.page-about {
  --ab-measure: 34em;
  --ab-axis: 13px;
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin: 22px 0 6px;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: 26px 0 54px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -150px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 26, 0.20), rgba(255, 107, 26, 0) 68%);
  z-index: -1;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 38%;
  height: 170px;
  background: linear-gradient(100deg, rgba(184, 52, 31, 0.34), rgba(184, 52, 31, 0));
  clip-path: polygon(0 0, 100% 58%, 100% 100%, 0 100%);
  z-index: -1;
  pointer-events: none;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: 34px;
}

.page-about .ab-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 9vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  transform: skewX(-4deg);
  text-shadow: 0 0 1px rgba(255, 107, 26, 0.85), 0 0 28px rgba(255, 107, 26, 0.24);
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: var(--ab-measure);
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(247, 244, 239, 0.78);
}

.page-about .ab-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .ab-hero__stats > div {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
}

.page-about .ab-hero__stats dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-mid);
}

.page-about .ab-hero__stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  color: var(--spark);
}

.page-about .ab-hero__art {
  display: grid;
  place-items: center;
  min-height: 240px;
}

.page-about .ab-hero__svg {
  width: min(100%, 400px);
  height: auto;
}

.page-about .ab-ring-fire {
  stroke-dasharray: 510 729;
  stroke-dashoffset: 510;
  animation: ab-draw 1.4s var(--ease) 0.15s forwards;
}

.page-about .ab-ring-cool {
  stroke-dasharray: 211 528;
  stroke-dashoffset: 211;
  animation: ab-draw 1.1s var(--ease) 0.5s forwards;
}

@keyframes ab-draw {
  to {
    stroke-dashoffset: 0;
  }
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  position: relative;
  padding: 58px 0;
}

.page-about .ab-section--alt {
  background: linear-gradient(180deg, rgba(26, 29, 35, 0.9), rgba(26, 29, 35, 0.28));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-section h2 {
  margin: 8px 0 0;
  max-width: 24em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

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

.page-about .ab-more {
  margin: 26px 0 0;
  font-size: 14px;
  color: var(--gray-mid);
}

.page-about .ab-more a {
  color: var(--spark);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cool);
  padding-bottom: 2px;
}

/* ---------- 起点 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 22px;
}

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

.page-about .ab-pull {
  margin: 24px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--ember);
  max-width: 28em;
  font-family: var(--font-display);
  font-size: 18.5px;
  line-height: 1.72;
  color: var(--sand);
}

.page-about .ab-figure {
  margin: 32px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .ab-figure .media-frame__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure--lead {
  margin-top: 0;
  margin-bottom: 34px;
}

.page-about .ab-figure--flush {
  margin: 0;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin-top: 36px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: var(--ab-axis);
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--ember), rgba(184, 52, 31, 0.55) 55%, var(--spark-deep));
}

.page-about .ab-node {
  position: relative;
  padding-left: 46px;
  margin-bottom: 32px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--ember);
  box-shadow: 0 0 12px rgba(255, 107, 26, 0.7);
}

.page-about .ab-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ember);
}

.page-about .ab-node__title {
  margin: 12px 0 8px;
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .ab-node__text {
  margin: 0;
  max-width: 30em;
  font-size: 15.5px;
  line-height: 1.76;
  color: rgba(247, 244, 239, 0.72);
}

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

.page-about .ab-node__more summary {
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--spark);
}

.page-about .ab-node__more summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node__more summary::before {
  content: "＋ ";
  font-family: var(--font-mono);
}

.page-about .ab-node__more[open] summary::before {
  content: "－ ";
}

.page-about .ab-node__more p {
  margin: 10px 0 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-mid);
}

.page-about .ab-band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 26px;
  width: 100%;
  margin: 0 0 34px;
  padding: 15px 20px;
  border-radius: var(--radius-md);
  border-left: 2px solid var(--spark);
  background-color: var(--panel);
  background-image: linear-gradient(100deg, rgba(33, 230, 193, 0.10), rgba(255, 107, 26, 0.05));
}

.page-about .ab-band__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray-mid);
}

.page-about .ab-band__val {
  font-size: 14px;
  color: rgba(247, 244, 239, 0.82);
}

/* ---------- 栏目矩阵 ---------- */
.page-about .ab-cols {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .ab-col {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 22px 20px;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .ab-col::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ember), var(--ember-deep));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.24s var(--ease);
}

