.page-about {
  --about-sticky-top: 104px;
  --about-noterail: rgba(255, 255, 255, .68);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 36px 0 0;
  color: var(--snow);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(14, 107, 214, .62) 0%, rgba(14, 107, 214, 0) 62%),
    linear-gradient(178deg, #0A2E5C 0%, #0C3A6E 58%, #0E4C8C 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-radial-gradient(circle at 10% 118%, rgba(255, 255, 255, .055) 0 1px, transparent 1px 36px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-bottom: 44px;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--about-noterail);
}

.page-about .about-crumb a {
  color: rgba(255, 255, 255, .82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease-hover), border-color .18s var(--ease-hover);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold-lift);
  border-bottom-color: var(--gold-lift);
}

.page-about .about-hero .eyebrow {
  margin-top: 26px;
  color: var(--gold-lift);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin: 0;
  border-radius: var(--radius-media) var(--radius-media) 0 0;
  overflow: hidden;
  box-shadow: 0 -10px 44px rgba(4, 20, 42, .28);
}

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

/* ---------- 章节头 ---------- */
.page-about .about-head {
  max-width: 62ch;
}

.page-about .about-head__title {
  margin: 14px 0 0;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  color: var(--mist);
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  color: var(--sky);
  font-size: .9375rem;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 107, 214, .3);
  transition: color .18s var(--ease-hover), border-color .18s var(--ease-hover);
}

.page-about .about-link::after {
  content: "→";
  font-weight: 400;
  transition: transform .18s var(--ease-hover);
}

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

.page-about .about-link:hover::after {
  transform: translateX(3px);
}

/* ---------- 时间线 ---------- */
.page-about .about-line__grid {
  display: grid;
  gap: 40px;
  margin-top: 48px;
}

.page-about .tl-index {
  position: relative;
  margin: 0;
  padding: 6px 0 6px 24px;
  list-style: none;
}

.page-about .tl-index::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--sky) 0%, rgba(14, 107, 214, .18) 100%);
}

.page-about .tl-index__item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .tl-index__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--snow);
  border: 2px solid var(--gold);
  transition: background .18s var(--ease-hover), transform .18s var(--ease-hover);
}

.page-about .tl-index__stage {
  display: block;
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .tl-index__link {
  display: inline-block;
  margin-top: 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.4;
  color: var(--deep);
  text-decoration: none;
  transition: color .18s var(--ease-hover);
}

.page-about .tl-index__link:hover,
.page-about .tl-index__link:focus-visible {
  color: var(--sky);
}

.page-about .tl-index__note {
  margin: 6px 0 0;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-line__body {
  display: grid;
  gap: 38px;
}

.page-about .tl-stage {
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line-sky);
}

.page-about .tl-stage:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .tl-stage__label {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--sand);
  color: var(--deep);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .tl-stage .h3 {
  margin: 14px 0 0;
}

.page-about .tl-stage p {
  margin: 12px 0 0;
  color: var(--ink);
  line-height: 1.8;
}

.page-about .about-shot {
  margin: 0;
  border-radius: var(--radius-media);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

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

.page-about .about-curve {
  margin: 0;
  padding: 22px 20px 16px;
  border-radius: var(--radius-card);
  background: linear-gradient(180deg, var(--pale) 0%, rgba(231, 241, 254, .45) 100%);
}

.page-about .about-curve svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-curve__caption {
  margin: 12px 0 0;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 三种麻烦 ---------- */
.page-about .trouble-list {
  display: grid;
  gap: 18px;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .trouble-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 26px 22px;
  border-radius: var(--radius-card);
  background: var(--snow);
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--sky);
  transition: box-shadow .18s var(--ease-hover), transform .18s var(--ease-hover);
}

.page-about .trouble-item:nth-child(2) {
  border-left-color: var(--gold);
}

.page-about .trouble-item:nth-child(3) {
  border-left-color: var(--deep);
}

.page-about .trouble-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.page-about .trouble-item__num {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--pale);
  color: var(--deep);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.page-about .trouble-item:nth-child(2) .trouble-item__num {
  background: var(--sand);
}

.page-about .trouble-item__body .h3 {
  margin: 4px 0 0;
}

.page-about .trouble-item__body p {
  margin: 10px 0 0;
  color: var(--ink);
  line-height: 1.8;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  background: var(--pale);
}

.page-about .cadence-grid {
  display: grid;
  gap: 16px;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence-item {
  padding: 24px 22px;
  border-radius: var(--radius-card);
  background: var(--snow);
  box-shadow: var(--shadow-card);
  border-top: 3px solid var(--sky);
  transition: box-shadow .18s var(--ease-hover), transform .18s var(--ease-hover);
}

.page-about .cadence-item:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .cadence-item:nth-child(4) {
  border-top-color: var(--saffron);
}

.page-about .cadence-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.page-about .cadence-item__when {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -.01em;
  color: var(--sky);
  font-variant-numeric: tabular-nums;
}

.page-about .cadence-item:nth-child(4) .cadence-item__when {
  color: var(--saffron);
}

.page-about .cadence-item .h3 {
  margin: 10px 0 0;
}

.page-about .cadence-item p {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: .9375rem;
  line-height: 1.75;
}

