/* ===== 品牌档案页面专属样式 ===== */
.page-about {
  --color-primary: #0A1F3F;
  --color-accent: #FFD700;
  --color-green: #00E676;
  --color-green-dark: #00BFA5;
  --color-accent-soft: #FFC107;
  --color-bg-light: #F5F7FA;
  --color-text-dark: #2C3E50;
  --color-white: #FFFFFF;
  --gradient-hero: linear-gradient(135deg, #0A1F3F, #004D9A);
  --font-heading: Impact, 'Arial Black', sans-serif;
  --font-body: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
  --radius-capsule: 50px;
  --radius-card: 12px;
  --shadow-island: 0 8px 32px rgba(10, 31, 63, 0.35);
  --shadow-card: 0 4px 16px rgba(10, 31, 63, 0.12);
  --transition: 0.3s ease;

  display: block;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  padding: 0 16px 48px;
  box-sizing: border-box;
  font-family: var(--font-body);
  color: var(--color-text-dark);
  background: var(--color-bg-light);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 16px 0 8px;
  font-size: 14px;
  color: var(--color-text-dark);
  opacity: 0.75;
  max-width: var(--max-width);
  margin: 0 auto;
}
.page-about .breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  transition: opacity var(--transition);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus {
  opacity: 0.7;
  text-decoration: underline;
}
.page-about .breadcrumb .sep {
  color: var(--color-accent);
  font-weight: 700;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 24px 0 36px;
  max-width: var(--max-width);
  margin: 0 auto;
  background: var(--gradient-hero);
  border-radius: var(--radius-card);
  padding: 32px 24px;
  margin-bottom: 32px;
  position: relative;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,215,0,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.page-about .hero-heading {
  font-family: var(--font-heading);
  font-size: 42px;
  line-height: 1.1;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: -0.02em;
  text-shadow: 2px 2px 0 rgba(0,0,0,0.25);
  margin: 0 0 8px;
}
.page-about .hero-sub {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-white);
  opacity: 0.9;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.page-about .hero-desc {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-white);
  opacity: 0.85;
  margin: 0 0 20px;
  max-width: 520px;
}
.page-about .num-highlight {
  color: var(--color-accent);
  font-weight: 800;
  font-size: 1.15em;
}
.page-about .hero-cta {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-primary);
  font-weight: 700;
  padding: 10px 28px;
  border-radius: var(--radius-capsule);
  text-decoration: none;
  font-size: 16px;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 12px rgba(255,215,0,0.35);
}
.page-about .hero-cta:hover,
.page-about .hero-cta:focus {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255,215,0,0.5);
}
.page-about .hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .hero-img-box {
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  background: rgba(255,255,255,0.05);
}
.page-about .hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 350px;
  object-fit: cover;
  object-position: center;
}

/* ===== 杂志化两栏布局 ===== */
.page-about .about-layout {
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* 侧边栏 */
.page-about .content-sidebar {
  width: 100%;
}
.page-about .sidebar-sticky {
  background: var(--color-white);
  border-radius: var(--radius-card);
  padding: 20px 20px 16px;
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-accent);
}
.page-about .sidebar-title {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--color-primary);
  margin: 0 0 12px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.page-about .toc-list {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.page-about .toc-link {
  display: block;
  padding: 6px 14px;
  color: var(--color-text-dark);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  border-radius: 20px;
  background: var(--color-bg-light);
  transition: background var(--transition), color var(--transition);
}
.page-about .toc-link:hover,
.page-about .toc-link:focus {
  background: var(--color-primary);
  color: var(--color-white);
}
.page-about .sidebar-note {
  padding-top: 12px;
  border-top: 1px solid rgba(10,31,63,0.08);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .sidebar-note .small-text {
  font-size: 13px;
  color: var(--color-text-dark);
  opacity: 0.7;
  margin: 0;
  line-height: 1.4;
}
/* tag 共用 */
.page-about .tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.page-about .tag-green {
  background: var(--color-green);
  color: var(--color-primary);
}
.page-about .tag-outline {
  background: transparent;
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
  opacity: 0.7;
}

