*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

html{
    scroll-behavior:smooth;
}

body{
    font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
    background:#f5f5f7;
    color:#1d1d1f;
	margin:0; 
	padding:0; 
	width:100%; 
	overflow-x:hidden;
}

/* =========================
   NAVIGATION
========================= */

.topnav{
    background:#fff;
    border-bottom:1px solid #e5e5e5;
    position:sticky;
    top:0;
    z-index:999;
}

.nav-container{
    max-width:1400px;
    margin:auto;
    padding:20px 40px;
    display:flex;
    justify-content:space-between;
    align-items:center;
}

.logo{
    text-decoration:none;
    color:#1d1d1f;
    font-size:32px;
    font-weight:600;
}

.nav-links{
    display:flex;
    gap:40px;
}

.nav-links a{
    text-decoration:none;
    color:#1d1d1f;
    transition:.3s;
}

.nav-links a:hover{
    opacity:.7;
}

/* =========================
   HERO SLIDER
========================= */

.hero-slider{
    position:relative; 
	width:100vw; 
	height:75vh; 
	overflow:hidden; 
	background:#000; 
	margin:0; 
	padding:0;
}

.slide{
	position:absolute; 
	top:0; 
	left:0; 
	width:100%; 
	height:100%; 
	opacity:0; 
	transition:opacity 1s ease;
}

.slide.active{
    opacity:1;
    z-index:2;
}

.slide img{
	width:100%; 
	height:100%; 
	object-fit:cover; 
	display:block;	
}

.hero-overlay{
    position:absolute;
    left:8%;
    bottom:12%;
    color:white;
    max-width:700px;
    z-index:10;
}

.hero-overlay h1{
    font-size:72px;
    font-weight:600;
    line-height:1.05;
    margin-bottom:15px;
}

.hero-overlay p{
    font-size:28px;
    line-height:1.4;
}

.slider-dots{
    position:absolute;
    bottom:40px;
    left:50%;
    transform:translateX(-50%);
    display:flex;
    gap:12px;
    z-index:20;
}

.dot{
    width:40px;
    height:4px;
    background:rgba(255,255,255,.4);
    border-radius:999px;
}

.dot.active{
    background:white;
}

/* =========================
   INTRO
========================= */

.intro{
    max-width:1000px;
    margin:100px auto;
    text-align:center;
    padding:0 20px;
}

.intro h2{
    font-size:48px;
    font-weight:500;
    line-height:1.4;
}

/* =========================
   THEMEN
========================= */

.topics,
.sessions{
    max-width:1200px;
    margin:auto;
    padding:80px 20px;
}

.topics h2,
.sessions h2{
    font-size:56px;
    margin-bottom:50px;
}

.cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
    gap:30px;
}

.card{
    background:white;
    border-radius:30px;
    overflow:hidden;
    text-decoration:none;
    color:black;
    transition:.3s;
    box-shadow:0 5px 15px rgba(0,0,0,.05);
}

.card:hover{
    transform:translateY(-8px);
    box-shadow:0 20px 40px rgba(0,0,0,.12);
}

.card img{
    width:100%;
    height:280px;
    object-fit:cover;
}

.card-content{
    padding:30px;
}

.card-content span{
    font-size:12px;
    letter-spacing:1px;
    color:#6e6e73;
}

.card-content h3{
    font-size:32px;
    line-height:1.2;
    margin-top:10px;
}

/* =========================
   SESSION LISTE
========================= */

.session-row{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:40px 0;
    border-top:1px solid #ddd;
}

.session-row h3{
    font-size:34px;
    margin-bottom:10px;
}

.session-row p{
    color:#6e6e73;
    line-height:1.6;
}

.details-btn,
.register-btn{
    border:1px solid #000;
    border-radius:999px;
    padding:12px 24px;
    text-decoration:none;
    color:#000;
    display:inline-block;
    transition:.3s;
}

.details-btn:hover,
.register-btn:hover{
    background:#000;
    color:#fff;
}

/* =========================
   SESSION HERO
========================= */

.session-hero{
    width:100%;
    background:#fff;
}

.session-hero img{
    width:100%;
    height:650px;
    object-fit:cover;
    display:block;
}

/* =========================
   SESSION PAGE
========================= */

.session-page{
    max-width:900px;
    margin:80px auto;
    padding:0 30px;
}

.session-page h1{
    font-size:64px;
    line-height:1.1;
    margin-bottom:25px;
}

.location{
    display:inline-block;
    margin-bottom:50px;
    color:#0066cc;
    text-decoration:none;
}

.location:hover{
    text-decoration:underline;
}

.date-box{
    max-width:500px;
    border:1px solid #ddd;
    border-radius:20px;
    padding:30px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    background:white;
}

