.page-about {
  --about-track-w: 236px;
  --about-pad: clamp(1.15rem, 2.6vw, 2rem);
  --about-gap: clamp(1.1rem, 2.6vw, 1.9rem);
  --about-radius: var(--radius-lg);
  background:
    radial-gradient(70% 45% at 100% 0%, rgba(255, 106, 42, 0.08), transparent 62%),
    radial-gradient(60% 40% at 0% 30%, rgba(57, 242, 200, 0.05), transparent 65%),
    var(--coal);
  color: var(--paper);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  overflow-x: clip;
}

.page-about a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 1.1rem;
  padding-bottom: 0.35rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 3.5vw, 2.25rem) 0 clamp(2.25rem, 5vw, 3.5rem);
  background:
    radial-gradient(110% 85% at 88% -25%, rgba(57, 242, 200, 0.2), transparent 60%),
    radial-gradient(95% 75% at -10% 5%, rgba(255, 106, 42, 0.18), transparent 58%),
    linear-gradient(180deg, var(--ink) 0%, var(--coal) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 5.2vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0;
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin-top: clamp(0.85rem, 2vw, 1.15rem);
  max-width: 62ch;
  color: var(--paper);
  opacity: 0.88;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-stat {
  position: relative;
  padding: 0.85rem 0.95rem 0.9rem 1.05rem;
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(22, 59, 48, 0.92), rgba(15, 42, 34, 0.7));
  border: 1px solid var(--line-soft);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85rem;
  bottom: 0.85rem;
  width: 3px;
  border-radius: var(--pill);
  background: var(--orange);
}

.page-about .about-stat:nth-child(2n)::before {
  background: var(--cyan);
}

.page-about .about-stat__n {
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 4.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-stat__u {
  font-size: 0.55em;
  margin-left: 0.1em;
  color: var(--cyan);
}

.page-about .about-stat__l {
  font-size: 0.8125rem;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .about-hero__tags {
  margin-top: 1.1rem;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(1.75rem, 4.5vw, 3rem);
}

/* ---------- 章节轨道 ---------- */
.page-about .about-track {
  background: linear-gradient(160deg, var(--stand), var(--ink));
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: 1rem 1rem 1.05rem;
  min-width: 0;
}

.page-about .about-track__title {
  margin: 0 0 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-track__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.25rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-track__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.4rem 0.85rem;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: rgba(11, 15, 14, 0.45);
  font-size: 0.875rem;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-about .about-track__no {
  font-family: var(--font-num);
  font-size: 0.95rem;
  color: var(--cyan);
}

.page-about .about-track__list a:hover,
.page-about .about-track__list a:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(57, 242, 200, 0.1);
}

.page-about .about-track__foot {
  display: none;
  margin-top: 1rem;
  padding-top: 0.95rem;
  border-top: 1px dashed var(--line);
}

.page-about .about-track__foot p {
  margin: 0 0 0.6rem;
  font-size: 0.8125rem;
  color: var(--mist);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  background: linear-gradient(180deg, rgba(15, 42, 34, 0.96), rgba(11, 15, 14, 0.96));
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: var(--about-pad);
  scroll-margin-top: calc(var(--header-h) + 1.25rem);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding-bottom: 1rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-chapter__no {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 0.9;
  color: var(--orange);
  opacity: 0.9;
}

.page-about .about-chapter__kicker {
  margin: 0 0 0.3rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__lead {
  margin: 0 0 1.15rem;
  max-width: 62ch;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-chapter p {
  line-height: 1.78;
}

.page-about .about-split {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-split__text p {
  margin: 0 0 0.9rem;
  color: rgba(244, 247, 242, 0.86);
}

.page-about .about-split__text a,
.page-about .about-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-split__text a:hover,
.page-about .about-note a:hover {
  color: var(--orange);
}

/* ---------- 图片 ---------- */
.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(160deg, var(--stand), var(--coal));
}

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

.page-about .media-frame__caption {
  padding: 0.6rem 0.85rem 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-figure {
  margin-top: 1.3rem;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0 0 0 1.3rem;
  border-left: 2px solid var(--line-cyan);
  display: grid;
  gap: 1.1rem;
}

.page-about .about-timeline li {
  position: relative;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: calc(-1.3rem - 5px);
  top: 0.5rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(57, 242, 200, 0.14);
}

