.page-about {
  --about-rail: 26px;
  --about-gap: 104px;
  background: var(--ivory);
}

/* ---------- 面包屑 ---------- */
.page-about .about-trail {
  padding-top: clamp(16px, 2.4vw, 30px);
  padding-bottom: 4px;
}
.page-about .about-trail .breadcrumb {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}
.page-about .about-trail .breadcrumb-link {
  color: var(--score);
}
.page-about .about-trail .breadcrumb-item [aria-current="page"] {
  color: var(--felt);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(24px, 3.4vw, 48px) clamp(48px, 7vw, 96px);
}
.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}
.page-about .about-h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(2rem, 5.4vw, 4rem);
  line-height: 1.14;
  letter-spacing: 0.05em;
  color: var(--ink);
  max-width: 16em;
}
.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 30em;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.92;
  color: var(--ink);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}
.page-about .about-hero-fig {
  margin: 0;
  border: 2px solid var(--felt);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--felt);
}
.page-about .about-hero-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}
.page-about .about-hero-fig figcaption {
  padding: 10px 14px;
  background: var(--felt);
  color: var(--lamp);
}

/* ---------- 正文骨架：左轨 + 内容 ---------- */
.page-about .about-body {
  padding-block: clamp(56px, 7vw, 100px) clamp(64px, 9vw, 120px);
}
.page-about .about-flow {
  display: grid;
  gap: clamp(56px, 8vw, var(--about-gap));
}
.page-about .about-block {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 0 clamp(14px, 3vw, 34px);
}
.page-about .about-block::before {
  content: "";
  position: absolute;
  top: 24px;
  left: calc(var(--about-rail) / 2);
  width: 1px;
  bottom: calc(-1 * clamp(56px, 8vw, var(--about-gap)));
  background: var(--paper-line);
  transform: translateX(-1px);
}
.page-about .about-block:last-child::before {
  content: none;
}
.page-about .about-rail {
  position: relative;
}
.page-about .about-dot {
  position: absolute;
  top: 8px;
  left: calc(var(--about-rail) / 2);
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--felt);
  transform: translate(-50%, 0);
  z-index: 1;
}
.page-about .about-block-body {
  min-width: 0;
}
.page-about .about-block-body > .index-label {
  margin: 0 0 10px;
  color: var(--score);
}
.page-about .about-block-body > h2 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  color: var(--felt);
}
.page-about .about-text p {
  margin: 0 0 1em;
  max-width: 34em;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink);
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}
.page-about .num {
  font-family: var(--font-mono);
  font-size: 1.14em;
  letter-spacing: 0.04em;
  color: var(--gold);
  font-weight: 500;
}
.page-about .about-text .num {
  color: var(--chip);
}

/* ---------- 团队卡片 ---------- */
.page-about .about-team-cards {
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .about-team-card {
  width: 100%;
  box-sizing: border-box;
  background: var(--ivory-soft);
  border: 2px solid var(--felt);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 3vw, 30px);
  transition: transform 280ms ease, box-shadow 280ms ease;
}
.page-about .about-team-card:hover {
  transform: translate(3px, 3px);
  box-shadow: 3px 3px 0 rgba(14, 46, 38, 0.9);
}
.page-about .about-team-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}
.page-about .about-team-id {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--chip);
}
.page-about .about-team-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(1.15rem, 1.7vw, 1.4rem);
  letter-spacing: 0.02em;
  color: var(--felt);
}
.page-about .about-team-title .num {
  color: var(--chip);
}
.page-about .about-team-note {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--score);
}
.page-about .about-team-note .num {
  color: var(--chip);
}
.page-about .about-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-team-list li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .about-team-list .chip-dot {
  margin-top: 0.62em;
}
.page-about .about-team-list strong {
  font-weight: 600;
  color: var(--felt);
}
.page-about .about-team-list .num {
  color: var(--chip);
}

