.page-about {
  --about-rail: 56px;
  --about-gap: 16px;
  --about-line: rgba(62, 232, 214, 0.26);
  --about-shadow: 0 1px 0 rgba(53, 69, 110, 0.7), 0 26px 48px -32px rgba(0, 0, 0, 0.95);
  position: relative;
  overflow-x: hidden;
  color: var(--frost);
  background:
    radial-gradient(900px 520px at 84% -8%, rgba(62, 232, 214, 0.1), transparent 62%),
    linear-gradient(168deg, #050A18 0%, #071026 42%, #1A1136 100%);
}

/* ---------- 首屏档案封面 ---------- */

.page-about .about-hero {
  padding: 22px 0 10px;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 7.4vw, 52px);
  line-height: 1.14;
  margin: 10px 0 16px;
}

.page-about .about-hero .lede {
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(238, 243, 255, 0.86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.page-about .fact {
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius);
  padding: 12px 14px;
  background: linear-gradient(160deg, rgba(11, 22, 48, 0.95), rgba(26, 17, 54, 0.72));
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-hero__aside {
  padding: 20px 18px 22px;
}

.page-about .hero-index {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .hero-index a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--frost);
  text-decoration: none;
  font-size: 15px;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.page-about .hero-index a:hover,
.page-about .hero-index a:focus-visible {
  background: rgba(62, 232, 214, 0.08);
  border-color: rgba(62, 232, 214, 0.4);
  color: var(--neon);
}

.page-about .hero-index .mono {
  flex: none;
  font-size: 12px;
  color: var(--neon);
}

.page-about .hero-index__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .hero-index__note a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(246, 184, 74, 0.5);
}

.page-about .hero-index__note a:hover {
  color: var(--frost);
}

/* ---------- 吸顶章节导航 ---------- */

.page-about .chapter-nav {
  position: sticky;
  top: var(--topbar-h);
  z-index: 6;
  margin: 20px 0 26px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(5, 10, 24, 0.92);
  backdrop-filter: blur(8px);
}

.page-about .chapter-nav__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.page-about .chapter-nav__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

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

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

.page-about .chapter-nav__link {
  display: inline-block;
  white-space: nowrap;
  padding: 5px 12px;
  font-size: 13px;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .chapter-nav__link:hover,
.page-about .chapter-nav__link:focus-visible {
  color: var(--neon);
  border-color: rgba(62, 232, 214, 0.5);
}

.page-about .chapter-nav__link.is-active {
  color: var(--abyss);
  background: var(--neon);
  border-color: var(--neon);
}

/* ---------- 垂直时间轴 ---------- */

.page-about .timeline {
  position: relative;
  padding-bottom: 34px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: calc(var(--about-rail) / 2);
  width: 1px;
  transform: translateX(-0.5px);
  background: linear-gradient(
    180deg,
    rgba(62, 232, 214, 0.06),
    rgba(62, 232, 214, 0.42) 14%,
    rgba(43, 30, 85, 0.9) 55%,
    rgba(246, 184, 74, 0.45) 88%,
    rgba(246, 184, 74, 0.06)
  );
}

.page-about .stage {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: var(--about-gap);
  padding-bottom: 30px;
}

.page-about .stage:last-child {
  padding-bottom: 0;
}

.page-about .stage__rail {
  position: sticky;
  top: calc(var(--topbar-h) + 74px);
  align-self: start;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 8px;
}

.page-about .stage__num {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--neon);
  background: #050A18;
  border: 1px solid rgba(62, 232, 214, 0.45);
  border-radius: 999px;
  padding: 5px 9px;
}

.page-about .stage__year {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.35;
  letter-spacing: 0.04em;
  text-align: center;
  color: var(--steel);
}

.page-about .stage__body {
  padding: 22px 18px 24px;
  box-shadow: var(--about-shadow);
  background-image: linear-gradient(150deg, rgba(11, 22, 48, 0.98), rgba(11, 22, 48, 0.84));
}

.page-about .stage__body p {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(238, 243, 255, 0.88);
  margin: 0 0 14px;
}

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

.page-about .stage__body .section-title {
  margin-bottom: 14px;
}

.page-about .stage__lede {
  color: var(--steel) !important;
}

.page-about .stage__note {
  margin-top: 16px !important;
  padding: 12px 14px;
  border-left: 3px solid var(--amber);
  background: rgba(26, 17, 54, 0.72);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px !important;
  color: rgba(238, 243, 255, 0.88) !important;
}

.page-about .stage__note a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 232, 214, 0.45);
}

.page-about .stage__body a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 232, 214, 0.35);
}

