.page-about {
  --about-index-w: 132px;
  --about-gap: 48px;
  background: var(--navy);
  color: var(--ink);
  padding-bottom: 96px;
}

.page-about .about-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ============ 首屏 ============ */
.page-about .about-mast {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 100% at 8% 0%, rgba(255, 106, 33, 0.16), transparent 55%),
    radial-gradient(90% 90% at 100% 10%, rgba(44, 232, 208, 0.10), transparent 58%),
    var(--navy);
}

.page-about .about-mast::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 96px);
  opacity: 0.28;
  pointer-events: none;
}

.page-about .about-mast-inner {
  position: relative;
  padding-top: 108px;
  padding-bottom: 44px;
}

.page-about .about-crumb {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 26px;
}

.page-about .about-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .about-crumb span[aria-hidden] {
  margin: 0 8px;
  color: var(--line);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker-dot {
  width: 6px;
  height: 6px;
  display: inline-block;
  background: var(--orange);
  animation: about-pulse 2.4s var(--ease) infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.page-about .about-h1 {
  margin: 0 0 20px;
  max-width: 900px;
  font-size: clamp(30px, 6vw, 60px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-lede {
  margin: 0 0 38px;
  max-width: 660px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--navy-2);
  padding: 18px 16px;
}

.page-about .about-stat-num {
  margin: 0 0 8px;
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-family: var(--font-num);
  font-size: 30px;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-stat-unit {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-stat-label {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .about-mast-inner {
    padding-top: 132px;
    padding-bottom: 56px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============ 主体骨架 ============ */
.page-about .about-body {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px 20px 0;
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
    padding-top: 76px;
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* ============ 章节索引 ============ */
.page-about .about-index {
  margin: 0 0 40px;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-index-list > li {
  flex: 0 0 auto;
}

.page-about .about-index-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-index-link:hover {
  color: var(--ink);
  border-color: var(--cyan);
}

.page-about .idx-num {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

@media (min-width: 1024px) {
  .page-about .about-index {
    position: sticky;
    top: 88px;
    margin-bottom: 0;
  }
  .page-about .about-index-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }
  .page-about .about-index-list > li {
    flex: none;
  }
  .page-about .about-index-list > li + li {
    margin-top: 4px;
  }
  .page-about .about-index-link {
    display: block;
    padding: 6px 0 6px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    line-height: 1.5;
    white-space: normal;
  }
  .page-about .idx-num {
    display: block;
    margin-bottom: 2px;
  }
  .page-about .about-index-link.is-active,
  .page-about .about-index-link:hover {
    color: var(--ink);
    border-left-color: var(--orange);
  }
  .page-about .about-index-link.is-active .idx-num,
  .page-about .about-index-link:hover .idx-num {
    color: var(--orange);
  }
}

/* ============ 章节通用 ============ */
.page-about .about-sec {
  border-top: 1px solid var(--line);
  padding: 40px 0 52px;
  scroll-margin-top: 84px;
}

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

.page-about .about-sec-head {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  margin-bottom: 26px;
}

.page-about .about-sec-num {
  display: block;
  width: 32px;
  padding-top: 8px;
  border-top: 2px solid var(--orange);
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-sec-title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .about-sec-lede {
  margin: 0;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-para {
  margin: 0 0 14px;
  max-width: 680px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 232, 208, 0.45);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

@media (min-width: 700px) {
  .page-about .about-sec-head {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 20px;
  }
}

/* ============ 01 内容主线 ============ */
.page-about .line-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .line-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px 20px;
  background: var(--navy-2);
  border-left: 3px solid var(--accent, var(--cyan));
  transition: background-color 0.25s var(--ease);
}

.page-about .line-card:hover {
  background: var(--navy-3);
}

.page-about .line-card--report { --accent: var(--orange); }
.page-about .line-card--status { --accent: var(--amber); }
.page-about .line-card--local { --accent: var(--teal); }
.page-about .line-card--feedback { --accent: var(--magenta); }

.page-about .line-card-title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.page-about .line-card-desc {
  flex: 1;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .line-card-link {
  align-self: flex-start;
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--accent, var(--cyan));
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.2s var(--ease);
}

