:root{--nh-navy: #2e3c5a;--nh-teal: #70bdc3;--nh-sage: #7ebe9a;--nh-grad-from: #10bcd7;--nh-grad-to: #57bf95;--nh-text: #696766;--nh-muted: #898685;--nh-edge: #e0e0e0;--nh-line: #f0f0f0;--nh-fill: #fafafa;--nh-paper: #ffffff;--nh-bg: #f5f5f5;--nh-success: #52c41a;--nh-success-bg: #f6ffed;--nh-error: #f5222d;--nh-error-bg: #fff2f0;--nh-warning: #faad14;--nh-warning-bg: #fffbe6;--nh-info: #1677ff;--nh-info-bg: #e6f4ff;--nh-info-edge: #91caff;--bg-page: var(--nh-bg);--bg-card: var(--nh-paper);--bg-input: var(--nh-paper);--bg-user-bubble: var(--nh-navy);--bg-ai-bubble: var(--nh-paper);--bg-header: var(--nh-paper);--bg-sidebar: var(--nh-paper);--bg-code: var(--nh-fill);--bg-table-head: var(--nh-navy);--bg-table-stripe: var(--nh-fill);--bg-export-chip: rgba(112, 189, 195, .12);--text-primary: var(--nh-navy);--text-body: var(--nh-text);--text-muted: var(--nh-muted);--text-on-dark: #ffffff;--text-code: #1a1a2e;--border: var(--nh-edge);--border-input: #d9d9d9;--border-focus: var(--nh-teal);--accent: var(--nh-teal);--accent-hover: #5dadb3;--shadow-card: 0 -1px 7px rgba(0, 0, 0, .16);--shadow-hover: 0 4px 16px rgba(0, 0, 0, .1);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 10px;--radius-pill: 999px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;--font-mono: ui-monospace, "Cascadia Code", "Menlo", "Monaco", "Consolas", monospace}[data-theme=dark]{--bg-page: #151d2e;--bg-card: #1e293b;--bg-input: #1a2438;--bg-user-bubble: #243450;--bg-ai-bubble: #1e293b;--bg-header: #1a2236;--bg-sidebar: #1a2236;--bg-code: #141e2f;--bg-table-head: #243450;--bg-table-stripe: #1a2438;--bg-export-chip: rgba(112, 189, 195, .18);--text-primary: #e2e8f0;--text-body: #b8c4d4;--text-muted: #7a8ba3;--text-on-dark: #e2e8f0;--text-code: #c9d1e0;--border: #2d3f58;--border-input: #3a4a65;--border-focus: var(--nh-teal);--accent: #70bdc3;--accent-hover: #8ccdd3;--shadow-card: 0 -1px 7px rgba(0, 0, 0, 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16px;text-align:center;font-size:12px;color:var(--text-muted);line-height:1.6}.export-item{padding:12px 14px;border-bottom:1px solid var(--border);transition:background .1s}.export-item:hover{background:var(--bg-input)}.export-item:last-child{border-bottom:none}.export-item-name{font-size:12px;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:2px}.export-item-meta{font-size:11px;color:var(--text-muted);margin-bottom:6px}.export-item-actions{display:flex;align-items:center;gap:6px}.export-item-download{display:inline-flex;align-items:center;gap:4px;font-size:11px;color:var(--accent);text-decoration:none;padding:3px 10px;border:1px solid var(--accent);border-radius:var(--radius-pill);font-weight:500;transition:background .12s}.export-item-download:hover{background:var(--bg-export-chip)}.export-item-del{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;background:transparent;border:1px solid var(--border);border-radius:var(--radius-pill);color:var(--text-muted);font-size:14px;line-height:1;cursor:pointer;padding:0;transition:border-color .12s,color .12s}.export-item-del:hover{border-color:var(--nh-error);color:var(--nh-error)}.chat-footer{padding:14px 24px 18px;border-top:1px solid var(--border);background:var(--bg-header);flex-shrink:0}.input-wrapper{display:flex;align-items:flex-end;gap:8px;position:relative}.mention-dropdown{position:absolute;bottom:calc(100% + 8px);left:0;right:52px;max-height:240px;overflow-y:auto;margin:0;padding:4px;list-style:none;background:var(--bg-ai-bubble);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-card);z-index:20}.mention-hint{padding:5px 10px 