.page-about {
  --about-rail-w: 15.5rem;
  --about-gap: clamp(2rem, 5vw, 4rem);
  --about-text: rgba(215, 225, 234, .8);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(2.5rem, 7vw, 5rem) clamp(2.25rem, 6vw, 4rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.6rem);
  max-width: 68rem;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(1rem, 2vw, 1.14rem);
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: .35rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta li {
  padding: .42rem .85rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius-pill);
  background: rgba(18, 58, 90, .5);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: rgba(215, 225, 234, .72);
}

/* ---------- 主体：窄栏索引 + 宽栏长文 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
}

.page-about .about-rail__inner {
  display: grid;
  gap: .9rem;
  padding: 1rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(18, 58, 90, .55), rgba(11, 31, 51, .2));
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: grid;
  gap: .18rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: .5rem .6rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: .9rem;
  color: rgba(215, 225, 234, .74);
  text-decoration: none;
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--signal-soft);
  border-color: rgba(255, 106, 42, .32);
  color: var(--paper);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .about-rail__stamp {
  display: grid;
  gap: .25rem;
  margin: 0;
  padding-top: .85rem;
  border-top: 1px dashed var(--hair-strong);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-rail__stamp b {
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.5rem);
  min-width: 0;
}

.page-about .about-stage {
  display: grid;
  gap: 1.35rem;
  min-width: 0;
  scroll-margin-top: 5.5rem;
}

.page-about .about-stage__head {
  display: grid;
  gap: .5rem;
}

.page-about .about-stage__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .24em;
  color: var(--signal);
}

.page-about .about-stage__title {
  margin: 0;
  max-width: 30ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.42rem, 3.6vw, 2.15rem);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-stage__body {
  display: grid;
  gap: 1rem;
}

.page-about .about-stage__body p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-stage__foot {
  margin: 0;
  padding: .9rem 1.1rem;
  border-left: 3px solid var(--signal);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(18, 58, 90, .5);
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(215, 225, 234, .86);
}

/* ---------- 图像 ---------- */
.page-about .about-figure {
  margin: 0;
}

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

/* ---------- 四个小组 ---------- */
.page-about .about-crews {
  display: grid;
  gap: .85rem;
  grid-template-columns: 1fr;
}

.page-about .about-crew {
  display: grid;
  gap: .45rem;
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(18, 58, 90, .55), rgba(11, 31, 51, .28));
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-crew:hover {
  border-color: rgba(255, 106, 42, .34);
  transform: translateY(-2px);
}

.page-about .about-crew__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-crew__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--paper);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--about-text);
}

/* ---------- 区域图例 ---------- */
.page-about .about-regions {
  display: grid;
  gap: .6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-region {
  display: grid;
  gap: .3rem;
  padding: .9rem 1rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  background: rgba(18, 58, 90, .38);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-region:hover {
  background: rgba(18, 58, 90, .72);
  border-color: rgba(91, 192, 235, .35);
}

.page-about .about-region__name {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--link);
}

.page-about .about-region__desc {
  font-size: .93rem;
  line-height: 1.72;
  color: var(--about-text);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 1.55rem;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 1px solid var(--hair-strong);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: .3rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  margin-left: -.25rem;
  top: .45rem;
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, .14);
}

.page-about .about-timeline__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--about-text);
}

/* ---------- 行业认可 ---------- */
.page-about .about-honors {
  display: grid;
  gap: .6rem;
  padding: 1.1rem 1.25rem;
  border: 1px dashed var(--hair-strong);
  border-radius: var(--radius-md);
  background: rgba(242, 184, 75, .06);
}

.page-about .about-honors__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .about-honors__list {
  display: grid;
  gap: .4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honors__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .95rem;
  line-height: 1.7;
  color: rgba(215, 225, 234, .86);
}

.page-about .about-honors__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .45rem;
  height: .45rem;
  border-radius: 50%;
  background: var(--amber);
}

/* ---------- 行动区 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

.page-about .about-outro {
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--hair);
  background: linear-gradient(180deg, rgba(18, 58, 90, .5), rgba(7, 21, 34, .9));
}

.page-about .about-outro__inner {
  display: grid;
  gap: 1.25rem;
  align-items: center;
}

.page-about .about-outro__title {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-outro__text {
  margin: 0;
  max-width: 48ch;
  font-size: .96rem;
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 断点 ---------- */
@media (min-width: 40rem) {
  .page-about .about-crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-region {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: .25rem 1rem;
    align-items: baseline;
  }
}

@media (min-width: 48rem) {
  .page-about .about-outro__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2rem;
  }
}

@media (min-width: 60rem) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 5rem;
  }

  .page-about .about-stage__body {
    max-width: 46rem;
  }

  .page-about .about-figure {
    max-width: 52rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew,
  .page-about .about-region,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-crew:hover {
    transform: none;
  }
}