/* =============================================================================
   SIDEBAR NAVIGATION STYLES
   ============================================================================= */

/* CSS Variables for Sidebar */
:root {
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 60px;
    --sidebar-bg: #2c3e50;
    --sidebar-hover-bg: #34495e;
    --sidebar-text: #ecf0f1;
    --sidebar-text-hover: #ffffff;
    --sidebar-border: #34495e;
    --sidebar-transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --sidebar-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    --sidebar-zindex: 1000;
}

/* =============================================================================
   BASE SIDEBAR CONTAINER
   ============================================================================= */

.sidebar-navigation {
    position: relative;
    z-index: var(--sidebar-zindex);
}

/* Sidebar Container */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    transition: var(--sidebar-transition);
    box-shadow: var(--sidebar-shadow);
    z-index: var(--sidebar-zindex);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Collapsed State */
.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* Mobile Hidden State */
.sidebar.mobile-hidden {
    transform: translateX(-100%);
}

/* =============================================================================
   SIDEBAR HEADER
   ============================================================================= */

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70px;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--sidebar-text);
    transition: var(--sidebar-transition);
}

.sidebar-brand:hover {
    color: var(--sidebar-text-hover);
    text-decoration: none;
}

.sidebar-brand-icon {
    font-size: 1.5rem;
    margin-right: 0.75rem;
    transition: var(--sidebar-transition);
}

.sidebar-brand-text {
    font-size: 1.25rem;
    font-weight: 600;
    transition: var(--sidebar-transition);
    white-space: nowrap;
    opacity: 1;
}

/* Collapsed brand text */
.sidebar.collapsed .sidebar-brand {
    opacity: 0;
    width: 0;
    margin: 0;
    overflow: hidden;
}

/* Toggle Button */
.sidebar-toggle-btn {
    background: none;
    border: none;
    color: var(--sidebar-text);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: var(--sidebar-transition);
}

.sidebar-toggle-btn:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
}

/* =============================================================================
   SIDEBAR MENU
   ============================================================================= */

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-menu::-webkit-scrollbar {
    width: 4px;
}

.sidebar-menu::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-menu::-webkit-scrollbar-thumb {
    background: var(--sidebar-border);
    border-radius: 2px;
}

/* Menu Items */
.sidebar-menu-item {
    position: relative;
}

.sidebar-menu-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--sidebar-transition);
    border-left: 3px solid transparent;
    position: relative;
}

.sidebar-menu-link:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
    text-decoration: none;
    border-left-color: #3498db;
}

.sidebar-menu-link.active {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
    border-left-color: #3498db;
}

.sidebar-menu-icon {
    width: 20px;
    text-align: center;
    margin-right: 0.75rem;
    font-size: 1.1rem;
    transition: var(--sidebar-transition);
}

.sidebar-menu-text {
    flex: 1;
    transition: var(--sidebar-transition);
    white-space: nowrap;
    opacity: 1;
}

.sidebar-menu-arrow {
    margin-left: auto;
    transition: var(--sidebar-transition);
    font-size: 0.8rem;
}

/* Collapsed menu text */
.sidebar.collapsed .sidebar-menu-text,
.sidebar.collapsed .sidebar-menu-arrow {
    opacity: 0;
    width: 0;
    margin: 0;
    overflow: hidden;
}

/* =============================================================================
   SUBMENU STYLES
   ============================================================================= */

.sidebar-submenu {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: var(--sidebar-transition);
    background: rgba(0, 0, 0, 0.1);
}

.sidebar-has-submenu.open .sidebar-submenu {
    max-height: 300px;
}

.sidebar-has-submenu.open .sidebar-menu-arrow {
    transform: rotate(180deg);
}

.sidebar-submenu-item {
    position: relative;
}

.sidebar-submenu-link {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem 0.5rem 3rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--sidebar-transition);
    border-left: 6px solid transparent;
    font-size: 0.9rem;
}

.sidebar-submenu-link:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
    text-decoration: none;
    border-left-color: #3498db;
}

.sidebar-submenu-link.active {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
    border-left-color: #3498db;
}

.sidebar-submenu-icon {
    width: 16px;
    text-align: center;
    margin-right: 0.5rem;
    font-size: 0.9rem;
}

.sidebar-submenu-text {
    transition: var(--sidebar-transition);
    white-space: nowrap;
}

/* Hide submenu in collapsed state */
.sidebar.collapsed .sidebar-submenu {
    display: none;
}

/* =============================================================================
   SIDEBAR FOOTER
   ============================================================================= */

