.page-about {
  --about-gap: clamp(24px, 3.6vw, 52px);
  --about-sec-pad: clamp(46px, 6.4vw, 86px);
  color: var(--rock);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  overflow-x: clip;
  -webkit-text-size-adjust: 100%;
}

.page-about p { margin: 0 0 1em; }
.page-about a { color: var(--lake); }

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(16px, 2.2vw, 28px) 0 clamp(48px, 6.2vw, 82px);
  background:
    linear-gradient(180deg, #E9F2F4 0%, rgba(248, 245, 239, .72) 56%, var(--paper) 100%);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  opacity: .34;
  mix-blend-mode: luminosity;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb { margin: 0 0 clamp(18px, 2.6vw, 30px); }

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  color: var(--lake);
  margin: 0 0 16px;
}

.page-about .about-h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.14;
  letter-spacing: -.022em;
  color: var(--ink);
  margin: 0 0 clamp(24px, 3.2vw, 36px);
  text-wrap: balance;
}

/* 竖向阶段刻度 */
.page-about .stage-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .stage-rail::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lake) 0%, var(--amber) 62%, var(--orange) 100%);
}

.page-about .stage-rail-item {
  position: relative;
  padding: 0 0 20px 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
}

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

.page-about .stage-rail-dot {
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--lake);
  box-sizing: border-box;
}

.page-about .stage-rail-item:nth-child(2) .stage-rail-dot { border-color: var(--amber); }
.page-about .stage-rail-item:last-child .stage-rail-dot { border-color: var(--orange); background: var(--orange-tint); }

.page-about .stage-rail-label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .stage-rail-note {
  flex: 1 1 100%;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--rock);
  opacity: .86;
}

.page-about .about-lede {
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.92;
  color: var(--ink);
  max-width: 34em;
  margin-bottom: 1.1em;
}

.page-about .about-hero-right p { max-width: 34em; }

.page-about .about-metabar {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-metabar li {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--lake-deep);
  background: var(--lake-tint);
  border: 1px solid rgba(15, 95, 115, .16);
  border-radius: var(--r-pill);
  padding: 6px 14px;
  white-space: nowrap;
}

/* ---------- 通用区块头 ---------- */

.page-about .about-sec { padding: var(--about-sec-pad) 0; }

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

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 10px;
  align-items: center;
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--orange);
  border: 1px solid var(--orange);
  border-radius: var(--r-pill);
  padding: 3px 11px;
  line-height: 1.5;
}

.page-about .about-h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 2.9vw, 37px);
  line-height: 1.26;
  letter-spacing: -.012em;
  color: var(--ink);
  margin: 0;
  text-wrap: balance;
}

.page-about .about-sub {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 46em;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-prose { max-width: 38em; }
.page-about .about-prose p { color: var(--rock); }

.page-about .about-inline-link {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 95, 115, .38);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible { border-bottom-color: var(--orange); color: var(--lake-deep); }

/* ---------- 01 起点 ---------- */

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-note {
  background: var(--lake-soft);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-lg);
  padding: clamp(20px, 2.6vw, 30px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-note-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: .04em;
  color: var(--lake-deep);
  margin: 0 0 14px;
}

.page-about .about-note-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.page-about .about-note-list li {
  position: relative;
  padding: 0 0 10px 16px;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lake);
}

.page-about .about-note-list li:last-child { padding-bottom: 0; }

.page-about .about-note-foot {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--lake-deep);
  opacity: .82;
  border-top: 1px solid rgba(15, 95, 115, .16);
  padding-top: 14px;
}

/* ---------- 图片 ---------- */

.page-about .about-figure { margin: 0 0 clamp(26px, 3.4vw, 42px); }

.page-about .about-figure-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--rock-line);
  background: linear-gradient(135deg, var(--lake-soft) 0%, rgba(217, 166, 74, .18) 100%);
  object-fit: cover;
}

.page-about .about-figure-cap {
  margin-top: 10px;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--rock);
  opacity: .88;
}

/* ---------- 02 三阶段时间轴 ---------- */

.page-about .about-timeline { position: relative; }

.page-about .about-timeline-track {
  display: none;
}

.page-about .about-timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 30px);
  position: relative;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 6%;
  right: 6%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--lake) 0%, var(--amber) 54%, var(--orange) 100%);
  opacity: .55;
}

.page-about .about-timeline-item {
  position: relative;
  padding-top: 30px;
}

.page-about .about-timeline-dot {
  position: absolute;
  top: 2px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper-hi);
  border: 2px solid var(--lake);
  box-sizing: border-box;
}

.page-about .about-timeline-item:nth-child(2) .about-timeline-dot { border-color: var(--amber); }
.page-about .about-timeline-item:nth-child(3) .about-timeline-dot { border-color: var(--orange); background: var(--orange); }

.page-about .about-timeline-phase {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--orange);
  margin: 0 0 6px;
}

.page-about .about-phase-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 12px;
}

.page-about .about-phase-text {
  font-size: var(--fs-sm);
  line-height: 1.82;
  color: var(--rock);
  margin: 0 0 16px;
}

.page-about .about-phase-stat {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--lake-deep);
  margin: 0;
  padding: 10px 14px;
  background: var(--lake-tint);
  border-radius: var(--r-md);
  border-left: 2px solid var(--lake);
}

/* ---------- 03 资料来源 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-split .about-figure { margin-bottom: 0; }

/* ---------- 04 三个小组 ---------- */

.page-about .about-team-list {
  list-style: none;
  margin: 0 0 clamp(26px, 3.4vw, 40px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 26px);
}

