.page-about {
  --about-rail-w: 208px;
  --about-radius: 22px;
}

/* ===== 首屏：左叙事 / 右数据面板 ===== */
.page-about .about-hero {
  padding: 24px 0 40px;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-hero-main .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero-main h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: 32px;
  line-height: 1.18;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .01em;
}

.page-about .about-hero-main .lede {
  margin: 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 16px;
  padding: 26px 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, var(--ink) 0%, var(--ink-2) 58%, var(--ink-3) 100%);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero-stats::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 196, 140, .38), transparent 70%);
  z-index: -1;
}

.page-about .about-stat {
  position: relative;
  padding-left: 14px;
  border-left: 2px solid rgba(255, 176, 32, .7);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: .13em;
  color: rgba(255, 255, 255, .7);
}

/* ===== 主体：档案书脊 + 叙事长栏 ===== */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

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

.page-about .about-body {
  min-width: 0;
}

.page-about .about-section {
  padding: 38px 0 10px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

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

.page-about .about-section .eyebrow {
  margin-bottom: 12px;
}

.page-about .about-section .section-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.28;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-section .lede {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-section .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

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

/* ===== 五道工序 ===== */
.page-about .about-process-figure {
  margin: 24px 0 8px;
}

.page-about .about-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-step {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  overflow: hidden;
  transition: border-color .16s ease, box-shadow .16s ease;
}

.page-about .about-step[open] {
  border-color: var(--ink-2);
  box-shadow: var(--shadow-card);
}

.page-about .about-step > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 4px 10px;
  border-radius: var(--pill);
  background: var(--ink);
  color: var(--paper);
  transition: background-color .16s ease, color .16s ease;
}

.page-about .about-step[open] .about-step-num {
  background: var(--green);
  color: var(--ink);
}

.page-about .about-step-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-step-days {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-step-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--silver);
}

.page-about .about-step-body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-step-out {
  margin-top: 14px !important;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--green-soft);
  color: var(--green-deep) !important;
  font-size: 14px !important;
  font-weight: 600;
}

/* ===== 内容谱系 ===== */
.page-about .about-views-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-view-card {
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  background: var(--silver);
  border-left: 4px solid var(--green);
}

.page-about .about-view-card:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .about-view-card:nth-child(3) {
  border-left-color: var(--ink-3);
}

.page-about .about-view-card:nth-child(4) {
  border-left-color: var(--rust);
}

.page-about .about-view-era {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  border-radius: var(--pill);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.page-about .about-view-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-view-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ===== 版本年表 ===== */
.page-about .about-version-figure {
  margin: 22px 0 30px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 2px solid var(--line);
}

.page-about .about-timeline .timeline-item {
  position: relative;
  padding: 0 0 4px;
}

.page-about .about-timeline .timeline-dot {
  position: absolute;
  left: -35px;
  top: 17px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--line);
  box-sizing: content-box;
}

.page-about .about-timeline .timeline-item.is-current .timeline-dot {
  background: var(--amber);
  border-color: var(--ink);
}

.page-about .about-era > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 13px 0 11px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-era-year {
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  background: var(--silver);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .03em;
  transition: background-color .16s ease;
}

.page-about .about-timeline .timeline-item.is-current .about-era-year {
  background: var(--amber);
}

.page-about .about-era-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-era p {
  margin: 0 0 14px;
  padding-right: 6px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ===== 回访机制 ===== */
.page-about .about-revisit-panel {
  margin-top: 24px;
  padding: 24px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
}

.page-about .about-revisit-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--ink);
}

.page-about .about-revisit-total {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-revisit-total-label {
  font-size: 14px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .about-revisit-points {
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-revisit-points > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--silver);
}

.page-about .about-revisit-points dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-revisit-points dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-range {
  margin-top: 24px;
}

.page-about .about-range-scale {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.page-about .about-range-scale .mono {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-range-mid {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-range-bar {
  height: 12px;
  border-radius: var(--pill);
  background: var(--silver);
  overflow: hidden;
}

.page-about .about-range-fill {
  display: block;
  height: 100%;
  width: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--amber) 0%, var(--green) 100%);
}

.page-about .about-range-note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ===== 团队与节奏 ===== */
.page-about .about-team {
  position: relative;
  margin-top: 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  isolation: isolate;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-team-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .32;
  z-index: -1;
}

.page-about .about-team-inner {
  padding: 32px 22px 36px;
  background: linear-gradient(180deg, rgba(11, 31, 58, .58) 0%, rgba(11, 31, 58, .95) 68%);
}

.page-about .about-team .eyebrow {
  color: var(--amber);
  margin-bottom: 12px;
}

.page-about .about-team .section-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.28;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-team-role {
  padding: 16px 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(200, 211, 224, .22);
}

.page-about .about-team-role b {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-team-role span {
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-team-notes {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(200, 211, 224, .22);
}

.page-about .about-team-notes p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .74);
}

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

/* ===== 长期回查 ===== */
.page-about .about-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-link-card {
  display: block;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  text-decoration: none;
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}

.page-about .about-link-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink-2);
  box-shadow: var(--shadow-card);
}

.page-about .about-link-card strong {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-link-card span {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 34px 0 52px;
  }

  .page-about .about-hero-main h1 {
    font-size: 42px;
  }

  .page-about .about-section .section-title,
  .page-about .about-team .section-title {
    font-size: 28px;
  }

  .page-about .about-views-list {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-revisit-panel {
    padding: 28px 28px 30px;
  }

  .page-about .about-revisit-points {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-revisit-points > div {
    padding: 14px 18px 14px 0;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-team-inner {
    padding: 40px 34px 44px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .9fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero-main h1 {
    font-size: 50px;
  }

  .page-about .about-hero-stats {
    padding: 30px 26px;
  }

  .page-about .about-section {
    padding: 52px 0 14px;
  }

  .page-about .about-team {
    margin-top: 52px;
  }

  .page-about .about-team-inner {
    padding: 52px 46px 56px;
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    padding: 26px 20px 28px;
    border-radius: var(--radius-lg);
    background: var(--ink);
    color: var(--paper);
  }

  .page-about .about-rail-title {
    margin: 0 0 18px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .22em;
    color: var(--amber);
  }

  .page-about .about-rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
  }

  .page-about .about-rail-list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    line-height: 1.4;
    color: rgba(255, 255, 255, .78);
    text-decoration: none;
    transition: background-color .16s ease, color .16s ease;
  }

  .page-about .about-rail-list a:hover {
    background: var(--ink-2);
    color: var(--paper);
  }

  .page-about .about-rail-num {
    flex: 0 0 auto;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--amber);
  }

  .page-about .about-rail-foot {
    display: flex;
    justify-content: space-between;
    margin-top: 22px;
    padding-top: 16px;
    border-top: 1px solid rgba(200, 211, 224, .24);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .12em;
    color: rgba(255, 255, 255, .5);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-main h1 {
    font-size: 56px;
  }

  .page-about .about-section .section-title,
  .page-about .about-team .section-title {
    font-size: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-link-card,
  .page-about .about-step-num {
    transition: none;
  }

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