.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  --about-index-w: 196px;
  --about-line: rgba(201, 162, 39, .22);
  padding-bottom: clamp(64px, 9vw, 120px);
  color: var(--ink);
  background: var(--void);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 5vw, 64px);
  background:
    radial-gradient(115% 85% at 88% 6%, rgba(123, 77, 255, .17), transparent 62%),
    radial-gradient(85% 70% at 4% 0%, rgba(201, 162, 39, .13), transparent 58%),
    var(--deep);
  border-bottom: 1px solid var(--hairline);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-shadow: 0 0 42px rgba(123, 77, 255, .22);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(242, 242, 247, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__media {
  border: 1px solid var(--line);
  background: var(--carbon);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 数字轨道 ---------- */
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4.5vw, 52px) 0 0;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-numbers__item {
  background: rgba(15, 15, 22, .82);
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-numbers__label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mute);
  order: 2;
}

.page-about .about-numbers__value {
  margin: 0;
  order: 1;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--cyan);
}

.page-about .about-numbers__unit {
  font-size: 13px;
  color: var(--mute);
  letter-spacing: .04em;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  padding-top: clamp(36px, 5vw, 72px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-index {
  border-left: 2px solid var(--about-line);
  padding-left: 16px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-capsule);
  color: rgba(242, 242, 247, .78);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--fast), border-color var(--fast), background var(--fast);
}

.page-about .about-index__link .bs-mono {
  font-size: 11px;
  color: var(--gold);
  letter-spacing: .1em;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink);
  border-color: rgba(123, 77, 255, .62);
  background: rgba(123, 77, 255, .12);
  outline: none;
}

.page-about .about-index__link:focus-visible {
  box-shadow: 0 0 0 2px var(--violet);
}

.page-about .about-index__note {
  display: none;
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(30px, 4vw, 50px) 0;
  border-top: 1px solid var(--hairline);
}

.page-about .about-sec:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
  padding-bottom: 3px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-sec__prose p,
.page-about .about-sec__lede {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 242, 247, .8);
}

.page-about .about-sec__lede {
  margin-bottom: 26px;
  padding-left: 14px;
  border-left: 2px solid rgba(53, 208, 224, .45);
  color: rgba(242, 242, 247, .72);
}

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

/* ---------- 标签胶囊 ---------- */
.page-about .about-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-hi);
  border: 1px solid var(--line);
  border-radius: var(--r-capsule);
  padding: 7px 14px;
  background: rgba(201, 162, 39, .06);
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-scene {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  background: var(--carbon);
  padding: 22px 20px 24px;
  transition: background var(--fast), box-shadow var(--slow);
}

.page-about .about-scene:hover {
  background: #1f1f2b;
  box-shadow: inset 3px 0 0 var(--gold);
}

.page-about .about-scene__lead {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-scene__no {
  font-size: 22px;
  color: var(--gold);
  letter-spacing: .08em;
  line-height: 1;
}

.page-about .about-scene__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  font-family: var(--font-title);
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-scene__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 242, 247, .76);
}

.page-about .about-scene__link {
  display: inline-block;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 208, 224, .4);
  padding-bottom: 2px;
  transition: color var(--fast), border-color var(--fast);
}

.page-about .about-scene__link:hover,
.page-about .about-scene__link:focus-visible {
  color: #7ee6f1;
  border-color: #7ee6f1;
  outline: none;
}

.page-about .about-scene__link:focus-visible {
  box-shadow: 0 0 0 2px var(--violet);
  border-radius: 2px;
}

/* ---------- 数据能力 ---------- */
.page-about .about-cap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 22px 0;
  border-top: 1px dashed rgba(242, 242, 247, .07);
}

.page-about .about-cap:first-of-type {
  border-top: 1px solid var(--hairline);
}

.page-about .about-cap__figure {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-cap__num {
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
  text-shadow: 0 0 30px rgba(53, 208, 224, .28);
}

.page-about .about-cap__unit {
  font-size: 13px;
  color: var(--mute);
  letter-spacing: .06em;
}

.page-about .about-cap__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  font-family: var(--font-title);
  color: var(--gold-hi);
  letter-spacing: -0.01em;
}

.page-about .about-cap__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 242, 247, .78);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 28px;
}

.page-about .about-timeline__figure img,
.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-timeline__figure .bs-media {
  border: 1px solid var(--hairline);
  background: var(--deep);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--cyan) 62%, rgba(53, 208, 224, 0) 100%);
  opacity: .55;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -22px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .16), 0 0 16px rgba(232, 201, 106, .5);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 208, 224, .2), 0 0 20px rgba(53, 208, 224, .6);
}

.page-about .about-timeline__when {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  font-family: var(--font-title);
  color: var(--ink);
}

.page-about .about-timeline__item p:last-child {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 242, 247, .75);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-eco__text p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 242, 247, .78);
}

.page-about .about-eco__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-eco__figure {
  margin: 0;
}

.page-about .about-eco__figure .bs-media {
  border: 1px solid rgba(123, 77, 255, .34);
  background: var(--carbon);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(32px, 4vw, 52px);
  border: 1px solid var(--line);
  background:
    linear-gradient(115deg, rgba(255, 106, 61, .12) 0%, rgba(123, 77, 255, .12) 46%, rgba(53, 208, 224, .1) 100%),
    var(--carbon);
  padding: clamp(24px, 3.4vw, 40px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
}

.page-about .about-cta__copy h2 {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 242, 247, .82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cap {
    grid-template-columns: minmax(150px, 200px) minmax(0, 1fr);
    gap: clamp(18px, 3vw, 40px);
    align-items: start;
    padding: 26px 0;
  }

  .page-about .about-cap__figure {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .about-scene {
    grid-template-columns: minmax(150px, 190px) minmax(0, 1fr);
    gap: clamp(16px, 2.6vw, 32px);
    align-items: start;
    padding: 26px 24px 28px;
  }

  .page-about .about-scene:hover {
    box-shadow: inset 3px 0 0 var(--gold);
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 6.4fr) minmax(0, 5.6fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-hero__title {
    transform: skewX(-2deg);
    transform-origin: left bottom;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 68px);
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    align-self: start;
    padding-left: 18px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    margin-top: 16px;
  }

  .page-about .about-index__item + .about-index__item {
    margin-top: 4px;
  }

  .page-about .about-index__link {
    display: flex;
    justify-content: flex-start;
    border: 0;
    border-left: 1px solid var(--hairline);
    border-radius: 0;
    padding: 7px 0 7px 12px;
    font-size: 14px;
    color: rgba(242, 242, 247, .7);
    white-space: normal;
    background: transparent;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(201, 162, 39, .12), transparent 78%);
  }

  .page-about .about-index__note {
    display: block;
  }
}

@media (min-width: 1280px) {
  .page-about .about-sec__prose {
    max-width: 72ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title {
    transform: none;
  }

  .page-about .about-scene,
  .page-about .about-index__link,
  .page-about .about-scene__link,
  .page-about .about-timeline__dot {
    transition: none;
  }
}