.page-about {
  background: var(--ink);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(20px, 4vw, 38px) 0 clamp(36px, 7vw, 74px);
  background:
    radial-gradient(110% 90% at 8% 0%, rgba(31, 214, 95, .18), transparent 55%),
    radial-gradient(80% 70% at 96% 4%, rgba(255, 201, 74, .16), transparent 60%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 74%);
  border-bottom: 1px solid var(--gold-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: auto -12% -58% 52%;
  height: 92%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(77, 216, 224, .22), transparent 72%);
  pointer-events: none;
}

.page-about .crumbs {
  margin-bottom: clamp(18px, 4vw, 32px);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .crumbs li + li::before {
  content: "/";
  color: rgba(230, 238, 245, .28);
}

.page-about .crumbs a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color .18s ease;
}

.page-about .crumbs a:hover {
  color: var(--grass);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--text-light);
}

.page-about .about-hero .eyebrow {
  color: var(--grass);
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  max-width: 20ch;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-size: clamp(36px, 8vw, 82px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -.025em;
  color: var(--text-light);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  margin: 0 0 clamp(26px, 4vw, 42px);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .045);
  border: 1px solid var(--line-light);
  backdrop-filter: blur(8px);
}

.page-about .about-fact__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-size: clamp(26px, 4.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-fact__label {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ===== 主布局：目录 + 正文 ===== */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: clamp(30px, 6vw, 62px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-toc {
  min-width: 0;
  padding: 14px;
  border-radius: var(--r-md);
  background: rgba(19, 31, 51, .74);
  border: 1px solid var(--line-light);
  border-left: 2px solid var(--gold-line);
  backdrop-filter: blur(10px);
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .toc-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease;
}

.page-about .toc-link__num {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-about .toc-link:hover {
  color: var(--text-light);
  background: rgba(255, 255, 255, .05);
}

.page-about .toc-link.is-active {
  color: var(--ink);
  background: var(--grass);
}

.page-about .toc-link.is-active .toc-link__num {
  color: var(--ink);
}

.page-about .about-flow {
  min-width: 0;
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  scroll-margin-top: 120px;
}

.page-about .about-section + .about-section {
  margin-top: clamp(44px, 7vw, 84px);
  padding-top: clamp(34px, 6vw, 62px);
  border-top: 1px dashed rgba(255, 201, 74, .24);
}

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-section__num {
  padding: 4px 9px;
  border-radius: var(--r-sm);
  border: 1px solid var(--gold-line);
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-section__title {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 24ch;
  margin: 0;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--text-light);
}

.page-about .about-text {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-light);
}

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

.page-about .about-hl {
  font-weight: 700;
  color: var(--grass);
}

.page-about .about-inline-link {
  color: var(--grass);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--grass-line);
}

.page-about .about-inline-link:hover {
  color: var(--gold);
}

.page-about .about-duo {
  display: grid;
  gap: 24px;
}

.page-about .about-duo__text {
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure .media-frame {
  display: block;
  overflow: hidden;
  border-radius: var(--r-lg);
}

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

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ===== 时间轴 ===== */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  margin-top: 20px;
  padding: clamp(20px, 4vw, 34px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-light);
  background: linear-gradient(180deg, rgba(19, 31, 51, .92), rgba(11, 18, 32, .92));
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: .22;
  pointer-events: none;
}

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

.page-about .about-timeline__rail {
  position: relative;
  z-index: 1;
  display: none;
  width: 100%;
  height: 26px;
  margin-bottom: 18px;
}

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

.page-about .about-timeline__list > li {
  display: flex;
  min-width: 0;
}

.page-about .tl-card {
  flex: 1 1 auto;
  min-width: 0;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line-light);
  transition: background-color .2s ease, border-color .2s ease;
}

.page-about .tl-card[open] {
  background: rgba(31, 214, 95, .09);
  border-color: var(--grass-line);
}

.page-about .tl-card summary {
  position: relative;
  display: block;
  padding: 16px 40px 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: var(--r-md);
}

.page-about .tl-card__stage {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .tl-card__title {
  display: block;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-light);
}

.page-about .tl-card__more {
  position: absolute;
  top: 14px;
  right: 14px;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--gold-line);
  font-family: var(--font-num);
  font-size: 13px;
  line-height: 1;
  color: var(--gold);
}

.page-about .tl-card__more::after {
  content: "+";
}

.page-about .tl-card[open] .tl-card__more::after {
  content: "\2212";
}

.page-about .tl-card__body {
  padding: 0 16px 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ===== 团队 ===== */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card {
  min-width: 0;
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(19, 31, 51, .96), rgba(11, 18, 32, .96));
  border: 1px solid var(--line-light);
  border-top: 2px solid var(--grass);
}

.page-about .team-card--mid {
  border-top-color: var(--gold);
}

.page-about .team-card--wide {
  border-top-color: var(--cyan);
}

.page-about .team-card__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-num);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--grass);
}

.page-about .team-card--mid .team-card__num {
  color: var(--gold);
}

.page-about .team-card--wide .team-card__num {
  color: var(--cyan);
}

.page-about .team-card__role {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-light);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ===== 生产流程 ===== */
.page-about .flow-steps {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-light);
}

.page-about .flow-step {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 2px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .flow-step__idx {
  flex: none;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: var(--grass);
}

.page-about .flow-step__main {
  min-width: 0;
}

.page-about .flow-step__title {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-light);
}

.page-about .flow-step__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ===== 合作生态 ===== */
.page-about .partner-grid {
  display: grid;
  gap: 22px;
}

.page-about .partner-text {
  min-width: 0;
}

/* ===== 服务与纠错 ===== */
.page-about .support-board {
  padding: clamp(20px, 4vw, 34px);
  border-radius: var(--r-lg);
  background: rgba(31, 214, 95, .08);
  border: 1px solid var(--grass-line);
}

.page-about .support-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .support-item {
  min-width: 0;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line-light);
}

.page-about .support-item__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-light);
}

.page-about .support-item__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ===== 中等屏幕 ===== */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .support-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .about-duo {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: 38px;
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team-card--lead {
    grid-column: span 7;
  }

  .page-about .team-card--mid {
    grid-column: span 5;
  }

  .page-about .team-card--wide {
    grid-column: span 12;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__rail {
    display: block;
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ===== 桌面：左侧粘性目录 ===== */
@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 62px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 112px;
    max-height: calc(100vh - 150px);
    overflow-y: auto;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link,
  .page-about .tl-card,
  .page-about .crumbs a {
    transition: none;
  }
}
</main>