:root {
    --fond-haut: #f8fbfe;
    --fond-bas: #dce7f2;
    --texte: #172238;
    --texte-doux: #68788c;

    /* VITESSES DES DESCRIPTIONS */
    --description-apparition: 180ms;
    --description-disparition: 240ms;

    /* VITESSE DES EFFETS DE SURVOL */
    --survol-projet: 220ms;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

html { background: var(--fond-bas); }

body {
    margin: 0;
	overflow-x: hidden;
	overflow-y: auto;
    color: var(--texte);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background:
        radial-gradient(circle at 50% 44%, rgba(255,255,255,.98) 0 12%, rgba(255,255,255,.76) 31%, transparent 60%),
        linear-gradient(180deg, var(--fond-haut) 0%, #edf4f9 46%, var(--fond-bas) 100%);
}

#champ-etoiles {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.scene {
    position: relative;
    z-index: 1;
    min-height: 100svh;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    padding: 18px 24px 12px;
}

.constellation {
    position: relative;
    width: min(1260px, 100%);
    min-height: 620px;
    margin: auto;
}

.coeur {
    position: absolute;
    z-index: 5;
    left: 50%;
    top: 50%;
    width: min(560px, 52vw);
    display: flex;
    align-items: center;
    flex-direction: column;
    text-align: center;
    transform: translate(-50%, -50%);
}

.logo-constellation {
    display: block;
    width: min(600px, 58vw);
    max-height: 220px;
    object-fit: contain;

    filter: drop-shadow(0 12px 28px rgba(41, 60, 83, .11));

    transition:
        transform 260ms cubic-bezier(.2,.8,.2,1),
        filter 260ms ease,
        opacity 180ms ease;
}

.constellation.projet-actif .logo-constellation {
    transform: scale(1.018);
    opacity: 0.83;
    filter:
        blur(1px)
        drop-shadow(0 14px 32px rgba(41,60,83,.10));
}

.logo-constellation.logo-manquant { display: none; }

.logo-secours-constellation {
    display: none;
    align-items: center;
    gap: 18px;
    font-size: clamp(38px, 5vw, 70px);
    line-height: 1;
    letter-spacing: -.055em;
}

.logo-constellation.logo-manquant + .logo-secours-constellation { display: flex; }

.mini-constellation { position: relative; width: 58px; height: 58px; }
.mini-constellation::before,
.mini-constellation::after {
    position: absolute;
    border-radius: 50%;
    content: "";
}
.mini-constellation::before {
    left: 23px; top: 9px; width: 15px; height: 15px;
    background: #2b7ec0;
    box-shadow:
        -21px 20px 0 -3px #5b9bcc,
        24px 17px 0 -3px #2fb7ba,
        0 36px 0 -3px #efa05b;
}
.mini-constellation::after {
    left: 11px; top: 19px; width: 39px; height: 27px;
    border-top: 1px solid #7ca4c7;
    border-bottom: 1px solid #7ca4c7;
    transform: rotate(16deg);
}

.phrase-canonique {
    margin: 18px 0 0;
    color: var(--texte-doux);
    font-size: clamp(14px, 1.45vw, 19px);
    letter-spacing: .018em;
}

.zone-logo {
    position: relative;
    display: inline-block;
    isolation: isolate;
}

.description-projet {
    position: absolute;
    z-index: 2;
    inset: 0;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    padding: 34px 48px;
    text-align: center;

    opacity: 0;
    transform: scale(.97);

    pointer-events: none;

    border-radius: 28px;

    background:
        radial-gradient(
            circle at center,
            rgba(255, 255, 255, .92) 0%,
            rgba(255, 255, 255, .72) 48%,
            rgba(255, 255, 255, 0) 82%
        );

    transition:
        opacity var(--description-disparition) ease,
        transform var(--description-disparition) ease;
}

.description-projet.visible {
    opacity: 1;
    transform: scale(1);

    transition-duration: var(--description-apparition);
}

.description-projet strong {
    color: var(--description-couleur, var(--texte));

    font-size: clamp(28px, 3vw, 42px);
    font-weight: 750;
    line-height: 1.1;
    letter-spacing: -.025em;

    text-shadow:
        0 2px 0 rgba(255, 255, 255, .9),
        0 5px 18px rgba(23, 34, 56, .12);
}

.description-projet span {
    max-width: 470px;
    margin-top: 12px;

    color: #35445a;

    font-size: clamp(17px, 1.65vw, 22px);
    font-weight: 520;
    line-height: 1.42;

    text-shadow:
        0 1px 0 rgba(255, 255, 255, 1),
        0 3px 12px rgba(23, 34, 56, .10);
}

.projet {
    position: absolute;
    z-index: 3;
    width: var(--taille);
    display: flex;
    align-items: center;
    flex-direction: column;
    color: inherit;
    text-decoration: none;
    transform: translate(-50%, -50%);
    outline: none;
    will-change: left, top, opacity;
    transition:
        opacity 300ms ease,
        filter 300ms ease;
}

