.page-about {
  --about-rail-w: 208px;
  --about-maxw: 1080px;
  background: var(--yb-ink);
  color: var(--yb-body);
}

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

/* ---------- 面包屑 ---------- */
.page-about .yb-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: var(--yb-container);
  margin-inline: auto;
  padding: calc(var(--yb-header-h) + 18px) var(--yb-gutter) 0;
  font-size: 13px;
  color: var(--yb-muted);
}

.page-about .yb-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .yb-breadcrumb__item + .yb-breadcrumb__item::before {
  content: "/";
  color: var(--yb-line);
}

.page-about .yb-breadcrumb__link {
  color: var(--yb-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .yb-breadcrumb__link:hover,
.page-about .yb-breadcrumb__link:focus-visible {
  color: var(--yb-cyan);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin: clamp(20px, 3vw, 36px) var(--yb-gutter) 0;
  padding: clamp(30px, 4.5vw, 60px) clamp(20px, 4vw, 64px) clamp(30px, 4.5vw, 56px);
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius-lg);
  background:
    radial-gradient(120% 100% at 92% 2%, rgba(122, 92, 255, 0.24), transparent 58%),
    radial-gradient(100% 90% at 2% 100%, rgba(53, 240, 208, 0.14), transparent 62%),
    var(--yb-panel);
  overflow: hidden;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--about-maxw);
  margin-inline: auto;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 7.2vw, 82px);
  line-height: 1.06;
  letter-spacing: -0.015em;
}

.page-about .about-hero__lede {
  margin-top: 24px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--yb-body);
}

.page-about .about-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__mark {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-hero__mark {
    position: absolute;
    right: clamp(24px, 4vw, 60px);
    bottom: clamp(22px, 3.5vw, 44px);
    z-index: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    pointer-events: none;
  }

  .page-about .about-hero__mark-num {
    font-size: clamp(64px, 9vw, 124px);
    font-weight: 700;
    line-height: 0.86;
    letter-spacing: 0.02em;
    color: transparent;
    -webkit-text-stroke: 1px rgba(53, 240, 208, 0.45);
  }

  .page-about .about-hero__mark-label {
    margin-top: 10px;
    font-size: 12px;
    letter-spacing: 0.28em;
    color: var(--yb-muted);
  }
}

/* ---------- 全宽数据带 ---------- */
.page-about .about-band {
  background: var(--yb-steel);
  border-block: 1px solid var(--yb-line);
}

.page-about .about-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--yb-line);
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
  overflow: hidden;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 18px;
  background: var(--yb-steel);
}

.page-about .about-band__val {
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--yb-cyan);
  letter-spacing: 0.01em;
}

.page-about .about-band__unit {
  margin-left: 2px;
  font-size: 0.5em;
  vertical-align: 0.35em;
  font-family: var(--yb-font-sans);
  font-weight: 500;
  color: var(--yb-body);
}

.page-about .about-band__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--yb-muted);
}

@media (min-width: 640px) {
  .page-about .about-band__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-band__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-band__item {
    padding: 26px 20px;
  }
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 4vw, 64px);
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-rail__title {
  margin: 0 0 14px;
}

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

.page-about .about-rail__index .yb-index__link {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-pill);
  font-size: 13.5px;
  color: var(--yb-muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-rail__index .yb-index__link:hover,
.page-about .about-rail__index .yb-index__link:focus-visible {
  color: var(--yb-text);
  border-color: rgba(53, 240, 208, 0.5);
}

.page-about .about-rail__index .yb-index__link[aria-current="true"] {
  color: var(--yb-cyan);
  border-color: rgba(53, 240, 208, 0.55);
  background: rgba(53, 240, 208, 0.1);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--yb-header-h) + 28px);
    align-self: start;
  }

  .page-about .about-rail__index .yb-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    border-left: 1px solid var(--yb-line);
  }

  .page-about .about-rail__index .yb-index__link {
    margin-left: -1px;
    padding: 9px 14px;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0 var(--yb-pill) var(--yb-pill) 0;
    background: none;
  }

  .page-about .about-rail__index .yb-index__link:hover,
  .page-about .about-rail__index .yb-index__link:focus-visible {
    background: rgba(232, 236, 246, 0.04);
  }

  .page-about .about-rail__index .yb-index__link[aria-current="true"] {
    border-left-color: var(--yb-cyan);
    background: linear-gradient(90deg, rgba(53, 240, 208, 0.16), transparent);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-block: clamp(36px, 5.5vw, 68px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid rgba(43, 58, 99, 0.55);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
}

.page-about .about-h2 {
  margin: 12px 0 20px;
  font-size: clamp(25px, 3.5vw, 42px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--yb-text);
  max-width: 20em;
}

.page-about .about-h2 + .yb-prose {
  margin-top: 0;
}

.page-about .about-body .yb-prose {
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.9;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--yb-cyan), rgba(122, 92, 255, 0.55), rgba(43, 58, 99, 0));
}

.page-about .about-tl {
  position: relative;
  padding: 16px 0 20px 40px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--yb-cyan);
  background: var(--yb-ink);
  box-shadow: var(--yb-glow-cyan);
}

.page-about .about-tl__year {
  display: block;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--yb-cyan);
}

.page-about .about-tl__title {
  margin: 4px 0 8px;
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--yb-text);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--yb-body);
  max-width: 34em;
}

@media (min-width: 640px) {
  .page-about .about-tl {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 0 22px;
    padding-left: 44px;
  }

