/* ===================== page-about ===================== */
.page-about {
  position: relative;
  background: var(--bg);
  color: var(--cream);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-about .about-kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--orange);
  flex: none;
}

.page-about .about-h2 {
  margin: 12px 0 16px;
  font-size: clamp(26px, 4.6vw, 46px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 2.6vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--rock);
}

.page-about .about-crumbs a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--blue);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-bottom: clamp(22px, 4vw, 46px);
}

.page-about .about-hero__band {
  position: absolute;
  top: 0;
  right: 0;
  width: min(64%, 760px);
  height: 100%;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(30, 144, 255, .16) 0%, rgba(30, 144, 255, 0) 70%),
    linear-gradient(200deg, rgba(76, 107, 79, .28) 0%, rgba(76, 107, 79, 0) 62%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 76%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-top: clamp(24px, 4.4vw, 58px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  max-width: 22ch;
  font-size: clamp(32px, 7.4vw, 76px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--cream);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--blue);
  font-weight: 400;
}

.page-about .about-hero__lede {
  max-width: 64ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 概况数据 ---------- */
.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 16px;
  background: var(--panel);
  transition: background .25s var(--ease);
}

.page-about .about-facts__row:hover {
  background: var(--panel-deep);
}

.page-about .about-facts dt {
  font-size: 13px;
  color: var(--rock);
  line-height: 1.5;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.2vw, 21px);
  letter-spacing: -.01em;
  color: var(--neon);
  white-space: nowrap;
}

/* ---------- 宽幅图 ---------- */
.page-about .about-wide {
  display: grid;
  gap: 12px;
  margin: clamp(26px, 5vw, 56px) 0 0;
}

.page-about .about-wide__frame {
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--panel-deep);
  border: 1px solid var(--line-soft);
}

.page-about .about-wide__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-wide__cap,
.page-about .about-flow__cap,
.page-about .about-partners__cap {
  display: block;
  font-size: 12px;
  line-height: 1.7;
  color: var(--rock);
  font-family: var(--font-mono);
  letter-spacing: .03em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(46px, 8vw, 104px) 0 0;
}

.page-about .about-head {
  max-width: 72ch;
  margin-bottom: clamp(26px, 4vw, 48px);
}

/* ---------- 时间线 ---------- */
.page-about .about-line {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  max-width: 78ch;
  border-left: 1px solid var(--line);
}

.page-about .about-line__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px);
  outline: none;
}

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

.page-about .about-line__dot {
  position: absolute;
  left: -31px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 4px var(--bg);
  transition: background .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-line__item:nth-child(2) .about-line__dot { background: var(--blue); }
.page-about .about-line__item:nth-child(3) .about-line__dot { background: var(--clay); }
.page-about .about-line__item:nth-child(4) .about-line__dot { background: var(--orange); }

.page-about .about-line__item:hover .about-line__dot,
.page-about .about-line__item:focus-visible .about-line__dot,
.page-about .about-line__item:focus-within .about-line__dot {
  background: var(--neon);
  transform: scale(1.4);
}

.page-about .about-line__item:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 8px;
  border-radius: var(--r-sm);
}

.page-about .about-line__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--rock);
  margin-bottom: 6px;
}

.page-about .about-line__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.4vw, 23px);
  font-weight: 400;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .about-line__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-line__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--rock);
  border-left: 2px solid var(--line);
  padding-left: 0;
  transition: max-height .45s var(--ease), opacity .3s var(--ease), padding .35s var(--ease);
}

.page-about .about-line__item:hover .about-line__more,
.page-about .about-line__item:focus-visible .about-line__more,
.page-about .about-line__item:focus-within .about-line__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 10px;
  padding-left: 14px;
  border-left-color: var(--blue);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-team__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--rock);
  max-width: 42ch;
}

.page-about .about-crews {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-crews__item {
  position: relative;
  padding: 20px 18px 20px 58px;
  background: var(--panel);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-crews__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  transition: background .3s var(--ease);
}

.page-about .about-crews__item:hover {
  background: var(--panel-deep);
  box-shadow: inset 0 0 0 1px var(--glass-strong);
}

.page-about .about-crews__item:hover::after {
  background: var(--blue);
}

.page-about .about-crews__num {
  position: absolute;
  left: 18px;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-crews__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 500;
  color: var(--cream);
}

.page-about .about-crews__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 核校流程 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-flow__media {
  display: grid;
  gap: 12px;
  align-self: start;
}

.page-about .about-flow__frame {
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--panel-deep);
  border: 1px solid var(--line-soft);
}

.page-about .about-flow__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 16px 0;
  border-top: 1px solid var(--line-soft);
  transition: border-color .3s var(--ease);
}

.page-about .about-steps__item:hover {
  border-top-color: var(--blue);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--rock);
  letter-spacing: -.02em;
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 500;
  color: var(--cream);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-head--split {
  max-width: none;
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
  align-items: center;
}

.page-about .about-partners__text {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-partners__tags {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-partners__figure {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__frame {
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--panel-deep);
  border: 1px solid var(--line-soft);
}

.page-about .about-partners__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 日常做法 ---------- */
.page-about .about-practice__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-practice__item {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--r-md);
  background: var(--glass);
  border: 1px solid var(--line-soft);
  backdrop-filter: blur(6px);
  transition: background .3s var(--ease), transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-practice__item:hover {
  background: var(--panel);
  border-color: var(--glass-strong);
  transform: translateY(-3px);
}

.page-about .about-practice__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .about-practice__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 500;
  color: var(--cream);
}

.page-about .about-practice__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-about .about-next__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(30px, 5vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-next__link {
  display: block;
  width: 100%;
  text-align: left;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    align-items: start;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 28px;
  }

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

@media (max-width: 719px) {
  .page-about .about-hero__band {
    width: 88%;
    clip-path: polygon(40% 0, 100% 0, 100% 100%, 0 88%);
  }

  .page-about .about-line {
    padding-left: 20px;
  }

  .page-about .about-line__dot {
    left: -25px;
  }

  .page-about .about-line__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
    padding-left: 12px;
    border-left-color: var(--line);
  }

  .page-about .about-facts__row {
    padding: 12px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-practice__item,
  .page-about .about-line__more,
  .page-about .about-line__dot {
    transition: none;
  }
}