/* ===== 我们是谁 · 页面专属样式 ===== */

.page-about {
  padding-bottom: calc(var(--step) * 3);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: calc(var(--header-h) + 28px) 0 calc(var(--step) * 2);
  border-bottom: 1px solid var(--edge);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: calc(var(--step) * 1.6);
}

.page-about .about-hero-grid {
  display: grid;
  gap: calc(var(--step) * 1.25);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--green);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 9vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero h1 span {
  color: var(--green);
}

.page-about .about-lede {
  margin: 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero-aside {
  display: flex;
  gap: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--edge);
}

.page-about .about-side-note {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-aside-text {
  margin: 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: calc(var(--step) * 2) 0 0;
  padding: 0;
  list-style: none;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .about-stats li {
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 7vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 页内目录 ---------- */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(7, 11, 10, 0.94);
  border-bottom: 1px solid var(--edge);
  backdrop-filter: blur(10px);
}

.page-about .about-toc-list {
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--green);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: calc(var(--step) * 2.5) 0;
  border-bottom: 1px solid var(--edge);
  scroll-margin-top: 84px;
}

.page-about .about-grid {
  display: grid;
  gap: var(--step);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(38px, 11vw, 64px);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--green);
}

.page-about .about-rail-note {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .about-body > h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-body > p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 阶段阶梯 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 12px;
  margin: var(--step) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--ink-800);
  border-left: 2px solid var(--green);
}

.page-about .about-step-tag {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-desk-grid {
  display: grid;
  gap: var(--step);
  margin-top: var(--step);
}

.page-about .about-roster {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--edge);
}

.page-about .about-roster li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-roster-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-roster h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-roster p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-desk-figure {
  margin: 0;
}

/* ---------- 栏目卡片 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: var(--step);
}

.page-about .about-col {
  padding: 18px 20px 20px;
}

.page-about .about-col-idx {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green);
}

.page-about .about-col h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-afternote {
  margin: var(--step) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据链路 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 14px;
  margin: 0 0 var(--step);
  padding: 0;
  list-style: none;
}

.page-about .about-flow li {
  padding: 16px 18px 18px;
  background: var(--ink-800);
  border: 1px solid var(--edge);
  border-top: 2px solid var(--green);
}

.page-about .about-flow-num {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-flow h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-source-figure {
  margin: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-figure {
  margin: 0 0 var(--step);
}

.page-about .about-tl {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--edge);
}

.page-about .about-tl-node {
  position: relative;
  padding: 0 0 26px;
  margin-left: -22px;
  padding-left: 22px;
}

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

.page-about .about-tl-node::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--green);
  transform: rotate(45deg);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-tl-node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 227, 200, 0.18);
}

.page-about .about-tl-year {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-tl-node h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
  transition: color 200ms var(--ease);
}

.page-about .about-tl-node:hover h3 {
  color: var(--green);
}

.page-about .about-tl-node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 联系 ---------- */
.page-about .about-section--talk {
  border-bottom: 0;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: var(--step) 0 20px;
}

.page-about .about-note {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--edge);
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

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

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

/* ---------- 中屏 ---------- */
@media (min-width: 40rem) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

/* ---------- 宽屏 ---------- */
@media (min-width: 60rem) {
  .page-about .about-toc {
    top: var(--header-h);
  }

  .page-about .about-section {
    scroll-margin-top: calc(var(--header-h) + 72px);
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.7fr);
    gap: calc(var(--step) * 3);
    align-items: end;
  }

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

  .page-about .about-grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: calc(var(--step) * 2);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 76px);
  }

  .page-about .about-rail-note {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
  }

  .page-about .about-desk-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .about-tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
    padding: var(--step) 0 0;
    border-left: 0;
    border-top: 1px solid var(--edge);
  }

  .page-about .about-tl-node,
  .page-about .about-tl-node:last-child {
    margin-left: 0;
    padding: 22px 14px 0 0;
  }

  .page-about .about-tl-node::before {
    left: 0;
    top: -4.5px;
  }
}

@media (min-width: 68rem) {
  .page-about .about-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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