.page-about {
  background-color: var(--ivory);
  color: var(--charcoal);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== Hero 横幅 ===== */
.page-about .about-hero {
  background: linear-gradient(135deg, var(--deep) 0%, var(--deep-2) 58%, var(--deep-3) 100%);
  color: var(--ivory);
  padding: 64px 0 56px;
  position: relative;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(201, 168, 76, 0.32) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), transparent 70%);
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 40px;
  font-size: 14px;
  color: rgba(248, 244, 236, 0.6);
}

.page-about .about-breadcrumb a {
  color: var(--gold-light);
  text-decoration: none;
  transition: color 0.3s;
}

.page-about .about-breadcrumb a:hover {
  color: var(--coral);
}

.page-about .breadcrumb-sep {
  color: rgba(248, 244, 236, 0.35);
}

.page-about .about-hero-inner {
  display: grid;
  gap: 40px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-content {
  max-width: 720px;
}

.page-about .about-hero .exhibit-tag {
  border-left-color: var(--gold);
  color: var(--gold-light);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 16px 0 20px;
  color: var(--ivory);
  letter-spacing: 0.02em;
}

.page-about .about-hero-sub {
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(248, 244, 236, 0.85);
  max-width: 600px;
  margin-bottom: 32px;
}

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

.page-about .about-hero .btn-ghost {
  border-color: rgba(248, 244, 236, 0.6);
  color: var(--ivory);
}

.page-about .about-hero .btn-ghost:hover {
  border-color: var(--coral);
  color: var(--coral);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.page-about .about-stat-card {
  background: rgba(248, 244, 236, 0.07);
  border: 1px solid rgba(201, 168, 76, 0.3);
  border-radius: 4px;
  padding: 20px 14px;
  text-align: center;
  transition: background 0.3s, transform 0.3s;
}

.page-about .about-stat-card:hover {
  background: rgba(201, 168, 76, 0.12);
  transform: translateY(-4px);
}

.page-about .about-stat-num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--gold);
  display: block;
  margin-bottom: 6px;
}

.page-about .about-stat-label {
  font-size: 0.8rem;
  color: rgba(248, 244, 236, 0.7);
}

/* ===== 章节标题通用 ===== */
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 48px;
  padding-bottom: 16px;
  border-bottom: 3px solid var(--gold);
}

.page-about .about-section-head .section-index {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  flex-shrink: 0;
  display: block;
  min-width: 72px;
  letter-spacing: -0.02em;
}

.page-about .about-section-heading {
  padding-top: 4px;
}

.page-about .about-section-kicker {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  color: var(--slate);
  margin: 0 0 4px;
  text-transform: uppercase;
}

.page-about .about-section-heading h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--deep);
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
}

/* ===== 01 品牌故事 ===== */
.page-about .about-story-section {
  padding: 64px 0;
  background: var(--ivory);
}

.page-about .about-story-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-story-copy p {
  margin-bottom: 16px;
  color: var(--charcoal);
}

.page-about .about-story-copy a {
  color: var(--deep-2);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--gold);
  transition: color 0.3s;
}

.page-about .about-story-copy a:hover {
  color: var(--coral);
}

.page-about .about-story-quote {
  margin-top: 28px;
  padding: 20px 24px;
  border-left: 4px solid var(--gold);
  background: var(--ivory-dark);
  font-style: italic;
}

.page-about .about-story-quote p {
  font-size: 1.1rem;
  color: var(--deep);
  margin-bottom: 8px;
}

.page-about .about-story-quote span {
  font-size: 0.85rem;
  color: var(--slate);
}

.page-about .about-story-figure,
.page-about .about-journey-banner,
.page-about .about-eco-figure {
  margin: 0;
}

.page-about .about-story-figure img,
.page-about .about-journey-banner img,
.page-about .about-eco-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 3px solid var(--deep);
  box-shadow: var(--shadow-hard);
}

.page-about .frame-caption {
  font-size: 0.85rem;
  color: var(--slate);
  margin-top: 10px;
}

/* ===== 02 发展历程 ===== */
.page-about .about-journey-section {
  background: var(--ivory-dark);
  padding: 64px 0;
}

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

.page-about .about-timeline {
  position: relative;
  padding-left: 24px;
  border-left: 3px solid var(--gold-dark);
  margin-left: 4px;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 36px 20px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--deep);
  border: 3px solid var(--gold);
}

.page-about .about-timeline-marker {
  margin-bottom: 8px;
}

.page-about .about-timeline-year {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--deep);
}

.page-about .about-timeline-card {
  background: var(--ivory);
  border: 3px solid var(--deep);
  box-shadow: var(--shadow-hard);
  padding: 20px 24px;
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 8px;
  color: var(--deep);
}

.page-about .about-timeline-card p {
  font-size: 0.95rem;
  color: var(--charcoal);
  margin: 0;
}

/* ===== 03 资质与荣誉 ===== */
.page-about .about-credential-section {
  background: var(--deep);
  padding: 64px 0;
}

.page-about .about-credential-section .about-section-heading h2 {
  color: var(--ivory);
}

.page-about .about-credential-section .about-section-kicker {
  color: var(--gold-light);
}

.page-about .about-credential-section .about-section-head {
  border-bottom-color: rgba(201, 168, 76, 0.4);
}

