.page-about {
  --about-gap: clamp(18px, 3.4vw, 32px);
  --about-panel: var(--ink-800);
  --about-soft: rgba(232, 241, 255, 0.06);
  background: var(--ink-900);
  color: var(--mist);
}

.page-about p {
  margin: 0 0 0.9em;
  line-height: 1.8;
}

.page-about .container {
  max-width: var(--frame-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: var(--bw) solid var(--line);
  background:
    radial-gradient(circle at 84% 14%, rgba(53, 242, 230, 0.12), transparent 56%),
    radial-gradient(circle at 8% 88%, rgba(255, 176, 32, 0.09), transparent 52%),
    linear-gradient(180deg, #0a1b30 0%, var(--ink-900) 100%);
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: var(--line);
}

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

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--slate);
}

.page-about .about-cover {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
  padding-block: clamp(26px, 5vw, 58px) clamp(30px, 5vw, 64px);
}

.page-about .about-kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--amber);
}

.page-about .about-title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.6rem, 9vw, 5.4rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
  color: var(--mist);
}

.page-about .about-title span {
  display: block;
  color: var(--cyan);
}

.page-about .lede {
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-fact {
  border: var(--bw) solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(12, 30, 53, 0.72);
  padding: 10px 14px;
}

.page-about .about-fact dt {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--slate);
  margin-bottom: 4px;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 0.95rem;
  color: var(--mist);
}

.page-about .about-cover-media {
  margin: 0;
  border: var(--bw) solid var(--line);
  box-shadow: var(--shadow-teal);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-cover-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  padding-block: clamp(28px, 4.5vw, 56px) clamp(40px, 6vw, 80px);
}

.page-about .about-rail {
  border: var(--bw) solid var(--line);
  background: var(--about-panel);
  padding: 12px;
}

.page-about .about-rail-title {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--slate);
  margin: 0 0 10px;
}

.page-about .about-rail-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: var(--bw) solid var(--line);
  color: var(--slate);
  text-decoration: none;
  font-size: 0.86rem;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-rail-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  border-color: var(--cyan);
  color: var(--mist);
  background: rgba(53, 242, 230, 0.08);
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  border-top: var(--bw) solid var(--line);
  padding-block: clamp(24px, 4vw, 44px);
}

.page-about .about-section:first-child {
  border-top: none;
  padding-top: 0;
}

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

.page-about .about-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: var(--bw) solid var(--line);
  padding: 3px 8px;
}

.page-about .about-h2 {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--mist);
}

.page-about .about-h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--mist);
}

.page-about .about-section > p {
  color: #c2d3e8;
  max-width: 68ch;
}

.page-about .about-pullquote {
  margin: 22px 0 0;
  border-left: 4px solid var(--amber);
  background: rgba(255, 176, 32, 0.07);
  padding: 14px 18px;
}

.page-about .about-pullquote p {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  line-height: 1.4;
  color: var(--mist);
}

/* ---------- 数据块 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-stat {
  border: var(--bw) solid var(--line);
  background: var(--about-panel);
  padding: 14px 14px 16px;
  box-shadow: 4px 4px 0 rgba(3, 9, 18, 0.9);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--cyan);
  box-shadow: 2px 2px 0 rgba(3, 9, 18, 0.9);
}

.page-about .about-stat-lead {
  grid-column: span 2;
  border-color: var(--cyan);
  background: linear-gradient(140deg, rgba(53, 242, 230, 0.14), rgba(12, 30, 53, 0.95) 62%);
}

.page-about .about-stat-num {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  line-height: 1;
  margin: 0 0 8px;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .about-stat-lead .about-stat-num {
  color: var(--cyan);
  font-size: clamp(2.1rem, 7vw, 2.9rem);
}

.page-about .about-stat-label {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--slate);
  margin: 0;
}

.page-about .about-stat-note {
  margin: 10px 0 0;
  font-size: 0.86rem;
  color: #b9cbe1;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 18px;
  border-left: var(--bw) solid var(--line);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 22px 14px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--cyan);
  border: 2px solid var(--ink-900);
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-tl-item--now::before {
  background: var(--amber);
  box-shadow: 0 0 0 2px var(--amber);
}

.page-about .about-tl-year {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--slate);
  margin-right: 10px;
}