/* ===== 主内容区 ===== */
.page-about .content-main {
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.page-about .content-section {
  background: var(--color-white);
  border-radius: var(--radius-card);
  padding: 28px 20px;
  box-shadow: var(--shadow-card);
  position: relative;
}
.page-about .section-intro {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}
.page-about .section-number {
  font-family: var(--font-heading);
  font-size: 28px;
  color: var(--color-accent);
  opacity: 0.6;
  line-height: 1;
}
.page-about .section-heading {
  font-family: var(--font-heading);
  font-size: 28px;
  color: var(--color-primary);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.page-about .section-guide {
  font-size: 16px;
  font-style: italic;
  color: var(--color-text-dark);
  opacity: 0.7;
  margin: 0 0 20px;
  padding-left: 38px;
  border-left: 3px solid var(--color-accent);
  line-height: 1.5;
}

/* 品牌故事正文 */
.page-about .intro-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-about .body-text {
  font-size: 16px;
  line-height: 1.7;
  margin: 0;
  color: var(--color-text-dark);
}
.page-about .callout {
  display: flex;
  gap: 12px;
  padding: 16px 18px;
  border-radius: var(--radius-card);
  background: var(--color-bg-light);
  border-left: 4px solid var(--color-accent);
  margin: 4px 0;
}
.page-about .callout-accent {
  background: rgba(255,215,0,0.08);
  border-left-color: var(--color-accent);
}
.page-about .callout-icon {
  font-size: 24px;
  flex-shrink: 0;
  margin-top: 2px;
}
.page-about .callout-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-dark);
}
.page-about .callout-text strong {
  color: var(--color-primary);
}

/* ===== 服务卡片网格 ===== */
.page-about .service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 8px;
}
.page-about .service-card-wrap {
  perspective: 1000px;
}
.page-about .service-card {
  display: block;
  cursor: pointer;
  border-radius: var(--radius-card);
  background: transparent;
  transition: transform var(--transition);
}
.page-about .card-inner {
  position: relative;
  width: 100%;
  min-height: 180px;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
}
.page-about .card-front,
.page-about .card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-card);
  padding: 20px 16px;
  box-sizing: border-box;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-card);
  background: var(--color-white);
}
.page-about .card-back {
  transform: rotateY(180deg);
  background: var(--color-primary);
  color: var(--color-white);
  justify-content: center;
  gap: 8px;
}
.page-about .card-toggle:checked + .service-card .card-inner {
  transform: rotateY(180deg);
}
.page-about .card-toggle:focus-visible + .service-card .card-front {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}
.page-about .card-icon-box {
  width: 64px;
  height: 64px;
  margin-bottom: 10px;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .card-icon {
  display: block;
  width: 64px;
  height: 64px;
  object-fit: cover;
}
.page-about .card-title {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--color-primary);
  margin: 0 0 4px;
  text-transform: uppercase;
}
.page-about .card-brief {
  font-size: 14px;
  color: var(--color-text-dark);
  opacity: 0.7;
  margin: 0;
}
.page-about .card-detail {
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
  color: var(--color-white);
  opacity: 0.92;
}
.page-about .card-hint {
  font-size: 12px;
  color: var(--color-accent);
  opacity: 0.7;
  margin-top: 4px;
}
.page-about .card-back .card-detail {
  color: var(--color-white);
}

/* ===== 时间轴 ===== */
.page-about .timeline-wrap {
  position: relative;
  padding-left: 24px;
  margin-top: 8px;
}
.page-about .timeline-line {
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-green));
  border-radius: 4px;
}
.page-about .timeline-node {
  position: relative;
  margin-bottom: 20px;
  padding-left: 20px;
}
.page-about .node-marker {
  position: absolute;
  left: -20px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent);
  z-index: 1;
}
.page-about .node-marker.marker-current {
  background: var(--color-green);
  box-shadow: 0 0 0 2px var(--color-green), 0 0 0 6px rgba(0,230,118,0.2);
}
.page-about .node-details {
  display: block;
  background: var(--color-bg-light);
  border-radius: var(--radius-card);
  overflow: hidden;
  border-left: 3px solid var(--color-accent);
}
.page-about .node-details[open] {
  border-left-color: var(--color-green);
}
.page-about .node-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  transition: background var(--transition);
}
.page-about .node-summary::-webkit-details-marker {
  display: none;
}
.page-about .node-summary::before {
  content: '▶';
  font-size: 12px;
  color: var(--color-accent);
  transition: transform var(--transition);
}
.page-about .node-details[open] .node-summary::before {
  transform: rotate(90deg);
}
.page-about .node-summary:hover,
.page-about .node-summary:focus {
  background: rgba(255,215,0,0.06);
}
.page-about .node-version {
  font-family: var(--font-heading);
  font-size: 16px;
  letter-spacing: 0.02em;
}
.page-about .node-status {
  font-size: 11px;
  padding: 2px 8px;
}
.page-about .node-body {
  padding: 0 16px 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-dark);
}
.page-about .node-body p {
  margin: 0 0 12px;
}
.page-about .node-img-box {
  max-width: 300px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-white);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.page-about .node-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 200px;
  object-fit: cover;
}