  .page-about .about-tl__year {
    text-align: right;
    padding-top: 2px;
  }
}

.page-about .about-side {
  margin: 32px 0 0;
  max-width: 380px;
}

.page-about .about-side img {
  width: 100%;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
}

.page-about .about-side figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--yb-muted);
}

/* ---------- 分部体系 ---------- */
.page-about .about-squads__media {
  margin: 30px 0 0;
}

.page-about .about-squads {
  display: grid;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--yb-line);
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
  overflow: hidden;
}

.page-about .about-squad {
  position: relative;
  padding: 26px 20px 24px;
  background: var(--yb-steel);
  transition: background 0.25s ease;
}

.page-about .about-squad::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--yb-cyan), rgba(122, 92, 255, 0.6), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.page-about .about-squad:hover,
.page-about .about-squad:focus-within {
  background: var(--yb-panel);
}

.page-about .about-squad:hover::before,
.page-about .about-squad:focus-within::before {
  opacity: 1;
}

.page-about .about-squad__num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--yb-muted);
}

.page-about .about-squad__name {
  margin: 12px 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--yb-text);
}

.page-about .about-squad__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--yb-body);
}

.page-about .about-squad__meta {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--yb-cyan);
}

.page-about .about-squads__note {
  margin-top: 26px;
}

@media (min-width: 640px) {
  .page-about .about-squads {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-squads {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-squad {
    padding: 28px 18px 26px;
  }
}

/* ---------- 内容与数据 ---------- */
.page-about .about-ops {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-op {
  padding: 26px 22px;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
  background: linear-gradient(180deg, rgba(22, 33, 61, 0.92), rgba(13, 21, 38, 0.92));
}

.page-about .about-op__num {
  margin: 0;
  font-size: clamp(34px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--yb-cyan);
}

.page-about .about-op h3 {
  margin: 14px 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--yb-text);
}

.page-about .about-op p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--yb-body);
}

.page-about .about-output {
  display: grid;
  gap: 18px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-output li {
  display: grid;
  gap: 8px;
}

.page-about .about-output__label {
  font-size: 14px;
  color: var(--yb-text);
}

.page-about .about-output__bar {
  display: block;
  height: 6px;
  border-radius: var(--yb-pill);
  background: var(--yb-steel);
  overflow: hidden;
}

.page-about .about-output__bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--yb-purple), var(--yb-cyan));
}

.page-about .about-output li:nth-child(1) .about-output__bar i { width: 100%; }
.page-about .about-output li:nth-child(2) .about-output__bar i { width: 46%; }
.page-about .about-output li:nth-child(3) .about-output__bar i { width: 28%; }

.page-about .about-output__val {
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--yb-muted);
}

@media (min-width: 720px) {
  .page-about .about-output li {
    grid-template-columns: 138px minmax(0, 1fr) 148px;
    align-items: center;
    gap: 20px;
  }

  .page-about .about-output__val {
    text-align: right;
  }
}

@media (min-width: 860px) {
  .page-about .about-ops {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 赛区网络 ---------- */
.page-about .about-net {
  display: grid;
  gap: 34px;
  align-items: center;
  margin-top: 32px;
}

.page-about .about-orbit {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin-inline: auto;
}

.page-about .about-net__list {
  display: grid;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-net__item {
  padding-left: 18px;
  border-left: 2px solid var(--yb-line);
}

.page-about .about-net__item:nth-child(1) { border-left-color: var(--yb-cyan); }
.page-about .about-net__item:nth-child(2) { border-left-color: var(--yb-purple); }
.page-about .about-net__item:nth-child(3) { border-left-color: var(--yb-orange); }

.page-about .about-net__item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--yb-text);
}

.page-about .about-net__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--yb-body);
}

@media (min-width: 900px) {
  .page-about .about-net {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .about-orbit {
    max-width: 340px;
  }
}

/* ---------- 行业认可 ---------- */
.page-about .about-honors {
  display: grid;
  gap: 18px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honor {
  padding: 28px 24px;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
  background: var(--yb-panel);
}

.page-about .about-honor__year {
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--yb-cyan);
}

.page-about .about-honor h3 {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--yb-text);
}

.page-about .about-honor p {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--yb-body);
}

.page-about .about-honor-banner {
  margin: 32px 0 0;
}

.page-about .about-honor-banner img {
  width: 100%;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius-lg);
}

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

/* ---------- 做事方式 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 22px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principles li {
  padding-top: 22px;
  border-top: 1px solid var(--yb-line);
}

.page-about .about-principles__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.26em;
  color: var(--yb-cyan);
}

.page-about .about-principles h3 {
  margin: 12px 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--yb-text);
}

.page-about .about-principles p {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--yb-body);
}

@media (min-width: 900px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-principles li {
    padding-top: 24px;
  }
}

/* ---------- 行动收束 ---------- */
.page-about .about-cta {
  position: relative;
  margin: clamp(8px, 2vw, 20px) var(--yb-gutter) clamp(52px, 7vw, 96px);
  padding: clamp(36px, 5vw, 68px) clamp(22px, 4vw, 60px);
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius-lg);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(53, 240, 208, 0.18), transparent 58%),
    radial-gradient(80% 120% at 0% 100%, rgba(255, 138, 43, 0.12), transparent 60%),
    var(--yb-steel);
  overflow: hidden;
}

.page-about .about-cta__inner {
  max-width: 860px;
  margin-inline: auto;
  text-align: center;
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.5vw, 40px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--yb-text);
}

.page-about .about-cta p {
  margin: 0 auto;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--yb-body);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}