:root{--primary-color:#00f0ff;--bg-color:#0d1117;--bg-panel:#161b22b3;--text-main:#f0f6fc;--text-muted:#8b949e;--accent:#58a6ff;--border:#30363d80}body{background-color:var(--bg-color);color:var(--text-main);background-image:radial-gradient(circle at 15%,#00f0ff0d,#0000 25%),radial-gradient(circle at 85% 30%,#58a6ff0d,#0000 25%);justify-content:center;align-items:center;min-height:100vh;font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.6;display:flex}#root{justify-content:center;align-items:center;width:100%;height:100vh;padding:20px;display:flex}:root{--primary:#38bdf8;--primary-hover:#0ea5e9;--bg-sidebar:#0f172a;--bg-main:#1e293b;--bg-card:#334155;--text-main:#f8fafc;--text-muted:#94a3b8;--border:#ffffff1a;--accent:#38bdf8;--sidebar-width:260px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-main);font-family:Inter,system-ui,-apple-system,sans-serif;overflow:hidden}.dashboard-container{width:100vw;height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border);flex-direction:column;padding:24px 0;display:flex}.sidebar-brand{flex-direction:column;gap:8px;padding:0 24px 32px;display:flex}.sidebar-brand h2{color:#fff;font-size:1.25rem;font-weight:700}.sidebar-nav{flex-direction:column;flex:1;gap:4px;padding:0 12px;display:flex}.nav-item{color:var(--text-muted);cursor:pointer;border-radius:8px;align-items:center;gap:12px;padding:12px;font-size:.9rem;text-decoration:none;transition:all .2s;display:flex}.nav-item:hover,.nav-item.active{color:#fff;background:#ffffff0d}.nav-item svg{width:18px;height:18px}.sidebar-footer{border-top:1px solid var(--border);color:var(--text-muted);padding:24px;font-size:.75rem}.main-content{background:var(--bg-main);flex-direction:column;flex:1;display:flex;position:relative}.main-header{border-bottom:1px solid var(--border);background:#0f172a33;justify-content:space-between;align-items:center;height:64px;padding:0 32px;display:flex}.main-header h3{font-size:1rem;font-weight:500}.chat-window{flex-direction:column;flex:1;gap:32px;padding:40px 0;display:flex;overflow-y:auto}.chat-inner{width:100%;max-width:800px;margin:0 auto;padding:0 24px}.message{gap:16px;margin-bottom:24px;animation:.3s ease-out fadeIn;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.user{flex-direction:row-reverse}.avatar{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;display:flex}.user .avatar{background:var(--primary);color:#fff}.message-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;max-width:80%;padding:20px;box-shadow:0 4px 6px -1px #0000001a}.user .message-card{border:1px solid var(--primary);color:#fff;background:0 0}.ai .message-card{border:1px solid var(--border);background:#1e293b}.markdown-body{font-size:.95rem;line-height:1.6}.action-bar{border-top:1px solid var(--border);gap:12px;margin-top:16px;padding-top:12px;display:flex}.action-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;align-items:center;gap:6px;font-size:.75rem;display:flex}.action-btn:hover{color:var(--primary)}.input-section{background:linear-gradient(180deg, transparent, var(--bg-main) 20%);padding:24px 0 40px}.input-container{width:100%;max-width:800px;margin:0 auto;padding:0 24px}.input-box{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;align-items:center;gap:12px;padding:8px 16px;display:flex;box-shadow:0 10px 15px -3px #0000004d}.input-box input{color:#fff;background:0 0;border:none;flex:1;padding:12px 0;font-size:1rem}.input-box input:focus{outline:none}.send-button{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:8px 16px;font-weight:500;transition:background .2s}.send-button:hover:not(:disabled){background:var(--primary-hover)}.send-button:disabled{opacity:.5;cursor:not-allowed}.ref-list{border:1px dashed var(--border);background:#0f172a66;border-radius:8px;margin-top:12px;padding:16px;font-size:.8rem}.ref-tag{color:var(--primary);margin-bottom:4px;font-weight:600;display:block}.footer-badges{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:12px;display:flex}.badge{border:1px solid var(--border);color:var(--text-muted);background:#ffffff0d;border-radius:4px;padding:2px 8px;font-size:.65rem}.quiz-options{flex-direction:column;gap:12px;display:flex}.opt-item{border:1px solid var(--border);cursor:pointer;background:#ffffff05;border-radius:8px;gap:12px;padding:16px;transition:all .2s;display:flex}.opt-item:hover{border-color:var(--text-muted);background:#ffffff0d}.opt-item.selected{border-color:var(--primary);background:#38bdf81a}.opt-item.correct{background:#10b9811a;border-color:#10b981}.opt-item.wrong{background:#ef44441a;border-color:#ef4444}.opt-key{color:var(--primary);min-width:20px;font-weight:700}.stats-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-top:16px;display:grid}.stat-card{border:1px solid var(--border);background:#0f172a66;border-radius:12px;flex-direction:column;gap:8px;padding:20px;display:flex}.stat-bar{background:#ffffff1a;border-radius:3px;height:6px;margin-top:8px;overflow:hidden}.stat-fill{height:100%;transition:width .5s ease-out}.mistake-list{border:1px solid var(--border);border-radius:8px;max-height:400px;padding:16px;overflow-y:auto}.dot{background:var(--text-muted);border-radius:50%;width:8px;height:8px;animation:1.4s ease-in-out infinite both bounce}.dot:first-child{animation-delay:-.32s}.dot:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.modal-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:2000;background:#000c;justify-content:center;align-items:center;animation:.3s ease-out fadeIn;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg-card);border:1px solid var(--border);border-radius:20px;width:90%;max-width:800px;padding:40px;animation:.4s cubic-bezier(.16,1,.3,1) slideUp;box-shadow:0 25px 50px -12px #00000080}.mode-selection-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;display:grid}.mode-card{border:1px solid var(--border);cursor:pointer;text-align:center;background:#ffffff08;border-radius:16px;padding:24px;transition:all .3s}.mode-card:hover{border-color:var(--primary);background:#38bdf814;transform:translateY(-5px)}.mode-icon{margin-bottom:16px;font-size:2.5rem}.mode-card h4{color:#fff;margin-bottom:8px}.mode-card p{color:var(--text-muted);font-size:.85rem;line-height:1.5}.reinforce-btn{color:var(--primary);cursor:pointer;background:#38bdf81a;border:1px solid #38bdf833;border-radius:8px;justify-content:center;align-items:center;width:32px;height:32px;font-size:1.1rem;transition:all .2s;display:flex}.reinforce-btn:hover{background:var(--primary);color:#fff;transform:scale(1.1)}.loader{border:5px solid #fff;border-bottom-color:var(--primary);box-sizing:border-box;border-radius:50%;width:48px;height:48px;margin-bottom:20px;animation:1s linear infinite rotation;display:inline-block}@keyframes rotation{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}