.page-about {
  --about-glow: rgba(53, 240, 208, 0.18);
  --about-year: 60px;
}

/* ============ 通用区块头 ============ */
.page-about .about-section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-section__title {
  font-size: clamp(26px, 5.2vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 12px 0 16px;
}

.page-about .about-section__intro {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  margin: 0;
}

.page-about .about-inline-link {
  margin-top: 28px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.35);
  padding-bottom: 1px;
}

.page-about .about-inline-link a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding-top: 40px;
  padding-bottom: 56px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -80px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-glow), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.page-about .about-hero__title {
  font-size: clamp(32px, 7.4vw, 68px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--white);
  margin: 16px 0 24px;
}

.page-about .about-hero__br {
  display: none;
}

.page-about .about-hero__lead {
  max-width: 660px;
  margin: 0 0 36px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  background: var(--panel);
  padding: 18px 20px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-hero__facts .data-num {
  font-size: 30px;
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-hero__fact-label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ============ 时间线 ============ */
.page-about .timeline {
  position: relative;
  padding-left: 34px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(180deg, var(--line), var(--line) 70%, transparent);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: 48px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 14px rgba(53, 240, 208, 0.55);
}

.page-about .timeline-item__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 200;
  font-size: var(--about-year);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--cyan);
  opacity: 0.9;
  margin-bottom: 10px;
}

.page-about .timeline-item__title {
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 10px;
  letter-spacing: 0.01em;
}

.page-about .timeline-item__body p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
  max-width: 46ch;
}

/* ============ 方法 ============ */
.page-about .method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 36px;
}

.page-about .method-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px 22px 28px;
  position: relative;
  overflow: hidden;
}

.page-about .method-card::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: 0.7;
}

.page-about .method-card__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 16px;
}

.page-about .method-card__num .data-num {
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .method-card__unit {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.1em;
}

.page-about .method-card__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .method-card__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .method-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.page-about .method-details {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px 22px;
}

.page-about .method-details summary {
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .method-details summary::-webkit-details-marker {
  display: none;
}

.page-about .method-details summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
  flex: none;
}

.page-about .method-details[open] summary::after {
  content: "－";
}

.page-about .method-details[open] summary {
  margin-bottom: 18px;
}

.page-about .method-steps {
  margin: 0;
  padding: 0 0 0 20px;
  list-style: decimal;
}

.page-about .method-steps li {
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.78;
  margin-bottom: 12px;
}

.page-about .method-steps li:last-child {
  margin-bottom: 0;
}

.page-about .method-steps strong {
  color: var(--white);
  font-weight: 700;
  margin-right: 4px;
}

.page-about .method-media {
  border-radius: var(--r-lg);
}

/* ============ 团队 ============ */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .team-media {
  border-radius: var(--r-lg);
}

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

.page-about .team-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px 22px;
  transition: border-color 200ms ease, transform 200ms ease;
}

.page-about .team-card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .team-card__city {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .team-card__role {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ============ 栏目 ============ */
.page-about .column-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .column-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .column-item__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.01em;
}

.page-about .column-item__freq {
  justify-self: end;
}

.page-about .column-item__text {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
  max-width: 62ch;
}

/* ============ 陕西 ============ */
.page-about .shaanxi-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .shaanxi-media {
  border-radius: var(--r-lg);
}

.page-about .shaanxi-body__lede {
  font-size: 16px;
  line-height: 1.8;
  color: var(--white);
  margin: 0 0 26px;
  max-width: 52ch;
}

.page-about .shaanxi-stats {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .shaanxi-stat {
  background: var(--panel-2);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
}

.page-about .shaanxi-stat__num {
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  flex: none;
  min-width: 52px;
}

.page-about .shaanxi-stat__label {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .shaanxi-body__note {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
}

/* ============ 认可 ============ */
.page-about .partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 34px;
}

.page-about .partner-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px 20px 22px;
}

.page-about .partner-card__label {
  display: inline-block;
  margin: 0 0 12px;
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .credential-band {
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-sm);
  background: var(--panel-2);
  padding: 22px 22px;
}

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

.page-about .credential-list li {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .credential-list .data-num {
  font-family: var(--font-mono);
  color: var(--amber);
  font-weight: 600;
  margin-right: 10px;
  letter-spacing: 0.02em;
}

/* ============ 主张对照 ============ */
.page-about .claims {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .claim-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .claim-row__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--orange);
  margin: 0 0 8px;
}

.page-about .claim-row__title h3 {
  font-size: 21px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0;
}

.page-about .claim-row__do p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 56ch;
}

/* ============ 结语 ============ */
.page-about .talk-panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 32px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  overflow: hidden;
}

.page-about .talk-panel::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-glow), transparent 70%);
  pointer-events: none;
}

.page-about .talk-panel__copy {
  position: relative;
  z-index: 1;
}

.page-about .talk-panel__title {
  font-size: clamp(24px, 4.6vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 12px 0 14px;
}

.page-about .talk-panel__copy .lead {
  margin: 0;
  max-width: 56ch;
}

.page-about .talk-panel__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .talk-panel__actions .btn {
  text-decoration: none;
}

/* ============ 响应式 ============ */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .shaanxi-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

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

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

@media (min-width: 860px) {
  .page-about {
    --about-year: 132px;
  }

  .page-about .about-hero {
    padding-top: 56px;
    padding-bottom: 72px;
  }

  .page-about .about-hero__br {
    display: inline;
  }

  .page-about .timeline {
    padding-left: 56px;
  }

  .page-about .timeline::before {
    left: 6px;
    top: 34px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
    padding-bottom: 56px;
  }

  .page-about .timeline-item::before {
    left: -56px;
    top: 42px;
    width: 13px;
    height: 13px;
  }

  .page-about .timeline-item__year {
    margin-bottom: 0;
    text-align: left;
  }

  .page-about .timeline-item__title {
    margin-top: 6px;
  }

  .page-about .method-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .method-details {
    padding: 26px 28px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .team-media {
    margin-top: 12px;
  }

  .page-about .shaanxi-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: 36px;
  }

  .page-about .partners-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }

  .page-about .credential-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 32px;
  }

  .page-about .claim-row {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
    padding: 34px 0;
  }

  .page-about .talk-panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 40px;
    padding: 44px 48px;
  }

  .page-about .talk-panel__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}