:root {
    --persian-blue: #1c45ba;
    --iron: #d5d7db;
    --tuatara: #343432;
    --tapa: #737372;
    --star-dust: #949493;
    --chetwode-blue: #829bd8;
    --fuscous-gray: #545452;
    --mine-shaft: #3f3f3f;
    --tundora: #4c4c4c;
}

body {
    background: linear-gradient(135deg, #e8ebf6 0%, #d5d7db 100%);
    font-family: 'DM Sans', sans-serif;
    color: var(--mine-shaft);
    margin: 0;
    padding: 0;
    position: relative;
}

html, body {
    max-width: 100vw;
    overflow-x: hidden !important;
    height: 100%;
    box-sizing: border-box;
}
/* Empêche tout débordement horizontal des enfants */
*,
*::before,
*::after {
    box-sizing: border-box;
}
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.main-content {
    flex: 1 0 auto;
}
.footer {
    flex-shrink: 0;
}

p {
    width: 100%;
    max-width: 600px;
    margin: 16px auto;
    font-size: 18px;
    line-height: 1.6;
    color: #555b6e;
    text-align: center;
}

a {
    color: #5f43e9;
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: #232946;
    text-decoration: underline;
    cursor: pointer;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-align: center;
    margin: 24px 0 12px 0;
    color: var(--persian-blue);
}

.navigation {
    width: 100%;
    min-height: 90px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    background: #1f2c6b;
    padding: 0 32px;
    box-shadow: 0 2px 8px rgba(35,41,70,0.07);
    position: relative;
    gap: 16px;
    position: relative;
}

#layer {
    position: absolute;
    top: 50%;
    left: 16px;
    width: 125px;   /* largeur réelle du logo */
    height: 75px;   /* hauteur réelle du logo */
    display: flex;
    align-items: center;
    justify-content: flex-start;
    z-index: 20;
    transform: translateY(-50%);
}

.blinking-link {
    position: absolute;
    top: 16px;
    right: 160px;
    width: auto;
    height: auto;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--persian-blue);
    background: #fff;
    padding: 6px 18px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(35,41,70,0.08);
    text-decoration: none;
    z-index: 10;
    transition: background 0.2s, color 0.2s;
}
.blinking-link:hover {
    background: var(--persian-blue);
    color: #fff;
    text-decoration: underline;
}

.contentup {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 32px;
}

.triangle {
        display: inline-block;
        width: 0; height: 0;
        border-top: 6px solid transparent;
        border-bottom: 6px solid transparent;
        border-left: 8px solid #673DE6;
        margin-right: 8px;
        transition: transform 0.2s;
        vertical-align: middle;
    }
.collapsible-btn.active .triangle {
        transform: rotate(90deg);
 }

.main-image {
    width: 100%;
    max-width: 420px;
    max-height: 260px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(35,41,70,0.08);
    margin-bottom: 24px;
}

.link-container {
    margin: 48px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.link {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1rem;
    color: var(--persian-blue);
    background: #fff;
    padding: 8px 18px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(35,41,70,0.07);
    margin-top: 8px;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}
.link:hover {
    background: var(--persian-blue);
    color: #fff;
}

.ic-launch  {
    margin-left: 10px;
    width: 21px !important;
    height: 20px !important;
}

.collapsible-allcontainer {
    width: 100%;
    display: flex;
    flex-direction: row;
    gap: 24px;
    margin: 0 auto;
    justify-content: center;
}

.collapsible-container {
    width: 100%;
    display: flex;
    margin: 0;
    padding: 0;
    margin-bottom: 18px;
    border-radius: 12px;
    /* box-shadow: 0 2px 12px #0001; */ /* Désactivé pour n'avoir de fond que sur le menu ouvert */
    overflow: visible;
    transition: box-shadow 0.2s;
    background: transparent !important;
    box-shadow: none !important;
}

.collapsible {
    width: var(--section-width, 85%);
    border: 1px solid var(--star-dust);
    border-radius: 8px;
    margin: 10px;
    box-sizing: border-box;
    background: #fff;
    box-shadow: 0 2px 8px rgba(35,41,70,0.05);
    transition: box-shadow 0.2s;
}

