.page-about {
  --about-gold-glow: rgba(212, 175, 55, 0.18);
  overflow-x: hidden;
}

/* ===== 首屏 Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 36px) 20px 52px;
  background:
    radial-gradient(circle at 84% 18%, var(--about-gold-glow) 0%, rgba(212, 175, 55, 0) 42%),
    linear-gradient(142deg, var(--c-night) 0%, var(--c-night-2) 58%, #13314F 100%);
  color: var(--c-paper);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  width: 380px;
  height: 380px;
  right: -140px;
  top: -130px;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.55), rgba(230, 206, 122, 0.14));
  border-radius: 50%;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 0 100%);
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  max-width: var(--max-w);
  margin: 0 auto;
}

.page-about .about-hero .breadcrumb {
  font-size: 0.92rem;
  margin-bottom: 4px;
}

.page-about .about-hero .breadcrumb a {
  color: var(--c-gold-soft);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--c-gold);
}

.page-about .about-hero-kicker {
  font-family: var(--font-note);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--c-gold-soft);
  margin: 0 0 10px;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5.2vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  margin: 0 0 18px;
  max-width: 13em;
}

.page-about .about-hero-lead {
  font-size: 1.02rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.82);
  max-width: 36em;
  margin: 0 0 22px;
}

.page-about .about-hero-lead strong {
  color: var(--c-gold-soft);
  font-weight: 700;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}

.page-about .about-hero-bignum-wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 8px;
  padding-top: 22px;
  border-top: 1px solid rgba(245, 247, 250, 0.16);
}

.page-about .about-hero-bignum {
  font-family: var(--font-display);
  font-size: clamp(3.6rem, 12vw, 7rem);
  line-height: 0.86;
  color: var(--c-gold);
  letter-spacing: -0.02em;
}

.page-about .about-hero-plus {
  font-family: var(--font-display);
  font-size: 2.4rem;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-hero-bignum-note {
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: rgba(245, 247, 250, 0.72);
  max-width: 14em;
  line-height: 1.5;
}

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 32px 64px;
  }
  .page-about .about-hero-inner {
    grid-template-columns: 1fr 280px;
    align-items: center;
    column-gap: 36px;
  }
  .page-about .about-hero .breadcrumb {
    grid-column: 1 / -1;
  }
  .page-about .about-hero-copy {
    grid-column: 1;
  }
  .page-about .about-hero-visual {
    grid-column: 2;
    grid-row: 2 / 4;
    justify-self: end;
  }
  .page-about .about-hero-visual img {
    max-width: 280px;
  }
  .page-about .about-hero-bignum-wrap {
    grid-column: 1;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero-inner {
    grid-template-columns: 1fr 340px;
    column-gap: 48px;
  }
  .page-about .about-hero-copy h1 {
    font-size: 3.5rem;
  }
  .page-about .about-hero-visual img {
    max-width: 320px;
  }
}

/* ===== 平台简介 ===== */
.page-about .about-intro {
  position: relative;
  z-index: 3;
  margin-top: -18px;
  border-radius: 36px 36px 0 0;
  background: var(--c-paper);
  color: var(--c-ink);
}

.page-about .about-intro-grid {
  display: grid;
  gap: 28px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 64px 20px 72px;
}

.page-about .about-rail {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.page-about .about-rail .note-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-note);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.page-about .about-rail-index {
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-intro-body {
  max-width: 46em;
}

.page-about .about-intro-body .eyebrow {
  margin-bottom: 6px;
}

.page-about .about-intro-body h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 18px;
  color: var(--c-ink);
}

.page-about .about-intro-text {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(16, 32, 43, 0.82);
  margin: 0 0 14px;
}

.page-about .about-intro-text strong {
  color: var(--c-action);
  font-weight: 700;
}

.page-about .about-intro-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

@media (min-width: 780px) {
  .page-about .about-intro-grid {
    grid-template-columns: 220px 1fr;
    gap: 40px;
    padding: 80px 32px 88px;
  }
}

/* ===== 双栏杂志区：里程碑 + 数据 ===== */
.page-about .about-record {
  position: relative;
  background: linear-gradient(155deg, var(--c-night) 0%, var(--c-night-2) 64%, #0E2A4E 100%);
  color: var(--c-paper);
}

.page-about .about-record::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 247, 250, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 247, 250, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about .about-record-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 56px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 72px 20px 80px;
}

.page-about .about-record-head .eyebrow {
  margin-bottom: 6px;
  color: var(--c-gold-soft);
}

.page-about .about-record-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.18;
  margin: 0 0 8px;
  color: var(--c-paper);
}

