body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 30px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    min-height: 80vh;
}

h1, h2, h3 {
    color: #2c3e50;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(45deg, #007bff, #0056b3);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    margin: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,123,255,0.3);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,123,255,0.4);
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9em;
}

.btn-danger {
    background: linear-gradient(45deg, #dc3545, #c82333);
    box-shadow: 0 4px 15px rgba(220,53,69,0.3);
}

.btn-danger:hover {
    box-shadow: 0 6px 20px rgba(220,53,69,0.4);
}

.btn-secondary {
    background: linear-gradient(45deg, #6c757d, #495057);
    box-shadow: 0 4px 15px rgba(108,117,125,0.3);
}

.btn-primary {
    background: linear-gradient(45deg, #28a745, #1e7e34);
    box-shadow: 0 4px 15px rgba(40,167,69,0.3);
}

.btn-success {
    background: linear-gradient(45deg, #28a745, #1e7e34);
    box-shadow: 0 4px 15px rgba(40,167,69,0.3);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

table th, table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

table th {
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    font-weight: 600;
    color: #495057;
}

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

form {
    margin-top: 20px;
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #495057;
}

input, textarea, select {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}

textarea {
    height: 100px;
    resize: vertical;
}

.message {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    font-weight: 500;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin: 30px 0;
    flex-wrap: wrap;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    flex: 1;
    margin: 10px;
    min-width: 200px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    transition: transform 0.3s ease;
}

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

.stat-card h3 {
    margin: 0 0 15px 0;
    font-size: 1.1em;
    opacity: 0.9;
}

.stat-card p {
    font-size: 2.5em;
    margin: 0;
    font-weight: bold;
}

.menu {
    text-align: center;
    margin: 40px 0;
}

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

.login-form {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-form h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

/* POS styles */
.pos-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.pos-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.pos-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.main-content {
    display: flex;
    gap: 20px;
}

.search-section {
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.search-section input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.search-section input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}

.products-grid {
    flex: 2;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.product-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

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

.product-card .price {
    font-size: 1.5em;
    font-weight: bold;
    color: #28a745;
    margin: 10px 0;
}

.product-card .stock {
    color: #6c757d;
    font-size: 0.9em;
}


.cart-section {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
}

.cart-item button {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 50%;
    width: 25px;
    height: 25px;
    cursor: pointer;
}

.total-section {
    margin-top: auto;
    text-align: center;
    font-size: 1.5em;
    font-weight: bold;
    color: #28a745;
}

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

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

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

.user-form {
    max-width: 500px;
    margin: 0 auto;
}

.product-row {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.sale-details {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}