.header {
    background: #fff;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
}

.nav ul {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav a {
    font-size: 0.8rem;
    font-weight: 700;
    color: #333;
}

.btn-sponsor {
    background-color: #a3f1d4;
    padding: 10px 15px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.btn-sponsor:hover {
    background-color: #8ce4c4;
}