/**
 * Equipment Navigation - Accessible Expandable Menu
 * Desktop sidebar + Mobile collapsible
 * Adapted from demo-navigation.css for 2-level equipment categories
 * WCAG 2.1 Level AA Compliant
 */

/* ==========================================================================
   Layout - Desktop Sidebar + Main Content
   ========================================================================== */

.equipment-content-wrapper {
    display: flex;
    gap: 2rem;
    margin-top: 0;
}

/* Sidebar navigation - Desktop (positioned on right) */
.equipment-navigation {
    flex-shrink: 0;
    width: 320px;
    order: 2; /* Place navigation on right side */
    min-width: 0;
}

/* Main content area (positioned on left) */
.equipment-main-content {
    flex-grow: 1;
    min-width: 0; /* Prevent flex overflow */
    order: 1; /* Place content on left side */
}

/* ==========================================================================
   Mobile Toggle Button (Hidden on Desktop)
   ========================================================================== */

.equipment-nav-mobile-toggle {
    display: none; /* Hidden on desktop */
    width: 100%;
    padding: 1rem;
    background: var(--ucb-dark-gray);
    color: var(--ucb-light-gray);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition-fast);
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

.equipment-nav-mobile-toggle .icon-menu {
    fill: currentColor;
}

.equipment-nav-mobile-toggle .icon-chevron {
    fill: currentColor;
    margin-left: auto;
    transition: transform 0.3s;
}

.equipment-nav-mobile-toggle[aria-expanded="true"] .icon-chevron {
    transform: rotate(180deg);
}

.equipment-nav-mobile-toggle:hover,
.equipment-nav-mobile-toggle:focus-visible {
    background: var(--nav-hover-bg);
    border-color: var(--ucb-gold);
}

.equipment-nav-mobile-toggle:focus-visible {
    outline: 3px solid var(--ucb-gold);
    outline-offset: 2px;
}

/* ==========================================================================
   Navigation Menu Container
   ========================================================================== */

.equipment-nav-menu {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-md);
    padding: 1rem;
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* ==========================================================================
   Navigation Heading
   ========================================================================== */

.equipment-nav-heading {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* ==========================================================================
   Collapse All Button
   ========================================================================== */

.equipment-nav-collapse-all {
    width: 100%;
    padding: 0.75rem;
    background: var(--ucb-dark-gray);
    color: var(--ucb-light-gray);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: var(--transition-fast);
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

.equipment-nav-collapse-all:hover {
    background: var(--nav-hover-bg);
}

.equipment-nav-collapse-all:focus-visible {
    outline: 3px solid var(--ucb-gold);
    outline-offset: 2px;
}

/* ==========================================================================
   Navigation Tree
   ========================================================================== */

.equipment-nav-tree {
    max-height: calc(100vh - 300px); /* Limit height, enable scrolling */
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 0.5rem; /* Space between content and scrollbar */
}

/* Custom scrollbar for webkit browsers */
.equipment-nav-tree::-webkit-scrollbar {
    width: 8px;
}

.equipment-nav-tree::-webkit-scrollbar-track {
    background: var(--scrollbar-track-bg);
    border-radius: var(--radius-sm);
}

.equipment-nav-tree::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb-bg);
    border-radius: var(--radius-sm);
}

.equipment-nav-tree::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover-bg);
}

/* ==========================================================================
   Navigation Items - Hierarchical Structure
   ========================================================================== */

.equipment-nav-item {
    margin-bottom: 0.25rem;
}

.equipment-nav-item-row {
    display: flex;
    align-items: stretch;
    gap: 2px;
}

/* Navigation Links */
.equipment-nav-link {
    flex-grow: 1;
    display: flex;
    align-items: center;
    padding: 0.75rem;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    min-height: 44px; /* WCAG minimum touch target */
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Level 1 - Topics (9A, 9B, 9C) - Dark gray */
.equipment-nav-topic {
    background: var(--ucb-dark-gray);
    color: var(--ucb-white);
    font-weight: 600;
}

