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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f8fafc;
    color: #334155;
    line-height: 1.6;
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-header i {
    font-size: 1.75rem;
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-left-color: rgba(255, 255, 255, 0.3);
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.15);
    border-left-color: white;
}

.nav-item i {
    font-size: 1.25rem;
    width: 20px;
    text-align: center;
}

.nav-item span {
    font-weight: 500;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: white;
    padding: 1rem 2rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #64748b;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s;
}

.menu-toggle:hover {
    background-color: #f1f5f9;
}

.header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: #1e293b;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #64748b;
    font-weight: 500;
}

.user-info i {
    font-size: 1.5rem;
}

/* Page Content */
.page-content {
    flex: 1;
    padding: 2rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* Page Header */
.page-header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: #1e293b;
}

.page-description {
    color: #64748b;
    margin-top: 0.5rem;
    font-size: 0.95rem;
}

/* KPI Cards */
.kpi-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.kpi-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.kpi-icon {
    width: 60px;
    height: 60px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.kpi-card:nth-child(1) .kpi-icon {
    background: linear-gradient(135deg, #10b981, #059669);
}

.kpi-card:nth-child(2) .kpi-icon {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.kpi-card:nth-child(3) .kpi-icon {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.kpi-content h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: #64748b;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
    color: #1e293b;
}

/* Chart Container */
.chart-container {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

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

.chart-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
    margin: 0;
}

.chart-actions {
    display: flex;
    gap: 0.5rem;
}

.page-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.chart-container h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f1f5f9;
    color: #64748b;
    border: 1px solid #e2e8f0;
}

.btn-secondary:hover {
    background: #e2e8f0;
}

.btn-danger {
    background: #ef4444;
    color: white;
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* Tables */
.table-container {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: #f8fafc;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: #374151;
    border-bottom: 1px solid #e2e8f0;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid #f1f5f9;
    color: #64748b;
}

.data-table tbody tr:hover {
    background: #f8fafc;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    overflow-y: auto;
    padding: 2rem 0;
}

.modal-content {
    background-color: white;
    margin: 0 auto;
    padding: 0;
    border-radius: 1rem;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    animation: modalSlideIn 0.3s ease;
    overflow-y: auto;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
}

.close {
    color: #94a3b8;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.close:hover {
    color: #64748b;
}

/* Forms */
form {
    padding: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #374151;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e2e8f0;
}

/* Settings Grid */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.settings-card {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

.settings-card h3 {
    padding: 1.5rem;
    background: #f8fafc;
    border-bottom: 1px solid #e2e8f0;
    font-size: 1.125rem;
    font-weight: 600;
    color: #1e293b;
}

.settings-card-header {
    padding: 1.5rem;
    background: #f8fafc;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.settings-card-header h3 {
    padding: 0;
    background: none;
    border-bottom: none;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .kpi-cards {
        grid-template-columns: 1fr;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .page-content {
        padding: 1rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .data-table {
        font-size: 0.8rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.75rem 0.5rem;
    }
}

/* Loading States */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    color: #64748b;
}

.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid #e2e8f0;
    border-top: 2px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
}

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

/* Success/Error Messages */
.message {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: #64748b;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #cbd5e1;
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #475569;
}

.empty-state p {
    font-size: 0.875rem;
}