.page-about .ab-col:hover,
.page-about .ab-col:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-warm);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.42);
}

.page-about .ab-col:hover::after,
.page-about .ab-col:focus-within::after {
  transform: scaleX(1);
}

.page-about .ab-col__figure {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .ab-col__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--spark);
}

.page-about .ab-col__unit {
  font-size: 13px;
  color: var(--gray-mid);
}

.page-about .ab-col__text {
  flex: 1;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(247, 244, 239, 0.7);
}

.page-about .ab-col__freq {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-cool);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--spark);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .ab-team__item {
  padding: 22px 22px 24px;
  border-radius: var(--radius-md);
  background: rgba(14, 15, 18, 0.72);
  border: 1px solid var(--line);
}

.page-about .ab-team__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ember);
}

.page-about .ab-team__name {
  margin: 12px 0 10px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .ab-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(247, 244, 239, 0.7);
}

/* ---------- 桌面端 ---------- */
.page-about .ab-desktop {
  display: grid;
  gap: 32px;
}

.page-about .ab-desktop__copy .prose + .prose {
  margin-top: 16px;
}

.page-about .ab-desktop__copy .btn {
  margin-top: 26px;
}

.page-about .ab-desktop__panel {
  padding: 26px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(184, 52, 31, 0.28), rgba(26, 29, 35, 0.95) 58%);
  border: 1px solid var(--line-warm);
  clip-path: polygon(0 5%, 100% 0, 100% 100%, 0 95%);
}

.page-about .ab-desktop__big {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 62px;
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--spark);
}

.page-about .ab-desktop__bigcap {
  margin: 10px 0 20px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(247, 244, 239, 0.78);
}

.page-about .ab-desktop__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-desktop__list li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(247, 244, 239, 0.09);
}

.page-about .ab-desktop__k {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gray-mid);
}

.page-about .ab-desktop__v {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--white-hot);
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

.page-about .ab-partners__body .prose + .prose {
  margin-top: 14px;
}

.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}

.page-about .ab-partners__item {
  padding: 16px 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 107, 26, 0.07);
  border: 1px solid var(--line-warm);
}

.page-about .ab-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--ember);
}

.page-about .ab-partners__cap {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(247, 244, 239, 0.72);
}

/* ---------- 数据质量 ---------- */
.page-about .ab-quality {
  display: grid;
  gap: 16px;
  margin: 28px 0 26px;
}

.page-about .ab-quality__item {
  padding: 22px 22px 24px;
  border-left: 3px solid var(--spark);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(26, 29, 35, 0.72);
}

.page-about .ab-quality__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
}

.page-about .ab-quality__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(247, 244, 239, 0.72);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  position: relative;
  isolation: isolate;
  padding: 54px 0 66px;
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(120deg, rgba(184, 52, 31, 0.32), rgba(255, 107, 26, 0.06) 46%, rgba(14, 15, 18, 0) 78%);
  clip-path: polygon(0 0, 100% 6%, 100% 100%, 0 100%);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 30px;
}

.page-about .ab-cta__col h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.28;
}

.page-about .ab-cta__text {
  margin: 0 0 22px;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 244, 239, 0.76);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .ab-quality {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cta__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 44px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-section {
    padding: 80px 0;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 42px;
    align-items: center;
  }
}

@media (min-width: 920px) {
  .page-about .ab-timeline::before {
    left: 50%;
  }

  .page-about .ab-node {
    width: calc(50% - 46px);
    padding-left: 0;
    margin-bottom: 44px;
  }

  .page-about .ab-node--left {
    margin-right: auto;
    padding-right: 38px;
    text-align: right;
  }

  .page-about .ab-node--left .ab-node__text {
    margin-left: auto;
  }

  .page-about .ab-node--right {
    margin-left: auto;
    padding-left: 38px;
  }

  .page-about .ab-node::before {
    top: 26px;
  }

  .page-about .ab-node--left::before {
    left: auto;
    right: -52px;
  }

  .page-about .ab-node--right::before {
    left: -52px;
    right: auto;
  }

  .page-about .ab-band {
    margin: 4px 0 44px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding: 40px 0 76px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .ab-hero__art {
    min-height: 340px;
  }
}

@media (min-width: 940px) {
  .page-about .ab-desktop {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
    gap: 56px;
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-cols {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-ring-fire,
  .page-about .ab-ring-cool {
    animation: none;
    stroke-dashoffset: 0;
  }

  .page-about .ab-col {
    transition: none;
  }
}