:root {
    --sidebar-width: 280px;

    /* Light theme variables */
    --bg-primary: #7ece25;
    --bg-secondary: #ff00fd;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --card-bg: #ffffff;
    --navbar-bg: #ffffff;
    --table-bg: #ffffff;
    --table-hover: #f5f5f5;
}

/* Layout Container */
.layout-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 60px 1fr 80px;
    grid-template-areas:
    "logo header"
    "nav main"
    "footer main";
    height: 100vh;
    overflow: hidden;
}

/* 1. Logo Area (Fixed) */
.logo-area {
    grid-area: logo;
    background-color: #1a1a1a;
    /* border-right: 2px solid #e91e63; */
    position: relative;
    z-index: 1000;
}

/* 4. Header Menu (Fixed) */
.header-menu {
    grid-area: header;
    background-color: #cfcfcf;
    position: relative;
    z-index: 999;
}

.header-icon {
    width: 20px;
    height: 20px;
    background-color: #000;
}

/* 2. Navigation Area (Scrollable only in this area) */

.navigation-area {
    grid-area: nav;
    background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 100%);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;

    width: var(--sidebar-width);
    z-index: 1000;
}

/* Scrollbereiche */
.nav-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.nav-scroll-area {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

/* Scrollbar Optik */
.nav-scroll-area::-webkit-scrollbar {
    width: 8px;
}
.nav-scroll-area::-webkit-scrollbar-track {
    background: #495057;
}
.nav-scroll-area::-webkit-scrollbar-thumb {
    background: #3a3a3a;
    border-radius: 4px;
}
.nav-scroll-area::-webkit-scrollbar-thumb:hover {
    background: #3a3a3a;
}

/* Sidebar-Optik */
.nav-link {
    display: block;
    width: 100%;
    border-radius: 0;
    padding: 12px 20px;
    color: #ecf0f1;
    background-color: transparent;
    border-left: 4px solid transparent;
}
.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-left-color: #3498db;
    color: #fff;
}
.nav-link.active {
    background-color: #2a2a2a;
    border-left: 4px solid #0d6efd;
    color: #fff;
}



/* 5. Main Window (Scrollable only in this area) */
.main-window {
    grid-area: main;
    background-color: #f8f9fa;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.main-header {
    flex-shrink: 0;
}

.main-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.main-scroll-area {
    flex: 1;
    overflow-y: auto;
}

.main-scroll-area::-webkit-scrollbar {
    width: 8px;
}

.main-scroll-area::-webkit-scrollbar-track {
    background: #e9ecef;
}

.main-scroll-area::-webkit-scrollbar-thumb {
    background: #3a3a3a;
    border-radius: 4px;
}

.main-scroll-area::-webkit-scrollbar-thumb:hover {
    background: #3a3a3a;
}

/* 3. Footer (Fixed, 3 lines high) */
.footer-area {
    grid-area: footer;
    background: linear-gradient(180deg, #2d2d2d 0%, #1a1a1a 100%);
    position: relative;
    z-index: 998;
}

.footer-area .footer-text {
    font-size: 0.75rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .layout-container {
        grid-template-columns: 150px 1fr;
    }
}

@media (max-width: 576px) {
    .layout-container {
        grid-template-columns: 120px 1fr;
        grid-template-rows: 50px 1fr 70px;
    }

    .logo-area,
    .header-menu {
        font-size: 0.8rem;
    }

    .footer-area {
        font-size: 0.7rem;
    }
}

/* Body Styling */
body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    overflow: hidden;
}

/* Navigation Links */
.nav-link {
    padding: 0.5rem 0.3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #e91e63 !important;
}

/* Cards in Main Content */
.card {
    border: 1px solid #e91e63;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(233, 30, 99, 0.2);
}

.header-menu.navbar-dark {
    --bs-navbar-color: #222;
    --bs-navbar-hover-color: #000;
    --bs-navbar-active-color: #000;
    --bs-navbar-brand-color: #222;
    --bs-navbar-brand-hover-color: #000;
}

