.page-about {
  --about-pad: clamp(60px, 9vw, 120px);
  --about-card-bg: rgba(18, 63, 56, .72);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--about-pad) + 46px) 0 var(--about-pad);
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(56, 242, 200, .14), transparent 60%),
    linear-gradient(180deg, #071e1b 0%, var(--ink) 58%, #0a2b26 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(58deg, rgba(201, 207, 201, .05) 0 1px, transparent 1px 5px);
  opacity: .8;
}

.page-about .about-hero .crumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__frame {
  position: relative;
  z-index: 1;
  padding: clamp(26px, 4.6vw, 56px);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(18, 63, 56, .78), rgba(11, 46, 41, .34));
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 900px;
  font-size: clamp(30px, 6.4vw, 68px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 640px;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--paper-70);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 14px;
  margin: 36px 0 0;
  padding: 24px 0 0;
  border-top: 1px dashed var(--line);
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  color: var(--orange);
  letter-spacing: .02em;
}

.page-about .about-hero__unit {
  font-size: 13px;
  line-height: 1.5;
  color: var(--paper-70);
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-index {
  position: relative;
  z-index: 2;
  background: rgba(7, 30, 27, .96);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .chapter-index__inner {
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .chapter-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 13px 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .chapter-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border: 1px solid transparent;
  border-bottom-color: var(--line);
  color: var(--paper-70);
  font-size: 13px;
  text-decoration: none;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .chapter-index__link:hover,
.page-about .chapter-index__link:focus-visible,
.page-about .chapter-index__link[aria-current="true"] {
  color: var(--neon);
  border-color: var(--line-strong);
  background: rgba(56, 242, 200, .08);
}

.page-about .chapter-index__no {
  font-size: 11px;
  color: var(--gold);
}

.page-about .chapter-index__link[aria-current="true"] .chapter-index__no {
  color: var(--neon);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-ch {
  position: relative;
  padding: var(--about-pad) 0;
  color: var(--paper);
}

.page-about .about-ch__grid {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
  align-items: start;
}

.page-about .about-ch__body {
  min-width: 0;
}

.page-about .chapter-no {
  margin: 0 0 14px;
  font-size: clamp(26px, 4.6vw, 46px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .chapter-no::after {
  content: "";
  display: inline-block;
  width: clamp(44px, 12vw, 120px);
  height: 1px;
  margin-left: 14px;
  vertical-align: middle;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .chapter-kicker {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
  text-transform: uppercase;
}

.page-about .chapter-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: inherit;
}

.page-about .chapter-lede {
  margin: 14px 0 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--neon-soft);
}

.page-about .about-text {
  margin: 24px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--paper-70);
}

.page-about .about-text a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-text a:hover {
  color: var(--neon-soft);
}

.page-about .about-text--dim {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  color: var(--gray);
}

/* ---------- 条目列表 ---------- */
.page-about .about-list {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid rgba(56, 242, 200, .14);
  font-size: 15px;
  line-height: 1.76;
  color: var(--paper-70);
}

.page-about .about-list li a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-list__k {
  flex: 0 0 auto;
  min-width: 3.4em;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .about-list--legacy li {
  border-bottom-color: rgba(255, 209, 102, .24);
}

.page-about .about-list--legacy .about-list__k {
  color: var(--gold);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-about .about-figure .media__caption {
  padding: 10px 14px;
  font-size: 12px;
  color: var(--paper-70);
  background: rgba(7, 30, 27, .8);
}

/* ---------- 各章背景带 ---------- */
.page-about .about-ch--do {
  background:
    radial-gradient(90% 70% at 88% 4%, rgba(56, 242, 200, .09), transparent 62%),
    var(--ink);
}

.page-about .about-ch--squad {
  background: linear-gradient(180deg, #221f52 0%, var(--indigo) 100%);
}

.page-about .about-ch--sub {
  background:
    linear-gradient(180deg, var(--ink-2) 0%, #0d332d 100%);
}

.page-about .about-ch--screens {
  background:
    radial-gradient(80% 60% at 12% 100%, rgba(56, 242, 200, .09), transparent 66%),
    #0a2925;
}

.page-about .about-ch--legacy {
  background: linear-gradient(180deg, #641a33 0%, var(--wine) 100%);
}

.page-about .about-ch--family {
  background: linear-gradient(200deg, var(--indigo) 0%, #1f1b4d 100%);
}

.page-about .about-ch--team {
  background: var(--paper);
  color: var(--graphite);
}

