.page-about {
  --page-accent-gradient: linear-gradient(135deg, var(--primary) 0%, #0D3B1A 100%);
  --page-card-bg: rgba(27, 40, 56, 0.85);
  --page-timeline-color: var(--secondary);
  --page-timeline-width: 3px;
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  color: var(--text);
  background: var(--background);
  font-family: var(--font-body);
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  padding: 0 var(--gap);
}
.page-about .breadcrumb a {
  color: var(--secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .breadcrumb a:hover {
  color: var(--accent);
}
.page-about .breadcrumb .separator {
  color: var(--text-muted);
  font-size: 0.75rem;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--text);
  font-weight: 500;
}

/* ===== 杂志封面 Hero ===== */
.page-about .hero {
  position: relative;
  padding: 40px var(--gap) 48px;
  background: var(--page-accent-gradient);
  overflow: hidden;
}
.page-about .hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 60%;
  height: 140%;
  background: radial-gradient(ellipse at center, rgba(212,175,55,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: var(--content-max-width);
  margin: 0 auto;
  align-items: center;
}
.page-about .hero-text {
  position: relative;
  z-index: 1;
}
.page-about .hero-title {
  font-family: var(--font-headings);
  font-size: clamp(2.2rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--text);
  margin: 0 0 8px;
  text-transform: uppercase;
}
.page-about .hero-slogan {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--secondary);
  font-weight: 700;
  margin: 0 0 16px;
  letter-spacing: 0.04em;
}
.page-about .hero-intro {
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
  margin: 0 0 24px;
}
.page-about .hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .hero-index li {
  position: relative;
}
.page-about .hero-index a {
  color: var(--secondary-light);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}
.page-about .hero-index a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.page-about .hero-visual {
  position: relative;
  z-index: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.page-about .hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 1920 / 1080;
  max-width: 100%;
}

/* ===== 通用章节头部 ===== */
.page-about .section-header {
  max-width: var(--content-max-width);
  margin: 0 auto 40px;
  padding: 0 var(--gap);
}
.page-about .section-title {
  font-family: var(--font-headings);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
  color: var(--text);
  margin: 0 0 8px;
  letter-spacing: 0.02em;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about .section-title.light {
  color: var(--text);
}
.page-about .title-accent {
  font-family: var(--font-data);
  font-size: 0.6em;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.page-about .section-intro {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
  margin: 0;
}
.page-about .section-intro.light {
  color: rgba(255,255,255,0.8);
}

/* ===== 品牌故事 ===== */
.page-about .story-section {
  padding: 64px var(--gap) 72px;
  background: var(--surface);
  position: relative;
}
.page-about .story-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* 时间轴 */
.page-about .timeline {
  position: relative;
  padding-left: 32px;
  list-style: none;
  margin: 0;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: var(--page-timeline-width);
  background: linear-gradient(to bottom, var(--secondary), var(--accent));
  border-radius: 4px;
}
.page-about .timeline-node {
  position: relative;
  margin-bottom: 28px;
}
.page-about .timeline-node:last-child {
  margin-bottom: 0;
}
.page-about .timeline-details {
  display: block;
  background: var(--page-card-bg);
  border-radius: var(--radius);
  border-left: 3px solid var(--secondary);
  overflow: hidden;
  transition: border-color var(--transition);
}
.page-about .timeline-details[open] {
  border-left-color: var(--accent);
}
.page-about .timeline-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  padding: 16px 20px 16px 48px;
  cursor: pointer;
  list-style: none;
  position: relative;
  user-select: none;
  transition: background var(--transition);
}
.page-about .timeline-summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline-summary:hover {
  background: rgba(212,175,55,0.08);
}
.page-about .timeline-marker {
  position: absolute;
  left: -24px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--secondary);
  border: 3px solid var(--background);
  box-shadow: 0 0 0 2px var(--secondary);
  transition: background var(--transition), box-shadow var(--transition);
}
.page-about .timeline-details[open] .timeline-marker {
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
}
.page-about .timeline-phase {
  font-family: var(--font-headings);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}
.page-about .timeline-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}
.page-about .timeline-content {
  padding: 0 20px 20px 48px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.page-about .timeline-content p {
  margin: 0;
}

/* 故事区媒体 */
.page-about .story-media {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.page-about .story-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  object-fit: cover;
  aspect-ratio: 800 / 600;
  max-width: 100%;
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.page-about .story-quote {
  background: var(--page-card-bg);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.page-about .story-quote p {
  font-family: var(--font-headings);
  font-size: 1.15rem;
  color: var(--secondary-light);
  margin: 0;
  font-style: italic;
  letter-spacing: 0.02em;
}

