.page-about {
  display: block;
  padding-bottom: clamp(48px, 7vw, 84px);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(16px, 2.6vw, 30px);
  margin-bottom: clamp(14px, 2.4vw, 26px);
}
.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .crumbs__item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .crumbs__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 60px) 0 clamp(28px, 5vw, 56px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 95% at 100% 0%, rgba(124, 92, 255, 0.22), transparent 58%),
    radial-gradient(85% 85% at 0% 14%, rgba(53, 230, 255, 0.13), transparent 62%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: -10% -5%;
  background-image: repeating-linear-gradient(
    98deg,
    rgba(53, 230, 255, 0.05) 0 1px,
    transparent 1px 86px
  );
  pointer-events: none;
}
.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 44px);
}
.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}
.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--text);
  max-width: 22ch;
}
.page-about .about-hero__intro {
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-fact {
  background: rgba(11, 17, 34, 0.82);
  padding: clamp(14px, 2vw, 20px);
}
.page-about .about-fact__num {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}
.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(38px, 6.5vw, 78px) 0;
  border-top: 1px solid var(--line);
}
.page-about .about-sec__wrap {
  position: relative;
}
.page-about .about-sec__rail {
  display: none;
}
.page-about .sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3.6vw, 42px);
  max-width: 70ch;
}
.page-about .sec-head__idx {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--neon);
}
.page-about .sec-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.22;
  color: var(--text);
}
.page-about .sec-head__note {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  position: relative;
  display: block;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--frame);
  overflow: hidden;
}
.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .media__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}
.page-about .about-tl-media {
  margin-bottom: clamp(26px, 4vw, 46px);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .about-yearnav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 0;
  padding: 0 0 16px;
  list-style: none;
  border-bottom: 1px solid var(--line);
}
.page-about .about-yearnav__link {
  display: block;
  padding: 3px 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-yearnav__link:hover,
.page-about .about-yearnav__link:focus-visible,
.page-about .about-yearnav__link[aria-current="true"] {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon), var(--violet) 55%, rgba(38, 48, 77, 0.2));
}
.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 40px) 30px;
}
.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 3px rgba(53, 230, 255, 0.12);
}
.page-about .about-tl__item--major::before {
  width: 15px;
  height: 15px;
  left: -2px;
  top: 5px;
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 122, 51, 0.16);
}
.page-about .about-tl__year {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--neon);
}
.page-about .about-tl__item--major .about-tl__year {
  color: var(--amber);
}
.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.36;
  color: var(--text);
}
.page-about .about-tl__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 六类内容 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 44px);
  align-items: start;
}
.page-about .about-cats {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-cat {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-cat:first-child {
  border-top: 1px solid var(--line);
}
.page-about .about-cat__idx {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--violet);
}
.page-about .about-cat__title {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.35;
  color: var(--text);
}
.page-about .about-cat__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-cat__body .tag {
  display: inline-block;
  margin-top: 10px;
}

/* ---------- 数据来源（编辑部排版） ---------- */
.page-about .about-editorial {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}
.page-about .about-editorial__main p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 62ch;
}
.page-about .about-editorial__main p:last-child {
  margin-bottom: 0;
}
.page-about .about-lead {
  color: var(--text) !important;
  font-size: 17px !important;
}
.page-about .about-lead::first-letter {
  float: left;
  margin: 4px 10px 0 0;
  font-family: var(--font-display);
  font-size: 3.1em;
  line-height: 0.84;
  color: var(--neon);
}
.page-about .about-paper {
  margin: 0 0 18px;
  background: var(--paper);
  color: #0d1526;
  border: 1px solid #c6d0e4;
  padding: clamp(20px, 3vw, 30px);
}
.page-about .about-paper p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.3vw, 22px);
  line-height: 1.55;
  color: #0d1526;
  font-weight: 500;
}
.page-about .about-editorial__side {
  display: grid;
  gap: 18px;
  align-content: start;
}
.page-about .about-note {
  padding: 16px 18px;
  background: rgba(19, 28, 51, 0.62);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  outline: none;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.page-about .about-note:hover,
.page-about .about-note:focus-within,
.page-about .about-note:focus-visible {
  border-color: var(--neon);
  background: rgba(19, 28, 51, 0.9);
}
.page-about .about-note .note__label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--neon);
}
.page-about .about-note__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.page-about .about-note:hover .about-note__text,
.page-about .about-note:focus-within .about-note__text {
  display: block;
  -webkit-line-clamp: unset;
  overflow: visible;
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0 0 clamp(24px, 3.6vw, 40px);
  padding: 0;
  list-style: none;
}
.page-about .about-team {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--neon);
  background: rgba(19, 28, 51, 0.45);
}
.page-about .about-team:nth-child(2) {
  border-top-color: var(--violet);
}
.page-about .about-team:nth-child(3) {
  border-top-color: var(--amber);
}
.page-about .about-team:nth-child(4) {
  border-top-color: var(--ok);
}
.page-about .about-team__badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  border: 1px solid var(--line);
}
.page-about .about-team__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--text);
}
.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-rhythm {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  background:
    linear-gradient(98deg, rgba(53, 230, 255, 0.06) 0 1px, transparent 1px 72px),
    var(--frame);
}
.page-about .about-rhythm__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--neon);
}
.page-about .about-rhythm__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .about-rhythm__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
}
.page-about .about-rhythm__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-rhythm__list .mono {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--text);
}

/* ---------- 合作生态 ---------- */
.page-about .about-collab-media {
  margin-bottom: clamp(24px, 3.6vw, 42px);
}
.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
}
.page-about .about-col {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.page-about .about-col__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
}
.page-about .about-col__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 里程碑 ---------- */
.page-about .about-miles {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-mile {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-mile:first-child {
  border-top: 1px solid var(--line);
}
.page-about .about-mile__num {
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}
.page-about .about-mile__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--text);
}
.page-about .about-mile__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 末尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 62px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(100% 140% at 0% 0%, rgba(255, 122, 51, 0.12), transparent 62%),
    rgba(11, 17, 34, 0.6);
}
.page-about .about-cta__inner {
  padding: clamp(28px, 4.4vw, 52px) 0;
  display: grid;
  gap: 20px;
}
.page-about .about-cta__text {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.8vw, 28px);
  line-height: 1.42;
  color: var(--text);
  max-width: 34ch;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-rhythm__list li {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-mile {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 10px 28px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 0.9fr);
    align-items: end;
  }
  .page-about .about-tl-layout {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 44px;
  }
  .page-about .about-yearnav {
    position: sticky;
    top: calc(var(--calbar-h) + 22px);
    display: block;
    padding: 0 0 0 0;
    border-bottom: 0;
    align-self: start;
  }
  .page-about .about-yearnav__link {
    padding: 4px 0 4px 12px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }
  .page-about .about-yearnav__link:hover,
  .page-about .about-yearnav__link:focus-visible,
  .page-about .about-yearnav__link[aria-current="true"] {
    border-bottom-color: transparent;
    border-left-color: var(--neon);
  }
  .page-about .about-editorial {
    grid-template-columns: minmax(0, 1fr) 296px;
    gap: 52px;
  }
  .page-about .about-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  }
  .page-about .about-split__media {
    position: sticky;
    top: calc(var(--calbar-h) + 26px);
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-teams {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .about-sec__rail {
    display: block;
    position: absolute;
    left: -46px;
    top: 6px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: rgba(163, 174, 203, 0.42);
    pointer-events: none;
  }
  .page-about .about-hero__title {
    transform: scaleX(1.02);
    transform-origin: left center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}