/* ===== 品牌档案页专属样式 ===== */
.page-about {
  --about-bg-dark: var(--color-secondary);
  --about-bg-alt: var(--color-bg-gray);
  --about-bg-light: var(--color-bg-cream);
  --about-accent: var(--color-accent);
  --about-primary: var(--color-primary);
  --about-text-light: var(--color-white);
  --about-text-body: var(--color-text);
  --about-font-heading: var(--font-heading);
  --about-font-body: var(--font-body);
  --about-radius: 8px;
  --about-transition: var(--transition);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg) 0;
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: var(--size-small);
  color: var(--color-text-light);
}
.page-about .breadcrumb-item[aria-current="page"] {
  font-weight: 700;
  color: var(--color-text);
}
.page-about .breadcrumb-sep {
  color: var(--color-text-light);
  user-select: none;
}

/* ===== 品牌核心区 ===== */
.page-about .brand-hero {
  position: relative;
  background: var(--about-bg-dark);
  padding: var(--space-xl) var(--space-lg) var(--space-2xl);
  overflow: hidden;
}
.page-about .brand-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 20% 50%, rgba(229,57,53,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.page-about .brand-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}
.page-about .brand-symbol {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .brand-symbol-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 1/1;
  object-fit: contain;
  filter: drop-shadow(0 8px 32px rgba(255,213,79,0.2));
}
.page-about .brand-mission {
  text-align: center;
}
.page-about .mission-title {
  font-family: var(--about-font-heading);
  font-size: var(--size-h1);
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--about-text-light);
  margin: 0 0 var(--space-sm);
  line-height: 1.2;
}
.page-about .mission-sub {
  display: block;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--about-accent);
  letter-spacing: 2px;
  margin-top: var(--space-xs);
}
.page-about .mission-desc {
  font-family: var(--about-font-body);
  font-size: var(--size-body);
  color: rgba(255,255,255,0.85);
  line-height: 1.7;
  max-width: 640px;
  margin: var(--space-md) auto var(--space-lg);
}
.page-about .highlight-text {
  color: var(--about-accent);
  font-weight: 700;
}
.page-about .brand-mission .btn {
  display: inline-block;
  background: var(--about-primary);
  color: var(--about-text-light);
  font-family: var(--about-font-heading);
  font-size: var(--size-body);
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--about-radius);
  text-decoration: none;
  transition: opacity var(--about-transition), transform var(--about-transition);
}
.page-about .brand-mission .btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* ===== 发展历程时间线 ===== */
.page-about .timeline-section {
  background: var(--about-bg-alt);
  padding: var(--space-2xl) var(--space-lg);
}
.page-about .timeline-section .section-title {
  margin-bottom: var(--space-xl);
}
.page-about .timeline {
  position: relative;
  padding-left: var(--space-xl);
}
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, var(--about-primary), var(--about-accent), var(--about-primary));
  border-radius: 2px;
}

/* 时间线节点 */
.page-about .tl-node {
  position: relative;
  margin-bottom: var(--space-xl);
  background: var(--about-bg-light);
  border-radius: var(--about-radius);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--about-transition);
  /* 胶卷纹理装饰边框 */
  border: 2px solid transparent;
  border-image: repeating-linear-gradient(
    90deg,
    var(--about-primary) 0px,
    var(--about-primary) 6px,
    transparent 6px,
    transparent 12px
  ) 2;
}
.page-about .tl-node:nth-child(even) {
  background: var(--about-bg-alt);
  border-image: repeating-linear-gradient(
    90deg,
    var(--about-accent) 0px,
    var(--about-accent) 6px,
    transparent 6px,
    transparent 12px
  ) 2;
}
.page-about .tl-node:hover {
  box-shadow: var(--shadow-md);
}
.page-about .tl-marker {
  position: absolute;
  left: calc(-1 * var(--space-xl) + 4px);
  top: var(--space-lg);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--about-primary);
  border: 4px solid var(--about-bg-light);
  box-shadow: 0 0 0 2px var(--about-primary);
  z-index: 2;
  transform: translateX(-50%);
}
.page-about .tl-node:nth-child(1) .tl-marker { background: var(--about-primary); }
.page-about .tl-node:nth-child(2) .tl-marker { background: var(--about-accent); box-shadow: 0 0 0 2px var(--about-accent); }
.page-about .tl-node:nth-child(3) .tl-marker { background: var(--color-green); box-shadow: 0 0 0 2px var(--color-green); }
.page-about .tl-node:nth-child(4) .tl-marker { background: var(--color-terracotta); box-shadow: 0 0 0 2px var(--color-terracotta); }

