:root {
    --primary-color: #722F37; /* Rouge vin */
    --secondary-color: #F4EBE8; /* Fond doux */
    --text-color: #333333;
    --border-radius: 8px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--secondary-color);
}

header {
    background: var(--primary-color);
    color: #fff;
    padding: 3rem 1rem;
    text-align: center;
}

header h1 {
    margin: 0 0 10px 0;
    font-size: 2.5rem;
}

header h2 {
    margin: 0;
    font-weight: 300;
    font-size: 1.2rem;
    opacity: 0.9;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.highlight {
    border-top: 4px solid var(--primary-color);
}

/* Vidéo YouTube Responsive */
.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--border-radius);
}

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

/* Intervenants */
.speakers-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.speaker-card {
    border: 1px solid #eaeaea;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
}

.speaker-card img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 1rem;
    border: 3px solid var(--primary-color);
}

.speaker-card h4 {
    margin: 0 0 0.5rem 0;
    color: var(--primary-color);
}

.bio {
    font-size: 0.9rem;
    color: #555;
}

/* Formulaires */
form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    gap: 15px;
}

.form-group input {
    flex: 1;
}

input, textarea {
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
}

.file-drop-area {
    border: 2px dashed #ccc;
    border-radius: 4px;
    padding: 20px;
    text-align: center;
    background: #fafafa;
}

.btn-primary, .btn-small {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 12px 24px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 1rem;
    text-decoration: none;
    display: inline-block;
    transition: opacity 0.3s;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-primary:hover, .btn-small:hover {
    opacity: 0.9;
}

.text-center { text-align: center; }
.success-icon { font-size: 4rem; color: #28a745; margin-bottom: 1rem; }
.error-icon { font-size: 4rem; color: #dc3545; margin-bottom: 1rem; }

footer {
    text-align: center;
    padding: 2rem;
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .form-group { flex-direction: column; }
}