.page-about .about-ch--partners {
  background: linear-gradient(180deg, var(--ink) 0%, #071e1b 100%);
}

/* ---------- 球队库筛选示意图 ---------- */
.page-about .about-squad__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-squad__dims {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-squad__dims li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid rgba(168, 255, 240, .16);
  font-size: 15px;
  line-height: 1.74;
  color: var(--paper-70);
}

.page-about .about-squad__dim {
  flex: 0 0 auto;
  min-width: 4.6em;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .about-squad__diagram {
  margin: 0;
  padding: clamp(16px, 3vw, 28px);
  border: 1px solid var(--line);
  background: rgba(11, 46, 41, .34);
}

.page-about .dims-svg {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto;
  color: rgba(168, 255, 240, .38);
}

.page-about .dims-svg__core {
  fill: rgba(56, 242, 200, .14);
  stroke: var(--neon);
  stroke-width: 1;
}

.page-about .dims-svg__core-label {
  fill: var(--paper);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
}

.page-about .dims-svg__core-sub {
  fill: var(--neon-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-anchor: middle;
}

.page-about .dims-svg__node {
  cursor: pointer;
  outline: none;
}

.page-about .dims-svg__node circle {
  fill: var(--neon);
  transform-box: fill-box;
  transform-origin: center;
  transition: transform .25s var(--ease), fill .25s var(--ease);
}

.page-about .dims-svg__node text {
  fill: var(--neon-soft);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-anchor: middle;
}

.page-about .dims-svg__node:hover circle,
.page-about .dims-svg__node:focus-visible circle {
  transform: scale(1.55);
  fill: var(--orange);
}

.page-about .dims-svg__node:hover text,
.page-about .dims-svg__node:focus-visible text {
  fill: var(--orange);
}

.page-about .about-squad__cap {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gray);
  text-align: center;
}

/* ---------- 订阅四步 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 12px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 24px 20px;
  border: 1px solid var(--line);
  background: var(--about-card-bg);
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 2px;
  background: transparent;
  transition: background .25s var(--ease);
}

.page-about .about-steps__item:hover {
  border-color: var(--line-strong);
  background: rgba(24, 82, 72, .86);
}

.page-about .about-steps__item:hover::before {
  background: var(--neon);
}

.page-about .about-steps__no {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

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

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--paper-70);
}

.page-about .about-steps__item p a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 多端一节 ---------- */
.page-about .about-screens__figure {
  margin: clamp(32px, 5vw, 54px) 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-about .about-screens__figure .media__caption {
  padding: 10px 14px;
  font-size: 12px;
  color: var(--paper-70);
  background: rgba(7, 30, 27, .8);
}

.page-about .about-screens__notes {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-note {
  min-width: 0;
  padding-top: 18px;
  border-top: 2px solid var(--line-strong);
}

.page-about .about-note h3 {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .about-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--paper-70);
}

/* ---------- 内容团队 ---------- */
.page-about .about-ch--team .chapter-kicker {
  color: var(--wine);
}

.page-about .about-ch--team .chapter-no {
  color: var(--wine);
}

.page-about .about-ch--team .chapter-no::after {
  background: linear-gradient(90deg, var(--wine), transparent);
}

.page-about .about-ch--team .chapter-lede {
  color: var(--gray);
}

.page-about .about-ch--team .about-text {
  color: rgba(27, 31, 30, .8);
}

.page-about .about-ch--team .about-text a {
  color: var(--wine);
}

.page-about .about-ch--team .about-text--dim {
  color: var(--gray);
  border-top-color: var(--line-ink);
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-top: 34px;
}

.page-about .about-team__card {
  padding: 26px 22px;
  background: #fbf9f3;
  border: 1px solid var(--line-ink);
  color: var(--graphite);
}

.page-about .about-team__tag {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--wine);
}

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

.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(27, 31, 30, .78);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  margin-top: 34px;
}

.page-about .about-partners__col {
  padding: 26px 22px;
  background: var(--about-card-bg);
  border: 1px solid var(--line);
  transition: border-color .25s var(--ease);
}

.page-about .about-partners__col:hover {
  border-color: var(--line-strong);
}

.page-about .about-partners__tag {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
}

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

.page-about .about-partners__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-70);
}

.page-about .about-partners__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 38px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (min-width: 900px) {
  .page-about .about-ch__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .92fr);
  }

  .page-about .about-ch__grid--flip {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.35fr);
  }

  .page-about .about-squad__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::after {
    opacity: .35;
  }

  .page-about .dims-svg__node circle {
    transition: none;
  }
}