/* ===== 品牌档案页面专属样式 ===== */
.page-about {
  --bg-soft-start: #e6eefb;
  --bg-soft-end: #f2f6fd;
  --sidebar-bg: rgba(255, 255, 255, 0.75);
  --sidebar-border: rgba(10, 25, 47, 0.08);
  --card-bg-local: rgba(255, 255, 255, 0.85);
  --card-shadow: 0 4px 20px rgba(10, 25, 47, 0.06);
  --accent-soft-local: rgba(255, 107, 53, 0.08);
  --quote-color: #0a192f;
  --stat-track-bg: rgba(10, 25, 47, 0.08);
  --stat-fill-bg: #ff6b35;
  --detail-bg: rgba(10, 25, 47, 0.03);

  background: linear-gradient(145deg, var(--bg-soft-start) 0%, var(--bg-soft-end) 100%);
  min-height: 100vh;
}

/* ===== 布局容器 ===== */
.about-layout {
  display: flex;
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  gap: 2.5rem;
  align-items: flex-start;
}

/* ===== 左侧边栏 ===== */
.about-sidebar {
  width: 240px;
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-h, 72px) + 2rem);
  background: var(--sidebar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-lg, 24px);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-soft, 0 8px 32px rgba(0, 0, 0, 0.3));
  height: fit-content;
  max-height: calc(100vh - var(--header-h, 72px) - 4rem);
  overflow-y: auto;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-brand-icon {
  font-size: 1.25rem;
  color: var(--accent, #ff6b35);
  line-height: 1;
}

.sidebar-brand-name {
  font-family: var(--font-head, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--primary, #0a192f);
  letter-spacing: 0.02em;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  margin-bottom: 1.5rem;
}

.sidebar-link {
  display: block;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--primary, #0a192f);
  text-decoration: none;
  border-radius: var(--radius-sm, 8px);
  transition: background var(--transition, 0.3s), color var(--transition, 0.3s);
  line-height: 1.4;
}

.sidebar-link:hover,
.sidebar-link:focus-visible {
  background: var(--accent-soft-local);
  color: var(--accent, #ff6b35);
}

.sidebar-link:focus-visible {
  outline: 2px solid var(--accent, #ff6b35);
  outline-offset: 2px;
}

.sidebar-footnote {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  color: var(--gray, #8a8d93);
  text-align: center;
  padding-top: 0.75rem;
  border-top: 1px solid var(--sidebar-border);
  letter-spacing: 0.04em;
}

/* ===== 右侧内容区 ===== */
.about-content {
  flex: 1;
  min-width: 0;
  padding-top: 0.25rem;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  color: var(--gray, #8a8d93);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--gray, #8a8d93);
  text-decoration: none;
  transition: color var(--transition, 0.3s);
}

.breadcrumb a:hover {
  color: var(--accent, #ff6b35);
}

.breadcrumb-sep {
  color: var(--gray-light, #b0b3b9);
}

.breadcrumb [aria-current="page"] {
  color: var(--primary, #0a192f);
  font-weight: 600;
}

/* ===== 页面主标题 ===== */
.about-h1 {
  font-family: var(--font-head, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 2.8rem;
  color: var(--primary, #0a192f);
  margin: 0 0 2.5rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* ===== 通用章节 ===== */
.content-section {
  margin-bottom: 4rem;
}

.section-h2 {
  font-family: var(--font-head, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--primary, #0a192f);
  margin: 0 0 1.25rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* ===== 使命与理念 ===== */
.mission-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.mission-text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mission-quote {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-weight: 300;
  font-size: 2rem;
  line-height: 1.3;
  color: var(--quote-color);
  margin: 0;
  padding: 1rem 0 0.5rem;
  border-top: 3px solid var(--accent, #ff6b35);
  letter-spacing: 0.02em;
  font-style: normal;
}

.mission-desc {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--primary, #0a192f);
  margin: 0;
}

.mission-desc strong {
  font-weight: 600;
  color: var(--accent, #ff6b35);
}

.content-link {
  color: var(--accent, #ff6b35);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  font-weight: 500;
  transition: color var(--transition, 0.3s);
}

.content-link:hover {
  color: var(--accent-hover, #e85a2a);
  text-decoration-thickness: 2px;
}

.mission-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md, 16px);
  box-shadow: var(--shadow-soft, 0 8px 32px rgba(0, 0, 0, 0.3));
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

/* ===== 数据来源与覆盖 ===== */
.data-intro {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--primary, #0a192f);
  margin: 0 0 1.75rem;
}

.data-intro strong {
  font-weight: 600;
  color: var(--accent, #ff6b35);
}

.data-stats {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.data-stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.stat-label {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary, #0a192f);
  letter-spacing: 0.03em;
}

.stat-bar-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stat-bar-track {
  flex: 1;
  height: 8px;
  background: var(--stat-track-bg);
  border-radius: var(--radius-full, 100px);
  overflow: hidden;
}

.stat-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent, #ff6b35), #ff8a5c);
  border-radius: var(--radius-full, 100px);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-bar-text {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent, #ff6b35);
  min-width: 4.5rem;
  text-align: right;
}

.stat-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.15rem;
}

.stat-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.78rem;
  color: var(--primary, #0a192f);
  background: var(--accent-soft-local);
  border-radius: var(--radius-full, 100px);
  letter-spacing: 0.02em;
}

