.page-about {
  --about-card: #ffffff;
  --about-line: rgba(11, 34, 57, 0.08);
  background: var(--c-white);
  color: var(--c-ink);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 4vw, 40px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-slate);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-mist);
}

.page-about .breadcrumb__list a {
  color: var(--c-slate);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.page-about .breadcrumb__list a:hover {
  color: var(--c-green);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(36px, 6vw, 72px);
}

.page-about .eyebrow {
  display: block;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-slate);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 5.6vw, 3.9rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-deep);
}

.page-about .about-hero__lead .lede {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  line-height: 1.8;
  color: var(--c-ink);
}

.page-about .about-hero__note {
  margin: 0 0 26px;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 3px solid var(--c-green);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--c-slate);
}

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

.page-about .about-hero__actions .btn {
  text-decoration: none;
}

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

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--about-card);
}

.page-about .about-stat__num {
  font-family: var(--font-num);
  font-size: clamp(1.9rem, 4.6vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-deep);
}

.page-about .about-stat:nth-child(2) .about-stat__num {
  color: var(--c-orange);
}

.page-about .about-stat__label {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--c-slate);
}

.page-about .about-hero__figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  padding-top: clamp(28px, 5vw, 64px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

/* ---------- 左栏索引 ---------- */
.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-slate);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-rail__link {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--c-mist);
  background: var(--about-card);
  color: var(--c-ink);
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-green);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-rail__name {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

.page-about .about-rail__note {
  display: none;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--c-green);
  background: var(--c-mist);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3vw, 36px);
  min-width: 0;
}

.page-about .about-chapter {
  border-radius: var(--radius-lg);
  padding: clamp(26px, 4vw, 52px);
  background: var(--about-card);
  border: 1px solid var(--c-mist);
  scroll-margin-top: 110px;
}

.page-about .about-chapter--deep {
  background: var(--c-deep);
  border-color: transparent;
  color: var(--c-white);
}

.page-about .about-chapter--teal {
  background: var(--c-teal);
  border-color: transparent;
  color: var(--c-white);
}

.page-about .about-chapter--indigo {
  background: var(--c-indigo);
  border-color: transparent;
  color: var(--c-white);
}

.page-about .about-chapter__index {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-slate);
}

.page-about .about-chapter--deep .about-chapter__index,
.page-about .about-chapter--teal .about-chapter__index,
.page-about .about-chapter--indigo .about-chapter__index {
  color: rgba(245, 247, 244, 0.62);
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-deep);
}

.page-about .about-chapter--deep h2,
.page-about .about-chapter--teal h2,
.page-about .about-chapter--indigo h2 {
  color: var(--c-white);
}

.page-about .about-chapter__lede {
  margin: 0 0 22px;
  max-width: 64ch;
  font-size: clamp(1rem, 1.4vw, 1.08rem);
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-chapter--deep .about-chapter__lede,
.page-about .about-chapter--teal .about-chapter__lede,
.page-about .about-chapter--indigo .about-chapter__lede {
  color: rgba(245, 247, 244, 0.88);
}

.page-about .about-chapter__sub {
  margin: clamp(26px, 4vw, 40px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-slate);
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1em;
  font-size: 0.98rem;
  line-height: 1.9;
  color: inherit;
}

.page-about .about-chapter--deep .about-prose p,
.page-about .about-chapter--teal .about-prose p,
.page-about .about-chapter--indigo .about-prose p {
  color: rgba(245, 247, 244, 0.86);
}

.page-about .about-chapter__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .about-quote {
  margin: 0;
  padding: 24px 26px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--c-orange);
  background: rgba(245, 247, 244, 0.08);
}

.page-about .about-quote p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 247, 244, 0.9);
}

/* ---------- 团队卡片 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .team-card {
  position: relative;
  padding: 26px 22px 26px 30px;
  border-radius: var(--radius-lg);
  background: var(--about-card);
  border: 1px solid var(--c-mist);
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 4px;
  border-radius: var(--pill);
  background: var(--c-green);
  transition: background var(--t-fast) var(--ease);
}

.page-about .team-card:nth-child(2)::before {
  background: var(--c-orange);
}

.page-about .team-card:nth-child(3)::before {
  background: var(--c-indigo);
}

.page-about .team-card:nth-child(4)::before {
  background: var(--c-wine);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
  border-color: var(--c-green);
}

.page-about .team-card__meta {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-slate);
}

.page-about .team-card h3 {
  margin: 0 0 10px;
  font-size: 1.06rem;
  line-height: 1.4;
  font-weight: 800;
  color: var(--c-deep);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--c-ink);
}

