.page-about {
  --ab-hair: rgba(44, 74, 64, .55);
  --ab-shadow: rgba(6, 18, 16, .85);
  --ab-lime-glow: rgba(200, 255, 61, .22);
  --ab-track: rgba(11, 31, 26, .14);
  --ab-paper-line: rgba(11, 31, 26, .14);
  background: var(--ink);
  color: var(--cold);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: .05em;
  line-height: 1.1;
  margin: 0;
}

.page-about .ab-body {
  font-size: .97rem;
  line-height: 1.78;
  color: var(--mist);
  margin: 0 0 1em;
  max-width: 38ch;
}

.page-about .ab-body--tight {
  margin-bottom: .6em;
}

.page-about .ab-body--center {
  max-width: 56ch;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* ---------- 首屏框景 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(96px, 15vw, 172px) var(--pad) clamp(48px, 6vw, 80px);
  background: var(--ink);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ab-hair) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-hair) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: .5;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 8%, transparent 82%);
  mask-image: linear-gradient(to bottom, #000 8%, transparent 82%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 78% 8%, rgba(200, 255, 61, .09), transparent 62%);
  pointer-events: none;
}

.page-about .ab-hero-frame {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  border: 2px solid var(--line);
  padding: clamp(22px, 3.6vw, 52px);
  background: rgba(11, 31, 26, .82);
  box-shadow: 10px 10px 0 var(--ab-shadow);
}

.page-about .ab-hero-frame::before,
.page-about .ab-hero-frame::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid var(--lime);
  pointer-events: none;
}

.page-about .ab-hero-frame::before {
  top: -2px;
  left: -2px;
  border-right: none;
  border-bottom: none;
}

.page-about .ab-hero-frame::after {
  right: -2px;
  bottom: -2px;
  border-left: none;
  border-top: none;
}

.page-about .ab-hero .eyebrow {
  color: var(--lime);
  margin-bottom: 14px;
}

.page-about .ab-hero h1 {
  font-size: clamp(2rem, 5.6vw, 3.8rem);
  font-weight: 700;
  text-transform: uppercase;
  margin: .1em 0 .5em;
  max-width: 20ch;
}

.page-about .ab-hero .lede {
  max-width: 44ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--cold);
  opacity: .88;
  margin: 0;
}

.page-about .ab-hero-facts {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .ab-hero-facts li {
  background: var(--ink);
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .ab-fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-fact-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

/* ---------- 四条内容线 ---------- */

.page-about .ab-lines-section {
  background: var(--ink);
  padding: clamp(48px, 7vw, 96px) var(--pad);
}

.page-about .ab-lines-grid {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 60px);
  align-items: start;
}

.page-about .ab-lines-media h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  margin: 0 0 .5em;
}

.page-about .ab-figure,
.page-about .ab-rhythm-figure,
.page-about .ab-source-figure {
  margin: 0 0 clamp(20px, 2.8vw, 32px);
  overflow: hidden;
}

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

.page-about .ab-line-card {
  position: relative;
  background: var(--deep);
  border: 2px solid var(--line);
  border-left: 4px solid var(--lime);
  padding: clamp(20px, 2.4vw, 28px);
  box-shadow: 6px 6px 0 var(--ab-shadow);
  transition: transform .24s ease, box-shadow .24s ease, border-left-color .24s ease;
}

.page-about .ab-line-card + .ab-line-card {
  margin-top: clamp(16px, 2vw, 22px);
}

.page-about .ab-line-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 10px 10px 0 var(--ab-lime-glow);
  border-left-color: var(--amber);
}

.page-about .ab-line-num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
  border: 1px solid var(--amber);
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .ab-line-card h3 {
  font-size: 1.2rem;
  color: var(--cold);
  margin-bottom: 10px;
}

.page-about .ab-line-card p {
  margin: 0 0 14px;
  font-size: .93rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-line-link {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-lime-glow);
  padding-bottom: 3px;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .ab-line-link:hover,
.page-about .ab-line-link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 赛季节奏 ---------- */

.page-about .ab-rhythm-section {
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(52px, 7.5vw, 104px) var(--pad);
}

.page-about .ab-rhythm-section .eyebrow {
  color: var(--paper-mist);
}

.page-about .ab-rhythm-section .ab-body {
  color: var(--paper-mist);
}

.page-about .ab-rhythm-grid {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 5vw, 68px);
  align-items: start;
}

.page-about .ab-rhythm-intro h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  color: var(--paper-ink);
  margin: 0 0 .5em;
}

.page-about .ab-rhythm-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-rhythm-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 34px;
  width: 2px;
  background: linear-gradient(to bottom, var(--lime-dim), var(--amber) 62%, var(--review));
}

.page-about .ab-rhythm-node {
  position: relative;
  padding: 0 0 clamp(26px, 3.4vw, 42px) clamp(32px, 4vw, 48px);
}

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

.page-about .ab-rhythm-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--amber);
  box-shadow: 0 0 0 3px var(--paper);
  transition: background .22s ease, transform .22s ease;
}

.page-about .ab-rhythm-node:hover::before {
  background: var(--amber);
  transform: scale(1.18);
}

