.page-about {
  --about-rail-w: 208px;
  --about-gap: clamp(56px, 8vw, 116px);
  --about-radius: var(--radius-lg);
}

/* ---------- 顶部路径 ---------- */
.page-about .about-topbar {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(16px, 3vw, 34px);
  padding-bottom: clamp(36px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(43, 52, 68, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 52, 68, 0.32) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(130% 90% at 18% 0%, #000 8%, transparent 68%);
  mask-image: radial-gradient(130% 90% at 18% 0%, #000 8%, transparent 68%);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero-title {
  font-size: clamp(29px, 5.4vw, 56px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  max-width: 17ch;
  transform: skewX(-2deg);
  transform-origin: left center;
}

.page-about .about-hero-lead {
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  position: relative;
  padding: 18px 16px 20px;
  border-radius: var(--about-radius);
  background: var(--panel);
  border: 1px solid var(--grid);
  overflow: hidden;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(47, 107, 255, 0.6), transparent);
}

.page-about .about-stat-num {
  display: block;
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

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

.page-about .section-nav {
  position: sticky;
  top: calc(var(--header-h) + 8px);
  z-index: 12;
  background: rgba(7, 9, 12, 0.88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  padding: 8px;
}

.page-about .section-nav-title {
  display: none;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 12px;
}

.page-about .section-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .section-nav-list::-webkit-scrollbar {
  display: none;
}

.page-about .section-nav-link {
  position: relative;
  display: block;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.3;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .section-nav-link:hover {
  color: var(--white);
}

.page-about .section-nav-link[aria-current="true"] {
  color: var(--white);
  background: var(--ember);
}

/* ---------- 正文流 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 32px);
}

.page-about .about-chapter-head {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  border-top: 1px solid var(--grid);
  padding-top: 20px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-chapter-head::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-chapter-num {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
  padding-top: 7px;
}

.page-about .about-chapter-title {
  margin: 0;
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-chapter p {
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-chapter p + p {
  margin-top: 1.2em;
}

.page-about .about-lead-p {
  color: var(--white) !important;
  font-size: clamp(16px, 1.6vw, 18px);
  max-width: 64ch;
}

/* ---------- 01 起点 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-split-text p {
  max-width: 62ch;
}

.page-about .about-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.16);
}

.page-about .about-split-media {
  margin: 0;
}

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

/* ---------- 02 覆盖版图 ---------- */
.page-about .about-map-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

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

.page-about .about-city-grid {
  list-style: none;
  margin: clamp(24px, 4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: 8px;
}

.page-about .about-city {
  padding: 10px 6px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--grid);
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.3;
  text-align: center;
  cursor: default;
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease),
    background-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-city:hover,
.page-about .about-city:focus-visible {
  color: var(--white);
  border-color: var(--orange);
  background: var(--ember);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-cat-band {
  margin-top: clamp(28px, 4vw, 40px);
  padding: 22px 20px;
  border-radius: var(--about-radius);
  border: 1px solid var(--grid);
  background: linear-gradient(135deg, rgba(16, 20, 28, 0.9), rgba(7, 9, 12, 0.9));
}

.page-about .about-cat-label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .about-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-tags li {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--grid);
  background: var(--panel);
  color: var(--white);
  font-size: 14px;
  line-height: 1.3;
}

.page-about .about-cat-note {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
  max-width: 64ch;
}

/* ---------- 03 内容与数据 ---------- */
.page-about .about-modules {
  margin-top: clamp(24px, 4vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-module {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--about-radius);
  border: 1px solid var(--grid);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .about-module::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--orange);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.4s var(--ease);
}

.page-about .about-module:hover {
  border-color: rgba(255, 106, 26, 0.45);
  transform: translateY(-3px);
}

.page-about .about-module:hover::after {
  transform: scaleY(1);
}

.page-about .about-module-index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .about-module-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

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

.page-about .about-partner-line {
  margin-top: clamp(24px, 4vw, 32px);
}

.page-about .about-partner-line p {
  margin: 0;
  color: var(--white);
  line-height: 1.85;
  font-size: 15px;
}

.page-about .about-figure {
  color: var(--orange);
  font-weight: 700;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-team-media {
  margin: 0;
}

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

.page-about .about-team-body > p {
  max-width: 62ch;
}

.page-about .about-tags--team {
  margin-top: 22px;
}

.page-about .about-team-list {
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-team-item {
  padding: 16px 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-team-item:last-child {
  border-bottom: 1px solid var(--grid);
}

.page-about .about-team-item dt {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.page-about .about-team-item dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 05 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0 0 0 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    var(--orange),
    var(--blue) 50%,
    var(--green) 92%,
    transparent
  );
  opacity: 0.62;
}

.page-about .about-tl {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-tl-node {
  position: absolute;
  left: -34px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--orange);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-tl-card {
  padding: 18px 20px;
  border-radius: var(--about-radius);
  border: 1px solid var(--grid);
  background: var(--panel);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .about-tl:hover .about-tl-node,
.page-about .about-tl:focus-within .about-tl-node {
  background: var(--orange);
  box-shadow: 0 0 0 6px rgba(255, 106, 26, 0.18);
}

.page-about .about-tl:hover .about-tl-card,
.page-about .about-tl:focus-within .about-tl-card {
  border-color: rgba(255, 106, 26, 0.45);
  transform: translateX(4px);
}

.page-about .about-tl-meta {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-tl-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-tl-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 06 长期投入 ---------- */
.page-about .about-pledge-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-pledge {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--about-radius);
  border: 1px solid var(--grid);
  background: var(--panel);
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .about-pledge:hover {
  transform: translateY(-3px);
  border-color: rgba(47, 107, 255, 0.5);
}

.page-about .about-pledge-num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--grid);
  margin-bottom: 14px;
}

.page-about .about-pledge h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

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

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 72px);
  margin-bottom: clamp(56px, 8vw, 96px);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--about-radius);
  border: 1px solid var(--grid);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(255, 106, 26, 0.16), transparent 58%),
    linear-gradient(135deg, var(--panel), var(--ink));
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .about-cta-title {
  margin: 10px 0 12px;
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--white);
  max-width: 22ch;
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-cta-link {
  color: var(--blue);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-cta-link:hover {
  color: var(--white);
  border-bottom-color: var(--orange);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-modules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(240px, 4fr);
    align-items: end;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-rail {
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .section-nav {
    position: static;
    background: transparent;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    border: none;
    border-radius: 0;
    padding: 0;
  }

  .page-about .section-nav-title {
    display: block;
  }

  .page-about .section-nav-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .section-nav-link {
    padding: 10px 14px 10px 20px;
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
  }

  .page-about .section-nav-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 10px;
    height: 2px;
    background: var(--grid);
    transform: translateY(-50%);
    transition: width 0.3s var(--ease), background-color 0.3s var(--ease);
  }

  .page-about .section-nav-link[aria-current="true"] {
    background: transparent;
    color: var(--white);
  }

  .page-about .section-nav-link[aria-current="true"]::before {
    width: 18px;
    background: var(--orange);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-city,
  .page-about .about-module,
  .page-about .about-pledge,
  .page-about .about-tl-card,
  .page-about .about-tl-node,
  .page-about .section-nav-link,
  .page-about .section-nav-link::before {
    transition: none;
  }

  .page-about .about-city:hover,
  .page-about .about-city:focus-visible,
  .page-about .about-module:hover,
  .page-about .about-pledge:hover,
  .page-about .about-tl:hover .about-tl-card,
  .page-about .about-tl:focus-within .about-tl-card {
    transform: none;
  }
}