.page-about {
  --about-gap: clamp(28px, 4vw, 48px);
  --about-panel-pad: clamp(20px, 3.6vw, 40px);
  --about-rail-top: 92px;
  display: block;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -34%;
  width: 72%;
  height: 168%;
  background: radial-gradient(circle at 50% 40%, rgba(255, 210, 74, 0.16), rgba(255, 210, 74, 0) 62%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 12px 0 0;
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  overflow: hidden;
}

.page-about .about-hero__stats > div {
  background: rgba(12, 28, 51, 0.78);
  padding: 16px 16px 18px;
}

.page-about .about-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .about-hero__stats dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 38px);
  line-height: 1;
  color: var(--whistle);
}

.page-about .about-hero__stats dd small {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0;
  color: var(--text-dim);
}

/* ---------- 布局骨架 ---------- */
.page-about .about-layout {
  margin-top: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

/* ---------- 左侧章节色带 ---------- */
.page-about .about-rail {
  border-top: 2px solid var(--whistle);
  padding-top: 14px;
  min-width: 0;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-about .about-rail__band {
  display: flex;
  gap: 3px;
  height: 6px;
  margin-bottom: 16px;
}

.page-about .about-rail__seg {
  flex: 1 1 0;
  border-radius: 999px;
  background: var(--line);
}

.page-about .about-rail__seg:nth-child(1) { background: var(--whistle); }
.page-about .about-rail__seg:nth-child(2) { background: var(--turf); }
.page-about .about-rail__seg:nth-child(3) { background: var(--whistle-lift); }
.page-about .about-rail__seg:nth-child(4) { background: var(--turf); }
.page-about .about-rail__seg:nth-child(5) { background: var(--score-red); }
.page-about .about-rail__seg:nth-child(6) { background: var(--whistle); }
.page-about .about-rail__seg:nth-child(7) { background: var(--line); }

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding-right: 14px;
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-rail__list a .mono {
  font-size: 11px;
  color: var(--whistle);
  letter-spacing: 0.08em;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--whistle);
}

.page-about .about-rail__foot {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 30ch;
}

/* ---------- 堆叠面板 ---------- */
.page-about .about-block {
  position: relative;
  min-width: 0;
  padding: var(--about-panel-pad);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  background: linear-gradient(180deg, rgba(27, 47, 58, 0.62), rgba(12, 28, 51, 0.5));
  box-shadow: 10px 12px 0 rgba(0, 0, 0, 0.2);
}

.page-about .about-block + .about-block {
  margin-left: 0;
}

.page-about .about-block h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 38px);
  line-height: 1.16;
  color: var(--text);
  margin: 10px 0 0;
  max-width: 22ch;
}

.page-about .about-block h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.3;
  color: var(--text);
  margin: 8px 0 0;
}

.page-about .section__index {
  color: var(--text-dim);
  transition: color 0.2s var(--ease);
}

.page-about [data-section].is-current .section__index {
  color: var(--whistle);
}

.page-about .about-block .section__head {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-block .prose p {
  line-height: 1.85;
  color: var(--text);
  margin: 0 0 1.2em;
  max-width: 68ch;
}

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

/* ---------- 场景卡片 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-scene {
  padding: 20px 20px 22px;
  border-left: 3px solid var(--turf);
  border-radius: 4px;
}

.page-about .about-scene:last-child {
  border-left-color: var(--whistle);
}

.page-about .about-scene p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 数据源索引 ---------- */
.page-about .source-index {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .source-index li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  color: var(--text);
}

.page-about .source-index li .mono {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--whistle);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

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

.page-about .about-figure .media-frame__label {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* ---------- 三条产品线 ---------- */
.page-about .line-cards {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .line-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: 20px 20px 22px;
  border-radius: 4px;
  background: rgba(12, 28, 51, 0.66);
  border-top: 3px solid var(--whistle);
}

.page-about .line-card--stack { border-top-color: var(--turf); }
.page-about .line-card--read { border-top-color: var(--whistle-lift); }

.page-about .line-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .line-card__link {
  margin-top: auto;
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--whistle);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 210, 74, 0.4);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .line-card__link:hover,
.page-about .line-card__link:focus-visible {
  color: var(--whistle-lift);
  border-bottom-color: var(--whistle-lift);
}

/* ---------- 团队分工条形 ---------- */
.page-about .team-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 12px;
}

.page-about .team-row__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
}

.page-about .team-row__count {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--whistle);
}

.page-about .team-row__track {
  grid-column: 1 / -1;
  height: 10px;
  border-radius: 999px;
  background: rgba(42, 70, 64, 0.55);
  overflow: hidden;
}

.page-about .team-row__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--turf), var(--whistle));
  transition: filter 0.18s var(--ease);
}

.page-about .team-row__fill--1 { width: 100%; }
.page-about .team-row__fill--2 { width: 83%; }
.page-about .team-row__fill--3 { width: 75%; }
.page-about .team-row__fill--4 { width: 67%; }
.page-about .team-row__fill--5 { width: 58%; }

.page-about .team-row__duty {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .team-row:hover .team-row__fill {
  filter: brightness(1.18);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .fact-grid {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .fact-grid li {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--turf);
  border-radius: 4px;
  background: rgba(8, 32, 28, 0.46);
}

.page-about .fact-grid__k {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--whistle);
}

.page-about .fact-grid p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 合作流程 ---------- */
.page-about .partner-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
}

.page-about .partner-flow__step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  min-height: 44px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(12, 28, 51, 0.6);
  font-size: 13px;
  color: var(--text);
}

.page-about .partner-flow__step .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--whistle);
}

.page-about .partner-flow__cta {
  margin-top: 22px;
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: var(--about-panel-pad);
  border-radius: 6px;
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: 10px 12px 0 rgba(0, 0, 0, 0.22);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.8vw, 34px);
  line-height: 1.18;
  color: var(--paper-ink);
  max-width: 24ch;
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta .btn--ghost {
  color: var(--paper-ink);
  border-color: rgba(11, 31, 26, 0.3);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--paper-ink);
  color: var(--paper-ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .source-index {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 4vw, 48px);
  }

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

  .page-about .about-hero__stats > div {
    padding: 18px 20px 20px;
  }
}

@media (min-width: 820px) {
  .page-about .line-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 60px);
  }
}

@media (min-width: 960px) {
  .page-about .grid--split.about-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    width: 100%;
    padding-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .about-block + .about-block {
    margin-left: 14px;
  }

  .page-about .about-cta {
    margin-left: 14px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .team-row__fill,
  .page-about .line-card__link,
  .page-about .section__index {
    transition: none;
  }
}