* { margin: 0; padding: 0; box-sizing: border-box; }

body { 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif; 
  line-height: 1.6; 
  color: #333;
  background: #fff;
}

/* 导航 */
.nav { 
  position: fixed; 
  top: 0; 
  width: 100%; 
  background: rgba(255,255,255,0.95); 
  backdrop-filter: blur(10px); 
  z-index: 100; 
  border-bottom: 1px solid #eee;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo { 
  font-size: 1.5rem; 
  font-weight: 700; 
  text-decoration: none; 
  color: #1a1a1a;
}

.nav-links { 
  display: flex; 
  gap: 1.5rem; 
}

.nav-links a { 
  color: #666; 
  text-decoration: none; 
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover { 
  color: #000; 
}

/* Hero */
.hero { 
  padding: 10rem 2rem 6rem; 
  text-align: center; 
  background: linear-gradient(135deg, #f8f8f8 0%, #fff 100%);
}

.hero h1 { 
  font-size: 3.5rem; 
  margin-bottom: 1rem; 
  letter-spacing: 0.3rem;
  font-weight: 300;
}

.hero p { 
  font-size: 1.25rem; 
  color: #666; 
  margin-bottom: 2rem;
  font-weight: 300;
}

.cta { 
  display: inline-block; 
  padding: 0.875rem 2.5rem; 
  background: #1a1a1a; 
  color: #fff; 
  border-radius: 2rem; 
  text-decoration: none;
  transition: all 0.3s;
}

.cta:hover { 
  background: #333;
  transform: translateY(-2px);
}

/* Section */
.section { 
  padding: 5rem 2rem; 
  max-width: 1200px; 
  margin: 0 auto;
}

.section.gray { 
  background: #f8f8f8;
  max-width: 100%;
}

.section.gray > * {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.section h2 { 
  font-size: 2rem; 
  margin-bottom: 0.5rem;
  font-weight: 400;
  letter-spacing: 0.1rem;
}

.subtitle { 
  color: #999; 
  margin-bottom: 3rem; 
  font-size: 0.9rem;
  font-weight: 300;
}

/* Grid */
.grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); 
  gap: 2rem;
}

.case-card { 
  background: #fff; 
  border-radius: 8px; 
  overflow: hidden; 
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s;
  display: block;
}

.case-card:hover { 
  transform: translateY(-4px); 
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.case-img {
  height: 220px;
  background: #e8e8e8;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 0.9rem;
}

.case-content { 
  padding: 1.5rem; 
}

.case-content h3 { 
  font-size: 1.1rem; 
  margin-bottom: 0.5rem; 
  color: #1a1a1a;
  font-weight: 500;
}

.case-content p { 
  color: #666; 
  font-size: 0.9rem; 
  line-height: 1.6;
}

/* Photo Grid */
.photo-grid { 
  display: grid; 
  grid-template-columns: repeat(3, 1fr); 
  gap: 1rem;
}

.photo-placeholder { 
  aspect-ratio: 4/3; 
  background: #e0e0e0; 
  border-radius: 8px; 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  color: #999;
  font-size: 0.85rem;
}

/* Dark Section */
.dark { 
  background: #1a1a1a !important; 
  color: #fff !important;
  max-width: 100% !important;
}

.dark > * {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.contact-form { 
  max-width: 500px; 
  margin: 2rem auto 0;
  display: flex; 
  flex-direction: column; 
  gap: 1rem; 
}

.contact-form input, 
.contact-form textarea { 
  padding: 0.875rem; 
  border: 1px solid #444; 
  border-radius: 4px; 
  font-size: 1rem;
  background: #222;
  color: #fff;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: #888;
}

.contact-form button { 
  padding: 0.875rem 2rem; 
  background: #fff; 
  color: #1a1a1a; 
  border: none; 
  border-radius: 4px; 
  cursor: pointer; 
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.2s;
}

.contact-form button:hover {
  background: #f0f0f0;
}

/* Footer */
.footer { 
  text-align: center; 
  padding: 4rem 2rem; 
  background: #f5f5f5; 
  color: #666;
}

.footer p:first-child {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: #1a1a1a;
}

.footer p:last-child {
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .nav { flex-direction: column; gap: 1rem; }
  .nav-links { gap: 1rem; flex-wrap: wrap; justify-content: center; }
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: 1fr; }
}