:root {
    --bg-color: #F5F6FA;
    --action-color: #2ECC71;
    --text-color: #2C3E50;
    --text-muted: #95a5a6;
}

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

h1, h2, h3, h4, h5, h6 {
    color: var(--text-color);
}

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

.btn-primary:hover {
    background-color: #27ae60;
    border-color: #27ae60;
}

.list-item-done {
    opacity: 0.5;
    text-decoration: line-through;
    transition: all 0.3s ease;
}

.shopping-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    padding: 20px;
}