/**
 * Classic Menu Styles - Traditional Sidebar Navigation
 * 
 * Simple, reliable, and backward-compatible menu styling
 * Focus on functionality over fancy animations
 */

/* ========================================
   CLASSIC SIDEBAR CORE STYLES
   ======================================== */

.classic-menu-sidebar {
    --sidebar-width: 250px;
    --sidebar-bg: #ffffff;
    --sidebar-border: #dee2e6;
    --sidebar-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --menu-item-padding: 12px 16px;
    --menu-text-color: #495057;
    --menu-hover-bg: #f8f9fa;
    --menu-active-bg: #e9ecef;
    --menu-active-color: #0d6efd;
    --nested-indent: 20px;
    --transition-duration: 200ms;
}

.classic-menu-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    box-shadow: var(--sidebar-shadow);
    z-index: 1030;
    overflow-y: auto;
    overflow-x: hidden;
}

.classic-menu-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* ========================================
   HEADER STYLES
   ======================================== */

.classic-menu-header {
    padding: 20px 16px;
    border-bottom: 1px solid var(--sidebar-border);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.classic-menu-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #212529;
    font-weight: 600;
    font-size: 1.125rem;
}

.classic-menu-brand:hover {
    color: #212529;
    text-decoration: none;
}

.classic-menu-brand-logo {
    width: 32px;
    height: 32px;
    margin-right: 12px;
    border-radius: 4px;
}

.classic-menu-brand-text {
    font-weight: 600;
}

/* ========================================
   MENU CONTENT STYLES
   ======================================== */

.classic-menu-content {
    flex: 1;
    padding: 8px 0;
}

.classic-menu-nav {
    list-style: none;
    margin: 0;
    padding: 0;
}

.classic-menu-item {
    margin: 0;
    position: relative;
}

.classic-menu-link {
    display: flex;
    align-items: center;
    padding: var(--menu-item-padding);
    color: var(--menu-text-color);
    text-decoration: none;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    transition: all var(--transition-duration) ease;
    font-size: 0.875rem;
    font-weight: 500;
    position: relative;
}

.classic-menu-link:hover {
    color: var(--menu-text-color);
    background-color: var(--menu-hover-bg);
    text-decoration: none;
    transform: translateX(4px);
}

.classic-menu-link.active {
    color: var(--menu-active-color);
    background-color: var(--menu-active-bg);
    font-weight: 600;
    border-left: 3px solid var(--menu-active-color);
}

.classic-menu-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--menu-active-color), rgba(13, 110, 253, 0.7));
}

/* ========================================
   ICON STYLES
   ======================================== */

.classic-menu-icon {
    width: 20px;
    height: 20px;
    margin-right: 12px;
    font-size: 1rem;
    opacity: 0.8;
    transition: opacity var(--transition-duration) ease;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.classic-menu-link:hover .classic-menu-icon,
.classic-menu-link.active .classic-menu-icon {
    opacity: 1;
}

/* ========================================
   TEXT STYLES
   ======================================== */

.classic-menu-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ========================================
   BADGE STYLES
   ======================================== */

.classic-menu-badge {
    margin-left: auto;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 10px;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
    background-color: var(--bs-secondary);
    color: white;
}

.classic-menu-badge.badge-primary {
    background-color: var(--bs-primary);
}

.classic-menu-badge.badge-success {
    background-color: var(--bs-success);
}

.classic-menu-badge.badge-warning {
    background-color: var(--bs-warning);
    color: var(--bs-dark);
}

.classic-menu-badge.badge-danger {
    background-color: var(--bs-danger);
}

/* ========================================
   NESTED MENU STYLES
   ======================================== */

.classic-menu-submenu {
    background-color: rgba(248, 249, 250, 0.5);
    border-left: 2px solid #dee2e6;
    margin-left: var(--nested-indent);
}

.classic-menu-submenu .classic-menu-link {
    padding: 8px 16px 8px 24px;
    font-size: 0.8125rem;
    color: #6c757d;
    position: relative;
}

.classic-menu-submenu .classic-menu-link::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 50%;
    width: 6px;
    height: 1px;
    background-color: #dee2e6;
    transform: translateY(-50%);
}

.classic-menu-submenu .classic-menu-link:hover {
    background-color: #f8f9fa;
    color: var(--menu-text-color);
    transform: translateX(6px);
}

.classic-menu-submenu .classic-menu-link.active {
    background-color: #e3f2fd;
    color: var(--menu-active-color);
    border-left: none;
}

/* ========================================
   RESPONSIVE BEHAVIOR
   ======================================== */

/* Desktop Sidebar (Always Visible) */
@media (min-width: 992px) {
    .classic-menu-sidebar {
        position: fixed;
        transform: none !important;
        visibility: visible !important;
    }
    
    .main-content-with-sidebar {
        margin-left: var(--sidebar-width);
        transition: margin-left var(--transition-duration) ease;
    }
}

