.page-about {
  --about-pad: clamp(2.4rem, 6.5vw, 4.4rem);
  --about-gap: clamp(1.2rem, 3.5vw, 2.4rem);
  color: var(--body-text);
  background: var(--ink-900);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(1rem, 2.5vw, 1.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.6rem, 4.5vw, 3rem) clamp(1.8rem, 5vw, 3.2rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -2rem;
  width: 62%;
  height: 17rem;
  background: linear-gradient(118deg, rgba(79, 240, 208, 0.14), rgba(242, 183, 91, 0.07) 55%, rgba(7, 17, 31, 0) 78%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 74%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__title {
  margin: 0.85rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.95rem, 6.4vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: 0.012em;
  color: var(--mist);
}

.page-about .about-hero__text {
  margin: 1.1rem 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.15vw, 1.1rem);
  line-height: 1.78;
  color: var(--body-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

/* 速览卡 */
.page-about .about-factcard {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.7rem);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(158deg, rgba(11, 27, 46, 0.96), rgba(7, 17, 31, 0.94));
  box-shadow: inset 0 0 0 1px rgba(79, 240, 208, 0.04);
}

.page-about .about-factcard::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan), var(--gold) 70%, var(--magenta));
}

.page-about .about-factcard__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-factcard__list {
  margin: 0;
}

.page-about .about-factcard__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0;
  border-top: 1px solid var(--line);
}

.page-about .about-factcard__row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-factcard__row dt {
  font-size: 0.82rem;
  color: var(--slate);
  letter-spacing: 0.04em;
}

.page-about .about-factcard__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--mist);
  text-align: right;
}

.page-about .about-num {
  color: var(--gold);
  font-size: 1.05rem;
}

/* ---------- 通栏图 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(1.4rem, 4vw, 2.2rem);
  position: relative;
  border: 1px solid var(--line);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.04) brightness(0.92);
}

.page-about .about-banner__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.45rem 0.85rem;
  background: rgba(7, 17, 31, 0.82);
  border-top: 1px solid var(--line-gold);
  border-right: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  border-block: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(14, 92, 90, 0.16), rgba(7, 17, 31, 0) 70%);
  padding-block: 0.85rem;
  margin-bottom: clamp(1rem, 3vw, 1.6rem);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.25rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.42rem 0.78rem;
  border: 1px solid var(--line);
  font-size: 0.83rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  scroll-snap-align: start;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(79, 240, 208, 0.08);
  color: var(--cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  display: grid;
  gap: 0.9rem;
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
}

.page-about .chapter:first-of-type {
  border-top: 0;
  padding-top: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 8vw, 3.6rem);
  line-height: 1;
  letter-spacing: 0.03em;
  color: rgba(242, 183, 91, 0.14);
  -webkit-text-stroke: 1px rgba(242, 183, 91, 0.55);
}

.page-about .chapter__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.42rem, 3.6vw, 2.05rem);
  line-height: 1.3;
  color: var(--mist);
}

.page-about .chapter__body p {
  margin: 0 0 1rem;
  font-size: clamp(0.97rem, 1.1vw, 1.06rem);
  line-height: 1.78;
  color: var(--body-text);
}

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

.page-about .chapter__aside {
  padding-left: 0.9rem;
  border-left: 1px solid var(--line-gold);
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .chapter__aside p {
  margin: 0;
}

.page-about .chapter__aside-label {
  margin-bottom: 0.35rem !important;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

/* 章节配图 */
.page-about .about-figure {
  margin: 1.4rem 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.9);
}

/* ---------- 三条原则 ---------- */
.page-about .principle-grid {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .principle {
  position: relative;
  padding: 1.05rem 1rem 1.15rem;
  border: 1px solid var(--line);
  background: linear-gradient(170deg, rgba(11, 27, 46, 0.85), rgba(7, 17, 31, 0.6));
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .principle::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(79, 240, 208, 0));
  opacity: 0.4;
  transition: opacity 0.35s var(--ease);
}

.page-about .principle:hover,
.page-about .principle:focus-within {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .principle:hover::after {
  opacity: 1;
}

.page-about .principle__num {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--magenta);
}

.page-about .principle__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .principle__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--body-text);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0 0 0 1.7rem;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0.34rem;
  top: 0.5rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--cyan) 58%, rgba(79, 240, 208, 0.12));
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 1.7rem;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: 0.34rem;
  width: 0.62rem;
  height: 0.62rem;
  background: var(--ink-900);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.18rem;
  letter-spacing: 0.09em;
  color: var(--gold);
  margin-bottom: 0.28rem;
}

.page-about .about-tl__title {
  margin: 0 0 0.32rem;
  font-family: var(--font-display);
  font-size: 1.04rem;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--body-text);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-team__item {
  padding: 1rem 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-team__num {
  margin: 0 0 0.34rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-team__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.04rem;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-team__item p:last-child {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--body-text);
}

/* ---------- 站点信息 ---------- */
.page-about .about-meta {
  margin: 1.3rem 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-meta__row {
  display: grid;
  grid-template-columns: 6.2rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.72rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-meta__row dt {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-meta__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

.page-about .about-meta__row dd a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color 0.3s var(--ease);
}

.page-about .about-meta__row dd a:hover,
.page-about .about-meta__row dd a:focus-visible {
  color: var(--gold);
}

/* ---------- 页尾指引 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line-strong);
  padding-block: var(--about-pad);
}

.page-about .about-next__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
  font-size: 0.95rem;
  color: var(--mist);
  text-decoration: none;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--line-gold);
  background: rgba(242, 183, 91, 0.06);
  color: var(--gold);
}

.page-about .about-next__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-next__arrow {
  margin-left: auto;
  color: var(--slate);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-next__link:hover .about-next__arrow {
  transform: translateX(4px);
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1.6rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.82fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-banner img {
    aspect-ratio: 1400 / 780;
    max-height: 66vh;
  }

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

@media (min-width: 960px) {
  .page-about .chapter {
    grid-template-columns: 5.4rem minmax(0, 1fr) minmax(0, 14.5rem);
    column-gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .chapter__num {
    grid-column: 1;
    grid-row: 1;
    font-size: clamp(2.6rem, 4.4vw, 3.8rem);
  }

  .page-about .chapter__main {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .chapter__aside {
    grid-column: 3;
    grid-row: 1;
    margin-top: 0.7rem;
  }

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 1.2rem;
  }

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

  .page-about .about-next__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.55rem;
    padding: 1.05rem 0.9rem 1.2rem;
    min-height: 6.4rem;
  }

  .page-about .about-next__arrow {
    margin-left: 0;
    margin-top: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .about-index__link,
  .page-about .about-next__link,
  .page-about .about-next__arrow {
    transition: none;
  }

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