/* ===== 页面专属：品牌档案 ===== */
.page-about {
  --about-gold-line: linear-gradient(90deg, transparent 0%, var(--clr-primary-gold) 30%, var(--clr-primary-gold) 70%, transparent 100%);
  --about-diagonal: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  --about-card-bg: rgba(10, 46, 26, 0.55);
  --about-glass-border: 1px solid rgba(212, 175, 55, 0.25);

  display: flex;
  flex-direction: column;
  gap: 0;
  background-color: var(--clr-background-black);
  color: var(--clr-text-white);
  font-family: var(--font-body);
  line-height: 1.6;
  padding: 0;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem 0;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--clr-text-muted);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.page-about .breadcrumb a {
  color: var(--clr-link-gold);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--clr-primary-gold);
  text-decoration: underline;
}
.page-about .breadcrumb-sep {
  color: var(--clr-primary-gold);
  font-size: 0.5rem;
  opacity: 0.6;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--clr-text-white);
  font-weight: 500;
}

/* 面板通用标题区 */
.page-about .panel-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-primary-gold);
  letter-spacing: 0.05em;
  line-height: 1;
}
.page-about .section-line {
  flex: 1;
  height: 1px;
  background: var(--about-gold-line);
  max-width: 120px;
}
.page-about .section-heading {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  color: var(--clr-text-white);
  letter-spacing: 0.02em;
  margin: 0 0 1.25rem;
  line-height: 1.15;
}

/* ===== 首屏 ===== */
.page-about .panel-hero {
  position: relative;
  padding: 2.5rem 1.25rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.page-about .hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  max-width: 720px;
}
.page-about .hero-emblem {
  position: relative;
  width: 140px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .hero-logo {
  width: 100%;
  height: auto;
  max-width: 200px;
  object-fit: contain;
  filter: drop-shadow(0 0 20px rgba(212, 175, 55, 0.3));
}
.page-about .hero-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 7vw, 3.75rem);
  line-height: 1.1;
  color: var(--clr-text-white);
  margin: 0;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}
.page-about .hero-mission {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--clr-text-muted);
  max-width: 560px;
  margin: 0;
  font-weight: 400;
  line-height: 1.6;
}
.page-about .hero-divider {
  width: 80%;
  max-width: 400px;
  height: 2px;
  background: var(--about-gold-line);
  margin-top: 1rem;
  border-radius: 2px;
  opacity: 0.7;
}

/* ===== 品牌理念 ===== */
.page-about .panel-mission {
  padding: 2.5rem 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.page-about .mission-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .mission-text {
  flex: 1;
}
.page-about .mission-desc {
  font-size: 1rem;
  color: var(--clr-text-white);
  margin: 0 0 1rem;
  line-height: 1.7;
  opacity: 0.9;
}
.page-about .mission-cta {
  display: inline-flex;
  align-items: center;
  margin-top: 0.5rem;
}
.page-about .mission-stat {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
}
.page-about .stat-card {
  background: var(--about-card-bg);
  border: var(--about-glass-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  text-align: center;
  min-width: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.page-about .stat-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  color: var(--clr-primary-gold);
  line-height: 1;
}
.page-about .stat-caption {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ===== 服务内容（标签页） ===== */
.page-about .panel-services {
  padding: 2.5rem 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.page-about .tabs-container {
  margin-top: 0.5rem;
}
.page-about .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}
.page-about .tab-btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  background: transparent;
  border: none;
  border-radius: 6px 6px 0 0;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.25s, background 0.25s, box-shadow 0.25s;
  position: relative;
  white-space: nowrap;
}
.page-about .tab-btn:hover,
.page-about .tab-btn:focus-visible {
  color: var(--clr-primary-gold);
  background: rgba(212, 175, 55, 0.08);
  outline: none;
}
.page-about .tab-btn[aria-selected="true"] {
  color: var(--clr-primary-gold);
  background: rgba(212, 175, 55, 0.12);
  box-shadow: inset 0 -2px 0 var(--clr-primary-gold);
}
/* :target 高亮辅助（无JS后备） */
.page-about .tab-btn:focus-within {
  color: var(--clr-primary-gold);
}

.page-about .tab-panels {
  position: relative;
  min-height: 180px;
}
.page-about .tab-panel {
  display: none;
  animation: tabFadeIn 0.35s ease-out;
}
.page-about .tab-panel:target {
  display: block;
}
/* 没有 :target 时显示第一个面板（利用 :has 在不支持时退化为 first-child） */
.page-about .tab-panels:not(:has(.tab-panel:target)) .tab-panel:first-child {
  display: block;
}
/* 有 :target 时隐藏非目标面板 */
.page-about .tab-panels:has(.tab-panel:target) .tab-panel:not(:target) {
  display: none;
}

@keyframes tabFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-about .tab-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}
.page-about .tab-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid rgba(212, 175, 55, 0.15);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}
.page-about .tab-text {
  flex: 1;
}
.page-about .tab-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--clr-primary-gold);
  margin: 0 0 0.75rem;
  line-height: 1.2;
}
.page-about .tab-text p {
  font-size: 0.95rem;
  color: var(--clr-text-white);
  line-height: 1.7;
  margin: 0 0 1rem;
  opacity: 0.88;
}
.page-about .tab-link {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
}