.page-about .about-record-desc {
  font-size: 0.94rem;
  line-height: 1.6;
  color: rgba(245, 247, 250, 0.66);
  margin: 0;
  max-width: 30em;
}

@media (min-width: 900px) {
  .page-about .about-record-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }
}

/* ===== 时间线 ===== */
.page-about .milestone-track {
  position: relative;
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 10px;
  margin-top: 28px;
  padding-top: 10px;
}

.page-about .milestone-svg {
  width: 100%;
  min-width: 48px;
  height: auto;
}

.page-about .milestone-line {
  stroke: rgba(212, 175, 55, 0.45);
  stroke-width: 2;
  stroke-linecap: round;
}

.page-about .milestone-dot {
  stroke-width: 3;
  stroke: var(--c-night);
}

.page-about .milestone-dot-gold { fill: var(--c-gold); }
.page-about .milestone-dot-orange { fill: var(--c-action); }
.page-about .milestone-dot-soft { fill: var(--c-gold-soft); }

.page-about .milestone-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .milestone-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 14px 14px 14px 0;
  border-bottom: 1px solid rgba(245, 247, 250, 0.12);
  transition: transform var(--transition), background var(--transition);
}

.page-about .milestone-item:hover {
  transform: translateX(4px);
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.1), transparent);
}

.page-about .milestone-year {
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--c-gold);
  white-space: nowrap;
  min-width: 4ch;
}

.page-about .milestone-text {
  font-size: 0.94rem;
  line-height: 1.55;
  color: rgba(245, 247, 250, 0.78);
}

/* ===== 数据卡墙 ===== */
.page-about .about-stat-wall {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 24px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(212, 175, 55, 0.24);
  background: linear-gradient(145deg, rgba(27, 58, 92, 0.94), rgba(14, 42, 78, 0.76));
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-stat-card::after {
  content: "";
  position: absolute;
  width: 92px;
  height: 92px;
  right: -28px;
  top: -28px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.22), transparent 68%);
}

.page-about .about-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .about-stat-num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1;
  color: var(--c-gold);
  letter-spacing: -0.01em;
}

.page-about .about-stat-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .about-stat-note {
  font-size: 0.85rem;
  line-height: 1.45;
  color: rgba(245, 247, 250, 0.6);
}

.page-about .about-chart {
  margin: 24px 0 0;
}

.page-about .about-chart img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}

.page-about .about-chart figcaption {
  margin-top: 8px;
  font-family: var(--font-note);
  font-size: 0.82rem;
  color: rgba(245, 247, 250, 0.55);
  text-align: right;
}

@media (min-width: 620px) {
  .page-about .about-stat-wall {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-stat-card-lg,
  .page-about .about-stat-card-wide {
    grid-column: 1 / -1;
  }
}

/* ===== 安全合规体系 ===== */
.page-about .about-security {
  border-radius: 0 0 36px 36px;
  background: var(--c-paper);
  color: var(--c-ink);
}

.page-about .about-security-grid {
  display: grid;
  gap: 32px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 72px 20px 80px;
}

.page-about .about-security-visual img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}

.page-about .about-security-content .eyebrow {
  margin-bottom: 6px;
}

.page-about .about-security-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 16px;
  color: var(--c-ink);
}

.page-about .about-security-content > p {
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(16, 32, 43, 0.8);
  max-width: 42em;
  margin: 0 0 24px;
}

.page-about .about-security-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-security-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: #FFFFFF;
  border: 1px solid rgba(16, 32, 43, 0.08);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), border-color var(--transition);
}

.page-about .about-security-list li:hover {
  transform: translateX(4px);
  border-color: var(--c-gold);
}

.page-about .security-badge {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--c-gold), var(--c-gold-soft));
  color: var(--c-night);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.page-about .about-security-list strong {
  display: block;
  font-size: 0.98rem;
  color: var(--c-ink);
  margin-bottom: 4px;
}

.page-about .about-security-list p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--c-muted);
  margin: 0;
}

.page-about .about-security-content .btn {
  font-size: 0.95rem;
}

@media (min-width: 840px) {
  .page-about .about-security-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    gap: 50px;
    padding: 88px 32px 96px;
  }
}

/* ===== 滚动显现协议（渐进增强） ===== */
.page-about [data-reveal] {
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.page-about [data-reveal]:not([data-revealed]) {
  opacity: 0.85;
  transform: translateY(10px);
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

.page-about [data-reveal-delay="80"] { transition-delay: 0.08s; }
.page-about [data-reveal-delay="140"] { transition-delay: 0.14s; }
.page-about [data-reveal-delay="200"] { transition-delay: 0.2s; }
.page-about [data-reveal-delay="260"] { transition-delay: 0.26s; }