.page-about {
  --about-cut: 24px;
  --about-card-gap: 14px;
  --about-container: 1240px;
  position: relative;
  background: var(--bg-main);
  color: var(--color-text);
  overflow-x: clip;
}

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

.page-about [id] {
  scroll-margin-top: 90px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  max-width: var(--about-container);
  margin: 0 auto;
  padding: 20px 20px 0;
}

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

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  color: var(--color-dim);
}

.page-about .breadcrumbs li + li::before {
  content: "·";
  color: var(--color-line);
}

.page-about .breadcrumbs a {
  color: var(--color-data);
  text-decoration: none;
  font-family: var(--font-mono);
}

.page-about .breadcrumbs a:hover {
  color: var(--color-neon);
}

/* ---------- 主场宣言 ---------- */
.page-about .manifesto {
  max-width: var(--about-container);
  margin: 0 auto;
  padding: 40px 20px 56px;
}

.page-about .manifesto-inner {
  position: relative;
  padding: 42px 24px 36px;
  background: linear-gradient(140deg, var(--bg-panel) 0%, var(--bg-main) 78%);
  border-left: 4px solid var(--color-neon);
  clip-path: polygon(0 0, calc(100% - 56px) 0, 100% 56px, 100% 100%, 0 100%);
  box-shadow: var(--shadow);
}

.page-about .manifesto-kicker {
  font-family: var(--font-display);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 20px;
}

.page-about .manifesto-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.12;
  color: var(--color-text);
  margin-bottom: 20px;
}

.page-about .manifesto-title span {
  display: block;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1.45;
  color: var(--color-dim);
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--color-line);
}

.page-about .manifesto-lead {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 960px;
  margin-bottom: 20px;
}

.page-about .manifesto-text {
  font-size: .95rem;
  line-height: 1.75;
  color: var(--color-dim);
  max-width: 920px;
  margin-bottom: 28px;
}

.page-about .manifesto-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
}

.page-about .manifesto-index a {
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  padding: 8px 14px;
  background: rgba(17, 27, 61, .72);
  border: 1px solid var(--color-line);
  transition: border-color .2s, background .2s, color .2s;
}

.page-about .manifesto-index a:hover,
.page-about .manifesto-index a:focus-visible {
  border-color: var(--color-neon);
  background: rgba(57, 255, 20, .08);
  color: var(--color-neon);
  outline: none;
}

/* ---------- 区块标题 ---------- */
.page-about .section-head {
  position: relative;
  margin-bottom: 36px;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 700;
  color: var(--color-orange);
  letter-spacing: .14em;
  margin-bottom: 8px;
}

.page-about .section-kicker {
  font-family: var(--font-display);
  font-size: .875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--color-data);
  margin-bottom: 10px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1.25;
  color: var(--color-text);
  margin-bottom: 12px;
}

.page-about .section-subtitle {
  font-size: .95rem;
  line-height: 1.7;
  color: var(--color-dim);
  max-width: 720px;
}

/* ---------- 数据能力概览 ---------- */
.page-about .capability {
  position: relative;
  max-width: var(--about-container);
  margin: 0 auto;
  padding: 56px 20px;
  overflow: hidden;
}

.page-about .capability::before {
  content: "";
  position: absolute;
  inset: 64px 0 0;
  background-image:
    linear-gradient(rgba(30, 43, 79, .5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 43, 79, .5) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .4;
  pointer-events: none;
  z-index: 0;
}

.page-about .capability > * {
  position: relative;
  z-index: 1;
}

/* 统计卡片 */
.page-about .capability-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--about-card-gap);
  margin: 24px 0 32px;
}

.page-about .stat-card {
  padding: 20px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--color-line);
  position: relative;
}

.page-about .stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--color-orange);
}

.page-about .stat-card::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 18px;
  height: 18px;
  border-right: 2px solid var(--color-line);
  border-bottom: 2px solid var(--color-line);
  opacity: .6;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-orange);
  line-height: 1;
  margin-bottom: 10px;
}

.page-about .stat-unit {
  font-family: var(--font-mono);
  font-size: 1rem;
  margin-left: 2px;
  color: var(--color-dim);
}

.page-about .stat-label {
  font-size: .8rem;
  line-height: 1.5;
  color: var(--color-dim);
}

/* 能力面板 */
.page-about .capability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-card-gap);
  margin-bottom: 32px;
}

.page-about .capability-panel {
  padding: 22px 18px;
  border: 1px solid var(--color-line);
  background: var(--bg-panel);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .capability-panel h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--color-text);
}

.page-about .capability-panel p {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--color-dim);
  margin-bottom: 12px;
}

.page-about .capability-panel ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .capability-panel li {
  font-size: .875rem;
  color: var(--color-dim);
  line-height: 1.7;
}

.page-about .capability-panel li::marker {
  color: var(--color-neon);
}

/* ---------- 媒体面板通用 ---------- */
.page-about .media-panel {
  margin: 24px 0;
  background: var(--bg-panel);
  border: 1px solid var(--color-line);
}

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

.page-about .media-panel figcaption {
  padding: 12px 18px;
  font-size: .8rem;
  color: var(--color-dim);
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
}

/* ---------- 发展里程碑 ---------- */
.page-about .timeline {
  max-width: var(--about-container);
  margin: 0 auto;
  padding: 56px 20px;
}

