/* style.css */
/* 重置浏览器默认样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f4f4f4;
  padding: 20px;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* 标题 */
h1, h2, h3 {
  color: #333;
  margin-bottom: 0.5rem;
}

/* 段落 */
p {
  margin-bottom: 1rem;
}

/* 链接 */
a {
  color: #0275d8;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* 按钮 */
button {
  background-color: #007bff;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  margin-right: 5px;
}

button:hover {
  background-color: #0056b3;
}

/* 表单 */
input[type="text"],
input[type="password"],
textarea {
  padding: 8px;
  margin-bottom: 15px;
  border: 1px solid #ddd;
  border-radius: 4px;
  width: calc(100% - 22px);
}

/* 响应式图片 */
img {
  max-width: 100%;
  height: auto;
}

/* 导航栏 */
nav {
  background-color: #333;
  color: #fff;
  padding: 10px 0;
}

nav ul {
  list-style: none;
  text-align: center;
}

nav ul li {
  display: inline;
  margin-right: 20px;
}

nav ul li a {
  color: #fff;
  padding: 5px 10px;
}

nav ul li a:hover {
  background-color: #555;
}

/* 页脚 */
footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 10px 0;
  position: absolute;
  bottom: 0;
  width: 100%;
}

/* 动画效果 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

/* 卡片样式 */
.card {
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  background-color: #fff;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

/* 网格系统 */
.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.grid-item {
  flex: 1;
  min-width: 200px;
}

/* 媒体查询 - 响应式设计 */
@media (max-width: 768px) {
  .grid-item {
    flex-basis: 100%;
  }
}