/* Header styles */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all var(--transition-normal);
}

.header__logo h1 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--blue);
    margin: 0;
    background: linear-gradient(45deg, var(--blue), var(--red));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: all var(--transition-normal);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.header__logo:hover h1 {
    transform: scale(1.05) rotate(-2deg);
    background-position: 100%;
}

.header__nav ul {
    display: flex;
    gap: var(--spacing-lg);
}

.header__nav a {
    color: var(--dark-gray);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
    text-decoration: none;
}

.header__nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--blue), var(--red));
    transition: width var(--transition-normal);
}

.header__nav a:hover {
    color: var(--blue);
    transform: translateY(-2px);
}

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

.header__nav a.active {
    color: var(--blue);
    font-weight: 600;
}

.header__nav a.active::after {
    width: 100%;
}

.header__menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.header__menu-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background: linear-gradient(to right, var(--blue), var(--red));
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

/* Mobile styles */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
        background-color: rgba(255, 255, 255, 0.95);
    }
    
    .header__logo h1 {
        font-size: var(--font-lg);
    }
    
    .header__menu-toggle {
        display: flex;
    }

    .header__nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        box-shadow: -2px 0 20px rgba(0, 0, 0, 0.15);
        padding: var(--spacing-2xl) var(--spacing-lg);
        transition: all var(--transition-normal);
        z-index: 200;
        overflow-y: auto;
    }

    .header__nav.active {
        right: 0;
    }

    .header__nav ul {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .header__nav a {
        display: block;
        padding: var(--spacing-sm) 0;
        font-size: var(--font-md);
    }

    /* Menu toggle animation */
    .header__menu-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .header__menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .header__menu-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
    
    /* Add overlay when menu is active */
    .header__nav::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.3);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: -1;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .header__nav.active::before {
        opacity: 1;
        visibility: visible;
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .header__logo h1 {
        font-size: var(--font-md);
    }
    
    .header__nav {
        width: 85%;
        padding: var(--spacing-xl) var(--spacing-md);
    }
}

@media (min-width: 1024px) {
    .header {
        padding: var(--spacing-lg) var(--spacing-2xl);
    }

    .header__logo h1 {
        font-size: var(--font-2xl);
        letter-spacing: 0.5px;
    }

    .header__logo:hover h1 {
        transform: scale(1.08) rotate(-1deg);
        text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.15);
    }

    .header__nav ul {
        gap: var(--spacing-xl);
    }

    .header__nav a {
        font-size: var(--font-md);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .header__nav a:hover {
        transform: translateY(-3px);
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
    }
}