.page-about {
  overflow-x: clip;
  color: var(--stardust);
}

.page-about .section {
  padding: var(--space-section) 0;
}

.page-about .breadcrumb {
  padding-top: 1.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.6rem, 5vw, 3.4rem) 0 clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -1.2rem;
  left: 20%;
  right: -6vw;
  height: clamp(140px, 30vw, 280px);
  background: linear-gradient(118deg, rgba(124, 92, 255, .34), rgba(47, 224, 192, .1) 46%, rgba(246, 185, 59, .18));
  clip-path: polygon(0 24%, 100% 0, 92% 76%, 5% 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  color: var(--gold);
  letter-spacing: .16em;
}

.page-about .about-hero__title {
  margin: .7rem 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 3.8rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--white);
  transform: rotate(-1.1deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lede {
  max-width: 40ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--stardust);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta .mono-tag {
  color: var(--orbit);
}

/* ---------- 目录 + 首图 ---------- */
.page-about .about-intro {
  display: grid;
  gap: clamp(1.3rem, 3vw, 2.2rem);
  padding-bottom: clamp(.5rem, 2vw, 1.5rem);
}

.page-about .about-index {
  border: var(--line);
  background: linear-gradient(180deg, rgba(124, 92, 255, .12), transparent 62%), var(--ink-panel);
  box-shadow: var(--shadow-hard);
  padding: 1.3rem 1.3rem .6rem;
}

.page-about .about-index .eyebrow {
  margin: 0 0 .6rem;
  color: var(--orbit);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list li + li {
  border-top: 1px solid var(--ink-edge);
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  padding: .68rem .2rem;
  color: var(--stardust);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--gold);
  padding-left: .55rem;
}

.page-about .about-index__list .num {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: .08em;
}

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

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-head .panel__index {
  margin: 0 0 .8rem;
}

.page-about .about-head h2 {
  margin: 0 0 .7rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-head__lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--orbit);
}

/* ---------- 时间线 ---------- */
.page-about .chron {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .chron__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .85rem;
  padding-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .chron__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 1.5rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--ink-edge) 45%, transparent);
  opacity: .75;
}

.page-about .chron__item:last-child::before {
  display: none;
}

.page-about .chron__node {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem .7rem;
  padding-left: 2rem;
}

.page-about .chron__dot {
  position: absolute;
  left: 0;
  top: .28rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-void);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(246, 185, 59, .14);
  transition: background .3s var(--ease), box-shadow .3s var(--ease), transform .3s var(--ease);
}

.page-about .chron__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .chron__stage {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orbit);
}

.page-about .chron__panel {
  padding: clamp(1.1rem, 2.6vw, 1.7rem);
  transition: transform .3s var(--ease);
}

.page-about .chron__panel h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.35rem);
  letter-spacing: -.01em;
  line-height: 1.25;
  color: var(--white);
}

.page-about .chron__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--stardust);
}

.page-about .chron__more {
  display: block;
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .05em;
  color: var(--pulse);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
}

.page-about .team-card {
  border: var(--line);
  background: var(--ink-panel);
  box-shadow: var(--shadow-hard);
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
}

.page-about .team-card .mono {
  margin: 0 0 .5rem;
  color: var(--nebula);
  letter-spacing: .18em;
}

.page-about .team-card h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stardust);
}

.page-about .about-cta {
  margin-top: clamp(1.5rem, 4vw, 2.4rem);
}

/* ---------- 内容中心 ---------- */
.page-about .content-split {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .content-split__text p {
  margin: 0 0 1.1rem;
  font-size: 16px;
  line-height: 1.85;
  color: var(--stardust);
}

.page-about .content-split__figure {
  margin: 0;
}

.page-about .topic-grid {
  display: grid;
  gap: .7rem;
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
}

.page-about .topic {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  border-top: 3px solid var(--pulse);
  border-right: var(--line);
  border-bottom: var(--line);
  border-left: var(--line);
  background: rgba(12, 21, 51, .8);
  padding: .9rem 1rem;
}

.page-about .topic__num {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orbit);
}

.page-about .topic__name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .topic__count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}

/* ---------- 四条入口 ---------- */
.page-about .entries {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
}

.page-about .entry-card {
  --c: var(--gold);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .55rem;
  border: var(--line);
  background: var(--ink-panel);
  box-shadow: var(--shadow-hard);
  padding: 1.5rem 1.2rem 1.2rem;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.page-about .entry-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--c), rgba(255, 255, 255, .08));
}

.page-about .entry-card:hover {
  transform: translateY(-6px);
  border-color: var(--gold);
}

.page-about .entry-card--pulse { --c: var(--pulse); }
.page-about .entry-card--coral { --c: var(--coral); }
.page-about .entry-card--nebula { --c: var(--nebula); }
.page-about .entry-card--gold { --c: var(--gold); }

.page-about .entry-card .mono {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c);
}

.page-about .entry-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .entry-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stardust);
}

.page-about .entry-card__link {
  margin-top: auto;
  padding-top: .6rem;
  color: var(--c);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  align-self: flex-start;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .entry-card__link:hover,
.page-about .entry-card__link:focus-visible {
  border-bottom-color: var(--gold);
  color: var(--gold);
}

.page-about .entries__figure {
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
}

/* ---------- 接下来的安排 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

.page-about .next-item {
  border-left: 3px solid var(--gold);
  background: linear-gradient(90deg, rgba(246, 185, 59, .1), transparent 70%), var(--ink-panel);
  padding: 1.2rem 1.3rem;
}

.page-about .next-item .mono {
  margin: 0 0 .5rem;
  color: var(--gold);
  letter-spacing: .16em;
}

.page-about .next-item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stardust);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .entry-card {
    padding: 1.7rem 1.4rem 1.4rem;
  }
}

@media (min-width: 880px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    align-items: start;
  }

  .page-about .content-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .chron__item {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
  }

  .page-about .chron__node {
    flex-direction: column;
    gap: .35rem;
    padding-left: 2.1rem;
  }

  .page-about .chron__year {
    font-size: 17px;
  }

  .page-about .chron__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height .4s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
  }

  .page-about .chron__item:hover .chron__more,
  .page-about .chron__item:focus-within .chron__more {
    max-height: 6rem;
    opacity: 1;
    margin-top: .7rem;
  }

  .page-about .chron__item:hover .chron__dot {
    background: var(--gold);
    box-shadow: 0 0 0 8px rgba(246, 185, 59, .16);
    transform: scale(1.12);
  }

  .page-about .chron__item:hover .chron__panel {
    transform: translateX(4px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chron__dot,
  .page-about .chron__panel,
  .page-about .entry-card,
  .page-about .chron__more {
    transition: opacity .2s linear;
    transform: none;
  }

  .page-about .chron__item:hover .chron__panel,
  .page-about .entry-card:hover {
    transform: none;
  }
}