:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-bg: #f8f9fa;
    --border-color: #dee2e6;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    min-height: 100vh;
}

/* Authentication Pages */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-box {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
}

.auth-logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.auth-box .form-control {
    padding: 12px;
    border-radius: 8px;
}

.auth-box .btn {
    padding: 12px;
    border-radius: 8px;
    font-weight: 500;
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
}

.card-header {
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 12px 12px 0 0 !important;
}

.card-body {
    padding: 20px;
}

/* Statistics Cards */
.stat-card {
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card .card-body {
    padding: 25px;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

/* Tables */
.table {
    margin-bottom: 0;
}

.table thead th {
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 12px;
    color: #6c757d;
    padding: 15px;
}

.table tbody td {
    padding: 15px;
    vertical-align: middle;
}

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

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
    transition: all 0.3s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}

/* Forms */
.form-label {
    font-weight: 500;
    margin-bottom: 8px;
    color: #495057;
}

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 10px 15px;
    transition: border-color 0.3s;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.1);
}

/* Navbar */
.navbar {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 20px;
}

.nav-link {
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover {
    color: rgba(255, 255, 255, 0.8) !important;
}

/* Badges */
.badge {
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 500;
}

/* Invoice Card */
.invoice-card {
    max-width: 900px;
    margin: 0 auto;
}

.invoice-card .card-body {
    padding: 40px;
}

/* Alerts */
.alert {
    border-radius: 8px;
    border: none;
    padding: 15px 20px;
}

.alert-dismissible .btn-close {
    padding: 18px 20px;
}

/* Modal */
.modal-content {
    border-radius: 12px;
    border: none;
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 20px;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 15px 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .auth-box {
        padding: 30px 20px;
    }
    
    .invoice-card .card-body {
        padding: 20px;
    }
    
    .stat-card .card-body {
        padding: 20px;
    }
}

/* Print Styles */
@media print {
    .no-print, .navbar, .btn, nav {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    body {
        background: white;
    }
}

/* Utilities */
.text-primary { color: var(--primary-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-info { color: var(--info-color) !important; }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-info { background-color: var(--info-color) !important; }