.page-about {
  --about-pad: clamp(2.4rem, 7vw, 5rem);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(1.1rem, 3.5vw, 2rem) var(--gutter) 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .breadcrumbs__sep {
  color: var(--line);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--cyan-dim);
}

/* ---------- 共用文字 ---------- */
.page-about .about-copy {
  margin: 0 0 1.05rem;
  color: var(--muted);
  font-size: clamp(0.95rem, 2.4vw, 1.05rem);
  line-height: 1.95;
  max-width: 68ch;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--zh);
  font-weight: 300;
  letter-spacing: 0.07em;
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.4rem, 4vw, 2.6rem) 0 clamp(2.6rem, 7vw, 5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4.5vw, 3.4rem);
  align-items: start;
}

.page-about .about-hero__media {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-md) var(--r-xl) var(--r-lg);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: linear-gradient(155deg, var(--ink-3), var(--ink-2) 60%, var(--ink));
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.84;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(122deg, transparent 54%, rgba(47, 230, 214, 0.16) 54.2%, rgba(47, 230, 214, 0.16) 54.7%, transparent 55%),
    repeating-linear-gradient(0deg, rgba(36, 64, 92, 0.45) 0 1px, transparent 1px 52px);
}

.page-about .about-hero__body h1 {
  margin: 0.55rem 0 1rem;
  font-size: clamp(1.9rem, 6.4vw, 3.35rem);
  line-height: 1.2;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 4vw, 2.3rem);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.95rem 1rem;
  background: var(--ink-2);
}

.page-about .about-stat__num {
  font-family: var(--mono);
  font-size: clamp(1.2rem, 3.6vw, 1.55rem);
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节外壳 ---------- */
.page-about .about-sec {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(0.7rem, 2vw, 1.2rem);
  margin-bottom: clamp(1.5rem, 4.5vw, 2.6rem);
}

.page-about .about-sec__num {
  flex: none;
  padding: 0.26rem 0.72rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-size: clamp(1.45rem, 4.8vw, 2.3rem);
  line-height: 1.32;
}

/* ---------- 01 定位 ---------- */
.page-about .about-pos {
  display: grid;
  gap: clamp(1.6rem, 4.5vw, 3rem);
}

.page-about .about-pos__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-pos__row {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.15rem;
  background: var(--ink-2);
  transition: background 0.25s var(--ease);
}

.page-about .about-pos__row:hover {
  background: var(--ink-3);
}

.page-about .about-pos__k {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan-dim);
}

.page-about .about-pos__v {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 02 内容体系 ---------- */
.page-about .about-system {
  display: grid;
  gap: clamp(1.6rem, 4.5vw, 2.8rem);
}

.page-about .about-system__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-system__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-system__media figcaption {
  padding: 0.7rem 1rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-cats {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cat {
  position: relative;
  padding: 0.95rem 1.1rem 0.95rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-2);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-cat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  bottom: 1rem;
  width: 2px;
  border-radius: var(--pill);
  background: var(--line);
  transition: background 0.25s var(--ease);
}

.page-about .about-cat:hover {
  border-color: var(--cyan-dim);
  background: var(--ink-3);
  transform: translateX(3px);
}

.page-about .about-cat:hover::before {
  background: var(--cyan);
}

.page-about .about-cat__tag {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-cat p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 03 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(0.85rem, 3vw, 1.5rem);
  padding-bottom: clamp(1.4rem, 4vw, 2.1rem);
}

.page-about .about-node:not(:last-child)::before {
  content: "";
  position: absolute;
  left: calc(1.3rem - 0.5px);
  top: 2.7rem;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-node__marker {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-node:hover .about-node__marker,
.page-about .about-node:focus-within .about-node__marker {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-node__body h3 {
  margin: 0.35rem 0 0.4rem;
  font-size: clamp(0.98rem, 2.9vw, 1.14rem);
  font-weight: 400;
  letter-spacing: 0.05em;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.6rem, 4.5vw, 2.8rem);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-md) var(--r-lg) var(--r-xl);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  opacity: 0.88;
}

.page-about .about-roles {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan-dim);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--ink-2);
  transition: border-left-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-role:hover {
  border-left-color: var(--orange);
  background: var(--ink-3);
}

.page-about .about-role__name {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-grid {
  display: grid;
  gap: clamp(0.9rem, 3vw, 1.4rem);
}

.page-about .about-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: clamp(1.1rem, 3.4vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--ink-2), var(--ink));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-card:hover {
  border-color: var(--cyan-dim);
  transform: translateY(-3px);
}

.page-about .about-card h3 {
  margin: 0;
  font-size: clamp(1rem, 2.9vw, 1.15rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 1.5;
}

.page-about .about-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 结尾路径 ---------- */
.page-about .about-next {
  padding: var(--about-pad) 0 calc(var(--about-pad) + 1rem);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(47, 230, 214, 0.09), transparent 58%),
    linear-gradient(180deg, var(--ink-2), var(--ink));
}

.page-about .about-next__inner {
  display: grid;
  gap: clamp(1.5rem, 4.5vw, 2.8rem);
}

.page-about .about-next__lead h2 {
  margin: 0.5rem 0 0.9rem;
  font-size: clamp(1.4rem, 4.6vw, 2.1rem);
  line-height: 1.35;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-role {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0.9rem;
  }
}

/* ---------- 桌面布局：左重右轻 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-hero__media {
    aspect-ratio: 4 / 5;
    margin-top: 0.6rem;
  }

  .page-about .about-pos {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(2rem, 5vw, 3.6rem);
    align-items: start;
  }

  .page-about .about-system {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(2rem, 5vw, 3.4rem);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(2rem, 5vw, 3.6rem);
    align-items: start;
  }

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

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 3.4rem);
    align-items: center;
  }

  .page-about .about-next__links {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-next__links a {
    width: 100%;
  }
}

/* ---------- 无障碍与减弱动效 ---------- */
.page-about a:focus-visible,
.page-about .about-cat:focus-within {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    transform: none !important;
  }
}
</>