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var(--border-default);box-shadow:var(--shadow-md);z-index:4;border-radius:12px;flex-direction:column;align-items:center;gap:6px;padding:8px;display:flex;position:absolute;top:16px;right:16px}.zoom-chip{color:var(--text-secondary);font-family:var(--font-mono);text-align:center;min-width:40px;font-size:11px}.empty-msg{color:var(--text-tertiary);text-align:center;justify-content:center;align-items:center;padding:20px;font-size:14px;font-style:italic;display:flex;position:absolute;inset:0}.player{background:var(--bg-surface);border-top:1px solid var(--border-default);flex-wrap:wrap;align-items:center;gap:16px;padding:12px 20px;display:flex}.progress{background:var(--bg-base);border:1px solid var(--border-default);border-radius:4px;flex:1;min-width:140px;height:6px;overflow:hidden}.progress-fill{background:var(--accent);width:0%;height:100%;transition:width .2s}.speed-wrap{color:var(--text-secondary);font-family:var(--font-mono);align-items:center;gap:8px;font-size:11px;display:flex}.btree-page input[type=range]{accent-color:var(--accent);width:90px}.side-section{border-bottom:1px solid var(--border-subtle);padding:16px 20px}.side-section:last-child{border-bottom:none}.side-title{color:var(--text-primary);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:8px;margin:0 0 12px;font-size:12px;font-weight:600;display:flex}.stats-grid{grid-template-columns:1fr 1fr;gap:8px;display:grid}.stat{background:var(--bg-base);border:1px solid var(--border-subtle);border-radius:10px;padding:12px}.stat .n{color:var(--accent);font-family:var(--font-mono);font-size:18px;font-weight:600;line-height:1.2}.stat .l{color:var(--text-tertiary);margin-top:2px;font-size:11px}.mode-card{background:var(--bg-base);border:1px solid var(--border-default);border-radius:12px;margin-top:10px;padding:12px}.mode-card span{color:var(--accent);font-family:var(--font-mono);text-transform:uppercase;margin-bottom:4px;font-size:11px;font-weight:600;display:block}.mode-card p{color:var(--text-secondary);margin:0;font-size:12px;line-height:1.5}.op-tabs{background:var(--bg-base);border:1px solid var(--border-subtle);border-radius:8px;gap:2px;margin-bottom:12px;padding:2px;display:flex;overflow:hidden}.op-tab{color:var(--text-tertiary);cursor:pointer;font-family:var(--font-mono);letter-spacing:.02em;text-align:center;background:0 0;border-radius:6px;flex:1;padding:10px 4px;font-size:10px;font-weight:500;transition:all .15s}.op-tab.active{background:var(--bg-surface-raised);color:var(--text-primary);box-shadow:var(--shadow-sm);font-weight:600}.pseudo{background:var(--bg-base);border:1px solid var(--border-subtle);color:var(--text-secondary);font-family:var(--font-mono);border-radius:10px;margin:0;padding:12px;font-size:11.5px;line-height:1.7;overflow-x:auto}.pseudo .ln{white-space:pre;border-radius:4px;padding:2px 6px;display:block}.pseudo .ln.active{background:var(--accent-subtle);border-left:2px solid var(--accent);color:var(--text-primary);padding-left:10px}.hint{color:var(--text-secondary);font-size:12px;line-height:1.5}.hint b{color:var(--text-primary)}.kbd{background:var(--bg-base);border:1px solid var(--border-default);font-family:var(--font-mono);border-radius:4px;padding:2px 5px;font-size:10px}.toast{background:var(--text-primary);box-shadow:var(--shadow-lg);color:var(--bg-base);opacity:0;pointer-events:none;z-index:50;border-radius:8px;padding:10px 20px;font-size:13px;font-weight:500;transition:all .2s cubic-bezier(.16,1,.3,1);position:fixed;bottom:24px;left:50%;transform:translate(-50%)translateY(16px)}.toast.show{opacity:1;transform:translate(-50%)translateY(0)}.node-bg{fill:#141418;stroke:var(--border-default);stroke-width:1px;transition:fill .3s,stroke .3s}.node-fold{fill:var(--bg-surface-raised);stroke:var(--border-default);stroke-width:1px}.cell-bg{fill:#0000;stroke:#0000}.cell-div{stroke:var(--border-subtle);stroke-width:1px}.cell-txt{fill:var(--text-primary);font-family:var(--font-mono);pointer-events:none;font-size:14px;font-weight:500}.edge{fill:none;stroke:var(--border-default);stroke-width:1.2px}.leaf-link{fill:none;stroke:var(--accent);stroke-dasharray:4 4;stroke-linecap:round;stroke-width:1.4px;opacity:.6}.node-group{transition:transform .4s cubic-bezier(.16,1,.3,1)}.n-visit .node-bg{fill:#34d39914;stroke:var(--s-visit);stroke-width:1.5px}.n-split-parent .node-bg{fill:#c084fc14;stroke:var(--s-split-parent);stroke-width:1.5px}.n-split-left .node-bg{fill:#38bdf814;stroke:var(--s-split-left);stroke-width:1.5px}.n-split-right .node-bg{fill:#f472b614;stroke:var(--s-split-right);stroke-width:1.5px}.n-merge .node-bg{fill:#facc1514;stroke:var(--s-merge);stroke-width:1.5px}.n-borrow .node-bg{fill:#22d3ee14;stroke:var(--s-borrow);stroke-width:1.5px}.c-insert{fill:#34d39926!important;stroke:var(--s-insert)!important;stroke-width:1.5px!important}.c-delete{fill:#f8717126!important;stroke:var(--s-delete)!important;stroke-width:1.5px!important}.c-replace{fill:#fb923c26!important;stroke:var(--s-replace)!important;stroke-width:1.5px!important}@media (max-width:1024px){.visualizer-layout{grid-template-columns:1fr}.canvas-container{height:520px}}@media (max-width:640px){.btree-page{padding:16px 12px 32px}.btree-header{flex-direction:column;align-items:stretch}.header-actions{justify-content:stretch}.order-select{justify-content:space-between;width:100%}.top-operations{justify-content:stretch}.operation-group{justify-content:space-between;width:100%}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}