.page-about .ab-node-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--review);
  margin-bottom: 8px;
}

.page-about .ab-rhythm-node h3 {
  font-size: 1.12rem;
  color: var(--paper-ink);
  margin: 0 0 8px;
}

.page-about .ab-rhythm-node p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.72;
  color: var(--paper-mist);
  max-width: 46ch;
}

/* ---------- 数据来源 ---------- */

.page-about .ab-source-section {
  background: var(--deep);
  padding: clamp(52px, 7.5vw, 104px) var(--pad);
  position: relative;
  overflow: hidden;
}

.page-about .ab-source-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ab-hair) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-hair) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: .32;
  pointer-events: none;
}

.page-about .ab-source-grid {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 60px);
  align-items: start;
}

.page-about .ab-source-copy h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  margin: 0 0 .5em;
}

.page-about .ab-source-copy .eyebrow {
  color: var(--lime);
}

.page-about .ab-source-facts {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .ab-source-facts > div {
  background: var(--ink);
  padding: 16px 18px;
}

.page-about .ab-source-facts dt {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 6px;
}

.page-about .ab-source-facts dd {
  margin: 0;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-source-figure {
  margin-bottom: 0;
  border: 2px solid var(--line);
}

.page-about .ab-source-figure figcaption {
  background: var(--ink);
  border-top: 2px solid var(--line);
  padding: 12px 16px;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 维护标准 ---------- */

.page-about .ab-standard-section {
  background: var(--ink);
  padding: clamp(52px, 7.5vw, 104px) var(--pad);
}

.page-about .ab-standard-section > h2 {
  max-width: var(--shell);
  margin: 0 auto .6em;
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  text-align: center;
}

.page-about .ab-standard-grid {
  list-style: none;
  max-width: var(--shell);
  margin: clamp(32px, 4.5vw, 56px) auto 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2vw, 22px);
}

.page-about .ab-standard-cell {
  background: var(--deep);
  border: 2px solid var(--line);
  border-top: 3px solid var(--lime-dim);
  padding: clamp(20px, 2.4vw, 28px);
  box-shadow: 5px 5px 0 var(--ab-shadow);
}

.page-about .ab-standard-cell .micro {
  display: block;
  color: var(--lime-dim);
  margin-bottom: 12px;
}

.page-about .ab-standard-cell h3 {
  font-size: 1.08rem;
  color: var(--cold);
  margin: 0 0 10px;
}

.page-about .ab-standard-cell p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 观赛场景 ---------- */

.page-about .ab-scenes-section {
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(52px, 7.5vw, 104px) var(--pad);
}

.page-about .ab-scenes-section > h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  color: var(--paper-ink);
  text-align: center;
  margin: 0 0 .6em;
}

.page-about .ab-scenes-section .ab-body {
  color: var(--paper-mist);
}

.page-about .ab-scenes-grid {
  max-width: var(--shell);
  margin: clamp(32px, 4.5vw, 56px) auto 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2vw, 22px);
}

.page-about .ab-scene {
  position: relative;
  background: var(--paper);
  border: 2px solid var(--paper-ink);
  padding: clamp(22px, 2.6vw, 30px);
  box-shadow: 7px 7px 0 rgba(11, 31, 26, .16);
  transition: transform .24s ease, box-shadow .24s ease;
}

.page-about .ab-scene:hover {
  transform: translate(-3px, -3px);
  box-shadow: 11px 11px 0 rgba(255, 122, 47, .3);
}

.page-about .ab-scene-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--paper-ink);
  color: var(--lime);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 14px;
}

.page-about .ab-scene h3 {
  font-size: 1.12rem;
  color: var(--paper-ink);
  margin: 0 0 10px;
}

.page-about .ab-scene p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--paper-mist);
}

/* ---------- 合作入口 ---------- */

.page-about .ab-join-section {
  background: var(--deep);
  padding: clamp(56px, 8vw, 112px) var(--pad);
}

.page-about .ab-join-inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 64px);
  align-items: start;
  border: 2px solid var(--line);
  padding: clamp(24px, 3.6vw, 48px);
  background: rgba(11, 31, 26, .72);
  box-shadow: 10px 10px 0 var(--ab-shadow);
}

.page-about .ab-join-copy .eyebrow {
  color: var(--amber);
}

.page-about .ab-join-copy h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  margin: 0 0 .5em;
}

.page-about .ab-join-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 clamp(20px, 2.6vw, 28px);
}

.page-about .ab-join-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .ab-join-list li {
  display: grid;
  gap: 4px;
  background: var(--ink);
  padding: 14px 16px;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-join-key {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--lime);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .ab-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-lines-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .ab-lines-media {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-rhythm-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .ab-rhythm-intro {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-source-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .ab-join-inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 1180px) {
  .page-about .ab-lines-grid {
    gap: clamp(48px, 5vw, 80px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-line-card,
  .page-about .ab-scene,
  .page-about .ab-rhythm-node::before {
    transition: none;
  }

  .page-about .ab-line-card:hover,
  .page-about .ab-scene:hover {
    transform: none;
  }

  .page-about .ab-rhythm-node:hover::before {
    transform: none;
  }
}