/* Sidebar Styles */
:root {
    --sidebar-width: 260px;
    --sidebar-bg: #1A237E;
    --sidebar-text: #ffffff;
    --sidebar-hover: #304FFE;
    /* Lighter blue */
    --sidebar-active: #3949AB;
    /* Medium blue */
    --header-height: 64px;
}

/* Main Layout Wrapper */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Container */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    overflow-y: auto;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    height: var(--header-height);
}

.sidebar-logo {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    margin-right: 12px;
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: bold;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Navigation Links */
.sidebar-nav {
    padding: 1rem 0;
    flex: 1;
}

.nav-item {
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    font-weight: 500;
}

.nav-link:hover {
    background-color: var(--sidebar-hover);
    color: white;
}

.nav-link.active {
    background-color: var(--sidebar-active);
    color: white;
    border-left: 4px solid #FFC107;
    /* Amber accent */
}

.nav-icon {
    margin-right: 12px;
    width: 20px;
    height: 20px;
}

/* Accordion Styles */
.nav-group-header {
    justify-content: space-between;
}

.dropdown-icon {
    transition: transform 0.3s ease;
}

.nav-item.expanded .dropdown-icon {
    transform: rotate(180deg);
}

.nav-sub-group {
    background-color: rgba(0, 0, 0, 0.2);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.nav-item.expanded .nav-sub-group {
    max-height: 500px;
    /* Arbitrary large height */
    transition: max-height 0.5s ease-in;
}

.sub-nav-link {
    padding: 10px 24px 10px 56px;
    /* Indented */
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    display: block;
}

.sub-nav-link:hover {
    color: white;
    background-color: rgba(255, 255, 255, 0.05);
}

.sub-nav-link.active {
    color: #FFC107;
}

/* Main Content Adjustment */
.main-content-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    width: calc(100% - var(--sidebar-width));
    transition: margin-left 0.3s ease, width 0.3s ease;
}


/* Collapsed Sidebar */
.sidebar.collapsed {
    width: 80px;
}

.sidebar.collapsed .sidebar-title-text,
.sidebar.collapsed .nav-text,
.sidebar.collapsed .dropdown-icon {
    display: none;
}

.sidebar.collapsed .nav-link {
    justify-content: center;
    padding: 12px;
}

.sidebar.collapsed .nav-icon {
    margin-right: 0;
}

.sidebar.collapsed .nav-group-header {
    justify-content: center;
}

.sidebar.collapsed .nav-sub-group {
    display: none;
    /* Hide sub-menus when collapsed */
}

/* Main Content Adjustment for Collapsed Sidebar */
.main-content-wrapper.expanded {
    margin-left: 80px;
    width: calc(100% - 80px);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 10px rgba(0, 0, 0, 0.3);
    }

    .main-content-wrapper {
        margin-left: 0;
        width: 100%;
    }

    .main-content-wrapper.expanded {
        margin-left: 0;
        width: 100%;
    }

    /* Mobile Overlay */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .sidebar-overlay.active {
        display: block;
    }
}