/*
 * Modern Sidebar Design - Chess Kingdom Education Management
 * 
 * Clean, modern sidebar with premium look
 * - Light background with subtle gradients
 * - Smooth hover animations
 * - Clean icons with consistent styling
 * - Blue accent color (#3b82f6)
 */

/* ================================================
   CSS VARIABLES
   ================================================ */
:root {
    /* Sidebar Colors */
    --sb-bg: #ffffff;
    --sb-border: #e5e7eb;
    --sb-text: #374151;
    --sb-text-muted: #6b7280;
    --sb-icon: #9ca3af;

    /* Hover & Active States */
    --sb-hover-bg: #f3f4f6;
    --sb-active-bg: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    --sb-active-border: #3b82f6;
    --sb-active-text: #1d4ed8;
    --sb-active-icon: #3b82f6;

    /* Profile Area */
    --sb-profile-bg: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);

    /* Dimensions */
    --sb-width: 250px;
    --sb-collapsed-width: 72px;
    --sb-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================================
   SIDEBAR CONTAINER
   ================================================ */
.sidebar-left,
#sidebar-left,
aside.sidebar-left {
    background: var(--sb-bg) !important;
    border-right: 1px solid var(--sb-border) !important;
    width: var(--sb-width) !important;
    min-width: var(--sb-width) !important;
    transition: width var(--sb-transition), min-width var(--sb-transition) !important;
    box-shadow: 4px 0 15px rgba(0, 0, 0, 0.03) !important;
    z-index: 100;
    position: relative;
    overflow: visible !important;
}

/* Scrollbar styling */
.sidebar-left .nano,
.sidebar-left .nano-content {
    background: transparent !important;
}

.sidebar-left .nano-pane {
    background: transparent !important;
    width: 6px !important;
    right: 2px !important;
}

.sidebar-left .nano-slider {
    background: var(--sb-border) !important;
    border-radius: 3px !important;
    width: 4px !important;
}

/* ================================================
   TOGGLE BUTTON (MODERN PILL STYLE)
   ================================================ */
.sidebar-toggle-btn {
    position: absolute !important;
    right: -16px !important;
    top: 80px !important;
    width: 32px !important;
    height: 32px !important;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%) !important;
    border: 1px solid var(--sb-border) !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    z-index: 1001 !important;
    transition: all 0.2s ease !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06) !important;
}

.sidebar-toggle-btn:hover {
    background: var(--sb-active-border) !important;
    border-color: var(--sb-active-border) !important;
    transform: scale(1.1) !important;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3) !important;
}

.sidebar-toggle-btn i {
    font-size: 11px !important;
    color: var(--sb-text-muted) !important;
    transition: all 0.2s ease !important;
}

.sidebar-toggle-btn:hover i {
    color: #ffffff !important;
}

/* Arrow direction */
html:not(.sidebar-collapsed) .sidebar-toggle-btn .fa-chevron-right {
    display: none !important;
}

html:not(.sidebar-collapsed) .sidebar-toggle-btn .fa-chevron-left {
    display: inline-block !important;
}

html.sidebar-collapsed .sidebar-toggle-btn .fa-chevron-left {
    display: none !important;
}

html.sidebar-collapsed .sidebar-toggle-btn .fa-chevron-right {
    display: inline-block !important;
}

/* ================================================
   USER PROFILE AREA
   ================================================ */
.sidebar-left .widget-profile-info,
.sidebar-left .sidebar-widget-profile,
.sidebar-left .widget-profile {
    background: var(--sb-profile-bg) !important;
    border-bottom: 1px solid var(--sb-border) !important;
    padding: 20px 16px !important;
    margin: 0 !important;
}

.sidebar-left .profile-picture,
.sidebar-left .widget-profile .profile-picture {
    width: 48px !important;
    height: 48px !important;
    border-radius: 12px !important;
    overflow: hidden !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important;
    border: 2px solid #ffffff !important;
}

.sidebar-left .profile-picture img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover !important;
}

.sidebar-left .profile-info {
    margin-left: 12px !important;
}

.sidebar-left .profile-info .name,
.sidebar-left .profile-info span:first-child {
    color: var(--sb-text) !important;
    font-weight: 600 !important;
    font-size: 14px !important;
    display: block !important;
    line-height: 1.3 !important;
}

.sidebar-left .profile-info .role,
.sidebar-left .profile-info small,
.sidebar-left .profile-info span:last-child {
    color: var(--sb-text-muted) !important;
    font-size: 12px !important;
    display: block !important;
    margin-top: 2px !important;
}

/* ================================================
   NAVIGATION MENU
   ================================================ */
.nav-main {
    padding: 12px 8px !important;
}

.nav-main>li {
    margin-bottom: 2px !important;
}

.nav-main>li>a,
.nav-main li a {
    display: flex !important;
    align-items: center !important;
    padding: 11px 14px !important;
    margin: 0 !important;
    color: var(--sb-text) !important;
    font-size: 13.5px !important;
    font-weight: 500 !important;
    text-decoration: none !important;
    border-radius: 10px !important;
    border-left: none !important;
    transition: all 0.15s ease !important;
    gap: 12px !important;
    position: relative !important;
    background: transparent !important;
}

