radius: var(--yj-r-lg);
  background:
    radial-gradient(130% 150% at 100% 0%, rgba(57, 242, 180, .10), transparent 58%),
    linear-gradient(155deg, rgba(22, 51, 42, .84), rgba(10, 24, 20, .74));
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--yj-mint), var(--yj-volt) 56%, var(--yj-violet));
  opacity: .82;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 14%, #000 86%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 14%, #000 86%, transparent);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: clamp(1rem, 3vw, 2.4rem);
  top: clamp(1rem, 3vw, 2.4rem);
  width: 76px;
  height: 76px;
  border-radius: 50%;
  border: 1px dashed var(--yj-line-mint);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: .75rem 0 1rem;
  font-family: var(--yj-font-squeeze);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.2vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--yj-bone);
  max-width: 18ch;
}

.page-about .about-hero .yj-lede {
  max-width: 48ch;
  margin: 0;
  color: var(--yj-mist);
  font-size: clamp(1rem, 2.4vw, 1.14rem);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.4rem;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px solid var(--yj-line);
}

.page-about .about-hero__facts div {
  min-width: 0;
}

.page-about .about-hero__facts dt {
  font-family: var(--yj-font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--yj-slate);
}

.page-about .about-hero__facts dd {
  margin: .35rem 0 0;
  font-size: .95rem;
  line-height: 1.55;
  color: var(--yj-bone);
}

.page-about .about-hero__media {
  margin-top: clamp(1.6rem, 4vw, 3rem);
}

/* ---------- 媒体容器（页面内统一处理） ---------- */
.page-about .yj-media {
  display: block;
  margin: 0;
}

.page-about .yj-media__inner {
  border: 1px solid var(--yj-line);
  border-radius: var(--yj-r-md);
  overflow: hidden;
  background: var(--yj-turf-deep);
}

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

.page-about .yj-media__stamp {
  display: block;
  margin-top: .7rem;
  font-family: var(--yj-font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--yj-slate);
}

/* ---------- 阶段长滚动 ---------- */
.page-about .about-chron {
  border-top: 1px solid var(--yj-line);
}

.page-about .about-chron__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.4rem, 4vw, 3rem);
}

.page-about .about-chron__rail {
  display: none;
}

.page-about .about-chron__rail-title {
  margin: 0 0 1.1rem;
  font-family: var(--yj-font-mono);
  font-size: .68rem;
  letter-spacing: .24em;
  color: var(--yj-slate);
}

.page-about .about-chron__scale {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about .about-chron__scale::before {
  content: "";
  position: absolute;
  left: .55rem;
  top: .45rem;
  bottom: .45rem;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--yj-mint), var(--yj-volt) 62%, transparent);
  opacity: .42;
}

.page-about .about-chron__item a {
  position: relative;
  display: grid;
  grid-template-columns: 1.1rem minmax(0, 1fr);
  align-items: center;
  gap: .6rem;
  font-family: var(--yj-font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--yj-slate);
  text-decoration: none;
  transition: color .3s var(--yj-ease);
}

.page-about .about-chron__item a::before {
  content: "";
  justify-self: center;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yj-turf);
  border: 1px solid var(--yj-line-mint);
  transition: background .3s var(--yj-ease), box-shadow .3s var(--yj-ease);
}

.page-about .about-chron__item a:hover,
.page-about .about-chron__item a:focus-visible {
  color: var(--yj-mint);
}

.page-about .about-chron__item a:hover::before,
.page-about .about-chron__item a:focus-visible::before {
  background: var(--yj-mint);
  box-shadow: 0 0 0 4px rgba(57, 242, 180, .16);
}

.page-about .about-chron__flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-flow-gap);
  min-width: 0;
}

/* ---------- 单个阶段 ---------- */
.page-about .about-node {
  position: relative;
  padding-bottom: clamp(1.6rem, 4vw, 2.4rem);
  border-bottom: 1px solid var(--yj-line);
  min-width: 0;
}

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

.page-about .about-node__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1rem;
}

.page-about .about-node__stamp {
  flex: none;
  padding: .16rem .55rem;
  font-family: var(--yj-font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--yj-amber);
  border: 1px solid rgba(240, 181, 66, .34);
  border-radius: var(--yj-cap);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--yj-font-serif);
  font-weight: 600;
  font-size: clamp(1.32rem, 3.6vw, 1.95rem);
  line-height: 1.32;
  color: var(--yj-bone);
}

