.page-about {
  background: var(--kb-night);
  color: var(--kb-chalk);
}

.page-about .kb-crumbs {
  margin-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(42px, 7.5vw, 92px) 0 clamp(32px, 5vw, 60px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(112deg, transparent 0 54%, rgba(56, 242, 208, .07) 54% 55.1%, transparent 55.1%),
    linear-gradient(112deg, transparent 0 63%, rgba(56, 242, 208, .045) 63% 63.9%, transparent 63.9%),
    repeating-linear-gradient(90deg, rgba(232, 237, 242, .05) 0 1px, transparent 1px 112px);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__kicker {
  font-family: var(--kb-ui);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--kb-cyan);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  font-family: var(--kb-serif);
  font-weight: 900;
  font-size: clamp(30px, 5.8vw, 62px);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--kb-chalk);
  margin: 0 0 22px;
  max-width: 15em;
}

.page-about .about-hero__lede {
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: rgba(232, 237, 242, .76);
  max-width: 42em;
  margin: 0;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--kb-hair);
  display: flex;
  flex-wrap: wrap;
  gap: 20px 46px;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-family: var(--kb-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--kb-cyan);
}

.page-about .about-hero__unit {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--kb-gray);
}

/* ---------- 主体框架：左目录 + 右长文 ---------- */
.page-about .about-stage {
  position: relative;
  padding-bottom: clamp(36px, 5vw, 80px);
}

.page-about .about-toc {
  border-top: 1px solid var(--kb-hair);
  padding-top: 16px;
  margin-bottom: 32px;
}

.page-about .about-toc__label {
  font-family: var(--kb-ui);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--kb-gray);
  margin: 0 0 14px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-toc__link {
  display: block;
  font-family: var(--kb-ui);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--kb-chalk);
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid var(--kb-line);
  background: rgba(18, 41, 61, .62);
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--kb-night);
  background: var(--kb-cyan);
  border-color: var(--kb-cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-top: clamp(34px, 4.6vw, 60px);
  border-top: 1px solid var(--kb-hair);
  scroll-margin-top: calc(var(--kb-header-h) + 24px);
}

.page-about .about-sec:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-sec__title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: var(--kb-ui);
  font-size: clamp(22px, 3.1vw, 33px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--kb-chalk);
  margin: 0 0 20px;
}

.page-about .about-sec__idx {
  font-family: var(--kb-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--kb-cyan);
}

.page-about .about-sec__lede {
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(232, 237, 242, .74);
  max-width: 40em;
  margin: 0 0 26px;
}

.page-about .about-prose p {
  font-size: 16px;
  line-height: 1.88;
  color: rgba(232, 237, 242, .78);
  margin: 0 0 18px;
  max-width: 41em;
}

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

.page-about .about-pull {
  margin: 28px 0 0;
  padding: 18px 0 18px 22px;
  border-left: 2px solid var(--kb-cyan);
  font-size: clamp(16px, 2.1vw, 21px);
  line-height: 1.62;
  color: var(--kb-chalk);
  max-width: 32em;
}

/* ---------- 图片 ---------- */
.page-about .kb-figure {
  margin: 30px 0;
}

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

.page-about .kb-figure__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--kb-gray);
  max-width: 46em;
}

/* ---------- 三段路 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-flow__step {
  padding: 24px 22px 26px;
  background: var(--kb-deep);
  border: 1px solid var(--kb-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--kb-cut)), calc(100% - var(--kb-cut)) 100%, 0 100%);
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--kb-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--kb-cyan);
  margin-bottom: 14px;
}

.page-about .about-flow__title {
  font-family: var(--kb-ui);
  font-size: 17px;
  font-weight: 900;
  color: var(--kb-chalk);
  margin: 0 0 10px;
}

.page-about .about-flow__step p {
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(232, 237, 242, .72);
  margin: 0;
}

/* ---------- 赛季时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-tl__node {
  position: relative;
  padding-left: 30px;
}

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(56, 242, 208, .8) 0%, rgba(56, 242, 208, .06) 100%);
}

.page-about .about-tl__node:last-child::before {
  display: none;
}

.page-about .about-tl__node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  background: var(--kb-cyan);
}

.page-about .about-tl__node:nth-child(1) { padding-bottom: 52px; }
.page-about .about-tl__node:nth-child(2) { padding-bottom: 44px; }
.page-about .about-tl__node:nth-child(3) { padding-bottom: 36px; }
.page-about .about-tl__node:nth-child(4) { padding-bottom: 28px; }
.page-about .about-tl__node:nth-child(5) { padding-bottom: 0; }

.page-about .about-tl__season {
  display: inline-block;
  font-family: var(--kb-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--kb-night);
  background: var(--kb-cyan);
  padding: 5px 10px;
  margin-bottom: 12px;
}

.page-about .about-tl__title {
  font-family: var(--kb-ui);
  font-size: 17.5px;
  font-weight: 900;
  color: var(--kb-chalk);
  margin: 0 0 8px;
}

.page-about .about-tl__body > p {
  font-size: 15px;
  line-height: 1.82;
  color: rgba(232, 237, 242, .72);
  margin: 0;
  max-width: 40em;
}