.page-about .tl-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.page-about .tl-text {
  display: flex;
  flex-direction: column;
}
.page-about .tl-phase {
  font-family: var(--about-font-heading);
  font-size: var(--size-h3);
  font-weight: 700;
  color: var(--about-bg-dark);
  margin: 0 0 var(--space-sm);
  letter-spacing: 0.5px;
}
.page-about .tl-details[data-expanded="true"] {
  display: block;
}
.page-about .tl-details[data-expanded="false"] {
  display: none;
}
.page-about .tl-details p {
  font-family: var(--about-font-body);
  font-size: var(--size-body);
  color: var(--about-text-body);
  line-height: 1.7;
  margin: 0 0 var(--space-sm);
}
.page-about .tl-toggle {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: none;
  border: none;
  padding: var(--space-xs) 0;
  font-family: var(--about-font-body);
  font-size: var(--size-small);
  font-weight: 700;
  color: var(--color-link);
  cursor: pointer;
  transition: color var(--about-transition);
}
.page-about .tl-toggle:hover {
  color: var(--color-link-hover);
}
.page-about .tl-toggle-icon {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--about-transition);
}
.page-about .tl-toggle[aria-expanded="true"] .tl-toggle-icon {
  transform: rotate(-135deg);
}
.page-about .tl-image {
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  border-radius: var(--about-radius);
}
.page-about .tl-image img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--about-radius);
  transition: transform var(--about-transition);
}
.page-about .tl-image img:hover {
  transform: scale(1.02);
}
.page-about .timeline-cta {
  text-align: center;
  margin-top: var(--space-lg);
  font-family: var(--about-font-body);
  font-size: var(--size-body);
  color: var(--about-text-body);
}

/* ===== 服务理念 ===== */
.page-about .service-philosophy {
  background: var(--about-bg-dark);
  padding: var(--space-2xl) var(--space-lg);
  color: var(--about-text-light);
}
.page-about .service-philosophy .section-title {
  color: var(--about-accent);
}
.page-about .philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: start;
}
.page-about .philosophy-card {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(4px);
  border-radius: var(--about-radius);
  padding: var(--space-lg);
  border-left: 4px solid var(--about-accent);
  transition: background var(--about-transition), transform var(--about-transition);
}
.page-about .philosophy-card:hover {
  background: rgba(255,255,255,0.1);
  transform: translateX(4px);
}
.page-about .philosophy-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  border-radius: 50%;
  background: rgba(255,213,79,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.page-about .philosophy-icon::after {
  content: '';
  width: 24px;
  height: 24px;
  background: var(--about-accent);
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
}
.page-about .philosophy-icon-user::after {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFD54F' stroke-width='2'%3E%3Ccircle cx='12' cy='8' r='4'/%3E%3Cpath d='M4 20c0-4 3.6-7 8-7s8 3 8 7'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFD54F' stroke-width='2'%3E%3Ccircle cx='12' cy='8' r='4'/%3E%3Cpath d='M4 20c0-4 3.6-7 8-7s8 3 8 7'/%3E%3C/svg%3E");
}
.page-about .philosophy-icon-local::after {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFD54F' stroke-width='2'%3E%3Cpath d='M12 2C8.1 2 5 5.1 5 9c0 5.3 7 13 7 13s7-7.7 7-13c0-3.9-3.1-7-7-7z'/%3E%3Ccircle cx='12' cy='9' r='2.5'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFD54F' stroke-width='2'%3E%3Cpath d='M12 2C8.1 2 5 5.1 5 9c0 5.3 7 13 7 13s7-7.7 7-13c0-3.9-3.1-7-7-7z'/%3E%3Ccircle cx='12' cy='9' r='2.5'/%3E%3C/svg%3E");
}
.page-about .philosophy-icon-realtime::after {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFD54F' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M12 7v5l3 3'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFD54F' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M12 7v5l3 3'/%3E%3C/svg%3E");
}
.page-about .philosophy-card-title {
  font-family: var(--about-font-heading);
  font-size: var(--size-h3);
  font-weight: 700;
  color: var(--about-accent);
  margin: 0 0 var(--space-sm);
  letter-spacing: 0.5px;
}
.page-about .philosophy-card p {
  font-family: var(--about-font-body);
  font-size: var(--size-body);
  color: rgba(255,255,255,0.85);
  line-height: 1.7;
  margin: 0;
}
.page-about .philosophy-image {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: var(--space-md);
}
.page-about .philosophy-image img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 1/1;
  object-fit: contain;
  border-radius: var(--about-radius);
  filter: drop-shadow(0 4px 20px rgba(255,213,79,0.15));
}
.page-about .philosophy-footer {
  text-align: center;
  margin-top: var(--space-xl);
  font-family: var(--about-font-body);
  font-size: var(--size-body);
  color: rgba(255,255,255,0.7);
}
.page-about .philosophy-footer .text-link {
  color: var(--about-accent);
  text-decoration: underline;
  transition: opacity var(--about-transition);
}
.page-about .philosophy-footer .text-link:hover {
  opacity: 0.8;
}

