.page-about {
  --about-grid-line: rgba(198, 205, 211, .05);
  --about-cut: var(--l8-cut);
  display: block;
  color: var(--l8-silver);
  background: var(--l8-ink);
  font-family: var(--l8-font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 40px 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 20px;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  pointer-events: none;
}

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

.page-about .about-hero__label {
  margin: 22px 0 0;
  color: var(--l8-cyan);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  max-width: 17em;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--l8-paper);
  font-weight: 800;
}

.page-about .about-hero__lead {
  max-width: 46em;
  margin: 18px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--l8-silver);
}

.page-about .about-hero__trace {
  position: absolute;
  right: 20px;
  bottom: 96px;
  width: 380px;
  height: auto;
  opacity: .85;
  pointer-events: none;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--l8-line);
  border-top: 1px solid var(--l8-line-strong);
  border-bottom: 1px solid var(--l8-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--l8-ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-stat__num {
  font-family: var(--l8-font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--l8-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__num--amber {
  color: var(--l8-amber);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--l8-rock);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--l8-gap);
  align-items: start;
  padding-bottom: 64px;
}

.page-about .about-rail {
  position: static;
  order: -1;
  padding: 16px 18px;
  background: var(--l8-graphite);
  border: 1px solid var(--l8-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--l8-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--l8-rock);
}

.page-about .about-rail__nav {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__nav .l8-rail__list {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
}

.page-about .about-rail__nav .l8-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  white-space: nowrap;
  font-size: 13px;
  color: var(--l8-silver);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--l8-ease), border-color .2s var(--l8-ease);
}

.page-about .about-rail__nav .l8-rail__link:hover,
.page-about .about-rail__nav .l8-rail__link.is-active {
  color: var(--l8-cyan);
  border-bottom-color: var(--l8-cyan);
}

.page-about .about-rail__idx {
  font-family: var(--l8-font-mono);
  font-size: 11px;
  color: var(--l8-rock);
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: 34px;
  border-top: 1px solid var(--l8-line);
  scroll-margin-top: 132px;
}

.page-about .about-section--last {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num title"
    "desc desc";
  column-gap: 14px;
  row-gap: 12px;
  margin-bottom: 24px;
}

.page-about .about-head__num {
  grid-area: num;
  font-family: var(--l8-font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--l8-cinnabar);
  letter-spacing: -.02em;
}

.page-about .about-head__title {
  grid-area: title;
  align-self: center;
  margin: 0;
  font-size: clamp(21px, 3.4vw, 26px);
  line-height: 1.4;
  color: var(--l8-paper);
  font-weight: 800;
}

.page-about .about-head__desc {
  grid-area: desc;
  margin: 0;
  max-width: 54em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--l8-silver);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-team__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--l8-line);
  border: 1px solid var(--l8-line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--l8-graphite);
}

.page-about .about-fact__num {
  font-family: var(--l8-font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--l8-paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__num--amber {
  color: var(--l8-amber);
  font-size: 28px;
}

.page-about .about-fact__unit {
  font-size: 14px;
  margin-left: 2px;
  color: var(--l8-rock);
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--l8-rock);
}

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

/* ---------- 数据流程 ---------- */
.page-about .about-flow__media {
  margin: 0 0 22px;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--l8-line);
  border: 1px solid var(--l8-line);
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--l8-graphite);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-flow__step::after {
  content: "";
  position: absolute;
  left: 18px;
  bottom: 0;
  width: 46px;
  height: 2px;
  background: var(--l8-cyan);
  opacity: .5;
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--l8-font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--l8-cyan);
}

.page-about .about-flow__title {
  margin: 10px 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--l8-paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--l8-rock);
}

.page-about .about-flow__note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--l8-amber);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--l8-silver);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__media {
  margin: 0 0 22px;
}

.page-about .about-timeline .l8-tabs__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline .l8-tabs__btn {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 96px;
  padding: 12px 16px;
  text-align: left;
  background: var(--l8-graphite);
  border: 1px solid var(--l8-line);
  color: var(--l8-silver);
  font-family: var(--l8-font-sans);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color .2s var(--l8-ease), color .2s var(--l8-ease);
}

.page-about .about-timeline .l8-tabs__btn[aria-selected="true"] {
  border-color: var(--l8-cyan);
  color: var(--l8-paper);
  box-shadow: inset 3px 0 0 var(--l8-cyan);
}

.page-about .about-timeline__ver {
  font-family: var(--l8-font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--l8-cyan);
}

.page-about .about-timeline__name {
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--l8-rock);
}

