/* Wrapper toàn trang */
.main-wrapper {
    background: linear-gradient(to top, #825f35, #f7941d);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Khung form */
.form-container {
    background: rgba(0,0,0,0.6);
    padding: 30px 25px;
    border-radius: 15px;
    width: 350px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    color: #fff;
}

/* Tiêu đề */
.main-wrapper h1 {
    text-align: center;
    color: #fff;
    margin-bottom: 25px;
    font-size: 28px;
}

.form-container h2 {
    color: #f0f0f0;
    font-size: 18px;
    margin-bottom: 15px;
}

/* Input fields */
.form-container input[type="email"],
.form-container input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 15px;
    border: none;
    border-radius: 8px;
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-size: 14px;
}

.form-container input::placeholder {
    color: #e0e0e0;
}

/* Buttons */
.send-email, .send-otp {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background-color: #f7941d;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.send-email:hover, .send-otp:hover {
    background-color: #ffb347;
}

/* Message hiển thị lỗi / thành công */
.message {
    min-height: 20px;
    margin-bottom: 10px;
    font-size: 14px;
    color: lightgreen;
}

/* Form OTP ẩn ban đầu */
.otp-form {
    display: none;
}
.lds-dual-ring {
  display: inline-block;
  width: 64px;
  height: 64px;
}
.lds-dual-ring:after {
  content: " ";
  display: block;
  width: 46px;
  height: 46px;
  margin: 1px;
  border-radius: 50%;
  border: 5px solid #3498db;
  border-color: #3498db transparent #3498db transparent;
  animation: lds-dual-ring 1.2s linear infinite;
}
@keyframes lds-dual-ring {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}