/* ═══════════════════════════════════════════════════════════
   MODERN BURGER MENU NAVIGATION SYSTEM
   Dark glassmorphic design with pink/purple/teal accents
   ═══════════════════════════════════════════════════════════ */

:root {
    /* Primary - From FeelReal logo */
    --fr-pink-light: #FF65B2;
    --fr-pink: #FF5AAE;
    --fr-pink-dark: #FF168A;

    /* Legacy variable mapping (for backwards compatibility) */
    --nav-primary: var(--fr-pink);
    --nav-primary-glow: rgba(255, 90, 174, 0.4);
    --nav-purple: #a855f7;

    /* Backgrounds */
    --fr-bg-primary: #0a0a0a;
    --fr-bg-secondary: #121212;
    --fr-bg-elevated: rgba(255, 255, 255, 0.03);

    --nav-bg-dark: rgba(10, 10, 10, 0.9);
    --nav-bg-glass: rgba(18, 18, 18, 0.85);

    /* Borders */
    --fr-border: rgba(255, 90, 174, 0.12);
    --nav-border: var(--fr-border);

    /* Text colors */
    --nav-text: rgba(255, 255, 255, 0.7);
    --nav-text-active: #ffffff;
    --nav-text-muted: rgba(255, 255, 255, 0.4);

    /* Dimensions */
    --nav-sidebar-expanded: 160px;
    --nav-sidebar-collapsed: 56px;
    --nav-drawer-width: 280px;
    --nav-mobile-header-height: 60px;
}

/* ═══════════════════════════════════════════════════════════
   BURGER MENU BUTTON
   ═══════════════════════════════════════════════════════════ */
.burger-menu-button {
    display: none; /* Hidden on desktop */
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
    position: relative;
    z-index: 1001;
    transition: transform 0.3s ease;
}

.burger-menu-button:active {
    transform: scale(0.95);
}

.burger-icon {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    position: relative;
}

.burger-line {
    width: 100%;
    height: 2px;
    background: var(--nav-primary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
    box-shadow: 0 0 8px var(--nav-primary-glow);
}

/* Hamburger to X animation */
.burger-menu-button.open .burger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.burger-menu-button.open .burger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.burger-menu-button.open .burger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ═══════════════════════════════════════════════════════════
   MOBILE HEADER BAR
   ═══════════════════════════════════════════════════════════ */
.mobile-header {
    display: none; /* Hidden on desktop */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-mobile-header-height);
    background: var(--nav-bg-dark);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--nav-border);
    z-index: 1000;
    padding: 0 1rem;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.mobile-header .logo {
    height: 32px;
    width: auto;
    max-width: 140px;
    object-fit: contain;
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION BACKDROP (Mobile Overlay)
   ═══════════════════════════════════════════════════════════ */
.nav-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1050;
    opacity: 0;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

.nav-backdrop.show {
    display: block;
    opacity: 1;
}

/* ═══════════════════════════════════════════════════════════
   MAIN NAVIGATION DRAWER / SIDEBAR
   ═══════════════════════════════════════════════════════════ */
.nav-drawer {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--nav-sidebar-expanded);
    background: var(--nav-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--nav-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 900;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    scrollbar-width: thin;
    scrollbar-color: var(--nav-primary-glow) transparent;
}

.nav-drawer::-webkit-scrollbar {
    width: 6px;
}

.nav-drawer::-webkit-scrollbar-track {
    background: transparent;
}

.nav-drawer::-webkit-scrollbar-thumb {
    background: var(--nav-primary-glow);
    border-radius: 10px;
}

/* Collapsed sidebar on desktop */
.nav-drawer.collapsed {
    width: var(--nav-sidebar-collapsed);
}

.nav-drawer.collapsed .nav-label {
    display: none;
}

.nav-drawer.collapsed .nav-item {
    justify-content: center;
    padding: 0.5rem;
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION HEADER
   ═══════════════════════════════════════════════════════════ */
.nav-header {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    min-height: 44px;
    position: relative;
}

.nav-header .collapse-btn {
    position: absolute;
    right: 0.5rem;
}

/* In collapsed state, reposition header elements */
.nav-drawer.collapsed .nav-header {
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.5rem 0.25rem;
}

