:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --text-color: #333;
    --background-color: #f4f4f4;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'SUIT', sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#mode-toggle {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

#stock-list, #chart-container, #trading-panel {
    background-color: white;
    margin: 1rem 0;
    padding: 1rem;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#stock-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

@media (max-width: 768px) {
    #app {
        padding: 0.5rem;
    }
    
    #stock-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}