.sidebar-footer {
    border-top: 1px solid var(--sidebar-border);
    padding: 0.5rem 0;
}

.sidebar-user,
.sidebar-logout,
.sidebar-auth {
    padding: 0.25rem 0;
}

.sidebar-user-link,
.sidebar-logout-link,
.sidebar-auth-link {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--sidebar-transition);
    font-size: 0.9rem;
}

.sidebar-user-link:hover,
.sidebar-logout-link:hover,
.sidebar-auth-link:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
    text-decoration: none;
}

.sidebar-user-icon,
.sidebar-logout-icon,
.sidebar-auth-icon {
    width: 20px;
    text-align: center;
    margin-right: 0.75rem;
    font-size: 1rem;
}

.sidebar-user-text,
.sidebar-logout-text,
.sidebar-auth-text {
    transition: var(--sidebar-transition);
    white-space: nowrap;
    opacity: 1;
}

/* Collapsed footer text */
.sidebar.collapsed .sidebar-user-text,
.sidebar.collapsed .sidebar-logout-text,
.sidebar.collapsed .sidebar-auth-text {
    opacity: 0;
    width: 0;
    margin: 0;
    overflow: hidden;
}

/* =============================================================================
   OVERLAY AND MOBILE STYLES
   ============================================================================= */

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--sidebar-zindex) - 1;
    opacity: 0;
    visibility: hidden;
    transition: var(--sidebar-transition);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Toggle Button */
.mobile-sidebar-toggle {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: var(--sidebar-zindex) + 1;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--sidebar-shadow);
    transition: var(--sidebar-transition);
    display: none;
}

.mobile-sidebar-toggle:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-hover);
}

/* =============================================================================
   TOOLTIP STYLES (for collapsed sidebar)
   ============================================================================= */

.sidebar-menu-link[title]:hover::after,
.sidebar-user-link[title]:hover::after,
.sidebar-logout-link[title]:hover::after,
.sidebar-auth-link[title]:hover::after {
    content: attr(title);
    position: absolute;
    left: calc(100% + 0.5rem);
    top: 50%;
    transform: translateY(-50%);
    background: #2c3e50;
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    white-space: nowrap;
    z-index: 1001;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Only show tooltips in collapsed state */
.sidebar:not(.collapsed) .sidebar-menu-link[title]:hover::after,
.sidebar:not(.collapsed) .sidebar-user-link[title]:hover::after,
.sidebar:not(.collapsed) .sidebar-logout-link[title]:hover::after,
.sidebar:not(.collapsed) .sidebar-auth-link[title]:hover::after {
    display: none;
}

/* =============================================================================
   RESPONSIVE BREAKPOINTS
   ============================================================================= */

/* Tablet and Desktop */
@media (min-width: 768px) {
    
    .sidebar-overlay {
        display: none;
    }
}

/* Mobile */
@media (max-width: 767.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .sidebar-toggle-btn {
        display: none;
    }
}

/* Large Desktop */
@media (min-width: 1200px) {
    :root {
        --sidebar-width: 320px;
    }
}

/* =============================================================================
   MAIN CONTENT ADJUSTMENT
   ============================================================================= */

/* Adjust main content for sidebar */
@media (min-width: 768px) {
    .main-content {
        width: calc(100% - var(--sidebar-width));
        margin-left: var(--sidebar-width);
        transition: var(--sidebar-transition);
    }
    
    .sidebar.collapsed + .main-content,
    .main-content.sidebar-collapsed {
        width: calc(100% - 40px);
        margin-left: var(--sidebar-collapsed-width);
    }
}

/* =============================================================================
   ANIMATIONS AND EFFECTS
   ============================================================================= */

/* Pulse effect for active items */
@keyframes pulse-border {
    0% {
        border-left-color: #3498db;
    }
    50% {
        border-left-color: #5dade2;
    }
    100% {
        border-left-color: #3498db;
    }
}

.sidebar-menu-link.active {
    animation: pulse-border 2s ease-in-out infinite;
}

/* Smooth icon transitions */
.sidebar-menu-icon,
.sidebar-brand-icon {
    transform-origin: center;
}

.sidebar-menu-link:hover .sidebar-menu-icon {
    transform: scale(1.1);
}

/* Loading states */
.sidebar.loading {
    opacity: 0.7;
    pointer-events: none;
}

.sidebar.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2rem;
    height: 2rem;
    border: 3px solid transparent;
    border-top: 3px solid var(--sidebar-text);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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