:root{--accent: #6366f1;--accent-light: #818cf8;--accent-dark: #4f46e5;--bg: #f8fafc;--bg-secondary: #f1f5f9;--text-primary: #0f172a;--text-secondary: #64748b;--border: #e2e8f0;--success: #10b981;--warning: #f59e0b;--shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, .05);--shadow-md: 0 4px 12px 0 rgba(15, 23, 42, .08);--shadow-lg: 0 10px 24px 0 rgba(15, 23, 42, .1)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;margin:0;background:var(--bg);color:var(--text-primary);line-height:1.6}input,textarea,button,select{font-family:inherit;font-size:14px}input,textarea,select{padding:10px 12px;border:1px solid var(--border);border-radius:8px;width:100%;transition:all .2s ease;background:#fff}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #6366f11a}input::placeholder,textarea::placeholder{color:var(--text-secondary)}.container{max-width:1200px;margin:0 auto;padding:16px}.card{background:#fff;border-radius:12px;padding:20px;box-shadow:var(--shadow-sm);margin-bottom:16px;border:1px solid var(--border);transition:all .2s ease}.card:hover{box-shadow:var(--shadow-md)}.header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-dark) 100%);box-shadow:var(--shadow-md);border-radius:0;margin-bottom:24px;gap:16px}.header strong{color:#fff;font-size:18px;display:flex;align-items:center;gap:8px}.header a{color:#fff;text-decoration:none;font-weight:500}.header-actions{display:flex;gap:8px;align-items:center}.btn{background:var(--accent);color:#fff;padding:10px 16px;border-radius:8px;border:none;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s ease;display:inline-flex;align-items:center;gap:6px}.btn:hover:not(:disabled){background:var(--accent-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn:active:not(:disabled){transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.secondary{background:transparent;color:var(--accent);border:1.5px solid var(--accent)}.btn.secondary:hover:not(:disabled){background:var(--accent);color:#fff}.grid{display:grid;grid-template-columns:1fr 320px;gap:24px}@media(max-width:768px){.grid{grid-template-columns:1fr}.header{flex-direction:column;text-align:center}.header-actions{flex-wrap:wrap;justify-content:center;width:100%}}.lessons-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}.lesson{padding:16px;border-radius:10px;border:1.5px solid var(--border);background:#fff;transition:all .2s ease;cursor:default}.lesson:not(.locked):hover{border-color:var(--accent);box-shadow:var(--shadow-md);transform:translateY(-2px)}.lesson.locked{opacity:.55;background:var(--bg-secondary);filter:grayscale(.4);-webkit-user-select:none;user-select:none}.lesson-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:10px}.lesson-title{font-weight:600;font-size:15px;color:var(--text-primary)}.lesson-badge{font-size:18px}.lesson-actions{display:flex;gap:6px;margin-top:10px}.report{width:100%;min-height:100px;padding:12px;border:1px solid var(--border);border-radius:8px;font-family:inherit;resize:vertical;transition:all .2s ease}.report:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #6366f11a}.profile-card{display:flex;gap:16px;align-items:center;background:linear-gradient(135deg,#6366f10d,#6366f105);padding:20px;border-radius:12px;border:1px solid var(--border)}.avatar{width:80px;height:80px;min-width:80px;border-radius:10px;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-light) 100%);display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;font-size:28px;box-shadow:var(--shadow-md)}.avatar img{width:100%;height:100%;border-radius:10px;object-fit:cover}.profile-info{flex:1}.profile-nick{font-size:18px;font-weight:700;color:var(--text-primary);margin:0 0 4px}.profile-crystals{font-size:14px;color:var(--text-secondary);margin:0;display:flex;align-items:center;gap:6px}.leaderboard{list-style:none;padding:0;margin:0}.leaderboard li{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border);transition:all .2s ease}.leaderboard li:hover{background:var(--bg-secondary);padding-left:6px;padding-right:6px}.leaderboard li:last-child{border-bottom:none}.leaderboard-rank{font-weight:700;color:var(--accent);width:24px;text-align:center}.leaderboard-rank.top1{font-size:18px}.leaderboard-name{flex:1;font-weight:500;color:var(--text-primary);margin-left:8px}.leaderboard-score{font-weight:700;color:var(--accent);display:flex;align-items:center;gap:4px}h2,h3,h4,h5{margin:0 0 12px;color:var(--text-primary)}h2{font-size:28px;font-weight:700}h3{font-size:20px;font-weight:700}h4{font-size:16px;font-weight:600}p{margin:0 0 12px;color:var(--text-secondary)}.section-header{display:flex;align-items:center;gap:10px;margin-bottom:16px}.section-header h3{margin:0}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-weight:500;color:var(--text-primary);font-size:14px}.success-banner{background:#d1fae5;color:#065f46;padding:12px 16px;border-radius:8px;border-left:4px solid var(--success);margin-bottom:16px}.error-banner{background:#fee2e2;color:#7f1d1d;padding:12px 16px;border-radius:8px;border-left:4px solid #ef4444;margin-bottom:16px}.badge{display:inline-flex;align-items:center;gap:4px;padding:4px 8px;background:var(--bg-secondary);border-radius:6px;font-size:12px;font-weight:600;color:var(--accent)}.loading{display:flex;justify-content:center;align-items:center;min-height:200px;color:var(--text-secondary)}