/* ===== 联系我们 ===== */
.page-about .contact-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 8px 0 20px;
}
.page-about .contact-card {
  background: var(--color-bg-light);
  border-radius: var(--radius-card);
  padding: 20px 18px;
  text-align: center;
  border: 1px solid rgba(10,31,63,0.06);
  transition: box-shadow var(--transition), transform var(--transition);
}
.page-about .contact-card:hover {
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}
.page-about .contact-icon {
  font-size: 32px;
  display: block;
  margin-bottom: 8px;
}
.page-about .contact-label {
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--color-primary);
  margin: 0 0 6px;
  text-transform: uppercase;
}
.page-about .contact-value {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-dark);
  word-break: break-all;
  margin-bottom: 6px;
}
.page-about .contact-card a.contact-value {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .contact-card a.contact-value:hover {
  color: var(--color-accent);
}
.page-about .contact-note {
  font-size: 13px;
  color: var(--color-text-dark);
  opacity: 0.65;
  margin: 0;
  line-height: 1.5;
}
.page-about .contact-cta-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
  background: var(--color-primary);
  border-radius: var(--radius-card);
  text-align: center;
}
.page-about .cta-box-text {
  font-size: 16px;
  color: var(--color-white);
  margin: 0;
  opacity: 0.9;
}
.page-about .btn-outline {
  display: inline-block;
  padding: 10px 28px;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  background: transparent;
  border-radius: var(--radius-capsule);
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  transition: background var(--transition), color var(--transition);
}
.page-about .btn-outline:hover,
.page-about .btn-outline:focus {
  background: var(--color-accent);
  color: var(--color-primary);
}

/* ===== 桌面端 ≥768px ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 0 32px 64px;
  }
  .page-about .about-hero {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 48px 40px;
    gap: 40px;
  }
  .page-about .hero-heading {
    font-size: 56px;
  }
  .page-about .hero-sub {
    font-size: 18px;
  }
  .page-about .hero-desc {
    font-size: 16px;
  }
  .page-about .hero-visual {
    flex-shrink: 0;
    width: 45%;
    max-width: 500px;
  }
  .page-about .about-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 36px;
  }
  .page-about .content-sidebar {
    width: 240px;
    flex-shrink: 0;
  }
  .page-about .sidebar-sticky {
    position: sticky;
    top: calc(var(--header-height) + 20px);
  }
  .page-about .toc-list {
    flex-direction: column;
    gap: 4px;
  }
  .page-about .toc-link {
    padding: 8px 16px;
    font-size: 15px;
  }
  .page-about .content-main {
    flex: 1;
    min-width: 0;
  }
  .page-about .content-section {
    padding: 36px 32px;
  }
  .page-about .section-number {
    font-size: 36px;
  }
  .page-about .section-heading {
    font-size: 32px;
  }
  .page-about .service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .card-inner {
    min-height: 200px;
  }
  .page-about .timeline-wrap {
    padding-left: 32px;
  }
  .page-about .contact-card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .contact-cta-box {
    flex-direction: row;
    justify-content: space-between;
    padding: 24px 32px;
  }
  .page-about .cta-box-text {
    font-size: 17px;
  }
}

/* ===== 大桌面端 ≥1024px ===== */
@media (min-width: 1024px) {
  .page-about .hero-heading {
    font-size: 64px;
  }
  .page-about .content-sidebar {
    width: 260px;
  }
  .page-about .content-section {
    padding: 44px 40px;
  }
  .page-about .service-grid {
    grid-template-columns: repeat(5, 1fr);
  }
  .page-about .card-inner {
    min-height: 220px;
  }
}