:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #64748b;
    --bg-color: #f1f5f9;
    --sidebar-bg: #1e293b;
    --sidebar-text: #e2e8f0;
    --sidebar-hover: #334155;
    --card-bg: #ffffff;
    --text-color: #334155;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --transition-speed: 0.3s;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-speed);
    position: fixed;
    height: 100vh;
    z-index: 1000;
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--sidebar-hover);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.sidebar-nav ul li a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--sidebar-text);
    transition: background-color var(--transition-speed);
    gap: 1rem;
}

.sidebar-nav ul li a:hover,
.sidebar-nav ul li.active a {
    background-color: var(--primary-color);
    color: #fff;
}

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

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    background-color: var(--sidebar-hover);
    border-radius: 0.5rem;
    transition: background-color var(--transition-speed);
    gap: 0.5rem;
}

.logout-btn:hover {
    background-color: var(--danger-color);
    color: #fff;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-speed);
}

.top-bar {
    background-color: var(--card-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.sidebar-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-color);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content-wrapper {
    padding: 2rem;
    flex: 1;
}

/* Dashboard Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-info h3 {
    font-size: 0.875rem;
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

/* Charts */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-container {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chart-container h2 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Tables */
.table-container {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    overflow-x: auto;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    color: var(--secondary-color);
    background-color: #f8fafc;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-color);
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content-wrapper {
    padding: 2rem;
    flex: 1;
}

/* Dashboard Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-info h3 {
    font-size: 0.875rem;
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

/* Charts */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-container {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chart-container h2 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Tables */
.table-container {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    overflow-x: auto;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 15px;
}

th {
    font-weight: 600;
    color: var(--secondary-color);
    background-color: #f8fafc;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-color);
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-family: inherit;
}

/* Sidebar Collapsed State (Desktop) */
.sidebar.collapsed {
    width: 70px;
}

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

.sidebar.collapsed .logo img {
    max-height: 30px;
}

.sidebar.collapsed .sidebar-nav ul li a span,
.sidebar.collapsed .logout-btn span {
    display: none;
}

.sidebar.collapsed .sidebar-nav ul li a {
    justify-content: center;
    padding: 0.75rem;
}

.sidebar.collapsed .logout-btn {
    justify-content: center;
}

/* Main Content Expanded State (Desktop) */
.main-content.expanded {
    margin-left: 70px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        max-width: 300px;
        position: fixed;
        left: 0;
        top: 60px;
        height: auto;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        z-index: 2000;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .sidebar.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-content {
        margin-left: 0;
    }

    /* On mobile, ignore collapsed class */
    .sidebar.collapsed {
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
    }

    .sidebar.collapsed.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
}

/* Enhanced Responsive Design for Tablet and Mobile */

/* Tablet (768px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .content-wrapper {
        padding: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        padding: 0.75rem 1.25rem;
        min-height: 44px;
    }

    .btn-sm {
        padding: 0.5rem 0.75rem;
        min-height: 36px;
    }
}

/* Mobile Enhancements (max-width: 768px) */
@media (max-width: 768px) {
    .content-wrapper {
        padding: 1rem;
    }

    .top-bar {
        padding: 0.75rem 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat-card {
        padding: 1rem;
    }

    .charts-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .chart-container {
        padding: 1rem;
    }

    .table-container {
        padding: 1rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    table {
        min-width: 600px;
        font-size: 14px;
    }

    th,
    td {
        padding: 0.75rem 0.5rem;
        font-size: 14px;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 1rem;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .page-header .actions {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        width: 100%;
    }

    .page-header .actions .btn {
        flex: 1;
        min-width: 120px;
        justify-content: center;
    }

    .btn {
        padding: 0.75rem 1rem;
        min-height: 44px;
        font-size: 14px;
    }

    .btn-sm {
        padding: 0.5rem 0.75rem;
        min-height: 36px;
        font-size: 13px;
    }

    .form-control {
        padding: 0.75rem;
        font-size: 16px;
    }

    .modal-content {
        width: 95%;
        max-width: 95%;
        margin: 1rem;
        max-height: 85vh;
    }

    .card form {
        grid-template-columns: 1fr !important;
    }

    .user-menu {
        gap: 0.5rem;
    }

    .avatar {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
}

/* Small Mobile (max-width: 480px) */
@media (max-width: 480px) {
    .content-wrapper {
        padding: 0.75rem;
    }

    .page-header h1 {
        font-size: 1.25rem;
    }

    .stat-card {
        padding: 0.75rem;
        gap: 1rem;
    }

    .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .stat-info h3 {
        font-size: 0.75rem;
    }

    .stat-info p {
        font-size: 1.25rem;
    }

    table {
        font-size: 13px;
    }

    th,
    td {
        padding: 0.5rem 0.25rem;
        font-size: 13px;
    }

    .page-header .actions {
        flex-direction: column;
    }

    .page-header .actions .btn {
        width: 100%;
    }

    .modal-content {
        padding: 1.5rem;
    }

    .modal-content h2 {
        font-size: 1.25rem;
    }
}

/* Print styles */
@media print {

    .sidebar,
    .top-bar,
    .btn,
    .actions {
        display: none !important;
    }

    .main-content {
        margin-left: 0;
    }

    .content-wrapper {
        padding: 0;
    }

    table {
        font-size: 12px;
    }

    th,
    td {
        padding: 0.5rem;
    }
}