.page-about {
  --ab-line: rgba(16, 24, 32, 0.16);
  --ab-line-soft: rgba(16, 24, 32, 0.08);
  --ab-on-dark: rgba(220, 235, 247, 0.72);
  position: relative;
  color: var(--deep);
  background:
    radial-gradient(120% 55% at 100% 0%, rgba(31, 111, 178, 0.12), transparent 62%),
    radial-gradient(90% 40% at 0% 18%, rgba(77, 224, 208, 0.07), transparent 60%),
    var(--paper);
}

.page-about .container {
  max-width: 1180px;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(18px, 3vw, 30px) clamp(34px, 5vw, 68px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .ab-hero h1 {
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 9vw, 5.4rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  color: var(--deep);
}

.page-about .ab-hero h1 .ab-hero__sub {
  display: block;
  margin-top: 0.34em;
  font-size: clamp(1.05rem, 3.4vw, 1.6rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--deepblue);
  border-left: 4px solid var(--orange);
  padding-left: 0.7em;
}

.page-about .ab-hero .lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 60ch;
  color: #23303c;
}

.page-about .ab-hero__figure {
  margin: 0;
  width: 100%;
  max-width: 420px;
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 1px solid var(--ab-line);
  box-shadow: 14px 16px 0 -4px rgba(31, 111, 178, 0.18);
}

/* 数字条 */
.page-about .ab-facts {
  list-style: none;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ab-line);
  border-left: 1px solid var(--ab-line);
}

.page-about .ab-facts li {
  padding: 14px 14px 16px;
  border-right: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--blue);
}

.page-about .ab-facts__label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--gray);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-section {
  padding-block: clamp(38px, 6vw, 82px);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-section__head {
  max-width: 66ch;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .ab-section__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.55rem);
  line-height: 1.12;
  letter-spacing: -0.022em;
  color: var(--deep);
}

.page-about .ab-section__intro {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: #3b4a57;
}

.page-about .ab-split {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
}

.page-about .ab-note {
  padding: clamp(18px, 2.4vw, 26px);
  border-top: 3px solid var(--orange);
}

.page-about .ab-note__text {
  margin: 14px 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: #2b3945;
}

/* ---------- 四条内容线 ---------- */
.page-about .ab-system {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .ab-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-line {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2.4vw, 26px);
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-line__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .ab-line__body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .ab-line__body p {
  margin: 10px 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: #3b4a57;
}

.page-about .ab-line__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 111, 178, 0.4);
  padding-bottom: 2px;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .ab-line__link:hover,
.page-about .ab-line__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .ab-system__figure {
  margin: 0;
}

.page-about .ab-system__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-line);
}

.page-about .ab-system__figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 团队 ---------- */
.page-about .ab-roles {
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-role {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 26px);
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
  outline: none;
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-visible {
  background: var(--ice);
  transform: translateY(-2px);
}

.page-about .ab-role__count {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--deepblue);
}

.page-about .ab-role__count::after {
  content: " 人";
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .ab-role h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--deep);
}

.page-about .ab-role p {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: #3b4a57;
}

/* ---------- 赛季节奏 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--blue), rgba(31, 111, 178, 0.14));
}

.page-about .ab-tl {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 40px;
  scroll-margin-top: 90px;
}

.page-about .ab-tl:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 4px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--blue);
}

.page-about .ab-tl--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(244, 123, 32, 0.18);
}

.page-about .ab-tl__when {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-tl h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .ab-tl p {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: #3b4a57;
}

.page-about .ab-tl .ab-line__link {
  margin-top: 10px;
}

.page-about .ab-aside {
  align-self: start;
  border: 1px dashed var(--ab-line);
  background: rgba(220, 235, 247, 0.42);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .ab-aside__label {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-index a {
  display: block;
  padding: 9px 10px;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--deepblue);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  background: rgba(255, 255, 255, 0.8);
  border-left-color: var(--orange);
  color: var(--deep);
}

.page-about .ab-aside__meter {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-aside__meter-k {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-aside__meter-v {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--deepblue);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-map {
  margin: 0 0 clamp(22px, 3vw, 34px);
}

.page-about .ab-map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-line);
}

.page-about .ab-map figcaption {
  margin-top: 12px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--gray);
  max-width: 60ch;
}

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

.page-about .ab-stats li {
  background: var(--paper);
  padding: clamp(14px, 2vw, 20px);
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.2vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--deepblue);
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 为什么 ---------- */
.page-about .ab-section--why {
  border-top: 0;
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(77, 224, 208, 0.16), transparent 60%),
    linear-gradient(158deg, #0B1220 0%, #0E3A5C 100%);
  color: var(--paper);
}

.page-about .ab-section--why .eyebrow {
  color: var(--cyan);
}

.page-about .ab-section--why h2 {
  color: var(--paper);
}

.page-about .ab-why {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .ab-why__item {
  padding-top: 16px;
  border-top: 1px solid rgba(220, 235, 247, 0.22);
}

.page-about .ab-why__k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .ab-why__item h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.6vw, 1.35rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-why__item p {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ab-on-dark);
}

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid rgba(220, 235, 247, 0.22);
}

.page-about .ab-cta__link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 224, 208, 0.45);
  padding-bottom: 2px;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.7fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .ab-hero__figure {
    justify-self: end;
    margin-top: 8px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .ab-system {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .ab-system__figure {
    position: sticky;
    top: 28px;
  }

  .page-about .ab-line {
    grid-template-columns: auto minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-line__link,
  .page-about .ab-index a,
  .page-about .ab-cta__link {
    transition: none;
  }

  .page-about .ab-role:hover,
  .page-about .ab-role:focus-visible {
    transform: none;
  }
}
<<<END>>>