.page-about {
  --about-rule: rgba(212, 162, 76, 0.34);
  --about-rule-soft: rgba(232, 213, 176, 0.16);
  --about-sand-band: #EDE7DB;
  --about-tl-col: 54px;
  --about-tl-gap: 20px;
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-cn);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 88px 0 56px;
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(212, 162, 76, 0.18), transparent 62%),
    var(--ink);
}

.page-about .about-crumbs {
  margin-bottom: 26px;
}

.page-about .about-frame {
  position: relative;
  padding: 34px 20px 30px;
  border: 2px solid var(--gold);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(180deg, rgba(16, 42, 67, 0.72), rgba(11, 27, 43, 0.18));
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  height: 10px;
  background: repeating-linear-gradient(90deg, var(--gold) 0 2px, transparent 2px 24px);
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-frame::before { top: -10px; }
.page-about .about-frame::after { bottom: -10px; }

.page-about .about-hero-title {
  margin: 16px 0 0;
  font-size: clamp(30px, 7.2vw, 52px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .about-hero-lead {
  max-width: 58ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.74);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 28px;
  border: 1px solid var(--about-rule);
  background: var(--about-rule);
}

.page-about .hero-stat {
  background: var(--ink);
  padding: 16px 18px;
}

.page-about .hero-stat-num {
  display: block;
  font-family: var(--font-num);
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold-bright);
}

.page-about .hero-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--sand);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  padding: 56px 0;
  border-top: 1px solid rgba(232, 213, 176, 0.08);
}

.page-about .sec-head {
  max-width: 74ch;
  margin-bottom: 34px;
}

.page-about .sec-kicker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .sec-num {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--gold);
}

.page-about .sec-label {
  color: var(--sand);
  font-family: var(--font-cn);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .sec-lead {
  max-width: 64ch;
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.72);
}

.page-about [data-reveal] {
  opacity: 0.82;
  transition: opacity 0.4s var(--ease);
}

.page-about [data-reveal].is-in {
  opacity: 1;
}

/* ---------- 01 沿革时间轴 ---------- */

.page-about .history-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .history-figure {
  margin: 0;
  border: 2px solid var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--night);
}

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

.page-about .history-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--sand);
  border-top: 1px solid var(--about-rule);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: calc(var(--about-tl-col) + (var(--about-tl-gap) / 2) - 1px);
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(212, 162, 76, 0.12));
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-tl-col) minmax(0, 1fr);
  gap: var(--about-tl-gap);
  padding-bottom: 22px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 13px;
  left: calc(var(--about-tl-col) + (var(--about-tl-gap) / 2) - 7px);
  width: 10px;
  height: 10px;
  border: 2px solid var(--gold);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .tl-year {
  padding-top: 6px;
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.04em;
  text-align: right;
  color: var(--gold);
}

.page-about .tl-card {
  padding: 16px 18px;
  border: 2px solid var(--about-rule-soft);
  background: var(--night);
  transition: border-color 0.16s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus,
.page-about .tl-card:focus-within {
  border-color: var(--gold);
  box-shadow: 6px 6px 0 var(--black);
  transform: translate(-2px, -2px);
  outline: none;
}

.page-about .tl-title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .tl-desc {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.7);
}

.page-about .tl-extra {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-rule);
  font-size: 14px;
  line-height: 1.7;
  color: var(--sand);
}

/* ---------- 02 校对机制 ---------- */

.page-about .about-sec--review {
  background:
    radial-gradient(90% 60% at 0% 0%, rgba(92, 113, 94, 0.16), transparent 58%),
    var(--ink);
}

.page-about .review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .review-figure {
  margin: 0;
  border: 2px solid var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--night);
}

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

.page-about .review-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--sand);
  border-top: 1px solid var(--about-rule);
}

.page-about .review-steps {
  display: grid;
  gap: 16px;
}

.page-about .review-step {
  position: relative;
  padding: 20px 20px 22px;
  border: 2px solid var(--about-rule-soft);
  border-left: 6px solid var(--moss);
  background: rgba(16, 42, 67, 0.65);
  transition: border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .review-step:nth-child(2) { border-left-color: var(--gold); }
.page-about .review-step:nth-child(3) { border-left-color: var(--glaze); }

.page-about .review-step:hover,
.page-about .review-step:focus-within {
  border-color: var(--gold);
  background: rgba(16, 42, 67, 0.95);
}

.page-about .review-step-num {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold-bright);
}

.page-about .review-step-title {
  margin: 6px 0 0;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .review-step-text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .review-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .review-tag {
  padding: 8px 16px;
  border: 2px solid var(--gold);
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-bright);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .review-tag:hover {
  background: var(--gold);
  color: var(--black);
}

/* ---------- 03 覆盖数据带 ---------- */

.page-about .band-sand {
  padding: 56px 0 60px;
  background: var(--about-sand-band);
  color: var(--ink);
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}

.page-about .sec-head--dark .sec-kicker,
.page-about .sec-kicker--dark {
  color: var(--glaze);
}

