.page-about {
  --about-aside: 208px;
  --about-sec-pad: clamp(52px, 8vw, 104px);
  background:
    radial-gradient(120% 70% at 92% 2%, rgba(255, 122, 61, .10), transparent 60%),
    var(--ink-900);
  color: var(--ivory);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 28px);
  font-size: 12.5px;
  letter-spacing: .04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 86px) 0 clamp(28px, 4vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -16%;
  width: min(620px, 84vw);
  height: min(620px, 84vw);
  background: radial-gradient(circle at 34% 34%, rgba(43, 224, 200, .16), transparent 62%);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -46%;
  width: min(520px, 76vw);
  height: min(520px, 76vw);
  background: linear-gradient(140deg, rgba(255, 122, 61, .16), rgba(255, 194, 75, .05) 58%, transparent 76%);
  border-radius: 58% 42% 46% 54% / 46% 54% 46% 54%;
  pointer-events: none;
}

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

.page-about .about-kicker {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.2vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 56ch;
  font-size: clamp(15.5px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: rgba(244, 241, 232, .84);
}

.page-about .about-hero__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
}

/* ---------- 章节锚点条 ---------- */
.page-about .about-jump {
  position: sticky;
  top: 0;
  z-index: 8;
  background: rgba(7, 26, 47, .9);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-jump__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 11px;
  padding-bottom: 11px;
  scrollbar-width: none;
}

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

.page-about .about-jump__inner a {
  flex: 0 0 auto;
  padding: 7px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(244, 241, 232, .78);
  transition: color .18s ease, background .18s ease, border-color .18s ease;
}

.page-about .about-jump__inner a:hover,
.page-about .about-jump__inner a:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: var(--about-sec-pad) 0;
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 34px);
}

.page-about .about-sec__aside {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-sec__num {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.4vw, 54px);
  font-weight: 900;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: transparent;
  -webkit-text-stroke: 1px var(--mist);
}

.page-about .about-sec__label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--mist);
}

.page-about .about-sec__body h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.24;
  color: var(--ivory);
}

.page-about .about-sec__body > p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 241, 232, .8);
}

/* ---------- 时间轴上方通栏图 ---------- */
.page-about .about-band {
  margin: 0 0 clamp(30px, 4.6vw, 52px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: clamp(190px, 30vw, 380px);
  object-fit: cover;
  opacity: .9;
}

/* ---------- 团队标签页 ---------- */
.page-about .about-tabs {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-tabs .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border: 0;
  padding: 0;
}

.page-about .about-tabs .tab {
  padding: 9px 19px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  background: transparent;
  color: rgba(244, 241, 232, .76);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.page-about .about-tabs .tab:hover {
  border-color: var(--cyan);
  color: var(--ivory);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .about-tabs .tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-tabs .tab-panel {
  margin-top: 20px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .panel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .panel-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 241, 232, .84);
}

.page-about .panel-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .media-caption {
  padding: 12px 16px 15px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 值守节奏 ---------- */
.page-about .rhythm {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .rhythm__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .rhythm__row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm__time {
  justify-self: start;
  padding: 4px 12px;
  border: 1px solid rgba(255, 194, 75, .34);
  border-radius: var(--pill);
  background: rgba(255, 194, 75, .10);
  font-family: var(--font-display);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .rhythm__label {
  display: block;
  margin-bottom: 4px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .rhythm__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .72);
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3.4vw, 28px);
}

.page-about .timeline__node {
  position: relative;
  padding-left: 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .timeline__sum {
  display: block;
  list-style: none;
  cursor: pointer;
  padding: 0 0 10px;
}

.page-about .timeline__sum::-webkit-details-marker {
  display: none;
}

.page-about .timeline__sum:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.page-about .timeline__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(44px, 9vw, 92px);
  font-weight: 900;
  line-height: .88;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .timeline__name {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ivory);
}

.page-about .timeline__item[open] .timeline__name {
  color: var(--cyan);
}

.page-about .timeline__desc {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 241, 232, .76);
}

/* ---------- 说明库索引 ---------- */
.page-about .faq-index {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .faq-index__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  padding: clamp(14px, 2.2vw, 20px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .faq-index__num {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .faq-index__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .faq-index__desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 协作引句 ---------- */
.page-about .about-quote {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 23px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--warm);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(46px, 7vw, 90px) 0 clamp(56px, 8vw, 104px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 42, 71, .55), transparent 78%);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-family: var(--font-display);
  font-size: clamp(19px, 2.8vw, 28px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--ivory);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-top {
  display: inline-block;
  margin-top: clamp(24px, 3.4vw, 36px);
  font-size: 13px;
  letter-spacing: .1em;
  text-decoration: none;
  color: var(--mist);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .rhythm__row {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

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

  .page-about .faq-index__item {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto 1fr;
    align-content: start;
  }

  .page-about .faq-index__desc {
    grid-column: 1;
  }
}

@media (min-width: 900px) {
  .page-about .about-sec__grid {
    grid-template-columns: var(--about-aside) minmax(0, 1fr);
    gap: clamp(28px, 4.5vw, 64px);
  }

  .page-about .about-sec__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    position: sticky;
    top: 84px;
    align-self: start;
  }

  .page-about .about-band {
    /* 通栏保留 */
  }

  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 28px);
    margin-top: clamp(34px, 4vw, 48px);
    padding-top: 26px;
    border-top: 1px solid var(--line-strong);
  }

  .page-about .timeline__node {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .timeline__node::before {
    left: 0;
    top: -32px;
    width: 11px;
    height: 11px;
    box-shadow: 0 0 0 4px rgba(43, 224, 200, .14);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tab,
  .page-about .about-jump__inner a,
  .page-about .about-top {
    transition: none;
  }
}