/* css/common.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    width: 100%;
    min-height: 100vh;
    background: white;
}

/* Common panel styles */
.panel {
    background: white;
    border-radius: 8px;
    padding: 15px;
    border: 1px solid #e1e5e9;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}




/* Utility classes */
.hidden {
    display: none !important;
}


/* Loading spinner */
.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}