/* ===== 平台介绍页 · page-about ===== */
.page-about {
  --about-rail: 152px;
  --about-pad: clamp(24px, 5vw, 48px);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(28px, 5vw, 56px) clamp(40px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(27, 77, 228, 0.07), transparent 60%),
    radial-gradient(90% 70% at 0% 8%, rgba(232, 51, 42, 0.07), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.9fr);
  }
}

.page-about .breadcrumb {
  margin-bottom: 20px;
}

.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.2vw, 48px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 40em;
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--blue);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-mute);
  max-width: 38em;
}

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

.page-about .about-hero__visual {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(16px, 3vw, 26px);
  box-shadow: var(--sh-card);
}

.page-about .about-plot {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .plot-grid line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .plot-dots .is-red {
  fill: var(--red);
}

.page-about .plot-dots .is-blue {
  fill: var(--blue);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(36px, 6vw, 64px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats > li {
  background: var(--surface);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

@media (min-width: 820px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-about .about-stats > li:nth-child(even) .stat-num {
  color: var(--blue);
}

.page-about .stat-key {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .stat-desc {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-mute);
}

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding-block: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-head__lede {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 38em;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .timeline-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .timeline-rail {
    position: sticky;
    top: 104px;
  }
}

.page-about .timeline-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.page-about .timeline-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

@media (min-width: 900px) {
  .page-about .timeline-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
}

.page-about .rail-link {
  display: block;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--text-mute);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--red-dark);
  background: rgba(232, 51, 42, 0.08);
  border-left-color: var(--red);
}

.page-about .timeline-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 32px;
  position: relative;
}

.page-about .timeline-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 1px;
  background: linear-gradient(180deg, var(--red) 0%, var(--red-dark) 45%, var(--blue) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 44px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--blue);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:target::before {
  background: var(--red);
  border-color: var(--red);
}

.page-about .tl-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red-dark);
}

.page-about .tl-item h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .tl-item p {
  margin: 0;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 38em;
}

.page-about .tl-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .tl-tags li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--text-mute);
  background: var(--surface);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
}

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

.page-about .about-figure--wide {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--studio {
  aspect-ratio: 11 / 7;
}

.page-about .about-figure--desk {
  aspect-ratio: 3 / 2;
}

.page-about .timeline-figure {
  margin-top: clamp(32px, 5vw, 52px);
}

/* ---------- 四类栏目 ---------- */
.page-about .cols-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .page-about .cols-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .cols-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .col-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 22px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--sh-card);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .col-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--red);
}

.page-about .col-card--blue::after {
  background: var(--blue);
}

.page-about .col-card:hover,
.page-about .col-card:focus-visible {
  border-color: var(--red);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(13, 17, 23, 0.08);
}

.page-about .col-card--blue:hover,
.page-about .col-card--blue:focus-visible {
  border-color: var(--blue);
}

.page-about .col-card__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-about .col-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .col-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .col-card__meta {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--text-mute);
}

.page-about .col-card__go {
  font-size: 13px;
  font-weight: 700;
  color: var(--red-dark);
}

.page-about .col-card--blue .col-card__go {
  color: var(--blue);
}

/* ---------- 采集与发布 ---------- */
.page-about .flow-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: center;
}

@media (min-width: 980px) {
  .page-about .flow-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
}

.page-about .flow-step__n {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue);
  padding-top: 3px;
}

.page-about .flow-step h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 岗位分工 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

@media (min-width: 980px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

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

.page-about .role {
  background: var(--surface);
  padding: 18px 20px;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
}

.page-about .role__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.page-about .role__name {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .role__text {
  margin: 0;
  grid-column: 2 / -1;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 使用场景 ---------- */
.page-about .scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

@media (min-width: 880px) {
  .page-about .scene-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 28px;
    padding-bottom: 32px;
  }

  .page-about .scene:nth-child(even) {
    transform: translateY(32px);
  }
}

.page-about .scene {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--red);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
  box-shadow: var(--sh-card);
}

.page-about .scene:nth-child(even) {
  border-top-color: var(--blue);
}

.page-about .scene__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-about .scene h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .scene p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-soft);
}

.page-about .scenes-more {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .inline-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--red-dark);
  text-decoration: none;
  border-bottom: 1px solid rgba(192, 24, 31, 0.35);
  padding-bottom: 2px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

/* ---------- 合作与授权 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--on-dark);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 56px);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red) 0 50%, var(--blue) 50% 100%);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  color: #fff;
}

.page-about .about-cta > p {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--on-dark-mute);
}

.page-about .paths {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 860px) {
  .page-about .paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .path {
  border: 1px solid rgba(231, 236, 245, 0.16);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  padding: 20px 18px 22px;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .path:hover {
  border-color: rgba(182, 240, 58, 0.45);
  background: rgba(255, 255, 255, 0.06);
}

.page-about .path h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
}

.page-about .path p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--on-dark-mute);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 32px;
}

.page-about .about-cta__link {
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 240, 58, 0.4);
  padding-bottom: 2px;
  transition: border-color 0.18s var(--ease);
}

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

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 420px) {
  .page-about .timeline-track {
    padding-left: 24px;
  }

  .page-about .timeline-track::before {
    left: 6px;
  }

  .page-about .tl-item::before {
    left: -25px;
    width: 10px;
    height: 10px;
  }

  .page-about .role {
    grid-template-columns: 44px minmax(0, 1fr);
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .col-card,
  .page-about .tl-item::before,
  .page-about .rail-link,
  .page-about .inline-link,
  .page-about .about-cta__link,
  .page-about .path {
    transition: none;
  }

  .page-about .scene:nth-child(even) {
    transform: none;
  }
}