/* =========================================================
   品牌文化页 / page-about
   ========================================================= */

.page-about {
  --about-dark-line: rgba(199, 205, 214, 0.18);
  --about-light-line: rgba(11, 14, 19, 0.12);
  --about-gap: 20px;

  background: var(--ink);
  color: var(--on-dark);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about p,
.page-about dl,
.page-about dd,
.page-about figure {
  margin: 0;
}

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

.page-about img {
  display: block;
  max-width: 100%;
}

.page-about .img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--about-dark-line);
  background: var(--deep-2);
  width: 100%;
}

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

.page-about .img-caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--on-dark-2);
  background: rgba(8, 27, 47, 0.78);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  padding-top: calc(var(--head-h) + 26px);
  padding-bottom: 48px;
  border-bottom: 1px solid var(--about-dark-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(199, 205, 214, 0.07) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, rgba(199, 205, 214, 0.07) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

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

.page-about .about-crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--on-dark-3);
}

.page-about .about-crumbs-list li + li::before {
  content: "/";
  margin: 0 12px;
  color: var(--on-dark-3);
}

.page-about .about-crumbs-list a {
  color: var(--on-dark-3);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-crumbs-list a:hover,
.page-about .about-crumbs-list a:focus-visible {
  color: var(--aurora);
  border-bottom-color: var(--aurora);
}

.page-about .about-crumbs-list [aria-current="page"] {
  color: var(--on-dark);
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
  margin-bottom: 20px;
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7.2vw, 76px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--on-dark);
  margin-bottom: 22px;
  text-wrap: balance;
}

.page-about .about-lead {
  max-width: 34em;
  font-size: 17px;
  color: var(--on-dark-2);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 30px;
}

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

.page-about .about-hero-side {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .about-vert {
  writing-mode: vertical-rl;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.18em;
  color: var(--on-dark-3);
  max-height: 240px;
}

.page-about .about-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-left: auto;
  min-width: 128px;
}

.page-about .about-meta-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--about-dark-line);
  font-size: 13px;
  color: var(--on-dark-3);
}

.page-about .about-meta-item dd {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--gold);
}

/* ---------- 章节头 ---------- */

.page-about .about-sec-head {
  margin-bottom: 36px;
}

.page-about .about-sec-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.page-about .about-sec-num {
  padding: 2px 7px;
  line-height: 1.25;
  border: 1px solid currentColor;
  color: var(--gold-2);
}

.page-about .about-sec-tag {
  color: var(--rock);
}

.page-about .about-sec-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5.2vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .about-sec-note {
  margin-top: 14px;
  max-width: 46em;
  font-size: 15px;
  color: var(--rock);
}

/* ---------- 01 主张拆解 ---------- */

.page-about .about-claims,
.page-about .about-timeline-sec,
.page-about .about-gov,
.page-about .about-team,
.page-about .about-land {
  padding: 56px 0;
}

.page-about .about-claims {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-claims-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .about-claim {
  padding: 22px 0;
  border-top: 1px solid var(--about-light-line);
}

.page-about .about-claim:last-child {
  border-bottom: 1px solid var(--about-light-line);
}

.page-about .about-claim-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 12px;
}

.page-about .about-claim-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5.4vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-claim-en {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-2);
}

.page-about .about-claim-text {
  max-width: 40em;
  margin-bottom: 14px;
  font-size: 16px;
  color: var(--rock);
}

.page-about .about-claim-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--aurora-2);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.18s var(--ease), opacity 0.18s var(--ease);
}

.page-about .about-claim-link:hover,
.page-about .about-claim-link:focus-visible {
  color: var(--ink);
}

.page-about .about-claims-figure {
  aspect-ratio: 4 / 5;
}

/* ---------- 02 发展节点 ---------- */

.page-about .about-timeline-sec {
  background: var(--white);
  color: var(--ink);
}

.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
}

.page-about .about-tl-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding-bottom: 18px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--about-light-line);
}

.page-about .about-tl-nav-link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--rock);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-tl-nav-link:hover,
.page-about .about-tl-nav-link:focus-visible {
  color: var(--aurora-2);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 36px 26px;
  border-left: 1px solid var(--about-light-line);
  scroll-margin-top: calc(var(--head-h) + 24px);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--gold-2);
  transform: rotate(45deg);
}

.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold-2);
  margin-bottom: 8px;
}

.page-about .about-tl-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.35;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .about-tl-body p {
  max-width: 42em;
  font-size: 15px;
  color: var(--rock);
}

.page-about .about-band {
  margin-top: 44px;
  aspect-ratio: 16 / 7;
}

/* ---------- 03 内容治理 ---------- */

.page-about .about-gov {
  background: var(--deep);
  color: var(--on-dark);
}

.page-about .about-gov .about-sec-num,
.page-about .about-land .about-sec-num {
  color: var(--gold);
}

.page-about .about-gov .about-sec-tag,
.page-about .about-land .about-sec-tag {
  color: var(--on-dark-3);
}

.page-about .about-gov .about-sec-title,
.page-about .about-land .about-sec-title {
  color: var(--on-dark);
}

.page-about .about-gov .about-sec-note {
  color: var(--on-dark-2);
}

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

.page-about .about-gov-card {
  padding: 22px 0;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .about-gov-cycle {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .about-gov-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.35;
  color: var(--on-dark);
  margin-bottom: 8px;
}

