.page-about {
  display: block;
}

/* ---------- 章节索引（宽屏侧栏） ---------- */
.page-about .about-index {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 68px) 0 clamp(52px, 8vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lake) 0 34%, var(--gold) 34% 38%, var(--lake) 38% 100%);
}

.page-about .about-hero__beam {
  position: absolute;
  top: -72px;
  left: -12%;
  width: 124%;
  height: 300px;
  background: linear-gradient(100deg, rgba(240, 180, 41, .30) 0%, rgba(251, 249, 245, 0) 40%, rgba(15, 110, 140, .20) 100%);
  transform: rotate(-8deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 48px);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .crumbs__item {
  color: inherit;
  text-decoration: none;
}

.page-about .crumbs__item:hover {
  color: var(--lake);
}

.page-about .crumbs__item--current {
  color: var(--ink-soft);
}

.page-about .crumbs__sep {
  color: var(--line-strong);
}

.page-about .about-hero__kicker {
  color: var(--lake);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 7.2vw, 90px);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin-top: clamp(20px, 2.6vw, 32px);
  max-width: 60ch;
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: clamp(56px, 8vw, 108px) 0;
}

.page-about .about-block--mist {
  background: var(--mist);
}

.page-about .about-block--deep {
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-head__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(27px, 4.2vw, 46px);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-head__note {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-p {
  margin-top: 16px;
  font-size: clamp(16px, 1.15vw, 17px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-block--deep .about-p {
  color: rgba(251, 249, 245, .82);
}

/* ---------- 网格兜底 ---------- */
.page-about .grid--12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}

.page-about .col-4,
.page-about .col-5,
.page-about .col-7,
.page-about .col-8 {
  grid-column: 1 / -1;
  min-width: 0;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
}

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

.page-about .about-figure--panorama img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: .08em;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 起点章节 ---------- */
.page-about .about-open__no {
  margin-bottom: 10px;
  color: var(--lake);
}

.page-about .about-open__text .about-head__title {
  margin-top: 0;
}

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

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

/* ---------- 历程横向时间轴 ---------- */
.page-about .about-rail__hint {
  margin-bottom: 14px;
  text-align: right;
  color: var(--muted);
}

.page-about .about-rail {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 4px 0 24px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--lake-mid) transparent;
}

.page-about .about-rail::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-rail::-webkit-scrollbar-thumb {
  background: var(--lake-mid);
}

.page-about .about-rail__item {
  flex: 0 0 min(78vw, 300px);
  scroll-snap-align: start;
  padding: 22px 20px 26px;
  background: var(--paper);
  border-top: 4px solid var(--lake-mid);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-rail__item:nth-child(1),
.page-about .about-rail__item:nth-child(2) {
  background: rgba(220, 234, 239, .85);
  border-top-color: var(--mist);
}

.page-about .about-rail__item:nth-child(3),
.page-about .about-rail__item:nth-child(4) {
  border-top-color: var(--lake-mid);
}

.page-about .about-rail__item:nth-child(5) {
  border-top-color: var(--lake);
}

.page-about .about-rail__item:nth-child(6) {
  border-top-color: var(--deep);
}

.page-about .about-rail__no {
  color: var(--muted);
}

.page-about .about-rail__title {
  margin: 10px 0 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-rail__meta {
  margin-top: 6px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--lake);
}

.page-about .about-rail__desc {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-road__figure {
  margin-top: clamp(32px, 5vw, 64px);
}

/* ---------- 团队章节 ---------- */
.page-about .about-team__cards {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__card {
  padding: 22px 24px;
  background: var(--paper);
  border-left: 3px solid var(--lake-mid);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-team__title {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-team__tag {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--lake);
  transition: background-color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-team__desc {
  margin-top: 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.page-about .about-team__figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 伙伴章节 ---------- */
.page-about .about-net__no {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--lake);
}

.page-about .about-net__text .about-head__title {
  margin-top: 0;
}

.page-about .about-net__items {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-net__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-net__item > .about-net__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-net__item strong {
  display: block;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-net__item p {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 晨间节奏 ---------- */
.page-about .about-morning__no {
  color: var(--gold);
}

.page-about .about-morning__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-morning__facts {
  display: grid;
  gap: 14px;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-morning__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--line-invert);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(251, 249, 245, .78);
}

.page-about .about-morning__facts span {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: .01em;
  color: var(--gold);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  max-width: 72ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 桌面断点 ---------- */
@media (min-width: 900px) {
  .page-about .col-4 {
    grid-column: span 4;
  }

  .page-about .col-5 {
    grid-column: span 5;
  }

  .page-about .col-7 {
    grid-column: span 7;
  }

  .page-about .col-8 {
    grid-column: span 8;
  }

  .page-about .about-rail__item {
    flex: 0 0 clamp(240px, 22vw, 300px);
  }

  .page-about .about-team__card:nth-child(2) {
    margin-left: clamp(0px, 3vw, 40px);
  }

  .page-about .about-team__card:nth-child(3) {
    margin-left: clamp(0px, 6vw, 80px);
  }

  .page-about .about-morning__facts li {
    flex-direction: row;
    align-items: baseline;
    gap: 20px;
  }

  .page-about .about-morning__facts span {
    flex: 0 0 auto;
    min-width: 7.5em;
  }
}

@media (min-width: 1440px) {
  .page-about .about-index {
    position: fixed;
    top: 50%;
    right: 18px;
    z-index: 30;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-index__link {
    position: relative;
    padding-left: 14px;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .16em;
    color: var(--muted);
    text-decoration: none;
    transition: color .24s var(--ease);
  }

  .page-about .about-index__link::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    width: 6px;
    height: 1px;
    background: currentColor;
    transition: width .24s var(--ease);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible,
  .page-about .about-index__link[aria-current="true"] {
    color: var(--lake);
  }

  .page-about .about-index__link:hover::before,
  .page-about .about-index__link[aria-current="true"]::before {
    width: 10px;
    background: var(--gold);
  }
}

/* ---------- 悬停增强 ---------- */
@media (hover: hover) {
  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: translateY(-4px);
    box-shadow: 0 18px 40px rgba(10, 44, 61, .13);
    border-left-color: var(--gold);
  }

  .page-about .about-team__card:hover .about-team__tag,
  .page-about .about-team__card:focus-within .about-team__tag {
    background: var(--gold-soft);
    border-color: var(--gold);
  }

  .page-about .about-rail__item:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(10, 44, 61, .12);
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-rail__item,
  .page-about .about-index__link {
    transition: color .2s linear, background-color .2s linear, border-color .2s linear;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within,
  .page-about .about-rail__item:hover {
    transform: none;
  }
}