.page-about {
  --about-num-color: rgba(201, 164, 92, .55);
  --about-track: rgba(201, 164, 92, .13);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(.9rem, 2.4vw, 1.6rem);
}

.page-about .about-crumb .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--muted);
}

.page-about .about-crumb .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}

.page-about .about-crumb .breadcrumb li + li::before {
  content: "/";
  color: rgba(153, 170, 161, .45);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .about-crumb .breadcrumb a:hover,
.page-about .about-crumb .breadcrumb a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.8rem) clamp(2.4rem, 5.5vw, 4.2rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -8%;
  z-index: -1;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(234, 245, 238, .035) 0 1px, transparent 1px 88px),
    linear-gradient(112deg, transparent 46%, rgba(34, 242, 210, .07) 46%, rgba(34, 242, 210, .07) 46.6%, transparent 46.6%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 1fr);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: .55rem 0 1rem;
  max-width: 13em;
  font-size: clamp(2.1rem, 5.4vw, 4rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(.98rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__figure {
  margin: 0;
  aspect-ratio: 14 / 9;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

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

.page-about .about-hero__badge {
  margin-top: 1rem;
  padding: 1rem 1.15rem 1.1rem;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.page-about .about-hero__badge p {
  margin: .45rem 0 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(2.4rem, 5.6vw, 4.4rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec--band {
  position: relative;
  overflow: hidden;
  background: var(--bg-2);
}

.page-about .about-sec--band::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(201, 164, 92, .05) 0 2px, transparent 2px 24px);
}

.page-about .about-sec--band .about-grid {
  position: relative;
  z-index: 1;
}

.page-about .about-grid {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2.2rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-sec__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -.05em;
  color: var(--about-num-color);
}

.page-about .about-grid__body > h2 {
  margin: .2rem 0 .9rem;
  font-size: clamp(1.55rem, 3.4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.01em;
}

.page-about .about-grid__body > p {
  margin: 0 0 .9rem;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-grid__body > p:last-of-type {
  margin-bottom: 0;
}

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

/* ---------- 01 三条路径 ---------- */
.page-about .about-paths {
  display: grid;
  gap: .85rem;
  grid-template-columns: minmax(0, 1fr);
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-paths__item {
  padding: 1.05rem 1.05rem 1.15rem;
  background: var(--surface);
  border-radius: var(--radius);
  border-top: 2px solid var(--cyan);
}

.page-about .about-paths__item:nth-child(2) {
  border-top-color: var(--sand);
}

.page-about .about-paths__item:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .about-paths__idx {
  display: inline-block;
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .about-paths__item h3 {
  margin: .35rem 0 .45rem;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-paths__item p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 通用小卡 ---------- */
.page-about .about-note {
  padding: 1.1rem 1.15rem 1.2rem;
  border-radius: var(--radius);
}

.page-about .about-note__steps {
  display: grid;
  gap: .55rem;
  margin: .8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-note__steps li {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  font-size: .87rem;
  line-height: 1.55;
  color: var(--text);
}

.page-about .about-note__steps .mono {
  flex: none;
  font-size: .74rem;
  color: var(--cyan);
}

.page-about .about-note__foot {
  margin: .9rem 0 0;
  font-size: .78rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline {
  margin: 1.7rem 0 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline > li {
  position: relative;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: .85rem;
  width: 9px;
  height: 9px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--sand);
  box-shadow: 0 0 0 4px var(--about-track);
}

.page-about .about-timeline summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .55rem;
  padding: .5rem .2rem .5rem 0;
  list-style: none;
  cursor: pointer;
  border-radius: var(--radius-s);
}

.page-about .about-timeline summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline summary::marker {
  content: "";
}

.page-about .about-timeline summary:hover .about-timeline__title {
  color: var(--cyan);
}

.page-about .about-timeline summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-timeline__year {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--sand);
}

.page-about .about-timeline__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  transition: color .18s var(--ease);
}

.page-about .about-timeline__sign {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-timeline__sign::before {
  content: "+";
}

.page-about .about-timeline details[open] .about-timeline__sign::before {
  content: "–";
}

