.cases-hero {
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('https://via.placeholder.com/1920x600/0d1b2a/ffffff?text=成功案例') center/cover;
  color: white;
  text-align: center;
  padding: 100px 20px;
}

.cases-hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.cases-hero p {
  font-size: 1.3rem;
  max-width: 800px;
  margin: 0 auto;
}

.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 3rem auto;
  max-width: 1000px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 12px 24px;
  background: #f8f9fa;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-btn.active, .filter-btn:hover {
  background: #00b4d8;
  color: white;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 4rem 0;
}

.case-card {
  background: white;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
}

.case-card:hover {
  transform: translateY(-10px);
}

.case-img {
  height: 180px;
  background: #00b4d8;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
}

.case-info {
  padding: 1.5rem;
}

.case-info h3 {
  font-size: 1.4rem;
  color: #0d1b2a;
  margin-bottom: 0.5rem;
}

.case-meta {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 0.8rem;
}

.case-info p {
  color: #555;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.case-stats {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed #ddd;
  font-size: 0.9rem;
}

.stat {
  background: #f0f4f8;
  padding: 8px 12px;
  border-radius: 8px;
  flex: 1;
}

.stat strong {
  display: block;
  color: #00b4d8;
  font-size: 1.1rem;
}

.client-logos {
  padding: 5rem 0;
  background: #f8f9fa;
  text-align: center;
}

.logos-container {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 2rem;
  margin-top: 2rem;
}

.logo-item {
  font-size: 2.5rem;
  color: #666;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}

.logo-item:hover {
  opacity: 1;
}

.testimonial {
  padding: 6rem 0;
  background: linear-gradient(135deg, #00b4d8, #0077b6);
  color: white;
  text-align: center;
}

.quote {
  font-size: 1.4rem;
  font-style: italic;
  max-width: 900px;
  margin: 0 auto 2rem;
  position: relative;
}

.quote::before {
  content: "";
  font-size: 5rem;
  position: absolute;
  top: -40px;
  left: -20px;
  opacity: 0.2;
}

.client-info {
  font-weight: 600;
}

.timeline {
  max-width: 800px;
  margin: 4rem auto;
  position: relative;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: #00b4d8;
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  margin: 2rem 0;
  position: relative;
}

.timeline-item:nth-child(odd) {
  justify-content: flex-end;
}

.timeline-content {
  width: 45%;
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  position: relative;
}

.timeline-content::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 20px;
  height: 20px;
  background: white;
  border: 3px solid #00b4d8;
  border-radius: 50%;
  transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-content::after {
  right: -12px;
}

.timeline-item:nth-child(even) .timeline-content::after {
  left: -12px;
}

.timeline-date {
  font-weight: 600;
  color: #00b4d8;
  margin-bottom: 0.5rem;
}