.site-header {
  position: fixed; top: 0; left: 0; right: 0; width: 100%; z-index: 200;
  background: #5e17eb; height: 68px; padding: 0 60px;
  display: flex; align-items: center; gap: 32px;
}
.site-header .logo img { height: 36px; width: auto; display: block; }
.site-header nav { margin-left: auto; }
.site-header nav ul { list-style: none; display: flex; gap: 32px; margin: 0; padding: 0; }
.site-header nav ul li a { font-size: 14px; font-weight: 500; color: rgba(255,255,255,0.88); transition: color 0.2s; text-decoration: none; }
.site-header nav ul li a:hover { color: #ffffff; }
.site-header .login-btn {
  padding: 10px 28px; background: rgba(255,255,255,0.15); color: #ffffff;
  border: 1px solid rgba(255,255,255,0.3); border-radius: 50px;
  font-size: 14px; font-weight: 600; text-decoration: none; transition: all 0.2s;
}
.site-header .login-btn:hover { background: #ffffff; color: #5e17eb; }
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; margin-left: auto; }
.hamburger span { display: block; width: 24px; height: 2px; background: #ffffff; border-radius: 2px; transition: 0.2s; }
.mobile-nav {
  display: none; position: fixed; top: 68px; left: 0; right: 0;
  background: rgba(255,255,255,0.78);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  z-index: 199; flex-direction: column;
  border-bottom: 3px solid #5e17eb; box-shadow: 0 10px 24px rgba(0,0,0,0.12);
}
.mobile-nav.open { display: flex; }
.mobile-nav ul { list-style: none; margin: 0; padding: 0; }
.mobile-nav ul li a {
  display: block; padding: 15px 24px; font-size: 16px; font-weight: 500;
  color: #1a0a33; text-decoration: none; border-bottom: 0.5px solid #eee;
  text-align: center;
}
.mobile-nav ul li a:active { background: rgba(94,23,235,0.06); }
.mobile-nav .mobile-login {
  display: block; margin: 16px 24px 20px; padding: 14px; text-align: center;
  background: #5e17eb; color: #ffffff; font-size: 16px; font-weight: 600;
  border-radius: 50px; text-decoration: none;
}
@media (max-width: 900px) {
  .site-header { padding: 0 24px; }
  .site-header nav { display: none; }
  .site-header .login-btn { display: none; }
  .hamburger { display: flex; }
}