/* Nike-Style Header CSS */
.mobile-hidden {
    display: inline;
}

.mobile-only {
    display: none;
}

header {
    background-color: rgba(15, 15, 15, 0.97);
    padding: 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
    padding: 0 20px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.2px;
}

.logo span {
    color: #e60000;
}

/* Nike-Style Mobile Header */
@media (max-width: 768px) {
    header .container {
        height: 56px;
    }
    
    .mobile-hidden {
        display: none;
    }
    
    .mobile-only {
        display: inline;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .burger {
        width: 40px;
        height: 40px;
    }
    
    .burger span {
        width: 22px;
    }
}

@media (max-width: 428px) {
    header .container {
        height: 50px;
        padding: 0 16px;
    }
    
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .burger {
        width: 36px;
        height: 36px;
    }
    
    .burger span {
        width: 20px;
        height: 2px;
        margin: 3px 0;
    }
}