.page-about .stage__body a:hover {
  color: var(--frost);
}

/* 起点清单 */

.page-about .mini-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .mini-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(238, 243, 255, 0.82);
  padding: 10px 12px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.page-about .mini-list .mono {
  flex: none;
  padding-top: 3px;
  font-size: 12px;
  color: var(--neon);
}

/* 改版三步 */

.page-about .step-title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--amber);
}

.page-about .step-list .step-list__body p {
  margin: 0;
  font-size: 15px;
}

/* 三条主线 */

.page-about .grid--3 {
  gap: 14px;
}

.page-about .grid--2 {
  gap: 22px;
}

.page-about .pillar {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(26, 17, 54, 0.92), rgba(11, 22, 48, 0.92));
}

.page-about .pillar::after {
  content: "";
  position: absolute;
  right: 6px;
  bottom: 6px;
  width: 14px;
  height: 14px;
  border-right: 1px solid rgba(53, 69, 110, 0.95);
  border-bottom: 1px solid rgba(53, 69, 110, 0.95);
}

.page-about .pillar__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
  margin: 12px 0 8px;
}

.page-about .pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(238, 243, 255, 0.84);
}

/* 团队分工 */

.page-about .role {
  padding: 4px 0 4px 14px;
  border-left: 2px solid rgba(62, 232, 214, 0.5);
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .role__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
  margin: 6px 0 8px;
}

.page-about .role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(238, 243, 255, 0.84);
}

/* 版本说明规范 */

.page-about .field-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

/* 本地服务 */

.page-about .stage__body--local {
  position: relative;
  overflow: hidden;
  min-height: 280px;
}

.page-about .local-visual {
  position: absolute;
  right: -14%;
  bottom: -18%;
  width: 92%;
  max-width: 620px;
  opacity: 0.22;
  pointer-events: none;
}

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

.page-about .local-copy {
  position: relative;
  z-index: 1;
  max-width: 62ch;
}

.page-about .local-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .local-list li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(5, 10, 24, 0.55);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(238, 243, 255, 0.9);
}

.page-about .local-list__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* ---------- 里程碑带 ---------- */

.page-about .mile {
  margin-top: 30px;
  padding: 34px 0 40px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(26, 17, 54, 0.6), rgba(5, 10, 24, 0));
}

.page-about .section-lede {
  margin: 12px 0 0;
  max-width: 52em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .mile-strip {
  margin-top: 22px;
  overflow-x: auto;
  padding-bottom: 16px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .mile-track {
  display: flex;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 4px 6vw 6px;
  min-width: max-content;
}

.page-about .mile-item {
  position: relative;
  flex: none;
  width: 232px;
  scroll-snap-align: start;
  padding: 16px 16px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(11, 22, 48, 0.96), rgba(26, 17, 54, 0.82));
  box-shadow: 0 18px 34px -30px rgba(0, 0, 0, 0.95);
}

.page-about .mile-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--amber);
}

.page-about .mile-item:nth-child(odd)::before {
  background: var(--neon);
}

.page-about .mile__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .mile__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--frost);
  margin: 8px 0 6px;
}

.page-about .mile__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 结尾承接 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--line);
  padding: 42px 0 50px;
  background:
    radial-gradient(620px 260px at 78% 130%, rgba(62, 232, 214, 0.14), transparent 70%),
    linear-gradient(200deg, rgba(26, 17, 54, 0.9), rgba(5, 10, 24, 0.98));
}

.page-about .about-next__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-next p {
  margin: 14px 0 0;
  max-width: 48em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(238, 243, 255, 0.86);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 交互与动效 ---------- */

.page-about .stage[data-reveal] {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about .mile-item:hover {
  background: linear-gradient(160deg, rgba(43, 30, 85, 0.95), rgba(26, 17, 54, 0.9));
  transition: background 0.12s linear;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about {
    --about-rail: 82px;
    --about-gap: 26px;
  }

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

  .page-about .stage__body {
    padding: 26px 26px 28px;
  }

  .page-about .local-visual {
    right: -6%;
    bottom: -22%;
    width: 62%;
    opacity: 0.28;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-rail: 96px;
    --about-gap: 34px;
  }

  .page-about .about-hero {
    padding: 34px 0 14px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 1fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .timeline {
    padding-bottom: 46px;
  }

  .page-about .stage {
    padding-bottom: 40px;
  }

  .page-about .stage:nth-child(even) .stage__body {
    margin-left: 5%;
  }

  .page-about .mile-item {
    width: 252px;
  }
}
</｜｜DSML｜｜ parameter>
</invoke>
</｜｜DSML｜｜ parameter>