.page-about {
  --about-toc: 15rem;
  --about-rule: rgba(28, 23, 20, .16);
  --about-link: #0e6b78;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  background: var(--abyss);
  color: var(--white);
  overflow: hidden;
  padding-top: clamp(1.25rem, 4vw, 2.25rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10%;
  background: repeating-linear-gradient(115deg, rgba(0, 194, 209, .07) 0 1px, transparent 1px 44px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .breadcrumbs ul {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  padding: 0;
  list-style: none;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: .45rem;
  color: var(--steel);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--lime);
}

.page-about .about-hero .kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--coral);
  margin: 0 0 .85rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-title);
  font-size: clamp(2.35rem, 7.4vw, 4.6rem);
  font-weight: 700;
  line-height: .98;
  letter-spacing: -.015em;
  margin: 0 0 clamp(1rem, 2.5vw, 1.4rem);
  color: var(--white);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  font-size: clamp(1rem, 2.1vw, 1.12rem);
  line-height: 1.8;
  color: rgba(247, 251, 255, .8);
  max-width: 34rem;
  margin: 0;
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(1.25rem, 3vw, 1.7rem) clamp(1.25rem, 3vw, 1.6rem) calc(clamp(1.25rem, 3vw, 1.7rem) + 14px);
  background: linear-gradient(150deg, rgba(11, 39, 64, .95) 0%, rgba(6, 26, 46, .7) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.1rem, 3vw, 1.6rem) 1rem;
  align-content: start;
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 3px;
  background: var(--coral);
}

.page-about .hstat {
  min-width: 0;
}

.page-about .hstat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.01em;
}

.page-about .hstat__label {
  display: block;
  margin-top: .45rem;
  font-size: .76rem;
  letter-spacing: .06em;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  height: clamp(190px, 36vw, 400px);
  overflow: hidden;
  clip-path: polygon(0 12%, 100% 0, 100% 100%, 0 100%);
  background: var(--deep);
}

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

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 26, 46, .1) 0%, rgba(6, 26, 46, .82) 100%);
  pointer-events: none;
}

/* ============ 正文骨架 ============ */
.page-about .about-body {
  background: var(--cream);
  padding: clamp(2.25rem, 6vw, 4.25rem) 0 clamp(2.75rem, 7vw, 4.5rem);
}

.page-about .about-body__inner {
  display: block;
}

.page-about .about-toc {
  margin-bottom: clamp(2rem, 5vw, 2.75rem);
}

.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 .7rem;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.page-about .about-toc__list a {
  display: block;
  padding: .38rem .72rem;
  font-size: .82rem;
  line-height: 1.3;
  text-decoration: none;
  color: #2f5a6f;
  background: rgba(46, 90, 115, .08);
  border: 1px solid rgba(46, 90, 115, .28);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--abyss);
  background: rgba(0, 194, 209, .16);
  border-color: var(--cyan);
}

.page-about .about-flow {
  min-width: 0;
}

/* ============ 章节 ============ */
.page-about .about-sec + .about-sec {
  margin-top: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .about-sec__head {
  display: flex;
  align-items: center;
  gap: .9rem;
  margin-bottom: clamp(1.15rem, 3vw, 1.6rem);
  padding: .75rem clamp(1rem, 2.5vw, 1.4rem);
  background-color: var(--abyss);
  background-image: repeating-linear-gradient(115deg, rgba(0, 194, 209, .09) 0 1px, transparent 1px 20px);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-sec__head h2 {
  font-family: var(--font-title);
  font-size: clamp(1.28rem, 3.4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.15;
  margin: 0;
  color: var(--white);
}

.page-about .about-prose p {
  font-size: clamp(.96rem, 1.6vw, 1.04rem);
  line-height: 1.85;
  margin: 0 0 1.05rem;
  color: var(--ink);
}

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

.page-about .about-prose a {
  color: var(--about-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--coral);
}

/* ============ 数据方法配图 ============ */
.page-about .about-figure {
  margin: clamp(1.5rem, 4vw, 2rem) 0;
  overflow: hidden;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  background: var(--deep);
}

.page-about .about-figure img {
  width: 100%;
  height: clamp(190px, 34vw, 320px);
  object-fit: cover;
  display: block;
}

.page-about .about-figure__caption {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  line-height: 1.6;
  color: var(--mist);
  background: var(--abyss);
  padding: .7rem clamp(1rem, 3vw, 1.4rem);
}

/* ============ 规模数据块 ============ */
.page-about .about-metrics {
  margin: clamp(1.5rem, 4vw, 2rem) 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-metrics__cell {
  background: var(--cream);
  padding: 1rem 1.05rem 1.15rem;
  min-width: 0;
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.8vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--abyss);
  letter-spacing: -.02em;
}

.page-about .about-metrics__num--hot {
  color: var(--coral);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: .45rem;
  font-size: .78rem;
  line-height: 1.55;
  color: rgba(28, 23, 20, .64);
}