.page-about .about-gov-text {
  max-width: 32em;
  font-size: 15px;
  color: var(--on-dark-2);
}

.page-about .about-layers {
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .about-layers-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--on-dark);
  margin-bottom: 18px;
}

.page-about .about-layer-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-layer {
  border: 1px solid var(--about-dark-line);
  background: rgba(8, 27, 47, 0.55);
}

.page-about .about-layer-sum {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--on-dark);
  cursor: pointer;
  list-style: none;
}

.page-about .about-layer-sum::-webkit-details-marker {
  display: none;
}

.page-about .about-layer-sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--aurora);
}

.page-about .about-layer[open] .about-layer-sum::after {
  content: "−";
}

.page-about .about-layer-text {
  padding: 0 16px 16px;
  font-size: 14px;
  color: var(--on-dark-2);
}

/* ---------- 04 团队与分工 ---------- */

.page-about .about-team {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--about-light-line);
}

.page-about .about-team-col {
  padding: 24px 0;
  border-bottom: 1px solid var(--about-light-line);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-2);
  margin-bottom: 10px;
}

.page-about .about-team-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .about-team-desc {
  max-width: 26em;
  font-size: 15px;
  color: var(--rock);
  margin-bottom: 14px;
}

.page-about .about-team-out li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-team-out li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 7px;
  height: 1px;
  background: var(--gold-2);
}

/* ---------- 05 属地表达 ---------- */

.page-about .about-land {
  background: var(--ink);
  color: var(--on-dark);
  padding-bottom: 0;
}

.page-about .about-land-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-land-body p {
  max-width: 42em;
  font-size: 16px;
  color: var(--on-dark-2);
  margin-bottom: 16px;
}

.page-about .about-land-list {
  margin: 22px 0;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .about-land-list li {
  position: relative;
  padding: 12px 0 12px 18px;
  font-size: 15px;
  color: var(--on-dark-2);
  border-bottom: 1px solid var(--about-dark-line);
}

.page-about .about-land-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-land-boundary {
  align-self: start;
  padding: 20px;
  border: 1px solid var(--about-dark-line);
}

.page-about .about-land-boundary-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .about-land-boundary p + p {
  font-size: 15px;
  color: var(--on-dark-2);
}

.page-about .about-land-figure {
  position: relative;
  margin-top: 52px;
  border: 0;
  overflow: hidden;
  background: var(--deep-2);
  aspect-ratio: 3 / 2;
}

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

.page-about .about-land-overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 20px;
  background: linear-gradient(to top, rgba(8, 27, 47, 0.94), rgba(8, 27, 47, 0) 100%);
}

.page-about .about-land-line {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 4.4vw, 34px);
  line-height: 1.25;
  color: var(--on-dark);
  margin-bottom: 10px;
}

.page-about .about-land-sub {
  max-width: 46em;
  font-size: 14px;
  color: var(--on-dark-2);
  margin-bottom: 16px;
}

.page-about .about-land-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--aurora);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: opacity 0.18s var(--ease);
}

.page-about .about-land-link:hover,
.page-about .about-land-link:focus-visible {
  opacity: 0.72;
}

/* ---------- 断点 ---------- */

@media (min-width: 768px) {
  .page-about {
    --about-gap: 28px;
  }

  .page-about .about-claims,
  .page-about .about-timeline-sec,
  .page-about .about-gov,
  .page-about .about-team,
  .page-about .about-land {
    padding: 88px 0;
  }

  .page-about .about-land {
    padding-bottom: 0;
  }

  .page-about .about-gov-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-layer-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-gap: 32px;
  }

  .page-about .about-hero {
    padding-top: calc(var(--head-h) + 40px);
    padding-bottom: 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    margin-top: 44px;
  }

  .page-about .about-hero-side {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    min-height: 210px;
    padding-top: 0;
    padding-left: 28px;
    border-top: 0;
    border-left: 1px solid var(--about-dark-line);
  }

  .page-about .about-sec-head {
    margin-bottom: 48px;
  }

  .page-about .about-claims-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-claims-figure {
    margin-top: 26px;
  }

  .page-about .about-timeline {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 56px;
  }

  .page-about .about-tl-nav {
    position: sticky;
    top: calc(var(--head-h) + 28px);
    align-self: start;
    flex-direction: column;
    gap: 16px;
    padding: 0 0 0 16px;
    margin-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-light-line);
  }

  .page-about .about-tl-item {
    padding-left: 30px;
    padding-bottom: 44px;
  }

  .page-about .about-band {
    aspect-ratio: 20 / 7;
    margin-top: 56px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .page-about .about-team-col {
    padding: 30px 34px;
    border-bottom: 0;
  }

  .page-about .about-team-col:first-child {
    padding-left: 0;
  }

  .page-about .about-team-col:last-child {
    padding-right: 0;
  }

  .page-about .about-team-col + .about-team-col {
    border-left: 1px solid var(--about-light-line);
  }

  .page-about .about-land-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .about-land-figure {
    aspect-ratio: 24 / 9;
    margin-top: 72px;
  }

  .page-about .about-land-overlay {
    padding: 52px 56px;
  }

  .page-about .about-land-line,
  .page-about .about-land-sub {
    max-width: 620px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-claim-link,
  .page-about .about-land-link,
  .page-about .about-tl-nav-link,
  .page-about .about-crumbs-list a {
    transition: none;
  }
}