:root {
  --primary-color: #1E90FF;
  --secondary-color: #8A2BE2;
  --accent-color: #32CD32;
  --background-color: #F5F5F5;
  --text-color: #333;
  --border-radius: 8px;
  --transition-speed: 0.3s;
}

body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 40px 20px;
  text-align: center;
  animation: gradient-animation 10s infinite alternate;
}

@keyframes gradient-animation {
  from { background-position: 0% 50%; }
  to { background-position: 100% 50%; }
}

main {
  padding: 20px;
  max-width: 1400px;
  margin: auto;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.card {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  overflow: hidden;
  position: relative;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 12px rgba(0,0,0,0.15);
}

.card img {
  width: 100%;
  height: auto;
  display: block;
}

.card-content {
  padding: 15px;
}

.tag {
  background: var(--accent-color);
  color: white;
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 0.8em;
  display: inline-block;
  margin-bottom: 10px;
}

footer {
  background: var(--primary-color);
  color: white;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}

@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr;
  }
  
  header {
    padding: 30px 15px;
  }
}

.dynamic-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 10%, transparent 10.01%) 0 0,
              radial-gradient(circle, rgba(255,255,255,0.1) 10%, transparent 10.01%) 10px 10px;
  background-size: 20px 20px;
  animation: particle-effect 5s linear infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes particle-effect {
  0% { transform: translate(0, 0); }
  100% { transform: translate(10px, 10px); }
}

.button {
  background: var(--secondary-color);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background var(--transition-speed);
}

.button:hover {
  background: var(--accent-color);
}

.code-block {
  background: #f4f4f4;
  padding: 15px;
  border-radius: var(--border-radius);
  overflow-x: auto;
  font-family: monospace;
  color: #333;
}

/* 确保内容与边框保持距离 */
.container {
  max-width: 1200px;
  margin: auto;
  padding: 0 15px;
}

/* 提示文字样式 */
.tip {
  text-align: center;
  font-size: 1.2em;
  margin: 20px 0;
  color: var(--secondary-color);
}