@font-face {
    font-family: "American Captain.ttf";
    src: url("fonts/american_captain/American Captain.ttf") format("truetype");
}
:root {
    --primary-main-color: rgba(255, 187, 0, 0.996);
    --primary-bg-color: radial-gradient(
        circle at top,
        #2a3142,
        #0f131c
    );
    --primary-index-color:#ffffffc2;
    --primary-text-color:#fbfbfbf1;
    --primary-other-color: #903cfff1;
    --primary-degrade-color:linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.08),
        rgba(255, 255, 255, 0.03)
    );
    --primary-card-color: linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.08),
        rgba(255, 255, 255, 0.03)
    );
    
}
header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px; /* hauteur fixe */
    display: flex;
    justify-content: center;
    align-items: center;
    background: transparent; /* départ transparent */
    z-index: 1000;
    font-size: 30px;
}
header nav {
    display: flex;
    gap: 45px;
}

header nav a {
    color: rgb(255, 255, 255); /* texte noir au départ */
    text-decoration: none;
    padding: 10px 20px;
    font-weight: 500;
    transition: 0.3s ease;
    font-family: "American Captain.ttf", sans-serif;
}

header nav a:hover {
    background: rgba(255, 187, 0, 0.996);
    border-radius: 30px;
}

/* quand on scroll */
header.scrolled {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(6px);
}

header.scrolled nav a {
    color: white; /* texte blanc au scroll */
}
#intituler_page .presentation_btssio h1{
    font-size: 30px;
    margin-top: 230px;
    margin-left: 100px;
    color: aliceblue;

}
#intituler_page {
    height: 100px; /* hauteur de ta bannière */
    width: 100%;   /* toute la largeur de la page *
    background-size: cover;         /* remplit sans déformer */
    background-position: bottom; /* montre le centre + bas */
    background-repeat: no-repeat;
    background-attachment: scroll;  
    display: flex;
    align-items: center;            /* centre verticalement le texte (optionnel) */
    justify-content: flex-start;        /* centre horizontalement le texte (optionnel) */
    position: block;
    background-attachment: fixed;
    margin-bottom: ;

}
.bts-options {
    display: flex;
    gap: 100px;
    max-width: 1000px;
    margin: 40px auto 60px;
    padding: 0 20px;
}

.option-card {
    flex: 1;
    padding: 30px;

    background: linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.08),
        rgba(255, 255, 255, 0.03)
    );

    backdrop-filter: blur(14px);

    border-radius: 22px;

    color: var(--primary-text-color);

    position: relative;
    cursor: pointer;

    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.55),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);

    transition:
        transform 0.4s ease,
        box-shadow 0.4s ease,
        background 0.4s ease;
}


.option-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.4);
    border: 2px solid  var(--primary-main-color);
}

.option-header {
    display: flex;
    align-items: center;
    gap: 15px;
}

.option-header img {
    width: 70px;
    height: auto;        /* 👈 garde les proportions */
    max-height: 70px;    /* limite la taille */
    object-fit: contain;
}

.option-header h2 {
    font-family: "American Captain.ttf", sans-serif;
    font-size: 28px;
    color: rgb(255, 208, 0);
}

.option-subtitle {
    margin: 15px 0 20px;
    font-size: 14px;
    color: #cfcfcf;
}

.option-card ul {
    list-style: none;
    padding-left: 0;
}

.option-card ul li {
    margin-bottom: 12px;
    font-size: 14px;
    position: relative;
    padding-left: 20px;
}

.option-card ul li::before {
    content: "›";
    position: absolute;
    left: 0;
    color: rgb(255, 208, 0);
    font-weight: bold;
}

.badge {
    position: absolute;
    top: 25px;
    right: 25px;
    background: rgb(255, 208, 0);
    color: black;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

/* Responsive */
@media (max-width: 900px) {
    .bts-options {
        flex-direction: column;
    }
}
.bts-info {
    max-width: 1200px;           /* ⬅ largeur de l’encadré */
    margin: 120px auto 80px;     /* ⬅ position verticale */
    padding: 40px 50px;          /* ⬅ taille intérieure */
    
    background: var(--primary-card-color);         /* gris foncé */
    border-radius: 20px;


    box-shadow: 0 0 25px rgba(0,0,0,0.6);

    color: white;
    text-align: center;
}

.bts-info h2 {
    font-family: "American Captain.ttf", sans-serif;
    font-size: 36px;
    margin-bottom: 20px;
    color: rgb(255, 187, 0);
}

.bts-info p {
    font-size: 16px;
    line-height: 1.7;
    max-width: 900px;
    margin: 0 auto 30px;
    color: #e0e0e0;
}

/* Tags */
.bts-tags {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.bts-tags span {
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(192, 192, 192, 0.218);
    border: 1px solid rgb(255, 187, 0);
    font-size: 14px;
    color: rgb(255, 187, 0);
}
body {
    margin: 0;
    min-height: 100vh;

    background: var(--primary-bg-color);
    color: var(--primary-text-color);

    font-family: "Inter", system-ui, sans-serif;
}
.card-glass {
    background: var(--primary-degrade-color);
    backdrop-filter: blur(14px);

    border-radius: 22px;
    border: 1.5px solid var(--primary-main-color);

    padding: 28px;

    box-shadow:
        0 35px 70px rgba(0, 0, 0, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);

    transition:
        transform 0.4s ease,
        box-shadow 0.4s ease,
        background 0.4s ease;
}
.option-card,
.bts-info {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.option-card.show,
.bts-info.show {
    opacity: 1;
    transform: translateY(0);
}
#footer {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-top: auto;

    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgb(255, 187, 0);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1000px;
    padding: 14px 30px;
}

.footer-copy {
    font-size: 12px;
    color: var(--primary-text-color);
    margin: 0;
    font-family: "Inter", sans-serif;
}

.footer-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-nav a {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    font-family: "American Captain.ttf", sans-serif;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.footer-nav a:hover {
    color: rgba(255, 187, 0, 0.95);
}

.footer-sep {
    color: rgba(255, 255, 255, 0.2);
    font-size: 12px;
}