/* 艺展天下 - 统一背景色，所有容器透明 */
* { margin:0; padding:0; box-sizing:border-box; }
body { 
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; 
  background-color: #ffffff;  /* 在此修改全局背景色，透明PNG将透出此颜色 */
  color: #1a1a1a; 
  line-height: 1.5; 
}
.container { max-width: 1400px; margin: 0 auto; padding: 0 24px; }
header { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  padding: 20px 32px; 
  background-color: transparent;
}
.logo a { display: inline-flex; align-items: center; text-decoration: none; }
.logo img { height: 44px; width: auto; vertical-align: middle; display: block; }
nav { display: flex; gap: 32px; }
nav a { 
  text-decoration: none; 
  color: #555; 
  font-weight: 500; 
  font-size: 1rem; 
  padding: 6px 12px; 
  border-radius: 30px; 
  transition: background-color 0.2s, color 0.2s; 
}
nav a:hover { background-color: rgba(0,0,0,0.05); color: #000; }
nav a.active { color: #000; border-bottom: 2px solid #000; border-radius: 0; background-color: transparent; }
.text-banner { background-color: transparent; padding: 60px 24px; text-align: center; }
.banner-chinese { font-size: 2.5rem; font-weight: 700; color: #111; margin-bottom: 16px; letter-spacing: 2px; }
.banner-english-medium { font-size: 1.5rem; font-weight: 500; color: #333; margin-bottom: 24px; }
.banner-small-text { font-size: 0.75rem; color: #666; max-width: 800px; margin: 0 auto; line-height: 1.6; }
.section { padding: 64px 0; }
.section-title { font-size: 2rem; font-weight: 600; margin-bottom: 48px; text-align: center; color: #111; }
.case-grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); 
  gap: 48px 32px;
}
.case-card {
  background-color: transparent;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border-radius: 0;
  overflow: visible;
}
.case-card:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  z-index: 1;
}
.case-thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  width: 100%;
  background-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.case-label {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(2px);
  color: #fff;
  font-size: 0.9rem;
  padding: 5px 12px;
  border-radius: 2px;
  z-index: 5;
  pointer-events: none;
  white-space: nowrap;
  font-weight: normal;
  letter-spacing: 0.5px;
  line-height: 1.3;
}
.case-thumb img, .case-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 0;
}
.case-info { padding: 4px 0 0 0; }
.case-title { font-size: 1.2rem; font-weight: 500; color: #222; margin: 0; }
.case-card:hover .case-title { color: #000; }
.team-home { text-align: center; max-width: 700px; margin: 0 auto; }
.team-desc-home { font-size: 1rem; color: #555; margin-bottom: 24px; }
.btn-contact { display: inline-block; background: #000; color: #fff; padding: 12px 28px; border-radius: 40px; text-decoration: none; font-weight: 500; transition: background 0.2s; }
.btn-contact:hover { background: #333; }
footer { text-align: center; padding: 32px 24px; background-color: transparent; color: #888; font-size: 0.85rem; }

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.75rem; }
  header { flex-direction: column; gap: 12px; padding: 16px; }
  nav { gap: 24px; }
  .logo img { height: 36px; }
  .banner-chinese { font-size: 1.8rem; }
  .banner-english-medium { font-size: 1.2rem; }
  .case-grid { gap: 32px 16px; }
  .case-info { padding-top: 4px; }
  .case-label {
    top: 6px;
    right: 6px;
    font-size: 0.8rem;
    padding: 4px 10px;
    white-space: nowrap;
  }
}
@media (max-width: 480px) {
  .case-grid { grid-template-columns: 1fr; gap: 32px; }
  .case-label {
    white-space: nowrap;
    font-size: 0.75rem;
    padding: 3px 9px;
  }
}