/*
 * Advanced Intelligent Navbar System v6.1.0
 * Features:
 * - Adaptive layout with collision detection
 * - Smart responsive breakpoints
 * - Context-aware behavior (scroll, page type)
 * - Advanced animations with proper easing
 * - Multi-tier hierarchy system
 * - Performance optimized (GPU acceleration)
 * - Full accessibility support
 */

/* ============================================
   PART 1: INTELLIGENT LAYOUT SYSTEM
   ============================================ */

.site-header {
    --header-height: clamp(60px, 8vh, 80px);
    --header-padding-x: clamp(16px, 4vw, 48px);
    --header-padding-y: clamp(12px, 2vh, 20px);
    --header-gap: clamp(12px, 2vw, 32px);
    --header-transition: cubic-bezier(0.4, 0.0, 0.2, 1) 0.35s;
    --header-blur: 24px;
    --header-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
    
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    -webkit-backdrop-filter: blur(var(--header-blur));
    backdrop-filter: blur(var(--header-blur));
    box-shadow: var(--header-shadow);
    transition: transform var(--header-transition),
                box-shadow var(--header-transition),
                background var(--header-transition);
    will-change: transform, background;
}

/* Scroll States */
.site-header.is-scrolled {
    --header-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

.site-header.is-hidden {
    transform: translateY(-100%);
}

.site-header.is-revealing {
    transform: translateY(0);
}

/* Layout Container */
.site-header__inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-areas: "branding nav actions";
    align-items: center;
    gap: var(--header-gap);
    max-width: var(--container-wide, 1920px);
    margin: 0 auto;
    padding: var(--header-padding-y) var(--header-padding-x);
    min-height: var(--header-height);
}

/* Adaptive Layout States */
@media (max-width: 1279px) {
    .site-header__inner {
        grid-template-columns: auto auto 1fr auto;
        grid-template-areas: "branding nav . actions";
    }
}

@media (max-width: 959px) {
    .site-header__inner {
        grid-template-columns: auto 1fr auto;
        grid-template-areas: 
            "branding . actions"
            "nav nav nav";
    }
}

/* ============================================
   PART 2: BRANDING ZONE (INTELLIGENT SCALING)
   ============================================ */

.branding {
    grid-area: branding;
    display: flex;
    align-items: center;
    gap: clamp(8px, 1.5vw, 16px);
    min-width: 0; /* Allow flex shrink */
}

.branding__logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.branding__logo:hover {
    transform: scale(1.05) rotate(2deg);
}

.branding__logo svg,
.branding__logo img {
    width: clamp(32px, 4.5vw, 44px);
    height: clamp(32px, 4.5vw, 44px);
    display: block;
}

.branding__text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.branding__link {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
}

.branding__link:hover {
    opacity: 0.8;
}

.branding__title {
    font-size: clamp(0.85rem, 1.8vw, 1.25rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-primary);
    white-space: nowrap;
    overflow: visible; /* CRITICAL: Never truncate */
    text-overflow: clip;
}

/* ============================================
   PART 3: NAVIGATION (ADAPTIVE MENU SYSTEM)
   ============================================ */

.primary-nav {
    grid-area: nav;
    display: flex;
    justify-content: center;
    align-items: center;
}

.primary-nav .menu {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(4px, 1vw, 8px);
    list-style: none;
    margin: 0;
    padding: clamp(6px, 1vh, 12px) clamp(12px, 2vw, 24px);
    background: var(--color-surface-alt);
    border-radius: 999px;
    border: 1px solid var(--color-border);
    transition: all var(--header-transition);
}

.primary-nav .menu-item {
    position: relative;
}

.primary-nav .menu-item > a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: clamp(8px, 1.2vh, 12px) clamp(12px, 1.8vw, 20px);
    font-size: clamp(0.875rem, 1.4vw, 1rem);
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: 999px;
    transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

/* Smart Hover Effects */
.primary-nav .menu-item > a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-primary);
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: -1;
}

.primary-nav .menu-item > a:hover::before {
    opacity: 0.1;
}

.primary-nav .menu-item > a:hover {
    color: var(--color-primary);
    transform: translateY(-1px);
}

/* Active State */
.primary-nav .menu-item.current-menu-item > a,
.primary-nav .menu-item.current_page_item > a {
    color: var(--color-text);
    background: var(--color-primary);
    color: #FFFFFF;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.3);
}

/* CTA Menu Item */
.primary-nav .menu-item.menu-item-cta > a {
    background: var(--color-primary);
    color: #FFFFFF;
    font-weight: 600;
    padding: clamp(8px, 1.2vh, 12px) clamp(16px, 2.5vw, 24px);
    box-shadow: 0 2px 12px rgba(0, 102, 204, 0.2);
}

.primary-nav .menu-item.menu-item-cta > a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 102, 204, 0.3);
}

.primary-nav .menu-item.menu-item-cta > a::before {
    opacity: 0;
}

/* ============================================
   PART 4: ACTIONS ZONE (SMART CONTROLS)
   ============================================ */

.site-header__actions {
    grid-area: actions;
    display: flex;
    align-items: center;
    gap: clamp(8px, 1.2vw, 16px);
    justify-content: flex-end;
}

/* Search System */
.header-search {
    position: relative;
    display: flex; /* Visible on desktop by default */
    align-items: center;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    padding: clamp(6px, 1vh, 10px) clamp(12px, 1.8vw, 20px);
    transition: all var(--header-transition);
    max-width: clamp(200px, 25vw, 320px);
}

.header-search:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.header-search__button {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color 0.2s ease;
}

