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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 2rem;
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.header h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.header h1 i {
    color: #3498db;
    margin-right: 0.5rem;
}

.header p {
    color: #7f8c8d;
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    display: grid;
    gap: 2rem;
}

/* Form Section */
.form-section {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.form-section h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.form-section h2 i {
    color: #27ae60;
    margin-right: 0.5rem;
}

.inventory-form {
    display: grid;
    gap: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.form-group input {
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #fafafa;
}

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

.form-group input:invalid {
    border-color: #e74c3c;
}

.error-message {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 0.25rem;
    min-height: 1rem;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: #3498db;
    border: 2px solid #3498db;
}

.btn-outline:hover {
    background: #3498db;
    color: white;
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

/* Summary Section */
.summary-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.summary-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    text-align: center;
}

.summary-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.summary-card h3 i {
    color: #3498db;
    margin-right: 0.5rem;
}

.total-amount {
    font-size: 2rem;
    font-weight: 700;
    color: #27ae60;
}

.total-count {
    font-size: 2rem;
    font-weight: 700;
    color: #3498db;
}

/* Table Section */
.table-section {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.table-header h2 {
    color: #2c3e50;
    font-size: 1.5rem;
    font-weight: 600;
}

.table-header h2 i {
    color: #9b59b6;
    margin-right: 0.5rem;
}

.table-container {
    overflow-x: auto;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
}

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

.inventory-table thead {
    background: #34495e;
    color: white;
}

.inventory-table th,
.inventory-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.inventory-table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.inventory-table tbody tr:nth-child(even) {
    background: #f8f9fa;
}

.inventory-table tbody tr:hover:not(.empty-state) {
    background: #e3f2fd;
    transform: scale(1.01);
    transition: all 0.2s ease;
}

.empty-state td {
    text-align: center;
    padding: 3rem 1rem;
}

.empty-message {
    color: #7f8c8d;
}

.empty-message i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #bdc3c7;
}

.empty-message p {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.empty-message small {
    font-size: 0.9rem;
}

/* Action Buttons in Table */
.action-btn {
    padding: 0.25rem 0.5rem;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    margin: 0 0.125rem;
    transition: all 0.2s ease;
}

.edit-btn {
    background: #f39c12;
    color: white;
}

.edit-btn:hover {
    background: #e67e22;
    transform: scale(1.1);
}

.delete-btn {
    background: #e74c3c;
    color: white;
}

.delete-btn:hover {
    background: #c0392b;
    transform: scale(1.1);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    margin: 15% auto;
    padding: 2rem;
    border-radius: 15px;
    width: 90%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-content h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.modal-content h3 i {
    color: #e74c3c;
    margin-right: 0.5rem;
}

.modal-content p {
    margin-bottom: 1.5rem;
    color: #7f8c8d;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .table-header {
        flex-direction: column;
        align-items: stretch;
    }

    .inventory-table th,
    .inventory-table td {
        padding: 0.5rem;
        font-size: 0.85rem;
    }

    .modal-content {
        margin: 30% auto;
        padding: 1.5rem;
    }

    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1rem;
    }

    .form-section,
    .table-section {
        padding: 1rem;
    }

    .inventory-table th,
    .inventory-table td {
        padding: 0.25rem;
        font-size: 0.75rem;
    }

    .action-btn {
        padding: 0.125rem 0.25rem;
        font-size: 0.7rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Focus and Accessibility */
button:focus,
input:focus {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}