6px;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.6px;color:var(--text-muted)}.mention-item{display:flex;align-items:center;gap:4px;padding:7px 10px;border-radius:var(--radius-sm, 6px);font-size:13px;color:var(--text-body);cursor:pointer}.mention-item.active{background:var(--bg-export-chip);color:var(--text-primary)}.mention-at{color:var(--accent);font-weight:600}.chip-schema-badge{display:inline-block;padding:1px 7px;margin:0 1px;border-radius:999px;background:var(--bg-export-chip);border:1px solid var(--border);color:var(--accent);font-size:12px;font-weight:600;vertical-align:baseline}.chip-schema-badge:before{content:"@";opacity:.7}.message-input{flex:1;padding:11px 14px;border:1px solid var(--border-input);border-radius:var(--radius-md);background:var(--bg-input);color:var(--text-body);font-family:var(--font-family);font-size:14px;line-height:1.55;resize:vertical;min-height:52px;max-height:200px;transition:border-color .15s,box-shadow .15s;outline:none}.message-input::placeholder{color:var(--text-muted)}.message-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 2px #70bdc32e}.message-input:disabled{opacity:.6;cursor:not-allowed;resize:none}.mic-btn,.send-btn{width:42px;height:42px;border-radius:var(--radius-pill);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s,transform .1s}.send-btn{background:var(--accent)}.send-btn:hover:not(:disabled){background:var(--accent-hover);transform:scale(1.04)}.send-btn:active:not(:disabled){transform:scale(.97)}.send-btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.mic-btn{background:var(--bg-card);border:1px solid var(--border);color:var(--text-muted)}.mic-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent);transform:scale(1.04)}.mic-btn.recording{background:#e53e3e;border-color:#e53e3e;color:#fff;animation:mic-pulse 1.2s ease-in-out infinite}@keyframes mic-pulse{0%,to{box-shadow:0 0 #e53e3e80}50%{box-shadow:0 0 0 8px #e53e3e00}}.input-hint{margin-top:6px;font-size:11px;color:var(--text-muted)}.welcome-bubble{max-width:680px}.welcome-header{display:flex;align-items:flex-start;gap:14px}.welcome-title{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:4px}.welcome-subtitle{font-size:13px;color:var(--text-body);line-height:1.6}.welcome-tips{display:flex;flex-direction:column;gap:8px;padding:14px 16px;background:var(--bg-page);border-radius:var(--radius-md);border:1px solid var(--border)}.welcome-tip{display:flex;align-items:baseline;gap:8px;font-size:13px;color:var(--text-body);line-height:1.5}.tip-icon{font-size:14px;flex-shrink:0}.welcome-tip strong{color:var(--text-primary)}.welcome-example-group{display:flex;flex-direction:column;gap:6px}.welcome-examples-label{display:flex;align-items:center;gap:5px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.6px;color:var(--text-muted)}.welcome-examples-label .tip-icon{font-size:12px}.welcome-examples{display:flex;flex-direction:column;gap:6px}.example-chip{display:block;width:100%;text-align:left;padding:9px 14px;background:var(--bg-page);border:1px solid var(--border);border-radius:var(--radius-md);font-family:var(--font-family);font-size:13px;color:var(--text-body);cursor:pointer;transition:border-color .12s,background .12s,color .12s;line-height:1.4}.example-chip:hover{border-color:var(--accent);background:var(--bg-export-chip);color:var(--text-primary)}.alert-error{padding:10px 14px;background:var(--nh-error-bg);border:1px solid rgba(245,34,45,.3);border-radius:var(--radius-md);font-size:13px;color:var(--nh-error)}@media(max-width:768px){.conversations-panel,.exports-panel{display:none}.chat-area{padding:16px}.bubble.ai{max-width:100%}.bubble.user{max-width:86%}.chat-footer{padding:12px 16px 16px}}