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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.4;
    background: #f0f2f5;
}

/* En-tête */
.conference-header {
    background: #ffffff;
    padding: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 15px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    height: 40px;
    width: auto;
}

.conference-title {
    font-size: 1.2em;
    color: #007bff;
    margin: 0;
    flex-grow: 1;
}
.conference-title span {
    font-size: 0.9em;
    color: #000;
}

.back-link {
    text-decoration: none;
    color: #fff;
    background: #007bff;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9em;
    white-space: nowrap;
}

/* Contenu principal */
.container {
    width: 100%;
    padding: 10px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Tabs */
.tabs {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 15px;
}

.tab {
    padding: 12px 15px;
    background: #fff;
    border: 1px solid #007bff;
    border-radius: 8px;
    font-size: 0.95em;
    color: #007bff;
    cursor: pointer;
    transition: all 0.2s;
}

.tab.active {
    background: #007bff;
    color: white;
    font-weight: 600;
}

/* Sessions */
.tab-content {
    display: none;
    animation: slideUp 0.3s ease;
}

.tab-content.active {
    display: block;
}

.session-item {
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1.1rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid #2c3e50;
    padding-top: 0.5rem;
}

.session-title {
    color: #2c3e50;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #ecf0f1;
}

.session-chair {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    font-style: italic;
}

.session-location {
    color: #512da8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Style des articles */
dl {
    margin: 0.8rem 0;
    padding: 1rem;
    background: #f9f9f9;
    border-radius: 5px;
    transition: transform 0.2s;
}

dl:hover {
    transform: translateX(5px);
    background: #f1f2f6;
}

dt {
    color: #000;
    font-weight: 600;
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

dd {
    color: #34495e;
    margin-left: 1rem;
    font-size: 0.9rem;
    line-height: 1.4;
    border-left: 2px solid #bdc3c7;
    padding-left: 1rem;
    font-style: italic;
}

.session-track {
    /*margin-bottom: 20px;*/
    background: #fff;
    padding: 15px;
    border-radius: 8px;
}

.session-track h3 {
    color: #007bff;
    font-size: 1.1em;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Animations */
@keyframes slideUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 768px) {
    .session-item {
        padding: 1rem;
    }
    
    .session-title {
        font-size: 0.8rem;
    }
    
    dl {
        margin: 1rem 0;
        padding: 0.8rem;
    }
    
    dt, dd {
        font-size: 0.85rem;
    }
}

/* Responsive */
@media (max-width: 480px) {
    .header-content {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .conference-title {
        font-size: 1em;
        order: 3;
        width: 100%;
        text-align: center;
    }

    .conference-title span {
        font-size: 0.6em;
        color: #000;
    }
    
    .back-link {
        padding: 6px 12px;
        font-size: 0.8em;
    }

    .logo {
        height: 35px;
    }
}
.session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}
.session-item.single{
    box-shadow: none;
    border-left: none;
    padding: 0px;
    margin-top: 0;
}
.element {
    background: #ffffff;
    text-align: justify;
    padding: 0.8rem 1.1rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid #2c3e50;
    padding-top: 0.5rem;
    color:#2c3e50;
}
.element h4{
    margin-bottom: 10px;
}
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
    z-index: 10000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    max-width: 500px;
    width: 90%;
    position: relative;
    animation: modalSlide 0.3s ease-out;
}

@keyframes modalSlide {
    from { transform: translateY(-100px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
}

/* Ajout du bouton CTA */
.cta-container {
    text-align: center;
    margin-top: 3rem;
}

.cta-btn {
    background: var(--accent);
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1.1rem;
    transition: transform 0.3s;
}

.cta-btn:hover {
    transform: scale(1.05);
}
/* Form style */
.form-label {
    margin-bottom: .5rem;
    display: inline-block;
}
.form-control {
    display: block;
    width: 100%;
    padding: .375rem .75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
}
.form-text {
    margin-top: .25rem;
    font-size: .875em;
    color: rgba(33, 37, 41, 0.75);
}
.sep{
    border-bottom: 1px solid #000;
    padding-bottom: 7px;
    margin-bottom: 10px;
}
.showpaper{cursor: pointer;}
div.text{
    font-size: 0.9rem;
    line-height: 25px;
}


.program-tabs{
    display:flex;
    gap:10px;
    list-style:none;
    padding:0;
    margin-bottom:25px;
    flex-wrap:wrap;
}

.program-tabs li{
    flex:1;
}

.program-tabs button{
    width:100%;
    border:none;
    background:#f8f9fa;
    padding:14px;
    border-radius:10px;
    text-align:center;
    transition:all .2s ease;
}

.program-tabs button:hover{
    background:#e9ecef;
}

.program-tabs button.active{
    background:#0d6efd;
    color:white;
}

.program-tabs .day{
    display:block;
    font-weight:600;
}

.program-tabs .date{
    font-size:13px;
    opacity:.8;
}