/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    background-color: #f5f5f5;
    color: #333;
}

.wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
    color: #ecf0f1;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 20px;
    background-color: rgba(0,0,0,0.2);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.sidebar-nav ul {
    list-style: none;
    padding: 10px 0;
}

.sidebar-nav li {
    margin: 2px 0;
}

.sidebar-nav li.nav-section {
    padding: 15px 20px 5px;
    font-size: 11px;
    text-transform: uppercase;
    color: #95a5a6;
    font-weight: 600;
    letter-spacing: 1px;
}

.sidebar-nav a {
    display: block;
    padding: 12px 20px;
    color: #ecf0f1;
    text-decoration: none;
    transition: all 0.3s;
}

.sidebar-nav a:hover {
    background-color: rgba(255,255,255,0.1);
    padding-left: 25px;
}

.sidebar-nav li.active a {
    background-color: #3498db;
    border-left: 3px solid #2980b9;
}

.sidebar-nav a i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

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

/* Top Bar */
.topbar {
    background-color: #fff;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 999;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #333;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-name {
    font-weight: 500;
}

.logout-btn {
    color: #e74c3c;
    text-decoration: none;
    padding: 8px 15px;
    border: 1px solid #e74c3c;
    border-radius: 4px;
    transition: all 0.3s;
}

.logout-btn:hover {
    background-color: #e74c3c;
    color: #fff;
}

/* Page Content */
.page-content {
    flex: 1;
    padding: 30px;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.page-header h1 {
    font-size: 28px;
    color: #2c3e50;
}

/* Cards */
.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid #ecf0f1;
    font-weight: 600;
    font-size: 16px;
    color: #2c3e50;
}

.card-body {
    padding: 20px;
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-card.blue {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.stat-card.green {
    background: linear-gradient(135deg, #0ba360 0%, #3cba92 100%);
}

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

.stat-card.red {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.stat-card h3 {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-card .icon {
    float: right;
    font-size: 48px;
    opacity: 0.3;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background-color: #3498db;
    color: #fff;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-success {
    background-color: #27ae60;
    color: #fff;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-danger {
    background-color: #e74c3c;
    color: #fff;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-warning {
    background-color: #f39c12;
    color: #fff;
}

.btn-warning:hover {
    background-color: #e67e22;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #2c3e50;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.form-control:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
}

table thead {
    background-color: #f8f9fa;
}

table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: #2c3e50;
    border-bottom: 2px solid #dee2e6;
}

table td {
    padding: 12px;
    border-bottom: 1px solid #dee2e6;
}

table tbody tr:hover {
    background-color: #f8f9fa;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
    position: relative;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.close-alert {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    opacity: 0.5;
}

.close-alert:hover {
    opacity: 1;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 3px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background-color: #27ae60;
    color: #fff;
}

.badge-warning {
    background-color: #f39c12;
    color: #fff;
}

.badge-danger {
    background-color: #e74c3c;
    color: #fff;
}

.badge-info {
    background-color: #3498db;
    color: #fff;
}

/* Footer */
.footer {
    padding: 20px 30px;
    background-color: #fff;
    text-align: center;
    color: #7f8c8d;
    border-top: 1px solid #ecf0f1;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

/* Invoice Specific Styles */
.invoice-items-table {
    margin: 20px 0;
}

.invoice-items-table input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 3px;
}

.invoice-total {
    margin-top: 20px;
    text-align: right;
}

.invoice-total table {
    margin-left: auto;
    width: 300px;
}

.invoice-total td {
    padding: 8px;
}

.invoice-total .grand-total {
    font-size: 18px;
    font-weight: 700;
    background-color: #f8f9fa;
}

/* Print Styles */
@media print {
    .sidebar, .topbar, .btn, .footer {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .page-content {
        padding: 0;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        margin-left: -260px;
    }
    
    .sidebar.active {
        margin-left: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}