.page-about {
  --about-rail: 258px;
  --about-hero-min: clamp(26rem, 62vw, 42rem);
}

/* ---------- 面包屑上下留白 ---------- */
.page-about .crumb {
  padding-block: var(--sp-3) 0;
}

/* ---------- 首屏刊头 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: end;
  min-height: var(--about-hero-min);
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(2rem, 5vw, 3.5rem);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.09) 1px, transparent 1px);
  background-size: 52px 52px;
  mix-blend-mode: screen;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(6, 26, 51, 0.28) 0%, rgba(6, 26, 51, 0.86) 56%, #061A33 100%),
    linear-gradient(90deg, rgba(6, 26, 51, 0.9) 0%, rgba(6, 26, 51, 0) 68%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 0.76rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-hero__title {
  font-family: var(--f-display);
  font-size: clamp(2rem, 5.6vw, 3.75rem);
  letter-spacing: 0.045em;
  line-height: 1.08;
  color: var(--c-star);
  margin: var(--sp-2) 0 var(--sp-3);
  max-width: 17ch;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  font-family: var(--f-serif);
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  line-height: 1.92;
  color: var(--c-star);
  opacity: 0.94;
  max-width: 58ch;
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-3);
  margin-top: clamp(2rem, 4.5vw, 3rem);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--c-line-cyan);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--f-mono);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--c-amber);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--c-mist);
}

/* ---------- 左右分屏外壳 ---------- */
.page-about .page-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-5);
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(3rem, 8vw, 6rem);
}

/* ---------- 左侧章节索引 ---------- */
.page-about .rail {
  align-self: start;
}

.page-about .rail__label {
  display: block;
  margin: 0 0 var(--sp-2);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
}

.page-about .rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.5rem 0.7rem;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  color: var(--c-mist);
  font-size: 0.86rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease),
    background var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link:focus-visible {
  color: var(--c-star);
  background: rgba(34, 211, 238, 0.08);
  border-left-color: var(--c-cyan);
  outline: none;
}

.page-about .rail__num {
  flex: none;
  font-family: var(--f-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(2rem, 4.5vw, 3.25rem);
  border-top: 1px solid var(--c-line-soft);
}

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

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--sp-3);
  align-items: baseline;
  margin-bottom: var(--sp-4);
}

.page-about .about-head__num {
  font-family: var(--f-mono);
  font-size: clamp(1rem, 2vw, 1.28rem);
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(1.35rem, 3vw, 2rem);
  letter-spacing: 0.03em;
  line-height: 1.22;
  color: var(--c-star);
  text-wrap: balance;
}

.page-about .about-prose {
  font-family: var(--f-serif);
  font-size: 1rem;
  line-height: 1.92;
  color: var(--c-star);
  max-width: var(--w-read);
}

.page-about .about-prose p {
  margin: 0 0 1rem;
}

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

.page-about .about-note {
  margin: var(--sp-3) 0 0;
  padding: 0.8rem 1rem;
  border-left: 2px solid var(--c-cyan);
  background: rgba(34, 211, 238, 0.06);
  font-family: var(--f-mono);
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--c-mist);
  max-width: var(--w-read);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: var(--sp-4) 0 0;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--c-navy-deep);
}

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

.page-about .about-figure figcaption {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 0.76rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

/* ---------- 省级覆盖表 ---------- */
.page-about .about-table-wrap {
  margin-top: var(--sp-4);
  overflow-x: auto;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: rgba(12, 37, 71, 0.42);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .about-table caption {
  caption-side: top;
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--c-line-cyan);
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-table th,
.page-about .about-table td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 1rem;
  line-height: 1.65;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .about-table thead th {
  font-family: var(--f-mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover {
  background: rgba(34, 211, 238, 0.05);
}

.page-about .about-region {
  font-family: var(--f-display);
  font-size: 0.98rem;
  letter-spacing: 0.06em;
  color: var(--c-star);
  white-space: nowrap;
}

.page-about .about-prov {
  color: var(--c-mist);
  min-width: 15rem;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

/* ---------- 直营 / 授权双栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.page-about .about-card {
  padding: var(--sp-3);
  background: var(--c-navy);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
}

.page-about .about-card--direct {
  border-top: 3px solid var(--c-amber);
}

.page-about .about-card--auth {
  border-top: 3px solid var(--c-cyan);
}

.page-about .about-card__title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 0 0 var(--sp-3);
  font-family: var(--f-display);
  font-size: 1.12rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--c-star);
}

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

.page-about .about-list li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.1rem;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--c-mist);
  border-bottom: 1px dashed var(--c-line-soft);
}

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

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 6px;
  height: 6px;
  background: var(--c-mist);
  opacity: 0.65;
}

.page-about .about-card--direct .about-list li::before {
  background: var(--c-amber);
  opacity: 1;
}

.page-about .about-card--auth .about-list li::before {
  background: var(--c-cyan);
  opacity: 1;
}

/* ---------- 行动按钮组 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--sp-4);
}

/* ---------- 发展历程时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.35rem;
  padding-block: var(--sp-3);
  border-top: 1px dashed var(--c-line);
}

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

.page-about .about-timeline__mark {
  font-family: var(--f-mono);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  color: var(--c-amber);
}

.page-about .about-timeline__title {
  margin: 0 0 0.4rem;
  font-family: var(--f-display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--c-star);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--c-mist);
}

/* ---------- 合作角色 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.page-about .about-role {
  padding: var(--sp-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: linear-gradient(158deg, rgba(12, 37, 71, 0.9) 0%, rgba(8, 31, 60, 0.55) 100%);
}

.page-about .about-role__kicker {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-role__title {
  margin: 0.55rem 0 0.6rem;
  font-family: var(--f-display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--c-star);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 平板 ---------- */
@media (min-width: 48rem) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--sp-4);
  }

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

  .page-about .about-timeline__item {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: var(--sp-3);
    align-items: start;
  }

  .page-about .about-timeline__mark {
    padding-top: 0.2rem;
  }

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

/* ---------- 桌面：左侧索引固定 ---------- */
@media (min-width: 62rem) {
  .page-about .page-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-about .rail {
    position: sticky;
    top: 6.5rem;
    max-height: calc(100vh - 9rem);
    overflow-y: auto;
    padding-right: var(--sp-2);
  }

  .page-about .rail__list {
    display: block;
    gap: 0;
  }

  .page-about .rail__link {
    display: flex;
    padding: 0.6rem 0.75rem 0.6rem 0.9rem;
  }

  .page-about .about-sec {
    padding-block: clamp(2.5rem, 4vw, 4rem);
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .rail__link {
    transition: none;
  }
}