.nav-drawer.collapsed .nav-header .collapse-btn {
    position: static;
    width: 28px;
    height: 28px;
}

.nav-drawer.collapsed .nav-logo {
    height: 24px;
}

.nav-logo {
    height: 28px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
}

.collapse-btn {
    background: transparent;
    border: 1px solid var(--nav-border);
    color: var(--nav-text);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.collapse-btn:hover {
    background: rgba(255, 107, 157, 0.1);
    border-color: var(--nav-primary);
    color: var(--nav-primary);
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION SECTIONS
   ═══════════════════════════════════════════════════════════ */
.nav-section {
    display: flex;
    flex-direction: column;
    padding: 0.5rem;
    gap: 0.125rem;
    overflow: visible;
}

.nav-primary {
    flex: 1;
}

/* Footer Navigation */
.nav-footer {
    display: flex;
    flex-direction: column;
    padding: 0.5rem;
    border-top: 1px solid var(--nav-border);
    gap: 0.125rem;
    overflow: visible;
}

.nav-footer .nav-item {
    opacity: 0.8;
}

.nav-footer .nav-item:hover {
    opacity: 1;
}

/* Logout Button */
.nav-logout {
    width: 100%;
    background: transparent;
    border: none;
    text-align: left;
    font-family: inherit;
    font-size: inherit;
}

.nav-logout:hover {
    background: rgba(255, 82, 82, 0.15);
}

.nav-logout:hover .nav-icon {
    fill: #ff5252;
}

/* Premium Item - Enhanced Styling with Gradient, Glow, and Badge */
.nav-item-premium {
    background: linear-gradient(135deg, var(--fr-pink) 0%, var(--nav-purple) 100%);
    color: #ffffff !important;
    position: relative;
    box-shadow: 0 4px 20px rgba(255, 90, 174, 0.5),
                0 0 30px rgba(168, 85, 247, 0.3);
    animation: premium-glow 2s ease-in-out infinite;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-item-premium:hover {
    background: linear-gradient(135deg, var(--fr-pink-dark) 0%, #9333ea 100%);
    box-shadow: 0 6px 30px rgba(255, 90, 174, 0.7),
                0 0 40px rgba(168, 85, 247, 0.5);
    transform: translateY(-2px);
}

.nav-item-premium .nav-icon {
    fill: #ffffff;
    filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.5));
}

.nav-item-premium .nav-label {
    font-weight: 700;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

@keyframes premium-glow {
    0%, 100% {
        box-shadow: 0 4px 20px rgba(255, 90, 174, 0.5),
                    0 0 30px rgba(168, 85, 247, 0.3);
    }
    50% {
        box-shadow: 0 4px 25px rgba(255, 90, 174, 0.7),
                    0 0 40px rgba(168, 85, 247, 0.5);
    }
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION ITEMS
   ═══════════════════════════════════════════════════════════ */
.nav-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    color: var(--nav-text);
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 4px;
    bottom: 4px;
    width: 2px;
    border-radius: 1px;
    background: linear-gradient(180deg, var(--nav-primary), var(--nav-purple));
    opacity: 0;
    transition: opacity 0.2s ease;
}

.nav-item:hover {
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.15), rgba(168, 85, 247, 0.1));
    color: var(--nav-text-active);
}

.nav-item.active {
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.25), rgba(168, 85, 247, 0.15));
    color: var(--nav-text-active);
    box-shadow: 0 2px 8px rgba(255, 107, 157, 0.25);
}

.nav-item.active::before {
    opacity: 1;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    fill: currentColor;
}

.nav-label {
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

/* Icon with badge container */
.nav-icon-badge {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Green notification dot for Explore */
.nav-notification-dot {
    position: absolute;
    top: -2px;
    right: -4px;
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    border: 1.5px solid var(--fr-bg-primary);
    box-shadow: 0 0 6px rgba(34, 197, 94, 0.6);
    animation: nav-pulse-dot 2s ease-in-out infinite;
}

