/* ===== 页面基底 ===== */
.page-about {
  display: block;
  background: var(--deep-field);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.page-about .about-crumb {
  padding-top: 18px;
}

.page-about .breadcrumb__link,
.page-about .breadcrumb__current {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ===== 首屏主题声明 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--hair);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(47, 224, 200, 0.1), transparent 58%),
    radial-gradient(80% 70% at 4% 108%, rgba(27, 107, 82, 0.26), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  padding: 28px 0 48px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-cyan);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 50ch;
  font-size: 16px;
  color: var(--ink);
}

.page-about .about-hero__facts {
  margin: 30px 0 0;
  border-top: var(--hair);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: var(--hair);
}

.page-about .about-hero__fact dt {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan-soft);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  border: var(--hair);
  filter: saturate(0.85) brightness(0.82);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 50, 55, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 50, 55, 0.5) 1px, transparent 1px);
  background-size: 56px 56px;
  mix-blend-mode: overlay;
}

/* ===== 统计条 ===== */
.page-about .about-stats {
  padding: 44px 0 0;
}

.page-about .stat-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hair);
  border-left: var(--hair);
}

.page-about .stat-strip__item {
  position: relative;
  padding: 20px 16px 22px;
  border-right: var(--hair);
  border-bottom: var(--hair);
  transition: background var(--t-fast) var(--ease);
}

.page-about .stat-strip__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 23px;
  font-weight: 500;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--signal-cyan);
}

.page-about .stat-strip__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .stat-strip__tip {
  display: block;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dotted var(--slate-line);
  font-size: 11px;
  line-height: 1.55;
  color: var(--muted);
}

/* ===== 页内索引 ===== */
.page-about .about-index {
  padding: 40px 0 4px;
}

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

.page-about .about-index__link {
  display: inline-block;
  padding: 7px 12px;
  border: var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--signal-cyan);
  border-color: var(--signal-cyan);
  background: rgba(47, 224, 200, 0.06);
}

/* ===== 展区骨架 ===== */
.page-about .exhibit {
  padding: 48px 0;
  border-top: var(--hair);
}

.page-about .exhibit--panel {
  background: var(--graphite);
}

.page-about .exhibit__grid {
  display: grid;
  gap: 28px;
}

.page-about .exhibit__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .exhibit__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal-cyan);
}

.page-about .exhibit__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .exhibit__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .exhibit__body > p {
  margin: 0 0 18px;
  max-width: 66ch;
  font-size: 15.5px;
  color: var(--ink);
}

.page-about .exhibit__body > p:last-child {
  margin-bottom: 0;
}

.page-about .exhibit__lead {
  font-size: 16.5px;
  font-weight: 500;
  color: var(--paper);
  max-width: 60ch;
}

.page-about .exhibit__body a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 243, 230, 0.35);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .exhibit__body a:hover,
.page-about .exhibit__body a:focus-visible {
  color: var(--signal-cyan);
  border-color: var(--signal-cyan);
}

/* ===== 三处麻烦 ===== */
.page-about .point-list {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--slate-line);
  border: var(--hair);
}

.page-about .point {
  background: var(--deep-field);
  padding: 22px 20px 24px;
}

.page-about .exhibit--panel .point {
  background: var(--graphite);
}

.page-about .point__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--signal-cyan);
}

.page-about .point__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .point__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink);
}

/* ===== 三条主线卡片 ===== */
.page-about .thread-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .thread {
  padding: 24px 22px 26px;
  border: var(--hair);
  background: var(--graphite);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .thread:hover,
.page-about .thread:focus-within {
  transform: translateY(-4px);
  border-color: var(--signal-cyan);
  box-shadow: 0 18px 40px -26px rgba(47, 224, 200, 0.6);
}

.page-about .thread__no {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal-cyan);
}

.page-about .thread__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .thread__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink);
}

.page-about .thread__facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--slate-line);
  display: grid;
  gap: 6px;
}

.page-about .thread__facts li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .thread__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 1px;
  background: var(--turf);
}

/* ===== 数据来源三条 ===== */
.page-about .source-list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--slate-line);
  border: var(--hair);
}

.page-about .source {
  background: var(--deep-field);
  padding: 18px 20px 20px;
}

