.page-about {
  --about-pad: clamp(56px, 7.5vw, 108px);
  --about-head-gap: clamp(26px, 3vw, 46px);
  background: var(--sea);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 26px;
  padding-bottom: 4px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}
.page-about .breadcrumb a.breadcrumb__item {
  color: var(--ice);
  text-decoration: none;
}
.page-about .breadcrumb a.breadcrumb__item:hover {
  color: var(--coral-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 4.5vw, 60px);
  padding-top: clamp(30px, 4vw, 56px);
  padding-bottom: var(--about-pad);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--coral) 0%, rgba(127,200,248,.4) 42%, transparent 100%);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--neon);
}
.page-about .about-hero__eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--neon);
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  font-family: var(--font-head);
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: #fff;
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.15vw, 17.5px);
  line-height: 1.8;
  color: rgba(244, 247, 251, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__visual {
  position: relative;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background:
    radial-gradient(circle at 76% 18%, rgba(61, 224, 160, .20), transparent 48%),
    radial-gradient(circle at 12% 88%, rgba(255, 107, 74, .28), transparent 55%),
    linear-gradient(158deg, #0E3255 0%, var(--sea-deep) 100%);
  box-shadow: 0 26px 64px rgba(3, 12, 24, .48);
}
.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-radial-gradient(circle at 52% 54%, transparent 0 22px, rgba(127, 200, 248, .16) 22px 23px);
  opacity: .8;
}
.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  left: -16%;
  top: 46%;
  width: 132%;
  height: 6px;
  transform: rotate(-11deg);
  background: linear-gradient(90deg, transparent, var(--coral) 28%, var(--amber) 60%, transparent);
}
.page-about .about-hero__stamp {
  position: absolute;
  right: 18px;
  bottom: 16px;
  z-index: 2;
  padding: 6px 14px;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--ice);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(7, 26, 46, .74);
}

/* ---------- 章节带通用 ---------- */
.page-about .section-block {
  position: relative;
  padding-block: var(--about-pad);
}
.page-about .about-origin { background: var(--sea); }
.page-about .about-timeline {
  background: var(--paper);
  color: var(--ink);
}
.page-about .about-team { background: var(--sea-deep); }
.page-about .about-review { background: var(--sea); }
.page-about .about-reach {
  background: var(--sea-deep);
  border-top: 4px solid var(--coral);
}
.page-about .about-next {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-chapter {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding-bottom: 16px;
  margin-bottom: var(--about-head-gap);
  border-bottom: 1px solid var(--line);
}
.page-about .section-block--paper .about-chapter {
  border-bottom-color: rgba(11, 42, 74, .16);
}
.page-about .about-chapter__num {
  flex: none;
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--coral);
}
.page-about .about-chapter__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -.01em;
  color: #fff;
}
.page-about .section-block--paper .about-chapter__title {
  color: var(--sea-deep);
}
.page-about .about-chapter__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 251, .68);
}

/* ---------- 通用正文 ---------- */
.page-about .prose {
  font-size: 16.5px;
  line-height: 1.82;
  color: rgba(244, 247, 251, .8);
}
.page-about .prose p {
  margin: 0 0 1.15em;
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .section-block--paper .prose {
  color: rgba(10, 16, 23, .78);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 3.6vw, 52px);
}
.page-about .about-origin__media {
  margin: 0;
}
.page-about .media-frame {
  display: block;
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}
.page-about .media-frame__caption {
  display: block;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 02 版本轨道 ---------- */
.page-about .version-rail {
  margin-bottom: clamp(30px, 4vw, 52px);
}
.page-about .version-rail__nodes {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.page-about .version-node {
  position: relative;
  flex: 1 0 180px;
  min-width: 180px;
  padding: 36px 20px 0 0;
  scroll-snap-align: start;
}
.page-about .version-node::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--coral), rgba(255, 107, 74, .28));
}
.page-about .version-node:last-child::before {
  background: linear-gradient(90deg, var(--coral), transparent);
}
.page-about .version-node__dot {
  position: absolute;
  left: 0;
  top: 16px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--coral);
}
.page-about .version-node--live .version-node__dot {
  background: var(--neon);
  border-color: var(--sea-deep);
  box-shadow: 0 0 0 4px rgba(61, 224, 160, .2);
}
.page-about .version-node__id {
  display: block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--sea-deep);
}
.page-about .version-node__name {
  display: block;
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(10, 16, 23, .62);
}