.date-box p{
    color:#6e6e73;
    margin-top:8px;
}

.more-dates{
    margin:15px 0 30px;
    color:#6e6e73;
}

.description{
    margin-top:70px;
    font-size:28px;
    line-height:1.8;
}

.description p{
    margin-bottom:30px;
}

.address{
    margin-top:60px;
    font-size:24px;
    line-height:1.8;
}

/* =========================
   FOOTER
========================= */

footer{
    margin-top:120px;
    border-top:1px solid #ddd;
    background:#f5f5f7;
}

.footer-container{
    max-width:1400px;
    margin:auto;
    padding:40px;
}

.footer-top{
    margin-bottom:30px;
    color:#6e6e73;
    font-size:14px;
}

.footer-bottom{
    display:flex;
    justify-content:space-between;
    align-items:center;
    border-top:1px solid #ddd;
    padding-top:20px;
    font-size:14px;
}

.footer-links{
    display:flex;
    gap:20px;
}

.footer-links a{
    text-decoration:none;
    color:#6e6e73;
}

.footer-links a:hover{
    text-decoration:underline;
}

.booking-page{
    max-width:900px;
    margin:80px auto;
    padding:0 30px;
}

.selected-session{
    text-align:center;
    margin-bottom:120px;
}

.selected-session h1{
    font-size:64px;
    margin-bottom:40px;
}

.session-card{
    max-width:650px;
    margin:0 auto 25px;
    background:white;
    border-radius:20px;
    overflow:hidden;
    display:flex;
    box-shadow:0 10px 25px rgba(0,0,0,.05);
}

.session-card img{
    width:220px;
    height:220px;
    object-fit:cover;
}

.session-info{
    padding:30px;
    text-align:left;
    display:flex;
    flex-direction:column;
    justify-content:center;
}

.change-session{
    color:#0066cc;
    text-decoration:none;
}

.booking-form h2{
    font-size:64px;
    margin-bottom:60px;
    line-height:1.1;
}

.booking-form h3{
    margin:40px 0 20px;
    font-size:28px;
}

.booking-form input,
.booking-form select,
.booking-form textarea{
    width:100%;
    padding:18px;
    border:1px solid #d2d2d7;
    border-radius:12px;
    background:white;
    font-size:17px;
    margin-bottom:20px;
}

.booking-form select{
    appearance:none;
    -webkit-appearance:none;
    -moz-appearance:none;

    padding-left:20px;
    padding-right:60px;

    background-color:white;

    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='black' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");

    background-repeat:no-repeat;

    background-position:right 20px center;

    background-size:16px;
}

.two-columns{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
}

.group-selector{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
    margin-bottom:30px;
}

.group-box{
    border:1px solid #d2d2d7;
    border-radius:16px;
    padding:30px;
    text-align:center;
    cursor:pointer;
    background:white;
}

.group-box input{
    display:none;
}

.checkbox{
    display:flex;
    gap:10px;
    margin-top:20px;
    align-items:flex-start;
}

.checkbox input{
    width:auto;
    margin-top:5px;
}

.submit-btn{
    margin-top:40px;
    padding:16px 36px;
    border-radius:999px;
    border:1px solid #000;
    background:white;
    cursor:pointer;
    font-size:17px;
}

.submit-btn:hover{
    background:black;
    color:white;
}

/* =========================
   MOBILE
========================= */

@media(max-width:768px){

    .nav-container{
        padding:20px;
        flex-direction:column;
        gap:15px;
    }

    .logo{
        font-size:24px;
    }

    .nav-links{
        gap:20px;
        flex-wrap:wrap;
        justify-content:center;
    }

    .hero-slider{
        height:60vh;
    }

    .hero-overlay{
        left:30px;
        right:30px;
        bottom:60px;
    }

    .hero-overlay h1{
        font-size:42px;
    }

    .hero-overlay p{
        font-size:20px;
    }

    .intro h2{
        font-size:32px;
    }

    .topics h2,
    .sessions h2{
        font-size:40px;
    }

    .session-row{
        flex-direction:column;
        align-items:flex-start;
        gap:20px;
    }

    .session-hero img{
        height:350px;
    }

    .session-page h1{
        font-size:42px;
    }

    .description{
        font-size:20px;
    }

    .address{
        font-size:18px;
    }
	
	.selected-session h1,
    .booking-form h2{
        font-size:42px;
    }

    .session-card{
        flex-direction:column;
    }

    .session-card img{
        width:100%;
        height:220px;
    }

    .two-columns,
    .group-selector{
        grid-template-columns:1fr;
    }

    .footer-bottom{
        flex-direction:column;
        gap:15px;
        align-items:flex-start;
    }
}
```