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

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.main-nav {
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.main-nav h1 {
    font-size: 24px;
    color: var(--primary);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 5px;
}

.main-nav a {
    display: block;
    padding: 10px 20px;
    color: var(--gray-700);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
}

.main-nav a:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.main-nav a.active {
    background: var(--primary);
    color: white;
}

/* Cards & Panels */
.card {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.card h2, .card h3 {
    margin-bottom: 20px;
    color: var(--gray-800);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--gray-900);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card.success {
    border-left: 4px solid var(--success);
}

.stat-card.warning {
    border-left: 4px solid var(--warning);
}

.stat-card.info {
    border-left: 4px solid var(--info);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

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

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

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #059669;
}

.btn-warning {
    background: var(--warning);
    color: white;
}

.btn-warning:hover {
    background: #d97706;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

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

.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--gray-700);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 16px;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

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

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

thead {
    background: var(--gray-100);
}

th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-300);
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--gray-200);
}

tr:hover {
    background: var(--gray-50);
}

.price {
    font-weight: 600;
    color: var(--success);
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success);
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--info);
}

/* Modal/Popup */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 8px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-close {
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-600);
    background: none;
    border: none;
}

.modal-close:hover {
    color: var(--gray-900);
}

/* Receipt */
.receipt {
    max-width: 400px;
    margin: 0 auto;
    padding: 30px;
    background: white;
    border: 2px dashed var(--gray-300);
}

.receipt-header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--gray-300);
}

.receipt-header h2 {
    margin-bottom: 5px;
}

.receipt-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--gray-200);
}

.receipt-total {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    font-size: 18px;
    font-weight: bold;
    border-top: 2px solid var(--gray-300);
    margin-top: 10px;
}

.receipt-footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid var(--gray-300);
    color: var(--gray-600);
    font-size: 14px;
}

/* Payment screen */
.payment-summary {
    background: var(--gray-50);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.payment-items {
    margin-bottom: 15px;
}

.payment-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--gray-200);
}

.payment-total {
    display: flex;
    justify-content: space-between;
    font-size: 24px;
    font-weight: bold;
    padding-top: 15px;
    border-top: 2px solid var(--gray-300);
}

.payment-methods {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.payment-method {
    padding: 30px;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.payment-method:hover {
    border-color: var(--primary);
    background: var(--gray-50);
}

.payment-method.selected {
    border-color: var(--primary);
    background: #dbeafe;
}

.payment-method-icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.payment-method-label {
    font-size: 18px;
    font-weight: 600;
}

/* Dashboard specific */
.dashboard h2 {
    margin-bottom: 25px;
    color: var(--gray-800);
}

.quick-actions {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.open-biedingen {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Print styles */
@media print {
    body * {
        visibility: hidden;
    }
    
    .receipt, .receipt * {
        visibility: visible;
    }
    
    .receipt {
        position: absolute;
        left: 0;
        top: 0;
        border: none;
    }
    
    .no-print {
        display: none !important;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .main-nav .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .payment-methods {
        grid-template-columns: 1fr;
    }
}