:root{--notebook-bg:#ffffff;--notebook-border:rgba(0, 0, 0, 0.1);--notebook-toolbar-bg:#f8f9fa;--notebook-editor-bg:#ffffff;--notebook-text:#1a1a1a;--notebook-text-secondary:#666;--notebook-text-muted:#999;--notebook-accent:#ff8200;--notebook-accent-hover:#e67400;--notebook-accent-light:rgba(255, 130, 0, 0.1);--notebook-success:#28c76f;--notebook-error:#ea5455;--notebook-shadow:0 20px 60px rgba(0, 0, 0, 0.15);--notebook-radius:24px;--notebook-radius-sm:12px;--notebook-transition:0.2s ease}body.dark-mode{--notebook-bg:#1e1e1e;--notebook-border:rgba(255, 255, 255, 0.1);--notebook-toolbar-bg:#2a2a2a;--notebook-editor-bg:#252525;--notebook-text:#f0f0f0;--notebook-text-secondary:#aaa;--notebook-text-muted:#777;--notebook-shadow:0 20px 60px rgba(0, 0, 0, 0.4)}.notebook-modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:10000;opacity:0;visibility:hidden;transition:opacity .25s,visibility 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var(--notebook-transition);z-index:10}.notebook-close-btn:hover{background:var(--notebook-accent-light);color:var(--notebook-accent)}body.dark-mode .notebook-close-btn{background:rgba(255,255,255,.1)}.notebook-header{padding:24px 60px 16px 24px;border-bottom:1px solid var(--notebook-border)}.notebook-title-section{display:flex;align-items:center;gap:12px}.notebook-icon{font-size:24px;color:var(--notebook-accent)}.notebook-title-input{flex:1;border:none;background:0 0;font-family:Manrope,sans-serif;font-size:1.5rem;font-weight:700;color:var(--notebook-text);outline:0;padding:4px 0}.notebook-title-input::placeholder{color:var(--notebook-text-muted)}.notebook-meta{display:flex;align-items:center;gap:16px;margin-top:8px;padding-left:36px}.notebook-date{font-size:12px;color:var(--notebook-text-muted)}.notebook-link{display:inline-flex;align-items:center;gap:6px;padding:4px 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code{background:rgba(255,255,255,.1)}.notebook-editor hr{height:2px;background:var(--notebook-border)}.notebook-editor .checkbox-item{display:flex;align-items:flex-start;gap:8px;margin:.5em 0}.notebook-editor .checkbox-item input[type=checkbox]{width:18px;height:18px;margin-top:2px;accent-color:var(--notebook-accent);cursor:var(--f-cursor-pointer)}.ai-input-overlay{position:absolute;background:var(--notebook-bg);border:2px solid var(--notebook-accent);border-radius:16px;padding:12px;box-shadow:0 8px 32px rgba(0,0,0,.15);z-index:100;animation:.2s aiOverlayIn}@keyframes aiOverlayIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.ai-input-container{display:flex;align-items:center;gap:8px}.ai-sparkle-indicator{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#7c3aed,#a855f7);border-radius:50%;color:#fff;font-size:14px;animation:1.5s ease-in-out infinite sparkle}@keyframes 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12px;background:rgba(255,255,255,.2);border:none;border-radius:15px;color:#fff;font-size:12px;font-weight:600;cursor:var(--f-cursor-pointer);transition:background var(--notebook-transition)}.ai-stop-btn:hover{background:rgba(255,255,255,.3)}.notebook-footer{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-top:1px solid var(--notebook-border);background:var(--notebook-toolbar-bg)}.notebook-status{display:flex;align-items:center;gap:16px}.save-status{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--notebook-success)}.save-status.saving{color:var(--notebook-accent)}.save-status.error{color:var(--notebook-error)}.word-count{font-size:12px;color:var(--notebook-text-muted)}.notebook-manage-link{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:rgba(255,130,0,.1);border-radius:20px;font-size:12px;font-weight:600;color:var(--notebook-accent);text-decoration:none;transition:all 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8px;background:var(--notebook-accent-light);border-radius:12px;font-size:10px;font-weight:600;color:var(--notebook-accent)}.notebook-card-actions{display:flex;gap:8px;margin-top:12px;padding-top:12px;border-top:1px solid var(--notebook-border)}.notebook-card-action{flex:1;padding:8px;background:0 0;border:none;border-radius:8px;font-size:12px;color:var(--notebook-text-secondary);cursor:var(--f-cursor-pointer);display:flex;align-items:center;justify-content:center;gap:6px;transition:all var(--notebook-transition)}.notebook-card-action:hover{background:rgba(0,0,0,.05);color:var(--notebook-text)}body.dark-mode .notebook-card-action:hover{background:rgba(255,255,255,.08)}.notebook-card-action.delete:hover{background:rgba(234,84,85,.1);color:var(--notebook-error)}.notebooks-empty{text-align:center;padding:60px 24px;color:var(--notebook-text-muted)}.notebooks-empty i{font-size:48px;margin-bottom:16px;opacity:.5}.notebooks-empty p{font-size:16px;margin:0 0 8px}.notebooks-empty span{font-size:14px}.cloud-sync-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;background:linear-gradient(135deg,#3b82f6,#2563eb);border-radius:20px;font-size:11px;font-weight:600;color:#fff}.cloud-sync-badge i{font-size:10px}.notebook-editor.view-mode{cursor:var(--f-cursor-default);background:0 0}.notebook-editor.view-mode:focus{outline:0}.notebook-editor pre{background:#1e1e1e;border-radius:8px;padding:16px;overflow-x:auto;margin:16px 0}.notebook-editor pre code{background:0 0;padding:0;font-family:'JetBrains Mono','Fira Code',Consolas,monospace;font-size:13px;line-height:1.5;color:#d4d4d4}body.dark-mode .notebook-editor pre{background:#0d1117}.notebook-editor .math-inline{padding:0 4px;color:var(--notebook-accent)}.notebook-editor .katex-display{margin:16px 0;padding:16px;background:rgba(0,0,0,.02);border-radius:8px;overflow-x:auto}body.dark-mode .notebook-editor .katex-display{background:rgba(255,255,255,.03)}.notebook-editor .katex{font-size:1.1em}.notebook-editor img{max-width:100%;height:auto;border-radius:8px;margin:12px 0}.notebook-editor .file-attachment{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;background:rgba(0,0,0,.05);border-radius:8px;font-size:13px;color:var(--notebook-text);margin:8px 0}.notebook-editor .file-attachment i{color:var(--notebook-accent)}body.dark-mode .notebook-editor .file-attachment{background:rgba(255,255,255,.08)}.notebook-editor blockquote{border-left:4px solid var(--notebook-accent);margin:16px 0;padding:12px 20px;background:rgba(255,130,0,.05);border-radius:0 8px 8px 0;font-style:italic}body.dark-mode .notebook-editor blockquote{background:rgba(255,130,0,.08)}.notebook-editor input[type=checkbox]{width:18px;height:18px;margin-right:8px;accent-color:var(--notebook-accent)}.notebook-editor a{color:var(--notebook-accent);text-decoration:none}.notebook-editor a:hover{text-decoration:underline}.notebook-editor hr{border:none;border-top:2px solid rgba(0,0,0,.1);margin:24px 0}body.dark-mode .notebook-editor hr{border-top-color:rgba(255,255,255,.1)}