.page-about .about-credential-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-credential-card {
  background: rgba(248, 244, 236, 0.07);
  border: 1px solid rgba(201, 168, 76, 0.35);
  padding: 24px 20px;
  text-align: center;
  transition: background 0.3s, transform 0.3s;
}

.page-about .about-credential-card:hover {
  background: rgba(201, 168, 76, 0.14);
  transform: translateY(-4px);
}

.page-about .about-credential-badge {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 3px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  background: var(--deep-2);
}

.page-about .about-credential-icon {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-credential-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--ivory);
  margin: 0 0 10px;
}

.page-about .about-credential-card p {
  font-size: 0.9rem;
  color: rgba(248, 244, 236, 0.8);
  margin: 0;
}

/* ===== 04 合作生态 ===== */
.page-about .about-eco-section {
  padding: 64px 0;
  background: var(--ivory);
}

.page-about .about-eco-figure {
  margin-bottom: 24px;
}

.page-about .about-eco-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-eco-card {
  background: var(--ivory);
  border: 3px solid var(--deep);
  box-shadow: var(--shadow-hard);
  padding: 24px 20px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
}

.page-about .about-eco-card:hover {
  transform: translateX(-4px) translateY(-4px);
  box-shadow: 12px 12px 0 rgba(11, 27, 58, 0.2);
}

.page-about .about-eco-symbol {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--deep);
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.page-about .about-eco-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--deep);
  margin-bottom: 6px;
}

.page-about .about-eco-card p {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--deep);
  margin-bottom: 8px;
}

.page-about .about-eco-hint {
  font-size: 0.85rem;
  color: var(--slate);
  display: block;
}

.page-about .about-eco-total {
  margin-top: 24px;
  text-align: center;
  font-size: 0.95rem;
  color: var(--slate);
}

.page-about .about-eco-total a {
  color: var(--deep-2);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--gold);
}

/* ===== 05 会员体系 ===== */
.page-about .about-membership-section {
  padding: 64px 0;
  background: var(--ivory-dark);
}

.page-about .about-membership-intro {
  max-width: 720px;
  font-size: 1rem;
  color: var(--charcoal);
  margin-bottom: 16px;
}

.page-about .about-membership-intro a {
  color: var(--deep-2);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--gold);
  transition: color 0.3s;
}

.page-about .about-membership-intro a:hover {
  color: var(--coral);
}

.page-about .about-membership-grid {
  display: grid;
  gap: 16px;
  margin: 32px 0;
}

.page-about .about-tier-card {
  background: var(--ivory);
  border: 3px solid var(--deep);
  box-shadow: var(--shadow-hard);
  padding: 24px;
  position: relative;
  transition: transform 0.3s, background 0.3s;
}

.page-about .about-tier-card:hover {
  transform: translateY(-4px);
}

.page-about .about-tier-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: var(--gold);
}

.page-about .about-tier-silver::before {
  background: #A8A8AA;
}

.page-about .about-tier-gold::before {
  background: var(--gold-light);
}

.page-about .about-tier-black::before {
  background: var(--deep-3);
}

.page-about .about-tier-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--deep);
  display: block;
  margin-bottom: 8px;
}

.page-about .about-tier-desc {
  font-size: 0.9rem;
  color: var(--charcoal);
  margin: 0;
}

.page-about .about-membership-cta {
  background: var(--deep);
  color: var(--ivory);
  padding: 28px;
  text-align: center;
  margin-top: 32px;
  border: 3px solid var(--gold);
  box-shadow: var(--shadow-hard);
}

.page-about .about-membership-cta p {
  margin-bottom: 16px;
  color: rgba(248, 244, 236, 0.85);
}

.page-about .about-membership-cta a {
  color: var(--gold-light);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(201, 168, 76, 0.5);
  transition: color 0.3s;
}

.page-about .about-membership-cta a:hover {
  color: var(--coral);
}

.page-about .about-membership-cta .btn-gold {
  text-decoration: none;
  color: var(--deep);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-membership-cta .btn-gold:hover {
  background: var(--coral);
  border-color: var(--coral);
  color: var(--ivory);
}

/* ===== 平板 600px ===== */
@media (min-width: 600px) {
  .page-about .about-hero {
    padding: 80px 0 64px;
  }

  .page-about .about-hero-stats {
    gap: 16px;
  }

  .page-about .about-stat-card {
    padding: 24px 16px;
  }

  .page-about .about-stat-num {
    font-size: 2rem;
  }

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

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

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

/* ===== 桌面 900px ===== */
@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: 3fr 2fr;
    align-items: center;
  }

  .page-about .about-story-grid {
    grid-template-columns: 1.15fr 1fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-story-figure img {
    border-width: 4px;
  }

  .page-about .about-timeline {
    margin-left: 8px;
    padding-left: 32px;
  }

  .page-about .about-timeline-card {
    padding: 24px 32px;
  }

  .page-about .about-timeline-card h3 {
    font-size: 1.3rem;
  }

  .page-about .about-timeline-card p {
    font-size: 1rem;
  }

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

  .page-about .about-credential-main {
    grid-column: span 2;
  }

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

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

  .page-about .about-tier-card {
    padding: 28px 24px;
  }
}