/* ---------- 工作台图片组 ---------- */
.page-about .about-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(32px, 4.6vw, 56px);
}
.page-about .about-fig {
  margin: 0;
  border: 2px solid var(--felt);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--felt);
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-fig:first-child img {
  aspect-ratio: 9 / 7;
}
.page-about .about-fig:last-child img {
  aspect-ratio: 10 / 6.2;
}
.page-about .about-fig figcaption {
  padding: 10px 14px;
  background: var(--felt);
  color: var(--lamp);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}
.page-about .about-stage {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 0 clamp(14px, 3vw, 34px);
  padding-bottom: clamp(28px, 4vw, 50px);
}
.page-about .about-stage:last-child {
  padding-bottom: 0;
}
.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: 22px;
  left: calc(var(--about-rail) / 2);
  width: 1px;
  bottom: 0;
  background: var(--paper-line);
  transform: translateX(-1px);
}
.page-about .about-stage:last-child::before {
  content: none;
}
.page-about .about-stage-mark {
  position: relative;
  display: block;
  width: 13px;
  height: 13px;
  margin-top: 8px;
  margin-left: calc(var(--about-rail) / 2);
  transform: translateX(-50%);
  border-radius: 50%;
  border: 2px solid var(--felt);
  background: var(--ivory);
  z-index: 1;
}
.page-about .about-stage--done .about-stage-mark {
  background: var(--gold);
}
.page-about .about-stage--now .about-stage-mark {
  background: transparent;
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(216, 162, 74, 0.18);
}
.page-about .about-stage-body {
  min-width: 0;
  border-left: 0;
  transition: background-color 280ms ease;
}
.page-about .about-stage:target .about-stage-body {
  background: var(--ivory-soft);
  box-shadow: inset 3px 0 0 var(--gold);
  padding: 14px 16px;
  border-radius: var(--radius);
}
.page-about .about-stage-body > .index-label {
  margin: 0 0 8px;
  color: var(--score);
}
.page-about .about-stage-title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
  letter-spacing: 0.02em;
  color: var(--felt);
}
.page-about .about-stage-body p {
  margin: 0;
  max-width: 34em;
  font-size: 0.97rem;
  line-height: 1.88;
  color: var(--ink);
}

/* ---------- 三道手 ---------- */
.page-about .about-checks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 2px solid var(--felt);
}
.page-about .about-check {
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-bottom: 1px solid var(--paper-line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}
.page-about .about-check-num {
  font-size: 0.86rem;
  letter-spacing: 0.18em;
  color: var(--chip);
}
.page-about .about-check-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--felt);
}
.page-about .about-check p {
  margin: 0;
  max-width: 34em;
  font-size: 0.97rem;
  line-height: 1.88;
  color: var(--ink);
}
.page-about .about-footnote {
  margin-top: clamp(26px, 3.6vw, 40px);
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  background: var(--ivory-soft);
  border: 1px solid var(--paper-line);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0 30px,
    rgba(201, 191, 168, 0.45) 30px 31px
  );
}
.page-about .about-footnote p {
  margin: 0;
  max-width: 34em;
  font-size: 0.97rem;
  line-height: 2.1;
  color: var(--ink);
}
.page-about .about-footnote .num {
  color: var(--chip);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding-block: clamp(72px, 10vw, 150px);
}
.page-about .about-outro .index-label--light {
  color: rgba(255, 249, 236, 0.72);
}
.page-about .about-outro-title {
  margin: 16px 0 0;
  max-width: 20em;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1.85rem, 4.6vw, 3.4rem);
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--lamp);
}
.page-about .about-outro-title .num {
  color: var(--gold);
}
.page-about .about-outro-text {
  margin: 22px 0 0;
  max-width: 32em;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.92;
  color: rgba(255, 249, 236, 0.86);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(40px, 6vw, 72px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--felt-line);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--gold);
}
.page-about .about-stat-label {
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  color: rgba(255, 249, 236, 0.72);
}
.page-about .about-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(36px, 5vw, 60px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-rail: 32px;
  }
  .page-about .about-workbench {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.28fr);
    align-items: start;
  }
  .page-about .about-check {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 6px clamp(16px, 2.4vw, 30px);
  }
  .page-about .about-check-num {
    grid-column: 1;
    padding-top: 0.28em;
  }
  .page-about .about-check-title {
    grid-column: 2;
  }
  .page-about .about-check p {
    grid-column: 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.24fr) minmax(0, 0.76fr);
  }
  .page-about .about-team-card:nth-child(1) {
    width: 76%;
  }
  .page-about .about-team-card:nth-child(2) {
    width: 88%;
  }
  .page-about .about-team-card:nth-child(3) {
    width: 100%;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-fig:first-child img {
    aspect-ratio: 9 / 7;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card {
    transition: none;
  }
  .page-about .about-team-card:hover {
    transform: none;
    box-shadow: var(--shadow-hard);
  }
  .page-about .about-stage-body {
    transition: none;
  }
}