/* ============ 团队 ============ */
.page-about .about-team {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0;
  padding: 0;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: .2rem .9rem;
  padding: .95rem 0;
  border-bottom: 1px dashed rgba(28, 23, 20, .24);
}

.page-about .about-team__row:first-child {
  border-top: 1px dashed rgba(28, 23, 20, .24);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--abyss);
}

.page-about .about-team__role {
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--abyss);
  align-self: center;
}

.page-about .about-team__desc {
  grid-column: 2 / -1;
  font-size: .88rem;
  line-height: 1.7;
  color: rgba(28, 23, 20, .7);
}

/* ============ 时间线 ============ */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: .58rem;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 194, 209, .12) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.3rem;
}

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: clamp(1.5rem, 4vw, 2.1rem);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: .21rem;
  top: .5rem;
  width: .78rem;
  height: .78rem;
  background: var(--cream);
  border: 2px solid var(--steel);
  transform: rotate(45deg);
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--coral);
  border-color: var(--coral);
  transform: rotate(45deg) scale(1.2);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--white);
  background: var(--deep);
  padding: .2rem .6rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.page-about .about-timeline__body h3 {
  font-family: var(--font-title);
  font-size: clamp(1.08rem, 2.6vw, 1.32rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.005em;
  color: var(--abyss);
  margin: .6rem 0 .35rem;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.8;
  color: rgba(28, 23, 20, .74);
}

.page-about .about-strip {
  margin: clamp(1.75rem, 4.5vw, 2.5rem) 0 0;
  position: relative;
  overflow: hidden;
  background: var(--abyss);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.page-about .about-strip img {
  width: 100%;
  height: clamp(170px, 30vw, 290px);
  object-fit: cover;
  display: block;
}

.page-about .about-strip__caption {
  position: absolute;
  left: clamp(1rem, 3vw, 1.5rem);
  bottom: clamp(1.5rem, 4vw, 2.4rem);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--white);
  text-shadow: 0 1px 12px rgba(6, 26, 46, .9);
  max-width: 80%;
}

/* ============ 下一步入口 ============ */
.page-about .about-next {
  position: relative;
  background: var(--abyss);
  color: var(--white);
  padding: clamp(2.5rem, 6vw, 4.25rem) 0 clamp(2.75rem, 7vw, 4.75rem);
  overflow: hidden;
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, rgba(0, 194, 209, .06) 0 1px, transparent 1px 36px);
  pointer-events: none;
}

.page-about .about-next__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-next h2 {
  font-family: var(--font-title);
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  margin: 0 0 .7rem;
  color: var(--white);
}

.page-about .about-next__lede {
  font-size: clamp(.94rem, 1.8vw, 1.02rem);
  line-height: 1.8;
  color: rgba(247, 251, 255, .74);
  max-width: 40rem;
  margin: 0 0 clamp(1.75rem, 4vw, 2.25rem);
}

.page-about .about-next__grid {
  display: grid;
  gap: 1px;
  background: rgba(143, 184, 204, .26);
  border: 1px solid rgba(143, 184, 204, .26);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.3rem 1.2rem 1.5rem;
  background: var(--abyss);
  text-decoration: none;
  color: var(--white);
  transition: background .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--deep);
  transform: translateY(-3px);
}

.page-about .about-next__tag {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-next__card strong {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--white);
}

.page-about .about-next__desc {
  font-size: .87rem;
  line-height: 1.75;
  color: rgba(247, 251, 255, .72);
}

.page-about .about-next__card:hover .about-next__tag,
.page-about .about-next__card:focus-visible .about-next__tag {
  color: var(--coral);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-team__row {
    grid-template-columns: 3.6rem 7.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: .3rem 1rem;
    padding: 1rem 0;
  }

  .page-about .about-team__desc {
    grid-column: auto;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 3.5rem);
  }

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

@media (min-width: 1000px) {
  .page-about .about-body__inner {
    display: grid;
    grid-template-columns: var(--about-toc) minmax(0, 1fr);
    gap: clamp(2.5rem, 6vw, 4.75rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: clamp(5.5rem, 11vh, 7rem);
    margin-bottom: 0;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: .1rem;
  }

  .page-about .about-toc__list a {
    padding: .42rem 0 .42rem .9rem;
    background: none;
    border: 0;
    border-left: 2px solid rgba(46, 90, 115, .32);
    border-radius: 0;
    clip-path: none;
    font-family: var(--font-mono);
    font-size: .76rem;
    letter-spacing: .05em;
    color: var(--steel);
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    border-left-color: var(--coral);
    background: none;
    color: var(--abyss);
  }
}

@media (min-width: 1100px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-hero::before {
    animation: about-drift 34s linear infinite;
  }
}

@keyframes about-drift {
  from { background-position: 0 0; }
  to { background-position: 440px 0; }
}