.page-about .about-tl-item--now .about-tl-year {
  color: var(--amber);
}

.page-about .about-tl-text {
  margin: 8px 0 0;
  color: #c2d3e8;
  font-size: 0.96rem;
  max-width: 66ch;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  border: var(--bw) solid var(--line);
  background: var(--about-panel);
  padding: 10px;
  box-shadow: 4px 4px 0 rgba(3, 9, 18, 0.9);
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--slate);
  line-height: 1.6;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-team-card {
  border: var(--bw) solid var(--line);
  background: var(--about-panel);
  border-top: 4px solid var(--teal);
  padding: 16px;
  transition: border-color 0.2s var(--ease);
}

.page-about .about-team-card:hover {
  border-color: var(--cyan);
  border-top-color: var(--amber);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 0.93rem;
  color: #c2d3e8;
}

.page-about .about-shift {
  margin-top: 16px;
  border: var(--bw) dashed var(--cyan);
  background: rgba(53, 242, 230, 0.07);
  padding: 16px;
}

.page-about .about-shift-title {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .about-shift p:last-child {
  margin: 0;
  color: #c2d3e8;
  font-size: 0.94rem;
}

/* ---------- 兼容矩阵 ---------- */
.page-about .about-matrix {
  margin-top: 22px;
  border: var(--bw) solid var(--line);
  background: var(--about-panel);
  padding: 14px;
  overflow-x: auto;
}

.page-about .about-matrix svg {
  display: block;
  width: 100%;
  min-width: 460px;
  height: auto;
}

.page-about .about-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-dot {
  width: 11px;
  height: 11px;
  display: inline-block;
}

.page-about .about-dot--lime { background: var(--lime); }
.page-about .about-dot--amber { background: var(--amber); }
.page-about .about-dot--magenta { background: var(--magenta); }

.page-about .about-note {
  margin-top: 18px;
  padding-left: 12px;
  border-left: 3px solid var(--line);
  font-size: 0.9rem;
  color: var(--slate);
}

/* ---------- 生态 ---------- */
.page-about .about-split {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-split-main {
  border: var(--bw) solid var(--line);
  background: var(--about-panel);
  padding: 16px;
}

.page-about .about-split-main p {
  color: #c2d3e8;
  font-size: 0.94rem;
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 14px 0 0;
}

.page-about .about-link {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--amber);
  color: var(--amber);
}

.page-about .about-split-side {
  border: var(--bw) solid var(--amber);
  background: linear-gradient(160deg, rgba(255, 176, 32, 0.13), rgba(12, 30, 53, 0.96));
  padding: 16px;
}

.page-about .about-award-tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin: 0 0 8px;
}

.page-about .about-award {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: clamp(1.1rem, 3.4vw, 1.35rem);
  line-height: 1.3;
  color: var(--mist);
}

.page-about .about-award-note {
  margin: 0;
  font-size: 0.86rem;
  color: #b9cbe1;
}

/* ---------- 首次访问 ---------- */
.page-about .about-first {
  margin-top: 18px;
  border: var(--bw) solid var(--amber);
  background: var(--about-panel);
  padding: 16px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-first p {
  color: #c2d3e8;
  font-size: 0.94rem;
}

.page-about .about-checklist {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-checklist li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.93rem;
  color: #c2d3e8;
  line-height: 1.7;
}

.page-about .about-tick {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--on-accent);
  background: var(--cyan);
  padding: 2px 6px;
  margin-top: 3px;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 44px);
  border: var(--bw) solid var(--cyan);
  background:
    linear-gradient(135deg, rgba(53, 242, 230, 0.14), rgba(7, 20, 38, 0.96) 70%);
  padding: clamp(18px, 3.6vw, 30px);
  display: grid;
  gap: 18px;
}

.page-about .about-cta-title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  line-height: 1.15;
  margin: 0 0 10px;
  color: var(--mist);
}

.page-about .about-cta-text p {
  margin: 0;
  color: #c2d3e8;
  max-width: 52ch;
  font-size: 0.95rem;
}

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

.page-about .about-btn-ghost {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  border: var(--bw) solid var(--line);
  padding: 12px 20px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-btn-ghost:hover,
.page-about .about-btn-ghost:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-cover {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(28px, 4vw, 52px);
  }

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

  .page-about .about-stat-lead {
    grid-column: span 2;
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

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

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 3.6vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .about-rail-list li {
    flex: 1 1 auto;
  }

  .page-about .about-rail-link {
    white-space: normal;
  }

  .page-about .about-tl-item {
    padding-left: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-link,
  .page-about .about-stat,
  .page-about .about-team-card,
  .page-about .about-link,
  .page-about .about-btn-ghost,
  .page-about .breadcrumb-link {
    transition: none;
  }
}