/* 通用基础样式 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background-color: #f9f9fb;
  color: #333;
}

/* 导航栏 */
/* 顶部导航栏增强样式 */
header {
  background: linear-gradient(to right, #123250, #214F6D);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

/* 内部容器 */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1080px;
  margin: auto;
  padding: 12px 20px;
}

/* LOGO */
.nav .logo {
  font-size: 1.5em;
  font-weight: bold;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: #ffffff;
  font-weight: bold;
  font-size: 1.0em;
}

.logo-icon {
  height: 40px;
  width: 55px;
  margin-right: 5px;
}


/* 导航链接 */
.nav nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #e8f1ff;
  font-weight: 500;
  padding: 8px 10px;
  border-radius: 4px;
  transition: background 0.3s, color 0.3s;
}

/* 鼠标悬停样式 */
.nav nav a:hover {
  background-color: rgba(255,255,255,0.2);
  color: #fff;
}

/* 当前页面链接高亮（需要手动为当前链接加类 .active） */
.nav nav a.active {
  background-color: rgba(255,255,255,0.3);
  color: #fff;
  font-weight: 600;
}

/* Hero Banner */
.hero {
  text-align: center;
  background: linear-gradient(to right, #e0f7fa, #e3f2fd);
  padding: 60px 20px;
}

.hero h1 {
  font-size: 2em;
  margin-bottom: 10px;
  color: #2c3e50;
}

.hero p {
  font-size: 1.1em;
  color: #555;
  margin-bottom: 20px;
}

.btn, .btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  background-color: #007BFF;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: bold;
  transition: background-color 0.3s;
}

.btn:hover {
  background-color: #0056b3;
}

.btn-secondary {
  background-color: #6c757d;
}

.btn-secondary:hover {
  background-color: #565e64;
}

/* 通用内容块 */
.section {
  max-width: 1080px;
  margin: 40px auto;
  padding: 0 20px;
}

.section h2 {
  font-size: 1.6em;
  margin-bottom: 20px;
  color: #0b3c8d;
}

/* 卡片栅格 */
.cards .card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border-left: 4px solid #007BFF;
}

.card h3 {
  margin-top: 0;
  font-size: 1.1em;
  color: #007BFF;
}

.card p {
  font-size: 0.95em;
  color: #555;
}

/* 页脚 */
footer {
  background-color: #f1f1f1;
  padding: 20px;
  text-align: center;
  font-size: 0.9em;
  color: #777;
  margin-top: 40px;
}

.footer-links a {
  margin: 0 8px;
  text-decoration: none;
  color: #007BFF;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ✅ 页脚增强样式 */
.footer-enhanced {
  background-color: #f8f9fb;
  padding: 40px 20px 20px;
  border-top: 1px solid #ddd;
  font-size: 0.95em;
  color: #555;
}

.footer-container {
  max-width: 1080px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
}

.footer-col {
  flex: 1 1 220px;
}

.footer-col h4 {
  margin-bottom: 12px;
  color: #2c3e50;
  font-size: 1.1em;
}

.footer-col p {
  margin: 0;
  color: #777;
  line-height: 1.6;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #007BFF;
  text-decoration: none;
}

.footer-col ul li a:hover {
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  margin-top: 30px;
  color: #999;
}

/* ✅ 移动端导航菜单 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 28px;
  color: #ffffff;
  cursor: pointer;
}

/* 📱 移动端样式（宽度 <= 768px） */
@media (max-width: 768px) {
  .nav {
    flex-wrap: wrap;
  }

  .menu-toggle {
    display: block;
  }

  .nav nav {
    display: none;
    flex-direction: column;
    width: 100%;
    background-color: #007BFF;
    margin-top: 10px;
    border-radius: 6px;
    padding: 10px 0;
  }

  .nav nav.active {
    display: flex;
  }

  .nav nav a {
    margin: 8px 0;
    text-align: center;
    color: #fff;
  }

  .nav nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
  }
}