body, html {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background-color: #0d1117;
  color: #cdd9e5;
  scroll-behavior: smooth;
}

.bg-container {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.bg-animation {
  width: 150%;
  opacity: 0.2;
  animation: moveBG 30s linear infinite;
}

@keyframes moveBG {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.hero {
  text-align: center;
  padding: 120px 20px;
}

.logo {
  width: 120px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 3rem;
  color: #39ff14;
  margin: 0;
}

.hero .subtitle {
  font-size: 1.3rem;
  color: #4ea3ff;
  margin: 10px 0 30px;
}

.hero-buttons .btn {
  display: inline-block;
  margin: 0 10px;
  padding: 12px 28px;
  border-radius: 25px;
  text-decoration: none;
  color: #0d1117;
  font-weight: bold;
  transition: 0.3s;
}

.btn.primary {
  background: #39ff14;
}
.btn:not(.primary) {
  background: #4ea3ff;
}

.btn:hover {
  opacity: 0.8;
}

section {
  padding: 80px 20px;
  text-align: center;
}

section h2 {
  font-size: 2rem;
  margin-bottom: 40px;
}
section h2 span {
  font-size: 1rem;
  color: #4ea3ff;
}

.feature-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 30px;
}

.card {
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 15px;
  width: 300px;
  padding: 20px;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 0 15px #39ff14;
}

.card img {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 15px;
}

pre {
  background: #161b22;
  color: #39ff14;
  text-align: left;
  padding: 15px;
  border-radius: 10px;
  overflow-x: auto;
}

footer {
  background: #0d1117;
  color: #8b949e;
  text-align: center;
  padding: 20px;
  font-size: 0.9rem;
}

footer a {
  color: #4ea3ff;
  text-decoration: none;
}

.qq-group-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.group-tip {
  font-size: 0.9rem;
  color: #8b949e;
}