.page-about .about-tl__more {
  display: grid;
  grid-template-rows: 1fr;
  opacity: 1;
  transition: grid-template-rows .3s ease, opacity .3s ease;
}

.page-about .about-tl__more > div {
  overflow: hidden;
}

.page-about .about-tl__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.page-about .about-tl__list li {
  font-size: 12px;
  letter-spacing: .04em;
  color: #9CCBA8;
  background: rgba(79, 122, 90, .18);
  border: 1px solid rgba(79, 122, 90, .45);
  padding: 4px 10px;
}

/* ---------- 四个小组 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-team {
  padding: 22px 20px 24px;
  background: rgba(18, 41, 61, .68);
  border-left: 2px solid var(--kb-cyan);
}

.page-about .about-team:nth-child(2) { border-left-color: var(--kb-orange); }
.page-about .about-team:nth-child(3) { border-left-color: var(--kb-moss); }
.page-about .about-team:nth-child(4) { border-left-color: var(--kb-clay); }

.page-about .about-team h3 {
  font-family: var(--kb-ui);
  font-size: 17px;
  font-weight: 900;
  color: var(--kb-chalk);
  margin: 0 0 10px;
}

.page-about .about-team p {
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(232, 237, 242, .72);
  margin: 0 0 12px;
}

.page-about .about-team .about-team__meta {
  font-family: var(--kb-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--kb-gray);
  margin: 0;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-reach__figures {
  display: grid;
  gap: 18px;
}

.page-about .about-reach__fig {
  padding-top: 14px;
  border-top: 1px solid var(--kb-hair);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--kb-mono);
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--kb-cyan);
  margin-bottom: 9px;
}

.page-about .about-reach__label {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(232, 237, 242, .74);
}

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

/* ---------- 我们看重什么 ---------- */
.page-about .about-standards {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-standard {
  padding: 24px 22px 26px;
  background: var(--kb-paper);
  color: var(--kb-night);
  clip-path: polygon(0 0, calc(100% - var(--kb-cut)) 0, 100% var(--kb-cut), 100% 100%, 0 100%);
}

.page-about .about-standard__k {
  display: block;
  font-family: var(--kb-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--kb-clay);
  margin-bottom: 12px;
}

.page-about .about-standard h3 {
  font-family: var(--kb-ui);
  font-size: 18px;
  font-weight: 900;
  color: var(--kb-night);
  margin: 0 0 10px;
}

.page-about .about-standard p {
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(11, 27, 43, .78);
  margin: 0;
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .about-partner {
  padding-top: 18px;
  border-top: 2px solid var(--kb-line);
}

.page-about .about-partner h3 {
  font-family: var(--kb-ui);
  font-size: 17px;
  font-weight: 900;
  color: var(--kb-chalk);
  margin: 0 0 10px;
}

.page-about .about-partner p {
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(232, 237, 242, .74);
  margin: 0;
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  margin-top: clamp(40px, 5.5vw, 72px);
  padding-top: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--kb-hair);
}

.page-about .about-next__title {
  font-family: var(--kb-ui);
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 900;
  color: var(--kb-chalk);
  margin: 0 0 22px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 20px;
  border: 1px solid var(--kb-line);
  background: rgba(18, 41, 61, .55);
  text-decoration: none;
  transition: border-color .16s ease, background-color .16s ease, transform .16s ease;
}

.page-about .about-next__link span {
  font-family: var(--kb-ui);
  font-size: 16px;
  font-weight: 900;
  color: var(--kb-chalk);
}

.page-about .about-next__link em {
  font-style: normal;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--kb-gray);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--kb-cyan);
  background: rgba(56, 242, 208, .07);
  transform: translateX(3px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-reach {
    grid-template-columns: 1fr 1.05fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-standards {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-method__figure {
    margin: 34px 0 38px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-stage {
    padding-left: 224px;
  }

  .page-about .about-toc {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 176px;
    margin: 0;
    padding: 0 0 0 16px;
    border-top: none;
    border-left: 1px solid var(--kb-hair);
  }

  .page-about .about-toc__inner {
    position: sticky;
    top: calc(var(--kb-header-h) + 28px);
  }

  .page-about .about-toc__list {
    display: block;
  }

  .page-about .about-toc__item + .about-toc__item {
    margin-top: 2px;
  }

  .page-about .about-toc__link {
    position: relative;
    border: none;
    background: none;
    padding: 9px 8px 9px 14px;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--kb-gray);
  }

  .page-about .about-toc__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 4px;
    height: 4px;
    transform: translateY(-50%) rotate(45deg);
    background: var(--kb-track);
    transition: background-color .16s ease, box-shadow .16s ease;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    color: var(--kb-chalk);
    background: rgba(56, 242, 208, .08);
  }

  .page-about .about-toc__link:hover::before,
  .page-about .about-toc__link:focus-visible::before {
    background: var(--kb-cyan);
    box-shadow: 0 0 10px rgba(56, 242, 208, .6);
  }
}

@media (hover: hover) and (pointer: fine) and (min-width: 900px) {
  .page-about .about-tl__more {
    grid-template-rows: 0fr;
    opacity: 0;
  }

  .page-about .about-tl__node:hover .about-tl__more,
  .page-about .about-tl__node:focus-within .about-tl__more {
    grid-template-rows: 1fr;
    opacity: 1;
  }
}

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

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