@import url('https://fonts.cdnfonts.com/css/quivira');
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Old+Italic&family=Noto+Sans+Psalter+Pahlavi&display=swap');

:root {
    --bg-opacity: 0.7;
    --bg-color-transparent: rgba(0, 0, 0, var(--bg-opacity));
    --text-color: ivory;
    --border-radius-normal: 10px;
    --border-radius-large: 20px;
    --main-padding: 2vh 2vw;
    --hover-shadow: 0px 0px 5px ivory;
    --error-color: red;
    --error-shadow: 0px 0px 5px red;
}

* {
    background-color: transparent;
    color: var(--text-color);
    border: none;
    font-family: "Quivira", sans-serif;
    box-sizing: border-box;
}

html {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 100vh;
}

body {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

/* Cabeçalho */
header {
    width: 100%;
    height: 12vh;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-color-transparent);
    padding: 0 3vw;
}

#nav-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1vw;
    padding: 0;
}

#nav-list li {
    display: inline;
}

.nav-btn {
    border: 1px solid var(--text-color);
    border-radius: var(--border-radius-normal);
    padding: 10px;
    cursor: pointer;
    transition: box-shadow 0.3s ease;
}

.nav-btn:hover {
    box-shadow: var(--hover-shadow);
}

/* Conteúdo principal */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2vh 0;
}

.main {
    border-radius: var(--border-radius-large);
    border: 1px solid var(--text-color);
    background-color: var(--bg-color-transparent);
    padding: var(--main-padding);
}

#inputDiv {
    display: flex;
    margin-top: 2vh;
}

#input {
    border-radius: var(--border-radius-large) 0 0 var(--border-radius-large);
    border-right: none;
    width: 275px;
    font-size: large;
    padding: var(--main-padding);
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

#input:hover {
    box-shadow: var(--hover-shadow);
}

#input:focus {
    outline: none;
    background-color: rgba(0, 0, 0, 0.8);
}

/* Remove as setas do input number */
#input::-webkit-inner-spin-button,
#input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

#input[type=number] {
    -moz-appearance: textfield;
}

#ajuda {
    text-decoration: none;
    border-radius: 0 var(--border-radius-large) var(--border-radius-large) 0;
    border-left: none;
    display: flex;
    align-items: center;
    padding: var(--main-padding);
    transition: box-shadow 0.3s ease;
}

#ajuda:hover {
    box-shadow: var(--hover-shadow);
}

#resultado {
    visibility: hidden;
    display: flex;
    align-items: center;
    margin-bottom: 5vh;
    font-size: x-large;
    min-height: 60px;
    min-width: 250px;
    text-align: center;
    justify-content: center;
}

/* Rodapé */
footer {
    width: 100%;
    display: flex;
    height: 12vh;
    justify-content: space-around;
    align-items: center;
    background: var(--bg-color-transparent);
    flex-wrap: wrap;
}

footer a {
    font-size: small;
    text-decoration: none;
    transition: text-shadow 0.3s ease;
}

footer a:hover {
    text-shadow: var(--hover-shadow);
}

/* Responsividade */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        height: auto;
        padding: 2vh 0;
    }
    
    #nav-list {
        justify-content: center;
        margin-top: 2vh;
    }
    
    footer {
        flex-direction: column;
        height: auto;
        padding: 2vh 0;
        gap: 1vh;
    }
}