.page-about .source__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--signal-cyan);
}

.page-about .source__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .source__desc {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

/* ===== 图文占位 ===== */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--hair);
  object-fit: cover;
  filter: saturate(0.82) brightness(0.85);
}

.page-about .about-figure__cap {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--turf);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 62ch;
}

/* ===== 对照维度 ===== */
.page-about .dim-list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--slate-line);
  border: var(--hair);
}

.page-about .dim {
  background: var(--deep-field);
  padding: 18px 16px 20px;
}

.page-about .dim__name {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .dim__desc {
  display: block;
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

/* ===== 岗位分工 ===== */
.page-about .role-list {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  border-top: 1px solid var(--slate-line);
}

.page-about .role {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--slate-line);
}

.page-about .role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan-soft);
}

.page-about .role__duty {
  font-size: 14.5px;
  color: var(--ink);
}

/* ===== 演进轴 ===== */
.page-about .stage-list {
  list-style: none;
  margin: 4px 0 26px;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .stage {
  position: relative;
  padding-left: 30px;
}

.page-about .stage__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal-cyan);
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--deep-field);
  border: 1px solid var(--turf);
}

.page-about .stage__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .stage__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink);
}

/* ===== 合作与产出 ===== */
.page-about .partner-grid {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--slate-line);
  border: var(--hair);
}

.page-about .partner-grid__item {
  background: var(--deep-field);
  padding: 22px 20px 24px;
}

.page-about .partner-grid__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 500;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--signal-cyan);
}

.page-about .partner-grid__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

.page-about .partner-grid__text {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
}

/* ===== 资质信息表 ===== */
.page-about .meta-table {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--slate-line);
}

.page-about .meta-table__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--slate-line);
}

.page-about .meta-table__key {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .meta-table__val {
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: var(--ink);
  word-break: break-word;
}

.page-about .meta-table__val--text {
  font-family: var(--font-body);
}

/* ===== 收束行动区 ===== */
.page-about .about-cta {
  margin-top: 30px;
  padding: 26px 22px;
  border: 1px solid var(--turf);
  background: linear-gradient(135deg, rgba(27, 107, 82, 0.26), rgba(20, 24, 27, 0.92) 62%);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
  max-width: 58ch;
}

.page-about .about-cta__text a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 243, 230, 0.35);
}

.page-about .about-cta__text a:hover,
.page-about .about-cta__text a:focus-visible {
  color: var(--signal-cyan);
  border-color: var(--signal-cyan);
}

.page-about .about-cta .btn {
  justify-self: start;
}

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

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

  .page-about .about-cta {
    padding: 30px 30px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: center;
    padding: 52px 0 76px;
  }

  .page-about .thread-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .dim-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-cta .btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .exhibit {
    padding: 80px 0;
  }

  .page-about .exhibit__grid {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    gap: 0 72px;
  }

  .page-about .exhibit__note {
    margin-top: 10px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.24em;
    max-height: 180px;
  }

  .page-about .exhibit__body > p {
    font-size: 16px;
  }

  .page-about .exhibit__lead {
    font-size: 17px;
  }

  .page-about .role {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

  .page-about .meta-table__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

  .page-about .stage-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
    padding-top: 8px;
    border-top: 1px solid var(--slate-line);
  }

  .page-about .stage {
    padding: 26px 0 0;
  }

  .page-about .stage::before {
    top: -8px;
    left: 0;
    width: 15px;
    height: 15px;
    background: var(--signal-cyan);
    border: 0;
    box-shadow: 0 0 0 4px var(--deep-field);
  }
}

@media (min-width: 1120px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .stat-strip__item:hover {
    background: rgba(47, 224, 200, 0.05);
  }

  .page-about .stat-strip__tip {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0;
    padding: 10px 14px;
    border: 1px solid var(--turf);
    background: var(--moss-line);
    color: var(--cyan-soft);
    opacity: 0;
    transform: translateY(100%);
    pointer-events: none;
    z-index: 6;
    transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  }

  .page-about .stat-strip__item:hover .stat-strip__tip,
  .page-about .stat-strip__item:focus-within .stat-strip__tip {
    opacity: 1;
    transform: translateY(0);
  }
}