/* ===== 我们是谁｜页面专属样式（作用域 .page-about） ===== */

.page-about .about-topbar {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 40px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 460px;
  background:
    radial-gradient(58% 96% at 22% 0%, rgba(47, 227, 208, 0.16), transparent 70%),
    radial-gradient(48% 84% at 84% 8%, rgba(255, 138, 61, 0.10), transparent 72%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}
.page-about .about-hero__text h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: 34px;
  color: var(--ink);
}
.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .hero-fact {
  background: var(--bg-deep);
  padding: 16px 16px 18px;
}
.page-about .hero-fact dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .hero-fact dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}
.page-about .hero-fact dd .num {
  font-size: 30px;
}
.page-about .hero-fact dd i {
  font-style: normal;
  font-size: 13px;
  color: var(--amber);
}

/* ---------- 章节骨架：左固定编号 + 右滚动正文 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-block: 28px 0;
}

.page-about .chapters {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}
.page-about .chapters__title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-family: var(--font-num);
}
.page-about .chapters__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .chapters__item {
  flex: 0 0 auto;
}
.page-about .chapters__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(14, 31, 58, 0.5);
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color 0.16s ease, color 0.16s ease, background-color 0.16s ease;
}
.page-about .chapters__link:hover,
.page-about .chapters__link:focus-visible {
  border-color: var(--cyan);
  color: var(--ink);
  background: rgba(47, 227, 208, 0.07);
}
.page-about .chapters__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .chapters-body {
  min-width: 0;
}

/* ---------- 单个章节 ---------- */
.page-about .chapter {
  padding: 40px 0 8px;
  border-top: 1px solid var(--line);
  transition: border-color 0.3s ease;
}
.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 8px;
}
.page-about .chapter.is-lit {
  border-top-color: rgba(47, 227, 208, 0.45);
}
.page-about .chapter__head {
  margin-bottom: 18px;
}
.page-about .chapter__num {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}
.page-about .chapter__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.16;
  font-size: 26px;
  color: var(--ink);
}
.page-about .chapter__inner {
  min-width: 0;
}
.page-about .chapter--narrow .chapter__inner {
  max-width: 68ch;
}

/* ---------- 数据条 ---------- */
.page-about .stat-strip {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .stat-strip__item {
  background: var(--bg-mid);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .stat-strip__value {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
}
.page-about .stat-strip__unit {
  font-size: 12px;
  margin-left: 3px;
  color: var(--cyan-soft);
}
.page-about .stat-strip__label {
  font-size: 12px;
  color: var(--muted);
}

/* ---------- 团队分工：7:5 组合 ---------- */
.page-about .about-bento {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.page-about .donut-wrap {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px 16px;
}
.page-about .donut {
  width: 100%;
  max-width: 232px;
  height: auto;
}
.page-about .donut__track {
  fill: none;
  stroke: var(--line);
  stroke-width: 26;
}
.page-about .donut__seg {
  fill: none;
  stroke-width: 26;
  transition: stroke-width 0.18s ease;
}
.page-about .donut__seg--dc { stroke: var(--cyan); }
.page-about .donut__seg--pt { stroke: var(--orange); }
.page-about .donut__seg--op { stroke: var(--muted); }
.page-about .donut__seg:hover { stroke-width: 34; }
.page-about .donut__total {
  text-anchor: middle;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 40px;
  fill: var(--ink);
}
.page-about .donut__total-label {
  text-anchor: middle;
  font-size: 12px;
  fill: var(--muted);
}
.page-about .donut__caption {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}
.page-about .tick-list__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .tick-list__text b {
  color: var(--ink);
  font-weight: 700;
}
.page-about .about-bento__note {
  margin-top: 20px;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .partner-split__figure {
  margin: 0;
}
.page-about .partner-tags {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .partner-tags__item {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-indigo);
  color: var(--cyan-soft);
  font-size: 13px;
  transition: border-color 0.16s ease, color 0.16s ease;
}
.page-about .partner-tags__item:hover {
  border-color: var(--cyan);
  color: var(--ink);
}

/* ---------- 版本刻度轨 ---------- */
.page-about .vtrack {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}
.page-about .vnode {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(14, 31, 58, 0.55);
  transition: border-color 0.16s ease;
}
.page-about .vnode:hover,
.page-about .vnode[open],
.page-about .vnode.is-lit {
  border-color: var(--cyan);
}
.page-about .vnode__summary {
  list-style: none;
  cursor: pointer;
  padding: 13px 15px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .vnode__summary::-webkit-details-marker {
  display: none;
}
.page-about .vnode__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}
.page-about .vnode__heading {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .vnode__body {
  padding: 0 15px 14px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}
.page-about .vnode__body p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .vtrack__foot {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: 56px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(27, 31, 75, 0.55), rgba(10, 18, 36, 0));
}
.page-about .about-cta__inner {
  padding-block: 44px 54px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}
.page-about .about-cta__text h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  font-size: 24px;
  line-height: 1.2;
  color: var(--ink);
}
.page-about .about-cta__text p {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 链接与焦点 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 4px;
}
.page-about .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 208, 0.4);
}
.page-about .prose a:hover {
  border-bottom-color: var(--cyan);
}
.page-about .vtrack__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 208, 0.4);
}
.page-about .vtrack__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 46px 0 54px;
  }
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }
  .page-about .about-hero__text h1 {
    font-size: 52px;
  }
  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    padding-block: 48px 0;
  }
  .page-about .chapters {
    position: sticky;
    top: 92px;
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
  }
  .page-about .chapters__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .chapters__link {
    width: 100%;
    padding: 10px 12px;
  }

  .page-about .chapter {
    padding: 52px 0 10px;
  }
  .page-about .chapter__title {
    font-size: 34px;
  }
  .page-about .chapter--narrow .chapter__inner {
    max-width: 72ch;
  }

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

  .page-about .about-bento {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 18px;
    align-items: stretch;
  }

  .page-about .partner-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .vtrack {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    position: relative;
    padding-top: 22px;
  }
  .page-about .vtrack::before {
    content: "";
    position: absolute;
    left: 8px;
    right: 8px;
    top: 10px;
    height: 1px;
    background: linear-gradient(90deg, var(--line), var(--cyan), var(--line));
    opacity: 0.55;
  }
  .page-about .vtrack__item {
    position: relative;
  }
  .page-about .vtrack__item::before {
    content: "";
    position: absolute;
    left: 14px;
    top: -16px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--bg-deep);
    border: 1px solid var(--cyan);
  }

  .page-about .about-cta {
    margin-top: 72px;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding-block: 56px 64px;
  }
  .page-about .about-cta__text h2 {
    font-size: 30px;
  }
  .page-about .about-cta__actions {
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapters__link,
  .page-about .donut__seg,
  .page-about .vnode,
  .page-about .partner-tags__item,
  .page-about .chapter {
    transition: none;
  }
  .page-about .donut__seg:hover {
    stroke-width: 26;
  }
}