.page-about .sec-head--dark .sec-num {
  color: var(--glaze);
}

.page-about .sec-head--dark .sec-label {
  color: #4A4136;
}

.page-about .sec-head--dark .sec-title {
  color: var(--ink);
}

.page-about .sec-lead--dark {
  color: #3C3A34;
}

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .coverage-figure {
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: 8px 8px 0 var(--ink);
  background: #DCD5C6;
}

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

.page-about .coverage-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #3C3A34;
  border-top: 2px solid var(--ink);
}

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

.page-about .cov-item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border: 2px solid var(--ink);
  background: #F8F5EE;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .cov-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.page-about .cov-dot {
  width: 14px;
  height: 14px;
  margin-top: 5px;
  border: 2px solid var(--ink);
  border-radius: 50%;
}

.page-about .cov-dot--moss { background: var(--moss); }
.page-about .cov-dot--gold { background: var(--gold); }
.page-about .cov-dot--glaze { background: var(--glaze); }
.page-about .cov-dot--stone { background: var(--stone); }

.page-about .cov-body {
  display: grid;
  gap: 6px;
}

.page-about .cov-label {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: #5A5044;
}

.page-about .cov-value {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 04 新用户路径 ---------- */

.page-about .about-sec--path {
  background:
    radial-gradient(80% 70% at 100% 100%, rgba(212, 162, 76, 0.14), transparent 60%),
    var(--ink);
}

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

.page-about .path-step {
  position: relative;
  padding: 22px 20px 24px;
  border: 2px solid var(--about-rule-soft);
  background: linear-gradient(160deg, rgba(16, 42, 67, 0.92), rgba(11, 27, 43, 0.96));
  transition: border-color 0.16s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .path-step:hover,
.page-about .path-step:focus-within {
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: 6px 6px 0 var(--black);
}

.page-about .path-num {
  display: block;
  font-family: var(--font-num);
  font-size: 42px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .path-title {
  margin: 12px 0 0;
  font-size: 20px;
  font-weight: 800;
  color: var(--cream);
}

.page-about .path-text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .path-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

/* ---------- 05 合作生态 ---------- */

.page-about .about-sec--eco {
  border-top: 1px solid rgba(232, 213, 176, 0.08);
}

.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .eco-note {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--moss);
  font-size: 15px;
  line-height: 1.8;
  color: var(--sand);
}

.page-about .eco-copy .btn {
  margin-top: 26px;
}

.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 2px solid var(--about-rule);
  background: var(--about-rule);
}

.page-about .eco-stat {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 20px 16px;
  background: var(--ink);
}

.page-about .eco-num {
  font-family: var(--font-num);
  font-size: 38px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold-bright);
}

.page-about .eco-label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--sand);
}

/* ---------- 结尾行动 ---------- */

.page-about .about-cta {
  padding: 52px 0 68px;
  background: var(--night);
  border-top: 2px solid var(--gold);
}

.page-about .cta-inner {
  max-width: 74ch;
  padding: 30px 22px 32px;
  border: 2px solid var(--gold);
  box-shadow: var(--shadow-hard);
  background: var(--ink);
}

.page-about .cta-title {
  margin: 0;
  font-size: clamp(24px, 4.2vw, 34px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .cta-text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */

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

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

@media (min-width: 900px) {
  .page-about {
    --about-tl-col: 92px;
    --about-tl-gap: 28px;
  }

  .page-about .about-hero {
    padding: 64px 0 76px;
  }

  .page-about .about-frame {
    padding: 46px 44px 42px;
  }

  .page-about .about-hero-title {
    font-size: clamp(42px, 5vw, 68px);
  }

  .page-about .about-sec {
    padding: 96px 0;
  }

  .page-about .sec-head {
    margin-bottom: 46px;
  }

  .page-about .history-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .history-figure {
    position: sticky;
    top: 32px;
  }

  .page-about .tl-item {
    padding-bottom: 26px;
  }

  .page-about .tl-extra {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top: 1px dashed transparent;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease), opacity 0.24s var(--ease),
      margin-top 0.3s var(--ease), padding-top 0.3s var(--ease);
  }

  .page-about .tl-item:hover .tl-extra,
  .page-about .tl-item:focus-within .tl-extra,
  .page-about .tl-card:focus + .tl-extra {
    max-height: 220px;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--about-rule);
    opacity: 1;
  }

  .page-about .review-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .review-figure {
    position: sticky;
    top: 32px;
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .path-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }

  .page-about .path-step:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .path-step:nth-child(3) {
    margin-top: 64px;
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: start;
  }

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

  .page-about .eco-stat {
    padding: 26px 20px;
  }

  .page-about .cta-inner {
    padding: 44px 44px 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .tl-card,
  .page-about .tl-extra,
  .page-about .cov-item,
  .page-about .path-step,
  .page-about .review-step,
  .page-about .review-tag {
    transition: none;
  }

  .page-about [data-reveal] {
    opacity: 1;
  }

  .page-about .tl-card:hover,
  .page-about .tl-card:focus,
  .page-about .tl-card:focus-within,
  .page-about .cov-item:hover,
  .page-about .path-step:hover,
  .page-about .path-step:focus-within {
    transform: none;
  }
}