/* ===== 核心功能概览 ===== */
.page-about .features-section {
  padding: 64px var(--gap) 72px;
  background: var(--background);
  position: relative;
}
.page-about .features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  max-width: var(--content-max-width);
  margin: 0 auto 40px;
}
.page-about .feature-card {
  background: var(--page-card-bg);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
}
.page-about .feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(212,175,55,0.12);
  border-color: rgba(212,175,55,0.25);
}
.page-about .feature-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--secondary);
  border-radius: 0 2px 2px 0;
  transition: background var(--transition);
}
.page-about .feature-card:hover::after {
  background: var(--accent);
}
.page-about .card-icon {
  color: var(--secondary);
  margin-bottom: 16px;
  width: 40px;
  height: 40px;
  transition: color var(--transition);
}
.page-about .feature-card:hover .card-icon {
  color: var(--accent);
}
.page-about .card-title {
  font-family: var(--font-headings);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}
.page-about .card-brief {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0 0 4px;
}
.page-about .card-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
  opacity: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.page-about .feature-card:hover .card-detail {
  max-height: 120px;
  opacity: 1;
}
.page-about .card-detail p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--divider);
}
.page-about .feature-card-tall {
  grid-row: span 1;
}
.page-about .feature-card-wide {
  grid-column: span 1;
}
.page-about .features-cta {
  text-align: center;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
}
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  border-radius: var(--radius);
  font-family: var(--font-headings);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}
.page-about .btn-accent {
  background: var(--accent);
  color: var(--text);
}
.page-about .btn-accent:hover {
  background: var(--accent-light);
  transform: scale(1.03);
}
.page-about .btn-primary {
  background: var(--primary);
  color: var(--text);
}
.page-about .btn-primary:hover {
  background: var(--primary-light);
  transform: scale(1.03);
}
.page-about .btn-secondary {
  background: transparent;
  color: var(--secondary);
  border: 2px solid var(--secondary);
}
.page-about .btn-secondary:hover {
  background: var(--secondary);
  color: var(--background);
  transform: scale(1.03);
}

/* ===== 数据安全与稳定 ===== */
.page-about .trust-section {
  padding: 64px var(--gap) 72px;
  background: var(--page-accent-gradient);
  position: relative;
  overflow: hidden;
}
.page-about .trust-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(45deg, rgba(212,175,55,0.03) 0px, rgba(212,175,55,0.03) 20px, transparent 20px, transparent 40px);
  pointer-events: none;
}
.page-about .trust-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  position: relative;
  z-index: 1;
}
.page-about .trust-text {
  order: 1;
}
.page-about .trust-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .trust-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
  line-height: 1.6;
  padding: 16px 20px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
}
.page-about .trust-item strong {
  color: var(--text);
  font-weight: 700;
}
.page-about .trust-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--secondary);
  color: var(--background);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 2px;
}
.page-about .trust-visual {
  order: 2;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .trust-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.page-about .stat-block {
  text-align: center;
  padding: 24px 16px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(212,175,55,0.2);
}
.page-about .stat-figure {
  display: block;
  font-family: var(--font-data);
  font-size: 3rem;
  font-weight: 900;
  color: var(--secondary);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.page-about .stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ===== 用户承诺 ===== */
.page-about .commit-section {
  padding: 64px var(--gap) 72px;
  background: var(--surface);
}
.page-about .commit-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  text-align: center;
}
.page-about .commit-text {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 720px;
  margin: 16px auto 36px;
}
.page-about .commit-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* ===== 桌面端 (min-width: 768px) ===== */
@media (min-width: 768px) {
  .page-about .hero {
    padding: 56px var(--gap) 64px;
  }
  .page-about .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
  .page-about .hero-title {
    font-size: clamp(2.8rem, 5vw, 4.5rem);
  }
  .page-about .hero-visual {
    order: 2;
  }
  .page-about .story-layout {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }
  .page-about .timeline {
    padding-left: 40px;
  }
  .page-about .timeline::before {
    left: 12px;
  }
  .page-about .timeline-marker {
    left: -28px;
    width: 18px;
    height: 18px;
  }
  .page-about .features-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .feature-card-tall {
    grid-row: span 2;
  }
  .page-about .feature-card-wide {
    grid-column: span 2;
  }
  .page-about .trust-inner {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }
  .page-about .trust-text {
    order: 0;
  }
  .page-about .trust-visual {
    order: 1;
  }
  .page-about .trust-list {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .trust-stats {
    gap: 32px;
  }
  .page-about .stat-figure {
    font-size: 3.8rem;
  }
  .page-about .commit-links {
    gap: 20px;
  }
}

/* ===== 桌面端 (min-width: 1024px) ===== */
@media (min-width: 1024px) {
  .page-about .hero {
    padding: 72px var(--gap) 80px;
  }
  .page-about .hero-grid {
    gap: 64px;
  }
  .page-about .features-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .page-about .feature-card-tall {
    grid-row: span 2;
  }
  .page-about .feature-card-wide {
    grid-column: span 1;
  }
  .page-about .trust-list {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .stat-figure {
    font-size: 4.2rem;
  }
}

/* ===== 大桌面 (min-width: 1280px) ===== */
@media (min-width: 1280px) {
  .page-about .features-grid {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
  .page-about .feature-card-tall {
    grid-row: span 2;
  }
  .page-about .feature-card-wide {
    grid-column: span 2;
  }
}