.data-note {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--gray, #8a8d93);
  margin: 1rem 0 0;
  padding: 0.75rem 1rem;
  background: var(--card-bg-local);
  border-radius: var(--radius-sm, 8px);
  border-left: 3px solid var(--accent, #ff6b35);
}

/* ===== 核心功能速览 ===== */
.features-intro {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray, #8a8d93);
  margin: 0 0 1.75rem;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.feature-card {
  background: var(--card-bg-local);
  border-radius: var(--radius-md, 16px);
  box-shadow: var(--card-shadow);
  border: 1px solid transparent;
  transition: border-color var(--transition, 0.3s), box-shadow var(--transition, 0.3s);
  overflow: hidden;
  display: block;
}

.feature-card[open] {
  border-color: var(--accent-soft, rgba(255, 107, 53, 0.15));
  box-shadow: 0 6px 28px rgba(10, 25, 47, 0.1);
}

.feature-card[open] .feature-expand-icon {
  transform: rotate(45deg);
}

.feature-summary {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.25rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.feature-summary::-webkit-details-marker {
  display: none;
}

.feature-summary:focus-visible {
  outline: 2px solid var(--accent, #ff6b35);
  outline-offset: -2px;
  border-radius: var(--radius-md, 16px);
}

.feature-icon {
  width: 60px;
  height: 60px;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm, 8px);
  object-fit: cover;
  flex-shrink: 0;
  background: var(--accent-soft-local);
}

.feature-summary-text {
  flex: 1;
  min-width: 0;
}

.feature-title {
  font-family: var(--font-head, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary, #0a192f);
  margin: 0 0 0.15rem;
  line-height: 1.3;
}

.feature-brief {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.85rem;
  color: var(--gray, #8a8d93);
  margin: 0;
  line-height: 1.4;
}

.feature-expand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-family: var(--font-head, 'Poppins', sans-serif);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--accent, #ff6b35);
  background: var(--accent-soft-local);
  border-radius: 50%;
  flex-shrink: 0;
  transition: transform var(--transition, 0.3s);
  line-height: 1;
}

.feature-detail {
  padding: 0 1.25rem 1.25rem;
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--primary, #0a192f);
  background: var(--detail-bg);
  border-top: 1px solid var(--sidebar-border);
  margin-top: 0;
}

.feature-detail p {
  margin: 0.75rem 0 0;
}

.feature-detail strong {
  font-weight: 600;
  color: var(--accent, #ff6b35);
}

/* ===== 联系方式 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  align-items: start;
}

.contact-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.contact-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md, 16px);
  box-shadow: var(--card-shadow);
  object-fit: cover;
  aspect-ratio: 16 / 10;
  width: 100%;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-desc {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--primary, #0a192f);
  margin: 0;
}

.contact-desc strong {
  font-weight: 600;
  color: var(--accent, #ff6b35);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: var(--card-bg-local);
  border-radius: var(--radius-sm, 8px);
  border-left: 3px solid var(--accent, #ff6b35);
}

.contact-label {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gray, #8a8d93);
  min-width: 3.2rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact-value {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.95rem;
  color: var(--primary, #0a192f);
  word-break: break-word;
}

a.contact-value {
  color: var(--accent, #ff6b35);
  text-decoration: none;
  transition: color var(--transition, 0.3s);
}

a.contact-value:hover {
  color: var(--accent-hover, #e85a2a);
  text-decoration: underline;
}

.contact-note {
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.9rem;
  color: var(--gray, #8a8d93);
  margin: 0.5rem 0 0;
}

.contact-note a {
  color: var(--accent, #ff6b35);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.contact-note a:hover {
  color: var(--accent-hover, #e85a2a);
}

/* ===== 响应式：移动端 ===== */
@media (max-width: 991px) {
  .about-layout {
    flex-direction: column;
    padding: 1rem 1rem 2rem;
    gap: 1.5rem;
  }

  .about-sidebar {
    width: 100%;
    position: static;
    max-height: none;
    padding: 1rem 1.25rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md, 16px);
  }

  .sidebar-brand {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
    margin-right: 0.5rem;
    flex-shrink: 0;
  }

  .sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
    margin-bottom: 0;
    gap: 0.25rem;
    flex: 1;
  }

  .sidebar-link {
    padding: 0.35rem 0.7rem;
    font-size: 0.82rem;
    white-space: nowrap;
    background: var(--accent-soft-local);
    border-radius: var(--radius-full, 100px);
  }

  .sidebar-footnote {
    display: none;
  }

  .about-h1 {
    font-size: 2rem;
    margin-bottom: 1.75rem;
  }

  .mission-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .mission-quote {
    font-size: 1.5rem;
  }

  .mission-image {
    order: -1;
  }

  .hero-img {
    max-width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feature-summary {
    padding: 1rem 1rem 0.75rem;
  }

  .feature-icon {
    width: 48px;
    height: 48px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .contact-image {
    order: -1;
  }

  .section-h2 {
    font-size: 1.35rem;
  }

  .content-section {
    margin-bottom: 2.5rem;
  }
}

@media (max-width: 480px) {
  .about-h1 {
    font-size: 1.6rem;
  }

  .mission-quote {
    font-size: 1.25rem;
  }

  .sidebar-brand-name {
    font-size: 0.9rem;
  }

  .sidebar-link {
    font-size: 0.75rem;
    padding: 0.25rem 0.55rem;
  }

  .contact-item {
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
  }

  .contact-label {
    min-width: auto;
  }
}