:root {
    --primary-red: #e63946;
    --primary-green: #2a9d8f;
    --dark-bg: #0a192f;
    --light-bg: #f8f9fa;
}
body {
    font-family: 'Inter', sans-serif;
    scroll-behavior: smooth;
}
h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
}
/* MISE À JOUR : Transparence du dégradé augmentée pour mieux voir les vidéos */
.hero-gradient {
    background: linear-gradient(135deg, rgba(10, 25, 47, 0.45) 0%, rgba(42, 157, 143, 0.25) 100%);
}
.card-hover {
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
}
.card-hover:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}
.btn-primary {
    background-color: var(--primary-green);
    color: white;
    padding: 0.875rem 2.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(42, 157, 143, 0.4);
    border: none;
    cursor: pointer;
}
.btn-primary:hover {
    background-color: #21867a;
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(42, 157, 143, 0.5);
}
.btn-secondary {
    background-color: transparent;
    color: var(--primary-green);
    border: 2px solid var(--primary-green);
    padding: 0.875rem 2.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
}
.btn-secondary:hover {
    background-color: var(--primary-green);
    color: white;
    transform: translateY(-2px);
}
.nav-scrolled {
    background-color: rgba(10, 25, 47, 0.98);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.15);
}
.admin-sidebar {
    background-color: var(--dark-bg);
}
.admin-nav-item.active {
    background-color: var(--primary-green);
    color: white;
}
.admin-nav-item:hover:not(.active) {
    background-color: rgba(255, 255, 255, 0.1);
}