:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #22d3ee;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1f2937;
    --light: #f9fafb;
    --text: #111827;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --gradient: linear-gradient(135deg, var(--primary), var(--primary-dark));
    --nav-gradient: linear-gradient(135deg, #1e293b 0%, #2d3748 100%);
}

[data-theme="dark"] {
    --light: #1f2937;
    --dark: #f9fafb;
    --text: #f9fafb;
    --border: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--light);
    color: var(--text);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: var(--gradient);
    color: white;
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px var(--shadow);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    z-index: 1;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    position: relative;
    z-index: 2;
}

.header-stats {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}

.stat-card {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    flex: 1;
    min-width: 150px;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    color: white;
}

.controls {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--light);
    color: var(--text);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
    transform: translateY(-2px);
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.chart-container {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chart-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow);
}

.chart-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text);
}

.data-table-section {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border);
}

.table-container {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border);
}

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

#transactionTable th,
#transactionTable td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

#transactionTable th {
    background: var(--light);
    font-weight: 600;
    color: var(--text);
    position: sticky;
    top: 0;
    z-index: 10;
}

#transactionTable tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px;
    font-size: 1.1rem;
    color: var(--primary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

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

.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid rgba(239, 68, 68, 0.3);
    text-align: center;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
}

.status-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .header-stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .stat-card {
        min-width: auto;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .chart-container {
        padding: 15px;
    }
    
    .table-container {
        font-size: 0.9rem;
    }
    
    #transactionTable th,
    #transactionTable td {
        padding: 8px 12px;
    }
}

/* Advanced animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.chart-container {
    animation: slideIn 0.6s ease-out;
}

.loading {
    animation: fadeIn 0.3s ease-out;
}

/* Metric cards animations */
.stat-card {
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow);
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Focus states */
.btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.chart-container:focus-within {
    box-shadow: 0 0 0 3px var(--primary);
}

/* Loading states */
.loading .spinner {
    animation: spin 1s linear infinite;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}