/* ---------- 通用面板 ---------- */
.page-about .about-panel {
  margin-top: 18px;
  padding: 22px 20px 24px;
  background: var(--l8-graphite);
  border: 1px solid var(--l8-line);
  border-left: 3px solid var(--l8-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-size: 18px;
  line-height: 1.5;
  color: var(--l8-paper);
}

.page-about .about-panel__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--l8-silver);
}

.page-about .about-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 12px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--l8-silver);
}

.page-about .about-list li:last-child {
  margin-bottom: 0;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 2px;
  background: var(--l8-amber);
}

/* ---------- 评价维度 ---------- */
.page-about .about-reviews .l8-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.page-about .about-reviews .l8-tabs__btn {
  padding: 10px 18px;
  font-family: var(--l8-font-sans);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--l8-silver);
  background: var(--l8-graphite-2);
  border: 1px solid var(--l8-line);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: color .2s var(--l8-ease), border-color .2s var(--l8-ease);
}

.page-about .about-reviews .l8-tabs__btn[aria-selected="true"] {
  color: var(--l8-ink);
  background: var(--l8-clay);
  border-color: var(--l8-clay);
}

.page-about .about-panel--review {
  border-left-color: var(--l8-clay);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  margin: 0;
}

.page-about .about-partner {
  padding: 20px;
  background: var(--l8-graphite);
  border: 1px solid var(--l8-line);
  border-top: 2px solid var(--l8-moss);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-partner__title {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--l8-paper);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--l8-rock);
}

.page-about .about-partners__link {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--l8-silver);
}

.page-about .about-partners__link a {
  color: var(--l8-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 208, .4);
}

.page-about .about-partners__link a:hover {
  border-bottom-color: var(--l8-cyan);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promises {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--l8-line);
  border: 1px solid var(--l8-line);
}

.page-about .about-promise {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  background: var(--l8-graphite);
}

.page-about .about-promise__mark {
  font-family: var(--l8-font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--l8-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-promise__unit {
  font-size: 13px;
  margin-left: 2px;
  color: var(--l8-rock);
}

.page-about .about-promise__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--l8-silver);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin: 0;
}

.page-about .about-next__card {
  display: block;
  padding: 20px;
  background: var(--l8-graphite-2);
  border: 1px solid var(--l8-line);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--l8-cut-lg)), calc(100% - var(--l8-cut-lg)) 100%, 0 100%);
  transition: border-color .2s var(--l8-ease), background .2s var(--l8-ease);
}

.page-about .about-next__card:hover {
  border-color: var(--l8-cyan);
  background: var(--l8-graphite);
}

.page-about .about-next__title {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--l8-paper);
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--l8-rock);
}

.page-about .about-contact {
  margin-top: 22px;
  padding: 20px;
  background: var(--l8-graphite);
  border: 1px solid var(--l8-line);
  border-left: 3px solid var(--l8-cinnabar);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--l8-line);
}

.page-about .about-contact__row:first-child {
  padding-top: 0;
}

.page-about .about-contact__key {
  flex: 0 0 76px;
  font-family: var(--l8-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--l8-rock);
}

.page-about .about-contact__val {
  font-family: var(--l8-font-mono);
  font-size: 14.5px;
  color: var(--l8-paper);
  overflow-wrap: anywhere;
}

.page-about .about-contact__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--l8-rock);
}

/* ---------- 中等屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-block: 52px 64px;
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-promises {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-head__num {
    font-size: 38px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1025px) {
  .page-about .about-hero__trace {
    bottom: 120px;
    width: 460px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 44px;
    padding-bottom: 88px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 128px;
    order: 0;
    padding: 20px;
  }

  .page-about .about-rail__nav {
    overflow-x: visible;
  }

  .page-about .about-rail__nav .l8-rail__list {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-about .about-rail__nav .l8-rail__link {
    width: 100%;
    padding: 9px 0 9px 10px;
    border-bottom: none;
    border-left: 2px solid transparent;
    font-size: 14px;
  }

  .page-about .about-rail__nav .l8-rail__link:hover,
  .page-about .about-rail__nav .l8-rail__link.is-active {
    border-left-color: var(--l8-cyan);
    border-bottom-color: transparent;
    background: rgba(53, 214, 208, .06);
  }

  .page-about .about-section {
    padding-block: 46px;
  }

  .page-about .about-head {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas:
      "num title"
      "num desc";
    column-gap: 20px;
    margin-bottom: 30px;
  }

  .page-about .about-head__num {
    font-size: 44px;
    padding-top: 2px;
  }

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

  .page-about .about-promises {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}