/* ===== 数据准则 ===== */
.page-about .panel-standards {
  padding: 2.5rem 1.25rem 3.5rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.page-about .standards-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .standards-text {
  flex: 1;
}
.page-about .standards-intro {
  font-size: 1rem;
  color: var(--clr-text-muted);
  margin: 0 0 1.5rem;
  line-height: 1.6;
}
.page-about .standards-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.page-about .standards-item {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.75rem 1rem;
  background: var(--about-card-bg);
  border: var(--about-glass-border);
  border-radius: 8px;
  transition: background 0.25s, border-color 0.25s;
}
.page-about .standards-item:hover {
  background: rgba(10, 46, 26, 0.75);
  border-color: rgba(212, 175, 55, 0.45);
}
.page-about .standards-icon {
  font-size: 0.8rem;
  color: var(--clr-primary-gold);
  flex: 0 0 auto;
  margin-top: 0.3rem;
  opacity: 0.8;
}
.page-about .standards-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--clr-text-white);
  display: block;
  margin-bottom: 0.2rem;
}
.page-about .standards-desc {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  margin: 0;
  line-height: 1.5;
}
.page-about .standards-cta {
  display: inline-flex;
  align-items: center;
  margin-top: 0.25rem;
}
.page-about .standards-visual {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .standards-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid rgba(212, 175, 55, 0.15);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

/* ===== 按钮统一样式（页面专属微调） ===== */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.6rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.25s, color 0.25s, box-shadow 0.25s, border-color 0.25s;
  cursor: pointer;
  border: 2px solid transparent;
}
.page-about .btn-primary {
  background: var(--clr-primary-gold);
  color: var(--clr-background-black);
  border-color: var(--clr-primary-gold);
}
.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: #e6c200;
  border-color: #e6c200;
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.35);
  color: var(--clr-background-black);
}
.page-about .btn-outline {
  background: transparent;
  color: var(--clr-primary-gold);
  border-color: var(--clr-primary-gold);
}
.page-about .btn-outline:hover,
.page-about .btn-outline:focus-visible {
  background: rgba(212, 175, 55, 0.12);
  box-shadow: 0 0 16px rgba(212, 175, 55, 0.2);
  color: var(--clr-primary-gold);
}

/* ===== 滚动显现动画 ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.23, 1, 0.32, 1), transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}
.page-about [data-reveal-visible="true"] {
  opacity: 1;
  transform: translateY(0);
}
.page-about [data-reveal-delay="100"] { transition-delay: 0.1s; }
.page-about [data-reveal-delay="150"] { transition-delay: 0.15s; }
.page-about [data-reveal-delay="200"] { transition-delay: 0.2s; }
.page-about [data-reveal-delay="300"] { transition-delay: 0.3s; }
.page-about [data-reveal-delay="450"] { transition-delay: 0.45s; }

/* ===== 桌面端 ≥768px ===== */
@media (min-width: 768px) {
  .page-about .breadcrumb {
    padding: 1.25rem 2rem 0;
  }

  .page-about .panel-hero {
    padding: 3.5rem 2rem 4rem;
  }
  .page-about .hero-emblem {
    width: 180px;
    height: 180px;
  }

  .page-about .panel-mission {
    padding: 3rem 2rem;
  }
  .page-about .mission-layout {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about .mission-text {
    flex: 1.2;
  }
  .page-about .mission-stat {
    flex: 0 0 auto;
  }
  .page-about .stat-card {
    min-width: 200px;
    padding: 2rem 2.5rem;
  }
  .page-about .stat-number {
    font-size: 3.5rem;
  }

  .page-about .panel-services {
    padding: 3rem 2rem;
  }
  .page-about .tab-list {
    gap: 0.75rem;
    padding-bottom: 0.75rem;
    margin-bottom: 2rem;
  }
  .page-about .tab-btn {
    font-size: 1rem;
    padding: 0.7rem 1.5rem;
  }
  .page-about .tab-grid {
    flex-direction: row;
    align-items: center;
    gap: 2.5rem;
  }
  .page-about .tab-img {
    width: 50%;
    max-width: 480px;
    flex-shrink: 0;
  }

  .page-about .panel-standards {
    padding: 3rem 2rem 4rem;
  }
  .page-about .standards-layout {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about .standards-text {
    flex: 1.1;
  }
  .page-about .standards-visual {
    flex: 0 0 auto;
  }
  .page-about .standards-img {
    max-width: 380px;
  }
}

/* ===== 大桌面端 ≥1024px ===== */
@media (min-width: 1024px) {
  .page-about .panel-hero {
    padding: 4rem 2rem 5rem;
  }
  .page-about .hero-emblem {
    width: 200px;
    height: 200px;
  }
  .page-about .panel-mission {
    padding: 4rem 2rem;
  }
  .page-about .panel-services {
    padding: 4rem 2rem;
  }
  .page-about .panel-standards {
    padding: 4rem 2rem 5rem;
  }
  .page-about .section-heading {
    font-size: 2.75rem;
  }
  .page-about .tab-grid {
    gap: 3.5rem;
  }
  .page-about .standards-list {
    gap: 1.5rem;
  }
  .page-about .standards-item {
    padding: 1rem 1.25rem;
  }
}

/* ===== 窄屏安全 ===== */
@media (max-width: 380px) {
  .page-about .hero-title {
    font-size: 1.6rem;
  }
  .page-about .tab-btn {
    font-size: 0.8rem;
    padding: 0.5rem 0.8rem;
  }
  .page-about .stat-card {
    min-width: 0;
    padding: 1rem 1.25rem;
  }
  .page-about .stat-number {
    font-size: 2.25rem;
  }
}

/* 图片响应 */
.page-about img {
  max-width: 100%;
  height: auto;
}