.breadcrumb-nav a {
    color: #222;
    text-decoration: none;
    transition: none;
}

.breadcrumb-nav a:hover,
.breadcrumb-nav a:focus,
.breadcrumb-nav a:active {
    color: #222;
    text-decoration: none;
}

.breadcrumb-nav {
    font-weight: 500;
    font-size: 0.95rem;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.overlay.show {
    opacity: 1;
    visibility: visible;
}

.navbar-toggler {
    border: none;
    padding: 4px 8px;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar {
    background-color: var(--navbar-bg) !important;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.navbar-text {
    color: var(--text-primary);
}

.card {
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.stats-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
}

.stats-card.success {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.stats-card.warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stats-card.info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.table {
    background-color: var(--table-bg);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.table-hover tbody tr:hover {
    background-color: var(--table-hover);
}

.breadcrumb {
    background: none;
    padding: 0;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: ">";
    color: var(--text-secondary);
}

.breadcrumb-item a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.breadcrumb-item.active {
    color: var(--text-primary);
}

.dropdown-menu {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.dropdown-item {
    color: var(--text-primary);
    transition: color 0.3s ease, background-color 0.3s ease;
}

.dropdown-item:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* Tabs Styling */
.nav-tabs {
    border-bottom: 2px solid var(--border-color);
}

.nav-tabs .nav-link {
    border: 1px solid transparent;
    color: var(--text-secondary);
    background-color: transparent;
    transition: all 0.3s ease;
    margin-bottom: -2px;
}

.nav-tabs .nav-link:hover {
    border-color: var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.nav-tabs .nav-link.active {
    color: #0d6efd;
    background-color: var(--card-bg);
    border-color: var(--border-color) var(--border-color) var(--card-bg);
    border-bottom-color: var(--card-bg);
}

.tab-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-top: none;
    padding: 20px;
    border-radius: 0 0 8px 8px;
}

/* Vertical Tabs */
.vertical-tabs {
    display: flex;
    gap: 0;
}

.vertical-tabs .nav-tabs {
    flex-direction: column;
    border-bottom: none;
    border-right: 2px solid var(--border-color);
    min-width: 200px;
}

.vertical-tabs .nav-tabs .nav-link {
    text-align: left;
    border-radius: 8px 0 0 8px;
    margin-bottom: 4px;
    margin-right: -2px;
}

.vertical-tabs .nav-tabs .nav-link.active {
    border-color: var(--border-color) var(--card-bg) var(--border-color) var(--border-color);
    border-right-color: var(--card-bg);
}

.vertical-tabs .tab-content {
    flex: 1;
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 8px 8px 0;
}

/* Accordion Styling */
.accordion {
    --bs-accordion-bg: var(--card-bg);
    --bs-accordion-border-color: var(--border-color);
    --bs-accordion-btn-color: var(--text-primary);
    --bs-accordion-btn-bg: var(--card-bg);
    --bs-accordion-btn-focus-border-color: #86b7fe;
    --bs-accordion-btn-focus-box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
    --bs-accordion-body-color: var(--text-primary);
    --bs-accordion-active-color: var(--text-primary);
    --bs-accordion-active-bg: var(--bg-secondary);
}

.accordion-button:not(.collapsed) {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.accordion-button::after {
    filter: var(--bs-accordion-btn-icon-filter, invert(0));
}

[data-theme="dark"] .accordion-button::after {
    filter: invert(1);
}

.accordion-item {
    margin-bottom: 8px;
    border-radius: 8px;
    overflow: hidden;
}

.accordion-button {
    border-radius: 8px;
    transition: all 0.3s ease;
}

.accordion-button:not(.collapsed) {
    border-radius: 8px 8px 0 0;
}

@media (min-width: 992px) {
    .sidebar {
        position: fixed;
        transform: translateX(0);
    }
    .navbar-toggler {
        display: none;
    }
}