/* --- 基础样式重置 --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5px;
}

/* --- 导航栏 --- */
.header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}
.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
}
.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #e63946;
}
.header nav ul {
  display: flex;
  list-style: none;
  gap: 20px;
}
.header nav a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s;
}
.header nav a:hover {
  color: #e63946;
}

/* --- 英雄区 --- */
.hero {
  height: 100vh;
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
}
.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}
.hero p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 30px;
  opacity: 0.9;
}
.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
}

/* --- 按钮通用样式 --- */
.btn-primary,
.btn-secondary {
  padding: 12px 30px;
  border-radius: 50px;
  font-weight: bold;
  text-decoration: none;
  transition: all 0.3s;
}
.btn-primary {
  background-color: #fff;
  color: #2575fc;
}
.btn-secondary {
  background-color: transparent;
  color: #fff;
  border: 2px solid #fff;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}
.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* --- 服务板块 --- */
.services {
  padding: 100px 0;
  background-color: #f4f4f4;
}
.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 60px;
  color: #333;
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
}
.card {
  background: #fff;
  padding: 40px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s;
  text-align: center;
}
.card:hover {
  transform: translateY(-10px);
}
.card-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  color: #2575fc;
}
.card h3 {
  margin-bottom: 20px;
  font-size: 1.5rem;
}
.feature-list {
  margin-top: 20px;
  text-align: left;
  list-style: none;
}
.feature-list li {
  padding: 5px 0;
  position: relative;
  padding-left: 20px;
}
.feature-list li::before {
  content: "▹";
  color: #e63946;
  position: absolute;
  left: 0;
}

/* --- 技术工具板块 --- */
.tools {
  padding: 100px 0;
  background-color: #2575fc;
  color: #fff;
}
.tools .container {
  text-align: center;
}
.tools-intro {
  max-width: 700px;
  margin: 0 auto 50px;
  opacity: 0.8;
  font-size: 1.1rem;
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  text-align: left;
}
.tool-item {
  background-color: rgba(255, 255, 255, 0.1);
  padding: 30px;
  border-radius: 10px;
  backdrop-filter: blur(10px);
}
.tool-item h4 {
  margin-bottom: 15px;
  font-size: 1.3rem;
}
.tool-item i {
  color: #ffd700;
  margin-right: 10px;
}

/* --- 页脚 --- */
.footer {
  background-color: #1a1a1a;
  color: #ccc;
  padding: 60px 0 30px;
}
.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-about h3,
.footer-contact h3 {
  color: #fff;
  margin-bottom: 20px;
}
.footer-contact p {
  margin-bottom: 10px;
}
.copyright {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid #333;
  font-size: 0.9rem;
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* --- 响应式设计 --- */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .menu-toggle {
    display: block;
  }

  .header .container {
    flex-wrap: wrap;
  }

  .nav-menu {
    display: none;
    width: 100%;
    margin-top: 20px;
  }

  .nav-menu.active {
    display: block;
  }

  .header nav ul {
    flex-direction: column;
    gap: 15px;
  }

  .language-switcher {
    /* display: none; */
    /* width: 100%; */
    text-align: right;
  }

  .language-switcher.active {
    display: block;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.btn-subscribe {
  background-color: #4caf50; /* 绿色背景 */
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
  display: inline-block;
  /* margin-left: 10px; */
}
.btn-subscribe:hover {
  background-color: #45a049;
  transform: none; /* 覆盖掉之前a标签可能有的变形 */
}

.language-switcher {
  margin-left: 10px;
  text-align: right;
  /* width: 100%; */
}
#langSelect {
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: #fff;
  font-size: 0.9rem;
  cursor: pointer;
}
#langSelect:hover {
  border-color: #2575fc;
}