/* Global reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    height: 100vh;
    overflow: hidden;
    background: #f5f5f5;
}

/* Common color variables for consistency */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --secondary-light: #34495e;
    --accent-color: #e74c3c;
    --accent-dark: #c0392b;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --purple-color: #9b59b6;
    
    --text-color: #2c3e50;
    --text-muted: #7f8c8d;
    --text-light: #95a5a6;
    --text-very-light: #bdc3c7;
    
    --bg-color: #f5f5f5;
    --bg-white: white;
    --bg-light: #ecf0f1;
    --bg-lighter: #f8f9fa;
    --bg-dark: #1a252f;
    
    --border-color: #ddd;
    --border-light: #e0e0e0;
    --border-dark: #34495e;
    
    --shadow-light: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-dark: 0 2px 8px rgba(0,0,0,0.2);
}

/* Utility classes */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Common button styles */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-danger {
    background: var(--accent-color);
    color: white;
}

.btn-danger:hover {
    background: var(--accent-dark);
}

/* Common input styles */
.form-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.form-input:focus {
    border-color: var(--primary-color);
}

/* Common checkbox styles */
.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-container input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

/* Common badge styles */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-primary {
    background: var(--primary-color);
    color: white;
}

.badge-warning {
    background: var(--warning-color);
    color: white;
}

.badge-success {
    background: var(--success-color);
    color: white;
}

.badge-purple {
    background: var(--purple-color);
    color: white;
}