.constellation.projet-actif .projet:not(.actif) {
    opacity: .42;
    filter: saturate(.72);
}

.bulle-logo {
    position: relative;
    width: var(--taille);
    height: var(--taille);
    display: grid;
    place-items: center;
    border-radius: 32%;
    background: rgba(255,255,255,.76);
    box-shadow:
        0 15px 38px rgba(43,63,87,.12),
        inset 0 0 0 1px rgba(255,255,255,.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition:
        transform var(--survol-projet) cubic-bezier(.2,.8,.2,1),
        box-shadow var(--survol-projet) ease,
        background-color var(--survol-projet) ease;
}

.bulle-logo img {
    display: block;
    width: 90%;
    height: 90%;
    border-radius: 26%;
    object-fit: contain;
    user-select: none;
}

.halo-logo {
    position: absolute;
    z-index: -1;
    inset: 4%;
    border-radius: 50%;
    opacity: .11;
    background: var(--accent);
    filter: blur(28px);
    transform: scale(.72);
    transition:
        opacity var(--survol-projet) ease,
        transform var(--survol-projet) ease;
}

.logo-secours {
    display: none;
    color: var(--accent);
    font-size: calc(var(--taille) * .44);
    font-weight: 760;
}

.bulle-logo.logo-absent .logo-secours { display: block; }

.nom-projet {
    margin-top: 8px;
    padding: 4px 10px;
    border-radius: 999px;
    color: color-mix(in srgb, var(--accent) 82%, #172238);
    background: rgba(255,255,255,.68);
    font-size: 14px;
    font-weight: 740;
    white-space: nowrap;
    opacity: 0;
    transform: translateY(-5px);
    transition:
        opacity 150ms ease,
        transform 180ms ease;
}

.projet:hover,
.projet:focus-visible,
.projet.actif {
    z-index: 8;
}

.projet:hover .bulle-logo,
.projet:focus-visible .bulle-logo,
.projet.actif .bulle-logo {
    transform: scale(1.08);
    background: rgba(255,255,255,.95);
    box-shadow:
        0 24px 55px color-mix(in srgb, var(--accent) 19%, rgba(43,63,87,.12)),
        0 0 0 7px color-mix(in srgb, var(--accent) 9%, transparent),
        inset 0 0 0 1px rgba(255,255,255,.98);
}

.projet:hover .halo-logo,
.projet:focus-visible .halo-logo,
.projet.actif .halo-logo {
    opacity: .34;
    transform: scale(1.08);
}

.projet:hover .nom-projet,
.projet:focus-visible .nom-projet,
.projet.actif .nom-projet {
    opacity: 1;
    transform: translateY(0);
}

.footer-institutionnel {
    position: relative;

    width: min(1180px, calc(100% - 48px));
    margin: 20px auto 0;
    padding: 18px 26px 12px;

    display: grid;
    grid-template-columns: 190px minmax(0, 1fr) 150px;
    align-items: center;
    gap: 32px;

    border-top: 1px solid rgba(71, 91, 115, .14);

    color: #657589;
    text-align: left;
}

.footer-logo {
    display: flex;
    align-items: center;
}

.footer-logo img {
    display: block;
    max-width: 100%;
    object-fit: contain;
    opacity: .82;

    transition:
        opacity 200ms ease,
        transform 200ms ease;
}

.footer-logo img:hover {
    opacity: 1;
    transform: scale(1.02);
}

.footer-logo-iut {
    justify-content: flex-start;
}

.footer-logo-iut img {
    width: 180px;
    max-height: 54px;
}

.footer-logo-universite {
    justify-content: flex-end;
}

.footer-logo-universite img {
    width: 135px;
    max-height: 58px;
}

.footer-contenu {
    max-width: 650px;
    margin: 0 auto;
}

.footer-contenu p {
    margin: 0;

    color: #66768a;

    font-size: 12px;
    font-weight: 430;
    line-height: 1.55;
}

.footer-contenu strong {
    color: #2f6f9f;
    font-weight: 720;
}

@media (max-width: 930px), (max-height: 700px) {
    .constellation { min-height: 530px; }
    .coeur { width: min(480px, 56vw); }
    .logo-constellation { width: min(360px, 48vw); max-height: 130px; }
    .projet { --taille-responsive: clamp(82px, 12vw, 105px); width: var(--taille-responsive); }
    .bulle-logo { width: var(--taille-responsive); height: var(--taille-responsive); }
    .nom-projet { font-size: 12px; }
}

@media (max-width: 680px) {
    body { overflow-y: auto; }
    .scene { min-height: 760px; padding-inline: 12px; }
    .constellation { min-height: 700px; }
    .coeur { width: min(88vw, 440px); }
    .logo-constellation { width: min(78vw, 360px); }
    .projet { --taille-responsive: 88px; }
    .description-projet { min-height: 92px; }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 1ms !important;
    }
}

