.page-about {
  --about-idx-w: 208px;
  --about-sec-gap: clamp(56px, 8vw, 116px);
  --about-flow-gap: clamp(32px, 5vw, 60px);
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4.5vw, 52px) 0 clamp(36px, 6vw, 84px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -25% -12% auto -12%;
  height: 135%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 68% at 80% 10%, rgba(57, 255, 136, 0.13), transparent 68%),
    radial-gradient(46% 58% at 8% 92%, rgba(255, 122, 47, 0.1), transparent 72%),
    linear-gradient(180deg, rgba(46, 111, 191, 0.06), transparent 60%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4.5vw, 52px);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2.05rem, 7vw, 4.4rem);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 15ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: clamp(1rem, 1.55vw, 1.1rem);
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-fact {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(16, 32, 58, 0.86);
}

.page-about .about-fact dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-fact dd small {
  margin-left: 4px;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--steel);
}

/* ---------- 主体：左索引 + 右内容 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-flow-gap);
  align-items: start;
}

.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--steel);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index__list .mono {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-index__list a:hover {
  color: var(--mist);
  border-color: var(--line-lime);
}

.page-about .about-index__list a[aria-current="true"] {
  color: var(--lime);
  border-color: var(--line-lime);
  background: rgba(57, 255, 136, 0.08);
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-sec-gap);
  min-width: 0;
}

/* ---------- 章节外壳 ---------- */
.page-about .about-sec {
  min-width: 0;
  scroll-margin-top: 96px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec__idx {
  flex: none;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-size: clamp(1.45rem, 4.2vw, 2.35rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-sec__lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 使用人群 ---------- */
.page-about .who-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.6vw, 22px);
}

.page-about .who-item {
  position: relative;
  padding: 20px 20px 20px 26px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(16, 32, 58, 0.55);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .who-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 3px;
  height: 22px;
  border-radius: 0 3px 3px 0;
  background: var(--lime);
}

.page-about .who-item:nth-child(even)::before {
  background: var(--orange);
}

.page-about .who-item:hover {
  border-color: var(--line-lime);
  transform: translateY(-3px);
}

.page-about .who-item h3 {
  margin: 0 0 8px;
  font-size: 1.03rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .who-item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
}

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

.page-about .about-figure figcaption {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 4px 12px;
  border-radius: var(--pill);
  background: rgba(8, 19, 32, 0.78);
  color: var(--steel);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.page-about .about-figure--team img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--side {
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-figure--side img {
  aspect-ratio: 4 / 3;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0 0 0 22px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-lime), var(--line) 60%, transparent);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3.6vw, 36px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
  box-sizing: border-box;
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.05rem, 2.6vw, 1.45rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .timeline__title {
  margin: 6px 0 8px;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 52ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .team-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .team-stat {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 32, 58, 0.6);
}

.page-about .team-stat__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .team-stat__num small {
  margin-left: 3px;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--steel);
}

.page-about .team-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .team-stat p {
  margin: 8px 0 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 38px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .team-split__title {
  margin: 0 0 14px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--mist);
}

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

.page-about .flow-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .flow-list li:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .flow-step {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .flow-list p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .eco-card {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(16, 32, 58, 0.92), rgba(8, 19, 32, 0.66));
  overflow: hidden;
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .eco-card::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 111, 191, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .eco-card:hover {
  border-color: var(--line-lime);
  transform: translateY(-3px);
}

.page-about .eco-card__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .eco-card h3 {
  margin: 12px 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
}

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

/* ---------- 荣誉 ---------- */
.page-about .honor-list {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .honor-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(16, 32, 58, 0.9), rgba(8, 19, 32, 0.6));
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .honor-item:hover {
  border-color: var(--line-lime);
  background: linear-gradient(120deg, rgba(57, 255, 136, 0.1), rgba(16, 32, 58, 0.72));
}

.page-about .honor-year {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-about .honor-body h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .honor-detail {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 更新与支持 ---------- */
.page-about .commit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .commit-card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  border-radius: var(--r-md);
  background: rgba(16, 32, 58, 0.58);
}

.page-about .commit-card__k {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--pill);
  background: rgba(255, 122, 47, 0.14);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .commit-card h3 {
  margin: 12px 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
}

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

.page-about .commit-contact {
  display: grid;
  gap: 18px;
  margin-top: clamp(24px, 4vw, 38px);
  padding: 24px 22px;
  border: 1px solid var(--line-lime);
  border-radius: var(--r-lg);
  background: radial-gradient(90% 130% at 8% 0%, rgba(57, 255, 136, 0.1), transparent 62%), rgba(16, 32, 58, 0.6);
}

.page-about .commit-contact p {
  margin: 0;
  max-width: 46ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .commit-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .who-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .commit-contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 720px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 124px minmax(0, 1fr);
    column-gap: 24px;
    align-items: start;
  }

  .page-about .timeline__year {
    grid-row: 1 / span 2;
    padding-top: 2px;
  }

  .page-about .timeline__title {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(250px, 0.9fr);
    align-items: end;
  }

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

  .page-about .team-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-figure--side {
    margin-top: 0;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .honor-detail {
    margin-top: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease), opacity 0.24s var(--ease), margin-top 0.3s var(--ease);
  }

  .page-about .honor-item:hover .honor-detail,
  .page-about .honor-item:focus-within .honor-detail {
    margin-top: 8px;
    max-height: 8rem;
    opacity: 1;
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--bbar, 72px) + 28px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__list a {
    width: 100%;
    padding: 9px 12px;
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
  }

  .page-about .about-index__list a[aria-current="true"] {
    border-color: transparent;
    border-left-color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .who-item,
  .page-about .eco-card,
  .page-about .about-index__list a,
  .page-about .honor-detail {
    transition: none;
  }

  .page-about .who-item:hover,
  .page-about .eco-card:hover {
    transform: none;
  }
}