:root {
    /* Layout Sizes */
    --navbar-height: 70px;
    --sidebar-width: 240px;
    --sidebar-collapsed-width: 75px;
    --transition-speed: 0.25s;
    /* Primary Medical Blue */
    --brand-blue: #0d6efd;
    --brand-blue-dark: #0a58ca;
    /* Light Mode Sidebar Variables */
    --sidebar-bg: var(--brand-blue);
    --sidebar-text: rgba(255, 255, 255, 0.9);
    --sidebar-hover-bg: rgba(255, 255, 255, 0.12);
    --sidebar-active-bg: rgba(255, 255, 255, 0.22);
}

/* Bootstrap 5.3 Dark Mode Overrides */
[data-bs-theme="dark"] {
    --sidebar-bg: #1a1d20;
    --sidebar-text: #e9ecef;
    --sidebar-hover-bg: rgba(13, 110, 253, 0.2);
    --sidebar-active-bg: rgba(13, 110, 253, 0.35);
    --bs-table-striped-bg: rgba(255, 255, 255, 0.02);
}

/* 1. STICKY FOOTER CORE LAYOUT */
html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
}

/* The wrapper containing Sidebar + Main Content */
.main-wrapper {
    display: flex;
    flex: 1 0 auto; /* Pushes footer down */
    margin-top: var(--navbar-height);
}

/* Top Navigation */
.top-nav {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--navbar-height);
    background-color: var(--brand-blue);
    z-index: 1030;
    display: flex;
    align-items: center;
}

[data-bs-theme="dark"] .top-nav {
    background-color: var(--bs-body-bg);
    border-bottom: 1px solid var(--bs-border-color);
}

/* Sidebar Core */
#sidebar {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--navbar-height));
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    transition: width var(--transition-speed) ease, transform var(--transition-speed) ease;
    overflow-y: auto;
    z-index: 1020;
}

    /* Sidebar Links */
    #sidebar .nav-link, .offcanvas .nav-link {
        color: inherit;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding: 0.8rem 1.25rem;
        transition: all 0.15s ease-in-out;
        border-left: 4px solid transparent;
    }

        #sidebar .nav-link:hover {
            background-color: var(--sidebar-hover-bg);
            color: #fff;
        }

        #sidebar .nav-link.active {
            background-color: var(--sidebar-active-bg);
            color: #fff !important;
            font-weight: 600;
            border-left-color: #fff;
        }

/* Collapsed Sidebar Logic */
.sidebar-collapsed #sidebar {
    width: var(--sidebar-collapsed-width);
}

    .sidebar-collapsed #sidebar .menu-text,
    .sidebar-collapsed .sidebar-section-title,
    .sidebar-collapsed #sidebar .bi-chevron-down {
        display: none;
    }

    .sidebar-collapsed #sidebar .nav-link {
        justify-content: center;
        padding: 0.8rem 0;
        border-left: none;
    }

/* Content Area */
.content-area {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 1.5rem;
    background-color: var(--bs-body-tertiary);
    transition: margin-left var(--transition-speed) ease;
}

.sidebar-collapsed .content-area {
    margin-left: var(--sidebar-collapsed-width);
}

/* Footer Styling */
.hms-footer {
    flex-shrink: 0;
    background-color: var(--brand-blue);
    color: #ffffff;
    padding: 1rem 0;
    z-index: 1040;
}

[data-bs-theme="dark"] .hms-footer {
    background-color: var(--bs-body-bg);
    border-top: 1px solid var(--bs-border-color) !important;
    color: var(--bs-body-color);
}

/* Mobile Adjustments */
@media (max-width: 991px) {
    #sidebar {
        transform: translateX(-100%);
    }

        #sidebar.show-mobile {
            transform: translateX(0);
        }

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

/* Utilities */
[data-bs-theme="light"] .d-none-light {
    display: none !important;
}

[data-bs-theme="dark"] .d-none-dark {
    display: none !important;
}

.tracking-wider {
    letter-spacing: 0.05rem;
}

.extra-small {
    font-size: 0.75rem;
}

/* Components */
#backToTop {
    transition: transform 0.2s, opacity 0.3s;
    border: 2px solid rgba(255,255,255,0.2);
    z-index: 1050;
}

    #backToTop:hover {
        transform: translateY(-5px);
        background-color: var(--brand-blue-dark);
    }

[data-bs-theme="dark"] .table-warning-subtle {
    background-color: rgba(255, 193, 7, 0.1) !important;
    color: #ffc107 !important;
}

/* Print Overrides */
@media print {
    .top-nav, #sidebar, #backToTop, .navbar, .btn, .dropdown, #categoryFilter, #inventorySearch, .btn-group {
        display: none !important;
    }

    .content-area {
        margin: 0 !important;
        padding: 0 !important;
        width: 100% !important;
        background: #fff !important;
    }

    table {
        font-size: 10pt;
        width: 100%;
        border: 1px solid #ddd;
    }
}

canvas#dispensedSparkline {
    filter: drop-shadow(0px 2px 2px rgba(0, 0, 0, 0.1));
}

[data-bs-theme="dark"] canvas#dispensedSparkline {
    filter: drop-shadow(0px 2px 4px rgba(25, 135, 84, 0.4));
}

.tooltip-inner {
    background-color: var(--brand-blue-dark);
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
}

.bs-tooltip-auto[data-popper-placement^=top] .tooltip-arrow::before {
    border-top-color: var(--brand-blue-dark);
}