/**
 * Humbrella Design System - Navigation
 * Version: 1.1 - Collapsible sidebar, flexbox footer fix
 * 
 * Desktop sidebar, mobile FAB navigation, and site header.
 * Requires: variables.css
 */

/* =========================================
   DESKTOP SIDEBAR NAVIGATION
   ========================================= */
.sidebar-navigation {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: var(--gradient-brand-vertical);
    backdrop-filter: blur(10px);
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.2);
    z-index: var(--z-sidebar);
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
}

.sidebar-brand {
    padding: var(--space-8) var(--space-5);
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.sidebar-brand h2 {
    color: var(--color-gold);
    font-size: var(--text-3xl);
    font-family: var(--font-heading);
    margin: 0;
    font-weight: var(--font-bold);
}

.sidebar-brand .brand-icon {
    display: none;
    font-size: 1.8rem;
}

.brand-tagline {
    color: var(--color-gold-light);
    font-size: var(--text-sm);
    margin: var(--space-1) 0 0 0;
    opacity: 0.9;
}

.sidebar-menu {
    list-style: none;
    padding: var(--space-5) 0;
    margin: 0;
    flex: 1;
    overflow-y: auto;
}

.sidebar-menu li {
    margin: 0;
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.sidebar-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0;
    background: var(--glass-gold);
    transition: width var(--transition);
}

.sidebar-link:hover {
    text-decoration: none;
}

.sidebar-link:hover::before {
    width: 100%;
}

.sidebar-link:hover {
    color: var(--color-gold);
    padding-left: calc(var(--space-6) + 10px);
}

.sidebar-link.active {
    background: var(--glass-gold);
    color: var(--color-gold);
    border-left: var(--border-width-4) solid var(--color-gold);
}

.sidebar-link.featured {
    background: rgba(255, 214, 89, 0.1);
}

.sidebar-icon {
    font-size: var(--text-xl);
    width: 30px;
    display: inline-block;
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.sidebar-text {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    letter-spacing: var(--tracking-wide);
    position: relative;
    z-index: 1;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity 0.2s ease;
}

.sidebar-footer {
    flex-shrink: 0;
    padding: var(--space-3) var(--space-5);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Collapse Toggle Button */
.sidebar-collapse-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.6);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    margin: 0 auto;
}

.sidebar-collapse-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-gold);
}

.collapse-icon-closed {
    display: none;
}

/* =========================================
   COLLAPSED SIDEBAR STATE
   ========================================= */
.sidebar-navigation.collapsed {
    width: 60px;
}

.sidebar-navigation.collapsed .brand-full,
.sidebar-navigation.collapsed .brand-tagline {
    display: none;
}

.sidebar-navigation.collapsed .brand-icon {
    display: block;
}

.sidebar-navigation.collapsed .sidebar-brand {
    padding: 12px 8px;
}

.sidebar-navigation.collapsed .sidebar-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar-navigation.collapsed .sidebar-link {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
}

.sidebar-navigation.collapsed .sidebar-link:hover {
    padding-left: 0;
}

.sidebar-navigation.collapsed .sidebar-icon {
    width: auto;
    text-align: center;
}

.sidebar-navigation.collapsed .collapse-icon-open {
    display: none;
}

.sidebar-navigation.collapsed .collapse-icon-closed {
    display: inline;
}

/* Body margin adjustment when sidebar is collapsed */
body.sidebar-collapsed.has-sidebar {
    margin-left: 60px;
}

/* Sidebar menu animations */
.sidebar-menu li {
    animation: fadeInLeft 0.5s ease;
    animation-fill-mode: both;
}

.sidebar-menu li:nth-child(1) { animation-delay: 0.1s; }
.sidebar-menu li:nth-child(2) { animation-delay: 0.15s; }
.sidebar-menu li:nth-child(3) { animation-delay: 0.2s; }
.sidebar-menu li:nth-child(4) { animation-delay: 0.25s; }
.sidebar-menu li:nth-child(5) { animation-delay: 0.3s; }
.sidebar-menu li:nth-child(6) { animation-delay: 0.35s; }
.sidebar-menu li:nth-child(7) { animation-delay: 0.4s; }
.sidebar-menu li:nth-child(8) { animation-delay: 0.45s; }

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* =========================================
   MOBILE FAB NAVIGATION
   ========================================= */
.fab-nav-container {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: var(--z-fab);
}

.fab-main-btn {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: var(--gradient-brand);
    border: none;
    color: var(--color-white);
    font-size: var(--text-2xl);
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.fab-main-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.fab-main-btn.active {
    background: var(--gradient-brand-reverse);
    transform: rotate(90deg);
}

.fab-icon-closed {
    display: block;
}

.fab-icon-open {
    display: none;
}

.fab-main-btn.active .fab-icon-closed {
    display: none;
}

.fab-main-btn.active .fab-icon-open {
    display: block;
}

.fab-menu {
    position: absolute;
    bottom: 70px;
    right: 0;
    display: none;
    flex-direction: column-reverse;
    gap: var(--space-2);
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--transition);
}

.fab-menu.active {
    display: flex;
    opacity: 1;
    transform: scale(1);
}

.fab-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--color-white);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-full);
    text-decoration: none;
    color: var(--color-text);
    box-shadow: var(--shadow-md);
    white-space: nowrap;
    transition: all var(--transition);
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fab-menu-item:hover {
    background: var(--gradient-brand);
    color: var(--color-white);
    transform: translateX(-10px);
    text-decoration: none;
}

.fab-menu-item.featured {
    background: var(--gradient-gold);
    color: var(--color-text);
    font-weight: var(--font-bold);
}

.fab-item-icon {
    font-size: var(--text-lg);
}

.fab-item-text {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    letter-spacing: var(--tracking-wide);
}

/* =========================================
   SITE HEADER (for pages without sidebar)
   ========================================= */
.site-header {
    position: sticky;
    top: 0;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-sticky);
    padding: var(--space-4) var(--space-5);
}

.header-inner {
    max-width: var(--container-xl);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--color-primary);
}

.header-logo img {
    height: 40px;
    width: auto;
}

.header-logo span {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.header-nav a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-medium);
    transition: color var(--transition-fast);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

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

/* Tablet (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .sidebar-navigation {
        width: var(--sidebar-width-tablet);
    }
    
    .sidebar-text {
        font-size: var(--text-xs);
    }
}

/* Mobile (768px and below) */
@media (max-width: 768px) {
    /* Hide sidebar on mobile */
    .sidebar-navigation {
        display: none;
    }
    
    /* Show FAB navigation on mobile */
    .fab-nav-container {
        display: block;
    }
    
    /* Header adjustments */
    .header-nav {
        display: none;
    }
}

/* =========================================
   PAGE TRANSITION EFFECT
   ========================================= */
body {
    opacity: 1;
    transition: opacity var(--transition);
}

body.page-transitioning {
    opacity: 0;
}