.page-about {
  --about-cut: 20px;
  color: var(--chalk);
  font-family: var(--font-body);
}

.page-about .breadcrumb {
  padding: 18px 0 4px;
  font-size: 13px;
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(10px, 2vw, 22px);
  overflow: hidden;
}

.page-about .about-hero-copy {
  display: grid;
  gap: 16px;
  padding-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(32px, 7.2vw, 68px);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .about-lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(242, 247, 245, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 4px;
}

.page-about .about-hero-figure {
  margin: 0;
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-top: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 18, 15, 0.15) 0%, rgba(7, 18, 15, 0.72) 100%);
  pointer-events: none;
}

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

/* ---------- 通用正文 ---------- */
.page-about .about-p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(242, 247, 245, 0.84);
}

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

.page-about .about-h2 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(25px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--chalk);
  max-width: 20em;
}

.page-about .about-section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 40px);
  max-width: 46em;
}

.page-about .about-section-lede {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: rgba(242, 247, 245, 0.78);
}

/* ---------- 为什么 ---------- */
.page-about .about-why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

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

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

.page-about .about-nav a {
  display: block;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--steel);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-nav a:hover {
  color: var(--chalk);
  border-color: var(--steel);
  background: var(--surface);
}

.page-about .about-nav a[data-active="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-reason {
  margin-top: 22px;
  padding: 20px 20px 20px 22px;
  border-left: 2px solid var(--lime);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-reason-label {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-reason-text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--chalk);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--steel) 0%, var(--line) 55%, rgba(30, 51, 44, 0) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) 34px;
}

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

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--steel);
  transition: transform 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:target .tl-dot {
  transform: scale(1.4);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .tl-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .tl-title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.35;
  color: var(--lime);
}

.page-about .tl-item:target .tl-title {
  color: var(--amber);
}

.page-about .tl-text {
  margin: 0;
  max-width: 38em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(242, 247, 245, 0.78);
}

.page-about .tl-item .tag {
  margin-top: 10px;
  display: inline-block;
}

/* ---------- 统计条 ---------- */
.page-about .about-stats {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(105deg, var(--ink-2) 0%, var(--night) 72%, var(--ink-2) 100%);
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-stat {
  padding: clamp(22px, 3.4vw, 34px) 4px;
}

.page-about .about-stat + .about-stat {
  border-top: 1px solid var(--line);
}

.page-about .stat-num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1;
  color: var(--chalk);
}

.page-about .stat-unit {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: clamp(12px, 1.4vw, 14px);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .stat-label {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 跟队三件事 ---------- */
.page-about .follow-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .follow-card {
  position: relative;
  padding: 22px 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .follow-step {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .follow-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.3;
  color: var(--chalk);
}

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

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

.page-about .about-follow-figure img {
  aspect-ratio: 16 / 9;
}

/* ---------- 数据台 ---------- */
.page-about .data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .data-steps {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .data-steps li {
  padding-left: 16px;
  border-left: 1px solid var(--night-line);
}

.page-about .data-step-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .about-data-figure {
  margin: 0;
}

.page-about .about-data-figure img {
  aspect-ratio: 9 / 7;
  border: 1px solid var(--night-line);
}

.page-about .media-caption {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 双列说明 ---------- */
.page-about .about-two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.5vw, 44px);
}

.page-about .two-col-side {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .coverage-card {
  padding: 18px 18px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--amber);
}

.page-about .coverage-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .coverage-card .about-p {
  font-size: 0.94rem;
  margin: 0;
}

.page-about .editorial-side {
  gap: 14px;
}

.page-about .editorial-note {
  padding: 18px;
  background: var(--night);
  border: 1px solid var(--night-line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .editorial-note-label {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .editorial-note-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(242, 247, 245, 0.82);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(34px, 5vw, 64px) 0 clamp(44px, 6vw, 80px);
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-next-link {
  display: grid;
  gap: 6px;
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-next-link:hover {
  border-color: var(--lime);
  background: var(--ink-2);
  transform: translateY(-2px);
}

.page-about .about-next-link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-next-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-next-text {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  letter-spacing: 0.02em;
  color: var(--chalk);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero-figure {
    aspect-ratio: 16 / 6.8;
  }

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

  .page-about .about-stat {
    padding-left: 24px;
    padding-right: 24px;
  }

  .page-about .about-stat:first-child {
    padding-left: 0;
  }

  .page-about .about-stat + .about-stat {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

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

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

@media (min-width: 900px) {
  .page-about .about-why-grid {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-about .about-nav ul {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-nav a {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 8px 0 8px 14px;
    font-size: 13.5px;
    letter-spacing: 0.04em;
    transition: color 0.18s var(--ease), border-left-color 0.18s var(--ease);
  }

  .page-about .about-nav a:hover {
    background: transparent;
    border-left-color: var(--steel);
  }

  .page-about .about-nav a[data-active="true"] {
    color: var(--lime);
    background: transparent;
    border-left: 2px solid var(--lime);
    padding-left: 13px;
  }

  .page-about .data-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: start;
  }

  .page-about .about-two-col {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-two-col--reverse .two-col-main {
    order: 2;
  }

  .page-about .about-two-col--reverse .two-col-side {
    order: 1;
  }
}

@media (min-width: 1100px) {
  .page-about .tl {
    max-width: 900px;
  }

  .page-about .about-follow-figure img {
    aspect-ratio: 16 / 7;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-dot,
  .page-about .about-next-link,
  .page-about .about-nav a {
    transition: none;
  }

  .page-about .about-next-link:hover {
    transform: none;
  }
}