@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px;
    transition: all 0.4s ease;
}

.header-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    position: relative;
}

.header-logo {
    position: absolute;
    left: 43px;
    top: 15px;
    text-decoration: none;
    color: #ffffff;
    font-size: 17px;
    font-weight: 400;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    z-index: 1002;
    transition: all 0.4s ease;
}

nav {
    backdrop-filter: blur(20px);
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    transition: all 0.4s ease;
}

.nav-btn {
    margin-right: 55px;
    text-decoration: none;
    color: #ffffff;
    font-weight: 400;
    font-size: 20px;
    letter-spacing: 1px;
    padding: 5px 0;
    text-shadow: 0 3px 3px rgba(0,0,0,0.5);
    transition: transform 0.3s, color 0.3s ease;
}

.nav-btn:hover {
    color: #eb6363;
    transform: scale(1.05);
}

.nav-btn:last-child {
    margin-right: 0;
}

.header-light {
    background: transparent;
}

.header-light .header-logo,
.header-light .nav-btn {
    color: #000000;
    text-shadow: none;
}

.header-light nav {
    background: transparent;
}

.header-light .nav-btn:hover {
    color: #eb6363;
}

.questions {
    background: white;
    color: black;
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: center;
        padding: 0 5px;
    }
    .header-logo {
        display: none;
    }
    nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        height: auto;
        padding: 5px 10px;
    }
    .nav-btn {
        margin: 4px 5px;
        font-size: 14px;
    }
}