/* 基础样式设置 */
body {
  background: linear-gradient(135deg, #F7F7F7, #E5E9F0); /* 使用渐变背景 */
  color: #1B263B; /* 主色调文字颜色 */
  font-family: 'Roboto', sans-serif; /* 现代无衬线字体 */
  margin: 0;
  padding: 0;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: linear-gradient(to right, #1B263B, #4CAF50); /* 渐变背景 */
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); /* 阴影效果 */
  z-index: 1000;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar a {
  color: #FFFFFF;
  margin: 0 15px;
  text-decoration: none;
  transition: color 0.3s;
}

.navbar a:hover {
  color: #FF8C00; /* 点缀色 */
}

/* 主要内容容器 */
.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 100px 20px 40px; /* 顶部留出导航栏空间 */
}

/* 卡片样式 */
.card {
  background: linear-gradient(135deg, #1B263B 0%, #4CAF50 100%);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  flex: 1 1 300px;
  margin: 10px;
  max-width: 650px; /* 最大宽度限制 */
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
}

/* 卡片内容 */
.card-inner {
  perspective: 1000px;
}

.card-inner .card-front,
.card-inner .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 8px;
}

.card-front {
  padding: 20px;
}

.card-back {
  transform: rotateY(180deg);
  background-color: #FF8C00;
  color: #FFFFFF;
  padding: 20px;
}

/* 图片样式 */
img.decorative {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

img.decorative:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
}

/* 标题样式 */
h2, h3, h4 {
  color: #1B263B;
}

h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

h3 {
  font-size: 20px;
  margin-bottom: 15px;
}

h4 {
  font-size: 18px;
  margin-bottom: 10px;
}

/* 段落样式 */
p {
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 15px;
}

/* 代码块样式 */
pre {
  background: #1B263B;
  color: #E5E9F0;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 20px;
  font-size: 14px;
}

/* 表格样式 */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}

table th, table td {
  border: 1px solid #E5E9F0;
  padding: 10px;
  text-align: left;
}

table th {
  background-color: #4CAF50;
  color: #FFFFFF;
}

table tbody tr:nth-child(even) {
  background-color: #F7F7F7;
}

/* 按钮样式 */
button, .chat-button {
  background-color: #FF8C00;
  color: #FFFFFF;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover, .chat-button:hover {
  background-color: #4CAF50;
}

/* 底部样式 */
.footer {
  background-color: #1B263B;
  color: #E5E9F0;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.footer .languages, .footer .social-media {
  display: flex;
  align-items: center;
}

.footer .languages a, .footer .social-media a {
  color: #FF8C00;
  margin-right: 15px;
  text-decoration: none;
  transition: color 0.3s;
}

.footer .languages a:hover, .footer .social-media a:hover {
  color: #4CAF50;
}

/* 搜索栏样式 */
.search-bar {
  width: 100%;
  max-width: 400px;
  margin: 20px auto;
  display: flex;
}

.search-bar input {
  flex: 1;
  padding: 10px 15px;
  border: 2px solid #1B263B;
  border-right: none;
  border-radius: 4px 0 0 4px;
  outline: none;
  transition: border-color 0.3s;
}

.search-bar input:focus {
  border-color: #FF8C00;
}

.search-bar button {
  padding: 10px 20px;
  border: 2px solid #1B263B;
  background-color: #1B263B;
  color: #FFFFFF;
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  transition: background-color 0.3s, border-color 0.3s;
}

.search-bar button:hover {
  background-color: #FF8C00;
  border-color: #FF8C00;
}

/* 成功案例模块样式 */
.success-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  padding: 40px;
  background-color: #FFFFFF;
}

.case {
  background-color: #F7F7F7;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.case:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.case .rating {
  color: #4CAF50;
  margin-bottom: 10px;
}

/* 动画效果 */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s forwards;
  animation-delay: 0.3s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animated-element {
  opacity: 0;
  transition: all 0.5s ease-in-out;
}

.animated-element.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 几何图形样式 */
.geometric-shape {
  width: 100px;
  height: 100px;
  background: linear-gradient(45deg, #1B263B, #4CAF50);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  position: relative;
}

.geometric-shape::after {
  content: '';
  position: absolute;
  top: 20px;
  left: 20px;
  width: 60px;
  height: 60px;
  background: #FFFFFF;
  clip-path: circle(50%);
}

/* 提示信息样式 */
.reference-note {
  text-align: center;
  background-color: #4CAF50;
  color: #FFFFFF;
  padding: 10px 0;
  font-size: 18px;
  margin: 20px 0;
  border-radius: 4px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .container {
    padding: 120px 10px 20px;
  }

  .search-bar {
    flex-direction: column;
  }

  .search-bar input, .search-bar button {
    width: 100%;
    border-radius: 4px;
  }

  .search-bar button {
    margin-top: 10px;
    border-radius: 4px;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer .languages, .footer .social-media {
    margin-bottom: 10px;
  }
}

/* 折叠区域样式 */
.details-summary {
  background-color: #FF8C00;
  color: #FFFFFF;
  padding: 10px;
  border-radius: 4px;
  cursor: pointer;
  margin-bottom: 10px;
}

.details-content {
  display: none;
  padding: 10px;
  background-color: #FFFFFF;
  border: 1px solid #E5E9F0;
  border-radius: 4px;
}

details[open] .details-content {
  display: block;
}

/* 代码块美化 */
.code-example {
  background-color: #1B263B;
  color: #E5E9F0;
  padding: 15px;
  border-radius: 8px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
  overflow-x: auto;
}