.page-about .line-card-link:hover {
  color: var(--ink);
}

@media (min-width: 640px) {
  .page-about .line-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .line-card {
    padding: 26px 24px 22px;
  }
}

/* ============ 02 团队与分工 ============ */
.page-about .team-layout {
  display: grid;
  gap: 20px;
}

.page-about .team-matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  background: var(--navy-2);
  padding: 20px 18px;
  border-top: 2px solid var(--cell-accent, var(--cyan));
  transition: background-color 0.25s var(--ease);
}

.page-about .team-cell:hover {
  background: var(--navy-3);
}

.page-about .team-cell--data { --cell-accent: var(--orange); }
.page-about .team-cell--content { --cell-accent: var(--cyan); }
.page-about .team-cell--product { --cell-accent: var(--amber); }
.page-about .team-cell--service { --cell-accent: var(--magenta); }

.page-about .team-cell-role {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .team-cell-count {
  margin: 0 0 8px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-num);
  font-size: 26px;
  color: var(--cell-accent, var(--cyan));
}

.page-about .team-count-unit {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .team-cell-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 560px) {
  .page-about .team-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 28px;
    align-items: start;
  }
}

/* ============ 图片 ============ */
.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--navy-3);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-figure--team img { aspect-ratio: 3 / 2; }
.page-about .about-figure--flow img { aspect-ratio: 10 / 7; }
.page-about .about-figure--cover img { aspect-ratio: 3 / 2; }

.page-about .about-figure--flow {
  margin-top: 22px;
}

.page-about .about-figure--cover {
  margin-bottom: 22px;
}

.page-about .about-figure-cap {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ============ 03 生产流程 ============ */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .flow-step {
  position: relative;
  background: var(--navy-2);
  padding: 22px 18px 20px;
}

.page-about .flow-idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .flow-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .flow-time {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .flow-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .flow-step {
    padding: 24px 20px 22px;
  }
  .page-about .flow-step::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -7px;
    width: 0;
    height: 0;
    border-left: 7px solid var(--orange);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    transform: translateY(-50%);
    z-index: 2;
  }
  .page-about .flow-step:last-child::after {
    display: none;
  }
}

/* ============ 04 发展阶段 ============ */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 30px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--cyan);
  background: var(--navy);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--orange);
  border-color: var(--orange);
  transform: scale(1.25);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  transition: color 0.2s var(--ease);
}

.page-about .tl-item:hover .tl-title {
  color: var(--cyan);
}

.page-about .tl-desc {
  margin: 0;
  max-width: 620px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 05 本地覆盖 ============ */
.page-about .partner-grid {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-cell {
  background: var(--navy-2);
  padding: 20px 18px;
  border-left: 2px solid var(--partner-accent, var(--cyan));
  transition: background-color 0.25s var(--ease);
}

.page-about .partner-cell:hover {
  background: var(--navy-3);
}

.page-about .partner-cell--org { --partner-accent: var(--cyan); }
.page-about .partner-cell--venue { --partner-accent: var(--amber); }
.page-about .partner-cell--data { --partner-accent: var(--orange); }

.page-about .partner-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
}

.page-about .partner-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============ 06 站点信息 ============ */
.page-about .entity-list {
  margin: 0 0 24px;
  border-top: 1px solid var(--line);
}

.page-about .entity-row {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .entity-row dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .entity-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

@media (min-width: 700px) {
  .page-about .entity-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ============ 收尾 ============ */
.page-about .about-cta {
  margin-top: 40px;
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background:
    linear-gradient(120deg, rgba(255, 106, 33, 0.10), rgba(10, 22, 38, 0) 62%),
    var(--navy-2);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-cta-text {
  margin: 0 0 18px;
  max-width: 560px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 700px) {
  .page-about .about-cta {
    padding: 32px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-kicker-dot {
    animation: none;
  }
  .page-about .about-index-link,
  .page-about .line-card,
  .page-about .line-card-link,
  .page-about .team-cell,
  .page-about .tl-item::before,
  .page-about .tl-title,
  .page-about .partner-cell,
  .page-about .about-inline-link {
    transition: none;
  }
}