/* Global styles for Math Revision Platform */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
}

.worksheet-card {
    transition: transform 0.2s, box-shadow 0.2s;
}

.worksheet-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.katex-display {
    margin: 1em 0;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 9999px;
}

.badge-easy { background-color: #d1fae5; color: #065f46; }
.badge-medium { background-color: #fef3c7; color: #92400e; }
.badge-difficult { background-color: #fee2e2; color: #991b1b; }
.badge-ks3 { background-color: #dbeafe; color: #1e40af; }
.badge-ks4 { background-color: #e0e7ff; color: #3730a3; }