.page-about {
  --about-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --about-rail-w: min(440px, 38vw);
  background: var(--warm);
  color: var(--navy);
  font-family: var(--f-body);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  min-height: 100svh;
}

/* ---------- 左侧固定叙事摘要 ---------- */
.page-about .about-rail {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 28px;
  background: var(--navy);
  color: var(--warm);
  padding: clamp(28px, 5vw, 56px);
  overflow: hidden;
  min-height: 640px;
}

.page-about .about-rail-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.16;
  mix-blend-mode: lighten;
  pointer-events: none;
}

.page-about .about-rail-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  gap: 24px;
}

.page-about .about-rail-top {
  padding-top: 6px;
}

.page-about .about-kicker {
  font-family: var(--f-num);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--green);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.page-about .about-h1 {
  font-family: var(--f-head);
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.08;
  color: var(--warm);
  margin: 0 0 18px;
  letter-spacing: 0.01em;
}

.page-about .about-lead {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 244, 240, 0.82);
  max-width: 40ch;
}

.page-about .about-rail-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(201, 160, 99, 0.4);
}

.page-about .about-rail-stat {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-md);
  padding: 14px 16px;
}

.page-about .rail-stat-num {
  display: block;
  font-family: var(--f-num);
  font-size: 26px;
  font-weight: 600;
  color: var(--green);
  line-height: 1;
}

.page-about .rail-stat-label {
  display: block;
  font-size: 12px;
  color: rgba(244, 244, 240, 0.68);
  margin-top: 4px;
}

.page-about .about-rail-quote {
  border-left: 2px solid var(--gold);
  padding-left: 18px;
  font-family: var(--f-head);
  font-size: 16px;
  line-height: 1.65;
  color: rgba(244, 244, 240, 0.92);
  margin: 4px 0 0;
}

.page-about .about-rail-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-family: var(--f-num);
  font-size: 13px;
  line-height: 1.6;
  color: rgba(244, 244, 240, 0.72);
}

.page-about .about-rail-contact a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 136, 0.4);
  padding-bottom: 1px;
}

.page-about .about-rail-contact a:hover {
  color: var(--warm);
  border-color: var(--warm);
}

/* ---------- 右侧主内容 ---------- */
.page-about .about-main {
  min-width: 0;
  background: var(--warm);
}

.page-about .about-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(20px, 4vw, 56px);
  border-bottom: 1px solid rgba(11, 31, 58, 0.12);
  background: rgba(244, 244, 240, 0.92);
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  backdrop-filter: blur(8px);
}

.page-about .about-topbar .breadcrumb {
  margin: 0;
}

.page-about .about-breadcrumb-sep {
  margin: 0 10px;
  color: var(--gray);
}

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

.page-about .about-chapter-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 14px clamp(20px, 4vw, 56px);
  background: var(--warm);
  border-bottom: 1px solid rgba(11, 31, 58, 0.07);
  scrollbar-width: none;
}

.page-about .about-chapter-strip::-webkit-scrollbar {
  display: none;
}

.page-about .about-chapter-strip a {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(11, 31, 58, 0.18);
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  text-decoration: none;
  transition: all 0.3s var(--about-ease);
}

.page-about .about-chapter-strip a:hover {
  background: var(--navy);
  color: var(--warm);
  border-color: var(--navy);
}

/* ---------- 章节基础 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(48px, 7vw, 88px) clamp(20px, 5vw, 64px);
  overflow: hidden;
}

.page-about .about-section--light {
  background: var(--warm);
  color: var(--navy);
}

.page-about .about-section--dark,
.page-about .about-section--deep {
  background:
    linear-gradient(150deg, rgba(57, 255, 136, 0.05) 0 30%, transparent 30%),
    var(--dark);
  color: var(--warm);
}

.page-about .about-section--navy {
  background:
    linear-gradient(140deg, rgba(201, 160, 99, 0.1) 0 18%, transparent 18%),
    var(--navy);
  color: var(--warm);
}

.page-about .about-section--dark::before,
.page-about .about-section--navy::before,
.page-about .about-section--deep::before {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 140px;
  height: 4px;
  background: linear-gradient(90deg, var(--green), var(--gold));
  border-radius: 0 4px 4px 0;
}

