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.2s}.tab.active{background:var(--primary);color:#fff}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}@media (max-width: 768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}@media (min-width: 769px) and (max-width: 1024px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}.alert{padding:12px 16px;border-radius:var(--radius-sm);font-weight:600;font-size:14px;margin-bottom:16px}.alert-error{background:#fee2e2;color:#dc2626;border-left:4px solid #DC2626}.alert-success{background:#dcfce7;color:#16a34a;border-left:4px solid #16A34A}.alert-info{background:#dbeafe;color:#1d4ed8;border-left:4px solid #1D4ED8}.spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin:40px auto}@keyframes spin{to{transform:rotate(360deg)}}.loading-center{display:flex;justify-content:center;align-items:center;padding:60px}.divider{border:none;border-top:2px solid var(--border);margin:24px 0}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.section-header h2{font-size:22px;color:var(--text)}.empty-state{text-align:center;padding:60px 24px;color:var(--text-muted)}.empty-state .emoji{font-size:64px;margin-bottom:16px}.empty-state h3{font-size:20px;color:var(--text);margin-bottom:8px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:24px}.modal{background:#fff;border-radius:var(--radius);width:100%;max-width:500px;max-height:90vh;overflow-y:auto;padding:32px;position:relative}.modal-close{position:absolute;top:16px;right:16px;background:var(--border);border:none;border-radius:50%;width:32px;height:32px;font-size:18px;display:flex;align-items:center;justify-content:center;cursor:pointer}.lesson-content h2{font-size:20px;margin:24px 0 12px;color:var(--primary)}.lesson-content h3{font-size:17px;margin:20px 0 8px;color:var(--text)}.lesson-content p{margin-bottom:14px;line-height:1.8}.lesson-content ul,.lesson-content ol{margin:12px 0 12px 24px}.lesson-content li{margin-bottom:6px;line-height:1.7}.lesson-content strong{color:var(--primary);font-weight:800}.lesson-content em{font-style:italic}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}