.page-about {
  --ab-grid-line: rgba(46, 92, 78, 0.14);
  --ab-row-shift: 8px;
  position: relative;
}

/* —— 底部极淡球场网格纹理 —— */
.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--ab-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-grid-line) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.55;
  z-index: 0;
}

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

/* —— 首屏 —— */
.page-about .ab-hero {
  padding-block: clamp(28px, 5vw, 64px) clamp(36px, 6vw, 80px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-hero-grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .ab-hero-title {
  font-size: clamp(30px, 6vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  font-weight: 900;
}

.page-about .ab-hero .lede {
  margin-top: 20px;
}

.page-about .ab-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .ab-hero-side {
  border-left: 1px solid var(--line);
  padding-left: 20px;
  background: linear-gradient(180deg, var(--turf) 0%, transparent 70%);
}

.page-about .ab-side-title {
  font-family: var(--font-en);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
  margin: 0 0 12px;
}

.page-about .ab-timeline {
  display: block;
  width: 100%;
  max-width: 130px;
  height: auto;
}

.page-about .ab-side-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-jump {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 1px solid var(--line-hair);
  color: var(--ivory);
  text-decoration: none;
  font-size: var(--fs-14);
  transition: border-color 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .ab-jump:hover,
.page-about .ab-jump:focus-visible {
  border-left-color: var(--cyan);
  color: var(--cyan);
  transform: translateX(4px);
  outline: none;
}

/* —— 起点 —— */
.page-about .ab-origin-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: 1fr;
}

.page-about .ab-origin-text p + p {
  margin-top: 16px;
}

.page-about .ab-quote {
  margin-top: 28px;
  padding: 20px 22px;
  border-left: 3px solid var(--cyan);
  background: var(--cyan-wash);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
}

.page-about .ab-quote .num-figure {
  font-size: clamp(34px, 7vw, 72px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-origin-media {
  margin: 0;
}

/* —— 拆分方式 —— */
.page-about .ab-slices {
  background: linear-gradient(180deg, var(--turf-deep) 0%, transparent 100%);
}

.page-about .ab-slice-band {
  margin-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--line);
}

.page-about .ab-slice-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 22px 16px 22px 18px;
  border-bottom: 1px solid var(--line-hair);
  border-left: 1px solid transparent;
  position: relative;
  transition: background 200ms var(--ease), border-left-color 200ms var(--ease);
}

.page-about .ab-slice-row::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--cyan);
  transition: width 200ms var(--ease);
}

.page-about .ab-slice-row:hover,
.page-about .ab-slice-row:focus-within,
.page-about .ab-slice-row:focus-visible {
  background: var(--cyan-wash);
  outline: none;
}

.page-about .ab-slice-row:hover::after,
.page-about .ab-slice-row:focus-within::after {
  width: 4px;
}

.page-about .ab-slice-key {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .ab-slice-num {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .ab-slice-name {
  font-size: var(--fs-20);
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-slice-desc {
  color: var(--ivory);
  margin: 0;
}

.page-about .ab-slice-use {
  font-size: var(--fs-12);
  color: var(--amber);
  margin: 0;
  letter-spacing: 0.02em;
}

.page-about .ab-slice-note {
  margin-top: 20px;
  max-width: 62ch;
}

/* —— 团队 —— */
.page-about .ab-team-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: 1fr;
}

.page-about .ab-team-body p + p {
  margin-top: 16px;
}

.page-about .ab-team-media {
  margin: 0;
}

.page-about .ab-tabs {
  margin-top: 28px;
  border: 1px solid var(--line);
}

.page-about .ab-tablist {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  background: var(--turf);
}

.page-about .ab-tab {
  flex: 1 1 auto;
  appearance: none;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line-hair);
  color: var(--mute);
  font-family: var(--font-cn);
  font-size: var(--fs-14);
  padding: 12px 14px;
  cursor: pointer;
  position: relative;
  transition: color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .ab-tab:last-child {
  border-right: 0;
}

.page-about .ab-tab::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: var(--cyan);
  transition: width 160ms var(--ease);
}

.page-about .ab-tab:hover {
  color: var(--ivory);
}

.page-about .ab-tab.is-active {
  color: var(--cyan);
  background: var(--cyan-wash);
}

.page-about .ab-tab.is-active::before {
  width: 100%;
}

.page-about .ab-tab:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .ab-tabpanels {
  background: var(--table);
}

