.page-about {
  --about-hair: rgba(185, 191, 201, 0.2);
  --about-hair-strong: rgba(185, 191, 201, 0.46);
  --about-panel: rgba(38, 53, 95, 0.4);
  --about-lift: rgba(38, 53, 95, 0.62);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding-bottom: 72px;
  overflow-wrap: break-word;
}

.page-about p {
  margin: 0 0 14px;
  color: var(--silver);
}

.page-about a {
  color: var(--lime);
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--silver);
  padding: 26px 0 30px;
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  padding-bottom: 36px;
  border-bottom: 3px solid var(--about-hair-strong);
}

.page-about .about-hero__lead .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.022em;
  color: var(--white);
  margin: 0 0 18px;
}

.page-about .about-hero__lead .lede {
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--silver);
  max-width: 46em;
  margin: 0;
}

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

.page-about .about-hero__facts li {
  background: var(--ink);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.01em;
}

.page-about .about-fact__label {
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--silver);
}

/* ---------- 主体分栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-top: 40px;
}

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

.page-about .about-rail__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 14px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__node {
  flex: 0 0 auto;
  min-width: 132px;
  padding-left: 14px;
  border-left: 2px solid var(--about-hair-strong);
  transition: border-color 0.18s ease;
}

.page-about .about-rail__node:hover {
  border-left-color: var(--lime);
}

.page-about .about-rail__season {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-rail__note {
  display: block;
  font-size: 12px;
  color: var(--silver);
  margin-top: 2px;
}

.page-about .about-rail__node:hover .about-rail__note {
  color: var(--lime);
}

/* ---------- 章节通用 ---------- */

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 58px;
  min-width: 0;
}

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

.page-about .about-sec__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--white);
  margin: 0 0 16px;
  padding-left: 16px;
  border-left: 4px solid var(--lime);
}

.page-about .about-sec__lead {
  font-size: 17px;
  line-height: 1.74;
  color: var(--white);
  font-weight: 500;
}

/* ---------- 流程步骤 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 3px solid var(--about-hair-strong);
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 2px;
  border-bottom: 1px solid var(--about-hair);
  transition: background-color 0.16s ease;
}

.page-about .about-steps li:hover {
  background: var(--about-panel);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--lime);
}

.page-about .about-steps__body strong {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 3px;
}

.page-about .about-steps__body span {
  font-size: 14.5px;
  color: var(--silver);
}

/* ---------- 图片框 ---------- */

.page-about .figure-frame {
  margin: 24px 0 0;
}

.page-about .figure-frame__media {
  overflow: hidden;
  border: 2px solid var(--about-hair-strong);
  background: var(--carbon);
}

.page-about .figure-frame__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure--wide .figure-frame__media {
  aspect-ratio: 7 / 3;
}

.page-about .about-figure--hall .figure-frame__media {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--desk .figure-frame__media {
  aspect-ratio: 14 / 9;
}

.page-about .figure-frame__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--silver);
}

/* ---------- 五类档案 ---------- */

.page-about .about-files {
  margin-top: 26px;
  border-top: 3px solid var(--about-hair-strong);
}

.page-about .about-file {
  display: grid;
  gap: 8px;
  padding: 18px 2px;
  border-bottom: 1px solid var(--about-hair);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-file:hover {
  background: var(--about-panel);
  border-bottom-color: var(--lime);
}

.page-about .about-file__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-file__name {
  font-family: var(--font-display);
  font-size: 18.5px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0;
}

.page-about .about-file__head .tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.page-about .about-file__desc {
  margin: 0;
  font-size: 15px;
  color: var(--silver);
}

.page-about .about-file__use {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--orange);
}

/* ---------- 数据带 ---------- */

.page-about .about-metrics {
  list-style: none;
  margin: 28px 0 0;
  padding: 18px 16px 20px;
  background: var(--carbon);
  border: 2px solid var(--about-hair-strong);
  display: grid;
  gap: 14px;
}