.collapsible-btn {
    width: 100%;
    background: linear-gradient(90deg, #e3eafc 0%, #f7faff 100%);
    color: #222;
    border: none;
    border-radius: 12px;
    outline: none;
    padding: 18px 24px;
    text-align: left;
    font-size: 1.15rem;
    font-family: 'DM Sans', sans-serif;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background 0.2s, color 0.2s;
    position: relative;
    border-bottom: 1px solid #e6e6e6;
}
.collapsible-btn.active,
.collapsible-btn:hover {
    background: linear-gradient(90deg, #d0e2ff 0%, #eaf3ff 100%);
    color: #0a3d62;
}
.collapsible-btn .triangle {
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 10px solid #4a6fa1;
    margin-right: 8px;
    transition: transform 0.3s cubic-bezier(.4,2,.6,1);
    transform: rotate(0deg);
}
.collapsible-btn.active .triangle {
    transform: rotate(135deg);
}
.collapsible .content {
    max-height: 0;
    overflow: hidden;
    background: transparent !important;
    transition: max-height 0.45s cubic-bezier(.4,2,.6,1), padding 0.3s, background 0.3s;
    padding: 0 !important;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}
.collapsible .content.open {
    padding: 16px 24px 24px 32px !important;
    max-height: 500px;
    background: #fff !important;
    box-shadow: 0 2px 12px #0001 !important;
    /* Large enough for content */
}
.collapsible .link {
    display: block;
    margin: 10px 0;
    color: #2563eb;
    text-decoration: none;
    font-size: 1.05rem;
    border-radius: 6px;
    padding: 7px 12px;
    transition: background 0.15s, color 0.15s;
}
.collapsible .link:hover {
    background: #e3eafc;
    color: #0a3d62;
}
@media (max-width: 600px) {
    .collapsible-btn { font-size: 1rem; padding: 14px 14px; }
    .collapsible .content.open { padding: 12px 10px 16px 18px; }
}

/* Modern Footer */
.footer {
    width: 100%;
    background: var(--tundora);
    color: #fff;
    padding: 24px 0 16px 0;
    text-align: center;
    margin-top: 48px;
    box-shadow: 0 -2px 8px rgba(35,41,70,0.07);
    font-size: 1rem;
}
.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.footer-link {
    color: var(--star-dust);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-link:hover {
    color: var(--persian-blue);
    text-decoration: underline;
}

/* Effet de fond animé : cercles flottants */
body::before {
    content: "";
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    pointer-events: none;
    /* Dégradé subtil en overlay */
    background: linear-gradient(120deg, #e8ebf6 0%, #d5d7db 100%);
    /* Ajoute une légère opacité pour voir le dégradé sous les cercles */
    opacity: 0.95;
}

/* Cercles animés */
.background-circles {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}
.background-circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.18;
    animation: float 16s linear infinite;
    background: var(--persian-blue);
    filter: blur(2px);
}
.background-circle.c1 { width: 180px; height: 180px; left: 10vw; top: 15vh; animation-delay: 0s; }
.background-circle.c2 { width: 120px; height: 120px; left: 70vw; top: 30vh; animation-delay: 4s; background: var(--chetwode-blue);}
.background-circle.c3 { width: 90px; height: 90px; left: 50vw; top: 70vh; animation-delay: 8s; background: var(--star-dust);}
.background-circle.c4 { width: 60px; height: 60px; left: 80vw; top: 80vh; animation-delay: 12s; background: var(--tapa);}
.background-circle.c5 { width: 140px; height: 140px; left: 25vw; top: 60vh; animation-delay: 2s; background: var(--persian-blue);}

@keyframes float {
    0% { transform: translateY(0) scale(1);}
    50% { transform: translateY(-40px) scale(1.08);}
    100% { transform: translateY(0) scale(1);}
}

/* Fond animé : triangles flottants */
.background-triangles {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}
.background-triangle {
    position: absolute;
    opacity: 0.13;
    animation: float-triangle 18s linear infinite;
    filter: blur(0.5px);
}
.background-triangle.t1 polygon { fill: var(--persian-blue); }
.background-triangle.t2 polygon { fill: var(--chetwode-blue); }
.background-triangle.t3 polygon { fill: var(--star-dust); }
.background-triangle.t4 polygon { fill: var(--tapa); }

@keyframes float-triangle {
    0%   { transform: translateY(0) scale(1) rotate(var(--angle,0deg)); }
    50%  { transform: translateY(-40px) scale(1.08) rotate(var(--angle,0deg)); }
    100% { transform: translateY(0) scale(1) rotate(var(--angle,0deg)); }
}

/* Fond animé : avions flottants */
.background-planes {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}
.background-plane {
    position: absolute;
    opacity: 0.16;
    animation: float-plane 18s linear infinite;
    filter: drop-shadow(0 2px 4px rgba(35,41,70,0.07));
    /* Optionnel : transition douce si tu veux */
    transition: opacity 0.3s;
}
.background-plane.p1 { filter: drop-shadow(0 0 2px var(--persian-blue)); }
.background-plane.p2 { filter: drop-shadow(0 0 2px var(--chetwode-blue)); }
.background-plane.p3 { filter: drop-shadow(0 0 2px var(--star-dust)); }
.background-plane.p4 { filter: drop-shadow(0 0 2px var(--tapa)); }

