.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  --about-line: 1px solid var(--line);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .sf-breadcrumb {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 通用非对称栏 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(34, 224, 180, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 224, 180, 0.06) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(120% 90% at 18% 0%, #000 28%, transparent 76%);
  mask-image: radial-gradient(120% 90% at 18% 0%, #000 28%, transparent 76%);
  pointer-events: none;
}

.page-about .about-hero__main {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-cond);
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 640px;
  color: var(--paper);
}

.page-about .about-hero__prose {
  margin-top: 16px;
  color: var(--mist);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--about-line);
}

.page-about .about-stat {
  background: var(--ink-deep);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-stat__n {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.page-about .about-stat__l {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero__sidecol {
  display: flex;
  gap: 14px;
  align-items: stretch;
}

.page-about .about-annot {
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--mist);
  padding-left: 10px;
  border-left: 1px solid var(--line-soft);
  white-space: nowrap;
}

.page-about .about-hero__fig {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
}

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

/* ---------- 章节标题统一节奏 ---------- */
.page-about .sf-h2 {
  margin: 12px 0 16px;
  font-family: var(--font-cond);
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .sf-h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--paper);
}

/* ---------- 02 我们做什么 ---------- */
.page-about .about-do__title {
  max-width: 12em;
}

.page-about .about-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
  transition: border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-color: var(--mint);
  padding-left: 10px;
}

.page-about .about-step__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--warm);
}

.page-about .about-step__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 03 数据新鲜度 ---------- */
.page-about .about-fresh__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-fresh__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-fresh__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--mint);
}

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

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

/* ---------- 04 联赛覆盖 ---------- */
.page-about .about-league__head {
  max-width: 760px;
}

.page-about .about-league__lead {
  color: var(--mist);
}

.page-about .about-leaguemap {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-leaguemap__item {
  background: var(--ink-deep);
  border: 1px solid var(--line);
  border-left: 3px solid var(--wine);
  padding: 18px 18px 20px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-leaguemap__item:nth-child(2) {
  border-left-color: var(--mint);
}

.page-about .about-leaguemap__item:nth-child(3) {
  border-left-color: var(--indigo);
}

.page-about .about-leaguemap__item:nth-child(4) {
  border-left-color: var(--gold);
}

.page-about .about-leaguemap__item:hover,
.page-about .about-leaguemap__item:focus-within {
  background: var(--panel);
  border-color: var(--mint);
}

.page-about .about-leaguemap__tag {
  display: inline-block;
  margin-bottom: 12px;
}

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

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

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

/* ---------- 05 版本迭代 ---------- */
.page-about .about-history__head {
  max-width: 760px;
}

.page-about .about-history__lead {
  color: var(--mist);
}

.page-about .about-timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-tl {
  position: relative;
  padding: 24px 20px 24px 0;
  border-top: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-tl:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--mist);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tl:hover,
.page-about .about-tl:focus-within {
  border-color: var(--mint);
  background: rgba(21, 31, 51, 0.6);
}

.page-about .about-tl:hover::before,
.page-about .about-tl:focus-within::before {
  background: var(--mint);
  border-color: var(--mint);
}

.page-about .about-tl__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
  margin-bottom: 10px;
}

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

.page-about .about-history__note {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-history__note a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 180, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-history__note a:hover,
.page-about .about-history__note a:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

/* ---------- 06 谁在用 ---------- */
.page-about .about-userslist {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-user {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 20px 24px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-user:hover,
.page-about .about-user:focus-within {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-user__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--warm);
  margin-bottom: 12px;
}

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

/* ---------- 07 做事方式 ---------- */
.page-about .about-principlist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-principle:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-principle__n {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.page-about .about-principle__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- CTA ---------- */
.page-about .about-cta__box {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, var(--indigo) 0%, var(--ink-deep) 58%, var(--ink) 100%);
  padding: clamp(26px, 4vw, 52px);
}

.page-about .about-cta__box::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(34, 224, 180, 0.22);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about .about-cta__title {
  margin-top: 12px;
}

.page-about .about-cta__lead {
  max-width: 620px;
  color: var(--paper);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-step {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

  .page-about .about-step__k {
    padding-top: 4px;
  }

  .page-about .about-leaguemap {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-cols {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-cols__a {
    grid-column: span 7;
  }

  .page-about .about-cols__b {
    grid-column: span 5;
  }

  .page-about .about-cols--aside .about-cols__a {
    grid-column: span 4;
  }

  .page-about .about-cols--aside .about-cols__b {
    grid-column: span 8;
  }

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

  .page-about .about-tl {
    border-bottom: 1px solid var(--line);
    padding: 26px 22px 28px 0;
  }

  .page-about .about-tl + .about-tl {
    padding-left: 22px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-tl + .about-tl::before {
    left: 21px;
  }

  .page-about .about-userslist {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-user:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-user:nth-child(3) {
    margin-top: 60px;
  }

  .page-about .about-hero__side {
    padding-top: 46px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-leaguemap {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-do__aside {
    padding-right: 24px;
  }

  .page-about .about-principle {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
  }
}

@media (max-width: 719px) {
  .page-about .about-hero__sidecol {
    flex-direction: column;
  }

  .page-about .about-annot {
    writing-mode: horizontal-tb;
    letter-spacing: 0.2em;
    padding-left: 0;
    padding-top: 10px;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .page-about .about-cta__box::after {
    display: none;
  }
}
<<<END>>>