.page-about .about-section-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.page-about .about-section-inner--wide {
  max-width: 900px;
}

/* ---------- 大编号与标题 ---------- */
.page-about .about-watermark {
  position: absolute;
  top: 24px;
  right: clamp(16px, 3vw, 40px);
  font-family: var(--f-num);
  font-size: clamp(64px, 8vw, 110px);
  font-weight: 500;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(11, 31, 58, 0.18);
  pointer-events: none;
}

.page-about .about-section--dark .about-watermark,
.page-about .about-section--navy .about-watermark,
.page-about .about-section--deep .about-watermark {
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.16);
}

.page-about .about-sec-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 12px;
}

.page-about .about-sec-tag::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-section--dark .about-sec-tag,
.page-about .about-section--navy .about-sec-tag,
.page-about .about-section--deep .about-sec-tag {
  color: var(--green);
}

.page-about .about-section--dark .about-sec-tag::before,
.page-about .about-section--navy .about-sec-tag::before,
.page-about .about-section--deep .about-sec-tag::before {
  background: var(--green);
}

.page-about .about-h2 {
  font-family: var(--f-head);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.15;
  color: var(--navy);
  margin: 0 0 16px;
  letter-spacing: 0.01em;
}

.page-about .about-section--dark .about-h2,
.page-about .about-section--navy .about-h2,
.page-about .about-section--deep .about-h2 {
  color: var(--warm);
}

.page-about .about-body {
  font-size: 16px;
  line-height: 1.85;
  color: inherit;
  margin: 16px 0 0;
  max-width: 68ch;
}

.page-about .about-body strong {
  color: var(--gold);
  font-weight: 700;
}

.page-about .about-section--light .about-body strong {
  color: var(--navy);
}

.page-about .about-quote {
  margin: 28px 0 0;
  padding: 22px 24px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  background: rgba(11, 31, 58, 0.04);
  font-family: var(--f-head);
  font-size: 17px;
  line-height: 1.7;
  color: inherit;
}

.page-about .about-section--dark .about-quote,
.page-about .about-section--navy .about-quote,
.page-about .about-section--deep .about-quote {
  background: rgba(255, 255, 255, 0.06);
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-track-wrap {
  position: relative;
  margin-top: 40px;
}

.page-about .about-track-wrap::before {
  content: "";
  position: absolute;
  top: 34px;
  left: 8px;
  right: 8px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(201, 160, 99, 0.25) 70%, transparent);
  pointer-events: none;
}

.page-about .about-track-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  text-transform: uppercase;
  margin: 0 0 14px;
}

.page-about .milestone-track {
  position: relative;
  z-index: 1;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 86%;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 4px 4px 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--green) transparent;
}

.page-about .milestone-card {
  scroll-snap-align: start;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-lg);
  padding: 24px;
  transition: border-color 0.3s var(--about-ease), transform 0.3s var(--about-ease);
}

.page-about .milestone-card:hover {
  border-color: var(--green);
  transform: translateY(-3px);
}

.page-about .milestone-card::before {
  content: "";
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(57, 255, 136, 0.16);
  margin-bottom: 18px;
}

.page-about .milestone-year {
  font-family: var(--f-num);
  font-size: 28px;
  font-weight: 600;
  color: var(--green);
  line-height: 1;
}

.page-about .milestone-title {
  font-family: var(--f-head);
  font-size: 18px;
  color: var(--warm);
  margin: 10px 0 8px;
}

.page-about .milestone-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 244, 240, 0.72);
}

.page-about .milestone-details {
  margin-top: 12px;
  border-top: 1px dashed rgba(201, 160, 99, 0.3);
  padding-top: 10px;
}

.page-about .milestone-details summary {
  font-size: 13px;
  font-weight: 600;
  color: var(--gold);
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone-details summary::before {
  content: "＋ ";
  color: var(--green);
}

.page-about .milestone-details[open] summary::before {
  content: "－ ";
}

.page-about .milestone-details p {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 244, 240, 0.7);
  margin: 8px 0 0;
}

/* ---------- 数据服务覆盖 ---------- */
.page-about .coverage-layout {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .about-media-coverage,
.page-about .about-media-office {
  margin: 0;
}