.equipment-nav-topic:hover,
.equipment-nav-topic:focus-visible {
    background: var(--nav-hover-bg);
    color: var(--ucb-white);
}

.equipment-nav-topic:visited {
    background-color: var(--ucb-dark-gray) !important;
    color: var(--ucb-white) !important;
}

.equipment-nav-topic:visited:hover,
.equipment-nav-topic:visited:focus-visible {
    background-color: var(--nav-hover-bg) !important;
    color: var(--ucb-white) !important;
}

/* Level 2 - Concepts (9A10, 9B20, etc.) - UCB Gold */
.equipment-nav-concept {
    background: var(--ucb-gold);
    color: var(--ucb-black);
    margin-left: 1rem;
    font-weight: 600;
}

.equipment-nav-concept:hover,
.equipment-nav-concept:focus-visible {
    background: var(--ucb-gold-dark);
    color: var(--ucb-black);
}

.equipment-nav-concept:visited {
    background-color: var(--ucb-gold) !important;
    color: var(--ucb-black) !important;
}

.equipment-nav-concept:visited:hover,
.equipment-nav-concept:visited:focus-visible {
    background-color: var(--ucb-gold-dark) !important;
    color: var(--ucb-black) !important;
}

/* Focus states for all links */
.equipment-nav-link:focus-visible {
    outline: 3px solid var(--ucb-gold);
    outline-offset: 2px;
}

/* ==========================================================================
   Expand/Collapse Toggle Buttons
   ========================================================================== */

.equipment-nav-toggle {
    flex-shrink: 0;
    width: 44px; /* WCAG minimum */
    min-height: 44px; /* WCAG minimum - allows stretching to match link height */
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Match button colors to level */
.equipment-nav-level-1 .equipment-nav-toggle {
    background: var(--ucb-dark-gray);
    color: var(--ucb-light-gray);
}

.equipment-nav-level-2 .equipment-nav-toggle {
    background: var(--ucb-gold);
    color: var(--ucb-black);
}

/* Hover states */
.equipment-nav-level-1 .equipment-nav-toggle:hover {
    background: var(--nav-hover-bg);
}

.equipment-nav-level-2 .equipment-nav-toggle:hover {
    background: var(--ucb-gold-dark);
}

/* Focus states */
.equipment-nav-toggle:focus-visible {
    outline: 3px solid var(--ucb-gold);
    outline-offset: 2px;
}

/* Chevron icons */
.equipment-nav-toggle svg {
    fill: currentColor;
    transition: transform 0.3s;
}

.equipment-nav-toggle[aria-expanded="true"] .icon-chevron-down {
    display: none;
}

.equipment-nav-toggle[aria-expanded="true"] .icon-chevron-up {
    display: block !important;
}

.equipment-nav-toggle[aria-expanded="false"] .icon-chevron-down {
    display: block;
}

.equipment-nav-toggle[aria-expanded="false"] .icon-chevron-up {
    display: none;
}

/* ==========================================================================
   Submenu Containers
   ========================================================================== */

.equipment-nav-submenu {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
}

.equipment-nav-submenu[hidden] {
    display: none;
}

/* Smooth reveal animation */
@media (prefers-reduced-motion: no-preference) {
    .equipment-nav-submenu {
        animation: slideDown 0.3s ease-out;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}

/* ==========================================================================
   Mobile Styles (max-width: 991px)
   ========================================================================== */

@media (max-width: 991px) {
    /* Stack layout on mobile */
    .equipment-content-wrapper {
        flex-direction: column;
    }

    /* Full width navigation */
    .equipment-navigation {
        width: 100%;
    }

    /* Show mobile toggle button */
    .equipment-nav-mobile-toggle {
        display: flex;
    }

    /* Hide menu by default on mobile */
    .equipment-nav-menu {
        display: none;
        margin-top: 1rem;
    }

    .equipment-nav-menu.is-open {
        display: block;
    }

    /* Adjust tree height for mobile */
    .equipment-nav-tree {
        max-height: 70vh;
    }

    /* Reduce indentation on mobile */
    .equipment-nav-concept {
        margin-left: 0.5rem;
    }

