:root {
    --primary-color: #2196F3;
    --success-color: #4CAF59;
    --danger-color: #F44336;
    --card-background: #FFFFFF;
    --text-color: #333333;
    --border-color: #E0E0E0;
}

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

body {
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.btn {
    padding: 8px 16px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: opacity 0.3s;
}

.btn:hover {
    opacity: 0.9;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    padding: 20px;
    border-radius: 8px;
    background-color: var(--card-background);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card h3 {
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--text-color);
}

.card .value {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.change {
    font-size: 0.9rem;
}

.change.positive {
    color: var(--success-color);
}

.change.negative {
    color: var(--danger-color);
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.chart-card {
    padding: 20px;
    border-radius: 8px;
    background-color: var(--card-background);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.broker-breakdown {
    margin-bottom: 30px;
}

.broker-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

footer {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

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

    header {
        flex-direction: column;
        gap: 10px;
    }

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