.page-about {
  --about-rail: 160px;
  background: var(--paper);
  color: var(--ink-black);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 18px;
  padding-bottom: 4px;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(11, 20, 32, .55);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(15, 36, 56, .3);
}
.page-about .breadcrumb a {
  color: var(--celadon-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb a:hover {
  border-bottom-color: currentColor;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 10px 0 44px;
  isolation: isolate;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -60px 0 0;
  z-index: -1;
  background:
    radial-gradient(120% 88% at 90% 4%, rgba(255, 122, 51, .12), transparent 56%),
    radial-gradient(96% 80% at 4% 96%, rgba(60, 143, 123, .16), transparent 62%),
    radial-gradient(80% 60% at 50% 50%, rgba(15, 36, 56, .05), transparent 70%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  padding: 30px 20px 26px;
  background: rgba(247, 245, 240, .78);
  border: var(--line-hair);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}
.page-about .about-hero__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 18px;
  height: 8px;
  background: repeating-linear-gradient(90deg, rgba(15, 36, 56, .3) 0 1px, transparent 1px 28px);
  pointer-events: none;
}
.page-about .about-hero__inner::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 96px;
  height: 96px;
  background: linear-gradient(225deg, rgba(255, 122, 51, .22), transparent 68%);
  border-top-right-radius: var(--radius);
  pointer-events: none;
}
.page-about h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(30px, 8.2vw, 60px);
  line-height: 1.14;
  letter-spacing: -.012em;
  color: var(--ink-deep);
  margin: 12px 0 0;
  max-width: 20ch;
}
.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(11, 20, 32, .76);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 数据条 ---------- */
.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: rgba(15, 36, 56, .13);
  border: var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .stat-strip > .stat {
  background: rgba(247, 245, 240, .96);
  padding: 14px 14px 16px;
}
.page-about .stat dt {
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(11, 20, 32, .52);
  margin-bottom: 6px;
}
.page-about .stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  flex-wrap: wrap;
}
.page-about .stat .num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 6vw, 30px);
  font-weight: 500;
  line-height: 1;
  color: var(--ink-deep);
  font-variant-numeric: tabular-nums;
}
.page-about .stat__unit {
  font-size: 11px;
  letter-spacing: .04em;
  color: rgba(11, 20, 32, .58);
}

/* ---------- 章节行 ---------- */
.page-about .about-band {
  position: relative;
}
.page-about .about-band--mist {
  background: var(--mist);
  border-top: var(--line-soft);
  border-bottom: var(--line-soft);
}
.page-about .about-band--celadon {
  background:
    linear-gradient(180deg, rgba(60, 143, 123, .09), rgba(60, 143, 123, 0) 62%),
    var(--paper);
  border-top: var(--line-soft);
}
.page-about .about-band--ink {
  background:
    radial-gradient(90% 70% at 88% 0%, rgba(255, 122, 51, .16), transparent 58%),
    radial-gradient(80% 80% at 4% 100%, rgba(60, 143, 123, .3), transparent 62%),
    var(--ink-deep);
  color: var(--paper);
}

.page-about .about-row {
  display: grid;
  gap: 10px;
  padding: 44px 0 48px;
}
.page-about .about-index {
  position: relative;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--celadon-deep);
  text-transform: uppercase;
}
.page-about .about-index::before {
  content: "";
  display: block;
  width: 34px;
  height: 1px;
  margin-bottom: 10px;
  background: var(--flare);
}
.page-about .about-index--light {
  color: rgba(247, 245, 240, .72);
}
.page-about .about-index--light::before {
  background: var(--gold);
}

.page-about .about-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(23px, 5.8vw, 38px);
  line-height: 1.24;
  letter-spacing: -.008em;
  color: var(--ink-deep);
  margin: 0 0 18px;
  max-width: 24ch;
}
.page-about .about-title--light {
  color: var(--paper);
}
.page-about .about-row__body p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(11, 20, 32, .78);
}
.page-about .about-row__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-band--ink .about-row__body p,
.page-about .about-ink-lede {
  color: rgba(247, 245, 240, .76);
}
.page-about .about-note {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(11, 20, 32, .58);
  padding-left: 14px;
  border-left: 2px solid var(--celadon-light);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--line-hair);
  border-radius: var(--radius);
  background: var(--ink-mid);
}
.page-about .about-figure .frame__caption {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(11, 20, 32, .52);
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(228px, 80%);
  gap: 12px;
  margin: 26px 0 20px;
  padding: 18px 2px 22px;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  border-top: var(--line-hair);
  border-bottom: var(--line-hair);
  outline-offset: 4px;
}
.page-about .tl-item {
  position: relative;
  scroll-snap-align: start;
  padding: 30px 16px 18px;
  background: rgba(247, 245, 240, .94);
  border: var(--line-hair);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: border-color .32s var(--ease-out), transform .32s var(--ease-out);
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 15px;
  left: 16px;
  right: 16px;
  height: 1px;
  background: linear-gradient(90deg, var(--celadon-light), rgba(60, 143, 123, .12));
}
.page-about .tl-item::after {
  content: "";
  position: absolute;
  top: 12px;
  left: 16px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--flare);
  box-shadow: 0 0 0 3px rgba(255, 122, 51, .16);
}
.page-about .tl-item:hover {
  border-color: rgba(31, 95, 81, .46);
  transform: translateY(-2px);
}
.page-about .tl-item__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--celadon-deep);
  padding: 2px 7px;
  border: 1px solid rgba(31, 95, 81, .28);
  border-radius: 2px;
}
.page-about .tl-item__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink-deep);
  margin: 14px 0 8px;
}
.page-about .tl-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(11, 20, 32, .7);
}

