.page-about {
  --about-gold-grad: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-light));
  --about-sec-space: 64px;
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  min-height: 560px;
  padding: 84px 0 64px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-gold);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.page-about .about-hero-mask {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(212,175,55,0.10) 0%, transparent 52%),
    linear-gradient(100deg, rgba(11,7,33,0.94) 0%, rgba(11,7,33,0.84) 45%, rgba(28,21,69,0.72) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

.page-about .about-hero-content .hero-note {
  margin-bottom: 18px;
}

.page-about .about-hero-content .page-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  max-width: 780px;
  margin-bottom: 0;
}

.page-about .about-hero-content .page-intro {
  margin-top: 18px;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 640px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-hero-aside {
  display: none;
}

.page-about .about-hero-wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 48px;
  z-index: 1;
  pointer-events: none;
}

.page-about .about-hero-wave svg {
  display: block;
  width: 100%;
  height: 48px;
}

/* ===== 主体布局 ===== */
.page-about .about-layout {
  padding: 44px 0 72px;
}

.page-about .about-index {
  margin-bottom: 36px;
}

.page-about .about-index-inner {
  background: var(--bg-panel);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-card);
  padding: 20px;
  position: relative;
}

.page-about .about-index-title {
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--accent-gold-light);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.page-about .about-index-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(212,175,55,0.28);
  border-radius: var(--radius-btn);
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: all 0.24s var(--ease);
  background: rgba(42,33,107,0.35);
}

.page-about .about-index-link:hover {
  color: var(--text-primary);
  border-color: var(--accent-gold);
  background: var(--bg-soft);
  transform: translateY(-2px);
}

.page-about .about-index-no {
  font-family: var(--font-index);
  color: var(--accent-gold);
  font-size: 12px;
}

.page-about .about-index-foot {
  display: none;
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  margin-bottom: var(--about-sec-space);
  padding-top: 8px;
}

.page-about .about-section-head {
  margin-bottom: 24px;
  position: relative;
}

.page-about .about-section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  line-height: 1.35;
  margin-top: 12px;
  margin-bottom: 0;
  position: relative;
  padding-left: 18px;
}

.page-about .about-section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--about-gold-grad);
  transform: skewY(18deg);
  border-radius: 2px;
}

.page-about .about-section-lead {
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 28px;
  max-width: 860px;
}

.page-about .about-section-lead p + p {
  margin-top: 14px;
}

/* ===== 品牌定位卡片 ===== */
.page-about .about-brand-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-brand-card {
  position: relative;
  padding: 24px;
  border: 1px solid var(--border-gold);
  background: linear-gradient(160deg, rgba(42,33,107,0.48) 0%, rgba(28,21,69,0.80) 100%);
  border-radius: var(--radius-card);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .about-brand-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-gold);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}

.page-about .about-brand-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.page-about .about-brand-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.page-about .about-brand-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.page-about .about-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-gold-light);
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), gap 0.2s var(--ease);
}

.page-about .about-brand-link:hover {
  border-color: var(--accent-gold);
  gap: 10px;
}

/* ===== 时间轴 ===== */
.page-about .about-timeline-wrap {
  display: grid;
  gap: 28px;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, rgba(212,175,55,0.65), rgba(212,175,55,0.12));
}

.page-about .about-tl-item {
  position: relative;
  margin-bottom: 28px;
}

.page-about .about-tl-item:last-child {
  margin-bottom: 0;
}

.page-about .about-tl-node {
  position: absolute;
  left: -34px;
  top: 28px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--accent-gold);
  background: var(--bg-deep);
  box-shadow: 0 0 0 4px rgba(212,175,55,0.15);
  z-index: 1;
}

.page-about .about-tl-node--active {
  background: var(--accent-gold);
  box-shadow: 0 0 0 6px rgba(212,175,55,0.22), 0 0 18px rgba(212,175,55,0.4);
}

.page-about .about-tl-card {
  padding: 22px;
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, rgba(28,21,69,0.92), rgba(11,7,33,0.78));
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-tl-card:hover {
  transform: translateX(4px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.3);
}

.page-about .about-tl-card--active {
  border-color: rgba(212,175,55,0.7);
  background: linear-gradient(150deg, rgba(42,33,107,0.92), rgba(28,21,69,0.85));
}

.page-about .about-tl-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-tl-version {
  font-family: var(--font-index);
  font-size: 1.4rem;
  color: var(--accent-gold);
  letter-spacing: 0.04em;
  line-height: 1;
}

.page-about .about-tl-card h3 {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  margin-bottom: 8px;
}

.page-about .about-tl-card p {
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.75;
}

.page-about .about-timeline-visual {
  padding: 0 4px;
}

.page-about .about-timeline-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border-gold);
  display: block;
}

.page-about .about-timeline-note {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
  border-left: 2px solid var(--accent-gold);
  padding-left: 12px;
  line-height: 1.7;
}

/* ===== 规模统计 ===== */
.page-about .about-scale-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-scale-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .about-stat-card {
  padding: 20px;
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-card);
  background: linear-gradient(145deg, rgba(28,21,69,0.90), rgba(11,7,33,0.72));
  position: relative;
  overflow: hidden;
}

.page-about .about-stat-card::after {
  content: "";
  position: absolute;
  right: -20px;
  top: -20px;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212,175,55,0.14), transparent 70%);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4.5vw, 2.2rem);
  line-height: 1.1;
  color: var(--accent-gold-light);
  margin-bottom: 6px;
}