@keyframes nav-pulse-dot {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    25% {
        opacity: 0.4;
    }
    50% {
        transform: scale(1.15);
        opacity: 0.9;
    }
    75% {
        opacity: 0.5;
    }
}


/* ═══════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════ */

/* Desktop (>1024px) */
@media (min-width: 1025px) {
    .nav-drawer {
        display: flex;
    }

    .mobile-header,
    .burger-menu-button {
        display: none;
    }
}

/* Tablet (768-1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .nav-drawer {
        display: flex;
        width: var(--nav-sidebar-collapsed);
    }

    .nav-drawer .nav-label {
        display: none;
    }

    .nav-drawer .nav-item {
        justify-content: center;
        padding: 0.5rem;
    }

    .mobile-header,
    .burger-menu-button {
        display: none;
    }
}

/* Mobile (<768px) */
@media (max-width: 767px) {
    .mobile-header {
        display: flex;
    }

    .burger-menu-button {
        display: block;
    }

    .nav-drawer {
        width: auto;
        min-width: 140px;
        max-width: 200px;
        transform: translateX(-100%);
        z-index: 1100;
        box-shadow: 2px 0 20px rgba(0, 0, 0, 0.5);
        /* Anchor to visible top and bottom - fixes iOS viewport issues */
        top: 0;
        bottom: 0;
        height: auto;
        padding-bottom: env(safe-area-inset-bottom);
    }

    .nav-drawer.open {
        transform: translateX(0);
    }

    /* Hide collapse button on mobile - use backdrop to close */
    .nav-drawer .collapse-btn {
        display: none;
    }

    /* Override collapsed state on mobile - always show full menu */
    .nav-drawer.collapsed {
        width: auto;
        min-width: 140px;
        max-width: 200px;
    }

    .nav-drawer.collapsed .nav-label {
        display: block;
    }

    .nav-drawer.collapsed .nav-item {
        justify-content: flex-start;
        flex-direction: row;
    }

    /* Compact header on mobile */
    .nav-drawer .nav-header {
        padding: 0.5rem;
        justify-content: center;
        min-height: 36px;
    }

    .nav-drawer .nav-logo {
        height: 24px;
    }

    /* Compact nav items on mobile */
    .nav-drawer .nav-section {
        padding: 0.375rem;
        gap: 0.125rem;
    }

    /* Nav primary - flex to push footer to bottom */
    .nav-drawer .nav-primary {
        flex: 1;
        overflow: visible;
    }

    .nav-drawer .nav-item {
        padding: 0.35rem 0.5rem;
        gap: 0.4rem;
        border-radius: 6px;
        flex-direction: row;
    }

    .nav-drawer .nav-icon {
        width: 16px;
        height: 16px;
    }

    .nav-drawer .nav-label {
        font-size: 0.75rem;
        font-weight: 500;
    }

    .nav-drawer .nav-footer {
        padding: 0.375rem;
        gap: 0.125rem;
    }

    .nav-drawer .nav-footer .nav-item {
        padding: 0.35rem 0.5rem;
    }

    /* Premium button - more compact on mobile */
    .nav-drawer .nav-item-premium {
        padding: 0.35rem 0.5rem;
    }

    /* Ensure proper spacing for mobile header */
    .main-content {
        padding-top: var(--nav-mobile-header-height);
    }

    /* Remove padding on chat page - it has its own header */
    .on-chat-page .main-content {
        padding-top: 0;
    }
}

/* ═══════════════════════════════════════════════════════════
   ACCESSIBILITY
   ═══════════════════════════════════════════════════════════ */
.nav-item:focus-visible,
.premium-btn:focus-visible,
.collapse-btn:focus-visible,
.burger-menu-button:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .nav-drawer,
    .nav-backdrop,
    .burger-line,
    .nav-item,
    .premium-btn {
        transition: none;
        animation: none;
    }
}

/* ═══════════════════════════════════════════════════════════
   GLOBAL - Content offset for collapsed sidebar
   ═══════════════════════════════════════════════════════════ */
/* When sidebar is collapsed, adjust main content left position */
body:has(.nav-drawer.collapsed) .desktop-redirect {
    left: var(--nav-sidebar-collapsed, 56px) !important;
}