/* ===== 站点介绍 · 页面专属样式（作用域：.page-about） ===== */

.page-about {
  display: block;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-3);
  line-height: 1.75;
}

.page-about .about-hero {
  position: relative;
  border-bottom: 2px solid var(--line);
  background-color: var(--bg-channel);
  background-image:
    linear-gradient(180deg, rgba(53, 224, 214, 0.07) 0%, rgba(5, 19, 31, 0) 62%),
    linear-gradient(90deg, rgba(30, 74, 102, 0.3) 1px, transparent 1px);
  background-size: 100% 100%, 88px 100%;
  padding: 28px 0 44px;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-6);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 20ch;
}

.page-about .about-lede {
  margin: 22px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--orange);
  font-family: var(--font-serif);
  font-size: var(--fs-3);
  line-height: 1.9;
  color: var(--ink);
  max-width: 44ch;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 22px 0 0;
  font-size: var(--fs-1);
  color: var(--ink-dim);
}

.page-about .about-dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cyan);
}

.page-about .about-facts {
  border: 2px solid var(--line);
  background-color: var(--bg-grid);
  box-shadow: var(--shadow-hard);
  padding: 18px 20px 20px;
}

.page-about .about-facts__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
}

.page-about .about-facts__list {
  margin: 0;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-2);
}

.page-about .about-facts__row dt {
  color: var(--ink-dim);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 通道式章节 ---------- */

.page-about .about-flow {
  padding-top: 8px;
  padding-bottom: 8px;
}

.page-about .about-section {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px 18px;
  padding: 40px 0;
  border-top: 2px solid var(--line);
  scroll-margin-top: 110px;
}

.page-about .about-section:first-child {
  border-top: 0;
}

.page-about .about-axis {
  align-self: start;
}

.page-about .about-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 2px solid var(--line);
  background-color: var(--bg-grid);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.page-about .about-num:hover,
.page-about .about-num:focus-visible {
  color: var(--bg-deep);
  background-color: var(--orange);
  border-color: var(--orange);
  outline: none;
}

.page-about .about-section:target .about-num {
  color: var(--bg-deep);
  background-color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-section:target .about-h2 {
  color: var(--orange-soft);
}

.page-about .about-body {
  min-width: 0;
  overflow-wrap: break-word;
}

.page-about .about-h2 {
  margin: 0 0 18px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-5);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-body > p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-note {
  margin: 26px 0 0;
  max-width: 44ch;
  padding: 16px 18px;
  border: 2px solid var(--line);
  border-left-width: 6px;
  border-left-color: var(--cyan);
  background-color: var(--bg-grid);
  font-size: var(--fs-2);
  line-height: 1.72;
  color: var(--ink-dim);
}

.page-about .about-note strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 图示 ---------- */

.page-about .about-figure {
  margin: 26px 0 0;
}

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

.page-about .about-figure .figure__cap {
  margin-top: 10px;
  font-size: var(--fs-1);
  line-height: 1.6;
  color: var(--ink-dim);
}

/* ---------- 栏目卡片 ---------- */

.page-about .about-cols {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-col-item {
  border: 2px solid var(--line);
  background-color: var(--bg-grid);
  padding: 16px 18px 18px;
}

.page-about .about-col-item__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-col-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-col-item p {
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--ink-dim);
}

/* ---------- 规模数字 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 24px;
  border: 2px solid var(--line);
  background-color: var(--line);
}

.page-about .about-stat {
  background-color: var(--bg-channel);
  padding: 18px 16px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--fs-4);
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-1);
  line-height: 1.5;
  color: var(--ink-dim);
}

/* ---------- 团队图文分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 4px;
}

.page-about .about-split__main > p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-split__main > p:last-child {
  margin-bottom: 0;
}

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

/* ---------- 迭代时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 26px 30px;
  border-left: 2px solid var(--line);
}

.page-about .about-tl:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--line);
  transition: background-color 160ms ease, transform 160ms ease;
}

.page-about .about-tl:hover::before,
.page-about .about-tl:focus-within::before {
  background-color: var(--orange);
  transform: scale(1.35);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-tl__title {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-3);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-2);
  line-height: 1.72;
  color: var(--ink-dim);
}

/* ---------- 末段入口 ---------- */

.page-about .about-next {
  border-top: 2px solid var(--line);
  background-color: var(--bg-deep);
  padding: 44px 0 56px;
}

.page-about .about-next__head {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-5);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-next__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__item {
  display: flex;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 4px 14px;
  width: 100%;
  padding: 18px;
  border: 2px solid var(--line);
  background-color: var(--bg-grid);
  color: var(--ink);
  text-decoration: none;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
  border-color: var(--orange);
  outline: none;
}

.page-about .about-next__no {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .about-next__desc {
  font-size: var(--fs-2);
  line-height: 1.6;
  color: var(--ink-dim);
}

/* ---------- 宽屏 ---------- */

@media (min-width: 720px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat__num {
    font-size: var(--fs-5);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 68px;
  }

  .page-about .about-section {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 24px 36px;
    padding: 68px 0;
  }

  .page-about .about-axis {
    position: sticky;
    top: 112px;
  }

  .page-about .about-num {
    width: 60px;
    height: 60px;
    font-size: var(--fs-4);
    box-shadow: var(--shadow-soft);
  }

  .page-about .about-next {
    padding: 64px 0 84px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    margin-top: 40px;
    align-items: start;
  }

  .page-about .about-hero__title {
    font-size: var(--fs-7);
  }
}

@media (min-width: 1024px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-num,
  .page-about .about-tl::before,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-tl:hover::before,
  .page-about .about-tl:focus-within::before {
    transform: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}