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

:root {
    --primary-color: #4f46e5;
    --secondary-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark: #1f2937;
    --light: #f9fafb;
    --border: #e5e7eb;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid var(--primary-color);
}

header h1 {
    color: var(--dark);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    color: #6b7280;
    font-size: 1.1rem;
}

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

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background: #4338ca;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

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

.btn-secondary:hover {
    background: #0891b2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.4);
}

.status {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--light);
    border-radius: 20px;
}

.status-indicator {
    width: 10px;
    height: 10px;
    background: var(--success-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-left: 4px solid;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.card-revenue {
    border-color: var(--success-color);
}

.card-expense {
    border-color: var(--danger-color);
}

.card-profit {
    border-color: var(--primary-color);
}

.card-margin {
    border-color: var(--warning-color);
}

.card-icon {
    font-size: 3rem;
}

.card-content h3 {
    color: #6b7280;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.card-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
}

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

.chart-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.chart-card.full-width {
    grid-column: 1 / -1;
}

.chart-card h3 {
    margin-bottom: 20px;
    color: var(--dark);
    font-size: 1.2rem;
}

.tables-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.table-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.table-card.full-width {
    grid-column: 1 / -1;
}

.table-card h3 {
    margin-bottom: 20px;
    color: var(--dark);
    font-size: 1.2rem;
}

.table-responsive {
    overflow-x: auto;
}

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

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

th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

tbody tr:hover {
    background: var(--light);
}

.error-message {
    background: #fee2e2;
    color: var(--danger-color);
    padding: 16px;
    border-radius: 8px;
    border-left: 4px solid var(--danger-color);
    margin: 20px 0;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: white;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .summary-cards {
        grid-template-columns: 1fr;
    }

    .charts-container,
    .tables-container {
        grid-template-columns: 1fr;
    }

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

    .status {
        margin-left: 0;
        justify-content: center;
    }
}