/* ========================================
   Pheelio Header Styles
   Shared across all pages for consistency
   Pantone 300 Blue & White Theme
   WCAG 2.1 AA Adherence
   ======================================== */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
    /* Color Palette - Pantone 300 Blue & White */
    --color-primary: #005EB8;
    --color-primary-light: #0073E6;
    --color-primary-dark: #003D7A;
    --color-accent: #005EB8;
    --color-accent-hover: #0073E6;
    
    /* Neutrals */
    --color-white: #ffffff;
    --color-off-white: #f8f9fa;
    --color-gray-100: #e9ecef;
    --color-gray-200: #dee2e6;
    --color-gray-600: #495057;
    --color-gray-800: #212529;
    --color-black: #000000;
    
    /* Typography */
    --font-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Font Sizes (fluid typography) */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --text-base: clamp(1rem, 0.925rem + 0.375vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.375rem);
    --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.625rem);
    --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Layout */
    --max-width: 1280px;
    --header-height: 4rem;
    --header-padding-x: clamp(1rem, 3vw, 2.5rem);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    
    /* Shadows */
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    z-index: 9999;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: top var(--transition-fast);
    text-decoration: none;
}

.skip-link:focus {
    top: var(--space-md);
    outline: 3px solid var(--color-primary-light);
    outline-offset: 2px;
}

/* ========================================
   Header Container
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-100);
    transition: background-color var(--transition-base);
}

.site-header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.header-container {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0 var(--header-padding-x);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

/* ========================================
   Logo
   ======================================== */
.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    flex-shrink: 0;
}

.logo-link:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.logo {
    height: 3rem;
    width: auto;
    max-width: 160px;
    display: block;
    object-fit: contain;
}

@media (min-width: 640px) {
    .logo {
        height: 4rem;
        max-width: 200px;
    }
}

@media (min-width: 1024px) {
    .logo {
        height: 5rem;
        max-width: 240px;
    }
}

@media (min-width: 1280px) {
    .logo {
        height: 5.5rem;
        max-width: 280px;
    }
}

.logo-fallback {
    display: none;
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

/* ========================================
   Navigation
   ======================================== */
.main-nav {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list li {
    margin: 0;
    padding: 0;
}

.nav-list a {
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    text-decoration: none;
    transition: color var(--transition-fast), background-color var(--transition-fast);
    min-height: 2.25rem;
    min-width: 2.25rem;
    padding: var(--space-xs) var(--space-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border-radius: var(--radius-sm);
}

@media (min-width: 640px) {
    .nav-list {
        gap: var(--space-md);
    }
    
    .nav-list a {
        font-size: var(--text-base);
        padding: var(--space-xs) var(--space-md);
        min-height: 2.5rem;
        min-width: 2.5rem;
    }
}

@media (min-width: 1024px) {
    .nav-list {
        gap: var(--space-lg);
    }
    
    .nav-list a {
        font-size: var(--text-base);
        font-weight: 500;
        padding: var(--space-sm) var(--space-lg);
        min-height: 2.5rem;
        min-width: 2.5rem;
    }
}

@media (min-width: 1280px) {
    .nav-list {
        gap: var(--space-xl);
    }
    
    .nav-list a {
        font-size: var(--text-lg);
        padding: var(--space-sm) var(--space-xl);
    }
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0.25rem;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
    border-radius: 2px;
}

.nav-list a:hover,
.nav-list a:focus {
    color: var(--color-primary);
    background-color: rgba(0, 94, 184, 0.05);
}

.nav-list a:hover::after,
.nav-list a:focus::after {
    width: calc(100% - var(--space-lg));
}

.nav-list a:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
    background-color: rgba(0, 94, 184, 0.1);
}

/* Active/Current Page Indicator */
.nav-list a[aria-current="page"],
.nav-list a.active {
    color: var(--color-primary);
    font-weight: 600;
    background-color: rgba(0, 94, 184, 0.08);
}

.nav-list a[aria-current="page"]::after,
.nav-list a.active::after {
    width: calc(100% - var(--space-lg));
}

/* ========================================
   Shop CTA Button
   ======================================== */
.nav-cta {
    min-height: 2.25rem !important;
    padding: var(--space-xs) var(--space-sm) !important;
    background-color: var(--color-primary) !important;
    color: var(--color-white) !important;
    border-radius: var(--radius-md);
    font-weight: 600 !important;
    font-size: var(--text-sm) !important;
    transition: background-color var(--transition-fast) !important;
}

@media (min-width: 640px) {
    .nav-cta {
        min-height: 2.5rem !important;
        padding: var(--space-xs) var(--space-md) !important;
        font-size: var(--text-base) !important;
        border-radius: var(--radius-md);
    }
}

@media (min-width: 1024px) {
    .nav-cta {
        min-height: 2.5rem !important;
        padding: var(--space-sm) var(--space-lg) !important;
        font-size: var(--text-base) !important;
        border-radius: var(--radius-md);
    }
}

@media (min-width: 1280px) {
    .nav-cta {
        min-height: 2.5rem !important;
        padding: var(--space-sm) var(--space-xl) !important;
        font-size: var(--text-lg) !important;
    }
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover,
.nav-cta:focus {
    background-color: var(--color-primary-light) !important;
    color: var(--color-white) !important;
}

.nav-cta:focus-visible {
    outline: 3px solid var(--color-primary-dark) !important;
    outline-offset: 4px !important;
}

/* ========================================
   Responsive Header Height
   ======================================== */
@media (min-width: 640px) {
    :root {
        --header-height: 5rem;
    }
}

@media (min-width: 1024px) {
    :root {
        --header-height: 6rem;
    }
}

@media (min-width: 1280px) {
    :root {
        --header-height: 6.5rem;
    }
}

/* ========================================
   Mobile Responsive
   ======================================== */
@media (max-width: 768px) {
    .nav-list {
        gap: var(--space-sm);
    }
    
    .nav-list a:not(.nav-cta) {
        font-size: var(--text-sm);
        padding: var(--space-xs) var(--space-sm);
        min-height: 2.5rem;
        min-width: auto;
    }
}

@media (max-width: 480px) {
    :root {
        --header-height: 5.5rem;
        --header-padding-x: 0.75rem;
    }
    
    .logo {
        height: 3rem;
        max-width: 140px;
    }
    
    .nav-list {
        gap: var(--space-xs);
    }
    
    .nav-list a:not(.nav-cta) {
        font-size: var(--text-xs);
        padding: var(--space-xs) var(--space-xs);
        min-height: 2.25rem;
    }
    
    .nav-cta {
        min-height: 2.5rem !important;
        min-width: auto !important;
        padding: var(--space-xs) var(--space-sm) !important;
        font-size: var(--text-sm) !important;
        border-radius: var(--radius-md);
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .site-header,
    .skip-link {
        display: none !important;
    }
}

/* ========================================
   Reduced Motion (Accessibility)
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    .site-header {
        transition: none;
    }
    
    .nav-list a,
    .nav-list a::after,
    .nav-cta {
        transition: none !important;
    }
}

/* ========================================
   High Contrast Mode Support
   ======================================== */
@media (prefers-contrast: high) {
    .site-header {
        background-color: var(--color-white);
        border-bottom: 2px solid var(--color-black);
    }
    
    .nav-list a {
        text-decoration: underline;
    }
    
    .nav-cta {
        border: 2px solid var(--color-white);
    }
}