/* Shared site header / navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10,15,25,.55);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(255,255,255,.08);
    transition: all .3s ease;
    box-shadow: 0 4px 20px rgba(0,0,0,.08);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 90px;
}

.logo img {
    transition: .3s ease;
}

.logo img:hover {
    transform: scale(1.04);
}

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

.nav a {
    color: rgba(255,255,255,.88);
    font-size: 15px;
    font-weight: 500;
    transition: .25s ease;
    position: relative;
    padding: 6px 0;
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 0;
    height: 2px;
    border-radius: 20px;
    background: #fff;
    transition: .25s ease;
}

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

.nav a:hover {
    color: #fff;
    transform: translateY(-1px);
}

.btn-login {
    padding: 12px 20px;
    border-radius: 999px;
    background: rgba(255,255,255,.10);
    border: 1px solid rgba(255,255,255,.16);
    backdrop-filter: blur(10px);
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        justify-content: center;
        gap: 16px;
        padding: 14px 0;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
    }
}