/* fonts Poppins */

@font-face {
    font-family: Poppins;
    src: url(../fonts/Poppins-Regular.ttf);
    font-weight: normal;
}

@font-face {
    font-family: Poppins;
    src: url(../fonts/Poppins-ExtraBold.ttf);
    font-weight: bold;
}

/* CSS reset */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

/* Styles */

:root {
    --black: #414042;
    --purple: #cb6ce6;
    --blue: #0cc0df;
    --green: #00bf63;
    --orange: #ff914d;
    --yellow: #c1ff72;
    --red: #ff5757;
    --button-blue: #337ab7;
}

html {
    font-size: 62.5%;
    font-family: 'Poppins', 'Verdana';
}

body {
    min-height: 100vh;
    background-image: url(../images/background.png);
    padding-top: 70px;
    display: flex;
    flex-direction: column;
}

/* nav */

.application-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1;
    box-shadow: 0 0 10px var(--black);
    border-radius: 0 0 10px 10px;
    background-color: white;
}

.application-navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 20px;
}

.bar-menu {
    display: none;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    -webkit-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
    background-color: var(--black);
}

.nav-menu {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-item {
    margin-left: 5rem;
}

.nav-link {
    font-size: 2rem;
    font-weight: 500;
    color: var(--black);
}

.nav-link:hover {
    color: var(--orange);
}

.nav-logo {
    font-size: 3rem;
    font-weight: 500;
}

.nav-logo .bracket-right {
    color: var(--black);
}

.nav-logo .bracket-left {
    color: var(--black);
}

.nav-logo .c1 {
    color: var(--purple);
}

.nav-logo .a1 {
    color: var(--blue);
}

.nav-logo .l1 {
    color: var(--green);
}

.nav-logo .c2 {
    color: var(--orange);
}

.nav-logo .u {
    color: var(--yellow);
}

.nav-logo .l2 {
    color: var(--red);
}

.nav-logo .a2 {
    color: var(--purple);
}

.nav-logo .t {
    color: var(--blue);
}

.nav-logo .o {
    color: var(--green);
}

.nav-logo .r {
    color: var(--orange);
}

/* footer */

.application-footer {
    margin-top: auto;
    background: var(--black);
    text-align: center;
    height: 100px;
    color: white;
    width: 100%;
    padding: 50px 0 0 0;
    clip-path: polygon(0 30px, 100% 0, 100% 100%, 0 100%);
}

.application-footer>p {
    font-size: 1.2rem;
}

/* index page */

.index-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
}

.index-article {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    border: .1rem solid rgba(0, 0, 0, .2);
    box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .2);
    border-radius: 50px;
    padding: 0 30px;
    background-color: white;
}

.index-article h2 {
    margin: 0.8rem;
    font-size: 5rem;
}

.index-article p {
    margin: 0.8rem;
    font-size: 3rem;
}

/* calculator forms */

.container {
    margin: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    flex: 1;
}

.article-container {
    background-color: white;
    border: .1rem solid rgba(0, 0, 0, .2);
    box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .2);
    border-radius: 50px;
    padding: 30px;
    width: 50vh;
    height: auto;
}

.article-container h2 {
    text-align: center;
    padding-bottom: 2rem;
    font-size: 3rem;
}

.section-container form {
    display: flex;
    flex-direction: column;
}

.section-container label {
    margin-bottom: 10px;
    font-size: 2rem;
    text-align: left;
}

.section-container input[type="text"],
.section-container select {
    width: 100%;
    padding: 5px;
    border-radius: 3px;
    border: .1rem solid rgba(0, 0, 0, .2);
}

.section-container input[type="number"] {
    margin: 10px;
    padding: 8px 16px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    width: 70px;
    border: .1rem solid rgba(0, 0, 0, .2);
}

.button-container p {
    font-size: 1.3rem;
}

.section-container input[type="submit"],
.section-container input[type="button"] {
    margin: 10px;
    padding: 8px 16px;
    background-color: var(--button-blue);
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    width: 100px;
}

.section-container {
    text-align: center;
    margin: 10px;
}

.section-container input[type="submit"]:hover,
.section-container input[type="button"]:hover {
    filter: brightness(115%) contrast(85%);
}

.section-container input[type="number"]:hover,
.section-container input[type="text"]:hover,
.result-container .result-textarea:hover,
.section-container .operation:hover {
    border: .1rem solid var(--orange);
    cursor: pointer;
}

.section-container input[type="submit"]:focus,
.section-container input[type="button"]:focus {
    outline: none;
}

.result-container p {
    text-align: left;
    margin-bottom: 10px;
    font-size: 2rem;
}

.result-container .result-textarea {
    min-width: 100%;
    padding: 5px;
    border-radius: 3px;
    border: .1rem solid rgba(0, 0, 0, .2);
    min-height: 35px;
    word-wrap: break-word;
    font-size: 1.5rem;
}

.article-container .example {
    font-size: 1.3rem;
    text-align: center;
}

.container .error-image {
    width: 50%;
}

.result-container {
    position:relative;
}

.result-container .error{
    position: absolute;
    top: 40px;
    left: 0px;
    width: 100%;
    padding: 5px;
    border-radius: 3px;
    border: .1rem solid red;
    background-color: lightpink;
    color: red;
    min-height: 35px;
    font-size: 1.5rem;
    overflow-x: hidden;
}

/* breakpoints */

@media only screen and (max-width: 990px) {

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 7rem;
        flex-direction: column;
        background-image: url(../images/background.png);
        border: .1rem solid rgba(0, 0, 0, .2);
        box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .2);
        width: 100%;
        border-radius: 10px;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 2.5rem 0;
    }

    .bar-menu {
        display: block;
        cursor: pointer;
    }

    .index-article h2 {
        margin-left: 2rem;
        font-size: 3.5rem;
    }

    .index-article p {
        font-size: 2.5rem;
        margin: 0.8rem;
    }

    /* X icon menu animation */

    .bar-menu.active .bar:nth-child(2) {
        opacity: 0;
    }

    .bar-menu.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .bar-menu.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .container .error-image {
            width: 70%;
        }

}

@media only screen and (max-width: 680px) {

    .index-article {
        flex-direction: column;
        padding: 0 2rem;
    }

    .index-article h2 {
        margin-left: 2rem;
        font-size: 3rem;
    }

    .index-article p {
        font-size: 2.2rem;
        margin: 0.8rem;
    }

    .container .error-image {
            width: 80%;
        }
}


@media only screen and (max-width: 450px) {

    .nav-logo {
        font-size: 2.5rem;
        font-weight: 500;
    }

    .index-article {
        flex-direction: column;
        gap: 0px;
        padding: 0 2rem;
    }

    .index-article h2 {
        margin-left: 2.3rem;
        font-size: 2.5rem;
    }

    .index-article p {
        font-size: 2rem;
        margin: 0.8rem;
    }

    .basic-article h2 {
        text-align: center;
        padding-bottom: 2rem;
        font-size: 2rem;
    }

    .basic-section label {
        display: flex;
        flex-direction: column;
    }

    .article-container h2 {
        text-align: center;
        padding-bottom: 2rem;
        font-size: 2rem;
    }

    .container .error-image {
            width: 100%;
        }
}

@media only screen and (max-width: 380px) {

    .nav-logo {
        font-size: 1.7rem;
        font-weight: 500;
    }

    .index-article h2 {
        margin-left: 1.3rem;
        font-size: 2.5rem;
    }

    .index-article p {
        font-size: 1.3rem;
        margin: 0.8rem;
    }
}