.page-about .about-media-coverage img,
.page-about .about-media-office img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .about-media-caption {
  padding: 10px 2px 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-section--navy .about-media-caption,
.page-about .about-section--deep .about-media-caption {
  color: rgba(244, 244, 240, 0.6);
}

.page-about .coverage-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .coverage-stat {
  background: var(--white);
  border: 1px solid rgba(11, 31, 58, 0.1);
  border-radius: var(--r-lg);
  padding: 18px 20px;
  box-shadow: 0 4px 14px rgba(11, 31, 58, 0.05);
}

.page-about .coverage-stat--dark {
  background: var(--navy);
  border-color: var(--navy);
}

.page-about .coverage-stat .stat-num {
  display: block;
  font-family: var(--f-num);
  font-size: 30px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.1;
}

.page-about .coverage-stat--dark .stat-num {
  color: var(--green);
}

.page-about .coverage-stat .stat-label {
  display: block;
  font-size: 13px;
  color: var(--gray);
  margin-top: 4px;
  line-height: 1.4;
}

.page-about .coverage-stat--dark .stat-label {
  color: rgba(244, 244, 240, 0.7);
}

/* ---------- 团队与组织 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .team-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-lg);
  padding: 26px;
  transition: border-color 0.3s var(--about-ease), background 0.3s var(--about-ease);
}

.page-about .team-card:hover {
  border-color: var(--green);
  background: rgba(57, 255, 136, 0.06);
}

.page-about .team-role-tag {
  font-family: var(--f-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .team-card h3 {
  font-family: var(--f-head);
  font-size: 20px;
  color: var(--warm);
  margin: 8px 0 10px;
}

.page-about .team-card p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 244, 240, 0.72);
  margin: 0;
}

.page-about .about-media-office {
  margin-top: 28px;
}

/* ---------- 用户价值 ---------- */
.page-about .value-grid {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}

.page-about .value-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-lg);
  padding: 20px 22px;
  transition: border-color 0.3s var(--about-ease);
}

.page-about .value-card:hover {
  border-color: var(--green);
}

.page-about .value-index {
  font-family: var(--f-num);
  font-size: 16px;
  font-weight: 600;
  color: var(--green);
  line-height: 1.4;
  flex: 0 0 auto;
}

.page-about .value-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--warm);
  margin: 0 0 4px;
}

.page-about .value-card p {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(244, 244, 240, 0.7);
  margin: 0;
}

/* ---------- CTA 与联系卡片 ---------- */
.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-contact-card {
  margin-top: 40px;
  padding: 24px;
  border: 1px solid rgba(201, 160, 99, 0.35);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(201, 160, 99, 0.12), rgba(57, 255, 136, 0.06));
}

.page-about .about-contact-card h3 {
  font-family: var(--f-head);
  font-size: 20px;
  color: var(--warm);
  margin: 0 0 8px;
}

.page-about .about-contact-card p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 244, 240, 0.72);
  margin: 0;
}

.page-about .about-contact-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  font-family: var(--f-num);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 244, 240, 0.82);
}

.page-about .about-contact-list a {
  color: var(--green);
  text-decoration: none;
}

.page-about .about-contact-list a:hover {
  text-decoration: underline;
}

/* ---------- 响应式布局 ---------- */
@media (min-width: 640px) {
  .page-about .milestone-track {
    grid-auto-columns: minmax(280px, 42%);
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .coverage-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 0;
    height: 100vh;
    min-height: 100vh;
  }

  .page-about .about-chapters {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 13px;
  }

  .page-about .about-chapters a {
    color: var(--navy);
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: color 0.3s var(--about-ease);
  }

  .page-about .about-chapters a:hover {
    color: var(--green);
  }

  .page-about .about-chapter-strip {
    display: none;
  }

  .page-about .milestone-track {
    grid-auto-columns: 300px;
  }

  .page-about .about-section {
    padding: clamp(56px, 6vw, 96px) clamp(40px, 6vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .milestone-card,
  .page-about .team-card,
  .page-about .value-card,
  .page-about .about-chapters a,
  .page-about .about-chapter-strip a {
    transition: none;
  }
}