.page-about .version-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(11, 42, 74, .14);
}
.page-about .version-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 0 22px 20px;
  border-bottom: 1px solid rgba(11, 42, 74, .14);
}
.page-about .version-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--coral), rgba(255, 107, 74, .14));
}
.page-about .version-row__id {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--coral);
}
.page-about .version-row__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--sea-deep);
}
.page-about .version-row__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.76;
  color: rgba(10, 16, 23, .72);
}

.page-about .about-timeline__media {
  margin: clamp(36px, 4.6vw, 64px) 0 0;
}
.page-about .about-timeline__media img {
  border-color: rgba(11, 42, 74, .16);
}
.page-about .about-timeline__media .media-frame__caption {
  color: rgba(10, 16, 23, .58);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}
.page-about .about-team__figure {
  margin: 0;
  font-size: clamp(64px, 9vw, 104px);
  font-weight: 700;
  line-height: .92;
  letter-spacing: -.02em;
  color: var(--coral);
}
.page-about .about-team__caption {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .76);
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .team-item {
  padding: 24px 22px;
  background: var(--sea-deep);
  transition: background .2s ease;
}
.page-about .team-item:hover {
  background: #0C2338;
}
.page-about .team-item__index {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ice);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  padding: 2px 8px;
}
.page-about .team-item__name {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  color: #fff;
}
.page-about .team-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(244, 247, 251, .72);
}

/* ---------- 04 复核与节奏 ---------- */
.page-about .review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .review-step {
  position: relative;
  padding: 30px 24px 28px;
  background: linear-gradient(150deg, #0D2B4A, var(--sea-deep));
}
.page-about .review-step__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sea-deep);
  background: var(--ice);
  border-radius: 3px;
  padding: 3px 10px;
}
.page-about .review-step__title {
  margin: 16px 0 10px;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 600;
  color: #fff;
}
.page-about .review-step__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .74);
}

.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 3.4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .cadence__item {
  padding: 26px 24px;
  background: var(--sea-deep);
}
.page-about .cadence__head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 12px;
}
.page-about .cadence__num {
  font-size: clamp(40px, 5.4vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}
.page-about .cadence__unit {
  font-size: 15px;
  color: var(--mist);
}
.page-about .cadence__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .74);
}

/* ---------- 中间横向带 ---------- */
.page-about .about-band {
  margin: clamp(34px, 4.6vw, 66px) auto;
}
.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.page-about .about-band__caption {
  display: block;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 05 覆盖范围 ---------- */
.page-about .about-scale {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(26px, 3.4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-scale .data-figure {
  padding: 28px 22px 24px;
  background: rgba(7, 26, 46, .92);
}
.page-about .about-scale .data-figure__value {
  color: var(--ice);
}
.page-about .about-scale .data-figure--accent .data-figure__value {
  color: var(--coral);
}
.page-about .about-scale .data-figure__label {
  color: rgba(244, 247, 251, .7);
}

.page-about .about-reach__text p {
  margin: 0 0 1.1em;
}
.page-about .about-reach__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 06 下一步 ---------- */
.page-about .next-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(11, 42, 74, .14);
}
.page-about .next-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 26px 0;
  border-bottom: 1px solid rgba(11, 42, 74, .14);
}
.page-about .next-item__num {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--coral);
}
.page-about .next-item__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--sea-deep);
}
.page-about .next-item__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(10, 16, 23, .74);
}

.page-about .next-cta {
  margin-top: clamp(30px, 4vw, 50px);
  padding: 26px 24px;
  border: 1px solid rgba(11, 42, 74, .16);
  border-left: 4px solid var(--coral);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(127, 200, 248, .14), rgba(255, 107, 74, .06));
}
.page-about .next-cta__text {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--sea-deep);
}
.page-about .next-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .version-row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
  }
  .page-about .review-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .next-item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 22px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .about-origin__media {
    margin-top: 40px;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }
}

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

@media (max-width: 560px) {
  .page-about .about-hero__actions .btn,
  .page-about .next-cta__actions .btn,
  .page-about .about-reach__links .btn {
    flex: 1 1 100%;
    text-align: center;
  }
  .page-about .about-hero__visual {
    aspect-ratio: 3 / 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-item {
    transition: none;
  }
}