input-material($params) {
    .input {
        border-radius: 0;
        border: none;
        padding: 0;

        &::-webkit-input-placeholder {
            color:#777777;
            opacity: 0.6;
            transition: opacity 0.3s ease;
        }
        &::-moz-placeholder {
            color:#777777;
            opacity: 0.6;
            transition: opacity 0.3s ease;
        }

        &:focus {
            position: relative;
            z-index: 3;

            &::-webkit-input-placeholder {
                opacity: 0;
            }
            &::-moz-placeholder {
                opacity: 0;
            }
        }    
    }

    .input {
        background: $params.default.bg;
        color: $params.default.color;
        border-radius: $params.default.radius;
        border-bottom: 1px solid $params.default.border;
    }
    &:after {
        display: block;
        left: 50%;
        width: 0;
        background: $params.default.border;
        height: 1px;
        bottom: 0;
        position: absolute;
        transition: left 0.2s ease, width 0.2s ease;
        content: "";
        z-index: 4;
    }

    &.focus {
        .input {
            background: $params.focus.bg;
            color: $params.focus.color;
            border-radius: $params.focus.radius;
        }
        &:after {
            width: 100%;
            left: 0;
            background: $params.focus.border
        }
    }
    &.valid {
        .input {
            background: $params.valid.bg;
            color: $params.valid.color;
            border-radius: $params.valid.radius;
        }
        &:after {
            width: 100%;
            left: 0;
            background: $params.valid.border
        }
        .input-msg {
            border-left: 2px solid $params.valid.border;
        }
    }
    &.error {
        .input {
            background: $params.error.bg;
            color: $params.error.color;
            border-radius: $params.error.radius;
        }
        &:after {
            width: 100%;
            left: 0;
            background: $params.error.border
        }
        .input-msg {
            border-left: 2px solid $params.error.border;
            color: $params.error.border;
        }
    }
    .input-msg {
        position: absolute;
        left: 100%;
        margin: 0 0 0 15px;
        bottom: 0;
        padding: 15px;
        background: #FFFFFF;
        z-index: 20;
    }
}