:root{--bg: #0f1115;--bg-soft: #16191f;--bg-elev: #1c2029;--border: #262b36;--border-soft: #1f242e;--text: #e6e8ee;--text-dim: #8b93a7;--text-faint: #5d6679;--accent: #4c8dff;--accent-dim: #2f5ea8;--ok: #3fb950;--warn: #d29922;--err: #f85149;--user-bg: #1e2735;--radius: 12px;--tap: 44px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:15px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;overscroll-behavior-y:none}button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}input,textarea{font:inherit;color:inherit}a{color:var(--accent)}.app{display:grid;grid-template-rows:auto 1fr;height:100%;max-height:100dvh}.topbar{display:flex;align-items:center;gap:12px;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--bg-soft);min-height:56px}.topbar h1{font-size:15px;font-weight:600;margin:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.balance-chip{display:inline-flex;align-items:baseline;gap:6px;padding:6px 12px;border-radius:999px;background:var(--bg-elev);border:1px solid var(--border);font-variant-numeric:tabular-nums;font-size:13px}.balance-chip .amount{font-weight:600}.balance-chip .hold{color:var(--text-faint);font-size:11px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:var(--tap);padding:0 16px;border-radius:var(--radius);background:var(--bg-elev);border:1px solid var(--border);color:var(--text);transition:background .12s}.btn:hover:not(:disabled){background:#232834}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:#3b7ae8}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-dim);min-height:36px;padding:0 10px}.btn-ghost:hover:not(:disabled){background:var(--bg-elev);color:var(--text)}.chat-shell{display:grid;grid-template-columns:260px 1fr;min-height:0}.chat-shell.no-sidebar{grid-template-columns:1fr}.sidebar{border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0;background:var(--bg-soft)}.sidebar-head{padding:12px;border-bottom:1px solid var(--border-soft)}.dialog-list{flex:1;overflow-y:auto;padding:8px}.dialog-item{display:block;width:100%;text-align:left;padding:10px 12px;border-radius:10px;margin-bottom:2px;color:var(--text-dim)}.dialog-item:hover{background:var(--bg-elev)}.dialog-item.active{background:var(--user-bg);color:var(--text)}.dialog-item .title{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.dialog-item .meta{font-size:11px;color:var(--text-faint);margin-top:2px;display:flex;justify-content:space-between;gap:8px}.messages{overflow-y:auto;padding:20px 16px 8px;display:flex;flex-direction:column;gap:16px;min-height:0}.msg{max-width:780px;width:100%;margin:0 auto}.msg.user{align-self:flex-end}.bubble{min-height:44px;padding:11px 15px;border-radius:var(--radius);background:var(--bg-soft);border:1px solid var(--border-soft);white-space:pre-wrap;overflow-wrap:anywhere}.msg.user .bubble{background:var(--user-bg);border-color:#2a3648}.msg-foot{display:flex;gap:10px;align-items:center;font-size:11px;color:var(--text-faint);margin-top:5px;padding:0 4px;font-variant-numeric:tabular-nums}.thinking{display:inline-flex;align-items:center;gap:8px;color:var(--text-faint);font-size:14px}.thinking .spinner{width:14px;height:14px;flex:0 0 auto}.cursor:after{content:"▍";color:var(--accent);animation:blink 1s steps(2) infinite}@keyframes blink{50%{opacity:0}}.composer-wrap{border-top:1px solid var(--border);background:var(--bg-soft);padding:12px 16px calc(12px + env(safe-area-inset-bottom))}.composer{display:flex;gap:10px;align-items:flex-end;max-width:780px;margin:0 auto}.composer textarea{flex:1;resize:none;max-height:200px;min-height:var(--tap);padding:11px 14px;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg);outline:none}.composer textarea:focus{border-color:var(--accent-dim)}.composer-hint{max-width:780px;margin:6px auto 0;font-size:11px;color:var(--text-faint);display:flex;justify-content:space-between;gap:8px}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:grid;place-items:center;padding:16px;z-index:50}.modal{background:var(--bg-soft);border:1px solid var(--border);border-radius:16px;padding:22px;width:min(460px,100%);max-height:85dvh;overflow-y:auto}.modal h2{margin:0 0 16px;font-size:17px}.field{margin-bottom:12px}.field label{display:block;font-size:12px;color:var(--text-dim);margin-bottom:5px}.field input{width:100%;min-height:var(--tap);padding:0 12px;border-radius:10px;border:1px solid var(--border);background:var(--bg);outline:none}.field input:focus{border-color:var(--accent-dim)}.amount-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:12px}.amount-row .btn{padding:0;min-height:40px;font-variant-numeric:tabular-nums}.amount-row .btn.active{border-color:var(--accent);color:var(--accent)}.error-text{color:var(--err);font-size:13px;margin-top:8px}.auth-wrap{min-height:100dvh;display:grid;place-items:center;padding:20px}.auth-card{width:min(400px,100%);background:var(--bg-soft);border:1px solid var(--border);border-radius:18px;padding:28px}.auth-card h1{font-size:21px;margin:0 0 6px}.auth-card .sub{color:var(--text-dim);font-size:13.5px;margin-bottom:22px}.switch-line{margin-top:16px;font-size:13px;color:var(--text-dim);text-align:center}.tier-label{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);margin:16px 0 8px}.model-row{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border-radius:10px;text-align:left;border:1px solid transparent}.model-row:hover{background:var(--bg-elev)}.model-row.selected{border-color:var(--accent);background:#4c8dff14}.model-row .name{flex:1;font-size:14px}.model-row .price{font-size:12px;color:var(--text-dim);font-variant-numeric:tabular-nums;text-align:right}.empty{text-align:center;color:var(--text-faint);padding:60px 20px;font-size:14px}.spinner{width:16px;height:16px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.menu-btn{display:none}@media(max-width:720px){.menu-btn{display:inline-flex}.chat-shell{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 auto 0 0;width:280px;z-index:40;transform:translate(-100%);transition:transform .2s}.sidebar.open{transform:translate(0)}.sidebar-scrim{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;z-index:39}.messages{padding:14px 12px 4px}.topbar{padding:8px 12px}.balance-chip{font-size:12px;padding:5px 10px}}@media(prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}}