.page-about .about-timeline li:nth-child(2)::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 181, 71, 0.14);
}

.page-about .about-timeline li:nth-child(3)::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, 0.16);
}

.page-about .about-timeline h3 {
  margin: 0 0 0.3rem;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 团队角色卡 ---------- */
.page-about .about-team {
  display: grid;
  gap: 0.75rem;
}

.page-about .role-card {
  background: var(--stand);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .role-card[open] {
  border-color: var(--line-cyan);
  background: linear-gradient(160deg, var(--stand), rgba(15, 42, 34, 0.92));
}

.page-about .role-card > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.8rem;
  min-height: 44px;
  padding: 0.9rem 1rem;
  cursor: pointer;
  list-style: none;
}

.page-about .role-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .role-card > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.3rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .role-card[open] > summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .role-card > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .role-card__name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .role-card__count {
  font-family: var(--font-num);
  font-size: 1.05rem;
  color: var(--orange);
}

.page-about .role-card__tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  width: 100%;
}

.page-about .role-card__body {
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--line-soft);
  margin-top: 0.15rem;
}

.page-about .role-card__body p {
  margin: 0.85rem 0 0;
  font-size: 0.9375rem;
  color: rgba(244, 247, 242, 0.84);
  line-height: 1.78;
}

/* ---------- 六类档案 ---------- */
.page-about .about-dossiers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-dossiers li {
  position: relative;
  padding: 0.9rem 1rem 0.95rem 1.1rem;
  border-radius: var(--radius-sm);
  background: rgba(22, 59, 48, 0.62);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .about-dossiers li:nth-child(2n) {
  border-left-color: var(--orange);
}

.page-about .about-dossiers li:nth-child(3n) {
  border-left-color: var(--amber);
}

.page-about .about-dossiers li:hover {
  background: rgba(22, 59, 48, 0.86);
  transform: translateY(-2px);
}

.page-about .about-dossiers h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .about-dossiers p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-note {
  margin: 1.15rem 0 0;
  padding: 0.8rem 0.95rem;
  border-radius: var(--radius-sm);
  background: rgba(57, 242, 200, 0.07);
  border: 1px dashed var(--line-cyan);
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(244, 247, 242, 0.86);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-rhythm li {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  background: rgba(22, 59, 48, 0.68);
  border: 1px solid var(--line-soft);
}

.page-about .about-rhythm strong {
  font-family: var(--font-num);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--orange);
}

.page-about .about-rhythm span {
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 服务与合作 ---------- */
.page-about .about-trust {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-trust__item {
  padding: 1rem 1.05rem 1.1rem;
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, rgba(22, 59, 48, 0.9), rgba(11, 15, 14, 0.85));
  border: 1px solid var(--line);
}

.page-about .about-trust__item h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--cyan);
}

.page-about .about-trust__item p {
  margin: 0 0 0.7rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.84);
}

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

.page-about .about-cta {
  margin-top: 1.3rem;
  padding: 1.15rem 1.1rem 1.2rem;
  border-radius: var(--radius-md);
  background:
    linear-gradient(115deg, rgba(255, 106, 42, 0.16), rgba(57, 242, 200, 0.08)),
    var(--deep-ink);
  border: 1px solid var(--line-orange);
}

.page-about .about-cta p {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-trust__item:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 1.5rem;
  }

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

  .page-about .role-card__tags {
    width: auto;
  }

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

  .page-about .about-trust__item:first-child {
    grid-column: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-track-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .about-track {
    position: sticky;
    top: calc(var(--header-h) + 1.1rem);
  }

  .page-about .about-track__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 0.35rem;
  }

  .page-about .about-track__list a {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--radius-sm);
    border-color: transparent;
    background: transparent;
    padding: 0.3rem 0.55rem;
  }

  .page-about .about-track__list a:hover,
  .page-about .about-track__list a:focus-visible {
    border-color: var(--line-cyan);
    background: rgba(57, 242, 200, 0.09);
  }

  .page-about .about-track__foot {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-dossiers li,
  .page-about .role-card,
  .page-about .about-track__list a {
    transition: none;
  }

  .page-about .about-dossiers li:hover {
    transform: none;
  }
}