.page-about .about-stat-label {
  display: block;
  font-family: var(--font-index);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.page-about .about-stat-desc {
  display: block;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .about-scale-visual {
  position: relative;
}

.page-about .about-scale-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--border-gold);
  display: block;
}

.page-about .about-scale-note {
  margin-top: 18px;
  padding: 20px;
  border: 1px solid rgba(212,175,55,0.25);
  border-radius: var(--radius-card);
  background: rgba(28,21,69,0.65);
}

.page-about .about-scale-note-title {
  font-family: var(--font-index);
  color: var(--accent-gold-light);
  letter-spacing: 0.1em;
  font-size: 0.82rem;
  margin-bottom: 12px;
}

.page-about .about-scale-note ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .about-scale-note li {
  position: relative;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.8;
}

.page-about .about-scale-note li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--accent-gold);
}

/* ===== 资质卡片 ===== */
.page-about .about-qual-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-qual-card {
  padding: 26px 24px;
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-card);
  background: linear-gradient(155deg, rgba(42,33,107,0.42), rgba(28,21,69,0.78));
  position: relative;
  overflow: hidden;
}

.page-about .about-qual-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--about-gold-grad);
  opacity: 0.8;
}

.page-about .about-qual-icon {
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--bg-soft);
  color: var(--accent-gold-light);
  margin-bottom: 16px;
  border: 1px solid rgba(212,175,55,0.3);
}

.page-about .about-qual-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.page-about .about-qual-card p {
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.8;
}

/* ===== 会员档位 ===== */
.page-about .about-tier-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-tier-card {
  padding: 22px 20px;
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, rgba(28,21,69,0.82), rgba(11,7,33,0.74));
  position: relative;
  text-align: center;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-tier-card::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: var(--about-gold-grad);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.page-about .about-tier-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.page-about .about-tier-card:hover::after {
  transform: scaleX(1);
}

.page-about .about-tier-icon {
  width: 62px;
  height: 62px;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-gold);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, var(--accent-gold), rgba(212,175,55,0.15));
  color: var(--bg-deep);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-indent: 0.08em;
}

.page-about .about-tier-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--accent-gold-light);
}

.page-about .about-tier-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.page-about .about-tier-tag {
  font-size: 0.78rem;
}

/* ===== 底部连接 ===== */
.page-about .about-outro {
  margin-top: 12px;
}

.page-about .about-outro-inner {
  border: 1px solid var(--border-gold);
  border-radius: 20px 30px 20px 30px;
  padding: 32px 24px;
  background: linear-gradient(135deg, rgba(42,33,107,0.55), rgba(28,21,69,0.85));
  position: relative;
  overflow: hidden;
}

.page-about .about-outro-inner::before {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212,175,55,0.12), transparent 70%);
}

.page-about .about-outro-text .hero-note {
  margin-bottom: 10px;
}

.page-about .about-outro-text h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  line-height: 1.4;
  margin-bottom: 10px;
}

.page-about .about-outro-text p:not(.hero-note) {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
}

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

/* ===== 桌面端 ===== */
@media (min-width: 992px) {
  .page-about .about-hero {
    min-height: 620px;
    padding: 120px 0 80px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1fr 220px;
    align-items: center;
  }

  .page-about .about-hero-aside {
    display: block;
  }

  .page-about .about-hero-seal {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .page-about .about-hero-seal-ring {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 2px solid var(--accent-gold);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, rgba(212,175,55,0.18), transparent 68%);
    box-shadow: 0 0 0 8px rgba(212,175,55,0.08), inset 0 0 32px rgba(212,175,55,0.08);
  }

  .page-about .about-hero-seal-core {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--accent-gold-light);
    text-align: center;
    line-height: 1.3;
    letter-spacing: 0.12em;
  }

  .page-about .about-hero-seal-sub {
    font-family: var(--font-index);
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 6px;
    letter-spacing: 0.1em;
  }

  .page-about .about-hero-seal-line {
    display: block;
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--accent-gold), transparent);
    margin-top: 20px;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: 230px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }

  .page-about .about-index-inner {
    padding: 24px 20px;
  }

  .page-about .about-index-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-index-link {
    display: flex;
    justify-content: space-between;
    padding: 10px 12px;
    font-size: 13px;
  }

  .page-about .about-index-foot {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(212,175,55,0.2);
    color: var(--text-muted);
    font-family: var(--font-index);
    font-size: 12px;
    letter-spacing: 0.16em;
  }

  .page-about .about-index-foot .index-num {
    color: var(--accent-gold);
  }

  .page-about .about-brand-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
  }

  .page-about .about-timeline-visual {
    padding-top: 20px;
  }

  .page-about .about-scale-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
    align-items: center;
  }

  .page-about .about-qual-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-tier-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
  }

  .page-about .about-outro-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    padding: 44px 40px;
  }

  .page-about .about-outro-text {
    flex: 1;
  }

  .page-about .about-outro-text .hero-note {
    margin-bottom: 8px;
  }

  .page-about .about-outro-text p:not(.hero-note) {
    margin-bottom: 0;
  }
}

@media (max-width: 420px) {
  .page-about .about-scale-stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-stat-card {
    padding: 18px;
  }

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

  .page-about .about-tier-card {
    padding: 18px 14px;
  }
}