.page-about {
  --about-rail: 186px;
  --about-ink-soft: rgba(255, 253, 249, 0.78);
  --about-ink-line: rgba(255, 253, 249, 0.16);
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(28px, 6vw, 68px)) 0 clamp(34px, 5vw, 60px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 150%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 55% at 78% 8%, rgba(255, 194, 75, 0.55), transparent 70%),
    radial-gradient(46% 46% at 8% 38%, rgba(31, 169, 138, 0.16), transparent 72%);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  max-width: 14em;
}

.page-about .about-hero .lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 33em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-hero__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--rule-soft);
}

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

.page-about .about-hero__k {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--sun-deep);
  background: var(--pale-gold);
  border-radius: 6px;
  padding: 2px 9px;
}

.page-about .about-hero__v {
  font-size: 14px;
  color: var(--slate);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-about .about-rail {
  margin-bottom: clamp(8px, 2vw, 20px);
}

.page-about .about-rail__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: none;
}

.page-about .about-rail__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper);
  color: var(--slate);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--sun-deep);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--sun-deep);
  border-color: var(--sun);
  transform: translateY(-2px);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(34px, 5.5vw, 76px) 0;
  border-top: 1px solid var(--rule-soft);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .about-chapter h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(25px, 3.6vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  max-width: 16em;
}

.page-about .about-chapter .prose {
  margin-top: clamp(16px, 2.6vw, 24px);
  max-width: 620px;
}

.page-about .about-chapter .prose p {
  margin: 0 0 1.15em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--slate);
}

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

.page-about .about-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(54px, 15vw, 124px);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: -0.05em;
  color: rgba(242, 118, 46, 0.22);
  margin-bottom: 6px;
}

/* ---------- 团队深色区 ---------- */
.page-about .about-chapter--ink {
  margin: clamp(16px, 3vw, 30px) 0;
  padding: clamp(26px, 4.5vw, 52px) clamp(20px, 3.6vw, 46px);
  border-top: 0;
  border-radius: clamp(18px, 2.6vw, 28px);
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-chapter--ink h2 {
  color: var(--paper);
}

.page-about .about-chapter--ink .eyebrow {
  color: var(--gold);
}

.page-about .about-chapter--ink .prose p {
  color: var(--about-ink-soft);
}

.page-about .about-roles {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-role {
  padding: 16px 18px;
  border: 1px solid var(--about-ink-line);
  border-radius: 16px;
  background: rgba(255, 253, 249, 0.06);
}

.page-about .about-role__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-role__t {
  display: block;
  margin-top: 4px;
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-role__d {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(255, 253, 249, 0.7);
}

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-about .about-split .prose {
  margin-top: 0;
  max-width: 620px;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  border-radius: 18px;
  overflow: hidden;
  background: var(--sand-deep);
}

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

.page-about .about-figure__cap {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  max-width: 440px;
  margin: 0;
  padding: 11px 15px;
  border-radius: 12px;
  border: 1px solid rgba(255, 253, 249, 0.6);
  background: rgba(255, 253, 249, 0.88);
  backdrop-filter: blur(8px);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-split .about-figure {
  margin-top: 0;
}

/* ---------- 数字带 ---------- */
.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-stats li {
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--rule);
  background: var(--paper);
}

.page-about .about-stats__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--sun-deep);
}

.page-about .about-stats__l {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0 0 0 24px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), var(--sun) 48%, var(--jade));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sun);
  box-shadow: 0 0 0 4px var(--sand);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--sun-deep);
}

.page-about .about-timeline__body {
  margin-top: 4px;
  max-width: 600px;
}

.page-about .about-timeline__body h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__body p {
  margin: 6px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 结尾指引 ---------- */
.page-about .about-next {
  padding: clamp(34px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
  border-top: 1px solid var(--rule-soft);
}

.page-about .about-next h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 34px);
  letter-spacing: -0.02em;
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-next__card {
  display: block;
  padding: 18px 20px;
  border-radius: 16px;
  border: 1px solid var(--rule);
  background: var(--paper);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 240ms var(--ease), transform 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--sun);
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(20, 32, 58, 0.08);
}

.page-about .about-next__t {
  display: block;
  font-weight: 700;
  font-size: 16.5px;
  color: var(--sun-deep);
}

.page-about .about-next__d {
  display: block;
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-figure__cap {
    left: clamp(14px, 2vw, 22px);
    bottom: clamp(14px, 2vw, 22px);
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    margin-bottom: 0;
  }

  .page-about .about-rail__inner {
    display: block;
    overflow: visible;
    padding: 6px 0 6px 18px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-rail__inner::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--gold), var(--sun) 46%, var(--jade));
  }

  .page-about .about-rail__link {
    padding: 6px 0;
    margin-bottom: 14px;
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
  }

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

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    transform: translateX(3px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    align-items: center;
  }

  .page-about .about-split .about-figure--offset {
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}