/* 通用样式 */
body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background: #fff;
}
a { text-decoration: none; color: inherit; }
h1, h2, h3, p { margin: 0; }

/* Header */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: linear-gradient(90deg, rgba(255,255,255,0.9), rgba(245,245,245,0.9));
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  z-index: 1000;
  backdrop-filter: blur(8px);
}
.header-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header-logo {
  font-size: 22px;
  font-weight: bold;
  background: linear-gradient(45deg, #007bff, #00c6ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.header-menu .menu {
  display: flex;
  gap: 30px;
}
.menu-box a {
  font-size: 16px;
  position: relative;
  padding: 6px 0;
  transition: color 0.3s;
}
.menu-box a:hover { color: #007bff; }
.menu-box a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: #007bff;
  transition: width 0.3s;
}
.menu-box a:hover::after { width: 100%; }

/* Banner */
.banner {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, #007bff, #00c6ff);
  padding: 0 20px;
}
.banner-intro {
  max-width: 800px;
}
.banner-intro h1 {
  font-size: 52px;
  margin-bottom: 20px;
  font-weight: 700;
}
.banner-intro p {
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 30px;
}
.download {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.download-box a {
  display: inline-block;
  padding: 12px 24px;
  background: #fff;
  color: #007bff;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s;
}
.download-box a:hover {
  background: #007bff;
  color: #fff;
}

/* Intro */
.intro {
  max-width: 1200px;
  margin: 80px auto;
  padding: 0 20px;
  text-align: center;
}
.intro h2 { font-size: 32px; margin-bottom: 12px; }
.intro-desc {
  font-size: 16px;
  color: #666;
  margin-bottom: 40px;
}
.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}
.intro-item {
  background: linear-gradient(135deg, #fdfdfd, #f5f7fa);
  border-radius: 12px;
  padding: 30px 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}
.intro-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}
.intro-item h3 { font-size: 20px; margin-bottom: 12px; }
.intro-item p { font-size: 14px; color: #555; }

/* Authorize */
.authorize {
  background: linear-gradient(135deg, #f5f7fa, #eaf1f9);
  padding: 80px 20px;
  text-align: center;
}
.authorize-content {
  max-width: 700px;
  margin: 0 auto;
}
.authorize-content h2 {
  font-size: 28px;
  margin-bottom: 20px;
}
.authorize-content p {
  font-size: 16px;
  margin-bottom: 20px;
  color: #444;
}
.authorize-btn {
  display: inline-block;
  padding: 12px 30px;
  background: linear-gradient(45deg, #007bff, #00c6ff);
  color: #fff;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 500;
  transition: opacity 0.3s;
}
.authorize-btn:hover { opacity: 0.85; }

/* Footer */
.footer {
  background: #222;
  color: #ccc;
  text-align: center;
  padding: 20px;
  font-size: 14px;
}

/* 响应式 */
@media (max-width: 1024px) {
  .banner-intro h1 { font-size: 42px; }
}
@media (max-width: 768px) {
  .header-wrap { flex-direction: column; gap: 10px; }
  .banner-intro h1 { font-size: 32px; }
  .banner-intro p { font-size: 16px; }
}
@media (max-width: 480px) {
  .download-box a { font-size: 14px; padding: 10px 18px; }
  .intro h2 { font-size: 24px; }
  .authorize-content h2 { font-size: 22px; }
}
/* Header */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: linear-gradient(90deg, rgba(255,255,255,0.95), rgba(245,245,245,0.95));
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  z-index: 1000;
  backdrop-filter: blur(8px);
}
.header-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header-logo {
  font-size: 22px;
  font-weight: bold;
  background: linear-gradient(45deg, #007bff, #00c6ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 菜单 */
.header-menu {
  display: flex;
}
.header-menu .menu {
  display: flex;
  gap: 30px;
}
.menu-box a {
  font-size: 16px;
  position: relative;
  padding: 6px 0;
  transition: color 0.3s;
}
.menu-box a:hover { color: #007bff; }
.menu-box a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: #007bff;
  transition: width 0.3s;
}
.menu-box a:hover::after { width: 100%; }

/* 汉堡按钮 */
.hamburger {
  display: none;
  font-size: 28px;
  cursor: pointer;
  user-select: none;
}

/* 响应式导航 */
@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
  .header-menu {
    display: none;
    position: absolute;
    top: 60px; right: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    padding: 15px;
    flex-direction: column;
    gap: 15px;
    min-width: 140px;
  }
  .header-menu.show {
    display: flex;
  }
  .menu {
    flex-direction: column;
    gap: 15px;
  }
  .menu-box a {
    font-size: 16px;
    color: #333;
  }
}