*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0d0f14;--surface:#161921;--surface-2:#1e2130;--border:#2a2d3e;--accent:#7c6bff;--accent-dim:#7c6bff26;--text:#c8cad8;--text-dim:#6b7280;--text-bright:#eef0fb;--user-bg:#1d2147;--user-border:#3a3f7a;--ai-bg:#161921;--radius:14px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;font:15px/1.6 var(--sans);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}body{height:100dvh;overflow:hidden}#app{justify-content:center;align-items:center;height:100dvh;display:flex}.hidden{display:none!important}#model-select-screen{background:var(--bg);justify-content:center;align-items:center;width:100%;height:100%;padding:24px 16px;display:flex;overflow-y:auto}.model-select-content{text-align:center;flex-direction:column;align-items:center;gap:20px;width:min(820px,100%);display:flex}.model-select-content h1{color:var(--text-bright);letter-spacing:-.5px;font-size:26px;font-weight:600}.model-select-subtitle{color:var(--text-dim);max-width:520px;font-size:14px;line-height:1.6}.model-cards{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;width:100%;display:grid}.model-card{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);cursor:pointer;text-align:left;font-family:var(--sans);color:var(--text);flex-direction:column;gap:10px;padding:20px 18px 18px;transition:border-color .2s,background .2s,transform .15s;display:flex;position:relative}.model-card:hover{border-color:var(--accent);background:var(--surface-2);transform:translateY(-2px)}.model-card:active{transform:translateY(0)}.model-card.recommended{border-color:var(--accent);background:color-mix(in srgb, var(--surface) 85%, var(--accent) 15%)}.model-card-badge{background:var(--accent);color:#fff;letter-spacing:.5px;white-space:nowrap;border-radius:99px;padding:2px 10px;font-size:11px;font-weight:700;position:absolute;top:-11px;left:50%;transform:translate(-50%)}.model-card-icon{font-size:22px;line-height:1}.model-card-body{flex-direction:column;gap:4px;display:flex}.model-card-name{color:var(--text-bright);font-size:16px;font-weight:700}.model-card-tag{text-transform:uppercase;letter-spacing:.7px;color:var(--accent);font-size:11px;font-weight:600}.model-card-desc{color:var(--text-dim);margin-top:6px;font-size:13px;line-height:1.55}.model-card-stats{flex-wrap:wrap;gap:6px;margin-top:8px;list-style:none;display:flex}.model-card-stats li{color:var(--text-dim);background:var(--surface-2);border:1px solid var(--border);border-radius:6px;padding:2px 8px;font-size:11px}.model-select-footnote{color:var(--text-dim);max-width:480px;font-size:13px}.model-select-footnote strong{color:var(--text)}#loading-screen{background:var(--bg);justify-content:center;align-items:center;width:100%;height:100%;display:flex}.loading-content{text-align:center;flex-direction:column;align-items:center;gap:16px;width:min(420px,90vw);display:flex}.loading-icon{width:52px;height:52px;color:var(--accent);animation:3s linear infinite spin}.loading-icon svg{width:100%;height:100%}@keyframes spin{to{transform:rotate(360deg)}}.loading-content h1{color:var(--text-bright);letter-spacing:-.5px;font-size:26px;font-weight:600}.loading-subtitle{color:var(--text-dim);font-size:14px}.progress-bar-track{background:var(--surface-2);border-radius:99px;width:100%;height:6px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--accent), #a78bfa);border-radius:99px;width:0%;height:100%;transition:width .3s}.loading-status{color:var(--text-dim);min-height:1.4em;font-size:13px}#chat-screen{background:var(--bg);flex-direction:column;width:min(780px,100vw);height:100dvh;display:flex}.chat-header{border-bottom:1px solid var(--border);background:var(--surface);flex-shrink:0;justify-content:space-between;align-items:center;padding:14px 20px;display:flex}.header-left{align-items:center;gap:12px;display:flex}.header-icon{width:32px;height:32px;color:var(--accent);flex-shrink:0}.header-icon svg{width:100%;height:100%}.chat-header h1{color:var(--text-bright);font-size:17px;font-weight:600;line-height:1.2}.model-badge{color:var(--text-dim);white-space:nowrap;text-overflow:ellipsis;max-width:280px;margin-top:2px;font-size:11px;display:block;overflow:hidden}.status-dot{background:var(--text-dim);border-radius:50%;flex-shrink:0;width:10px;height:10px;transition:background .4s}.status-dot.ready{background:#4ade80;box-shadow:0 0 6px #4ade8088}.messages{scroll-behavior:smooth;flex-direction:column;flex:1;gap:20px;padding:24px 20px;display:flex;overflow-y:auto}.messages:empty:before{content:"Your move — what is your opening