body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0d0d0d;
  color: #fff;
  overflow-x: hidden;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  padding: 20px 40px;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.nav a {
  color: #fff;
  margin-left: 25px;
  text-decoration: none;
  font-size: 16px;
}

/* 科技背景 */
.tech-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml;utf8,
  <svg xmlns="http://www.w3.org/2000/svg" width="800" height="800">
    <g stroke="%23333" stroke-width="0.5">
      <line x1="0" y1="0" x2="800" y2="800"/>
      <line x1="800" y1="0" x2="0" y2="800"/>
      <line x1="400" y1="0" x2="400" y2="800"/>
      <line x1="0" y1="400" x2="800" y2="400"/>
    </g>
  </svg>') repeat;
  opacity: 0.15;
  z-index: -1;
}

/* Hero */
.hero {
  padding: 160px 20px;
  text-align: center;
}
.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
  animation: fadeIn 1.2s ease;
}
.hero p {
  font-size: 20px;
  opacity: 0.8;
  animation: fadeIn 1.6s ease;
}
.btn-group {
  margin-top: 30px;
  animation: fadeIn 2s ease;
}
.btn {
  padding: 14px 30px;
  border-radius: 6px;
  text-decoration: none;
  margin: 10px;
  display: inline-block;
}
.btn.primary {
  background: #ffcc00;
  color: #000;
}
.btn.secondary {
  background: #fff;
  color: #000;
}

/* Features */
.features {
  padding: 80px 20px;
  text-align: center;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
  margin-top: 40px;
}
.card {
  background: #1a1a1a;
  padding: 30px;
  border-radius: 10px;
  border: 1px solid #333;
  transition: 0.3s;
}
.card:hover {
  border-color: #ffcc00;
  transform: translateY(-5px);
}

/* Market */
.market {
  padding: 80px 20px;
  text-align: center;
}
.market-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.market-card {
  background: #1a1a1a;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #333;
}

/* 动画 */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Footer */
footer {
  text-align: center;
  padding: 30px;
  background: #000;
  margin-top: 40px;
}