.page-about {
  --about-cut: 14px;
  --about-gap: clamp(18px, 3vw, 32px);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(18px, 3vw, 34px) clamp(36px, 6vw, 76px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -140px;
  left: 0;
  width: min(680px, 92%);
  height: 360px;
  background: radial-gradient(closest-side, var(--neon-soft), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  margin-top: clamp(20px, 3.4vw, 40px);
}

.page-about .about-hero__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  color: var(--muted);
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.75;
  max-width: 46ch;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: center;
  padding: 6px 13px;
  border: 1px solid var(--neon-line);
  border-radius: var(--r-pill);
  background: var(--neon-soft);
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, var(--space-800), var(--space-900));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  opacity: 0.92;
}

/* ---------- 团队 ---------- */
.page-about .about-team__lede {
  margin-top: 16px;
}

.page-about .about-team__split {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 42px);
  align-items: center;
}

.page-about .about-team__chart {
  text-align: center;
}

.page-about .about-team__wheel {
  position: relative;
  width: min(290px, 72vw);
  aspect-ratio: 1;
  margin-inline: auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(from -90deg,
    var(--neon) 0deg 140.9deg,
    var(--cyan) 140.9deg 234.8deg,
    var(--orange) 234.8deg 305.2deg,
    var(--amber) 305.2deg 360deg);
  box-shadow: 0 0 48px rgba(53, 245, 160, 0.14);
}

.page-about .about-team__wheel-core {
  display: grid;
  place-items: center;
  width: 56%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--space-900);
  border: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: clamp(30px, 4.4vw, 44px);
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-team__wheel-core i {
  font-style: normal;
  font-size: 0.36em;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .about-team__chart-note {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left-width: 3px;
  border-radius: var(--r-sm);
  background: linear-gradient(140deg, var(--space-800), rgba(8, 21, 50, 0.42));
  transition: border-color 0.3s var(--ease-brand), box-shadow 0.3s var(--ease-brand);
}

.page-about .about-team__item--a { border-left-color: var(--neon); }
.page-about .about-team__item--b { border-left-color: var(--cyan); }
.page-about .about-team__item--c { border-left-color: var(--orange); }
.page-about .about-team__item--d { border-left-color: var(--amber); }

.page-about .about-team__item:hover {
  border-color: var(--line);
  box-shadow: inset 0 0 0 1px var(--line-soft);
}

.page-about .about-team__num {
  font-family: var(--font-data);
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1;
  color: var(--text);
  min-width: 2ch;
}

.page-about .about-team__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.01em;
}

.page-about .about-team__item p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-team__more {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-team__more a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon-line);
}

.page-about .about-team__more a:hover {
  color: var(--text);
}

/* ---------- 时间线分屏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
  margin-top: clamp(22px, 3.5vw, 38px);
}

.page-about .about-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s var(--ease-brand), border-color 0.25s var(--ease-brand);
}

.page-about .about-rail__link .bs-num {
  font-family: var(--font-data);
  color: var(--cyan);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text);
  border-color: var(--neon-line);
}

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

.page-about .about-file {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, var(--space-800), rgba(4, 10, 28, 0.55));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color 0.3s var(--ease-brand);
}

.page-about .about-file[open] {
  border-color: var(--neon-line);
}

.page-about .about-file summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
}

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

.page-about .about-file__title {
  margin: 0;
  flex: 1 1 auto;
  min-width: 11ch;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 19px);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-file__year {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-file summary::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-file[open] summary::after {
  content: "−";
  color: var(--muted);
}

.page-about .about-file__body {
  padding: 0 20px 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-file__body p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.76;
  max-width: 62ch;
}

/* ---------- 数据流程 ---------- */
.page-about .about-data {
  padding-bottom: 0;
}

.page-about .about-data__split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-data__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--space-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-data__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .about-data__steps {
  list-style: none;
  counter-reset: aq-step;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-data__step {
  counter-increment: aq-step;
  position: relative;
  padding-left: 46px;
}

.page-about .about-data__step::before {
  content: "0" counter(aq-step);
  position: absolute;
  left: 0;
  top: 1px;
  padding: 2px 6px;
  border: 1px solid var(--cyan-line);
  border-radius: var(--r-sm);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-data__step h3 {
  margin: 0 0 4px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-data__step p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 横向数据带 ---------- */
.page-about .about-band {
  position: relative;
  margin-top: clamp(36px, 6vw, 72px);
  padding-block: clamp(28px, 4vw, 42px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, var(--neon-soft), transparent 42%, transparent 58%, var(--orange-soft)),
    var(--space-900);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--neon-line) 0 2px, transparent 2px 12px);
  opacity: 0.7;
}

.page-about .about-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-band__cell {
  border-left: 2px solid var(--line);
  padding-left: 16px;
}

.page-about .about-band__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-band__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 版本年轮 ---------- */
.page-about .about-versions__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3.5vw, 36px);
}

.page-about .about-ver {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--space-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color 0.3s var(--ease-brand);
}

.page-about .about-ver[open] {
  border-color: var(--orange-line);
}

.page-about .about-ver summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
}

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

.page-about .about-ver__no {
  font-family: var(--font-data);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-ver summary h3 {
  margin: 0;
  flex: 1 1 auto;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .about-ver summary::after {
  content: "▾";
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-ver[open] summary::after {
  content: "▴";
  color: var(--neon);
}

.page-about .about-ver__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-ver__body p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.72;
}

/* ---------- 改版标准 ---------- */
.page-about .about-standard__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-standard__card {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--neon);
  border-radius: 0 0 var(--r-md) var(--r-md);
  background: linear-gradient(180deg, rgba(13, 31, 66, 0.92), rgba(8, 21, 50, 0.6));
}

.page-about .about-standard__card:nth-child(2) { border-top-color: var(--cyan); }
.page-about .about-standard__card:nth-child(3) { border-top-color: var(--orange); }

.page-about .about-standard__idx {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 10px;
}

.page-about .about-standard__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
}

.page-about .about-standard__card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 使用场景 ---------- */
.page-about .about-reach__split {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
}

.page-about .about-reach__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--space-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-reach__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: 0.86;
}

.page-about .about-reach__stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .about-reach__stat {
  border-left: 2px solid var(--cyan-line);
  padding-left: 12px;
}

.page-about .about-reach__stat .bs-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(20px, 2.4vw, 28px);
  color: var(--text);
  line-height: 1.15;
}

.page-about .about-reach__stat span:last-child {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-reach__note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 去向卡片 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--space-800);
  color: var(--text);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color 0.3s var(--ease-brand), background-color 0.3s var(--ease-brand);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--neon-line);
  background: var(--space-700);
}

.page-about .about-next__card .bs-tag {
  align-self: flex-start;
}

.page-about .about-next__card h3 {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
}

.page-about .about-next__card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-next__go {
  margin-top: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--neon);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 700px) {
  .page-about .about-versions__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-standard__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-band__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-team__split {
    grid-template-columns: minmax(240px, 4fr) minmax(0, 8fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(170px, 3fr) minmax(0, 9fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 120px;
  }

  .page-about .about-rail__link {
    border: 0;
    border-radius: 0;
    padding: 14px 0 14px 26px;
    position: relative;
    white-space: normal;
    font-size: 15px;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 15px;
    height: 1px;
    background: var(--line);
  }

  .page-about .about-rail__link::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--line-soft) 16%, var(--line-soft) 84%, transparent);
  }

  .page-about .about-data__split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .about-reach__split {
    grid-template-columns: minmax(230px, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 1100px) {
  .page-about .about-versions__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}