:root {
    /*couleurs*/
    --white-color: #ffffff;
    --black-color: #000000;
    --A-color: #16232A;
    --B-color: #075056;
    --C-color: #0095A1;
    /*fonts*/
    --font-sans-serif: "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-serif: Georgia, serif;
}

body {
    margin: 0; /* Supprime les marges par défaut */
    padding: 0; /* Supprime le padding par défaut */
    width: 100%; /* Permet de s'adapter à la largeur de la fenêtre */
    margin-left: auto; /* Centre horizontalement si plus petit que 1440px */
    margin-right: auto; /* Centre horizontalement si plus petit que 1440px */
    box-sizing: border-box; /* Inclut le padding dans la largeur totale */
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* Assure que le corps occupe toute la hauteur de la fenêtre */
    background-color: var(--A-color);
}

main {
    flex: 1; /* Prend tout l'espace disponible pour pousser le footer vers le bas */
    padding: 2rem 6.5rem;
}

.pages-centrales {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 12rem;
}

.pages-centrales p {
    font-weight: 300;
    letter-spacing: 1px;
    color: var(--white-color);
}

:where(h1) {
    font-family: var(--font-sans-serif);
    font-size: 3.5em;
}

h2 {
    font-family: var(--font-sans-serif);
}

h3 {
    font-family: var(--font-sans-serif);
}

h3 {
    font-family: var(--font-sans-serif);
}

p {
    font-family: var(--font-sans-serif);
    color: var(--black-color);
    font-size: 18px;
    margin: 0;
}

a {
    font-family: var(--font-sans-serif);
    font-size: 18px;
    text-decoration: none;
    color: var(--white-color);
}
a:hover {
    color: var(--C-color);
}

li {
    font-family: var(--font-sans-serif);
}

@media (max-width: 745px) {
    main {
        padding: 1rem 2.5rem;
    }
    .pages-centrales {
        padding: 0 2.5rem;
    }
    .pages-centrales p {
        font-size: 16px;
    }
}



/***************************/
/********* FRONT PAGE ******/
/***************************/


.air-page {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.air-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    height: 100%;
}




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

.air-quality-title {
    color: var(--white-color);
    font-size: 3.5em;
    font-weight: 100;
    letter-spacing: 1px;
    margin: 0;
}

.air-quality-index {
    color: var(--white-color);
    font-size: 68px;
    font-weight: 700;
    text-transform: uppercase;
    margin: 0;
}




.air-quality-bar-container {
    position: relative;
    width: 90%;
    margin: auto;
    margin-top: 45px;
    margin-bottom: 65px;
}

.air-quality-bar-container p {
    font-size: 16px;
    margin-top: 12px;
    color: var(--white-color);
}

.air-quality-bar {
    display: flex;
    height: 15px;
    overflow: hidden;
    border-radius: 3px;
}

.air-quality-segment {
    flex: 1;
}

.air-quality-indicator {
    position: absolute;
    bottom: 125%; /* ← le triangle est au dessus de la barre */
    left: calc((var(--indicator-position) + 0.5) * (100% / 6));
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    border-top: 20px solid var(--white-color);
    border-radius: 0; /* ← garantit des bords droits */
}




.air-quality-5index {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 25px;
    width: 65%;
}

.air-quality-sub-index {
    border-radius: 25px;
    padding: 8px 25px;
    display: inline-block;
    text-align: center;
    font-size: 18px;
    font-weight: 200;
    letter-spacing: 1px;
    border: 1px solid var(--white-color);
    color: var(--white-color);
    margin: 0;
}


@media screen and (max-width: 725px) {
    .air-quality-title {
        font-size: 2em;
    }
    .air-quality-index {
        font-size: 48px;
    }
    .air-quality-bar-container {
        width: 100%;
        margin-top: 45px;
        margin-bottom: 45px;
    }
    .air-quality-bar-container p {
        font-size: 14px;
    }
    .air-quality-bar {
        height: 10px;
    }
    .air-quality-5index {
        gap: 12px;
        width: 95%;
    }

    .air-quality-sub-index {
        padding: 5px 12px;
        font-size: 14px;
    }
}

@media screen and (max-width: 473px) {
    .air-group {
        align-items: flex-start;
    }
    .air-quality-title {
        width: 80%;
    }
    .air-quality-index {
        font-size: 38px;
    }
    .air-quality {
        text-align: left;
    }
    .air-quality-5index {
        justify-content: flex-start;
        gap: 10px;
        width: 100%;
    }

    .air-quality-sub-index {
        padding: 2px 10px;
        font-size: 12px;
    }
}





/***************************/
/****** HEADER FOOTER ******/
/***************************/


/************/
/** HEADER **/
/************/


header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 96px;
    padding: 0 2.5rem;
}

header a {
    display: flex;
    justify-content: center;

}

#primary-menu {
    display: flex;
    align-items: flex-start;
    gap: 25px;
}

#primary-menu li {
    list-style-type: none;
}




/** BURGER **/


header button {
	border: 0;
	background-color: transparent;
}

.line {
	height: 3px;
	background-color: var(--white-color);
	display: block;
	margin-block: 2px;
	width: 20px;
}

.openMenu {
    opacity: 1;
    transform: translateY(0%);
    transition: all 0.25s ease-in;
}

.crossBurger span:nth-child(1) {
    transform: rotate(45deg) translate(2.5px, 5px);
}
.crossBurger span:nth-child(2) {
    opacity: 0;
}
.crossBurger span:nth-child(3) {
    transform: rotate(-45deg) translate(2.5px, -5px);
}

.no-scroll {
    overflow: hidden;
    height: 100vh;
}


/** RESPONSIVE **/


header button {
    display: none;
}

@media (max-width: 725px) {
    header {
        height: 96px;
        padding: 0;
    }
    header div {
        display: flex;
        z-index: 4;
        background-color: var(--A-color);
        align-items: center;
        justify-content: space-between;
        height: 96px;
        width: 100%;
        margin: 0;
        padding: 0 2.5rem;
    }
    header div a {
        display: flex;
        align-items: center;
    }
    header nav {
        display: flex;
        position: fixed;
        z-index: 2;
        top: 50px;
        left: 0;
        width: 100%;
        height: 93vh;
        background-color: var(--A-color);
        opacity: 0.5;
        transform: translateY(-115%);
        transition: all 0.25s ease-out;
    }
    header button {
        display: block;
    }
    #primary-menu {
        flex-direction: column;
        margin: auto;
        margin-left: 2.5rem;
        padding:0;
        gap: 45px;
    }
    #primary-menu li a {
        font-size: 24px;
    }
}




/************/
/** FOOTER **/
/************/




footer {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 92px;
    padding: 0 48px;
    background-color: var(--B-color);
    gap: 50px;
}

footer div p, a {
    font-size: 14px;
    color: var(--white-color);
}


/** RESPONSIVE **/


@media (max-width: 725px) {
    header div a {
        font-size: 16px;
    }
    footer {
        flex-direction: column;
        height: 92px;
        gap: 8px;
    }
    footer div p, a {
        font-size: 13px;
    }
}


@media screen and (max-width: 473px) {
    footer {
        align-items: flex-start;
    }
}