/* ============================================
   FitIQ Hub - Header Styles
   ============================================ */

   .header {
    background-color: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: var(--z-dropdown);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    will-change: transform;
}

.header .container {
    padding: var(--spacing-md) var(--spacing-lg);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

/* ============================================
   LOGO
   ============================================ */

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: translateY(-2px);
}

.logo-img {
    width: 162px;
    height: 52px;
    display: block;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: var(--fw-black);
    color: var(--text-white);
    letter-spacing: -0.5px;
}

.logo-text::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
    margin-left: var(--spacing-xs);
    vertical-align: middle;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.2);
    }
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    font-family: var(--font-heading);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-base);
    color: var(--text-light-gray);
    position: relative;
    transition: color var(--transition-base);
    padding: var(--spacing-sm) 0;
}

.nav-link:hover {
    color: var(--primary-color);
}

/* Underline animation on hover */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

/* ============================================
   MOBILE MENU BUTTON (Hidden by default)
   ============================================ */

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-white);
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   MOBILE RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background-color: var(--bg-darker);
        border-bottom: 1px solid var(--border-color);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }

    .nav.active {
        max-height: 250px;
    }

    .nav-link {
        padding: var(--spacing-sm) var(--spacing-lg);
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        margin: 0;
    }

    .nav-link::after {
        display: none;
    }

    .nav-link:hover {
        background-color: rgba(0, 230, 118, 0.05);
    }

    .menu-toggle {
        display: flex;
    }

    .header-content {
        position: relative;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: var(--fs-lg);
    }

    .logo-img {
        width: 88px;
        height: 28px;
    }

    .header .container {
        padding: var(--spacing-md);
    }
}