.page-about .timeline-photo {
  margin-bottom: 40px;
}

.page-about .timeline-list {
  position: relative;
  padding-left: 28px;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 32px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-neon), var(--color-line) 80%);
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-neon);
  box-shadow: 0 0 14px rgba(57, 255, 20, .65);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: var(--color-data);
  margin-bottom: 6px;
  letter-spacing: .08em;
}

.page-about .timeline-card {
  padding: 20px 18px;
  background: var(--bg-panel);
  border: 1px solid var(--color-line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-about .timeline-card p {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--color-dim);
  margin: 0;
}

/* ---------- 团队与文化 ---------- */
.page-about .team {
  max-width: var(--about-container);
  margin: 0 auto;
  padding: 56px 20px;
}

.page-about .team-intro {
  display: grid;
  gap: var(--about-card-gap);
  margin-bottom: 32px;
}

.page-about .team-intro p {
  background: var(--bg-panel);
  padding: 20px 18px;
  border: 1px solid var(--color-line);
  font-size: .95rem;
  line-height: 1.8;
  color: var(--color-dim);
  margin: 0;
}

.page-about .team-intro p:first-child {
  border-left: 4px solid var(--color-neon);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-card-gap);
  margin-bottom: 32px;
}

.page-about .culture-card {
  padding: 22px 18px;
  background: var(--bg-panel);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-line);
  transition: border-color .2s, background .2s, transform .2s;
}

.page-about .culture-card:hover,
.page-about .culture-card:focus-within {
  border-left-color: var(--color-neon);
  background: rgba(17, 27, 61, .88);
  transform: translateY(-4px);
}

.page-about .culture-index {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  color: var(--color-orange);
  margin-bottom: 12px;
}

.page-about .culture-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 10px;
}

.page-about .culture-card p:not(.culture-index):not(.culture-tag) {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--color-dim);
  margin-bottom: 12px;
}

.page-about .culture-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  color: var(--color-neon);
  border: 1px solid var(--color-line);
  padding: 4px 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
  transition: border-color .2s, box-shadow .2s;
}

.page-about .culture-card:hover .culture-tag {
  border-color: var(--color-neon);
  box-shadow: 0 0 10px rgba(57, 255, 20, .35);
}

/* ---------- 相关页面入口 ---------- */
.page-about .about-links {
  max-width: var(--about-container);
  margin: 0 auto;
  padding: 48px 20px 72px;
}

.page-about .links-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .links-cards a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  background: var(--bg-panel);
  border: 1px solid var(--color-line);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
  transition: background .2s, border-color .2s;
}

.page-about .links-cards a::after {
  content: "→";
  color: var(--color-data);
  font-family: var(--font-mono);
  font-weight: 400;
}

.page-about .links-cards a:hover,
.page-about .links-cards a:focus-visible {
  background: rgba(57, 255, 20, .08);
  border-color: var(--color-neon);
  outline: none;
}

/* ---------- 滚动显现协议（渐进增强） ---------- */
.page-about [data-reveal] {
  transition: opacity .6s ease, transform .6s ease;
}

.page-about [data-reveal="pending"] {
  opacity: 0;
  transform: translateY(24px);
}

.page-about [data-reveal="visible"] {
  opacity: 1;
  transform: none;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .manifesto-inner {
    padding: 56px 40px 44px;
  }

  .page-about .capability-stats {
    gap: 20px;
  }

  .page-about .stat-card {
    padding: 28px 24px;
  }

  .page-about .stat-num {
    font-size: 2.75rem;
  }

  .page-about .team-intro {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .page-about .links-cards {
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .breadcrumbs {
    padding-top: 28px;
  }

  .page-about .manifesto {
    padding-top: 56px;
  }

  .page-about .manifesto-title {
    font-size: clamp(2.6rem, 5vw, 4rem);
  }

  .page-about .manifesto-lead {
    font-size: 1.5rem;
  }

  .page-about .capability {
    padding-top: 72px;
  }

  .page-about .capability-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .page-about .section-title {
    font-size: 2.25rem;
  }

  /* 时间线左右交错 */
  .page-about .timeline-list {
    padding-left: 0;
  }

  .page-about .timeline-list::before {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    background: linear-gradient(180deg, var(--color-neon) 0%, var(--color-line) 40%, var(--color-line) 85%, var(--color-neon) 100%);
  }

  .page-about .timeline-item {
    width: calc(50% - 64px);
    margin-left: auto;
    margin-right: 0;
    margin-bottom: 52px;
  }

  .page-about .timeline-item:nth-child(odd) {
    margin-left: 0;
    margin-right: auto;
  }

  .page-about .timeline-item::before {
    left: auto;
    right: -69px;
  }

  .page-about .timeline-item:nth-child(odd)::before {
    right: auto;
    left: -69px;
  }

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

  .page-about .timeline-item:nth-child(odd) .timeline-card {
    text-align: left;
  }

  .page-about .links-cards {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1240px) {
  .page-about {
    --about-card-gap: 20px;
  }

  .page-about .manifesto-inner {
    padding-left: 64px;
  }

  .page-about .capability-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .capability-panel {
    padding: 28px 26px;
  }

  .page-about .culture-card {
    padding: 28px 26px;
  }

  .page-about .team-intro p {
    padding: 28px 26px;
  }
}