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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  color: #fff;
  min-height: 100vh;
}

/* 导航栏 */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 60px;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav .logo {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(90deg, #00d2ff, #3a7bd5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
}

nav ul li a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.3s;
}

nav ul li a:hover {
  color: #00d2ff;
}

/* Hero 区域 */
.hero {
  text-align: center;
  padding: 120px 20px 80px;
  animation: fadeIn 1s ease-out;
}

.hero h1 {
  font-size: 52px;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #00d2ff, #ff6ec7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.hero .btn-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 36px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #00d2ff, #3a7bd5);
  color: #fff;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 210, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: #00d2ff;
  color: #00d2ff;
  transform: translateY(-2px);
}

/* 功能卡片 */
.features {
  padding: 80px 20px;
  max-width: 1100px;
  margin: 0 auto;
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 50px;
  color: #fff;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 36px 28px;
  transition:
    transform 0.3s,
    box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.card .icon {
  font-size: 40px;
  margin-bottom: 18px;
}

.card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: #00d2ff;
}

.card p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

/* 底部 */
footer {
  text-align: center;
  padding: 40px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.4);
  font-size: 14px;
}

footer a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
}

footer a:hover {
  color: #00d2ff;
}

/* 动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式 */
@media (max-width: 600px) {
  nav {
    padding: 16px 20px;
  }
  nav ul {
    display: none;
  }
  .hero h1 {
    font-size: 32px;
  }
  .hero p {
    font-size: 16px;
  }
  .features h2 {
    font-size: 28px;
  }
}