.page-about {
  --about-side-w: 190px;
}

/* ---------- 首屏 ---------- */
.page-about .about-open {
  padding-top: 4px;
}

.page-about .about-open-grid {
  display: grid;
  gap: 26px;
  margin-top: 18px;
}

@media (min-width: 900px) {
  .page-about .about-open-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
}

.page-about .about-open-lead h1 {
  margin: 10px 0 18px;
}

.page-about .about-open-lead .lead {
  max-width: 62ch;
}

.page-about .about-open-note {
  position: relative;
  padding: 22px 20px 20px;
  border: 1.5px solid var(--c-fog);
  border-top: 4px solid var(--c-red);
  background: #fff;
  box-shadow: var(--shadow-card);
}

.page-about .about-open-note p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-open-note .btn-row {
  margin-top: 18px;
}

.page-about .about-index {
  list-style: none;
  margin: 36px 0 0;
  padding: 18px 0 0;
  border-top: 1.5px solid var(--c-fog);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 3px;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1.5px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-index a:hover {
  color: var(--c-red);
  border-color: var(--c-red);
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-red);
}

/* ---------- 通用区块骨架：左展签 + 右正文 ---------- */
.page-about .about-block {
  display: grid;
  gap: 20px;
}

@media (min-width: 900px) {
  .page-about .about-block {
    grid-template-columns: var(--about-side-w) minmax(0, 1fr);
    gap: 56px;
  }
}

.page-about .about-side {
  padding-top: 12px;
  border-top: 3px solid var(--c-red);
}

@media (min-width: 900px) {
  .page-about .about-side {
    position: sticky;
    top: 92px;
    align-self: start;
  }
}

.page-about .about-side-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--c-red);
}

.page-about .about-side-title {
  margin: 8px 0 0;
  font-size: 20px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-main > p {
  margin: 0 0 1.1em;
  max-width: 68ch;
}

.page-about .about-intro {
  font-size: 17px;
  line-height: 1.75;
}

/* ---------- 统计条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5px;
  margin: 32px 0 0;
  border: 1.5px solid var(--c-fog);
  background: var(--c-fog);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--c-paper);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-navy);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ---------- 团队三条线 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 16px;
  margin: 26px 0 36px;
}

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

.page-about .about-role {
  position: relative;
  padding: 24px 20px 22px;
}

.page-about .about-role .card-title {
  margin: 8px 0 10px;
  font-size: 17px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-role-num {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-red);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 深色档案区 ---------- */
.page-about .section--dark {
  color: var(--c-paper);
}

.page-about .section--dark .about-side {
  border-top-color: var(--c-orange);
}

.page-about .section--dark .about-side-num {
  color: var(--c-orange);
}

.page-about .section--dark .about-main p {
  color: rgba(247, 244, 238, 0.82);
}

.page-about .about-track {
  list-style: none;
  display: flex;
  gap: 14px;
  margin: 30px 0 34px;
  padding: 0 0 18px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-node {
  position: relative;
  flex: 0 0 auto;
  width: 150px;
  padding: 22px 0 0;
  border-top: 1.5px solid rgba(247, 244, 238, 0.22);
  scroll-snap-align: start;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-teal);
}

.page-about .about-node:last-child::before {
  background: var(--c-orange);
}

.page-about .about-node-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-teal);
}

.page-about .about-node:last-child .about-node-label {
  color: var(--c-orange);
}

.page-about .about-node p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(247, 244, 238, 0.78);
}

.page-about .about-archive-figure {
  margin-top: 4px;
}

/* ---------- 覆盖网络 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

@media (min-width: 780px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
    align-items: start;
  }
}

.page-about .about-coverage-facts {
  display: block;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1.5px solid var(--c-fog);
}

.page-about .about-fact:first-child {
  border-top: 1.5px solid var(--c-fog);
}

.page-about .about-fact-num {
  flex: 0 0 auto;
  min-width: 68px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-grass);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-coverage-note {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  margin-top: 30px;
  border-left: 1.5px solid var(--c-fog);
}

.page-about .about-cadence-item {
  position: relative;
  padding: 0 0 30px 28px;
}

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

.page-about .about-cadence-item::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -5.5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-red);
}

.page-about .about-cadence-item:nth-child(2)::before {
  background: var(--c-orange);
}

.page-about .about-cadence-item:nth-child(3)::before {
  background: var(--c-teal);
}

.page-about .about-cadence-item h3 {
  margin: 12px 0 8px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .about-cadence-item p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-coop {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

@media (min-width: 660px) {
  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-coop-item {
  padding: 22px 20px;
  border: 1.5px solid var(--c-fog);
  border-top: 3px solid var(--c-teal);
  background: #fff;
  transition: transform var(--t-base), box-shadow var(--t-base);
}

.page-about .about-coop-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.page-about .about-coop-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-teal);
  font-variant-numeric: tabular-nums;
}

.page-about .about-coop-item h3 {
  margin: 10px 0 10px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .about-coop-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-award {
  position: relative;
  margin-top: 22px;
  padding: 26px 24px 24px;
  border: 1.5px solid var(--c-navy);
  background: var(--c-paper);
  box-shadow: var(--shadow-card);
}

.page-about .about-award h3 {
  margin: 16px 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-award p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 联系与反馈 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

@media (min-width: 720px) {
  .page-about .about-reach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-reach-card {
  padding: 22px 20px;
  border: 1.5px solid var(--c-fog);
  border-left: 4px solid var(--c-red);
  background: #fff;
}

.page-about .about-reach-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .about-reach-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-reach-card a {
  color: var(--c-red);
  text-decoration: none;
  border-bottom: 1.5px solid rgba(226, 56, 44, 0.35);
}

.page-about .about-reach-card a:hover {
  border-bottom-color: var(--c-red);
}

.page-about .about-contact {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1.5px solid var(--c-fog);
}

.page-about .about-contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  padding: 14px 0;
  border-bottom: 1.5px solid var(--c-fog);
}

.page-about .about-contact-key {
  flex: 0 0 auto;
  min-width: 92px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.page-about .about-contact-val {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-reach-note {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-coop-item {
    transition: opacity var(--t-fast);
  }
  .page-about .about-coop-item:hover {
    transform: none;
  }
}