.page-about {
  --about-rail: 172px;
  --about-gap: clamp(28px, 4vw, 56px);
  display: block;
  background: var(--c-night);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 48px) 0 clamp(32px, 6vw, 76px);
  background:
    radial-gradient(120% 96% at 82% 0%, rgba(46, 125, 98, .34), transparent 62%),
    linear-gradient(180deg, var(--c-night-deep) 0%, var(--c-night) 76%);
  border-bottom: 3px solid var(--c-clay);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-hero__eyebrow {
  color: var(--c-orange);
  margin: 0 0 10px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.2vw, 64px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__side {
  display: grid;
  gap: 14px;
  align-content: end;
}

.page-about .about-slip {
  display: grid;
  gap: 4px;
  padding: 16px 18px 18px;
  background: var(--c-deep);
  border-left: 8px solid var(--c-meadow);
  box-shadow: var(--shadow-brut);
}

.page-about .about-slip--orange {
  border-left-color: var(--c-orange);
}

.page-about .about-slip__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ink-3);
}

.page-about .about-slip__val {
  font-family: var(--font-head);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.15;
  color: var(--c-yellow);
}

.page-about .about-slip__note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-2);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }
}

/* ---------- 规模条 ---------- */
.page-about .about-tally {
  background: var(--c-deep);
  border-bottom: 3px solid var(--c-night-deep);
}

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

.page-about .about-tally__item {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 26px) clamp(14px, 2vw, 22px);
  background: var(--c-deep);
}

.page-about .about-tally__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5.6vw, 56px);
  font-weight: 800;
  line-height: 1;
  color: var(--c-yellow);
}

.page-about .about-tally__unit {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-orange);
}

.page-about .about-tally__label {
  flex-basis: 100%;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-2);
}

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

/* ---------- 长卷骨架 ---------- */
.page-about .about-longform {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  padding: clamp(30px, 5vw, 72px) 0 clamp(46px, 7vw, 96px);
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--line);
  background: rgba(20, 55, 94, .5);
  text-decoration: none;
  color: var(--ink-2);
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--c-meadow);
  color: var(--ink);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  color: var(--c-yellow);
}

.page-about .about-rail__name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

@media (min-width: 960px) {
  .page-about .about-longform {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 18px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    display: grid;
    gap: 4px;
    padding: 0 0 0 14px;
    border: 0;
    border-left: 3px solid transparent;
    background: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-meadow);
  }

  .page-about .about-rail__num {
    font-size: clamp(34px, 3.4vw, 46px);
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1.6px var(--c-clay);
  }

  .page-about .about-rail__name {
    font-size: 12px;
    letter-spacing: .06em;
    color: var(--ink-3);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  padding-bottom: clamp(30px, 4.6vw, 60px);
}

.page-about .about-chapter__eyebrow {
  margin: 0 0 12px;
  color: var(--c-meadow);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-chapter__lede {
  margin: clamp(14px, 1.8vw, 20px) 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-chapter__body {
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-points {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-point {
  padding-left: 18px;
  border-left: 4px solid var(--c-meadow);
}

.page-about .about-point__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.7vw, 20px);
  font-weight: 800;
  color: var(--c-yellow);
}

.page-about .about-point p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-points--compact {
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 840px) {
  .page-about .about-points--compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }
}

/* 章节色带 */
.page-about .about-rule {
  height: 8px;
  margin: clamp(20px, 3.4vw, 44px) 0 clamp(28px, 4.4vw, 56px);
  background: linear-gradient(90deg,
    var(--c-meadow) 0 25%,
    var(--c-orange) 25% 50%,
    var(--c-vermilion) 50% 75%,
    var(--c-yellow) 75% 100%);
  box-shadow: var(--shadow-lift);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 40px) 0 0;
  border: 3px solid var(--line);
  background: var(--c-night-deep);
  box-shadow: var(--shadow-brut);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--ink-3);
  border-top: 2px solid var(--c-night-deep);
}

.page-about .about-figure--team {
  margin-top: clamp(26px, 3.6vw, 44px);
}

/* ---------- 赛事网络 ---------- */
.page-about .about-net {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-net .about-points {
  gap: 20px;
}

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

@media (min-width: 880px) {
  .page-about .about-net {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .tl-node {
  border-left: 6px solid var(--c-meadow);
  background: var(--c-deep);
  box-shadow: var(--shadow-lift);
}

.page-about .tl-node[open] {
  border-left-color: var(--c-vermilion);
}

.page-about .tl-node__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-node__summary:focus-visible {
  outline: 2px solid var(--c-yellow);
  outline-offset: -4px;
}

.page-about .tl-node__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(17px, 1.9vw, 22px);
  font-weight: 800;
  color: var(--c-yellow);
}

.page-about .tl-node__title {
  font-family: var(--font-head);
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl-node__sign {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .tl-node__sign::before {
  content: "+";
}

.page-about .tl-node[open] .tl-node__sign::before {
  content: "−";
}

.page-about .tl-node__panel {
  padding: 0 18px 18px;
  border-top: 2px solid rgba(244, 240, 231, .12);
  padding-top: 14px;
}

.page-about .tl-node__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-chapter--team {
  padding-top: clamp(28px, 4.6vw, 60px);
  border-top: 3px solid var(--c-night-deep);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-role {
  padding: 18px 18px 20px;
  background: var(--c-deep);
  border: 3px solid var(--line);
  border-left-width: 8px;
  box-shadow: var(--shadow-lift);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.page-about .about-role--plan {
  border-left-color: var(--c-meadow);
}

.page-about .about-role--data {
  border-left-color: var(--c-ice);
}

.page-about .about-role--fans {
  border-left-color: var(--c-orange);
}

.page-about .about-role--service {
  border-left-color: var(--c-clay);
}

.page-about .about-role:hover {
  transform: translateY(-2px);
  border-color: var(--c-yellow);
  box-shadow: var(--shadow-brut);
}

.page-about .about-role__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.7vw, 20px);
  font-weight: 800;
  color: var(--c-yellow);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 为什么选择我们 ---------- */
.page-about .about-proof {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(22px, 3.2vw, 38px);
}

.page-about .about-proof__card {
  padding: 22px 20px 24px;
  background: linear-gradient(160deg, var(--c-deep) 0%, var(--c-night-deep) 100%);
  border: 3px solid var(--c-clay);
  box-shadow: var(--shadow-brut);
}

.page-about .about-proof__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(42px, 6vw, 68px);
  font-weight: 800;
  line-height: 1;
  color: var(--c-yellow);
  letter-spacing: -0.02em;
}

.page-about .about-proof__unit {
  margin-left: 6px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-orange);
  letter-spacing: 0;
}

.page-about .about-proof__title {
  margin: 14px 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.7vw, 20px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-proof__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

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

.page-about .about-cta {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 3.6vw, 44px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--c-deep-lift);
  border: 3px solid var(--c-orange);
  box-shadow: var(--shadow-brut);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}