/* 全局样式定义 */
body {
  margin: 0;
  font-family: 'Roboto', Arial, sans-serif;
  background: linear-gradient(135deg, #001f3f, #6c5ce7, #ff4d79);
  background-size: 300% 300%;
  animation: gradientShift 15s ease infinite;
  color: #fff;
  overflow-x: hidden;
}

@keyframes gradientShift {
  0% {background-position: 0% 50%;}
  50% {background-position: 100% 50%;}
  100% {background-position: 0% 50%;}
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  padding: 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

h1, h2, h3 {
  font-weight: bold;
  color: #fff;
  text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
}

h1 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 20px;
}

p {
  line-height: 1.6;
  color: #333;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
}

button {
  background-color: #6c5ce7;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s ease;
}

button:hover {
  background-color: #4CAF50;
  transform: scale(1.1);
}

pre {
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  padding: 15px;
  border-radius: 10px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

th, td {
  border: 1px solid #ddd;
  padding: 10px;
  text-align: left;
}

th {
  background-color: #6c5ce7;
  color: white;
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: 2rem;
  }
}

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

.fade-in {
  animation: fadeIn 1s ease-in-out;
}