header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: transform 0.4s ease-in-out, opacity 0.4s ease-in-out;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

header.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 40px;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 1px;
}

.header-left nav {
    display: flex;
    gap: 20px;
}

.header-left nav a {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.header-right .dev-name {
    font-weight: 700;
    font-size: 1.2rem;
}