.page-about .about-cadence__foot {
  margin: 28px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 36px;
  margin-top: 44px;
}

.page-about .team-list {
  display: grid;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-sky);
}

.page-about .team-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .team-row__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.25rem;
  line-height: 1;
  color: var(--sky);
  font-variant-numeric: tabular-nums;
  padding-top: 4px;
}

.page-about .team-row:nth-child(3) .team-row__num {
  color: var(--deep);
}

.page-about .team-row__body .h3 {
  margin: 0;
}

.page-about .team-row__body p {
  margin: 10px 0 0;
  color: var(--ink);
  line-height: 1.8;
}

.page-about .about-team__shot {
  align-self: start;
}

.page-about .about-team__foot {
  margin: 32px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line-sky);
  color: var(--mist);
  font-size: .9375rem;
  line-height: 1.8;
}

.page-about .about-team__foot .about-link {
  margin-top: 0;
}

/* ---------- 行业场景 ---------- */
.page-about .about-scenes {
  background: var(--pale);
}

.page-about .scene-panel {
  margin-top: 40px;
}

.page-about .scene-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .scene-tab {
  appearance: none;
  border: 1px solid rgba(14, 107, 214, .28);
  background: var(--snow);
  color: var(--deep);
  border-radius: var(--radius-pill);
  padding: 9px 17px;
  font-family: var(--font-text);
  font-size: .875rem;
  line-height: 1.2;
  cursor: pointer;
  transition: background .18s var(--ease-hover), color .18s var(--ease-hover), border-color .18s var(--ease-hover);
}

.page-about .scene-tab:hover {
  border-color: var(--sky);
  color: var(--sky);
}

.page-about .scene-tab[aria-pressed="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--deep);
  font-weight: 700;
}

.page-about .scene-tab:focus-visible {
  outline: 2px solid var(--deep);
  outline-offset: 2px;
}

.page-about .scene-notes {
  display: grid;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .scene-note {
  position: relative;
  padding: 14px 18px 14px 26px;
  border-radius: var(--radius-input);
  background: var(--snow);
  color: var(--ink);
  font-size: .9375rem;
  line-height: 1.75;
  box-shadow: 0 2px 10px rgba(10, 46, 92, .05);
}

.page-about .scene-note::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: var(--gold);
}

.page-about .scene-note[hidden] {
  display: none;
}

/* ---------- 数字面板 ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 44px 0 0;
  padding: 0;
}

.page-about .stat {
  padding: 24px 20px;
  border-radius: var(--radius-card);
  background: linear-gradient(165deg, var(--pale) 0%, rgba(231, 241, 254, .35) 100%);
  border: 1px solid rgba(14, 107, 214, .1);
}

.page-about .stat__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.75rem, 4.6vw, 2.5rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}

.page-about .stat:nth-child(2n) .stat__num {
  color: var(--sky);
}

.page-about .stat__label {
  margin: 10px 0 0;
  font-size: .875rem;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 结尾 CTA ---------- */
.page-about .cta-panel {
  display: grid;
  gap: 24px;
  padding: 40px 28px;
  border-radius: var(--radius-card);
  color: var(--snow);
  background:
    radial-gradient(110% 130% at 92% 0%, rgba(14, 107, 214, .55) 0%, rgba(14, 107, 214, 0) 60%),
    linear-gradient(160deg, #0A2E5C 0%, #10467F 100%);
  box-shadow: var(--shadow-card);
}

.page-about .cta-panel__title {
  margin: 0;
  color: var(--snow);
}

.page-about .cta-panel__text p {
  margin: 14px 0 0;
  max-width: 52ch;
  color: rgba(255, 255, 255, .82);
  line-height: 1.8;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .trouble-item {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 24px;
    padding: 30px 30px;
  }

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

  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .cta-panel {
    padding: 48px 44px;
  }
}

@media (min-width: 900px) {
  .page-about .about-line__grid {
    grid-template-columns: 248px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .tl-index {
    position: sticky;
    top: var(--about-sticky-top);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) 400px;
    gap: 56px;
    align-items: start;
  }

  .page-about .cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-about .cta-panel__actions {
    flex-wrap: nowrap;
  }

  .page-about .scene-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 14px;
  }
}

@media (min-width: 1024px) {
  .page-about .cadence-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__title {
    max-width: 26ch;
  }

  .page-about .about-line__body {
    gap: 46px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .tl-index__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .24s var(--ease-out), opacity .24s var(--ease-out), margin-top .24s var(--ease-out);
  }

  .page-about .tl-index__item:hover .tl-index__note,
  .page-about .tl-index__item:focus-within .tl-index__note {
    max-height: 6em;
    margin-top: 6px;
    opacity: 1;
  }

  .page-about .tl-index__item:hover::before,
  .page-about .tl-index__item:focus-within::before {
    background: var(--gold);
    transform: scale(1.18);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .trouble-item,
  .page-about .cadence-item,
  .page-about .about-link::after,
  .page-about .tl-index__item::before {
    transition: none;
  }

  .page-about .trouble-item:hover,
  .page-about .cadence-item:hover {
    transform: none;
  }

  .page-about .about-link:hover::after {
    transform: none;
  }
}

</