/* ===== 响应式设计 ===== */
/* 移动端优先（已适配）— 窄屏增强 */
@media (max-width: 480px) {
  .page-about .breadcrumb {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
    flex-wrap: wrap;
  }
  .page-about .brand-hero {
    padding: var(--space-lg) var(--space-md) var(--space-xl);
  }
  .page-about .mission-title {
    font-size: 2rem;
  }
  .page-about .mission-sub {
    font-size: 1rem;
  }
  .page-about .brand-symbol-img {
    max-width: 200px;
  }
  .page-about .timeline-section {
    padding: var(--space-xl) var(--space-md);
  }
  .page-about .timeline {
    padding-left: var(--space-lg);
  }
  .page-about .tl-node {
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
  }
  .page-about .tl-marker {
    left: calc(-1 * var(--space-lg) + 4px);
    width: 16px;
    height: 16px;
    top: var(--space-md);
  }
  .page-about .timeline::before {
    left: 8px;
  }
  .page-about .tl-phase {
    font-size: 1.3rem;
  }
  .page-about .tl-image img {
    max-width: 100%;
  }
  .page-about .service-philosophy {
    padding: var(--space-xl) var(--space-md);
  }
  .page-about .philosophy-card {
    padding: var(--space-md);
  }
  .page-about .philosophy-image img {
    max-width: 280px;
  }
}

/* 平板及以上 */
@media (min-width: 768px) {
  .page-about .brand-hero-inner {
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-2xl);
  }
  .page-about .brand-symbol-img {
    max-width: 360px;
  }
  .page-about .brand-mission {
    text-align: left;
  }
  .page-about .mission-desc {
    margin-left: 0;
    margin-right: 0;
  }
  .page-about .tl-content {
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-lg);
  }
  .page-about .tl-image {
    justify-content: flex-end;
  }
  .page-about .philosophy-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
  .page-about .philosophy-image {
    grid-column: 1 / -1;
    margin-top: 0;
  }
  .page-about .philosophy-image img {
    max-width: 480px;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .brand-hero {
    padding: var(--space-2xl) var(--space-lg) 5rem;
  }
  .page-about .brand-symbol-img {
    max-width: 420px;
  }
  .page-about .mission-title {
    font-size: 3.2rem;
  }
  .page-about .mission-sub {
    font-size: 1.4rem;
  }
  .page-about .timeline {
    padding-left: var(--space-2xl);
  }
  .page-about .timeline::before {
    left: 16px;
  }
  .page-about .tl-marker {
    left: calc(-1 * var(--space-2xl) + 4px);
    width: 24px;
    height: 24px;
  }
  .page-about .tl-node {
    padding: var(--space-xl);
  }
  .page-about .tl-content {
    grid-template-columns: 1.5fr 1fr;
  }
  .page-about .philosophy-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .page-about .philosophy-image {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
  }
  .page-about .philosophy-image img {
    max-width: 400px;
  }
}

/* 宽屏内容宽度约束 */
@media (min-width: 1200px) {
  .page-about .brand-hero-inner,
  .page-about .timeline-section .container,
  .page-about .service-philosophy .container {
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
  }
}