*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial, sans-serif;
}

body{
    background:#111;
    color:white;
    line-height:1.6;
}

/* Navigation */

header{
    position:fixed;
    width:100%;
    top:0;
    background:rgba(0,0,0,0.9);
    z-index:1000;
}

nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:20px 10%;
}

.logo{
    color:#fff;
}

nav ul{
    display:flex;
    gap:25px;
    list-style:none;
}

nav a{
    color:white;
    text-decoration:none;
    transition:0.3s;
}

nav a:hover{
    color:#ff3c3c;
}

/* Hero */

.hero{
    height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    text-align:center;
    background:
        linear-gradient(
            rgba(0,0,0,0.6),
            rgba(0,0,0,0.6)
        ),
        url("Firefly_Gemini Flash.png");
    background-size:cover;
    background-position:center;
}

.hero-content h2{
    font-size:4rem;
    margin-bottom:20px;
}

.hero-content p{
    max-width:700px;
    margin:auto;
    margin-bottom:30px;
}

.btn{
    display:inline-block;
    padding:15px 35px;
    background:#ff3c3c;
    color:white;
    text-decoration:none;
    border-radius:30px;
    transition:0.3s;
}

.btn:hover{
    background:#ff6666;
}

/* Sections */

.section{
    padding:100px 10%;
}

.section h2{
    text-align:center;
    margin-bottom:40px;
    font-size:2.5rem;
}

/* Vidéos */

.video-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(350px,1fr));
    gap:30px;
}

.video-card{
    position:relative;
    padding-bottom:56.25%;
    height:0;
    overflow:hidden;
    border-radius:15px;
}

.video-card iframe{
    position:absolute;
    width:100%;
    height:100%;
    left:0;
    top:0;
}

/* Services */

.services{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:25px;
}

.service{
    background:#1e1e1e;
    padding:30px;
    border-radius:15px;
    text-align:center;
}

.service h3{
    margin-bottom:15px;
}

/* Contact */

#contact{
    text-align:center;
}

/* Footer */

footer{
    text-align:center;
    padding:30px;
    background:#000;
}

/* Responsive */

@media(max-width:768px){

    nav{
        flex-direction:column;
        gap:15px;
    }

    nav ul{
        flex-wrap:wrap;
        justify-content:center;
    }

    .hero-content h2{
        font-size:2.5rem;
    }

}