    /* Slightly smaller fonts on mobile */
    .equipment-nav-link {
        font-size: 0.9rem;
        padding: 0.65rem;
    }
}

/* ==========================================================================
   Tablet Styles (768px - 991px)
   ========================================================================== */

@media (min-width: 768px) and (max-width: 991px) {
    .equipment-navigation {
        width: 100%;
    }

    /* Slightly more generous spacing on tablets */
    .equipment-nav-concept {
        margin-left: 0.75rem;
    }
}

/* ==========================================================================
   Large Desktop Styles (1400px+)
   ========================================================================== */

@media (min-width: 1400px) {
    .equipment-content-wrapper {
        gap: 2.5rem;
    }

    .equipment-navigation {
        width: 340px;
    }
}

/* ==========================================================================
   Reduced Motion Support
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .equipment-nav-submenu,
    .equipment-nav-toggle svg,
    .equipment-nav-mobile-toggle .icon-chevron {
        animation: none !important;
        transition: none !important;
    }
}

/* ==========================================================================
   Dark Mode Overrides
   ========================================================================== */

[data-theme="dark"] .equipment-nav-menu {
    background: var(--bg-elevated);
    border-color: var(--border-color);
}

[data-theme="dark"] .equipment-nav-heading {
    color: var(--text-primary);
}

[data-theme="dark"] .equipment-nav-tree::-webkit-scrollbar-track {
    background: var(--scrollbar-track-bg);
}

[data-theme="dark"] .equipment-nav-tree::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb-bg);
}

[data-theme="dark"] .equipment-nav-tree::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover-bg);
}

/* Keep navigation buttons with same colors in dark mode for consistency */
/* Level 2 (Concepts) - Adjust gold to lighter shade for dark mode */
[data-theme="dark"] .equipment-nav-concept {
    background: var(--ucb-gold-light);
    color: var(--ucb-black);
}

[data-theme="dark"] .equipment-nav-concept:hover,
[data-theme="dark"] .equipment-nav-concept:focus-visible {
    background: var(--ucb-gold-dark);
    color: var(--ucb-black);
}

[data-theme="dark"] .equipment-nav-concept:visited {
    background-color: var(--ucb-gold-light) !important;
    color: var(--ucb-black) !important;
}

[data-theme="dark"] .equipment-nav-concept:visited:hover,
[data-theme="dark"] .equipment-nav-concept:visited:focus-visible {
    background-color: var(--ucb-gold-dark) !important;
    color: var(--ucb-black) !important;
}

/* ==========================================================================
   Info Box Section (Global Utility)
   ========================================================================== */

.equipment-nav-info-box {
    margin-top: 1.25rem;
    padding: 1rem;
    background-color: var(--info-box-bg);
    border: 1px solid var(--info-box-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.equipment-nav-info-box h3 {
    margin: 0 0 0.5rem 0;
    font-weight: 500;
    font-size: var(--font-size-base);
}

.equipment-nav-info-box p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--info-box-text);
    line-height: 1.5;
}

.equipment-nav-info-box a {
    color: var(--ucb-gold);
    font-weight: 500;
    text-decoration: none;
}

.equipment-nav-info-box a:hover,
.equipment-nav-info-box a:focus-visible {
    text-decoration: underline;
}

.equipment-nav-info-box a:focus-visible {
    outline: 3px solid var(--ucb-gold);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Dark mode support for info box */
[data-theme="dark"] .equipment-nav-info-box {
    background-color: var(--bg-elevated);
    border-color: var(--border-color);
}

[data-theme="dark"] .equipment-nav-info-box p,
[data-theme="dark"] .equipment-nav-info-box h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .equipment-nav-info-box a {
    color: var(--ucb-gold);
}

[data-theme="dark"] .equipment-nav-info-box a:visited {
    color: var(--ucb-gold-dark);
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .equipment-nav-mobile-toggle,
    .equipment-nav-collapse-all {
        display: none;
    }

    .equipment-nav-submenu[hidden] {
        display: block !important;
    }

    .equipment-nav-toggle {
        display: none;
    }
}