/* ---------- 团队面板 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}
.page-about .team-card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--paper);
  border: var(--line-hair);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: border-color .32s var(--ease-out), transform .32s var(--ease-out);
}
.page-about .team-card:hover {
  border-color: rgba(31, 95, 81, .5);
  transform: translateY(-2px);
}
.page-about .team-card__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--flare);
}
.page-about .team-card h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 20px;
  color: var(--ink-deep);
  margin: 10px 0 8px;
}
.page-about .team-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(11, 20, 32, .7);
}

/* ---------- 原则 ---------- */
.page-about .principle-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: rgba(247, 245, 240, .16);
  border: var(--line-light);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .principle {
  padding: 20px 18px 22px;
  background: var(--ink-deep);
  box-shadow: inset 0 0 0 1px transparent;
  transition: box-shadow .32s var(--ease-out), background-color .32s var(--ease-out);
}
.page-about .principle:hover {
  background: #14304a;
  box-shadow: inset 0 0 0 1px rgba(201, 169, 97, .5);
}
.page-about .principle h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 8px;
}
.page-about .principle h3::before {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  margin-bottom: 10px;
  background: var(--celadon-light);
}
.page-about .principle p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(247, 245, 240, .72);
}

/* ---------- 内链卡 ---------- */
.page-about .about-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 24px;
}
.page-about .link-card {
  display: block;
  padding: 16px 18px 18px;
  background: rgba(247, 245, 240, .9);
  border: var(--line-hair);
  border-left: 2px solid var(--celadon-light);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color .32s var(--ease-out), transform .32s var(--ease-out);
}
.page-about .link-card:hover {
  border-left-color: var(--flare);
  transform: translateY(-2px);
}
.page-about .link-card__label {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--ink-deep);
  margin-bottom: 4px;
}
.page-about .link-card__desc {
  display: block;
  font-size: 12.5px;
  line-height: 1.75;
  color: rgba(11, 20, 32, .64);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 34px 0 48px;
  background:
    linear-gradient(120deg, rgba(255, 122, 51, .1), rgba(60, 143, 123, .14) 60%, rgba(15, 36, 56, .06)),
    var(--paper);
  border-top: var(--line-soft);
}
.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
  padding: 26px 20px 28px;
  background: rgba(247, 245, 240, .82);
  border: var(--line-hair);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}
.page-about .about-cta h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(21px, 5.4vw, 32px);
  line-height: 1.3;
  color: var(--ink-deep);
  margin: 10px 0 0;
  max-width: 22ch;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 700px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .timeline {
    grid-auto-columns: minmax(238px, 52%);
  }
  .page-about .about-row {
    padding: 56px 0 60px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    padding: 68px 0 72px;
  }
  .page-about .about-index {
    padding-top: 4px;
  }
  .page-about .about-hero {
    padding: 14px 0 64px;
  }
  .page-about .about-hero__inner {
    padding: 46px 44px 38px;
  }
  .page-about .timeline {
    grid-auto-columns: minmax(206px, 1fr);
    grid-auto-flow: initial;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 10px;
    overflow: visible;
    scroll-snap-type: none;
  }
  .page-about .tl-item {
    padding: 30px 13px 18px;
  }
  .page-about .tl-item__title {
    font-size: 17px;
  }
  .page-about .team-grid {
    grid-template-columns: 1.2fr .88fr .94fr 1.06fr;
    align-items: start;
    gap: 14px;
  }
  .page-about .team-card:nth-child(2) {
    margin-top: 34px;
  }
  .page-about .team-card:nth-child(3) {
    margin-top: 12px;
  }
  .page-about .team-card:nth-child(4) {
    margin-top: 48px;
  }
  .page-about .principle-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: end;
    padding: 36px 40px 38px;
  }
  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
  .page-about .about-figure {
    margin: 32px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .team-card,
  .page-about .link-card {
    transition: none;
  }
  .page-about .tl-item:hover,
  .page-about .team-card:hover,
  .page-about .link-card:hover {
    transform: none;
  }
}