.header-search__button:hover {
    color: var(--color-primary);
}

.header-search__icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.header-search__input {
    border: none;
    background: transparent;
    color: var(--color-text);
    font-size: clamp(0.875rem, 1.4vw, 1rem);
    padding: 0 clamp(8px, 1.2vw, 12px);
    flex: 1;
    min-width: 0;
    outline: none;
}

.header-search__input::placeholder {
    color: var(--color-text-muted);
}

/* Newsletter CTA Button */
.newsletter-cta {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: clamp(8px, 1.2vh, 12px) clamp(16px, 2vw, 24px);
    background: var(--color-primary);
    color: #FFFFFF;
    border: none;
    border-radius: 999px;
    font-size: clamp(0.875rem, 1.4vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 2px 12px rgba(0, 102, 204, 0.2);
    white-space: nowrap;
}

.newsletter-cta:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 16px rgba(0, 102, 204, 0.3);
}

.newsletter-cta:active {
    transform: translateY(0) scale(0.98);
}

.newsletter-cta svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: currentColor;
}

/* Theme Controls - Hidden from navbar (available in footer/chat only) */
.theme-controls {
    display: none;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: clamp(6px, 1vh, 10px) clamp(10px, 1.5vw, 16px);
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: clamp(0.8rem, 1.2vw, 0.9rem);
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-primary);
}

.theme-toggle__icon {
    width: 16px;
    height: 16px;
    position: relative;
}

.theme-toggle__icon svg {
    position: absolute;
    inset: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

[data-theme="dark"] .theme-icon--sun {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="light"] .theme-icon--moon,
[data-theme="system"] .theme-icon--moon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .theme-icon--moon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="light"] .theme-icon--sun,
[data-theme="system"] .theme-icon--sun {
    opacity: 1;
    transform: rotate(0deg);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: 8px;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-toggle:hover {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.nav-toggle__bar {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    position: relative;
}

.nav-toggle:hover .nav-toggle__bar {
    background: #FFFFFF;
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: inherit;
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.nav-toggle__bar::before {
    top: -6px;
}

.nav-toggle__bar::after {
    bottom: -6px;
}

/* Hamburger Animation */
.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
    background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ============================================
   PART 5: RESPONSIVE BEHAVIOR (INTELLIGENT)
   ============================================ */

/* Tablet Compact Mode (960-1279px) */
@media (max-width: 1279px) {
    .site-header__actions .newsletter-cta__label {
        display: none;
    }
    
    .newsletter-cta {
        padding: clamp(8px, 1.2vh, 12px);
        width: 44px;
        height: 44px;
        justify-content: center;
    }
    
    .theme-toggle__label {
        display: none;
    }
}

/* Mobile Navigation (< 960px) */
@media (max-width: 959px) {
    .nav-toggle {
        display: flex;
    }
    
    .primary-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-surface);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: all var(--header-transition);
        overflow-y: auto;
        z-index: 999;
    }
    
    .primary-nav.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .primary-nav .menu {
        flex-direction: column;
        width: 100%;
        max-width: 600px;
        margin: 24px auto;
        padding: 16px;
        border-radius: 16px;
        gap: 8px;
    }
    
    .primary-nav .menu-item > a {
        width: 100%;
        justify-content: center;
        padding: 16px 24px;
        font-size: 1rem;
    }
    
    /* Hide search on mobile (desktop search is cleaner) */
    .header-search {
        display: none;
    }
    
    /* Hide newsletter CTA label on mobile */
    .site-header__actions .newsletter-cta__label {
        display: none;
    }
    
    .newsletter-cta {
        width: 44px;
        height: 44px;
        padding: 12px;
        justify-content: center;
    }
}

/* Ultra-Small Screens (< 375px) */
@media (max-width: 374px) {
    .branding__title {
        font-size: 0.75rem;
    }
    
    .newsletter-cta {
        width: 40px;
        height: 40px;
        padding: 8px;
    }
    
    .nav-toggle {
        width: 40px;
        height: 40px;
    }
}

/* ============================================
   PART 6: DARK MODE REFINEMENTS
   ============================================ */

[data-theme="dark"] .site-header {
    background: rgba(10, 10, 15, 0.9);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .primary-nav .menu {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .header-search,
[data-theme="dark"] .theme-toggle,
[data-theme="dark"] .nav-toggle,
[data-theme="dark"] .header-search-toggle {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

/* ============================================
   PART 7: PERFORMANCE OPTIMIZATIONS
   ============================================ */

.site-header,
.primary-nav,
.header-search,
.newsletter-cta,
.theme-toggle,
.nav-toggle {
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

/* ============================================
   PART 8: ACCESSIBILITY ENHANCEMENTS
   ============================================ */

.skip-link:focus {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10001;
    padding: 16px 24px;
    background: var(--color-primary);
    color: #FFFFFF;
    text-decoration: none;
    border-radius: 0 0 8px 8px;
    font-weight: 600;
}

/* Focus Visible States */
.primary-nav .menu-item > a:focus-visible,
.header-search__input:focus-visible,
.newsletter-cta:focus-visible,
.theme-toggle:focus-visible,
.nav-toggle:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .site-header,
    .primary-nav,
    .primary-nav .menu-item > a,
    .newsletter-cta,
    .theme-toggle,
    .nav-toggle,
    .nav-toggle__bar,
    .nav-toggle__bar::before,
    .nav-toggle__bar::after {
        transition: none !important;
        animation: none !important;
    }
}

/* ============================================
   PART 9: PRINT STYLES
   ============================================ */

@media print {
    .site-header {
        position: relative;
        box-shadow: none;
        border-bottom: 2px solid #000;
    }
    
    .site-header__actions,
    .header-search,
    .nav-toggle,
    .theme-controls {
        display: none;
    }
    
    .primary-nav .menu {
        padding: 8px;
        background: transparent;
        border: none;
    }
}