* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1b262c, #0f4c75, #3282b8);
  background-size: 200% 200%;
  animation: bgMove 15s ease infinite;
}

@keyframes bgMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.glass-card {
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 0px solid #bbe1fa;
  border-radius: 16px;
  box-shadow: 0 5px 32px rgba(0,0,0,0.05);
  background-image: linear-gradient(135deg, 
    #0f4c754D, 
    #3282b84D
  );
  padding: 40px 35px;
  width: 100%;
  max-width: 420px;
  color: white;
}

.card-title {
  text-align: center;
  font-size: 26px;
  margin-bottom: 30px;
  font-weight: bold;
}

.tab-group {
  display: flex;
  margin-bottom: 25px;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(255,255,255,0.15);
}
.tab {
  flex: 1;
  padding: 12px 0;
  text-align: center;
  cursor: pointer;
  transition: 0.3s;
}
.tab.active {
  background: rgba(255,255,255,0.3);
}

.form-item {
  margin-bottom: 20px;
}
.form-item label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
}
.form-item input {
  width: 100%;
  padding: 12px 15px;
  border-radius: 10px;
  border: none;
  outline: none;
  background: rgba(255,255,255,0.2);
  color: white;
  font-size: 15px;
  backdrop-filter: blur(5px);
}
.form-item input::placeholder {
  color: rgba(255,255,255,0.7);
}

.submit-btn {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  border: none;
  background: rgba(255,255,255,0.3);
  color: white;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
  margin-top: 10px;
}
.submit-btn:hover {
  background: rgba(255,255,255,0.45);
}

.form-panel {
  display: none;
}
.form-panel.show {
  display: block;
}