.page-about .ab-panel-item {
  display: none;
  padding: 18px 18px 20px;
  border-left: 3px solid var(--cyan);
  color: var(--ivory);
  font-size: var(--fs-16);
  line-height: 1.75;
}

.page-about .ab-panel-item.is-active {
  display: block;
  animation: ab-fade 240ms var(--ease);
}

.page-about .ab-panel-item p {
  margin: 0;
}

@keyframes ab-fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* —— 时效 —— */
.page-about .ab-speed {
  background: var(--turf-deep);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-speed-strip {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: 1px;
  background: var(--line-hair);
  grid-template-columns: 1fr;
  border: 1px solid var(--line-hair);
}

.page-about .ab-speed-card {
  background: var(--ink);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}

.page-about .ab-speed-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, transparent 72%);
}

.page-about .ab-speed-card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--amber) 0%, transparent 72%);
}

.page-about .ab-speed-card .num-figure {
  font-size: clamp(40px, 9vw, 72px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-speed-card:nth-child(2) .num-figure {
  color: var(--amber);
}

.page-about .ab-speed-card p {
  margin: 8px 0 0;
  color: var(--ivory);
  font-size: var(--fs-14);
  line-height: 1.7;
}

/* —— 谁在用 —— */
.page-about .ab-who-list {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: var(--line-hair);
  border-top: 1px solid var(--line-hair);
}

.page-about .ab-who-item {
  background: var(--ink);
  padding: 22px 18px;
  border-left: 3px solid transparent;
  transition: border-left-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .ab-who-item:hover {
  border-left-color: var(--cyan);
  background: var(--turf);
}

.page-about .ab-who-name {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 800;
  color: var(--cyan-soft);
  letter-spacing: -0.01em;
}

.page-about .ab-who-item p {
  margin: 0;
  color: var(--ivory);
  font-size: var(--fs-14);
  line-height: 1.75;
}

.page-about .ab-who-tail {
  margin-top: 22px;
  font-size: var(--fs-14);
  color: var(--mute);
}

/* —— 背景与联系 —— */
.page-about .ab-base-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .ab-base-media {
  margin: 0;
}

.page-about .ab-base-links {
  margin-top: 20px;
  font-size: var(--fs-14);
  color: var(--mute);
  line-height: 1.9;
}

/* —— 链接统一 —— */
.page-about a:not(.btn):not(.crumb):not(.ab-jump):not(.ab-tab) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about a:not(.btn):not(.crumb):not(.ab-jump):not(.ab-tab):hover,
.page-about a:not(.btn):not(.crumb):not(.ab-jump):not(.ab-tab):focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* —— 窄屏微调 —— */
@media (max-width: 600px) {
  .page-about .ab-hero-side {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 18px;
  }

  .page-about .ab-timeline {
    max-width: 96px;
  }

  .page-about .ab-slice-row {
    padding-left: 14px;
    padding-right: 10px;
  }

  .page-about .ab-speed-card,
  .page-about .ab-who-item {
    padding: 20px 16px;
  }
}

/* —— 平板与桌面：左右分屏、宽窄交替 —— */
@media (min-width: 860px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 8fr) minmax(200px, 4fr);
    gap: clamp(36px, 5vw, 72px);
  }

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

  .page-about .ab-origin-grid .ab-origin-media {
    margin-top: 24px;
  }

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

  .page-about .ab-team-grid .ab-team-media {
    margin-top: 40px;
  }

  .page-about .ab-slice-row {
    grid-template-columns: minmax(180px, 3fr) minmax(0, 5fr) minmax(0, 3fr);
    align-items: baseline;
    gap: 24px;
    padding: 24px 20px 24px 22px;
  }

  .page-about .ab-slice-row:nth-child(even) {
    transform: translateX(var(--ab-row-shift));
  }

  .page-about .ab-slice-use {
    text-align: right;
  }

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

  .page-about .ab-speed-card:nth-child(2) {
    transform: translateY(-14px);
  }

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

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

@media (min-width: 1100px) {
  .page-about .ab-hero-title {
    max-width: 16ch;
  }

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

  .page-about .ab-who-item:nth-child(even) {
    transform: translateY(14px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-jump,
  .page-about .ab-slice-row,
  .page-about .ab-slice-row::after,
  .page-about .ab-tab,
  .page-about .ab-tab::before,
  .page-about .ab-who-item {
    transition: none;
    transform: none;
  }

  .page-about .ab-panel-item.is-active {
    animation: none;
  }
}