* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", system-ui, sans-serif;
}

body {
    background: #f4f6fb;
    color: #1f2937;
}

/* HEADER */
.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 3rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    z-index: 100;
}

.logo {
    font-weight: 800;
    letter-spacing: 1px;
    color: #4f46e5;
}

.nav a {
    margin-left: 2rem;
    text-decoration: none;
    color: #1f2937;
    font-weight: 500;
    position: relative;
}

.nav a::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: #4f46e5;
    transition: 0.3s;
}

.nav a:hover::after {
    width: 100%;
}

/* HERO */
.hero {
    min-height: 90vh;
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    padding: 2rem;
}

.hero-content {
    animation: fadeUp 1s ease forwards;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

.hero p {
    margin: 1rem 0;
    font-size: 1.2rem;
}

.date {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.6rem 1.2rem;
    background: rgba(255,255,255,0.2);
    border-radius: 999px;
    font-weight: 600;
}

/* PROGRAMME */
.programme {
    padding: 5rem 3rem;
    max-width: 1200px;
    margin: auto;
}

.programme h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: 1.2rem;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    transition: 0.4s;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(79,70,229,0.3);
}

.emoji {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.card h3 {
    color: #4f46e5;
    margin-bottom: 1rem;
}

/* CTA */
.cta {
    background: linear-gradient(135deg, #111827, #1f2937);
    color: white;
    text-align: center;
    padding: 4rem 2rem;
}

.cta h2 {
    font-size: 2.5rem;
}

.cta p {
    margin: 1rem 0 2rem;
}

.btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    background: #4f46e5;
    color: white;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s;
}

.btn:hover {
    background: #4338ca;
    transform: scale(1.05);
}

/* FOOTER */
.footer {
    background: #0f172a;
    color: #9ca3af;
    text-align: center;
    padding: 1.5rem;
    font-size: 0.9rem;
}

/* ANIMATION */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
    }

    .nav a {
        margin: 0 1rem;
    }
}