:root {
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #6c757d;
    --border-color: #e9ecef;
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    
    --radius: 8px;
    --transition: all 0.2s ease-in-out;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --card-bg: #1e1e1e;
        --text-primary: #f8f9fa;
        --text-secondary: #adb5bd;
        --border-color: #2b2b2b;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
}