question?";text-align:center;color:var(--text-dim);margin:auto;font-size:14px;display:block}.message{max-width:85%;display:flex}.message.user{flex-direction:row-reverse;align-self:flex-end}.message.assistant{align-self:flex-start}.bubble{border-radius:var(--radius);white-space:pre-wrap;word-break:break-word;padding:12px 16px;font-size:15px;line-height:1.65}.message.user .bubble{background:var(--user-bg);border:1px solid var(--user-border);color:var(--text-bright);border-bottom-right-radius:4px}.message.assistant .bubble{background:var(--surface);border:1px solid var(--border);color:var(--text);border-bottom-left-radius:4px;min-width:60px;min-height:44px}.message.assistant .bubble:empty:after{content:"▋";color:var(--accent);animation:.8s step-end infinite blink}@keyframes blink{50%{opacity:0}}.bubble.error{color:#f87171;background:#1c0a0a;border-color:#7f1d1d}.bubble.blocked{color:#fbbf24;background:#1c1205;border-color:#78350f;font-style:italic}.chat-footer{border-top:1px solid var(--border);background:var(--surface);flex-shrink:0;padding:14px 20px 20px}.input-row{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);align-items:flex-end;gap:10px;padding:10px 10px 10px 16px;transition:border-color .2s;display:flex}.input-row:focus-within{border-color:var(--accent)}.chat-input{resize:none;color:var(--text-bright);font:15px/1.6 var(--sans);background:0 0;border:none;outline:none;flex:1;max-height:160px;overflow-y:auto}.chat-input::placeholder{color:var(--text-dim)}.send-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;transition:background .2s,opacity .2s,transform .1s;display:flex}.send-btn:hover:not(:disabled){background:#6354e0;transform:scale(1.05)}.send-btn:active:not(:disabled){transform:scale(.96)}.send-btn:disabled{opacity:.35;cursor:not-allowed}.send-btn.stop{opacity:1;background:#ef4444}.send-btn.stop:hover{background:#dc2626}.send-btn svg{width:18px;height:18px}.footer-note{text-align:center;color:var(--text-dim);margin-top:10px;font-size:12px}.messages::-webkit-scrollbar{width:6px}.messages::-webkit-scrollbar-track{background:0 0}.messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:99px}.level-panel{border-bottom:1px solid var(--border);background:var(--surface);flex-direction:column;flex-shrink:0;gap:6px;padding:12px 20px;display:flex}.level-panel-top{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.level-title-group{flex-direction:column;gap:2px;min-width:0;display:flex}.level-badge{color:var(--accent);text-transform:uppercase;letter-spacing:.8px;font-size:11px;font-weight:600}.level-title{color:var(--text-bright);font-size:15px;font-weight:600;line-height:1.2}.level-desc{color:var(--text-dim);font-size:13px;line-height:1.5}.hint-row{flex-wrap:wrap;align-items:baseline;gap:10px;display:flex}.hint-btn{color:var(--accent);cursor:pointer;font-size:12px;font-family:var(--sans);opacity:.75;background:0 0;border:none;flex-shrink:0;padding:0;transition:opacity .2s}.hint-btn:hover{opacity:1}.level-hint{color:var(--text-dim);font-size:13px;font-style:italic}.level-dots{flex-shrink:0;align-items:center;gap:7px;padding-top:2px;display:flex}.level-dot{background:var(--surface-2);border:1.5px solid var(--border);cursor:default;border-radius:50%;width:11px;height:11px;padding:0;transition:background .3s,border-color .3s,transform .2s}.level-dot.active{background:var(--accent-dim);border-color:var(--accent);transform:scale(1.15)}.level-dot.done{cursor:pointer;background:#4ade80;border-color:#4ade8099}.level-dot.done:hover{background:#22c55e;transform:scale(1.1)}.message.system{align-self:stretch;max-width:100%}.bubble.success-bubble{border-radius:var(--radius);background:linear-gradient(135deg,#4ade8014,#7c6bff1a);border:1px solid #4ade8059;flex-wrap:wrap;align-items:center;gap:16px;padding:16px 20px;display:flex}.success-icon{flex-shrink:0;font-size:30px;line-height:1}.success-text{flex:1;min-width:120px}.success-text strong{color:#4ade80;font-size:14px;font-weight:600;display:block}.success-password{letter-spacing:4px;color:var(--text-bright);margin-top:4px;font-family:Courier New,monospace;font-size:22px;font-weight:700}.next-level-btn{background:var(--accent);color:#fff;cursor:pointer;font-size:14px;font-weight:600;font-family:var(--sans);white-space:nowrap;border:none;border-radius:8px;flex-shrink:0;padding:9px 18px;transition:background .2s,transform .1s}.next-level-btn:hover{background:#6354e0;transform:scale(1.03)}.next-level-btn:active{transform:scale(.97)}.final-message{color:var(--text-dim);width:100%;margin-top:6px;font-size:13px}