.page-about .about-team-item {
  position: relative;
  background: var(--paper-hi);
  border: 1px solid var(--rock-line);
  border-radius: var(--r-lg);
  padding: clamp(20px, 2.4vw, 28px);
  padding-top: clamp(26px, 3vw, 34px);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-team-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  background: linear-gradient(90deg, var(--lake) 0%, var(--amber) 100%);
}

.page-about .about-team-item:hover,
.page-about .about-team-item:focus-within {
  border-color: rgba(15, 95, 115, .45);
  transform: translateY(-2px);
}

.page-about .about-team-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--lake);
  border: 1px solid rgba(15, 95, 115, .3);
  border-radius: var(--r-pill);
  padding: 2px 10px;
  margin-bottom: 14px;
}

.page-about .about-team-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: .04em;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .about-team-text {
  font-size: var(--fs-sm);
  line-height: 1.82;
  color: var(--rock);
  margin: 0;
}

.page-about .about-crosscheck {
  background: var(--lake-soft);
  border-radius: var(--r-xl);
  padding: clamp(22px, 2.8vw, 34px);
  border-left: 3px solid var(--lake);
}

.page-about .about-crosscheck-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: .03em;
  color: var(--lake-deep);
  margin: 0 0 12px;
}

.page-about .about-crosscheck p:last-child {
  margin: 0;
  max-width: 52em;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--rock);
}

/* ---------- 05 规模 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .about-stat {
  border: 1px solid var(--rock-line);
  border-radius: var(--r-lg);
  background: var(--paper-hi);
  padding: clamp(20px, 2.4vw, 28px);
  position: relative;
  overflow: hidden;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, var(--lake) 0%, var(--amber) 100%);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.1;
  color: var(--ink);
  margin: 0 0 10px;
  letter-spacing: -.01em;
}

.page-about .about-stat-label {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-scale-note {
  max-width: 52em;
  font-size: var(--fs-sm);
  line-height: 1.88;
  color: var(--rock);
  margin: 0;
}

/* ---------- 06 两类使用者 ---------- */

.page-about .about-audience-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-audience-card {
  border: 1px solid var(--rock-line);
  border-left: 4px solid var(--lake);
  border-radius: var(--r-lg);
  background: var(--paper-hi);
  padding: clamp(22px, 2.8vw, 34px);
}

.page-about .about-audience-card-alt { border-left-color: var(--orange); }

.page-about .about-audience-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--lake-deep);
  background: var(--lake-tint);
  border-radius: var(--r-pill);
  padding: 4px 13px;
  margin: 0 0 16px;
}

.page-about .about-audience-tag-alt {
  color: #8A4512;
  background: var(--orange-tint);
}

.page-about .about-audience-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 1.9vw, 23px);
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 16px;
}

.page-about .about-audience-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .about-audience-list li {
  position: relative;
  padding: 0 0 11px 18px;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--rock);
}

.page-about .about-audience-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 8px;
  height: 1px;
  background: var(--lake);
}

.page-about .about-audience-card-alt .about-audience-list li::before { background: var(--orange); }

.page-about .about-audience-list li:last-child { padding-bottom: 0; }

.page-about .about-audience-foot {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--rock-line);
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--rock);
  opacity: .9;
}

.page-about .about-audience-link {
  margin: clamp(24px, 3vw, 36px) 0 0;
  font-size: var(--fs-sm);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta { padding-bottom: clamp(56px, 7vw, 96px); }

.page-about .about-cta-inner {
  background: linear-gradient(135deg, var(--lake-deep) 0%, var(--lake) 58%, #146B80 100%);
  border-radius: var(--r-xl);
  padding: clamp(28px, 4vw, 54px);
  color: var(--paper-hi);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta-inner::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 1px solid rgba(217, 166, 74, .38);
  pointer-events: none;
}

.page-about .about-cta-kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  color: var(--amber);
  margin: 0 0 12px;
}

.page-about .about-cta-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.28;
  color: var(--paper-hi);
  margin: 0 0 16px;
}

.page-about .about-cta-text {
  max-width: 48em;
  margin: 0 0 26px;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: rgba(255, 253, 249, .88);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
  z-index: 1;
}

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(26px, 5vw, 40px);
  }

  .page-about .about-h1 { margin-bottom: 26px; }

  .page-about .stage-rail::before { top: 12px; bottom: 10px; }

  .page-about .about-origin-grid,
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(26px, 5vw, 38px);
  }

  .page-about .about-timeline-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .about-timeline-list::before {
    top: 8px;
    bottom: 12px;
    left: 5px;
    right: auto;
    width: 2px;
    height: auto;
    background: linear-gradient(180deg, var(--lake) 0%, var(--amber) 56%, var(--orange) 100%);
  }

  .page-about .about-timeline-item {
    padding: 0 0 26px 30px;
  }

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

  .page-about .about-timeline-dot { top: 4px; }

  .page-about .about-team-list { grid-template-columns: minmax(0, 1fr); }

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

  .page-about .about-audience-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 600px) {
  .page-about { --fs-body: 16px; }

  .page-about .about-head {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 12px;
  }

  .page-about .about-num { justify-self: start; }

  .page-about .about-h1 { font-size: clamp(27px, 8vw, 36px); }

  .page-about .about-metabar { gap: 6px; margin-top: 20px; }

  .page-about .about-metabar li { font-size: 12px; padding: 5px 11px; }

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

  .page-about .about-team-item,
  .page-about .about-audience-card,
  .page-about .about-note { padding: 20px 18px; }

  .page-about .about-cta-inner { border-radius: var(--r-lg); }

  .page-about .about-cta-actions { flex-direction: column; align-items: stretch; }

  .page-about .about-cta-actions .btn { text-align: center; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-item {
    transition: none;
  }
  .page-about .about-team-item:hover,
  .page-about .about-team-item:focus-within {
    transform: none;
  }
}