.register-container {
    background: #fff;
    padding: 20px 25px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 350px;
}

.register-container h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

/* กล่องอินพุต */
.input-group-register {
    position: relative;
    margin: 10px;
}

.input-group-register input {
    width: 90%;
    padding: 12px 15px;
    border: none;
    border-radius: 25px;
    background-color: #f2f7ff;
    box-shadow: inset 0 2px 5px var(--shadow-color);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.input-group-register input:focus {
    background-color: #e6f3ff;
    box-shadow: 0 0 8px var(--primary-color);
}

.input-group-register i {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    cursor: pointer;
    transition: color 0.3s;
}

.input-group-register i:hover {
    color: var(--primary-color);
}

.error-message {
    color: red;
    font-size: 14px;
    text-align: center;
}

.success-message {
    color: rgb(0, 19, 128);
    font-size: 14px;
    text-align: center;
}