.page-about .about-timeline details[open] .about-timeline__title {
  color: var(--cyan);
}

.page-about .about-timeline__body {
  padding: .1rem 0 .8rem;
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 48ch;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hist__figure {
  margin: 0;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

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

/* ---------- 03 团队 ---------- */
.page-about .about-team__figure {
  margin: 1.4rem 0 0;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

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

.page-about .about-team__grid {
  display: grid;
  gap: .8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__grid li {
  padding: .95rem .9rem 1.05rem;
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-team__grid li:hover {
  border-color: rgba(34, 242, 210, .45);
  transform: translateY(-2px);
}

.page-about .about-team__num {
  display: block;
  font-size: 1.7rem;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-team__grid h3 {
  margin: .5rem 0 .35rem;
  font-size: .94rem;
  font-weight: 700;
}

.page-about .about-team__grid p {
  margin: 0;
  font-size: .82rem;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-factcard {
  padding: 1.05rem 1.15rem 1.15rem;
  border-radius: var(--radius);
}

.page-about .about-factcard__list {
  display: grid;
  gap: .7rem;
  margin: .8rem 0 0;
}

.page-about .about-factcard__list > div {
  display: grid;
  gap: .1rem;
}

.page-about .about-factcard__list dt {
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .06em;
  color: var(--sand);
}

.page-about .about-factcard__list dd {
  margin: 0;
  font-size: .84rem;
  line-height: 1.62;
  color: var(--muted);
}

/* ---------- 04 数据来源 ---------- */
.page-about .about-figures {
  display: grid;
  gap: .75rem;
}

.page-about .about-figures__item {
  padding: 1rem 1.1rem 1.05rem;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-about .about-figures__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .about-figures__num--cyan {
  color: var(--cyan);
}

.page-about .about-figures__num--sand {
  color: var(--sand);
}

.page-about .about-figures__label {
  display: block;
  margin-top: .38rem;
  font-size: .81rem;
  line-height: 1.58;
  color: var(--muted);
}

/* ---------- 05 覆盖范围 ---------- */
.page-about .about-scope__grid {
  display: grid;
  gap: .7rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scope__grid li {
  padding: .9rem 1rem 1rem;
  background:
    linear-gradient(160deg, rgba(201, 164, 92, .14), transparent 68%),
    var(--surface);
  border-radius: var(--radius);
  border-left: 2px solid var(--sand);
}

.page-about .about-scope__grid b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-scope__grid span {
  display: block;
  margin-top: .32rem;
  font-size: .79rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-projects {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: .85rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-projects li {
  padding: .26rem .62rem;
  border: 1px solid rgba(201, 164, 92, .4);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--sand);
}

/* ---------- 06 认可与下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: .9rem;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 1.5rem;
}

.page-about .about-next__grid > div {
  padding: 1.05rem 1.15rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .about-next__grid h3 {
  margin: .6rem 0 .4rem;
  font-size: 1rem;
  font-weight: 700;
}

.page-about .about-next__grid p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(2.4rem, 5vw, 3.6rem) clamp(2.6rem, 5.5vw, 4.2rem);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 150% at 10% 0%, rgba(34, 242, 210, .1), transparent 58%),
    var(--bg-2);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .about-cta h2 {
  margin: .5rem 0 .6rem;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.01em;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46ch;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 760px) {
  .page-about .about-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: 5.5rem minmax(0, 1fr) minmax(0, 19rem);
    gap: clamp(1.4rem, 3vw, 2.6rem);
    align-items: start;
  }

  .page-about .about-grid--two {
    grid-template-columns: 5.5rem minmax(0, 1fr);
  }

  .page-about .about-sec__num {
    font-size: clamp(2.8rem, 5vw, 4.4rem);
  }

  .page-about .about-hist__figure {
    margin-top: .4rem;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2.4rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-about .about-hero__badge {
    position: relative;
    z-index: 2;
    width: min(19rem, 88%);
    margin-top: -2.6rem;
    margin-left: auto;
    margin-right: 1.1rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__grid li,
  .page-about .about-timeline__title {
    transition: none;
  }

  .page-about .about-team__grid li:hover {
    transform: none;
  }
}