.page-about {
  --about-cut: 18px;
  --about-mark: 118px;
  display: block;
}

.page-about .about-crumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(30px, 5vw, 58px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -18%;
  width: min(760px, 92vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(152deg, rgba(127, 212, 255, .22), rgba(43, 245, 208, .07) 44%, rgba(10, 22, 51, 0) 74%);
  clip-path: polygon(32% 0, 100% 0, 100% 72%, 0 100%);
  z-index: -1;
  pointer-events: none;
  opacity: .9;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  bottom: -8%;
  width: min(420px, 60vw);
  height: 2px;
  background: linear-gradient(90deg, rgba(43, 245, 208, .75), rgba(43, 245, 208, 0));
  transform: skewX(-32deg);
  z-index: -1;
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 58px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ice-white);
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 38em;
  color: var(--silver);
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 16px 17px;
  background: linear-gradient(140deg, rgba(24, 74, 122, .72), rgba(24, 74, 122, .30));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}

.page-about .about-stat:hover {
  background: linear-gradient(140deg, rgba(24, 74, 122, .95), rgba(24, 74, 122, .45));
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -.01em;
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--silver);
}

/* ---------- 索引栏 ---------- */
.page-about .about-index {
  position: static;
  margin-bottom: 6px;
}

.page-about .about-index .eyebrow {
  margin-bottom: 10px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: rgba(10, 22, 51, .6);
  color: var(--silver);
  font-size: 13.5px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% 62%, 82% 100%, 0 100%);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-index__link:hover {
  color: var(--ice-white);
  border-color: rgba(127, 212, 255, .55);
}

.page-about .about-index__link[data-active="true"] {
  color: var(--neon);
  border-color: var(--line-strong);
  background: rgba(43, 245, 208, .10);
}

.page-about .about-index__no {
  font-size: 11px;
  color: var(--ice);
  letter-spacing: .06em;
}

.page-about .about-index__link[data-active="true"] .about-index__no {
  color: var(--neon);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-flow {
  min-width: 0;
  padding-top: 10px;
}

.page-about .about-section {
  padding: clamp(30px, 5vw, 58px) 0;
}

.page-about .about-section:first-child {
  padding-top: 22px;
}

.page-about .about-rule {
  display: block;
  width: min(190px, 36%);
  height: 2px;
  margin-bottom: clamp(18px, 3vw, 28px);
  background: linear-gradient(90deg, var(--neon), rgba(43, 245, 208, 0) 88%);
  transform: skewX(-30deg);
  transform-origin: left center;
  opacity: .8;
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.1vw, 30px);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ice-white);
  max-width: 22ch;
}

.page-about .about-section__body {
  margin-top: 18px;
  max-width: 40em;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-section__body p + p {
  margin-top: 14px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 20px;
}

.page-about .about-origin .about-section__body {
  margin-top: 0;
}

.page-about .about-origin__fig {
  margin: 0;
}

.page-about .about-quote {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 19px 22px;
  background: linear-gradient(115deg, rgba(24, 74, 122, .92), rgba(24, 74, 122, .34));
  border-left: 3px solid var(--neon);
  color: var(--ice-white);
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.72;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

/* ---------- 内容维护 / 覆盖人群 图片带 ---------- */
.page-about .about-workflow__fig,
.page-about .about-band__fig {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), rgba(127, 212, 255, .22));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 2px solid var(--neon);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--neon);
  border-color: var(--mint);
}

.page-about .about-timeline__mark {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 5px;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--neon);
}

.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--ice);
  padding: 1px 7px 2px;
  border: 1px solid var(--line);
  background: rgba(24, 74, 122, .5);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 78% 100%, 0 100%);
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ice-white);
}

.page-about .about-timeline__text {
  margin-top: 6px;
  max-width: 38em;
  font-size: 14.8px;
  line-height: 1.82;
  color: var(--silver);
}

/* ---------- 团队条形 ---------- */
.page-about .about-bars {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-bars__item {
  padding: 16px 18px 18px;
  background: linear-gradient(140deg, rgba(24, 74, 122, .62), rgba(24, 74, 122, .24));
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}

.page-about .about-bars__item:hover {
  background: linear-gradient(140deg, rgba(24, 74, 122, .92), rgba(24, 74, 122, .40));
}

.page-about .about-bars__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-bars__name {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ice-white);
}

.page-about .about-bars__num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -.01em;
}

.page-about .about-bars__track {
  position: relative;
  height: 8px;
  margin-top: 11px;
  background: rgba(127, 212, 255, .14);
  overflow: hidden;
}

.page-about .about-bars__fill {
  display: block;
  height: 100%;
  width: var(--w, 50%);
  background: linear-gradient(90deg, var(--ice), var(--neon));
  transition: width var(--dur-slow) var(--ease);
}

.page-about .about-bars__note {
  margin-top: 11px;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 60px);
  padding: clamp(36px, 6vw, 68px) 0 clamp(42px, 6vw, 76px);
  background: linear-gradient(170deg, rgba(24, 74, 122, .34), rgba(5, 11, 24, .9));
  border-top: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -10%;
  top: -40%;
  width: min(520px, 70vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(255, 122, 47, .16), rgba(255, 122, 47, 0) 68%);
  clip-path: polygon(40% 0, 100% 0, 100% 100%, 0 82%);
  pointer-events: none;
}

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

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.9vw, 28px);
  line-height: 1.3;
  color: var(--ice-white);
}

.page-about .about-cta__lede {
  margin-top: 14px;
  max-width: 40em;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta__links .btn {
  flex: 0 1 auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-origin {
    grid-template-columns: 1.05fr .95fr;
    align-items: start;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-index {
    position: sticky;
    top: 110px;
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    clip-path: none;
    padding: 7px 10px;
    font-size: 14px;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--ice);
    background: rgba(127, 212, 255, .06);
  }

  .page-about .about-index__link[data-active="true"] {
    border-left-color: var(--neon);
    background: rgba(43, 245, 208, .08);
  }

  .page-about .about-flow {
    padding-top: 4px;
  }

  .page-about .about-timeline::before {
    left: var(--about-mark);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: var(--about-mark) minmax(0, 1fr);
    column-gap: 28px;
    padding: 0 0 30px 0;
  }

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

  .page-about .about-timeline__item::before {
    left: calc(var(--about-mark) - 7px);
    top: 6px;
  }

  .page-about .about-timeline__mark {
    justify-content: flex-end;
    padding-right: 2px;
    margin-bottom: 0;
    padding-top: 4px;
  }

  .page-about .about-timeline__body {
    padding-bottom: 2px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-quote {
    padding: 22px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-stat,
  .page-about .about-timeline__item::before,
  .page-about .about-bars__item,
  .page-about .about-bars__fill {
    transition: none;
  }
}

.page-about {
  --w: 1rem;
}