/* ---------- 三步更新节奏 ---------- */
.page-about .about-chapter__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-step {
  position: relative;
  padding: 20px 20px 20px 66px;
  border-radius: var(--radius-md);
  background: rgba(245, 247, 244, 0.06);
  border: 1px solid rgba(245, 247, 244, 0.16);
}

.page-about .about-step__no {
  position: absolute;
  left: 20px;
  top: 20px;
  font-family: var(--font-num);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--c-white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(245, 247, 244, 0.82);
}

.page-about .about-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(245, 247, 244, 0.16);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

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

/* ---------- 档案条目清单 ---------- */
.page-about .about-ledger {
  margin: clamp(16px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-ledger__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 6px;
  border-bottom: 1px solid var(--c-mist);
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-ledger__row:first-child {
  border-top: 1px solid var(--c-mist);
}

.page-about .about-ledger__row:hover {
  background: rgba(31, 122, 76, 0.07);
}

.page-about .about-ledger dt {
  font-size: 1rem;
  font-weight: 800;
  color: var(--c-deep);
}

.page-about .about-ledger dd {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--c-ink);
}

/* ---------- 胶囊标签墙 ---------- */
.page-about .about-tags {
  list-style: none;
  margin: clamp(16px, 3vw, 26px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-tags li {
  padding: 9px 18px;
  border-radius: var(--pill);
  border: 1px solid var(--c-mist);
  background: var(--about-card);
  font-size: 0.84rem;
  color: var(--c-deep);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-chapter--indigo .about-tags li {
  background: rgba(245, 247, 244, 0.08);
  border-color: rgba(245, 247, 244, 0.24);
  color: rgba(245, 247, 244, 0.92);
}

.page-about .about-tags li:hover {
  background: var(--c-green);
  border-color: var(--c-green);
  color: var(--c-white);
}

.page-about .about-chapter--indigo .about-tags li:hover {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: #ffffff;
}

.page-about .about-tags--awards li:hover {
  background: var(--c-deep);
  border-color: var(--c-deep);
  color: var(--c-white);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  padding: clamp(28px, 4vw, 52px);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--c-deep) 10%, var(--c-teal) 78%);
  color: var(--c-white);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  line-height: 1.26;
  font-weight: 800;
  color: var(--c-white);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 42ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(245, 247, 244, 0.78);
}

.page-about .about-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-cta__links a {
  display: block;
  padding: 15px 18px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(245, 247, 244, 0.22);
  color: var(--c-white);
  font-size: 0.98rem;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-cta__links a span {
  display: block;
  margin-top: 5px;
  font-size: 0.82rem;
  font-weight: 400;
  line-height: 1.6;
  color: rgba(245, 247, 244, 0.7);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  background: rgba(245, 247, 244, 0.1);
  border-color: var(--c-green);
  transform: translateY(-2px);
}

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

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

@media (min-width: 760px) {
  .page-about .about-ledger__row {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-chapter__split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-chapter__split--media-left {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-body__grid {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 8px 0 8px 18px;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 14px;
    bottom: 14px;
    width: 2px;
    background: repeating-linear-gradient(to bottom, var(--c-mist) 0 8px, transparent 8px 18px);
  }

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

  .page-about .about-rail__link {
    border-color: transparent;
    background: transparent;
    border-radius: var(--radius-sm);
    padding: 8px 12px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: var(--c-mist);
    border-color: transparent;
  }

  .page-about .about-rail__link:hover .about-rail__no,
  .page-about .about-rail__link:focus-visible .about-rail__no {
    color: var(--c-orange);
  }

  .page-about .about-rail__name {
    display: block;
    white-space: normal;
  }

  .page-about .about-rail__note {
    display: block;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    font-size: 0.76rem;
    line-height: 1.65;
    color: var(--c-slate);
    transition: max-height var(--t-mid) var(--ease), opacity var(--t-mid) var(--ease);
  }

  .page-about .about-rail__link:hover .about-rail__note,
  .page-about .about-rail__link:focus-visible .about-rail__note {
    max-height: 6em;
    opacity: 1;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: center;
  }
}

@media (min-width: 1120px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-card:nth-child(1) {
    margin-top: 0;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 42px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 14px;
  }

  .page-about .team-card:nth-child(4) {
    margin-top: 56px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-chapter__cols {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-rail__note,
  .page-about .about-rail__link,
  .page-about .about-cta__links a {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .about-cta__links a:hover {
    transform: none;
  }
}