/* =================== FORM NGƯỜI DÙNG (Đăng nhập / Đăng ký) =================== */
body {
    background: linear-gradient(135deg, #fff5f0, #ffe9e0);
    font-family: "Poppins", "Segoe UI", Arial, sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
}

.user-form {
    max-width: 420px;
    background-color: #fff;
    margin: 70px auto;
    padding: 35px 40px;
    border-radius: 16px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.6s ease;
}

    .user-form h2 {
        text-align: center;
        color: #ff5722;
        font-weight: 700;
        margin-bottom: 25px;
        letter-spacing: 0.5px;
    }

.form-group {
    margin-bottom: 18px;
}

    .form-group label {
        font-weight: 500;
        display: block;
        margin-bottom: 6px;
        color: #444;
    }

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.95em;
    transition: all 0.3s ease;
}

    .form-control:focus {
        border-color: #ff5722;
        box-shadow: 0 0 5px rgba(255, 87, 34, 0.3);
        outline: none;
    }

.btn {
    border: none;
    padding: 10px 0;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-warning {
    background: linear-gradient(90deg, #ff9800, #ff5722);
    color: white;
}

    .btn-warning:hover {
        background: linear-gradient(90deg, #ff7b00, #ff3d00);
    }

.alert {
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9em;
    margin-bottom: 12px;
}

.alert-danger {
    background-color: #ffe0e0;
    color: #c62828;
    border: 1px solid #f5b5b5;
}

.alert-success {
    background-color: #e9f7ef;
    color: #2e7d32;
    border: 1px solid #b2dfdb;
}

.mt-3 {
    margin-top: 1rem;
}

.text-center {
    text-align: center;
}

a {
    color: #ff5722;
    text-decoration: none;
    font-weight: 500;
}

    a:hover {
        text-decoration: underline;
    }

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 480px) {
    .user-form {
        width: 90%;
        padding: 25px;
    }

    .btn {
        font-size: 0.95em;
    }
}