.page-about .about-node p {
  max-width: 64ch;
  margin: 0 0 1rem;
  color: var(--yj-mist);
  font-size: clamp(.97rem, 2.2vw, 1.05rem);
  line-height: 1.85;
}

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

.page-about .about-node a {
  color: var(--yj-mint);
  text-decoration: none;
  border-bottom: 1px solid var(--yj-line-mint);
  transition: border-color .3s var(--yj-ease), color .3s var(--yj-ease);
}

.page-about .about-node a:hover,
.page-about .about-node a:focus-visible {
  border-bottom-color: var(--yj-mint);
}

.page-about .about-node__media {
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

/* ---------- 筛选方式列表 ---------- */
.page-about .about-filters {
  list-style: none;
  margin: 1.3rem 0 1.4rem;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-filters li {
  display: grid;
  grid-template-columns: 2.3rem minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding: .95rem 1.1rem;
  border: 1px solid var(--yj-line);
  border-radius: var(--yj-r-sm);
  background: rgba(22, 51, 42, .52);
  transition: border-color .35s var(--yj-ease), transform .35s var(--yj-ease);
}

.page-about .about-filters__num {
  padding-top: .18rem;
  font-family: var(--yj-font-mono);
  font-size: .8rem;
  color: var(--yj-clay);
}

.page-about .about-filters__text {
  color: var(--yj-mist);
  font-size: .95rem;
  line-height: 1.72;
}

.page-about .about-filters__text strong {
  display: block;
  margin-bottom: .2rem;
  font-weight: 600;
  color: var(--yj-bone);
}

/* ---------- 岗位卡片 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}

.page-about .about-roles li {
  padding: 1rem 1.15rem;
  border: 1px solid var(--yj-line);
  border-radius: var(--yj-r-sm);
  background: var(--yj-panel);
  transition: border-color .35s var(--yj-ease), transform .35s var(--yj-ease);
}

.page-about .about-roles strong {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--yj-font-mono);
  font-weight: 500;
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--yj-amber);
}

.page-about .about-roles span {
  display: block;
  color: var(--yj-mist);
  font-size: .93rem;
  line-height: 1.72;
}

/* ---------- 天津区块（米白底交替） ---------- */
.page-about .about-tianjin {
  margin: clamp(1.6rem, 5vw, 4rem) clamp(.6rem, 2vw, 1.6rem) clamp(1.6rem, 5vw, 3.4rem);
  padding: clamp(2rem, 6vw, 4.2rem) clamp(1.2rem, 4vw, 3.4rem);
  background: var(--yj-bone);
  border-radius: var(--yj-r-lg);
}

.page-about .about-tianjin__eyebrow {
  margin: 0 0 .8rem;
  font-family: var(--yj-font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: #6E7A72;
}

.page-about .about-tianjin__title {
  margin: 0 0 1.2rem;
  font-family: var(--yj-font-serif);
  font-weight: 600;
  font-size: clamp(1.35rem, 4vw, 2.1rem);
  line-height: 1.3;
  color: var(--yj-night);
}

.page-about .about-tianjin__text {
  max-width: 62ch;
  margin: 0 0 .95rem;
  color: rgba(12, 30, 24, .78);
  font-size: clamp(.97rem, 2.2vw, 1.03rem);
  line-height: 1.85;
  word-break: break-word;
}

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

.page-about .about-tianjin a {
  color: var(--yj-night);
  text-decoration: none;
  border-bottom: 1px solid rgba(12, 30, 24, .42);
  transition: border-color .3s var(--yj-ease);
}

.page-about .about-tianjin a:hover,
.page-about .about-tianjin a:focus-visible {
  border-bottom-color: var(--yj-night);
}

/* ---------- 交互与响应式 ---------- */
@media (hover: hover) {
  .page-about .about-filters li:hover {
    border-color: var(--yj-line-mint);
    transform: translateY(-2px);
  }

  .page-about .about-roles li:hover {
    border-color: var(--yj-line-mint);
    transform: translateY(-3px);
  }
}

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

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

@media (min-width: 960px) {
  .page-about .about-chron__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.6rem);
  }

  .page-about .about-chron__rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--yj-head) + 3rem);
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__frame::after {
    display: none;
  }

  .page-about .about-hero__title {
    max-width: 100%;
  }

  .page-about .about-filters li {
    grid-template-columns: 2rem minmax(0, 1fr);
    gap: .7rem;
    padding: .85rem .9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }

  .page-about .about-filters li:hover,
  .page-about .about-roles li:hover {
    transform: none;
  }
}