@keyframes float-plane {
    0%   { transform: translateY(0) scale(1) rotate(var(--angle, 0deg)); }
    50%  { transform: translateY(-40px) scale(1.08) rotate(var(--angle, 0deg)); }
    100% { transform: translateY(0) scale(1) rotate(var(--angle, 0deg)); }
}

/* Masquer les anciens cercles/triangles si besoin */
.background-circles, .background-triangles { display: none !important; }

/* Responsive */
@media screen and (max-width: 900px) {
    .navigation {
        flex-direction: column;
        align-items: flex-start;
        padding: 0 12px;
        gap: 8px;
    }
    .blinking-link {
        position: static;
        margin-top: 12px;
        right: unset;
    }
    .main-image {
        max-width: 95vw;
    }
}

@media screen and (max-width: 650px) {
    h1, p, .link-container {
        width: 95%;
    }
    .navigation {
        flex-direction: column;
        gap: 8px;
        padding: 0 4px;
    }
    .collapsible-allcontainer {
        flex-direction: column;
        gap: 8px;
    }
    .background-circles { display: none; }
    .background-triangles { display: none; }
    .background-planes { display: none; }
}

.centrik-btn-container {
            margin: 24px 0 0 0;
            text-align: left;
        }
        @media (max-width: 600px) {
        .centrik-btn-container {
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            margin-top: 25%;
            text-align: center;
            width: 100%;
            display: flex;
            justify-content: center;
            z-index: 30;
        }
            .centrik-btn-container .blinking-link {
                font-size: 1.1em;
                padding: 10px 18px;
                display: inline-block;
            }
        }
/* --- Accordion override to prevent conflicts --- */
.collapsible-container,
.collapsible,
.collapsible-btn,
.collapsible .content,
.collapsible .link {
    all: unset;
    box-sizing: border-box;
}
.collapsible-container {
    display: block;
}
.collapsible {
    display: block;
}
.collapsible-btn {
    display: flex;
    align-items: center;
    width: 100%;
    cursor: pointer;
    border: none;
    background: none;
    font: inherit;
    padding: 0;
}
.collapsible .content {
    display: block;
    overflow: hidden;
}
.collapsible .link {
    display: block;
    text-decoration: none;
}


    /* Modern collapsible styles */
    .collapsible-container {
        margin-bottom: 18px;
        border-radius: 12px;
        box-shadow: 0 2px 12px #0001;
        overflow: hidden;
        transition: box-shadow 0.2s;
    }
    .collapsible-btn {
        width: 100%;
        background: linear-gradient(90deg, #e3eafc 0%, #f7faff 100%);
        color: #222;
        border: none;
        outline: none;
        padding: 18px 24px;
        text-align: left;
        font-size: 1.15rem;
        font-family: 'DM Sans', sans-serif;
        font-weight: 700;
        cursor: pointer;
        display: flex;
        align-items: center;
        gap: 12px;
        transition: background 0.2s, color 0.2s;
        position: relative;
        border-bottom: 1px solid #e6e6e6;
    }
    .collapsible-btn.active,
    .collapsible-btn:hover {
        background: linear-gradient(90deg, #d0e2ff 0%, #eaf3ff 100%);
        color: #0a3d62;
    }
    .collapsible-btn .triangle {
        display: inline-block;
        width: 0;
        height: 0;
        border-left: 8px solid transparent;
        border-right: 8px solid transparent;
        border-top: 10px solid #4a6fa1;
        margin-right: 8px;
        transition: transform 0.3s cubic-bezier(.4,2,.6,1);
        transform: rotate(0deg);
    }
    .collapsible-btn.active .triangle {
        transform: rotate(90deg);
    }
    .collapsible .content {
        max-height: 0;
        overflow: hidden;
        background: transparent !important;
        transition: max-height 0.8s cubic-bezier(.4,2,.6,1), padding 0.3s, background 0.3s;
        padding: 0 !important;
        border-bottom-left-radius: 12px;
        border-bottom-right-radius: 12px;
    }
    .collapsible .content.open {
        padding: 16px 24px 24px 32px !important;
        max-height: 500px;
        background: #fff !important;
        /* Large enough for content */
    }
    .collapsible .link {
        display: block;
        margin: 10px 0;
        color: #2563eb;
        text-decoration: none;
        font-size: 1.05rem;
        border-radius: 6px;
        padding: 7px 12px;
        transition: background 0.15s, color 0.15s;
    }
    .collapsible .link:hover {
        background: #e3eafc;
        color: #0a3d62;
        cursor: pointer;
    }
    @media (max-width: 600px) {
        .collapsible-btn { font-size: 1rem; padding: 14px 14px; }
        .collapsible .content.open { padding: 12px 10px 16px 18px; }
    }