@media (max-width: 850px) {
    .footer-institutionnel {
        width: min(100% - 24px, 680px);

        grid-template-columns: 1fr 1fr;
        gap: 16px 24px;

        padding-inline: 12px;
    }

    .footer-contenu {
        grid-column: 1 / -1;
        grid-row: 1;

        max-width: 600px;

        text-align: center;
    }

    .footer-logo-iut {
        justify-content: flex-end;
    }

    .footer-logo-universite {
        justify-content: flex-start;
    }

    .footer-logo-iut img {
        width: 155px;
    }

    .footer-logo-universite img {
        width: 115px;
    }
}

@media (max-width: 520px) {
    .footer-institutionnel {
        display: flex;
        flex-direction: column;
        gap: 14px;

        padding-top: 16px;
    }

    .footer-contenu {
        order: 1;
    }

    .footer-logo-iut {
        order: 2;
    }

    .footer-logo-universite {
        order: 3;
    }

    .footer-contenu p {
        font-size: 11px;
    }

    .footer-logo-iut img {
        width: 145px;
    }

    .footer-logo-universite img {
        width: 105px;
    }
}

/* ===== Division de la page : scène à gauche, accès rapide à droite ===== */

.page-constellation {
    position: relative;
    z-index: 1;
    min-height: 100svh;
    display: grid;
    grid-template-columns: minmax(0, 87fr) minmax(190px, 13fr);
}

.page-principale {
    min-width: 0;
}

.page-principale .scene {
    min-height: 100svh;
}

.menu-projets {
    position: sticky;
    top: 0;
    height: 100svh;
    min-width: 0;
    padding: 30px 18px 24px;
    overflow-y: auto;
    border-left: 1px solid rgba(71, 91, 115, .13);
    background:
        linear-gradient(
            180deg,
            rgba(255, 255, 255, .72),
            rgba(242, 247, 251, .78)
        );
    box-shadow: -12px 0 35px rgba(49, 72, 98, .045);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.menu-projets-entete {
    margin-bottom: 18px;
    padding: 0 4px 15px;
    border-bottom: 1px solid rgba(71, 91, 115, .10);
}

.menu-projets-sur-titre {
    display: block;
    margin-bottom: 3px;
    color: #8795a6;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .13em;
    text-transform: uppercase;
}

.menu-projets-entete h2 {
    margin: 0;
    color: #27374d;
    font-size: clamp(18px, 1.35vw, 22px);
    font-weight: 730;
    letter-spacing: -.025em;
}

.menu-projets-liste {
    display: flex;
    flex-direction: column;
}

.menu-projet {
    position: relative;
    display: grid;
    grid-template-columns: 4px minmax(0, 1fr) auto;
    align-items: start;
    gap: 10px;
    padding: 15px 4px;
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid rgba(71, 91, 115, .095);
    transition:
        transform 180ms ease,
        opacity 180ms ease;
}

.menu-projet-marque {
    width: 4px;
    height: 100%;
    min-height: 40px;
    border-radius: 999px;
    background: var(--accent-menu);
    opacity: .72;
    transition:
        opacity 180ms ease,
        transform 180ms ease;
}

.menu-projet-contenu {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.menu-projet-contenu strong {
    color: color-mix(in srgb, var(--accent-menu) 76%, #26364c);
    font-size: 14px;
    font-weight: 750;
    line-height: 1.2;
}

.menu-projet-contenu span {
    color: #6d7c8f;
    font-size: 11px;
    font-weight: 430;
    line-height: 1.45;
}

.menu-projet-fleche {
    align-self: center;
    color: var(--accent-menu);
    font-size: 15px;
    opacity: 0;
    transform: translateX(-5px);
    transition:
        opacity 180ms ease,
        transform 180ms ease;
}

.menu-projet:hover,
.menu-projet:focus-visible {
    transform: translateX(3px);
    outline: none;
}

.menu-projet:hover .menu-projet-marque,
.menu-projet:focus-visible .menu-projet-marque {
    opacity: 1;
    transform: scaleY(1.06);
}

.menu-projet:hover .menu-projet-fleche,
.menu-projet:focus-visible .menu-projet-fleche {
    opacity: 1;
    transform: translateX(0);
}

#champ-etoiles {
    z-index: 0;
}

@media (max-width: 1180px) {
    .page-constellation {
        grid-template-columns: minmax(0, 84fr) minmax(205px, 16fr);
    }

    .menu-projets {
        padding-inline: 14px;
    }
}

@media (max-width: 850px) {
    .page-constellation {
        display: block;
    }

    .menu-projets {
        position: relative;
        width: 100%;
        height: auto;
        padding: 22px 18px 28px;
        border-top: 1px solid rgba(71, 91, 115, .13);
        border-left: 0;
        box-shadow: 0 -12px 35px rgba(49, 72, 98, .045);
    }

    .menu-projets-liste {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        column-gap: 22px;
    }
}

@media (max-width: 540px) {
    .menu-projets-liste {
        display: flex;
    }
}