:root{--bg: #0f1115;--panel: #171a21;--panel-2: #1d212b;--border: #2a2f3a;--text: #e6e8ee;--muted: #8a93a6;--accent: #6ee7b7;--accent-2: #60a5fa;--accent-muted: #1e3a5f;--user-bubble: #2b3b55;--assistant-bubble: #1f2530;--danger: #f87171}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px}.app{display:grid;grid-template-columns:280px 1fr 320px;grid-template-rows:56px 1fr;height:100vh}.header{grid-column:1 / -1;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--panel);border-bottom:1px solid var(--border)}.header h1{font-size:16px;margin:0}.header .meta{color:var(--muted);font-size:12px}.sidebar{background:var(--panel);border-right:1px solid var(--border);overflow-y:auto;display:flex;flex-direction:column}.sidebar h2{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:16px 16px 8px;flex-shrink:0}.theme-list{display:flex;flex-direction:column;flex-shrink:0}.theme-item{display:flex;align-items:center;gap:10px;padding:10px 16px;cursor:pointer;border-left:3px solid transparent;transition:background .15s}.theme-item:hover{background:var(--panel-2)}.theme-item.active{background:var(--panel-2);border-left-color:var(--accent)}.theme-item .icon{font-size:18px}.history-search-wrap{padding:0 12px 6px;flex-shrink:0}.history-search{width:100%;padding:6px 10px;border-radius:6px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);font-size:12px;outline:none;transition:border-color .15s}.history-search:focus{border-color:var(--accent)}.history-search::placeholder{color:var(--muted)}.history-list{flex:1;overflow-y:auto;padding:0 8px 8px}.history-empty{color:var(--muted);font-size:12px;padding:8px 6px}.history-item{display:flex;align-items:center;justify-content:space-between;padding:7px 8px;border-radius:6px;cursor:pointer;margin-bottom:2px;border:1px solid transparent;transition:background .15s,border-color .15s}.history-item:hover{background:var(--panel-2)}.history-item.active{background:var(--accent-muted);border-color:var(--border)}.history-item-body{overflow:hidden;flex:1}.history-title{font-size:12px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text)}.history-meta{font-size:10px;color:var(--muted);margin-top:2px}.history-delete{background:transparent;border:none;color:var(--muted);cursor:pointer;font-size:16px;line-height:1;padding:0 2px 0 6px;flex-shrink:0;opacity:0;transition:opacity .15s,color .15s}.history-item:hover .history-delete{opacity:1}.history-delete:hover{color:var(--danger)}.main{display:flex;flex-direction:column;overflow:hidden}.controls{display:flex;gap:12px;align-items:center;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border);flex-shrink:0}.controls label{color:var(--muted);font-size:12px}.controls select{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:6px 8px}.controls input[type=checkbox]{accent-color:var(--accent)}.chat{flex:1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:12px}.bubble{max-width:80%;padding:10px 14px;border-radius:10px;white-space:pre-wrap;word-wrap:break-word;line-height:1.45}.bubble.user{align-self:flex-end;background:var(--user-bubble)}.bubble.assistant{align-self:flex-start;background:var(--assistant-bubble);border:1px solid var(--border)}.bubble.system,.bubble.error{align-self:center;background:transparent;color:var(--danger);font-size:12px}.bubble .role{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:4px}.citations{margin-top:8px;font-size:12px;color:var(--muted)}.citation{border-left:2px solid var(--accent-2);padding:4px 0 4px 8px;margin:4px 0}.citation strong{color:var(--text)}.composer{display:flex;gap:8px;padding:12px 16px;background:var(--panel);border-top:1px solid var(--border);flex-shrink:0}.composer textarea{flex:1;resize:none;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:10px 12px;font:inherit;min-height:44px;max-height:200px;outline:none;transition:border-color .15s}.composer textarea:focus{border-color:var(--accent)}.composer button{background:var(--accent);color:#0f1115;border:0;border-radius:8px;padding:0 16px;font-weight:600;cursor:pointer;transition:opacity .15s}.composer button:disabled{opacity:.5;cursor:not-allowed}.right{background:var(--panel);border-left:1px solid var(--border);overflow-y:auto}.right h2{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:16px 16px 8px}.token-badge{display:inline-block;padding:4px 8px;border-radius:999px;background:var(--panel-2);border:1px solid var(--border);font-size:11px;color:var(--muted)}.token-badge.warn{color:#fbbf24;border-color:#92703a}.token-badge.danger{color:var(--danger);border-color:#7a3232}.docs{padding:0 16px 16px}.doc-row{display:flex;align-items:center;justify-content:space-between;padding:6px 8px;border:1px solid var(--border);border-radius:6px;margin-bottom:6px;background:var(--panel-2);font-size:12px}.doc-row .filename{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:200px}.doc-row button{background:transparent;color:var(--danger);border:0;cursor:pointer;padding:2px 6px;font-size:12px}.upload{border:1px dashed var(--border);border-radius:8px;padding:12px;text-align:center;margin-bottom:12px;color:var(--muted);cursor:pointer;transition:border-color .15s,color .15s}.upload:hover{border-color:var(--accent);color:var(--text)}.upload input{display:none}.btn-danger{background:var(--danger);color:#0f1115;border:none;border-radius:6px;padding:8px 16px;cursor:pointer;font-weight:600}.btn-secondary{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:8px 16px;cursor:pointer}.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border);border-radius:6px;padding:6px 10px;cursor:pointer;transition:color .15s,border-color .15s}.btn-ghost:hover{color:var(--text);border-color:var(--muted)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:100}.modal{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:28px 32px;max-width:480px;width:90%}.empty{color:var(--muted);padding:32px;text-align:center}.history-list::-webkit-scrollbar{width:4px}.history-list::-webkit-scrollbar-track{background:transparent}.history-list::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.history-list::-webkit-scrollbar-thumb:hover{background:var(--muted)}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}