.page-about {
  --ab-hair: rgba(185, 196, 212, .18);
  --ab-hair-strong: rgba(185, 196, 212, .32);
  --ab-shadow: 0 24px 56px rgba(3, 10, 22, .42);
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: .02em;
}

.page-about .link {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 211, 211, .4);
}

.page-about .link:hover,
.page-about .link:focus-visible {
  color: var(--gold-300);
  border-bottom-color: var(--gold-300);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb-wrap {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumb-link {
  color: var(--text-dim);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--gold-300);
}

.page-about .breadcrumb-current {
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 76px);
  background: linear-gradient(158deg, var(--ink-700) 0%, var(--ink-900) 66%);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -8%;
  width: min(58%, 560px);
  height: 120%;
  background: linear-gradient(135deg, rgba(242, 169, 59, .16), rgba(35, 211, 211, .10));
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -46%;
  width: min(560px, 76vw);
  height: min(560px, 76vw);
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(35, 211, 211, .13), transparent 64%);
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .ab-hero-title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 64px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .ab-hero-lede {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--text-dim);
}

.page-about .ab-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 锚点条 ---------- */
.page-about .ab-anchorbar {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 14px 0;
  background: rgba(11, 27, 51, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-anchor-list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 4px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-anchor-list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-anchor-link {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--ab-hair);
  background: var(--ink-700);
  color: var(--text-dim);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .ab-anchor-link:hover,
.page-about .ab-anchor-link:focus-visible {
  color: var(--ink-900);
  background: var(--gold-300);
  border-color: var(--gold-300);
}

.page-about .ab-anchor-link[data-spy-current="true"] {
  color: var(--ink-900);
  background: var(--gold-500);
  border-color: var(--gold-500);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .ab-section--tint {
  background: linear-gradient(180deg, rgba(20, 41, 75, .72), rgba(11, 27, 51, .2));
  border-top: 1px solid var(--ab-hair);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-section-head {
  max-width: 760px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-section-title {
  margin: 6px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.18;
  letter-spacing: -.02em;
}

.page-about .ab-section-lede {
  margin: 0;
  max-width: 64ch;
  color: var(--text-dim);
  font-size: clamp(15px, 1.5vw, 17px);
}

.page-about .ab-prose {
  max-width: 68ch;
  margin-top: clamp(22px, 3.5vw, 36px);
  color: var(--text-dim);
}

.page-about .ab-prose--tight {
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .ab-prose p {
  margin: 0 0 1em;
}

.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 阅读人群 ---------- */
.page-about .ab-audience {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-audience-item {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-md);
  background: var(--ink-700);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-about .ab-audience-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gold-500), var(--cyan-600));
}

.page-about .ab-audience-item:hover {
  transform: translateY(-4px);
  border-color: var(--ab-hair-strong);
}

.page-about .ab-audience-num {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--gold-500);
}

.page-about .ab-audience-title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .ab-audience-text {
  margin: 0;
  color: var(--text-dim);
  font-size: 15px;
}

/* ---------- 数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-md);
  background: var(--ab-hair);
}

.page-about .ab-stat {
  padding: clamp(16px, 2.6vw, 26px);
  background: var(--ink-700);
}

.page-about .ab-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.1;
  color: var(--gold-500);
}

.page-about .ab-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 图片 ---------- */
.page-about .ab-banner,
.page-about .ab-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .ab-figure--loose {
  margin-top: clamp(34px, 5vw, 60px);
}

.page-about .ab-banner img,
.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-lg);
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .ab-banner img {
  aspect-ratio: 2 / 1;
}

.page-about .ab-figure img {
  aspect-ratio: 16 / 9;
}

.page-about .ab-figure--loose img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure-cap {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-dim);
}

/* ---------- 变更确认步骤 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-flow-step {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--ab-hair);
  border-top: 3px solid var(--gold-500);
  border-radius: var(--radius-md);
  background: var(--ink-700);
}

.page-about .ab-flow-index {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan-400);
}

.page-about .ab-flow-title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-flow-text {
  margin: 0;
  color: var(--text-dim);
  font-size: 15px;
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  right: 27px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold-500), var(--cyan-600));
  opacity: .55;
}

.page-about .ab-tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 56px;
  gap: clamp(14px, 3vw, 32px);
  padding-bottom: clamp(28px, 4vw, 46px);
}

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

.page-about .ab-tl-content {
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-tl-title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.4vw, 23px);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .ab-tl-text {
  margin: 0;
  max-width: 60ch;
  color: var(--text-dim);
  font-size: 15px;
}

.page-about .ab-tl-marker {
  position: relative;
  padding-top: 26px;
  text-align: center;
}

.page-about .ab-tl-marker::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 6px rgba(35, 211, 211, .14);
}

.page-about .ab-tl-year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--gold-500);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .ab-partner-card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-900));
}

.page-about .ab-partner-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.05;
  color: var(--gold-500);
}

.page-about .ab-partner-title {
  margin: 12px 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ab-partner-text {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
}

/* ---------- 多端能力卡片 ---------- */
.page-about .ab-devices {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .ab-device-card {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  background: var(--sand-200);
  color: var(--ink-900);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .ab-devices .ab-device-card:nth-child(even) {
  background: var(--sand-50);
}

.page-about .ab-device-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-device-title {
  position: relative;
  margin: 0 0 12px;
  padding-left: 16px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .ab-device-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .38em;
  width: 6px;
  height: 1.05em;
  border-radius: 3px;
  background: var(--gold-500);
}

.page-about .ab-device-card p {
  margin: 0;
  color: var(--ink-700);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 收尾 ---------- */
.page-about .ab-closing {
  border-top: 1px solid var(--ab-hair);
  background: linear-gradient(140deg, var(--ink-700), var(--ink-900) 70%);
}

.page-about .ab-closing-inner {
  max-width: 820px;
}

.page-about .ab-closing-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -.02em;
}

.page-about .ab-closing-text {
  margin: 0 0 26px;
  max-width: 66ch;
  color: var(--text-dim);
  font-size: clamp(15px, 1.5vw, 17px);
}

.page-about .ab-closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-closing-note {
  margin: 24px 0 0;
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (max-width: 719px) {
  .page-about .ab-timeline::before {
    display: none;
  }

  .page-about .ab-tl-item {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-about .ab-tl-marker {
    order: -1;
    padding-top: 0;
    text-align: left;
  }

  .page-about .ab-tl-marker::before {
    display: none;
  }

  .page-about .ab-tl-year {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    background: rgba(242, 169, 59, .14);
    margin-bottom: 10px;
  }

  .page-about .ab-tl-content {
    border-top: 0;
    padding-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-audience-item,
  .page-about .ab-device-card,
  .page-about .ab-anchor-link {
    transition: none;
  }

  .page-about .ab-audience-item:hover,
  .page-about .ab-device-card:hover {
    transform: none;
  }
}
</style>