/* Hover State */
.nav-main>li>a:hover,
.nav-main li a:hover {
    background: var(--sb-hover-bg) !important;
    color: var(--sb-text) !important;
}

/* Current item only */
.nav-main>li.current>a,
.nav-main .nav-children>li.current>a {
    background: var(--sb-active-bg) !important;
    color: var(--sb-active-text) !important;
    font-weight: 600 !important;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15) !important;
}

/* Active indicator bar */
.nav-main>li.current>a::before {
    content: '' !important;
    position: absolute !important;
    left: 0 !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 4px !important;
    height: 60% !important;
    background: var(--sb-active-border) !important;
    border-radius: 0 4px 4px 0 !important;
}

/* Expanded parent state */
.nav-main>li.nav-expanded>a,
.nav-main .nav-children>li.nav-parent.nav-expanded>a {
    background: var(--sb-hover-bg) !important;
    color: var(--sb-text) !important;
    box-shadow: none !important;
}

/* ================================================
   MENU ICONS
   ================================================ */
.nav-main li a i,
.nav-main li a .fa,
.nav-main li a .fas,
.nav-main li a .far,
.nav-main li a .fab {
    width: 22px !important;
    height: 22px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 15px !important;
    color: var(--sb-icon) !important;
    flex-shrink: 0 !important;
    transition: all 0.15s ease !important;
}

/* Icon hover */
.nav-main li a:hover i,
.nav-main li a:hover .fa,
.nav-main li a:hover .fas {
    color: var(--sb-text) !important;
}

/* Icon active */
.nav-main>li.current>a i,
.nav-main>li.current>a .fa,
.nav-main .nav-children>li.current>a i,
.nav-main .nav-children>li.current>a .fa {
    color: var(--sb-active-icon) !important;
}

/* Expanded parents stay neutral */
.nav-main>li.nav-expanded>a i,
.nav-main>li.nav-expanded>a .fa,
.nav-main .nav-children>li.nav-parent.nav-expanded>a i,
.nav-main .nav-children>li.nav-parent.nav-expanded>a .fa {
    color: var(--sb-icon) !important;
}

/* ================================================
   MENU TEXT
   ================================================ */
.nav-main li a span {
    flex: 1 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    transition: opacity 0.2s ease !important;
}

/* ================================================
   PARENT MENU ARROW
   ================================================ */
.nav-main li.nav-parent>a::after {
    display: none !important;
    content: none !important;
}

/* ================================================
   SUBMENU (CHILDREN)
   ================================================ */
.nav-main .nav-children,
.nav-main ul.nav-children {
    background: transparent !important;
    padding: 4px 0 4px 20px !important;
    margin: 0 !important;
    border-left: none !important;
    list-style: none !important;
}

.nav-main .nav-children>li {
    margin-bottom: 1px !important;
}

.nav-main .nav-children .submenu-header {
    display: none !important;
}

.nav-main .nav-children .submenu-items {
    padding: 0 !important;
    margin: 0 !important;
}

.nav-main .nav-children>li>a,
.nav-main .nav-children .submenu-items>li>a {
    padding: 9px 12px 9px 24px !important;
    font-size: 13px !important;
    font-weight: 400 !important;
    color: var(--sb-text-muted) !important;
    border-radius: 8px !important;
    position: relative !important;
}

/* Submenu dot indicator */
.nav-main .nav-children>li>a::before,
.nav-main .nav-children .submenu-items>li>a::before {
    content: '' !important;
    position: absolute !important;
    left: 10px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 5px !important;
    height: 5px !important;
    background: var(--sb-border) !important;
    border-radius: 50% !important;
    transition: all 0.15s ease !important;
}

.nav-main .nav-children>li.nav-parent>a::before,
.nav-main .nav-children .submenu-items>li.nav-parent>a::before {
    display: none !important;
}

.nav-main .nav-children>li>a:hover,
.nav-main .nav-children .submenu-items>li>a:hover {
    background: var(--sb-hover-bg) !important;
    color: var(--sb-text) !important;
}

.nav-main .nav-children>li>a:hover::before,
.nav-main .nav-children .submenu-items>li>a:hover::before {
    background: var(--sb-text) !important;
}

.nav-main .nav-children>li.current>a,
.nav-main .nav-children .submenu-items>li.current>a {
    background: rgba(59, 130, 246, 0.08) !important;
    color: var(--sb-active-text) !important;
    font-weight: 600 !important;
}

.nav-main .nav-children>li.current>a::before,
.nav-main .nav-children .submenu-items>li.current>a::before {
    background: var(--sb-active-icon) !important;
    width: 6px !important;
    height: 6px !important;
}

/* ================================================
   COLLAPSED STATE
   ================================================ */
html.sidebar-collapsed .sidebar-left,
html.sidebar-collapsed #sidebar-left {
    width: var(--sb-collapsed-width) !important;
    min-width: var(--sb-collapsed-width) !important;
}

html.sidebar-collapsed .content-body {
    margin-left: var(--sb-collapsed-width) !important;
}

