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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

/* Loading Spinner */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Navigation */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Auth Container */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}

.auth-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.auth-header i.fa-shield-alt {
    color: #28a745;
}

.auth-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.auth-header p {
    color: #666;
    font-style: italic;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #e1e5e9;
}

.auth-footer small {
    color: #6c757d;
    font-size: 0.85rem;
}

.auth-footer i {
    color: #ffc107;
    margin-right: 0.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: #666;
}

.auth-switch a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* App Container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Dashboard Header */
.dashboard-header {
    margin-bottom: 2rem;
}

.header-content {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.header-content h1 {
    font-size: 2rem;
    color: #333;
    margin: 0 1rem 0 0;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.import-export-buttons {
    display: flex;
    gap: 0.5rem;
}

/* Make file input look like a button */
#import-file {
    position: absolute;
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    z-index: -1;
}

/* Style the file input label as a button */
label[for="import-file"] {
    cursor: pointer;
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.stat-info h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 0.25rem;
}

.stat-info p {
    color: #666;
    font-size: 0.9rem;
}

/* Charts Section */
.charts-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.chart-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.chart-card h3 {
    margin-bottom: 1.5rem;
    color: #333;
}

.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-container canvas {
    max-height: 300px;
    width: 100% !important;
    height: 100% !important;
    position: absolute;
    top: 0;
    left: 0;
}

.chart-placeholder {
    height: 300px;
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #999;
    border: 2px dashed #ddd;
    border-radius: 8px;
    background: #fafafa;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

.chart-placeholder.show {
    display: flex;
}

.chart-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #ccc;
}

.chart-placeholder p {
    font-size: 1rem;
    text-align: center;
    margin: 0;
}

/* Expenses Section */
.expenses-section {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

.section-header h3 {
    color: #333;
}

.filter-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-controls select,
.filter-controls input {
    padding: 0.5rem;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 0.9rem;
}

/* Expenses List */
.expenses-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.expense-item {
    display: flex;
    justify-content: between;
    align-items: center;
    padding: 1rem;
    border: 1px solid #e1e5e9;
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.expense-item:hover {
    background: #f8f9fa;
    border-color: #667eea;
    transform: translateX(5px);
}

.expense-info {
    flex: 1;
}

.expense-description {
    font-weight: 500;
    color: #333;
    margin-bottom: 0.25rem;
}

.expense-meta {
    font-size: 0.9rem;
    color: #666;
}

.expense-amount {
    font-size: 1.2rem;
    font-weight: 700;
    color: #dc3545;
}

.expense-category {
    padding: 0.25rem 0.75rem;
    background: #667eea;
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-left: 1rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.modal-content {
    background: white;
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid #e1e5e9;
}

.modal-header h3 {
    color: #333;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.modal-close:hover {
    background: #f8f9fa;
    color: #333;
}

.modal form {
    padding: 2rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: 8px;
    padding: 1rem 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    display: none;
    align-items: center;
    gap: 1rem;
    z-index: 3000;
    max-width: 400px;
}

.notification.show {
    display: flex;
    animation: slideIn 0.3s ease;
}

.notification.success {
    border-left: 4px solid #28a745;
    color: #155724;
}

.notification.error {
    border-left: 4px solid #dc3545;
    color: #721c24;
}

.notification.info {
    border-left: 4px solid #17a2b8;
    color: #0c5460;
}

.notification button {
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.notification button:hover {
    background: #f8f9fa;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: #666;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: #ddd;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
    }
    
    .nav-brand span {
        display: none;
    }
    
    .app-container {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-section {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-controls {
        justify-content: stretch;
    }
    
    .filter-controls select,
    .filter-controls input {
        flex: 1;
    }
    
    .expense-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .expense-category {
        align-self: flex-start;
        margin-left: 0;
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .auth-container {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: 1.5rem;
    }
    
    .modal {
        padding: 1rem;
    }
    
    .modal form {
        padding: 1.5rem;
    }
    
    .modal-header {
        padding: 1rem 1.5rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    /* Add dark mode styles if needed */
}