/* 蓝色商务风 */
:root {
    --primary: #2c3e50;
    --primary-dark: #1a252f;
    --primary-light: #ecf0f1;
    --secondary: #3498db;
    --bg: #ecf0f1;
    --card-bg: #fff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #dfe6e9;
    --hover-bg: #f8f9fa;
    --todo-color: #e74c3c;
    --doing-color: #f39c12;
    --done-color: #27ae60;
}