/* Profile collapsed */
html.sidebar-collapsed .sidebar-left .widget-profile-info,
html.sidebar-collapsed .sidebar-left .widget-profile {
    padding: 16px 8px !important;
    justify-content: center !important;
}

html.sidebar-collapsed .sidebar-left .profile-info {
    display: none !important;
}

html.sidebar-collapsed .sidebar-left .profile-picture {
    margin: 0 auto !important;
}

/* Menu collapsed */
html.sidebar-collapsed .nav-main {
    padding: 12px 6px !important;
}

html.sidebar-collapsed .nav-main>li>a {
    justify-content: center !important;
    padding: 12px 8px !important;
    border-radius: 10px !important;
}

html.sidebar-collapsed .nav-main li a span {
    display: none !important;
}

html.sidebar-collapsed .nav-main li a i {
    margin: 0 !important;
    font-size: 18px !important;
    width: auto !important;
}

html.sidebar-collapsed .nav-main li.nav-parent>a::after {
    display: none !important;
}

html.sidebar-collapsed .nav-main>li.current>a::before {
    left: 0 !important;
    width: 3px !important;
    height: 50% !important;
    border-radius: 0 3px 3px 0 !important;
}

/* Hide submenu when collapsed */
html.sidebar-collapsed .nav-main .nav-children {
    display: none !important;
}

/* Tooltip on hover (collapsed) */
html.sidebar-collapsed .nav-main>li {
    position: relative !important;
}

html.sidebar-collapsed .nav-main>li>a[data-title]::after {
    content: attr(data-title) !important;
    position: absolute !important;
    left: calc(100% + 12px) !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    background: #1e293b !important;
    color: #ffffff !important;
    padding: 8px 14px !important;
    border-radius: 8px !important;
    font-size: 13px !important;
    font-weight: 500 !important;
    white-space: nowrap !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transition: all 0.15s ease !important;
    z-index: 9999 !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
    pointer-events: none !important;
}

html.sidebar-collapsed .nav-main>li>a[data-title]:hover::after {
    opacity: 1 !important;
    visibility: visible !important;
}

/* ================================================
   CONTENT BODY ADJUSTMENT
   ================================================ */
.content-body {
    margin-left: var(--sb-width) !important;
    transition: margin-left var(--sb-transition) !important;
}

/* ================================================
   SECTION TITLES (if any)
   ================================================ */
.nav-main .nav-title,
.nav-main .menu-title,
.nav-main>li.nav-title {
    padding: 16px 14px 8px !important;
    font-size: 10px !important;
    font-weight: 700 !important;
    text-transform: uppercase !important;
    letter-spacing: 0.8px !important;
    color: var(--sb-text-muted) !important;
    pointer-events: none !important;
}

html.sidebar-collapsed .nav-main .nav-title,
html.sidebar-collapsed .nav-main .menu-title {
    display: none !important;
}

/* ================================================
   RESPONSIVE
   ================================================ */
@media (max-width: 991px) {

    .sidebar-left,
    #sidebar-left {
        position: fixed !important;
        left: 0 !important;
        top: 0 !important;
        height: 100vh !important;
        transform: translateX(-100%) !important;
        z-index: 1050 !important;
    }

    html.sidebar-open .sidebar-left,
    html.sidebar-open #sidebar-left {
        transform: translateX(0) !important;
    }

    .content-body {
        margin-left: 0 !important;
    }

    .sidebar-toggle-btn {
        display: none !important;
    }
}

/* ================================================
   ANIMATION POLISH
   ================================================ */
.nav-main>li {
    opacity: 0;
    animation: menuFadeIn 0.3s ease forwards;
}

.nav-main>li:nth-child(1) {
    animation-delay: 0.02s;
}

.nav-main>li:nth-child(2) {
    animation-delay: 0.04s;
}

.nav-main>li:nth-child(3) {
    animation-delay: 0.06s;
}

.nav-main>li:nth-child(4) {
    animation-delay: 0.08s;
}

.nav-main>li:nth-child(5) {
    animation-delay: 0.10s;
}

.nav-main>li:nth-child(6) {
    animation-delay: 0.12s;
}

.nav-main>li:nth-child(7) {
    animation-delay: 0.14s;
}

.nav-main>li:nth-child(8) {
    animation-delay: 0.16s;
}

.nav-main>li:nth-child(9) {
    animation-delay: 0.18s;
}

.nav-main>li:nth-child(10) {
    animation-delay: 0.20s;
}

.nav-main>li:nth-child(11) {
    animation-delay: 0.22s;
}

.nav-main>li:nth-child(12) {
    animation-delay: 0.24s;
}

@keyframes menuFadeIn {
    from {
        opacity: 0;
        transform: translateX(-8px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Hover ripple effect */
.nav-main>li>a {
    overflow: hidden !important;
}

.nav-main>li>a:active {
    transform: scale(0.98) !important;
}