/* Tablet and Mobile */
@media (max-width: 991.98px) {
    .classic-menu-sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-duration) ease;
    }
    
    .classic-menu-sidebar.show {
        transform: translateX(0);
    }
    
    .classic-menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1025;
        opacity: 0;
        transition: opacity var(--transition-duration) ease;
        pointer-events: none;
    }
    
    .classic-menu-overlay.show {
        opacity: 1;
        pointer-events: auto;
    }
    
    .classic-menu-link {
        padding: 14px 16px;
        font-size: 1rem;
    }
    
    .classic-menu-submenu .classic-menu-link {
        padding: 12px 16px 12px 28px;
        font-size: 0.9375rem;
    }
}

/* ========================================
   THEME VARIANTS
   ======================================== */

/* Dark Theme */
.classic-menu-sidebar.theme-dark {
    --sidebar-bg: #212529;
    --sidebar-border: #495057;
    --menu-text-color: #adb5bd;
    --menu-hover-bg: #343a40;
    --menu-active-bg: #495057;
    --menu-active-color: #66d9ef;
}

.theme-dark .classic-menu-header {
    background: linear-gradient(135deg, #343a40 0%, #495057 100%);
    color: #f8f9fa;
}

.theme-dark .classic-menu-brand {
    color: #f8f9fa;
}

.theme-dark .classic-menu-brand:hover {
    color: #f8f9fa;
}

/* Light Theme (Default) */
.classic-menu-sidebar.theme-light {
    --sidebar-bg: #ffffff;
    --menu-text-color: #495057;
    --menu-hover-bg: #f8f9fa;
    --menu-active-bg: #e9ecef;
}

/* Transparent Theme */
.classic-menu-sidebar.theme-transparent {
    --sidebar-bg: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* ========================================
   BORDER STYLES
   ======================================== */

.classic-menu-sidebar.border-none {
    border-right: none;
    box-shadow: none;
}

.classic-menu-sidebar.border-subtle {
    border-right: 1px solid #dee2e6;
}

.classic-menu-sidebar.border-prominent {
    border-right: 3px solid var(--bs-primary);
}

/* ========================================
   SIZE VARIANTS
   ======================================== */

/* Text Sizes */
.classic-menu-sidebar.text-small .classic-menu-link {
    font-size: 0.8125rem;
}

.classic-menu-sidebar.text-large .classic-menu-link {
    font-size: 1rem;
}

/* Compact Mode */
.classic-menu-sidebar.compact .classic-menu-link {
    padding: 8px 12px;
}

.classic-menu-sidebar.compact .classic-menu-header {
    padding: 16px 12px;
}

.classic-menu-sidebar.compact .classic-menu-icon {
    margin-right: 8px;
}

/* ========================================
   LOADING STATES
   ======================================== */

.classic-menu-link.loading {
    pointer-events: none;
    opacity: 0.6;
}

.classic-menu-link.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 16px;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}

/* ========================================
   ACCESSIBILITY IMPROVEMENTS
   ======================================== */

.classic-menu-link:focus {
    outline: 2px solid var(--menu-active-color);
    outline-offset: 2px;
}

.classic-menu-toggle {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1040;
    display: none;
    background: var(--bs-primary);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 1.125rem;
}

@media (max-width: 991.98px) {
    .classic-menu-toggle {
        display: block;
    }
}

.classic-menu-toggle:hover {
    background: var(--bs-primary);
    transform: scale(1.05);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .classic-menu-sidebar {
        --sidebar-border: #000000;
        --menu-text-color: #000000;
        --menu-hover-bg: #ffffff;
        --menu-active-bg: #000000;
        --menu-active-color: #ffffff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .classic-menu-sidebar {
        --transition-duration: 0ms;
    }
    
    .classic-menu-link,
    .classic-menu-overlay,
    .classic-menu-toggle {
        transition: none;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .classic-menu-sidebar,
    .classic-menu-toggle,
    .classic-menu-overlay {
        display: none !important;
    }
    
    .main-content-with-sidebar {
        margin-left: 0 !important;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.classic-menu-divider {
    height: 1px;
    background-color: var(--sidebar-border);
    margin: 8px 16px;
}

.classic-menu-section-title {
    padding: 12px 16px 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: #6c757d;
    letter-spacing: 0.5px;
}

.classic-menu-footer {
    margin-top: auto;
    padding: 16px;
    border-top: 1px solid var(--sidebar-border);
    background: rgba(248, 249, 250, 0.5);
}

/* Mobile-specific adjustments */
@media (max-width: 575.98px) {
    .classic-menu-sidebar {
        width: 85vw;
    }
}

/* Touch-optimized elements */
@media (pointer: coarse) {
    .classic-menu-link {
        min-height: 44px;
        padding: 12px 16px;
    }
    
    .classic-menu-toggle {
        min-width: 44px;
        min-height: 44px;
    }
}