.page-about {
  --about-rule: rgba(243, 233, 214, .16);
  --about-hard: 10px 10px 0 rgba(0, 0, 0, .45);
  --about-pad: clamp(20px, 5vw, 96px);
}

.page-about .about-crumb {
  padding: 20px var(--about-pad) 4px;
}

.page-about .about-crumb .breadcrumb {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--stone);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--lime);
  text-decoration: none;
}

.page-about .about-crumb .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 8px var(--about-pad) 58px;
  background:
    radial-gradient(900px 380px at 88% -12%, rgba(184, 255, 60, .11), transparent 68%),
    radial-gradient(720px 340px at 2% 6%, rgba(56, 207, 255, .09), transparent 70%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: end;
    gap: 48px;
  }
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lime);
  border: 1px solid rgba(184, 255, 60, .35);
  border-radius: 2px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(38px, 10vw, 90px);
  font-weight: 900;
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--cream);
}

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

.page-about .about-hero__lede {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(16px, 2.4vw, 19px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--iron);
  box-shadow: var(--about-hard);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  padding: 12px 15px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  border-top: 1px solid var(--about-rule);
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding: 52px var(--about-pad) 58px;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  align-items: baseline;
  padding-top: 18px;
  border-top: 3px solid var(--brick);
  margin-bottom: 28px;
}

.page-about .about-chapter__num {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--brick);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(26px, 5.4vw, 44px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-chapter__body {
  max-width: 72ch;
}

.page-about .about-p {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-p--after {
  margin-top: 32px;
  padding-left: 16px;
  border-left: 3px solid var(--lime);
  color: var(--cream);
}

/* ---------- 数字行 ---------- */

.page-about .about-figs {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
}

@media (min-width: 760px) {
  .page-about .about-figs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .about-figs li {
  padding-top: 14px;
  border-top: 2px solid rgba(184, 255, 60, .45);
}

.page-about .about-figs__num {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .about-figs__unit {
  margin-left: 3px;
  font-size: 14px;
  color: var(--lime);
}

.page-about .about-figs__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 停顿带 ---------- */

.page-about .about-breath {
  margin: 0;
  padding: 40px var(--about-pad);
  background: linear-gradient(90deg, rgba(192, 67, 43, .18), rgba(26, 21, 18, .9) 58%, rgba(10, 12, 10, 1));
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-breath p {
  margin: 0;
  max-width: 26ch;
  font-size: clamp(19px, 4.2vw, 26px);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--cream);
}

/* ---------- 时间线 ---------- */

.page-about .about-tl {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-left: 2px solid var(--about-rule);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 38px 26px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(184, 255, 60, .12);
}

.page-about .about-tl__year {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--brick);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-tl__media {
  margin: 4px 0 10px;
  max-width: 560px;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--iron);
}

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

.page-about .about-tl__media figcaption {
  padding: 11px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  border-top: 1px solid var(--about-rule);
}

/* ---------- 分工树 ---------- */

.page-about .about-tree {
  margin-top: 32px;
}

.page-about .about-tree__root {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 20px;
  border: 2px solid var(--lime);
  border-radius: var(--radius);
  background: rgba(184, 255, 60, .07);
}

.page-about .about-tree__count {
  font-size: clamp(34px, 8vw, 54px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--lime);
}

.page-about .about-tree__unit {
  font-size: 15px;
  color: var(--cream);
}

.page-about .about-tree__branches {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 26px 0 0;
  display: grid;
  gap: 16px;
}

.page-about .about-tree__branches::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brick), rgba(192, 67, 43, 0) 92%);
}

@media (min-width: 820px) {
  .page-about .about-tree__branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-tree__branch {
  padding: 18px 18px 20px;
  background: var(--iron);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--blue);
  border-radius: 4px;
  transition: transform .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-tree__branch:hover,
.page-about .about-tree__branch:focus-within {
  transform: translateY(-4px);
  border-top-color: var(--lime);
  background: #221b17;
}

.page-about .about-tree__num {
  display: block;
  margin-bottom: 8px;
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--blue);
}

.page-about .about-tree__role {
  margin: 0 0 9px;
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-tree__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 比赛节奏 ---------- */

.page-about .about-flow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-flow__step {
  padding: 14px 14px 16px;
  border-left: 2px solid var(--blue);
  background: linear-gradient(180deg, rgba(56, 207, 255, .08), transparent 72%);
}

.page-about .about-flow__time {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--blue);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 数据章节 ---------- */

.page-about .about-data {
  display: grid;
  gap: 30px;
  max-width: none;
}

@media (min-width: 880px) {
  .page-about .about-data {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 44px;
    align-items: start;
  }
}

.page-about .about-data__body {
  max-width: 62ch;
}

.page-about .about-data__figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
  box-shadow: var(--about-hard);
}

.page-about .about-data__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-data__figure figcaption {
  padding: 12px 15px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--stone);
  border-top: 1px solid var(--about-rule);
}

/* ---------- 社区数字块 ---------- */

.page-about .about-comm {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
}

.page-about .about-comm li {
  padding: 18px 18px 20px;
  border: 1px solid rgba(255, 106, 43, .32);
  border-radius: 4px;
  background: linear-gradient(150deg, rgba(255, 106, 43, .12), transparent 68%);
}

.page-about .about-comm__num {
  font-size: clamp(32px, 5vw, 42px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .about-comm__unit {
  margin-left: 4px;
  font-size: 14px;
  color: var(--orange);
}

.page-about .about-comm__label {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 接下来 ---------- */

.page-about .about-next {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 820px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next__card {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--iron);
  border: 1px solid var(--about-rule);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-next__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--lime), var(--blue));
}

.page-about .about-next__card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */

.page-about .about-outro {
  padding: 54px var(--about-pad) 72px;
  border-top: 3px solid var(--brick);
  background:
    radial-gradient(680px 300px at 6% 0%, rgba(255, 106, 43, .10), transparent 70%);
}

.page-about .about-outro__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 4.6vw, 38px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-outro__text {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

@media (max-width: 719px) {
  .page-about .about-hero__figure,
  .page-about .about-data__figure {
    box-shadow: 5px 5px 0 rgba(0, 0, 0, .45);
  }

  .page-about .about-breath p {
    max-width: none;
  }
}