.page-about .about-metric {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name val"
    "track track";
  gap: 6px 12px;
  align-items: center;
}

.page-about .about-metric__name {
  grid-area: name;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .about-metric__val {
  grid-area: val;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--white);
  text-align: right;
}

.page-about .about-metric__track {
  grid-area: track;
  display: block;
  height: 9px;
  background: var(--indigo-mid);
  overflow: hidden;
}

.page-about .about-metric__fill {
  display: block;
  height: 100%;
  width: 24%;
  background: var(--lime);
}

.page-about .about-metric:nth-child(1) .about-metric__fill {
  width: 100%;
  background: var(--lime);
}

.page-about .about-metric:nth-child(2) .about-metric__fill {
  width: 68%;
  background: var(--orange);
}

.page-about .about-metric:nth-child(3) .about-metric__fill {
  width: 52%;
  background: var(--silver);
}

.page-about .about-metric:nth-child(4) .about-metric__fill {
  width: 40%;
  background: var(--lime-deep);
}

.page-about .about-metric:nth-child(5) .about-metric__fill {
  width: 30%;
  background: var(--orange);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .about-team__grid .figure-frame {
  margin: 0;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 3px solid var(--about-hair-strong);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-role__body strong {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 3px;
}

.page-about .about-role__body span {
  font-size: 14.5px;
  color: var(--silver);
}

/* ---------- 旁注块 ---------- */

.page-about .about-aside {
  margin-top: 28px;
  padding: 18px 20px 20px;
  background: var(--about-lift);
  border-left: 4px solid var(--orange);
}

.page-about .about-aside__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 12px;
}

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

.page-about .about-aside__list a {
  display: inline-block;
  font-size: 15px;
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--edge-strong);
  padding-bottom: 2px;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .about-aside__list a:hover,
.page-about .about-aside__list a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about p {
    font-size: 16.5px;
  }

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

  .page-about .about-fact__num {
    font-size: 30px;
  }

  .page-about .about-file {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    column-gap: 28px;
    row-gap: 10px;
    align-items: start;
  }

  .page-about .about-file__head {
    grid-column: 1 / -1;
  }

  .page-about .about-metric {
    grid-template-columns: 108px minmax(0, 1fr) 108px;
    grid-template-areas: "name track val";
    gap: 12px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
    column-gap: 32px;
  }

  .page-about .about-metrics {
    padding: 22px 22px 24px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 1000px) {
  .page-about {
    font-size: 17px;
    padding-bottom: 96px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
    padding-bottom: 44px;
  }

  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 60px;
    padding-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    position: relative;
    padding-left: 0;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: 14px;
    width: 2px;
    background: var(--about-hair-strong);
  }

  .page-about .about-rail__node {
    position: relative;
    min-width: 0;
    padding: 0 0 22px 26px;
    border-left: 0;
  }

  .page-about .about-rail__node::before {
    content: "";
    position: absolute;
    left: 0;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--ink);
    border: 2px solid var(--silver);
    transition: background-color 0.18s ease, border-color 0.18s ease;
  }

  .page-about .about-rail__node:hover::before {
    background: var(--lime);
    border-color: var(--lime);
  }

  .page-about .about-rail__node:hover {
    border-left-color: transparent;
  }

  .page-about .about-sec__title {
    padding-left: 20px;
  }

  .page-about .about-flow {
    gap: 72px;
  }

  .page-about .about-files {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
    border-top-width: 3px;
  }

  .page-about .about-file {
    grid-template-columns: minmax(0, 1fr);
    column-gap: 0;
  }

  .page-about .about-file:nth-child(5) {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb a,
  .page-about .about-rail__node,
  .page-about .about-rail__node::before,
  .page-about .about-file,
  .page-about .about-steps li,
  .page-about .about-aside__list a {
    transition: none;
  }
}